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Stack #2761277
| Question | Answer |
|---|---|
| In a centrifugal pump, internal leakage is prevented by ________. A ) Lantern rings B ) Wear ring C ) Flex coupling D ) Volute | B ) Wear ring |
| Pump and motor shaft wear is caused by ___________. A ) Discharge pressure too high B ) Misalignment between pump and motor flanges C ) Worn out seal D ) None of the above | B ) Misalignment between pump and motor flanges |
| How many gallons of wastewater would 400 feet of 2 inch pipe hold? A ) 59.0 gallons B ) 65.5 gallons C ) 70.5 gallons D ) 75.0 gallons | B ) 65.5 gallons |
| What is 74% of 670? A ) 496 B ) 49.6 C ) 525 D ) 52.5 | A ) 496 |
| The amperometric titration method is used to measure _________. A ) Chlorine Residual B ) pH C ) Total Hardness D ) Alkalinity | A ) Chlorine Residual |
| In an activated sludge plant the effluent from an aeration basin consist of suspended material containing large populations of organisms and very little BOD the effluent is called _______. A ) Influent B ) Total liquor C ) Mixed liquor D ) Ac | C ) Mixed liquor |
| The quantity of volatile solids in the content of the sludge is an indirect measure of the ________. A ) Amount of the sample that will evaporate upon standing. B ) "food" available for the bacteria in the digester. C ) Number of bacteria in the | B ) "food" available for the bacteria in the digester. |
| The trickling filter removes BOD by ________. A ) Filtration B ) Organics trickle down to the media under drain where the micro activity actually takes place C ) Biological contact throughout the media D ) Ion exchange | C ) Biological contact throughout the media |
| A 48-in. diameter pipe is flowing at a rate of 8.5 ft/sec. What is the flow in cu ft/sec? A ) 17.86 B ) 35.71 C ) 106.76 D ) 521.2 | C ) 106.76 |
| The evaporation from plants is called ________. A ) Transpiration B ) Evaporation C ) Precipitation D ) Percolation | A ) Transpiration |
| ___________ are well suited for use in nitrification due to the long aeration time for the mixed liquor and the long sludge age maintained. A ) Extended aeration facilities B ) Complete mix facilities C ) Step feed aeration facilities D ) All | A ) Extended aeration facilities |
| Which parameters are used by municipal sewer authorities to bill industrial users? A ) Temperature, conductivity and solids B ) BOD, lead, copper, volatile solids C ) Copper, chromium, nickel, lead D ) BOD, D.O., conductivity E ) Flow, BOD | E ) Flow, BOD, pH, TSS |
| If a chemical costs $30.00 per ton, how much will it cost per year to treat a flow of 1.5 mgd if the average dose is 18 mg/l? A ) $803 B ) $1110 C ) $1233 D ) $1506 | C ) $1233 |
| Sludge age is one of the methods used by operators to determine and maintain the desired amount of activated sludge solids in the aeration tank. Sludge age considers two factors vital to successful operation. They are ________. A ) Solids entering the | C ) Solids entering the treatment process and solids available to treat the incoming wastes |
| Which safety equipment is not required when handling caustic soda powder? A ) Rubber boots B ) Short sleeved shirt C ) Safety glasses D ) Rubber gloves E ) Face shield | B ) Short sleeved shirt |
| Eventually the layer of organisms on the media of a trickling filter gets so thick that some of it breaks off and is carried into the filter effluent channel. This material is normally called ______. A ) Algae B ) Humus C ) Mixed liquor D ) A | B ) Humus |
| The clarifier influent contains 2.31 mg/l Cr+6 with effluent concentration of 0.18 mg/l Cr+6. Determine the efficiency of the clarifier. A ) 90% B ) 92% C ) 94% D ) 96% | B ) 92% |
| The recovery of raw materials and recycling of waste are the objectives of which EPA regulation? A ) Resource Conservation and Recovery Act B ) Recycling Chemicals through Recovery Act C ) Reduction of Chemical Resources and Accumulation D ) | A ) Resource Conservation and Recovery Act |
| Determine the minutes required to fill a tank 12 feet deep, 8 feet wide and 8 feet long if the pump is pumping at a rate of 215 GPM. A ) 22 minutes B ) 27 minutes C ) 32 minutes D ) 37 minutes | B ) 27 minutes |
| The ability of water to hold or contain dissolved oxygen is _______. A ) Decreased as the temperature rises B ) Increased as the water temperature rises C ) Is the same regardless of water temperature D ) Varies with the Hydrogen content of w | A ) Decreased as the temperature rises |
| Which device is the simplest form of flow measurement? A ) Weir B ) Flume C ) Magnetic D ) Diaphragm | A ) Weir |
| Always pour acid into water. A ) True B ) False | A ) True |
| What test is not run on the influent sample of a wastewater treatment plant? A ) BOD B ) Fecal Coliform. C ) Suspended Solids. D ) pH | B ) Fecal Coliform. |
| Luxury uptake of phosphorus is a modification of the basic ________. A ) Activated sludge treatment process B ) Fixed growth treatment process C ) RBC systems D ) All of the above | A ) Activated sludge treatment process |
| NPDES permits require monitoring by grab samples for which one of the following parameters? A ) Phosphorous B ) BOD C ) pH D ) TSS E ) TVSS | C ) pH |
| Who issues the NPDES permits? A ) EPA B ) The municipality C ) SCDHEC D ) OSHA | C ) SCDHEC |
| A pump that operates by driving a piston up and down is called a _______. A ) Centrifugal Pump B ) Reciprocating Pump C ) Diaphragm Pump D ) None of the above | B ) Reciprocating Pump |
| The aeration tank distribution system consists of numerous ___________ attached to the bottom of air ____________? A ) Headers - diffusers B ) Diffusers - headers C ) Lines - bubbles D ) Blowers - headers | B ) Diffusers - headers |
| Organic chemistry is concerned with compounds containing the element _____. A ) Iron B ) Methane C ) Phosphorous D ) Carbon | D ) Carbon |
| The most important part of a wastewater treatment plant system is _______. A ) The plant design B ) The supervisors C ) The operators D ) All of the above | C ) The operators |
| The chlorine dosage at a treatment plant is 7 mg/l and the flow rate is 35,000 gpd. How many pounds of HTH at 65% available chlorine will it take to satisfy the disinfection requirements? A ) 2.7 pounds B ) 3.14 pounds C ) 6.28 pounds D ) 9.3 | B ) 3.14 pounds |
| Determine the F/M ratio with a COD of 150 mg/l applied to aeration tank, an influent flow of 7.65 mgd and 41,200 lbs. of solids under aeration, 75% of the MLSS are volatile solids (matter). A ) 0.24 lbs. B ) 0.27 lbs. C ) 0.29 lbs. D ) 0.31 | D ) 0.31 lbs. |
| The main purpose of a jar test is to determine the best ________. A ) Chlorine Residual B ) Chlorine Demand C ) Coagulation Dosage D ) Particulate settling rate | C ) Coagulation Dosage |
| Excessive current flow to a motor is caused by ________. A ) Low voltage B ) Bad motor bearings C ) Poor connections D ) All of the above | B ) Bad motor bearings |
| If a plant influent contains 26.3 pounds of dissolved solids, and the flow is 3.76 MG, what concentration of Alum is required to treat the stream? (Assume 100% removal efficiency and chemical activity; that is, one part of Alum removes one part dissolved | A ) 0.83 mg/l |
| Who are you not required to give access to for the purpose of reviewing DHEC reports and records at your plant? A ) The regional administrator of EPA B ) The director of operations C ) DHEC inspection officials D ) POTW inspection and monitor | E ) The news media |
| Calculate the volume in gallons of a clarifier with a length of 60ft, a width of 30ft and a depth of 12ft with a 18inch freeboard. A ) 18,900 gallons B ) 21,600 gallons C ) 141,372 gallons D ) 161,368 gallons | C ) 141,372 gallons |
| Which of the following compounds is identified by a Rotten Egg odor? A ) Hydrogen Sulfide B ) Aluminum Sulfate C ) Ferric Chloride D ) Iron Oxide | A ) Hydrogen Sulfide |
| Both aerobic and anaerobic sludge digestion processes produce stabilized or digested solids that must be disposed of in the environment. Method of disposal would include __________. A ) Composting with another material B ) Farm land application C | D ) All of the above |
| Calculate the surface area of an equalization basin 98 feet in diameter and 18 feet deep. A ) 7359 square feet B ) 7539 square feet C ) 7759 square feet D ) 7935 square feet | B ) 7539 square feet |
| If the sewer rate is $8.50 for the first 500 cuft and all wastewater generated over the minimum is billed at the rate of $0.50 per 100 cuft, how much would a customer generating 1,200 cuft be billed? A ) $5.25 B ) $6.25 C ) $7.25 D ) $12.00 | D ) $12.00 |
| The normal detention time in a clarifier should be about ______. A ) 1.0 hours B ) 2.0 hours C ) 3.0 hours D ) 4.0 hours | B ) 2.0 hours |
| Worn sprockets are associated with a _________. A ) Rectangular clarifier B ) Aeration basin C ) Contact chamber D ) Rapid sand filter | A ) Rectangular clarifier |
| Three types of waterborne diseases are ________. A ) Mumps, measles and colds B ) Scarlet fever, pneumonia and hay fever C ) Typhoid fever, dysentery and cholera D ) TB, diphtheria and chicken pox | C ) Typhoid fever, dysentery and cholera |
| What is the mean cell residence time with an aerator volume of 1 mgd, the final clarifier volume is 500,000 gallons and the wastewater flow to the aerator is 4 mgd. The waste sludge flow for the past 24 hours was .075 mgd, the mixed liquor concentration i | B ) 4.7 days |
| If an operator starts the week with 86 pounds of dry polymer and uses 58.5 pounds, what percent was consumed? A ) 58% B ) 62% C ) 68% D ) None of the above | C ) 68% |
| Biological denitrification is the process by which microorganisms reduce nitrate to _______ gas that is released to the atmosphere. A ) carbon dioxide B ) nitrous oxide C ) nitrogen D ) nitrogen dioxide | C ) nitrogen |
| When mixed with air, in the proper proportions, anaerobic digested gas is extremely ______. A ) Acidic B ) Explosive C ) Nasty D ) Infectious | B ) Explosive |
| A chain of custody record kept in a laboratory is used for ________. A ) Sample tracking B ) To secure the sample C ) Check the lab procedure D ) Document result of sample | A ) Sample tracking |
| How many hours of training must an operator in SC receive in a two-year period in order to maintain certification? A ) Forty (40) B ) Six (6) C ) Twenty-one (21) D ) None, four CEU's are required E ) Twelve (12) | E ) Twelve (12) |
| Determine the volume of a reaction tank that is 24 feet long, 11 feet wide and 5 feet deep. A ) 1320 cubic feet B ) 1320 square feet C ) 1560 cubic feet D ) 1560 square feet | A ) 1320 cubic feet |
| Which indicates a good quality domestic activated sludge? A ) Black color and septic odor. B ) Brown color and musty odor. C ) Brown color and lots of dark brown foam. D ) Settleability of 900 ml in a 1 liter cylinder over a 30 minute period. | B ) Brown color and musty odor. |
| The main difference between biological treatment using a RBC over a trickling filter is that ______. A ) The media is introduced to the wastewater instead of the wastewater introduced to the media B ) The wastewater is introduced to the media inste | A ) The media is introduced to the wastewater instead of the wastewater introduced to the media |
| The oxygen transfer efficiency ___________ as the mechanical aerator submerges. A ) Increases B ) Decreases C ) Remains the same D ) Dependent on motor speed | A ) Increases |
| One ml is what fraction of a liter? A ) 1/10 B ) 1/100 C ) 1/1000 D ) 1/100,000 | C ) 1/1000 |
| What should be the waste sludge pumping rate (gpm) if a plant should be wasting 3,000 pounds per day and the concentration of return sludge is 6,000 mg/l? A ) 0.06 gpm B ) 41.7 gpm C ) 0.55 gpm D ) 55.6 gpm | B ) 41.7 gpm |
| Certification of the laboratory is required before the department will accept analytical data for any parameter required by __________. A ) State safe drinking water act and regulation B ) State pollution control act and regulation C ) State sol | E ) All of the above |
| Bearing temperature exceeding 160 degrees F on a centrifugal pump may indicate ______. A ) Over lubrication B ) Start of bearing failure C ) Under lubrication D ) All of the above | D ) All of the above |
| What is the probable cause if thick billows of white sudsy foam on aeration tank is observed? A ) MLSS to low B ) Inadequate aeration C ) MCRT too low D ) All of the above | A ) MLSS to low |
| Getting the facts is the first step in what part of the process? A ) problem definition B ) problem analysis C ) development of alternatives D ) selection of alternatives | B ) problem analysis |
| Free available chlorine residual is the _______. A ) Amount of chlorine in the water B ) Amount of chlorine applied as measured in mg/l C ) Amount of chlorine in raw wastewater as it comes into the plant D ) Amount of uncombined chlorine that | D ) Amount of uncombined chlorine that remains after the chlorine has been applied and allowed to react. |
| Aluminum Sulfate is used for a standard for the residual chlorine test. A ) True B ) False | B ) False |
| The influent to a circular clarifier solid level is 386 mg/l and the effluent of the same clarifier is 190 mg/l. What is the removal efficiency of this clarifier. A ) 5.1% B ) .507% C ) 51% D ) 45% | C ) 51% |
| Chlorine sample must be analyzed within ______ minutes after collection. A ) 5 B ) 10 C ) 15 D ) 30 | C ) 15 |
| The five-stage Bardenpho process is used to remove both ________ and _________. A ) nitrogen, phosphorus B ) nitrogen, ammonia C ) phosphorus, carbon dioxide D ) carbon dioxide, BOD | A ) nitrogen, phosphorus |
| An active sludge in the aeration tank with an abundant available food supply will have a relatively __________. A ) High oxygen uptake and fast settling rate. B ) High oxygen uptake and slow settling rate. C ) Low oxygen uptake and fast settling | B ) High oxygen uptake and slow settling rate. |
| A single-piston reciprocating pump has a 9" diameter piston with a 6" length of stroke. If it makes 26 discharge strokes per minute, the pumping rate is ______gpm. A ) 6 B ) 12 C ) 25 D ) 43 | D ) 43 |
| The media of a trickling filter provides a large surface area upon which a biological slime growth develops. This slime growth is commonly called _______. A ) Biological slime B ) Activated sludge C ) Biosolids D ) Zoogleal mass | D ) Zoogleal mass |
| What is the most important item to check before starting a gasoline engine? A ) Check the gas level B ) Check the oil level C ) Check the spark plug for proper gap D ) Check the starter | B ) Check the oil level |
| Which chemical would be used to lower the pH of wastewater? A ) Calcium Hydroxide B ) Caustic Soda C ) Sulfuric Acid D ) Sodium Hydroxide | C ) Sulfuric Acid |
| Acids and bases can safely be mixed together. A ) True B ) False | B ) False |
| What is the permitting system used by DHEC to issue authority in allowing discharge of pollutants to streams and rivers? A ) USDA B ) Sara Title III C ) TCLP D ) NPDES E ) MSDS | D ) NPDES |
| Management by objectives means management by results, or when targets are set by the employees and then the results are evaluated by the employees. A ) true B ) false | A ) true |
| When transferring the pH electrode from one buffer to another, the electrode must be _______. A ) Wiped with a cloth or paper towel B ) Rinsed with deionized or distilled water C ) Rinsed with the buffer presently being utilized D ) Rinsed wi | B ) Rinsed with deionized or distilled water |
| The sludge concentration in the return sludge is low what would be the proper solution to the problem? A ) Increase return sludge rate B ) Waste less sludge C ) Increase sludge wasting D ) Reduce sludge return rate | D ) Reduce sludge return rate |
| Determine the mean average of 15C, 36C, 0C, 51C and 14C. A ) 23.2 C B ) 27.0 C C ) 29.0 C D ) 29.5 C | A ) 23.2 C |
| The state laboratory certification program is directed by ____________. A ) EPA B ) S.C. Department of Labor C ) S.C.D.H.E.C. D ) LLR | C ) S.C.D.H.E.C. |
| Your pump ran continuously for 26 hours and delivered 324,762 gallons. The capacity of the pump is ________gpm. A ) 103 B ) 208 C ) 1,018 D ) 12,000 | B ) 208 |
| Calculate the sludge age for an activated sludge process if the aerator volume is 1.0 mg and the MLSS concentration is 2200 mg/l. the influent flow is 4.3 MGD, and the primary effluent suspended solids concentration is 85 mg/l? A ) 2.75 Days B ) 3. | D ) 6.02 Days |
| Determine the pounds of Cu in an equalization Basin that contains 1.02 million gallons and the concentration of Cu is 8.3 mg/l. A ) 63 pounds B ) 71 pounds C ) 79 pounds D ) 87 pounds | B ) 71 pounds |
| Protection of groundwater from chemical contamination is regulated in which law? A ) RCRA B ) MSDS C ) NPDES D ) Right-to-know E ) SCECB | A ) RCRA |
| What is the most likely cause of the activated sludge diffused aeration system problem? data: >blower air output rate high. >organic load normal, hydraulic load normal. >borderline low D.O., low turbulence thru aeration basin. A ) | A ) Aeration system piping leaking |
| The typical growth pattern of bacteria is in four distinct phases. The lag phase is _______. A ) Cells grow in numbers B ) Cells grow in size, not in numbers C ) Population remains constant D ) There are more cells dying than there are multip | B ) Cells grow in size, not in numbers |
| Rising sludge in the secondary clarifier is caused by ________. A ) Bulking B ) Filamentous bacteria C ) Nitrification D ) Denitrification | D ) Denitrification |
| A chemical that liberates positive charged hydrogen ions is an _______. A ) Polymer B ) Flocculant C ) Base D ) Acid | D ) Acid |
| The inlet end of an aeration basin D.O. of 0.2 mg/l, but has an outlet D.O. of 6.1 mg/l. What should you do to increase the inlet D.O.? A ) Chlorinate the influent B ) Throttle back on the air at the end of the header C ) Increase the solids lo | B ) Throttle back on the air at the end of the header |
| A settling basin 60 ft long by 20 ft wide and 8 ft deep is used to treat a flow of 2.1 mgd. What is the detention time? A ) 15 minutes B ) 30 minutes C ) 49 minutes D ) 2.3 hours | C ) 49 minutes |
| What is the major function of cross connection control? A ) To tie different size pipe into a main line B ) Prevent contamination of potable water supplies C ) To increase velocity of incoming influent D ) To assure proper chlorination of eff | B ) Prevent contamination of potable water supplies |
| The time of day when a sample is collected will affect the test sample results. A ) True B ) False | A ) True |
| Two major types of bacteria are present in an anaerobic digester, they are_________. A ) Acid formers and alkaline formers B ) Macro and microorganisms C ) Acid formers and gas formers D ) Gas formers and alkaline formers | C ) Acid formers and gas formers |
| How many training hours does an operator need to maintain the minimum education requirements for the two year period? A ) Four B ) Six C ) eight D ) twelve | D ) twelve |
| Activated sludge plants are capable of BOD and suspended solid removal reductions of ______% to _______%. A ) 60 - 70 % B ) 79 - 85 % C ) 85 - 89 % D ) 90 - 99 % | D ) 90 - 99 % |
| pH buffers must not be used more than __________. A ) Once B ) Twice C ) Four times D ) Can be used until strength of buffer has changed E ) All of the above | A ) Once |
| A pH meter must be calibrated before any analyses are performed. A ) True B ) False | A ) True |
| Which of the following is NOT one of the steps in the decision making process? A ) analyzing the problem B ) define the problem C ) follow up the result D ) note one solution to the problem and implement it | D ) note one solution to the problem and implement it |
| What is the major cause for repeated sludge bulking? A ) High F/M loading rates B ) Low F/M loading rates C ) Reduced detention time D ) Solid shearing | A ) High F/M loading rates |
| Permit requires composite sampling the effluent twice each month. You collect and have tested six composite samples during one month. How do you handle this data? A ) Report the two best sample results but indicate on the DMR that four extra samples | D ) Report all six sample results |
| A tank measures 80 feet long by 30 feet wide by 20 feet deep. If 100,000 gallons of wastewater is being pumped into the tank, how much will the level rise? A ) 5.5 feet B ) 7.5 feet C ) 12 feet D ) 14 feet | A ) 5.5 feet |
| Your wastewater treatment plant serves 1,346 people. The flow averages 89,000 gpd. The approximate daily flow contribution per person is? A ) 14 gpd/cap B ) 66 gpd/cap C ) 80 gpd/cap D ) 140 gpd/cap | B ) 66 gpd/cap |
| Calculate the gallons of industrial wastewater delivered by a pump to a chemical treatment tank if the pumping rate is 74 GPM for 6.5 hours. A ) 20,280 gallons B ) 22,680 gallons C ) 26,860 gallons D ) 28,860 gallons | D ) 28,860 gallons |
| Leadership occurs as a result of _________. A ) supervisory authority and position B ) being born with certain traits C ) the supervisor's ability to achieve employee willingness to follow D ) the number of years on the job | C ) the supervisor's ability to achieve employee willingness to follow |
| Over a 4-year period, the hour meter on an instrument air compressor had the following readings at the end of each year. First year - 976.3 Second year - 1,325.8 Third year - 2,007.1 Fourth year - 2,371.4 How many | C ) 681.3 hours |
| Leakage from a pump packing gland should be approximately ______. A ) No leakage B ) One drop per second C ) One drop per minute D ) 10 Drops per hour | B ) One drop per second |
| The solids that settle out in a clarifier is called _________. A ) Dissolved Solids B ) Colloidal Solids C ) Emulsion D ) Sludge | D ) Sludge |
| Sludge age is an expression of ___________. A ) Pounds of solids added per day per pound of solids maintained in a particular process B ) Is a direct relationship in soluble BOD to solid production C ) Time the solids remain in the activated slu | A ) Pounds of solids added per day per pound of solids maintained in a particular process |
| What is another name for a positive displacement pump? A ) Rotary B ) Jet C ) Centrifugal D ) Turbine | A ) Rotary |
| A wastewater with a pH of 8.3 is basic. A ) True B ) False | A ) True |
| A common coagulant used in the treatment of wastewater is _________. A ) Lime B ) Copper Sulfate C ) Caustic Soda D ) Alum | D ) Alum |
| Which agency classifies wastewater treatment plants in South Carolina? A ) SC Water Pollution Control Authority B ) SC Environmental Certification Board C ) SC Department of Water Resources D ) SC Department of Health and Environmental Contro | D ) SC Department of Health and Environmental Control |
| Buffers should bracket sample values. If not, the instrument must be recalibrated and sample reanalyzed. A ) True B ) False | A ) True |
| Supervisors will have to deal only with educated workers in the future. A ) True B ) False | B ) False |
| Given the following data, calculate the desired pounds of mixed liquor suspended solids (MLSS) in the aeration tank. Data: Primary effluent suspended solids = 120 mg/l Influent flow = 2.0 mgd Desired sludge age = 5.0 | C ) 10,000 lbs |
| Amoeboids predominate in an activated sludge when a plant is ______. A ) Recovering B ) Running well C ) Stable condition D ) None of the above | A ) Recovering |
| How many pounds of nickel is contained in a equalization basin that has a volume of 250,000 gallons and a nickel concentration of 4.4 mg/l? A ) 9.2 lbs B ) 5.5 lbs C ) 14.7 lbs D ) 12.6 lbs | A ) 9.2 lbs |
| How many square feet of media is on a drum screen that has a diameter of 6.5 ft. and a length of 8 feet? A ) 52 B ) 163 C ) 265 D ) 520 | B ) 163 |
| What should be the waste sludge pumping rate if a plant should be wasting 900 pounds per day and the concentration of return sludge is 4,500 mg/l? Select the closest answer. A ) 14 gpm B ) 17 gpm C ) 26 gpm D ) 39 gpm | B ) 17 gpm |
| A minimum of ____ standards and a blank covering the range of the chlorine instruments capabilities must be used to generate each calibration curve. A ) 2 B ) 3 C ) 4 D ) 5 | B ) 3 |
| At the start of every shift, the operator goes through what step or steps? A ) Review the logbook B ) Visually inspect the activated sludge process C ) Review lab results D ) All of the above | D ) All of the above |
| Experimentation is probably the most common method used in managerial problem solving. A ) true B ) false | B ) false |
| What type of aeration method tends to be lower in installation and maintenance costs? A ) Diffused air B ) Mechanical air C ) Pure air systems D ) None of the above | B ) Mechanical air |
| Air filters remove dust and dirt from air before it is compressed and sent to the various plant processes. Type or types of filters may include ________. A ) Bags B ) Oil coated traveling screens C ) Electrostatic precipitators D ) All of the | D ) All of the above |
| If meter is reading 10% less and the recorded reading was 9000 gallons. How much does the company lose when cost is $0.50 per 1000 gallons? A ) $0.90 B ) $0.45 C ) $0.50 D ) $0.25 | C ) $0.50 |
| Three types of diffusers are commonly in use today, they are _______. A ) Cast iron, copper, and lead B ) Small, medium, and large C ) Fine bubble, medium bubble and course bubble D ) Fixed, flex, and removable | C ) Fine bubble, medium bubble and course bubble |
| When organic wastes are discharged to receiving water, oxygen is depleted by ______. A ) Algae during the day B ) Bacteria. C ) Ducks. D ) Limestone rocks. | B ) Bacteria. |
| RCRA states that large quantity generators of hazardous waste cannot store waste on site longer than how many days? A ) 30 B ) 6 months C ) 90 D ) 14 E ) 20 | C ) 90 |
| Compute the lagoon's detention time. Data: Surface area = 12.0 ac Average depth = 3.0 ft Average daily flow (Influent) = 1.02 mgd A ) 3 days B ) 8 days C ) 12 days D ) 29 days | C ) 12 days |
| Most anaerobic digestion tanks are mixed continuously. Why? A ) Bring the food to the organisms B ) To provide a uniform temperature C ) Avoid formation of thick scum blankets D ) All of the above | D ) All of the above |
| The F/M ratio is based upon the food provided each day to the microorganism mass in the aerator. The food provided is preferably measured by the ________ of the influent to the aerator. A ) BOD B ) COD C ) MLSS D ) MLVSS | B ) COD |
| The generally recommended ratio of 5-day BOD to nitrogen to phosphorus for treating wastes is ________ for BOD reduction. A ) 100:1:5 B ) 100:5:1 C ) 1:5:100 D ) 5:1:100 | B ) 100:5:1 |
| he process by which water returns to the atmosphere from the ocean is ______. A ) Transpiration B ) Hydrological Cycle C ) Precipitation D ) Evaporation | D ) Evaporation |
| As the temperature of water increases, the D.O. saturation value increases. A ) True B ) False | B ) False |
| What is the concave area of a liquid in a graduated cylinder called? A ) Break-Point B ) Bubble C ) Meniscus D ) Titrant Curve | C ) Meniscus |
| Microorganisms usually associated with a good quality effluent include _______. A ) Amoebas and Ciliates B ) Ciliates and Rotifers C ) Nacardia and long filaments D ) Rotifers and Flagellates | B ) Ciliates and Rotifers |
| Calculate the pounds of BOD per day entering the trickling filter. Data: Raw wastewater flow = 1.75 mgd Raw wastewater BOD = 185 mg/l There is a 30% reduction in BOD through primary treatment A ) 5 | D ) 1,890 lbs/day |
| Approximately how many gallons would 1200 ft. of 9" pipe hold? A ) 530 B ) 3963 C ) 4678 D ) 5285 | B ) 3963 |
| In most cases, a diaphragm pump is operated by a _________. A ) Electric Motor B ) Vacuum C ) Siphon D ) Air Pressure | A ) Electric Motor |
| An individual wants to feel a part of a group. This is viewed as __________. A ) a social need B ) a self-realization need C ) an esteem need D ) a physiological need | A ) a social need |
| What is the most likely cause of the problem in the primary sedimentation tank? data: >flow thru inlet gates normal >tank level at correct height >sludge collector flights operating normally >scum skimming mechani | C ) Sludge accumulation |
| The typical growth pattern of bacteria is in four distinct phases. The log phase is ______. A ) Cells grow in numbers B ) Cells grow in size, not in numbers C ) Population remains constant D ) There are more cells dying than there are multipl | A ) Cells grow in numbers |
| The ability of water to hold or contain dissolved oxygen is _______. A ) Decreased as the temperature rises B ) Increased as the water temperature rises C ) Is the same regardless of water temperature D ) Varies with the Hydrogen content of w | A ) Decreased as the temperature rises |
| A single-piston reciprocating pump has a 9" diameter piston with a 6" length of stroke. If it makes 26 discharge strokes per minute, the pumping rate is ______gpm. A ) 6 B ) 12 C ) 25 D ) 43 | D ) 43 |
| Calculate the surface area of an equalization basin 98 feet in diameter and 18 feet deep. A ) 7359 square feet B ) 7539 square feet C ) 7759 square feet D ) 7935 square feet | B ) 7539 square feet |
| What agency issues pretreatment permits for industries that discharge into a POTW? A ) The city B ) The SC Environmental Resource Commission C ) The SC league of municipal officials, regulator division D ) The county pollution control board | A ) The city |
| OSHA requires operators to be trained before working with hazardous chemicals in wastewater treatment. When must this training be conducted? A ) OSHA does not require training except for workers that are exposed to hazardous wastes. B ) DHEC and O | E ) After being hired and before employee starts working with hazardous chemicals |
| When working around a blower hearing protection must reduce your noise exposure at least to an eight-hour time-weighted average of _______. A ) 50 decibels B ) 70 decibels C ) 90 decibels D ) 110 decibels | C ) 90 decibels |
| Using digester gases to power equipment for your facility is known as ______. A ) Thermal actuation B ) Heat exchange C ) Cogeneration D ) Incineration | C ) Cogeneration |
| A written record that can be used to trace the possession and handling of samples from the moment of collection through analyses is called? A ) Manifest B ) Chain of custody C ) Tracking papers D ) MSDS | B ) Chain of custody |
| A grab sample is ___________. A ) used to characterize the material at a particular instant in time B ) always associated with instantaneous water and wastewater flow C ) conducted when the water or wastewater stream is not continuous D ) All | D ) All of the above |
| When feeding sludge to a digester, it is best to? A ) Pump small amounts of thick sludge at frequent intervals B ) Pump large amounts of thin sludge at frequent intervals C ) Pump large amounts of thick sludge at frequent intervals D ) Pump s | A ) Pump small amounts of thick sludge at frequent intervals |
| One milligram per liter is equal to ________. A ) 0.001 g/l B ) 1000 ppb C ) I ppm D ) All of the above | D ) All of the above |
| If the lowest chlorine standard used to generate the calibration curve is 0.05 mg/l. The minimum reporting limit is? A ) 0.05 mg/l B ) <0.05 mg/l C ) 0.01 mg/l D ) <0.01 mg/l | B ) <0.05 mg/l |
| If Hydrogen Sulfide is allowed to collect in a sewer line, what conditions would it cause? A ) Explosion hazard B ) Corrosion C ) Methane production D ) No hazard | B ) Corrosion |
| Adequate preparation refers to __________. A ) writing out all messages before delivering them orally B ) reading up on every subject before talking about it C ) clearly organizing your ideas before communicating them D ) repeating your ideas | C ) clearly organizing your ideas before communicating them |
| What is the percent lime mixture if 110 pounds of lime are suspended in 300 gallons of water? A ) 4.4% B ) 24.9% C ) 40% D ) 47% | A ) 4.4% |
| If the final effluent has light, brown transparent, 1/8" balls, what is it called? A ) Colloidal particles B ) Mudballs C ) Pinfloc D ) Straggler floc | D ) Straggler floc |
| A cylindrical tank is 10 feet in diameter and 20 feet in height. What is the approximate capacity in liters? A ) 44,450 B ) 31,030 C ) 8,001 D ) 4,445 | A ) 44,450 |
| Samples that should not be collected as a grab sample unless specified by the NPDES permit are ___________. A ) pH B ) BOD C ) Oil and grease D ) Hexavalent chromium E ) All of the above | B ) BOD |
| All chlorine cylinders are required to contain at least one fusible metal safety device ( plug ) designed to melt at between ______. A ) 158-165 F B ) 100 - 120 F C ) 200 - 212 F D ) 35 - 45 C | A ) 158-165 F |
| Bacteria that produce disease are known as _________. A ) Aerobic Bacteria B ) Anaerobic Bacteria C ) Pathogens D ) Saprophytic | C ) Pathogens |
| In all activated sludge plants wasting must be controlled by the operator. Mixed liquor suspended solids which need to be wasted accumulate from two sources. The first source is the suspended solids in the plant flow from the primary clarifier or raw wast | B ) The new cell production by the microorganisms |
| Which agency regulates safety in wastewater plants in South Carolina? A ) SCECB B ) SCDHPT C ) DOL (LLR) D ) EPA E ) SCDHEC | C ) DOL (LLR) |
| Fire extinguishers and first aid kits should be ________. A ) Locked up to prevent tampering B ) Removed from plant during holidays C ) Located in easy accessible place known by all personnel D ) Used only when permission has been obtained fr | C ) Located in easy accessible place known by all personnel |
| If more than _______ hours elapse, then you should recalibrate your pH meter. A ) 4 hours B ) 8 hours C ) 12 hours D ) 16 hours E ) 24 hours | C ) 12 hours |
| Certification of wastewater treatment plant operators is required by ___________. A ) The SC Municipal Association B ) The EEO Act C ) State law D ) WPCA of SC E ) EPA | C ) State law |
| How would an operator check to see if an impeller is mixing the contents properly in an anaerobic digester? A ) Look in portholes B ) Check rpm C ) Pull samples at various depths D ) Calculate efficiency | C ) Pull samples at various depths |
| The weight of a chemical compound is 1/8 of the total weight of a chemical solution. The percent, by weight, of the chemical in solution is _________. A ) 6.4 B ) 8.3 C ) 10.5 D ) 12.5 | D ) 12.5 |
| What should be the waste sludge pumping rate if a plant should be wasting 1100 pounds per day and the concentration of return sludge is 5,700 mg/l % volatiles are 76. Select the closest answer? A ) 12 gpm B ) 16 gpm C ) 26 gpm D ) 39 gpm | B ) 16 gpm |
| Which chemical would be used to raise the pH of wastewater? A ) Carbon dioxide B ) Sulfur dioxide C ) Flue gases D ) Sodium hydroxide | D ) Sodium hydroxide |
| A person's physiological makeup refers to his __________. A ) income, education, and employment B ) childhood incidents C ) biological composition, such as race or height D ) cultural background | C ) biological composition, such as race or height |
| When checking for voltage or current surge to a motor, the motor should be _______. A ) On B ) Off C ) On or off D ) On single-phase power | A ) On |
| A centrifugal pump that is discharging at a reduced rate should be checked for _______. A ) Worn impeller B ) Blown fuse C ) Higher than normal voltage D ) Lower than normal voltage | A ) Worn impeller |
| Calculate the food-to-microorganism (F:M) loading ratio. Data: Flow = 2 mgd Average BOD to aeration tank = 175 mg/l Aeration tank capacity = 500,000 gallons MLVSS concentration = 2,300 mg/l A ) 0.25 B ) 0.27 C ) 0.30 D ) 0.35 | C ) 0.30 |
| If a treatment plant's Mass Discharge Rate for Copper is set a 3.5 lbs/day, and the maximum treatment efficiency can reach 0.23 ppm Cu concentration in the effluent, how many million gallons per day can be discharged? A ) 0.88 mgd B ) 1.82 mgd C | B ) 1.82 mgd |
| Usually temperature changes in an activated sludge system has little affect unless it raises or lowers the wastewater temperature ________. A ) 10 degrees F B ) 15 degrees F C ) 20 degrees F D ) 25 degrees F | A ) 10 degrees F |
| On the second day of the month a storm started and reached a peak flow of 15 million gallons per day on the third day. The % volatile matter in the aerator suspended solids dropped below 80%. What was done to correct this situation? A ) Waste sludge | B ) Waste sludge rate had to be decreased to maintain the desired pounds of volatile matter until the percent went back up to 80% |
| Suspended solid removal in primary clarification, providing you have the proper detention time, should be about ________. A ) 40 % B ) 50 % C ) 60 % D ) 70 % | C ) 60 % |
| The factor aiding the supervisor in the selection of alternatives which is based on previous, although unremembered experience, is often termed A ) experience B ) advice from others C ) experimentation D ) intuition | D ) intuition |
| Scientific decision-making tends to refer to __________. A ) problem solving in a particular order B ) using computer techniques on quantifiable information C ) experimentation D ) consulting a scientist | B ) using computer techniques on quantifiable information |
| A laboratory will be evaluated for renewal of certification every________. A ) 1 year B ) 2 years C ) 3 years D ) 4 years | C ) 3 years |
| Why should the aerator D.O.be measured in the aeration basin instead of the lab? A ) D.O. of the sample can change very rapidly outside the aerator B ) D.O. does not have to be measured in the aeration basin as long as you can get the sample to the | A ) D.O. of the sample can change very rapidly outside the aerator |
| The discharge from Outfall #001 is 12 MGD. If the discharge pipe is 48 inches in diameter, what is the velocity of the effluent as it enters the receiving stream? A ) 1.48 ft/sec B ) 12.56 ft/sec C ) 18.6 ft/sec D ) 22.55 ft/sec | A ) 1.48 ft/sec |
| What test determines the efficiency of a primary clarifier? A ) Settleable solids B ) pH C ) Conductivity D ) Chlorine | A ) Settleable solids |
| The calibration of a pH meter must be calibrated at __________. A ) one point (7.0) B ) two points C ) three points D ) as many points as possible for good accuracy | B ) two points |
| What effect will the addition of chlorine, acid, alum, carbon dioxide or sulfuric acid have on the pH of wastewater? A ) Neutralize. B ) Lower. C ) Increase. D ) Have no effect. | B ) Lower. |
| In an activated sludge plant, if the influent solids loading increases, the mixed liquor suspended solids may have to be ____________ to treat these wastes by reducing the _________ _________ rate? A ) Increased - Return sludge B ) Decreased - R | C ) Increased - Sludge wasting |
| If 200 gallons of a 6% caustic solution is mixed with 175 gallons of a 8% solution, what is the resulting percent caustic concentration? A ) 6.9% B ) 7% C ) 7.7% D ) 7.9% | A ) 6.9% |
| A rotating biological contactor treats a flow of 2.2 mgd with a soluble BOD of 110 mg/l. The surface area of the media is 550,000 sqft. What is the organic loading? A ) 2.7 lbs BOD/day/1000 sqft B ) 3.0 lbs BOD/day/1000 sqft C ) 3.5 lbs BOD/day/ | D ) 3.7 lbs BOD/day/1000 sqft |
| Find the gallon capacity of a circular tank 40 feet in diameter and 10 feet deep. A ) 93,949 gallons B ) 9,394 gallons C ) 57,645 gallons D ) 125,456 gallons | A ) 93,949 gallons |
| How much does 1500 gallons of a solution weigh if the specific gravity is 1.36? A ) 2,040 pounds B ) 12,510 pounds C ) 17,014 pounds | C ) 17,014 pounds |
| What does the term pH mean? A ) Hydroxide ion concentration B ) Hydrogen ion concentration C ) Parts Hydrogen D ) None of the above | B ) Hydrogen ion concentration |
| Construction permits for wastewater treatment plants in SC are issued by which agency? A ) DHEC B ) SCECB C ) EPS D ) SCWRC E ) RCRA | A ) DHEC |
| To prevent sludge bulking from occurring, what should be carefully controlled in an activated sludge plant? A ) Suitable sludge age B ) Low D.O. C ) Short aeration period D ) All of the above | D ) All of the above |
| What is the minimum oxygen concentration below which a source of supplied air is required in a confined space? A ) 25.0% B ) 16.0% C ) 21.0% D ) 19.5% | D ) 19.5% |
| What unit of measurement is the equivalent to mg/l? A ) PSI B ) GPG C ) PPM D ) MGD | C ) PPM |
| The variations that affect the activated sludge process are derived from two sources, they are________. A ) Influent and effluent B ) Dischargers to the collection system and in-plant operational variables C ) Type of process and operating train | B ) Dischargers to the collection system and in-plant operational variables |
| Finely divided solids that will not settle but may be removed by chemical means are called ______. A ) Suspended Solids B ) Total Solids C ) Dissolved Solids D ) Colloidal Solids | D ) Colloidal Solids |
| Convert 7,489 GPM to MGD. A ) 1,078 MGD B ) 10.78 MGD C ) 107.8 MGD D ) 12.4 MGD | B ) 10.78 MGD |
| Composite sampling is ____________. A ) used when average constituent or waste concentrations are of interest B ) always associated with continuous flow data C ) used when the wastewater stream is continuous D ) used when it is necessary to c | E ) All of the above |
| What could be the cause if you had pin floc in secondary clarifier overflow and the SVI is good but the effluent is turbid? A ) Denitrification B ) Over oxidized sludge C ) Nitrification D ) Filamentous organisms | B ) Over oxidized sludge |
| An activated sludge plant treats a flow of 2.0 mgd with a primary effluent suspended solids of 160 mg/l. The aeration tank has a capacity of 60,000 cubic feet and a mixed liquor suspended solids concentration of 2100 mg/l. What is the sludge age? A | B ) 2.9 days |
| A 240-gpm mixed media filter operated at a rate of 2 gpm/sqft is backwashed at a rate of 15 gpm/sqft. How many gallons of wash were used with a 3 minute backwash? A ) 5,000 B ) 5,400 C ) 6,000 D ) 6,200 | B ) 5,400 |
| BOD removal in primary sedimentation, providing the detention time is correct, should be about ________. A ) 30 % B ) 40 % C ) 50 % D ) 60 % | A ) 30 % |
| Convert 45 PSI to feet of head. A ) 104 B ) 140 C ) 450 D ) 76 | A ) 104 |
| An operator's certification can be revoked by ____________. A ) any WPCA official B ) receiving compensation for being the operator of record of a facility, not your primary employment C ) any DHEC official D ) other operators at higher cert | E ) giving false information on the certification application |
| By continuously withdrawing chlorine, how many lbs of chlorine can be withdrawn safely from a 150 lb. cylinder at room temperature without the line freezing; A ) 40 lbs/day B ) 50 lbs/day C ) 60 lbs/day D ) The lines will not freeze as long | A ) 40 lbs/day |
| What type of effluent does the most damage to your collection system? A ) Dye plant B ) Dairy C ) Meat packing processing D ) Potato processing waste and potato peels | D ) Potato processing waste and potato peels |
| Before entering a carbon column reactor that was just taken off line, what should you check first? A ) The carbon dust level in the quench tank B ) The UEL C ) The COD level in the effluent D ) The oxygen level in the reactor headspace | D ) The oxygen level in the reactor headspace |
| What should be done to control foaming in an aeration basin? A ) Maintain higher mixed liquor suspended solids concentration B ) Reduce air supply during periods of low flow while still maintaining D.O. C ) Return supernatant to the aeration tan | D ) All of the above |
| How many pounds of solids are in 2200 gallons of sludge that is 97% wet? A ) 222 lbs B ) 550 lbs C ) 2134 lbs D ) 2197 lbs | B ) 550 lbs |
| The positive displacement blower provides a ____________ volume output of air per revolution for a specific set of rotors or lobes? A ) Variable B ) Constant C ) Higher D ) Lower | B ) Constant |
| How many pounds of chlorine gas are necessary to treat 4,800,000 gallons of wastewater at a dose of 2.9 mg/l? A ) 61 lbs B ) 96 lbs C ) 116 lbs D ) 126 lbs | C ) 116 lbs |
| The solids that have sloughed off the trickling filter is usually removed by _________. A ) Sand filters B ) Clarification C ) Polishing filters D ) Digestion | B ) Clarification |
| What routine maintenance should be completed on a pH probe before use? A ) Check membrane B ) Check for zeroing meter C ) Clean probe D ) Check for leakage | C ) Clean probe |
| One major implication of the increasing size of the labor force under 25 years of age is that supervisors must deal with the "generation gap" of different attitudes and ideas. A ) True B ) False | A ) True |
| Which flow measuring device is used to monitor sludge flows in closed pipes? A ) Rotameter B ) Magnetic meter C ) Partial Flume D ) Cipoletti Weir | B ) Magnetic meter |
| Sludge going septic in the secondary clarifier may develop from ________. A ) Return sludge rate too low B ) Excess inorganics in the clarifier C ) Increased detention time D ) All of the above | A ) Return sludge rate too low |
| How many degrees F is 26 degrees C? A ) 68 B ) 78 C ) 85 D ) 98 | B ) 78 |
| How many pounds of polymer daily is required to treat a waste stream with a flow of 145 gpm which requires a polymer dosage of 22 mg/l? A ) 3.83 pounds B ) 38.3 pounds C ) 42.7 pounds D ) 427 pounds | B ) 38.3 pounds |
| How many pounds of chlorine gas would it take to meet a flow of 3,650,000 gpd with a chlorine demand of 0.65 mg/l and having a 0.50 chlorine residual? A ) 5 pound B ) 15 pounds C ) 18 pounds D ) 35 pounds | D ) 35 pounds |
| Calculate the TSS . Initial weight ( filter only ) = 0.5673 Grams Final weight ( filter and dried solids ) = 0. 5779 Grams Sample volume = 250 ml A ) 4.24 mg/l B ) 42.4 mg/l C ) 424 mg/l D ) 4240 mg/l | B ) 42.4 mg/l |
| Flocculation is best achieved by _________. A ) Fast mixing B ) Slow mixing C ) Intermittent fast and slow mixing D ) Sometimes fast mixing and sometimes slow mixing | B ) Slow mixing |
| Given the following data, calculate the average velocity in the channel. Data: 3.0-ft wide channel Flow depth is 2.0 ft Flow rate is 7.2 mgd A ) 1.2 ft/sec B ) 1.9 ft/sec C ) 11.2 ft/sec D ) 32.2 f | B ) 1.9 ft/sec |
| Calculate the weir loading for a sedimentation tank that has an outlet weir 480 ft long and a flow of 5 mgd. A ) 9,220 gpd/ft B ) 9,600 gpd/ft C ) 9920 gpd/ft D ) 10,417 gpd/ft | D ) 10,417 gpd/ft |
| A pump can deliver 1,200 GPM at a total head of 253.7 feet. What is the pressure equivalent to this head , expressed in PSI. A ) 84 psi B ) 96 psi C ) 110 psi D ) 121 psi | C ) 110 psi |
| What is the solid concentration in ppm if a sludge contains 94% moisture? A ) 9400 mg/l B ) 9400 ppm C ) 6,000 ppm D ) 60,000 mg/l | D ) 60,000 mg/l |
| What is the F/M loading ratio in an activated sludge plant with a flow of 2.7 mgd? The average BOD to the aerator is 150 mg/l, the aeration tank contains 500,000 gallons, and the MLVSS concentration is 2,650 mg/l. Select the closest answer. A ) 21 lbs | D ) 31 lbs BOD per day/100 lbs mlss |
| Both acids and bases can injure you. A ) True B ) False | A ) True |
| The supervisor or middle manager has the most control over which type of motivation? A ) wages B ) fringe benefits C ) working conditions D ) employee sense of achievement | D ) employee sense of achievement |
| What type of maintenance is required on a dissolved oxygen probe? A ) Replace Membrane B ) Replace Batteries C ) Replace KCL Solution D ) All of the above | D ) All of the above |
| The most important use of chlorine in a wastewater plant is _________. A ) As an aid to coagulation B ) As an Algaecide C ) To Sterilize D ) To Disinfect | D ) To Disinfect |
| Effectiveness of the activated sludge treatment process in reducing the waste load depends upon ________. A ) The amount of activated sludge solids in the system B ) The amount of solids wasted each day C ) The organic strength of the wastes ent | A ) The amount of activated sludge solids in the system |
| The growth rate of nitrifying microorganisms is affected very little by the _______ load to the aeration system. A ) inorganic B ) organic C ) thermal D ) hydraulic | B ) organic |
| In order to maintain certification of laboratory for each parameter, the laboratory will analyze a minimum of _____ performance audit sample (s) annually where technical feasible. A ) one B ) two C ) three D ) four | A ) one |
| Determine the chlorinator setting for a waste flow of 60,000 GPD that requires a chlorine dosage of 16 mg/l. A ) 8.0 lbs/day B ) 9.1 lbs/day C ) 10.3 lbs/day D ) 11.5 lbs/day | A ) 8.0 lbs/day |
| Horizontal communication is __________. A ) rumors spreading throughout the department B ) people talking in general in the same department C ) people at the same level in different departments communicating D ) supervisors talking to employe | C ) people at the same level in different departments communicating |
| What is the chlorine dose in mg/l when 21.6 pounds were applied to a plant flow of 785,000 GPD? A ) 3.3 mg/l B ) 3.8 mg/l C ) 4.2 mg/l D ) None of the above | A ) 3.3 mg/l |
| The conversion of ammonia to nitrate requires significant amounts of _________. A ) Water B ) Biomass C ) Oxygen D ) Carbon Dioxide | C ) Oxygen |
| As the impeller wears on a pump the pump efficiency will _________. A ) Increase B ) Decrease C ) Have no affect D ) I have no idea | B ) Decrease |
| Which agency can revoke an operator's certification? A ) DHEC B ) SCWPCA C ) ETC D ) ECB (LLR) E ) EPA | D ) ECB (LLR) |
| Over tightening of the gland on a pump shaft will produce what effect? A ) Overheated bearing B ) Bearing failure C ) Faster shaft wear D ) All of the above | D ) All of the above |
| The formal communication network refers to _________. A ) only written messages B ) the way the company is organized C ) only upward communication D ) downward communication | B ) the way the company is organized |
| A leaking chlorine cylinder should be positioned ___________. A ) With the leak toward the fan B ) With the valve up to avoid freezing C ) With the leak such that the chlorine gas escapes D ) By placing the cylinder in a tank of water | C ) With the leak such that the chlorine gas escapes |
| Calculate the detention time of a circular clarifier, 60 feet in diameter, 12 feet deep, with a flow of 2.1 MGD. A ) 2.9 hours B ) 5.5 hours C ) 1.5 hours D ) 4.4 hours | A ) 2.9 hours |
| How are industrial wastewater sludges dewatered? A ) Incineration B ) Landfills C ) Vacuum Filtration D ) All of the above | C ) Vacuum Filtration |
| A plant ran blowers for 24 hours at 6,000 cuft/min. How many cubic feet of air were required to remove a pound of BOD per day if the activated sludge system removed 7,250 lbs BOD? A ) 595 B ) 660 C ) 1,100 D ) 1,192 | D ) 1,192 |
| Which is a part of a centrifugal pump? A ) Piston B ) Diaphragm C ) Volute D ) Flact | C ) Volute |
| What is the surface area of a clarifier that is 45 feet in diameter and has a depth of 8 feet? A ) 1589.6 square feet B ) 1245 square feet C ) 1589.6 cubic feet D ) 1245 cubic feet | A ) 1589.6 square feet |
| How many people must be standing topside to assist someone that is entering a manhole? A ) One, if safety harness is used B ) None, if a SCBA is used by all personnel C ) Two, even if a SCBA is worn by the entering personnel D ) None, if safe | C ) Two, even if a SCBA is worn by the entering personnel |
| A composite sample will give a(n) A ) Even color. B ) High pH. C ) Instantaneous sample. D ) Representative sample. | D ) Representative sample. |
| At what rate in gpm must wash water be delivered to a mixed media filter to attain a backwash rate of 20 gpm/sqft if the flter is 25 ft wide and 25 ft long? A ) 600 B ) 2,400 C ) 3,000 D ) 12,500 | D ) 12,500 |
| Gas chlorinators when operated at a high rate of withdrawal from the cylinder can result in ________. A ) An explosion B ) Overheating of the cylinder C ) Ice formation on the cylinder D ) No effect | C ) Ice formation on the cylinder |
| Calculate MCRT if aeration volume is 1,000,000 gallons, final clarifier volume is 500,000 gallons, flow to aerator is 4 mgd, waste sludge for past 24 hours is 0.075 mgd, MLSS is 2400 mg/l, RAS is 6,200 mg/l and final effluent suspended solids (SS) is 1 | D ) 4.67 days |
| Which of the following would indicate an alkaline pH? A ) 2.0 B ) 7.0 C ) 9.0 D ) None of the above | C ) 9.0 |
| The activated sludge plant may be operated in any one of three ranges or operational zones such as high rate, conventional and extended aeration on the basis of ___________ A ) Type of wastes B ) Amount of flow C ) Sludge age D ) Wasting of s | C ) Sludge age |
| What routine maintenance should be performed on the on off indicator lights on a control panel? A ) Check power supply B ) Test bulbs C ) Check terminal connections D ) Clean off surface | B ) Test bulbs |
| A blank is used in lab tests for comparison purposes. A ) True B ) False | A ) True |
| How many pounds of alum are required to make up 55 gallons of 2% alum solution. A ) 9.17 lbs B ) 10.33 lbs C ) 11.96 lbs D ) 13.21 lbs | A ) 9.17 lbs |
| What activated sludge process is when the return sludge is introduced separately and the primary effluent is admitted to the aeration tank at several different locations? A ) Step Feed aeration B ) Kraus process C ) Extended Aeration D ) Cont | A ) Step Feed aeration |
| Calculate the sludge age for an activated sludge process if the aerator volume is 0.5 mg and the MLSS concentration is 2100 mg/l. The influent flow is 4.0 mgd, and the primary effluent suspended solids concentration is 70 mg/l? A ) 2.75 days B ) 3. | B ) 3.75 days |
| Your system's billing is based on the water usage rate. Your system bills quarterly at a rate of $0.60/1000 gallons for the first 10,000 gallons, $0.40/1000 gallons for the next 15,000 gallons, and $0.30/1000 gallons for more than 25,000 gallons. If a cus | B ) $17.25 |
| The typical growth pattern of bacteria is in four distinct phases. The stationary phase is ______. A ) Cells grow in numbers B ) Cells grow in size, not in numbers C ) Population remains constant because death rate equals multiplying rate D ) | C ) Population remains constant because death rate equals multiplying rate |
| The microscopic evaluation of bio-disc yield: 1st- free moving ciliates 2nd- stalked ciliates and rotifers 3rd- rotifers and bloodworms This indicates that the wastewater is _________. A ) Septic B ) Normal C ) Aerobic D ) Anaerobic | B ) Normal |
| The optimum wastewater temperature range is between _____F and _____ F for good nitrification. A ) 40, 80 B ) 50, 90 C ) 60, 95 D ) 50, 110 | C ) 60, 95 |
| Air flow through a trickling filter when the influent is warmer than the air temperature is ______. A ) Upward through the filter. B ) Downward through the filter. C ) Inadequate and may require forced air ventilation. D ) Improved by decreas | A ) Upward through the filter. |
| The variations that affect the activated sludge process are derived from two sources. They are _________. A ) Influent and effluent B ) Dischargers to the collection system and in-plant operational variables C ) Type of process and operating tra | B ) Dischargers to the collection system and in-plant operational variables |
| Authority is __________. A ) ultimate power B ) the right to direct or request subordinates to do or to refrain from doing something C ) the power to reprimand and punish subordinates for doing or no doing something D ) both b and c | D ) both b and c |
| How many degrees C is 66 degrees F? A ) 18.7 B ) 19.0 C ) 19.8 D ) 20.8 | B ) 19.0 |
| Although flow measuring devices are not for treating wastes, it is important to calculate the _______. A ) Chlorination rates B ) Aeration rates C ) Loading calculations D ) All of the above | D ) All of the above |
| All standard operating procedures (SOP's) manual should include___________. A ) scope and application B ) summary of method C ) safety D ) interferences E ) All of the above | E ) All of the above |
| A good equipment preventive maintenance program should include provisions for ______. A ) Ensuring proper and efficient operation of the equipment B ) Extending equipment life C ) Protecting the public's investment D ) All of the above | D ) All of the above |
| Calculate the Surface Loading Rate of a clarifier with a 60ft diameter and depth of 12.6 ft. The average flow is 2.75 MGD. A ) 72 gpd/sqft B ) 98 gpd/sqft C ) 763 gpd/sqft D ) 973 gpd/sqft | D ) 973 gpd/sqft |
| If your plant becomes upset, the first action before making any changes is to _______. A ) Yell h-e-l-p B ) Check the plant data for at least three previous weeks C ) Hold a brain storming meeting with the other operators D ) Don't panic, the | B ) Check the plant data for at least three previous weeks |
| A chlorine calibration curve must be generated? A ) Each day meter is in use B ) Annually C ) When a new lot number of DPD reagent pillows is used D ) Both B & C | D ) Both B & C |
| Visual messages are __________. A ) outdated today B ) required to be in color due to the influence of color TV C ) useless D ) often under estimated in effectiveness | D ) often under estimated in effectiveness |
| What is the most important and all-inclusive aspect of supervision? A ) proper utilization of finances B ) proper utilization of people C ) proper utilization of equipment D ) proper utilization of all resources | D ) proper utilization of all resources |
| What is the solids recovery rate of this vacuum filter? Data: Filter area = 500 sqft Hours of operation = 10 Sludge filtered = 80,000 gallons Sludge solids = 3% Sludge volatile solids = 70% | D ) 90% |
| One advantage of aerobic digestion is that? A ) No explosive gas is produced B ) Acidic conditions do not exist C ) Methane production is higher than in anaerobic digestion D ) Solids can be broken down to 0 % volatile | A ) No explosive gas is produced |
| If the effluent turbidity changes from 200 t.u. to 500 t.u. and you want the pH not to increase any further, what chemical would one use? A ) Alum B ) Ferric Chloride. C ) Polymer. D ) Sodium Aluminate. | C ) Polymer. |
| Determine the surface loading rate of a rectangular clarifier 60 feet long, 26 feet wide and 10 feet deep when the plant flow is .68 MGD. A ) 436 gpd/sqft B ) 496 gpd/sqft C ) 571 gpd/sqft D ) 603 gpd/sqft | A ) 436 gpd/sqft |
| If degradation is observed or standard readings differ more than ____% of the true values, new secondary and even primary standard solutions should be made before the expiration date. A ) 2% B ) 4% C ) 10% D ) 20% | C ) 10% |
| Organic chemistry is concerned with compounds containing the element _____. A ) Iron B ) Methane C ) Phosphorous D ) Carbon | D ) Carbon |
| A centrifugal pump is pumping 200 gpm against a 40-ft total pumping head at a daily rate of 288,000 gpd. The output power of the pump is approximately ___________hp. A ) 0.5 B ) 2 C ) 15 D ) 121 | B ) 2 |
| Which flow measuring device is the most efficient? A ) Weir B ) Flume C ) Differential Pressure D ) Orifice | B ) Flume |
| Using management by objectives, the employee usually sets a stricter evaluation out for himself than the employer would do. A ) true B ) false | A ) true |
| % difference of specific gravity of water and waste, given water 1.0 and waste 1.2? A ) 2.0% B ) 20% C ) 0.2% D ) 0.02% | B ) 20% |
| Each certified laboratory must have ______________. A ) Standard operating procedures B ) A minimum of two qualified lab technicians C ) A minimum of 225 square feet of working space D ) A certified lab technician as technician of record | A ) Standard operating procedures |
| What reference should the operator use in troubleshooting problems at a wastewater treatment plant? A ) Only the manufacturer's technical manuals B ) Use the O & M manual as a guide and reference C ) Call the technical assistance department at D | B ) Use the O & M manual as a guide and reference |
| Two major types of bacteria are present in an anaerobic digester, they are? A ) Acid formers and alkaline formers B ) Macro and microorganisms C ) Acid formers and gas formers D ) Gas formers and alkaline formers | C ) Acid formers and gas formers |
| Activated sludge is a mixture culture of microorganisms consisting of bacteria and ______. A ) Worms B ) Fungi C ) Algae D ) All of the above | D ) All of the above |
| Your chlorinator is set on 4 lbs/ 24 hours. If the plant is operated at a rate of 300,000 gpd, how many mg/l of chlorine is being fed. A ) 1.6 mg/l B ) 16 mg/l C ) 4.5 mg/l D ) 45 mg/l | A ) 1.6 mg/l |
| A laboratory having lost certification for falsifying reports or misrepresenting data will not be eligible for re-certification for a period of ____________. A ) 1 year B ) 3 years C ) 5 years D ) Never | A ) 1 year |
| The repeatability of an instrument to reproduce results is called _________. A ) Reproduction B ) Precision C ) Accuracy D ) Duplication | B ) Precision |
| A dissolved oxygen meter must be calibrated each day before it is used. A ) True B ) False | A ) True |
| When working on any piece of electrical equipment , the circuit breaker should be ______. A ) Open B ) Removed C ) Locked out D ) Locked open and tagged with a warning | D ) Locked open and tagged with a warning |
| Before starting any blower, be sure all inlet and discharge valves ______. A ) Are open B ) Are closed C ) Are ready to open when air pressure builds up D ) Valves will open up automatically when pressure builds up | A ) Are open |
| If the pH of a stream was usually 7.9 su. What buffer (s) would you use to calibrate your meter? A ) 7.0 only B ) pH 4, pH 7, pH 10 C ) pH 7, pH 10 D ) pH 4, pH 7 E ) pH 4, pH 10 | C ) pH 7, pH 10 |
| The presence of free swimming ciliates indicate the process is _______. A ) Declining quickly B ) Approaching stable conditions C ) F/M ratio high and high MCRT D ) F/M ratio low and high MCRT | B ) Approaching stable conditions |
| What is the mean cell residence time with an aerator volume of 1 mgd, the final clarifier volume is 350,000 gallons and the wastewater flow to the aerator is 6.0 mgd. the waste sludge flow for the past 24 hours was .083 mgd, the mixed liquor concentration | B ) 4.5 days |
| When operating an anaerobic digester, the operator should not allow the temperature in the digester to vary more than ______. A ) 2 degrees C /day B ) 1 degree C /day C ) 2 degrees F /day D ) 1 degree F/day | D ) 1 degree F/day |
| Results from a 30-minute settleability test can be used to calculate the ______. A ) F/M Ratio B ) Return Sludge Rate C ) MCRT D ) BOD Loading | B ) Return Sludge Rate |
| How many pounds of solids are in a 350,000 gallon aeration tank if the suspended solids concentration is 2500 mg/l? A ) 1,047 B ) 1,168 C ) 6,545 D ) 7,298 | D ) 7,298 |
| Calculate the detention time of a circular clarifier, 60 feet in diameter and 12 feet deep with a flow of 2.1 MGD. A ) 2.9 hours B ) 3.7 hours C ) .05 hours D ) 2.2 hours | A ) 2.9 hours |
| In an anaerobic digester the gas mixture is usually ________. A ) 70 % methane and 30 % carbon dioxide B ) 30 % methane and 70 % carbon dioxide C ) 50 % methane and 50 % hydrogen sulfide D ) 65 % propane and 35 % oxygen | A ) 70 % methane and 30 % carbon dioxide |
| Once you have collected a micro sample, it should be taken to the laboratory and prepared for analyses within _________. A ) 15 minutes B ) 30 minutes C ) 45 minutes D ) 60 minutes | A ) 15 minutes |
| Once a laboratory is certified, a laboratory can have its total certification withdrawn by ___________. A ) knowingly and willfully falsifying data B ) error in analyses of a parameter C ) not obtaining "acceptable" results on a performance audi | A ) knowingly and willfully falsifying data |
| If chlorine costs $0.21/lb, what is the daily cost to chlorinate 8.0 MGD of wastewater to an initial concentration of 2.4 mg/l? A ) $1.95 B ) $3.25 C ) $20.84 D ) $33.63 | D ) $33.63 |
| The settleability test is a good indication of how solids will _______. A ) Increase the loading on the digester B ) Settle in a clarifier C ) Be removed through filtration D ) Affect the aeration loading | B ) Settle in a clarifier |
| What is the total volume in cubic feet of a cone shaped clarifier 6ft high and 12ft in diameter? A ) 48 cuft B ) 96 cuft C ) 226 cuft D ) 678 cuft | C ) 226 cuft |
| The sludge disposed of on a landfill should be monitored for which metals? A ) Arsenic, chromium, and strontium B ) Arsenic, lead, and selenium C ) Lead, mercury, and germanium D ) Cadmium, chromium, and cobalt | B ) Arsenic, lead, and selenium |
| What would represent Alkalinity? A ) Hydroxyl Ions B ) Calcium Carbonate C ) Carbonate, Bicarbonate, Hydroxide ions D ) Hydrogen ions | C ) Carbonate, Bicarbonate, Hydroxide ions |
| The centrifugal blower air lines are connected to the blower through flexible couplings in order to keep ___________ to a minimum and to allow for heat expansion? A ) Noises B ) Vibrations C ) Heat loss D ) Costs | B ) Vibrations |
| What should be the waste sludge pumping rate (gpm) if a plant should be wasting 2,240 pounds per day and the concentration of return sludge is 8,000 mg/l? A ) 0.34 gpm B ) 23.3 gpm C ) 0.55 gpm D ) 55.6 gpm | B ) 23.3 gpm |
| The ______________ test is a quick way to determine the quality of your plant effluent? A ) Turbidity B ) Chlorine residual C ) BOD D ) pH | A ) Turbidity |
| Determine the F/M ratio with a COD of 100 mg/l applied to aeration tank, an influent flow of 7.65 mgd and 33,075 lbs. of solids under aeration, 70% of the MLSS are volatile solids (matter). A ) 0.25 lbs. B ) 0.27 lbs. C ) 0.32 lbs. D ) | B ) 0.27 lbs. |
| A graduated cylinder measures liquid volumes more accurately than beakers but less accurately than burets. A ) True B ) False | A ) True |
| The pH of the mixed liquor decreases to 6.7 or lower and the sludge becomes less dense, what was the probable cause? A ) Basic wastewater entering plant B ) Inadequate rate of return sludge C ) MLSS to low D ) Nitrification occurring and wast | D ) Nitrification occurring and wastewater alkalinity too low |
| What routine maintenance should be performed on a weir? A ) Clean face plate B ) Smooth weir lip C ) Remove accumulations/obstructions D ) All of the above | D ) All of the above |
| The saturation concentration of dissolved oxygen in water varies with temperature. A ) True B ) False | A ) True |
| Which material represents the greatest dust hazard? A ) Activated carbon B ) Sludge containing 40% solids C ) Hydrated lime D ) Caustic flakes E ) 50% liquid caustic | A ) Activated carbon |
| How long would you allow an activated sludge process to react and stabilize after a change? A ) 12 hours B ) 24 hours C ) One day D ) One week | D ) One week |
| The outlet of a forced ventilation system for a chlorinator room should be located _______. A ) At the ceiling B ) Near the floor C ) Half way up the wall D ) Anyplace where space is available | B ) Near the floor |
| An industrial waste spill containing methanol hit the plant on the 27th day of the month. The air requirements immediately increased due to the COD of the methanol and the increased activity of the microorganisms. What was done to correct the situation? | A ) The waste sludge rate was increased to maintain the desired volatile % |
| Lab data indicated that the SVI's were high during the first four days of the month. An inspection of the mixed liquor under a microscope on the first day indicated excessive filamentous growths. What was done by the operator to correct the situation by t | B ) Chlorinate the return sludge |
| What multi-cellular animals are an indication of an old activated sludge with a high MCRT, and are usually associated with a turbid effluent? A ) Stalked ciliates B ) Free swimming ciliates C ) Worms D ) Rotifers | D ) Rotifers |
| The most important thing to do during a bad chlorine leak is ________. A ) Try to return chlorine feed equipment to operation as quick as you can B ) Take care of the leak in a safe manner then return to normal operation C ) Patch leak with supe | B ) Take care of the leak in a safe manner then return to normal operation |
| The centrifugal blower provides a ____________ air output? A ) Variable B ) Constant C ) Higher D ) Lower | A ) Variable |
Created by:
Proveaux