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STP
| Question | Answer |
|---|---|
| Q. What Does CBOD-5 stand for? The 5 is a subscript. | A. Carbonaceous Biological O2 Demand Limits: average <25 mg/L (influent); instantaneous maximum < 50 mg/L |
| Q. If Carbonaceous Biological O2 Demand (CBOD5) is 211 mg/L influent, what would your actions be? | A. Limits: average <25 mg/L (influent); instantaneous maximum < 50 mg/L Your actions would be? Determine if inlet or outlet first. |
| Q. After the A and B clarifiers, where does the water go? | A. Clarified water storage tanks. |
| Q. If you took a pH reading at the discharge of the B clarifier what would you expect it to be? | A. ? |
| Q. If you tested the outfall 005 and got a pH of 3.1, what would your action be? | A. CY-PB-110-402 (NPDES) SAMPLING procedure 5.1.8 5.1.8. IF a limit exists for the sample and analysis you are obtaining, especially for onsite analysis, then KNOW the limit so that immediate actions, like supervisor notification and a resample are perf |
| Q. If you tested the outfall 005 and got a pH of 6.1, what would your action be? | A. This is at the low end of the 6-9 band. Contact FLS and determine the trend and cause. |
| Q. If you tested the outfall 005 and got a pH of 9.1, what would your action be? | A. 5.1.8. IF a limit exists for the sample and analysis you are obtaining, especially for onsite analysis, then KNOW the limit so that immediate actions, like supervisor notification and a resample are performed promptly (reference Attachment #3 section |
| Q. You enter the STP building and find the blowers off, what would happen if they stayed off? | A. |
| Q. You enter the STP building and find the blowers off, where do you restart them? | A. |
| Q. What percent of the input to the STP is solids? | A. <0.1% By wt or volume?.. |
| Q. What percent of the input solids in the STP input is dissolved? | A. 2/3 |
| Q. What % of the STP input solids is organic? | A. 50% organic and 50% inorganic. |
| Q. If the CBOD5 goes up, the water being discharged is more or less poluted? Why? | A. Increased CBOD5 = more poluted. Because more O2 comsumed by mocroorganisms in degrading matter, less available to support marine life. |
| Q. Where do we get the CBOD5 value from? Carbonaceous Biological O2 Demand = CBOD5 | A. 2 locations. Inlet (grab sample) and outlet wiht a flow-weighted composit sample. |
| Q. What is a typical hold time in the clarifiers? | A. |
| Q. The STP is a ________ of well-coordinated systems and you are the ___________. | A. The STP is a symphony of well-coordinated systems and you are the conductor. |
| Q. Over the years, many _________have been learned and they are being ______ __ to you. | A. Over the years, many lessons have been learned and they are being passed on to you. |
| Q. What are the Carbonaceous Biological O2 Demand (CBOD5)limits? | A. A. Carbonaceous Biological O2 Demand Limits: average <25 mg/L (influent); instantaneous maximum < 50 mg/L |
| Q. Dose the CBOD vary with the weather or season? Does it go up during times of high inflow like an outage? | A. find out how CBOD varies with season, temperature and inflow rates. |
| Q. A vacuum truck backs up too far and hits the chlorine hold-up tank knocking it off its base and causing a 20 gallon/min leak from the side of it on the side toward the road. Immediate actions? | A. find out what type of spill this is? Only chloranation has not been done and the final samples. |
| Q. What is the normal STP forward flow? How is Forward Flow Controlled? | A. |
| Q. What are the STP forward flow forward flow limits and what are they based on? | A. |
| Q. What are 3 possible causes of the STP forward flow increasing or decreasing outside the normal limits. | A. |
| Q. When you are in the CTO looking at the STP Forward flow and recirculation flow, what range of values do you expect to see? | A. |
| Q. What would you do if the recirculation flow went to it's maximum value? What is that value? What would the most likely cause be? How quickly would you need to respond? | A. |
| Q. If the recirculation flow went to it's maximum value and it was not noticed for an hour what would most likely happen to STP effluent chemistry? Would any alarms be activated? Which ones? Where would they be heard or seen? Notifications? | A. |
| Q. Forward flow drops to zero. What are your actions? What would likely occur if no action was taken by the operator? What alarms would come in? Where would they come in and what values activate them? | A. |
| Q. If the recirculation flow goes to zero and stays that way, what would be the results on STP chemistry in 24 hours. | A. |
| Q. If one filter were plugged and could not be used, what impact would this have on the STP long term? | A. |
| Q. Input flow into the STP is into what tank? | A. |
| Q. If the heat were lost in the building and would be out for at least 48 hours in zero degree weather, what would be the first priority? Second? Third? | A. |
| Q. If a gallon of Hydrochloric acid was poured into the splitter box, what would be the effect on the system? What would be the speed of these effects? Would you anticipate an NPDES permit violation? | A. |
| Q. If a gallon of #2 oil was poured into the splitter box, what would be the effect on the system? What would be the speed of these effects? Would you anticipate an NPDES permit violation? | A. |
| Q. What is Alum for in the STP process. Where is it added? How often? What would you expect to happen if the dose was increased by a factor of 10? | A. |
| Q. Organic materials include | A. Organic materials include waste products of animal and vegetable life, dead animal material, plant tissue and are generally combustible. Organic materials are subject to decay or decomposition via bacteria action. |
| Q. Inorganic materials are normally _____and are not subject to decay. They are not combustible and consist of ____, ____, ____and mineral _____. | A. Inorganic materials are normally inert and are not subject to decay. They are not combustible and consist of sand, gravel, silt and mineral salts. |
| Q. Bacteria are defined as living organisms, microscopic in size, which can eat, respirate, grow and excrete. They require both ____and ______ although they are seldom more than a ___ ____. | A. Bacteria are defined as living organisms, microscopic in size, which can eat, respirate, grow and excrete. They require both food and oxygen although they are seldom more than a single cell. |
| Q. _________ __________ is a detailed process which consists of aerobic bacteria feeding on organic solids and producing wastes which are eaten by aerobic and anaerobic bacteria. The final result is a stable end product of mostly inorganic matter. | A. Biological decomposition is a detailed process which consists of aerobic bacteria feeding on organic solids and producing wastes which are eaten by aerobic and anaerobic bacteria. The final result is a stable end product of mostly inorganic matter. |
| Q. Normally sewage treatment is handled in some variety of a common five-step process. What are the 5 steps? | A. 1) Preliminary Treatment 2) Primary Treatment 3) Secondary Treatment 4) Chlorination 5) Sludge Treatment |
| Q. Preliminary treatment at Peach Bottom consists of a ..... | A. Preliminary treatment at Peach Bottom consists of a rotary screen which removes any unwanted paper products and debris prior to entering the above ground equalization basin, and discharges the waste into an adjacent dumpster. |
| Q. Peach Bottom uses an _______ ______ Process. | A. Peach Bottom uses an Activated Solids Process. solids known as activated sludge. |
| Q. A 1/2" line from the sodium hydroxide pumps gives us the capability of pH control at this point. Where is this added? What is the pH? | A. At the splitter box located outside the building. pH it about 14. |
| Q. How many Aeration Tanks are they and what is the capacity of one? | A. There are two aeration tanks. These tanks both have a capacity of 7500 gallons. |
| Q. What is the capactity of the Chlorine Contact Tank? | A. a. This is a 1500 gallon capacity, baffled tank, of sufficient size to ensure micro-organisms are killed prior to discharge to the canal. PA DER regulations require sufficient chlorine contact time to ensure killing these micro-organisms. |
| Q. What fundamentals could be associated with the chlorine contact tank? | A. Environmental and industrial safety. |
| Q. What are the 3 chemical addition skids? | A. Sodium Hydroxide, Sodium Hypochlorite, Aluminum Sulfate Skid |
| Q. Chlorination Tank/Hypochlorite Pumps operate to maintain total chlorine levels. When in Auto, when does the pump run? | A. a. Auto - Runs When A Filter Feed Pump Is Operating b. Hand - Runs Continuously |
| Q. What are the switch positions for the Alum Pump? | A. Hand-Off-Auto Switch Positions |
| Q. How is the alum pump speed controlled? | A. The alum pump speed is automatically controlled by the forward flow (EQ pump discharge flow). |
| Q. What are the typical Microorganisms Found at the Sewage Treatment Plant? There are 4. | A. Free Swimmers, Stalked Ciliates, Rotifers, Bacteria |
| Q. Related to Growth Phases, what are the 5 primary phases. | A. Log Growth Phase, Decreasing Growth Phase, Stationary Phase, Increasing Death Phase, Death Log Phase |
| Q. "Wasting Sludge" refers to what? | A. "Wasting Sludge" refers to pumping sludge from the clarifier to the waste sludge tank. |
| Q. How the Wasting sludge time determined? | A. Wasting sludge time can also be determined using a settleable solids count. |
| Q. Normally the settleable solids volume will range from ?-? ml/sample.volume. | A. Normally the settleable solids volume will range from 300-600 ml/sample.volume. |
| Q. The settleable solids volume of younger sludge will be more or less than the 300-600? | b. Younger sludge will yield a quantity which is greater than that listed above. Dense inorganic material will settle quickly. c. Older sludge will yield a lower volume than the above listed samples |
| Q. Sludge Blanket Samples are taken where and for what purpose? | A. Sludge Blanket Samples are taken on the clarifier to determine the depth of the sludge on the bottom of the clarifier. |
| Q. What should the sludge blanket sample value be? | A. Try to maintain less than 2' to keep the sludge below the level of the clarifier rake and therefore settled. |
| Q. How is the sludge blanket sample taken? | A. c. Use a clear tube with a ball check valve arrangement on the end of it to obtain the sample. |
| Q. What is an industrial safety concern with Alum? | A. Fundamentals: Industrial Safety – Alum is very slippery on hard surfaces. |
| Q. what is added to the "B" Equalization Basin and/or aeration tanks. | A. Alum Added to the "B" Equalization Basin and/or aeration tanks. |
| Q. What Helps to control the phosphate (PO4) inventory and limit total phosphorus in Sewage Plant effluent. | A. When added to the "B" Equalization Basin and/or aeration tanks, Aluminum Sulfate (Alum) Helps to control the phosphate (PO4) inventory and limit total phosphorus in Sewage Plant effluent. |
| Q. How often is an NPDES permit report completed? | A. The chemistry department Completes a monthly NPDES permit report. |
| Q. Safety protection required when handling chemicals in Sewage Treatment Plant. | A. 1) Aluminum Sulfate Goggles, Gloves, Rubber Apron 2) Sodium Hypochlorite Goggles, Gloves, Rubber Apron 3) Sodium Hydroxide Goggles, Gloves, Rubber Apron |
| Q. The chemistry samples for the following: | A. Fecal, CBOD, Phosphorus, TSS, Dissolved O2 |
| Q. Fecal limits are? | A. (1) May to Sept. 200 colonies/100 M/L (2) Sept. to May 2000 colonies/100 M/L |
| Q. CBOD5 – Carbonaceous Biological O2 Demand limits are? | A. (1) Ave < 25 mg/L (Influent); instantaneous maximum < 50 mg/L. (2) The higher the CBOD5, the more polluted the water. (3) Indicated amount of "food" in water. |
| Q. Phosphorus limits are? | A. (1) Ave < 2.0 mg/L; 4.0 mg/L instantaneous maximum. (2) Promote the growth of algae, which will choke off the river. |
| Q. TSS - Total suspended solids | A. (1) Ave < 30 mg/L; 60 mg/L instantaneous maximum. (2) The higher TSS, the dirtier the water. |
| Q. pH Maintain between ? and ?. | A. pH Maintain between 6 and 9. |
| Q. Dissolved O2 is also sampled for and recorded, limit is > ?.0 mg/L. | A. Dissolved O2 is also sampled for and recorded, limit is > 5.0 mg/L. |
| Q. What is Geometric Mean? | A. 3.7. Geometric Mean (average) is defined as the nth root of the product of n measurements, (a1*a2*…..an)1/n. |
| Q. Why is Fecal Coliform measured reported as Geometric Mean? | A. |
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