Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

waste Management q3

Modules 8 and 9

QuestionAnswer
What is a landfill? A facility for disposal/long term storage of solid wastes
What is a sanitary landfill? Specifically engineered to decrease environmental and public health risks
What is a secure landfill? Used for hazardous solid wastes
Three processes involved in landfilling. Monitoring, waste placement/compaction, and environmental controls
What is a cell? Volume of waste in a specific operating period
What is the daily cover? 15 cm of native soil
What is final cover? Multiple layers of synthetic/natural materials plus native soil.
What is the purpose of the final cover? Prevents infiltration, collects surface runoff, and supports vegetative growth
What is a lift? A complete layer of cells
What is a terrace? Think of aztec pyramids. Maintains the slope and includes collection spillways
What is leachate? Liquid collected along the bottom of the landfill due to precipitation, surface runoff, residual liquids, reaction products and groundwater seepage
Main components of landfill gas Methane and carbon dioxide
Purpose of the landfill liner Prevents liquid/gas from going in or out of landfill
Post-closure activities Environmental monitoring, leachate collection, gas management, cap repairs, and vegetation maintenance
The landfill design not allowed in Alberta Canyon
The three landfill designs Area, Trench, Canyon
Classes of landfill I- hazardous II- sanitary III- inert c/d
Do landfills that receive less than 10 000 tonnes of nonhazardous waste need an approval? No but they do need a code of practice
Landfills cannot be near airports, T or F T
What is the hydraulic conductivity requirement of liners? 1 x 10^-7
Site selection criteria for landfills. 40/52 rule Enough area Not near airports/waterbodies Accessible Good soil Climate considerations
From bottom to top, what are the layers in a class I landfill? Dewatering pump Recompacted clay (30cm) Secondary liner (x2 welded HDPE) Geonet Leak detection Geotextile Sand (30cm) Gets repeated with primary liner and leachate collection 60 cm gravel
How do you inspect for leaks in the double welded liner? Vacuum box
Why are cells useful? Keeps landfill organized and provides a means of record keeping
Typical cell depth after compaction? 70 cm to 1m
Benefits of landfill compaction? Decrease landfill volume and increase landfill life
Disadvantage of landfill compaction? Slows down biodegragation
Benefits of daily cover. Decreases odor, prevents pests, marks each cell
Daily cover ratio 1 cover: 5 waste
Why is the landfill sloped? Aids in leachate collection
How many gas collection areas are there in a landfill? One per lift
Why recover landfill gas? Methane has a high fuel value. Prevent fires and explosions Methane has a high GWP
Gas collection installation types Mini flares and steam turbines
Gas evolution phases I - Aerobic decomposition- N2 and O2 II- Transition phase- Anaerobic starts- CO2 starts rising III- Acid phase- CO2 peaks and OA rises IV- Methane fermentation- methanogenic processes V- Maturation phase- N2 and O2
Gas evolution timelines I- 1 week II- 6 mo III- 3-5 yr IV- 40 yr V- Forever
What do you do with leachate once it is collected? Recycle it, thicken it, treat it
Leachate characteristics High TDS, BOD, COD, nutrients, heavy metals
Aerobic leachate treatment 1 kg of O2 per kg COD Shallow ponds, sludge, biofilters, RBC
Anaerobic leachate treatment Deep lagoons, biofilters, bioreactors
The good and bad of biological treatment Aerobic- low/medium conc., sensitive to DO and metals Anaerobic - high conc., sensitive to acid and temperature
Physical leachate treatment Equalization, settling, reverse osmosis
Chemical leachate treatments Neutralization Flocculation Redox Steam stripping Carbon adsorption
Describe steam stripping Steam in at bottom, leachate in at top. Steam removes organics
Piezometers Nested piezometers measure landfill gas in the vadose/unsaturated zone
Lysimeters Detect leachate in the unsaturated vadose zone. Vacuum aids.
Where does groundwater monitoring occur Upstream and downstream
Created by: swilson67
Popular Science sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards