CES Pollution Control & Waste Management 3 — Questions and Answers
Question 1: The Toxicity Characteristic Leaching Procedure (TCLP) is used to determine if a waste is hazardous. What does this test simulate?
- Industrial incineration conditions
- Co-disposal of waste in a municipal landfill with acidic leachate (Correct answer)
- Ocean dumping dilution factors
- Atmospheric weathering of waste piles
Correct answer: Co-disposal of waste in a municipal landfill with acidic leachate
TCLP simulates the leaching that occurs when hazardous waste is co-disposed with municipal solid waste in a landfill.
Question 2: Which greenhouse gas has the highest 100-year global warming potential (GWP) among the following?
- Carbon dioxide (CO2)
- Methane (CH4)
- Nitrous oxide (N2O)
- Sulfur hexafluoride (SF6) (Correct answer)
Correct answer: Sulfur hexafluoride (SF6)
SF6 has a GWP of approximately 23,500 over 100 years, making it the most potent greenhouse gas by mass among common pollutants.
Question 3: What is the primary treatment goal of a constructed wetland used for wastewater polishing?
- Removal of dissolved metals through precipitation
- Reduction of pathogens and nutrients via biological and physical processes (Correct answer)
- Incineration of organic micropollutants
- Desalination of brackish wastewater
Correct answer: Reduction of pathogens and nutrients via biological and physical processes
Constructed wetlands remove nutrients, pathogens, and suspended solids through a combination of sedimentation, plant uptake, and microbial activity.
Question 4: Which NPDES permit provision requires industrial dischargers to use the most stringent effluent limitation between technology-based and water quality-based standards?
- Anti-backsliding provision
- Anti-degradation policy (Correct answer)
- Effluent limitation guideline (ELG)
- Best Professional Judgment (BPJ)
Correct answer: Anti-degradation policy
The anti-degradation policy requires that the more stringent of technology-based or water quality-based effluent limits be applied to protect receiving water quality.
Question 5: In solid waste management, what does the term 'integrated waste management' prioritize as the most preferred option in its hierarchy?
- Recycling
- Composting
- Source reduction (waste prevention) (Correct answer)
- Landfilling
Correct answer: Source reduction (waste prevention)
Source reduction—reducing the amount of waste generated at the source—is the most preferred option in the EPA's integrated waste management hierarchy.
Question 6: What type of pollution control strategy involves modifying industrial processes to prevent waste generation rather than treating it after the fact?
- End-of-pipe treatment
- Pollution prevention (P2) (Correct answer)
- Dilution and dispersion
- Monitored natural attenuation
Correct answer: Pollution prevention (P2)
Pollution prevention focuses on eliminating or reducing pollutants at the source through process changes, material substitutions, or operational improvements.
Question 7: Which remediation technology uses zero-valent iron (ZVI) to chemically reduce chlorinated solvents in contaminated groundwater?
- Air sparging
- Thermal desorption
- Permeable reactive barrier (PRB) (Correct answer)
- Monitored natural attenuation
Correct answer: Permeable reactive barrier (PRB)
Permeable reactive barriers containing zero-valent iron intercept groundwater plumes and chemically reduce chlorinated compounds like TCE to less harmful byproducts.
CES Pollution Control & Waste Management 3
The Toxicity Characteristic Leaching Procedure (TCLP) is used to determine if a waste is hazardous.
What does this test simulate?