CPWM Waste Treatment Technologies and Disposal Methods 3

Question 1

Which landfill gas component is primarily responsible for its energy recovery value?

Accepted Answer

Methane

Answer

Methane (approximately 50% of landfill gas by volume) is combustible and is the component harvested for energy recovery.

Question 2

Vitrification as a waste treatment method involves:

Accepted Answer

Encapsulating contaminants in a glass-like matrix using high-temperature melting

Answer

Vitrification uses extreme heat to melt waste and soil into a stable glass-like solid that immobilizes contaminants.

Question 3

What is 'bioreactor landfill' technology designed to do?

Accepted Answer

Accelerate waste decomposition by recirculating leachate and adding moisture to optimize microbial activity

Answer

Bioreactor landfills recirculate leachate and add moisture to accelerate biodegradation, increasing gas generation and waste settlement rates.

Question 4

Which of the following best describes 'deep well injection' as a waste disposal method?

Accepted Answer

Injecting liquid waste into porous rock formations deep below underground sources of drinking water

Answer

Deep well injection places liquid waste into geologically isolated porous formations well below any underground drinking water sources.

Question 5

The primary regulatory concern with co-disposal of industrial waste in municipal solid waste landfills is:

Accepted Answer

Potential leaching of toxic substances that could compromise liner systems and groundwater

Answer

Co-disposal raises concern that hazardous or toxic industrial waste could leach into and overwhelm the liner system, threatening groundwater.

(CPWM) Certified Professional in Waste Management Practice Test