SWANA Landfill Gas Management

Question 1

What is the primary component of landfill gas (LFG) produced during anaerobic decomposition?

Accepted Answer

Methane

Answer

Carbon dioxide

Answer

Nitrogen

Answer

Hydrogen sulfide

Question 2

What does NSPS stand for in the context of EPA landfill gas regulations?

Accepted Answer

New Source Performance Standards

Answer

National Site Pollution Standards

Answer

National Solid Permit System

Answer

Non-point Source Prevention Standards

Question 3

Under EPA regulations, MSW landfills above what design capacity threshold must install a gas collection and control system (GCCS) if NMOC emissions exceed 34 Mg/yr?

Accepted Answer

2.5 million Mg

Answer

1 million Mg

Answer

5 million Mg

Answer

10 million Mg

Question 4

What is the typical methane concentration range found in landfill gas?

Accepted Answer

40–60%

Answer

10–20%

Answer

25–35%

Answer

70–90%

Question 5

In an active LFG collection system, what is the primary function of the blower/vacuum pump unit?

Accepted Answer

Create negative pressure to draw gas from extraction wells

Answer

Heat the gas to prevent condensation

Answer

Filter trace volatile organic compounds

Answer

Monitor gas composition in real time

Question 6

What is the primary purpose of a knockout pot (condensate trap) installed in an LFG collection system?

Accepted Answer

Remove moisture and liquid condensate from the gas stream

Answer

Measure the volumetric gas flow rate

Answer

Add odorant for leak detection

Answer

Compress the gas for pipeline injection

Question 7

Which trace gas in landfill gas is primarily responsible for odor complaints at and near landfill facilities?

Accepted Answer

Hydrogen sulfide

Answer

Methane

Answer

Nitrogen

Answer

Carbon dioxide