CRP Composting & Organics Recycling

Question 1

What temperature range must be maintained during the active composting phase to ensure pathogen destruction according to EPA standards?

Accepted Answer

55–65°C (131–149°F)

Answer

35–45°C (95–113°F)

Answer

70–80°C (158–176°F)

Answer

20–30°C (68–86°F)

Question 2

What is the recommended carbon-to-nitrogen (C:N) ratio for optimal composting?

Accepted Answer

25:1 to 30:1

Answer

5:1 to 10:1

Answer

50:1 to 60:1

Answer

100:1 to 150:1

Question 3

Which composting technology uses enclosed, mechanically aerated vessels to control temperature, moisture, and odors?

Accepted Answer

In-vessel composting

Answer

Windrow composting

Answer

Aerated static pile composting

Answer

Vermicomposting

Question 4

What is the primary distinction between aerobic and anaerobic composting processes?

Accepted Answer

Aerobic composting requires oxygen; anaerobic does not

Answer

Aerobic composting produces methane; anaerobic does not

Answer

Aerobic composting is always slower than anaerobic

Answer

Anaerobic composting consistently produces higher quality compost

Question 5

Which of the following is classified as a 'brown' or carbon-rich feedstock in composting?

Accepted Answer

Dry leaves and wood chips

Answer

Grass clippings

Answer

Fresh food scraps

Answer

Coffee grounds

Question 6

What characteristic best indicates that compost has reached maturity and is considered 'finished'?

Accepted Answer

It is biologically stable with no further significant decomposition and has a soil-like odor

Answer

It reaches its maximum internal temperature

Answer

It has a uniformly dark color with no recognizable feedstocks

Answer

It has been processed for a minimum of 90 days

Question 7

Which EPA regulation under the Clean Water Act establishes standards governing the land application of biosolids used in composting programs?

Accepted Answer

EPA 40 CFR Part 503

Answer

EPA 40 CFR Part 257

Answer

RCRA Subtitle D

Answer

EPA 40 CFR Part 261