CPWM CPWM Composting and Organic Waste Management Questions and Answers

Question 1

What carbon-to-nitrogen (C:N) ratio is generally considered optimal for active composting?

Accepted Answer

25–30:1

Answer

10:1

Answer

60:1

Answer

5:1

Question 2

Which composting method uses earthworms to break down organic material?

Accepted Answer

Vermicomposting

Answer

Windrow composting

Answer

Aerated static pile

Answer

In-vessel composting

Question 3

What is the primary purpose of turning a windrow compost pile?

Accepted Answer

To aerate the pile and redistribute heat

Answer

To add moisture

Answer

To compact the material

Answer

To reduce the C:N ratio

Question 4

Under the EPA's Part 503 biosolids rule, what minimum temperature must Class A compost reach to meet pathogen reduction standards?

Accepted Answer

55°C for 15 days

Answer

45°C for 3 days

Answer

70°C for 30 minutes

Answer

80°C for 1 hour

Question 5

Which gas produced during anaerobic decomposition of organic waste is a potent greenhouse gas?

Accepted Answer

Methane

Answer

Carbon dioxide

Answer

Nitrogen oxide

Answer

Hydrogen sulfide

Question 6

What is 'food waste diversion' in the context of organic waste management?

Accepted Answer

Redirecting edible or compostable food from landfill to beneficial use

Answer

Shipping food scraps to another state

Answer

Separating food waste from recyclables at a MRF

Answer

Burning food waste for energy