CRP Composting & Organics Recycling 2

Question 1

What is vermicomposting?

Accepted Answer

The use of worms to decompose organic waste into nutrient-rich castings

Answer

Vermicomposting uses worms (typically red wigglers, Eisenia fetida) to consume and process organic waste, producing nutrient-rich worm castings as the primary end product.

Question 2

What is the primary greenhouse gas concern associated with organic waste disposed in landfills?

Accepted Answer

Methane generated from anaerobic decomposition

Answer

Organic waste in landfills decomposes anaerobically, generating methane, a potent greenhouse gas with approximately 28–36 times the global warming potential of CO₂ over a 100-year period.

Question 3

How does an 'aerated static pile' (ASP) composting system supply oxygen to the composting mass?

Accepted Answer

Perforated pipes connected to blowers force or draw air through a stationary pile

Answer

Aerated static pile composting supplies oxygen via perforated pipes connected to blowers that either force air into or draw air through the pile, eliminating the need for mechanical turning.

Question 4

Which of the following is a common contaminant found in residential curbside organics collection programs?

Accepted Answer

Plastic bags used to line collection containers

Answer

Plastic bags—even those marketed as 'compostable'—are a major contaminant in residential organics streams because they frequently fail to break down in commercial facilities and must be removed.

Question 5

What is the primary purpose of the 'curing' phase at the conclusion of the active composting process?

Accepted Answer

To allow continued stabilization and maturation of the compost product

Answer

The curing phase allows remaining unstable organic compounds to decompose further, reduces phytotoxic compounds, and ensures the compost is biologically stable and safe for plant application.

CRP - Certified Recycling Professional Practice Test

CRP - Certified Recycling Professional Practice Test

CRP Composting & Organics Recycling 2