Which method reduces the final volume of waste by compacting it?

• A. Compaction
• B. Maceration
• C. Aeration
• D. Fermentation

Answer: (A)

The key idea is physically reducing the space waste takes up by applying pressure. Compaction squeezes the waste, removes some air, and packs everything tighter, so the same amount of waste takes up much less volume. This is a common, direct way to lower hauling and disposal space in landfills and waste processing facilities.

Maceration, by contrast, breaks solid waste into smaller pieces, often with moisture involved; it doesn’t necessarily cut the overall volume and can even add moisture, changing the weight more than the space.

Aeration adds air to promote biological breakdown, which can help decompose waste but doesn’t on its own compress the material into less volume.

Fermentation involves microbial processes that produce gases and break down contents, which can reduce volume indirectly, but it’s not the mechanical reduction of space that compaction achieves and it’s not the primary method used to minimize final waste volume through compression.