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Solids like faeces that settle at the bottom of the clarifier tank are called:

ASlurry
BScum
CGrit
DSludge
Answer & Solution
Correct answer: D. Sludge
1. A scraper removes them. 2. The settled solids are sludge. 3. It is later decomposed for biogas. _Source: syllabus Science, Chapter 18, Wastewater Story._
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