MCQ
Dried sludge is used as:
- ✓Manure
- BSource for biogas
- CFertilizers
- DBoth $A$ and $B$
✓
Answer
Correct option: A.
Manure
Activated sludge is formed as the suspended microbes settle at the bottom of the aerator tank.
This activated sludge is $97\%$ water and it is dried using sand drying beds or machines to obtain dried sludge.
Dried sludge is used as manure, returning organic matter and nutrients to the soil.
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