Dried sludge is used as:

Manure

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Source for biogas

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Fertilizers

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Both A and B

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Solution

The correct option is 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.
Hence, the correct answer is 'A'.

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