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Dried sludge is used as

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Fuel

Cattle food

Waste material

Manure

answer is B.

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Detailed Solution

The treated sludge is taken out from the bottom of first sedimentation tank and put into large, closed tank called digestion tank. Here, many types of Anaerobic bacteria decompose the sludge to produce biogas. The dried sludge is used as a Manure

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