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Question

Which of the following is put into the anaerobic sludge digester for further sewage treatment?

A
Effluents of primary treatment
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B
Activated sludge
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C
Primary sludge
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D
Floating debris
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Solution

The correct option is B Activated sludge
Activated sludge is formed during secondary sewage treatment and it contains flocs of decomposer microbes. Major portion of activated sludge is pumped into large tanks called anaerobic sludge digesters. So, here other kinds of bacteria which grow anaerobically, digest the fungi, bacteria of the sludge along with other organic mass.

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