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Explain different stages involved in sew...

Explain different stages involved in sewage treatment.

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a. Aerobic and anaerobic bacterial exist in sewage water.
b. After the primary treatment aerobic bacteria will reduces BOD in aeration tanks by degrading oraganic matter.
c. Anaerobic bacteria are the sludge digesters, where these digest the sludge and form biogas.
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  2. Explain different stages involved in sewage treatment.

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