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Distinguish between the roles of flocs and anaerobic sludge digesters in selvage treatments. 

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S.No. Flocs Anaerobic Sludge Digester
(i) Breakdown organic matter aerobically. Breakdown organic matter anaerobically.
(ii) Breakdown organic matter present in primary effluent.  Breakdown organic matter in secondary effluent.
(iii) They do not produce biogas. They produce biogas (mixture of methane, H2S and CO2).

Detailed Answer:

Flocs are the mixtures of heterotrophic aerobic microbes that grow in aeration tank during secondary treatment of effluent. They consume a major part of the organic matter of the effluent. In anaerobic sludge digesters, anaerobic bacteria grow and digest the rest of the organic compounds and produce biogas.

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