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.