Choose the correct sequence of events in treating the domestic sewage of cities and towns.

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Sequential filtration - Sedimentation to remove grit - Degradation of organic matter of effluent - Anaerobic digestion of flocs

Sequential filtration - Degradation of organic matter of effluent - Anaerobic digestion of flocs - Sedimentation to remove grit

Sedimentation to remove grit - Sequential filtration - Degradation of organic matter of effluent - Anaerobic digestion of flocs

Degradation of organic matter of effluent - Sequential filtration - Sedimentation to remove grit - Anaerobic digestion of flocs

answer is A.

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Detailed Solution

The sequential steps to treat the sewage of cities and towns is Sequential filtration to remove the floating debris - Sedimentation to remove grit as primary sludge - Degradation of organic matter of effluent in aeration tank by aerobic heterotrophs present in the effluent - Anaerobic digestion of flocs (aerobic fungi and bacteria) in anaerobic sludge digester.

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