Select the correct sequence of events in a sewage treatment process.
A. Passage of primary effluent into large aeration tanks for mechanical agitation and pumping of air.
B. Passage of effluent into the settling tank and formation of activated sludge.
C. Physical removal of particles through filtration and sedimentation.
D. Release of effluent from the secondary treatment plant into natural water bodies.
E. Growth of useful aerobic microbes into flocs which significantly reduce the BOD.
Physical removal of particles through filtration and sedimentation, Passage of primary effluent into large aeration tanks for mechanical agitation and pumping of air, growth of useful aerobic microbes into flocs which significantly reduce the BOD, growth of aerobic bacteria and fungi to form flocs and reducing BOD and release of effluent from secondary treatment plant into natural waters are sequential steps in sewage treatment.
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