. A sewage treatment process in which a portion of the decomposer bacteria present in the waste is recycled into


the beginning of the process, is called

A. Bcyclic treatment

B. primary treatment

C. activated sludge treatment   

D. tertiary treatment

Best Answer

Solution ||| The word activated sludge system is derived from the practice of adding to the incoming sewage some of the sludge from a previous batch. This sludge inoculums contains large numbers of metabolizing vacteria, together with yeasts, moulds and Protozoa. An especially important ingredient of the sludge are species of Zoogloea bacteria, which form flocculant masses (floc) in the aeration tanks. The activity of these aerobic micro-organisms oxidizes much of the effluent’s organic matter into carbon dioxide and water. When the aeration phase is completed, the floc (secondary sludge) is allowed to settle to the bottom just as the primary sludge settle in primary treatment.

 

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