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Question

The sewage treatment process in which a portion of the decomposer bacteria present in the waste is recycled and reused in the beginning of the next round of the process is called


A
Cyclic treatment
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B
Primary treatment
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C
Activated sludge treatment
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D
Tertiary treatment
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Solution

The correct option is C Activated sludge treatment

The word “activated sludge system” is derived from the practice of adding the incoming sewage of the sludge from a previous batch. This sludge inoculum consists of large numbers of metabolising bacteria, together with yeasts, moulds and protozoa. An especially important ingredient of the sludge are species of Zoogloea bacteria, which form flocculent masses (floc) in aeration tanks. The activity of these aerobic microorganisms oxidises 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 settles in the primary treatment.


Biology

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