Given below is the flowchart of sewage treatm | vedclass

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Question

(D) In sewage treatment,the effluent from the primary settling tank is passed into large aeration tanks $(A)$ where it is constantly agitated mechanic

Vedclass · Accepted Answer

$A-$Large aeration tank,$B-$Mechanical agitation,$C-$Reduced $BOD, D-$Activated sludge,$E-$Anaerobic sludge digesters

Vedclass · Answer

(D) In sewage treatment,the effluent from the primary settling tank is passed into large aeration tanks $(A)$ where it is constantly agitated mechanically $(B)$ and air is pumped into it.This allows vigorous growth of aerobic microbes into flocs,which consume the major part of the organic matter in the effluent,thereby significantly reducing the $BOD$ $(C)$.Once the $BOD$ of sewage or wastewater is reduced significantly,the effluent is passed into a settling tank where the bacterial 'flocs' are allowed to sediment. This sediment is called activated sludge $(D)$.$A$ small part of the activated sludge is pumped back into the aeration tank to serve as the inoculum. The remaining major part of the sludge is pumped into large tanks called anaerobic sludge digesters $(E)$.In these digesters,other kinds of bacteria,which grow anaerobically,digest the bacteria and the fungi in the sludge,producing gases like methane,hydrogen sulphide,and carbon dioxide,which form biogas.

Given below is the flowchart of sewage treatment. Identify $A, B, C, D$ and $E$ and select the correct option.

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