The domestic sewage in large cities

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(B) The domestic sewage in large cities undergoes secondary treatment in Sewage Treatment Plants $(STPs)$.In this process,the primary effluent is pass

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Is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plants $(STPs)$

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(B) The domestic sewage in large cities undergoes secondary treatment in Sewage Treatment Plants $(STPs)$.In this process,the primary effluent is passed into large aeration tanks where it is constantly agitated mechanically and air is pumped into it.This allows vigorous growth of useful aerobic microbes into flocs,which consume the major part of the organic matter in the effluent,significantly reducing the $BOD$.Once the $BOD$ of sewage is reduced,the effluent is passed into a settling tank where the bacterial flocs are allowed to sediment.This sediment is called activated sludge.$A$ small part of the activated sludge is pumped back into the aeration tank to serve as the inoculum,while the remaining major part is pumped into large tanks called anaerobic sludge digesters.In these digesters,other kinds of bacteria,which grow anaerobically,digest the bacteria and the fungi in the sludge,producing gases such as methane,hydrogen sulfide,and carbon dioxide.

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