Answer:
(b) Activated sludge microorganisms
need oxygen as they oxidize wastes to obtain energy for growth. Insufficient
oxygen will slow down or kill off aerobic microorganisms, make facultative
organisms work less efficiently and ultimately lead to the breakage of floes.
It
will also result in the production of the foul-smelling byproducts of anaerobic
decomposition. So, sufficient oxygen must always be maintained in the aeration
tank to ensure complete waste stabilization.
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