. During sewage treatment the primary effluent is agitated and aerated in large tanks, why?


(a)        To grow microbes that feed on effluent matter

(b)       To destroy microbes that are present in the effluent

(c)        To remove toxic chemicals present in the effluent 

(d)       To settle down the particulate matter present in it.

Best Answer

(a)        Agitation and aeration of primary effluent is done to increase the concentration of dissolved oxygen, which promotes the growth of micro-organisms that remove organic material.

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