what is the function of aeration tank in treatment of sewage?
Treatment of sewage is carried out in two stages: Primary treatment and Secondary treatment.
aeration tanks are used in secondary treatment, there main function is to allow the vigorous growth of useful aerobic microbes into flocs (masses of bacteria associated with fungal filaments in mesh like structures) by constantly agitating primary effluent and pumping air into it. These microbes further consume the major part of the organic matter in the effluent thus treating the effluent.