![]() While growing, the microbes significantly reduces the BOD (biochemical oxygen demand) which is the amount of oxygen required to oxidize total organic matter in the effluent.Flocs are the masses of bacteria associated with fungal filaments to form mesh like structures.The primary effluent is passed into large aeration tanks where it is constantly agitated which allows vigorous growth of useful aerobic microbes into flocs.Secondary treatment or biological treatment.The effluent from the primary settling tank is taken for secondary treatment.All solids that settle form the primary sludge, and the supernatant forms the effluent.Initially, floating debris is removed by sequential filtration and then the grit are removed by sedimentation.These treatment steps basically involve physical removal of large and small particles. ![]() ![]() Sewage treatment is carried out in two stages. Municipal waste-water which contains large amounts of organic matter is called sewage.īefore disposal, hence, sewage is treated in sewage treatment plants (STPs) by the heterotrophic microbes to make it less polluting. ![]()
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