Efflucent the primary treatment of sewage is passed for secondary treatment. Explain the process till the water is ready to be released into natural water bodies.
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During secondary treatment after adding small amount of inoculum, the primary effluent is constantly agitated mechanically in the aeration tank and air is pumped into it. This allows vigorous growth of useful microbes into flocs.
which consume major part of organic matter in the effluent. This results in reduction of BOD. The effluent is then passed into settling tank where the bacterial flocs are allow to sediment. Major part pf the activated sludge is pumped into anaerobic sludge digesters. During this digestion, bacteria produce the mixture of gases while the remaining water is released into natural water bodies.
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