How does activated sludge get produced …
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Yogita Ingle 6 years, 3 months ago
The effluent formed from the primary treatment by filtration and sedimentation is passed to aeration tank for secondary treatment. In aeration tank, the air is pumped with constant agitation that causes vigorous growth of bacteria. This results in the formation of floc (Bacteria + Fungal filaments). The organic matter is consumed by bacteria that causes decrease in BOD of sewage.
BOD is the amount of oxygen required by bacteria to oxidise all the organic matter present in the effluent. Naturally, if organic matter decreases BOD also decreases and ultimately pollution decreases. When BOD and hence pollution is reduced, effluent is passed into a settling tank. Here, flocs settle down and it is known as
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