name the by -product formed after secondary treatment of sewage. write their advantages
Answers
Explanation:
Secondary treatment or Biological treatment:
In secondary treatment primary effluent is passed into large acration tanks where iti is constantantly agitated mechanically and air is pumped to it.
Due to this useful aerobic microbes grow rapidly and form flocs. While growing, these microbes consume the major part of the organic matter in the effluent.
This significantly reduces the BOD of the effluent. BOD is a measure of the organic matter present in the water. The greater the BOD of waste water, more is its polluting potential.
When BOD of sewage or waste water is reduced, the effluent is then passed into Settling tank where the bacteria flocs allowed to sediment. This sediment is called activated sludge.
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