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  4. The supernatant left after sedimentation of sewage water during primary treatment is known as

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Q. The supernatant left after sedimentation of sewage water during primary treatment is known as

NTA AbhyasNTA Abhyas 2020Microbes in Human Welfare

Solution:

Primary treatment is a physical process which involves filteration and sedimentation. After sedimentation the part which settles down is called as primary sludge and the water which comes above is called effluent, it contains dissolved organic substance and is transferred to secondary treatment plant.