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Question
What is primary treatment of sewage?
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Solution
Filtration and sedimentation [Physical process] to remove floating debris and heavy particles respectively are primary treatment of sewage.
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RELATED QUESTIONS
Three water samples namely river water, untreated sewage water and secondary effluent discharged from a sewage treatment plant were subjected to BOD test. The samples were labelled A, B and C; but the laboratory attendant did not note which was which. The BOD values of the three samples A, B and C were recorded as 20 mg/L, 8 mg/L and 400 mg/L, respectively. Which sample of the water is most polluted? Can you assign the correct label to each, assuming the river water is relatively clean?
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If the above statement is correct then rewrite as it is and in case it is incorrect then reframe it.
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