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UPSC Civil Service Exam Questions - Engineering

Q1:

A municipal sewage has BOD5 of 200 mg/l. It is proposed to treat it and dispose off into a marine environment. For what minimum efficiency should the sewage treatment plant be designed ?

A 85%

B 60%

C 50%

D 33.67%

ANS:A - 85%

[BOD(in) - BOD(out)]/BOD(in)
[200-100]/200,
50.