The BOD removal efficiency, in percentage, during primary treatment, under normal conditions is about

The BOD removal efficiency, in percentage, during primary treatment, u

1.	The BOD removal efficiency, in percentage, during primary treatment, under normal conditions is about
A.	65%
B.	85%
C.	30%
D.	Zero
Answer» D. Zero

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The BOD removal efficiency, in percentage, during primary treatment, under normal conditions is about

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