If the efficiencies of BOD removal of first stage and second stage tri – McqOptions

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1.	If the efficiencies of BOD removal of first stage and second stage trickling filters are each 65%, then what is the overall BOD removal efficiency of these filters?
A.	87.75%
B.	77.25%
C.	92.6%
D.	65%
Answer» B. 77.25%

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