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  1. If the efficiencies of BOD removal of first-stage and second-stage trickling filters are each 65.0%, then what is the overall BOD removal efficiency of these filters ?

    2. A.
    65%
    B.
    77.25%
    C.
    87.75%
    D.
    92.6%

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    Answer : Option C

    Explanation :

    No answer description available for this question. Let us discuss.

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