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  1. In trickling filter, B.O.D. is reduced to

    2. A.

    30 to 40%
    B.

    40 to 60%
    C.

    60 to 80%
    D.
    80 to 90%
    E.

    95%.

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    Workspace

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    Answer : Option C

    Explanation :

    No answer description available for this question.

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