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(a) Three water samples A, B, C are collected. Their BOD was found to be 20mg/L, 8mg/L and 400mg/L respectively. Which sample is most polluted? Give reasons. (b) At which stage of sewage treatment is BOD of effluent reduced? [3] |
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Answer» (a) Three water samples A, B, C are collected. Their BOD was found to be 20mg/L, 8mg/L and 400mg/L respectively. Which sample is most polluted? Give reasons. (b) At which stage of sewage treatment is BOD of effluent reduced? [3] |
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