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BOD of some water samples are given below:A. Sample 1 – 200 mg/LB. Sample 2 – 80 mg/LC. Sample 3 – 300 mg/LD. Sample 4 – 25 mgIL (a) Which of the above water sample is most polluted? (b) What is meant by floes ? What is its role in sewage treatment? |
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Answer» (a) Sample 4 (b) Floes- masses of bacteria associated with fungal laments to form mesh like structures. They consume the major part of the organic matter in the effluent. This is significantly reduces the BOD of the effluent. |
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