1. Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by





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MCQ->Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by....
MCQ->A waste water sample diluted to 100 times with aeration water had an initial dissolved oxygen (DO) of 7.0 mg/l and after 5 days of incubation at 20°C, the DO was zero. The BOD of waste water is :....
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