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What is the minimum quantity of dissolved oxygen that should be present in the treated sewage?

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in Environmental Engineering by (81.4k points)
What is the minimum quantity of dissolved oxygen that should be present in the treated sewage?

(a) 6ppm

(b) 4ppm

(c) 1ppm

(d) 10ppm

The question was asked during an interview for a job.

Question is from Chemical Characteristics of Waste Water topic in section Wastewater Characteristics of Environmental Engineering

1 Answer

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Best answer
Right option is (b) 4ppm

Best explanation: At least, 4ppm of dissolved oxygen should be present in treating sewage otherwise, fishes will die due to lack of dissolved oxygen.

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