Waste Water Engineering
For detecting the nitrites in the sewage, the matching colour may be developed by adding

Potassium permanganate
None of these
Phenol-di -sulphuric acid potassium hydroxide
Sulphuric acid and napthamine

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Waste Water Engineering
Dilution method of disposing of sewage, is not preferred to

When diluting water has high dissolved oxygen content
When diluting water is used for water supply near the point of sewage disposed
When sewage is fresh
When the diluting water is having flow currents

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