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

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

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Waste Water Engineering
Skimming tanks are

Tanks provided with self- cleansing screens
Used to remove the grease and oil
Improved version of grit chambers
Those from which sludge is skimmed out

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