Waste Water Engineering
The presence of free ammonia in sewage, is detected by

Boiling
Phenol-di-sulphuric acid
Adding potassium permanganate
Adding sulphuric acid

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Waste Water Engineering
Skimming tanks are

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

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