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

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

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Waste Water Engineering
Skimming tanks are

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

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