Waste Water Engineering
In very first stage of decomposition of the organic matter in sewage

Carbondioxide is formed
Nitrates are formed
Nitrites are formed
Ammonia is formed

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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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