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

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

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Waste Water Engineering
Skimming tanks are

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

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