Waste Water Engineering
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called

Trickling filters
None of these
Sludge sedimentation tanks
Imhoff tanks

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Waste Water Engineering
Skimming tanks are

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

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