Waste Water Engineering
Skimming tanks are

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

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Waste Water Engineering
In septic tanks,

The baffles or tees are extended up to top level of scum
The clear space between the baffle top and covering slab is about 7.5 cm
All listed here
Free board of 0.3 m may be provided

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