Waste Water Engineering
Skimming tanks are

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

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Waste Water Engineering
Which one of the following statements regarding septic tanks is wrong?

The outlet invert level is kept 5 to 7.5 cm below the inlet invert level
The depth of tank is kept equal to its width
The minimum width of septic level is 90 cm
A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided

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