Waste Water Engineering
The asbestos cement sewers are

Light in weight
Not structurally strong to bear large compressive stress
All of these
Susceptible to corrosion by sulphuric acid

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Waste Water Engineering
Skimming tanks are

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

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