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WASTE WATER ENGINEERING

Waste Water Engineering
In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is

[(100 – P1)/(100 + P2)] V1
[(100 – P1)/(100 – P2)] V1
[(100 + P1)/(100 – P2)] V1
[(100 + P2)/(100 – P1)] V1

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Waste Water Engineering
The minimum diameter of sewer to be adopted is

10 cm
25 cm
15 cm
12.5 cm

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Waste Water Engineering
In a grit chamber of a sewage treatment plant,

Depth of 0.9 m to 1.20 m is kept
All of these
One minute of detention period is kept
Flow velocity 0.15 m to 0.3 m/sec is kept

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Waste Water Engineering
In a trickling filter

Filtration process is used
Both A and B
Neither A nor B
Biological action is used

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

Imhoff tanks
None of these
Sludge sedimentation tanks
Trickling filters

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