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Waste Water Engineering

Waste Water Engineering
The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is

1.36 m
0.88 m
0.68 m
1.76 m

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

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Waste Water Engineering
For house drainage minimum gradient is

1 in 10
1 in 80
1 in 400
1 in 60

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Waste Water Engineering
The effluent of a septic tank is

None of these
Fit for discharge into any open drain
Foul and contains dissolved and suspended solids
As good as that from a complete treatment

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

None of these
Trickling filters
Imhoff tanks
Sludge sedimentation tanks

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Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for

Unexpected increase in population
Large scale infiltration of storm water
Low estimates of the average and maximum flows
All listed here

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