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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

0.88 m
0.68 m
1.76 m
1.36 m

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Waste Water Engineering
The standard B.O.D. of water is taken for

1 day
5 days
3 days
2 days

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

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Waste Water Engineering
In septic tanks, decomposition of organic bacteria, is done by

None of these
Anaerobic bacteria
Aerobic bacteria
Both types of bacterias

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Waste Water Engineering
A well oxidized sewage contains nitrogen mainly as

Nitrates
Free ammonia
None of these
Nitrites

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Waste Water Engineering
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

d (0.285d + 0.011H)/Q
d (0.785d + 0.011H)/Q
d² (0.011d + 0.785H)/Q
d (0.022d + 0.085H)/Q

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