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Waste Water Engineering

Waste Water Engineering
The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is

25 cm
20 cm
40 cm
50 cm

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

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Waste Water Engineering
The minimum recommended diameter of sewers, is

10 cm
5 cm
15 cm
20 cm

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Waste Water Engineering
The rate of accumulation of sludge in septic tanks is recommended as

30 litres/person/month
25 litres/person/month
25 litres/person/year
30 litres/person/year

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Waste Water Engineering
At the junction of sewers

Tops of both the sewers are at the same level
Top of larger sewer is kept lower
Top of smaller sewer is kept lower
None of these

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Waste Water Engineering
1000 kg of sewage contains

0.112 kg in suspension
0.225 kg in solution
Both A and C of above
0.112 kg in solution

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