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Waste Water Engineering

Waste Water Engineering
If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is

1.59 m
1.69 m
1.39 m
1.49 m

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Waste Water Engineering
For detecting the nitrates in sewage, the colour may be developed by adding

Phenol-di -sulphuric acid and potassium hydroxide
Sulphuric acid and napthamine
Potassium permanganate
None of these

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Waste Water Engineering
The most widely used pump for lifting sewage is

Pneumatic ejector
Reciprocating pump
Centrifugal pump
Air pressure pump

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

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Waste Water Engineering
For drainage pipes in buildings the test applied before putting them to use, is

All listed here
Water test
Straightness test
Smoke test

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Waste Water Engineering
The temperature affects the

Viscosity of sewage
Biological activity of bacteria in sewage
All of these
Solubility of gases in sewage

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