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Waste Water Engineering

Waste Water Engineering
In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is

15
20
5
10

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Waste Water Engineering
A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is

0.40 m/sec
0.45 m/sec
0.35 m/sec
0.30 m/sec

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Waste Water Engineering
The sludge does not contain waste water from

Toilets
Bath rooms
Kitchen sinks
Wash basins

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Waste Water Engineering
The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is

Vs = 218 (Gs – Gw)d² [(3T + 70)/100]
Vs = 418 (Gs – Gw)d² [(3T + 70)/100]
Vs = 418 (Gs – Gw) d [(3T + 70)/100]
Vs = 218 (Gs – Gw)d [(3T + 70)/100]

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

Pneumatic ejector
Air pressure pump
Reciprocating pump
Centrifugal pump

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Waste Water Engineering
A sewer running partially full and hurried with back filled, fails in compression due to

Superimposed traffic loads
Weight of the back fill
All listed here
Weight of the pipe

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