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Waste Water Engineering

Waste Water Engineering
A well oxidized sewage contains nitrogen mainly as

Nitrates
Nitrites
Free ammonia
None of these

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Waste Water Engineering
The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is

75 m
30 m
45 m
20 m

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Waste Water Engineering
Kjeldahl nitrogen is a mixture of

All listed here
Organic nitrogen and ammonia
Ammonia and nitrogen
Nitrogen and organic nitrogen

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Waste Water Engineering
In very first stage of decomposition of the organic matter in sewage

Ammonia is formed
Nitrates are formed
Carbondioxide is formed
Nitrites are formed

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Waste Water Engineering
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is

0.0556 cumec
0.05552 cumec
0.05554 cumec
0.05556 cumec

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

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