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WASTE WATER ENGINEERING

Waste Water Engineering
In a sludge tank, the gas mainly produced, is

Nitrogen
Hydrogen
Oxygen
Carbon dioxide

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Waste Water Engineering
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is

1000
100
10000
5000

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Waste Water Engineering
The gas which may cause explosion in sewers, is

Carbondioxide
Ammonia
Carbon monoxide
Methane

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Waste Water Engineering
Sludge banks are formed if sewage is disposed of in

Lakes
Rivers
Seas
None of these

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

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

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