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Waste Water Engineering

Waste Water Engineering
In sewage having fully oxidised organic matter, the nitrogen exists in the form of

Nitrites
Aluminoid nitrogen
Free ammonia
Nitrates

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Waste Water Engineering
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

10 ppm
5 ppm
4 ppm
3 ppm

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Waste Water Engineering
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?

None of these
Pneumatic ejector
Centrifugal pump
Reciprocating pump

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Waste Water Engineering
In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is

[(100 + P1)/(100 – P2)] V1
[(100 + P2)/(100 – P1)] V1
[(100 – P1)/(100 – P2)] V1
[(100 – P1)/(100 + P2)] V1

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Waste Water Engineering
1000 kg of sewage contains

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

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

5
20
10
15

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