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Waste Water Engineering

Waste Water Engineering
The ratio of minimum hourly flow to the average flow of sewage is

43832
43834
43833
43894

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Waste Water Engineering
As compared to fresh river water, sea water contains oxygen

20% less
10% more
10% less
20% more

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Waste Water Engineering
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of

90 days
30 days
15 days
60 days

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Waste Water Engineering
The coagulant which is generally not used for treating the sewage, is

Ferric chloride
Alum
Ferric sulphate
Chlorinated coppers

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

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Waste Water Engineering
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is

20 m
24 m
30 m
16 m

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