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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

10
15
5
20

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Waste Water Engineering
An inverted siphon is designed generally for

Two pipes
One pipe
Three pipes
Four pipes

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Waste Water Engineering
Dry weather flow is:

Average annual rate of flow
Average monthly rate of flow
Water supply allowance per capita
Average daily rate of flow

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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
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

10000
1000
5000
100

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Waste Water Engineering
Self-cleansing velocity is

Velocity at which no accumulation remains in the drains
Velocity of water at flushing
Velocity at dry weather flow
Velocity of water in a pressure filter

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