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Waste Water Engineering

Waste Water Engineering
The digested sludge from septic tanks, is removed after a maximum period of

3.5 years
3 years
5 years
4 years

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Waste Water Engineering
Antisyphonage pipe is fitted

At the beginning of sewer line
On manholes
With a W.'trap
At the end of septic tanks

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Waste Water Engineering
Dry weather flow is:

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

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Waste Water Engineering
pH value of sludge during alkaline regression stage, is

More than 7
Less than 6
More than 6
Less than 7

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Waste Water Engineering
For design purposes, the normal rate of infiltration of ground water into the sewer, is

1000 litres/km/cm
1500 litres/km/cm
500 litres/km/cm
2000 litres/km/cm

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Waste Water Engineering
For large sewers, maximum distance between manholes may be

200 m
300 m
100 m
50 m

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