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Waste Water Engineering

Waste Water Engineering
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is

0.5
0.05
0.25
0.1

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Waste Water Engineering
The rate of accumulation of sludge per person per year, is

20 litres
25 litres
15 litres
10 litres

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Waste Water Engineering
In sewers the velocity of flow should not be

More than 20 m/sec
Less than the self-cleansing velocity
Less than 10 m/sec
More than the self-cleansing velocity

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Waste Water Engineering
To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is

0.75 m/sec
0.60 m/sec
0.70 m/sec
0.50 m/sec

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Waste Water Engineering
In sewers designed with self cleansing velocity,

The bottom is scoured
The bottom is silted
Both silting and scouring occur at the bottom
Neither silting nor scouring occurs at the bottom

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Waste Water Engineering
The design period in years for pumping plants, is

5 to 10
3 to 5
1
2 to 3

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