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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

0.05
0.25
0.5
0.1

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Waste Water Engineering
1000 kg of sewage contains

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

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Waste Water Engineering
Cement concrete sewers are only suitable if non-scouring velocity is between

2.5 to 3.0 m/sec
3.0 to 4.0 m/sec
4.5 to 5.5 m/sec
3.5 to 4.5 m/sec

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Waste Water Engineering
It is customary to design a sewer for D.W.F. on the basis of

Thrice the average demand
Four times the average demand
Twice the average demand
Average demand

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

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

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Waste Water Engineering
Before discharging the foul sewage into rivers, it is generally treated by

All listed here
Screening
Sedimentation
Oxidation

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