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Waste Water Engineering

Waste Water Engineering
The sewage treatment in septic tanks is due to

Aerobic decomposition
None of these
Anaerobic decomposition
Parasitic decomposition

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Waste Water Engineering
The normal values of over flow rates for sedimentation tanks using coagulant, ranges between

50,000 to 60,000 litres/sqm/day
80,000 to 100,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day

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Waste Water Engineering
The liquid wastes from kitchens, bath rooms and wash basins, is not called

Liquid waste
Sullage
Sewage
None of these

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Waste Water Engineering
To maintain aerobic biological activity, the moisture content of the compost mass should be about

0.5
0.6
0.45
0.55

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Waste Water Engineering
An inverted siphon is designed generally for

Two pipes
Four pipes
One pipe
Three pipes

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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

0.1
0.05
0.25
0.5

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