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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

0.25
0.1
0.05
0.5

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Waste Water Engineering
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is

2
4
3
1.5

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Waste Water Engineering
The gas evolved in sewers is

Methane
All of these
Hydrogen sulphide
Carbondioxide

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Waste Water Engineering
For sewers, inverted siphon is provided for

One pipe
Four pipes
Three pipes
Two pipes

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Waste Water Engineering
Bottom openings 15 cm × 15 cm in the standing baffle wall are provided

22.5 cm c/c
30 cm c/c
15 cm c/c
50 cm c/c

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Waste Water Engineering
A circular sewer section is preferred to because

It provides maximum area for a given perimeter
All listed here
It is cheaper in construction
It provides maximum hydraulic mean depth

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