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Waste Water Engineering

Waste Water Engineering
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

3
2
1.5
2.5

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Waste Water Engineering
Lead acetate test in sewer manhole is done to test the presence of

Methane gas
Diesel vapours
Carbondioxide gas
Hydrogen sulphide

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Waste Water Engineering
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is

D’ = 0.84 D
D’ = 0.64 D
D’ = 0.74 D
D’ = 0.94 D

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Waste Water Engineering
Antisyphonage pipe is fitted

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

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Waste Water Engineering
In 1000 kg of sewage, the total solids approximate

1 kg to 2.0 kg
7.5 kg to 10 kg
5 kg to 7.5 kg
0.5 to 1.0 kg

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Waste Water Engineering
The maximum diameter of sewers adopted in the designs is

2.0 m
3.0 m
1.0 m
4.0 m

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