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Waste Water Engineering

Waste Water Engineering
The most efficient cross-section of sewers in a combined sewerage system is

Rectangular
Parabolic
Circular
New egged

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

0.6
0.5
0.55
0.45

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Waste Water Engineering
The gas evolved in sewers is

All of these
Hydrogen sulphide
Carbondioxide
Methane

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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

2
3
2.5
1.5

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Waste Water Engineering
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains

Carbon dioxide
Oxygen
Methane
Hydrogen sulphide

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Waste Water Engineering
In normal conditions, the period for sludge digestion, is

10 days
20 days
60 days
30 days

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