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Waste Water Engineering

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

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

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Waste Water Engineering
The gas which may cause explosion in sewers, is

Carbon monoxide
Ammonia
Carbondioxide
Methane

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Waste Water Engineering
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

Less than 0.05 mm
Less than 0.01 mm
Greater than 0.1 mm
Less than 0.1 mm

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Waste Water Engineering
Large diameter sewers subjected to external pressure alone, are reinforced

Near the inner surface of the pipe
With elliptical cage
Both A and B
Near the outer surface of the pipe

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Waste Water Engineering
The grit chambers of sewage treatment plants, are generally cleaned after

2 days
14 days
7 days
12 days

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Waste Water Engineering
During purification process of sewage the gas given off, is

All listed here
Ammonia
Carbon dioxide
Hydrogen

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