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Environmental Engineering

Environmental Engineering
The velocity of flow of water in a sedimentation tank is about

15 to 30 cm/sec
5 to 10 cm/sec
15 to 30 cm/minute
15 to 30 cm/hour

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Environmental Engineering
The gas from sludge digestion tank is mainly composed of

Hydrogen sulphide
Methane
Carbon dioxide
Nitrogen

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Environmental Engineering
The type of valve, which is provided on the suction pipe in a tube-well, is

Sluice valve
Reflux valve
Air relief valve
Pressure relief valve

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Environmental Engineering
The pathogens can be killed by

Oxidation
Nitrification
Chlorination
None of these

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Environmental Engineering
Turbidity is measured on

Standard platinum scale
Standard silica scale
Standard cobalt scale
Platinum cobalt scale

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Environmental Engineering
The effective size of sand particles used in slow sand filters is

0.25 to 0.35 mm
0.60 to 1.00 mm
1.00 to 1.80 mm
0.35 to 0.60 mm

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