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Environmental Engineering in CE

Environmental Engineering in CE
H₂S present in gaseous stream can be removed by adsorption on

Active carbon
Silica gel
Limestone powder
Bog iron

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Environmental Engineering in CE
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by

Filtration
Lagoons
Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)
Biological oxygen pond

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Environmental Engineering in CE
Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.

2000
500
1000
5

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Environmental Engineering in CE
Which is a secondary air pollutant?

Nitrogen dioxide
Photochemical smog
Sulphur dioxide
Dust particles

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Environmental Engineering in CE
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.

105
60
90
120

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Environmental Engineering in CE
Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?

Hydrogen
Carbon monoxide
Acetylene
Ammonia

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