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Environmental Engineering in CE

Environmental Engineering in CE
Main pollutants released from iron & steel industry is

CO₂, H₂S & NO₂
SO₃, NO₂ & CO₂
CO, CO₂ & SO₂
H₂S, NO & SO₃

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Environmental Engineering in CE
Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called

Mists
Fumes
Aerosols
Smoke

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Environmental Engineering in CE
In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.

1 to 2
15 to 20
4 to 5
9 to 10

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Environmental Engineering in CE
The principal gas evolved from sludge digestion tank is

CH₄
CO₂
N₂
CO

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Environmental Engineering in CE
Infective bacteria in water is killed by the __________ process.

Aeration
Sterilisation
None of these
Disinfection

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Environmental Engineering in CE
Which is a secondary air pollutant?

Dust particles
Sulphur dioxide
Nitrogen dioxide
Photochemical smog

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