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Environmental Engineering in CE

Environmental Engineering in CE
Algae growth in water is controlled by

Chlorination
Deoxidation
Bleaching
Aeration

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Environmental Engineering in CE
__________ substances present in sewage are removed in grit chamber during sewage treatment.

Organic
Dissolved
Fatty
Inorganic

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Environmental Engineering in CE
Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?

Chemical coagulation
Activated carbon adsorption
Biological oxidation pond
Lagooning

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Environmental Engineering in CE
Out of the following, TLV of __________ is the minimum (about 0.02 ppm).

Ozone
Phosgene
Bromine
MIC (methyl iso-cynate)

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Environmental Engineering in CE
Hydrogen ion concentration in distilled water is

7 x 10⁷
10⁷
7 x 10⁻⁷
10⁻⁷

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Environmental Engineering in CE
Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes

Explosion hazards
Depletion of dissolved oxygen
Fire hazards
Persistent foam

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