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Environmental Engineering in CE

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
Presence of nitrates in water in excess of 50 ppm causes

Tooth decay
Asphyxiation
Gastroentetitis
Mathenoglobenemia

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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
Lagooning
Activated carbon adsorption
Biological oxidation pond

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Environmental Engineering in CE
Water effluent generated in printing industry is decolourised by

Electrolytic decomposition
Adsorption
Reverse osmosis
Ion exchange technique

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Environmental Engineering in CE
Exposure to chemicals having carcinogenic properties cause

Dermatitis (skin disorder)
Asphyxiation (suffocation)
Cancer
Asthma

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Environmental Engineering in CE
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of

All of these
Chlorine or its compounds
Ultraviolet light for irradiation of water
Ozone and iodine

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