Environmental Engineering in CE
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in

Municipal sewage treatment
Food industry
Iron & steel plant
Petroleum refinery

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Environmental Engineering in CE
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

Diluted with fresh water to reduce its acidity
None of these
Neutralised by alkali treatment
Left as such without any treatment

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Environmental Engineering in CE
On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because

Of jamming of respiratory tract
It forms CO₂ by combining with oxygen present in the blood
Of clotting of blood
It forms carboxyhaemoglobin by combining with haemoglobin of blood, thereby making it incapable of absorbing oxygen

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