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Environmental Engineering in CE

Environmental Engineering in CE
The biological decomposition of organic substances in wastes controlled conditions is called

Incineration
Composting
Biological oxidation
None of these

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Environmental Engineering in CE
The pH value of potable water should be between

6.5 to 8
13 to 14
4 to 5
1 to 1.5

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Environmental Engineering in CE
Which of the following industries discharge mercury as a pollutant?

Chloro-alkali industry
Phosphoric acid plant
Tanneries
Beverage plant

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Environmental Engineering in CE
Which of the following processes is involved in the biochemical treatment of sewage effluents?

Oxidation
Dehydration
Fermentation
Reduction

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Environmental Engineering in CE
The amount of coagulant needed for coagulation of water increases with(i) Increase in turbidity of water(ii) Decrease in turbidity of water(iii) Increase in temperature of water(iv) Decrease in temperature of waterThe correct answer is

(ii) and (iv)
(i)and(iv)
(ii) and (iii)
(i) and (ii)

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Environmental Engineering in CE
Presence of bacteria in potable (drinking) water causes

Bad taste & colour
Turbidity
Disease
Bad odour

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