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Environmental Engineering in CE

Environmental Engineering in CE
A shallow pond in which the sewage is retained and biologically treated is called

Imhoff tank
Oxidation
Lagoon
Skimming tank

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Environmental Engineering in CE
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

Biological oxygen demand (BOD)
Relative stability
Oxygen ion concentration
Bacterial stability factor

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

Reverse osmosis
Adsorption
Electrolytic decomposition
Ion exchange technique

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Environmental Engineering in CE
High noise level in a chemical plant can be controlled by the

All of these
Path control of noise
Protection of operating personnel
Suppression of noise at the source itself

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Environmental Engineering in CE
World environment day is observed every year on the 5th of

September
December
June
July

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Environmental Engineering in CE
'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the

Industrial chimney exhaust
Automobiles exhaust
Photochemical reaction in polluted atmosphere
Burning of domestic fuel

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