Environmental Engineering - Chemical Engineering Questions and Answers

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__________ is the process of killing organism in water.

Coagulation

Sterilisation

Disinfection

Sedimentation

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Reingleman chart No. 2 corresponds to __________ percent black smoke.

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Which of the following is a manmade source of air pollution ?

Automobile exhaust.

Forest fire.

Bacterial action in soil and swamp areas

All (a), (b) and (c).

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Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas ?

Packed scrubber

Gravity settling chamber

Electrostatic precipitator

Hydrocyclone

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Insufficient washing of sand grains in a rapid sand filter causes

air binding

shrinkage of filtering media

mud balls

expansion of filtering media

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Which of the following sources is responsible for maximum air pollution ?

Industrial chimney exhaust.

Forest fire.

Automobiles exhaust.

Photochemical oxidation of organic matter.

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Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?

Sedimentation tank

Circular clarifier

Mechanical flocculation

Chemical coagulation

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In sewage treatment, its sedimentation is speeded up by commonly adding

hydrochloric acid.

lime.

copper sulphate.

sodium sulphate.

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Noise level in a quiet private business office is about __________ decibels.