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Environmental Engineering

Environmental Engineering
If the sewage contains grease and fatty oils, these are removed in

Sedimentation tanks
Detritus tanks
Skimming tanks
Grit chambers

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Environmental Engineering
The effective size of sand particles used in slow sand filters is

0.35 to 0.60 mm
1.00 to 1.80 mm
0.25 to 0.35 mm
0.60 to 1.00 mm

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Environmental Engineering
The settling velocity of a particle in a sedimentation tank depends on

None of these
Surface area of tank
Depth of tank
Both depth and surface area of tank

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Environmental Engineering
Sewage treatment units are normally designed for

15 - 28 years
5 - 10 years
28 - 30 years
15 - 20 years

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Environmental Engineering
The suitable method for disinfection of swimming pool water is

Lime treatment
By using potassium permanganate
Chlorination
Ultra violet rays treatment

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Environmental Engineering
The process in which the chlorination is done beyond the break point is known as

Super chlorination
Pre-chlorination
Break point chlorination
Post chlorination

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