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Environmental Engineering

Environmental Engineering
If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

4000
1,00,000
1000
4,00,000

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

Ultra violet rays treatment
Chlorination
By using potassium permanganate
Lime treatment

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Environmental Engineering
The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by

TOD > BOD > COD
TOD > COD > BOD
COD > BOD > TOD
BOD > COD > TOD

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Environmental Engineering
Settling velocity increases with

Temperature of liquid
Depth of tank
Size of particles
Specific gravity of solid particles

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Environmental Engineering
The percentage of filtered water, which is used for backwashing in rapid sand filters, is about

0.2 to 0.4
5 to 7
0.4 to 1.0
2 to 4

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

Grit chambers
Sedimentation tanks
Detritus tanks
Skimming tanks

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