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Environmental Engineering

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

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

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Environmental Engineering
In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be

100 ppm
300 ppm
400 ppm
200 ppm

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Environmental Engineering
The main disadvantage of oxidation pond is that

None of these
Large area is required for construction
BOD removal is very low
Maintenance and operation cost are high

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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
Which of the following values of pH represents a stronger acid?

5
4
3
2

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Environmental Engineering
In chlorination, with the rise in temperature of water, death rate of bacteria

Increases
Remains unaffected
Decreases
None of these

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