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ENVIRONMENTAL ENGINEERING

Environmental Engineering
Period of cleaning of slow sand filters is about

24 - 48 hours
1 - 2 year
10 - 12 days
2 - 3 months

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Environmental Engineering
The characteristics of fresh and septic sewage respectively are

Alkaline and acidic
Both alkaline
Both acidic
Acidic and alkaline

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Environmental Engineering
For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as

6.5 to 8.0
10.5 to 12.0
4.5 to 6.0
8.5 to 10.0

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Environmental Engineering
The phenolic compounds in public water supply should not be more than

0.0001 ppm
0.001 ppm
0.1 ppm
0.01 ppm

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Environmental Engineering
The pathogens can be killed by

Nitrification
None of these
Chlorination
Oxidation

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