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Waste Water Engineering

Waste Water Engineering
In septic tanks, decomposition of organic bacteria, is done by

Aerobic bacteria
Both types of bacterias
None of these
Anaerobic bacteria

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Waste Water Engineering
If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is

3 hours
4 hours
5 hours
2 hours

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Waste Water Engineering
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

8 hours
2 hours
6 hours
4 hours

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Waste Water Engineering
The drop man holes are generally provided in sewers for

Hilly town ships
Industrial areas
Cities in plains
Large town ships

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Waste Water Engineering
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is

1 in 100 upward
1 in 500 upward
1 in 503 upward
1 in 100 downward

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Waste Water Engineering
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of

15°C
0°C
25°C
20°C

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