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Waste Water Engineering

Waste Water Engineering
Fresh sewage is generally

Acidic
Alkaline
A source of objectionable odour
Highly decomposed

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Waste Water Engineering
If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains

Hydrogen sulphide
Carbon dioxide
Oxygen
Methane

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Waste Water Engineering
The normal values of over flow rates for secondary sedimentation tanks, ranges between

50,000 to 60,000 litres/sqm/day
80,000 to 10,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day

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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

6 hours
4 hours
2 hours
8 hours

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Waste Water Engineering
The ratio of minimum hourly flow to the average flow of sewage is

43894
43834
43832
43833

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Waste Water Engineering
The ratio of design discharge to the surface area of a sedimentation tank is called

All of these
Overflow velocity
Overflow rate
Surface loading

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