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Waste Water Engineering

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

20°C
15°C
0°C
25°C

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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
40,000 to 50,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day

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Waste Water Engineering
The detention time (t) of a settling tank, may be defined as the time required for

A particle to travel along its length
A particle to travel from top surface to bottom sludge zone
None of these
The flow of sewage to fill the tank

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Waste Water Engineering
A well oxidized sewage contains nitrogen mainly as

Nitrates
None of these
Free ammonia
Nitrites

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Waste Water Engineering
The rate of accumulation of sludge per person per year, is

10 litres
20 litres
15 litres
25 litres

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Waste Water Engineering
The use of coarse screens for the disposal of sewage, may be dispensed with by

Both A and B
Comminutor
Shredder
Neither A nor B

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