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Waste Water Engineering

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

Industrial areas
Large town ships
Cities in plains
Hilly town ships

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Waste Water Engineering
The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is

1.36 m
0.88 m
1.76 m
0.68 m

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Waste Water Engineering
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is

1 hour
30 minutes
2 hours
1 hour and 30 minutes

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

25 litres
20 litres
15 litres
10 litres

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

25,000 to 35,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
80,000 to 100,000 litres/sqm/day
50,000 to 60,000 litres/sqm/day

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Waste Water Engineering
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is

250 mg/l
50 mg/l
150 mg/l
100 mg/l

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