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Waste Water Engineering

Waste Water Engineering
For house drainage minimum gradient is

1 in 10
1 in 60
1 in 400
1 in 80

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Waste Water Engineering
The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is

212 cu.m
208 cu.m
216 cu.m
204 cu.m

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

50,000 to 60,000 litres/sqm/day
80,000 to 100,000 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
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is

100 mg/l
400 mg/l
300 mg/l
200 mg/l

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Waste Water Engineering
The liquid wastes from kitchens, bath rooms and wash basins, is not called

Sewage
Liquid waste
None of these
Sullage

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Waste Water Engineering
A nuisance is experienced in diluting water if dilution factor is less than

20
60
100
40

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