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Waste Water Engineering

Waste Water Engineering
Imhoff cone is used to determine

Settleable solids
None of these
Dissolved solids
Suspended solids

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

43832
43833
43834
43894

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Waste Water Engineering
The normal value of over flow rates for plain primary sedimentation tanks, ranges between

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

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Waste Water Engineering
The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be

1.2 m
0.9 cm
1.5 m
> 1.5 m

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Waste Water Engineering
For a continuous flow type of sedimentation tanks

All listed here
Length of the tank is normally kept 4 to 5 times the width
Maximum horizontal flow velocity is limited to 0.3 m/minute
Width of the tank is normally kept about 6 m

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Waste Water Engineering
hydraulically equivalent, the relationship which holds good, is

D3/2 = 4 b3/2
D8/3 = 4 b8/3
D2/3 = 4 b2/3
D3/8 = 4 b3/8

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