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Waste Water Engineering

Waste Water Engineering
Chlorination of water is done for the removal of

Bacterias
Suspended solids
Hardness
Sediments

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Waste Water Engineering
The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is

Vs = 218 (Gs – Gw)d² [(3T + 70)/100]
Vs = 418 (Gs – Gw) d [(3T + 70)/100]
Vs = 418 (Gs – Gw)d² [(3T + 70)/100]
Vs = 218 (Gs – Gw)d [(3T + 70)/100]

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Waste Water Engineering
The spacing of bars of perforations of fine screens used for the treatment of sewage, is

8 to 10 mm
3 to 5 mm
2 to 3 mm
5 to 8 mm

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Waste Water Engineering
The spacing of bars for perforations in coarse screens used for the treatment of sewage, is

50 mm
40 mm
30 mm
20 mm

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Waste Water Engineering
Before discharging the foul sewage into rivers, it is generally treated by

Sedimentation
Oxidation
Screening
All listed here

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Waste Water Engineering
The following is the physical characteristic of sewage

Colour
Odour
All listed here
Turbidity

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