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Waste Water Engineering

Waste Water Engineering
The small sewers are cleaned by

Flushing
Cane rodding
None of these
Wooden pills

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Waste Water Engineering
For design of sewers, percentage of sewage discharge is assumed

70 to 75%
0.85
65 to 70%
75 to 80%

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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
40,000 to 50,000 litres/sqm/day
80,000 to 10,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day

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Waste Water Engineering
Sludge banks are formed if sewage is disposed of in

Seas
None of these
Rivers
Lakes

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Waste Water Engineering
In a sludge tank, the gas mainly produced, is

Carbon dioxide
Nitrogen
Oxygen
Hydrogen

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Waste Water Engineering
For detecting the nitrates in sewage, the colour may be developed by adding

None of these
Sulphuric acid and napthamine
Phenol-di -sulphuric acid and potassium hydroxide
Potassium permanganate

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