Waste Water Engineering
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains

Carbon dioxide
Oxygen
Methane
Hydrogen sulphide

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Waste Water Engineering
Dilution method of disposing of sewage, is not preferred to

When sewage is fresh
When diluting water has high dissolved oxygen content
When diluting water is used for water supply near the point of sewage disposed
When the diluting water is having flow currents

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