Waste Water Engineering
Pick up the incorrect statement from the following for allowing workers to enter sewers

Proper tests for the presence of poisonous gases must be carried out
Warning signals should be erected
The men entering the manhole should be advised to smoke in the sewer
The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes

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Waste Water Engineering
Nitrogen cycle of sewage, is

Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates
Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia

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

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

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