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

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

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Waste Water Engineering
The sewer pipes

Carry sewage as gravity conduits
Should resist the wear and tear caused due to abrasion
Are designed for generating self-cleansing velocities at different discharge
All listed here

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