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Waste Water Engineering

Waste Water Engineering
R.M.O. expenses include

All of these
Operation expenses
Running expenses
Maintenance expenses

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Waste Water Engineering
The detention period for plain sedimentation water tanks, is usually

4 to 8 hours
16 to 24 hours
24 to 36 hours
8 to 16 hours

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

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

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Waste Water Engineering
Maximum permissible velocity 1.5 m/sec, is adopted in drains

Lined with stones
With beds of rocks and gravels
Neither A. nor B.
Both A. and B.

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Waste Water Engineering
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of

30 days
60 days
90 days
15 days

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Waste Water Engineering
If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of

Cleaner water
Recovery
Active decomposition
Degradation

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