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Waste Water Engineering

Waste Water Engineering
In sewage, the solids in mg per litre is

1000 to 1500
1500 to 2000
500 to 1000
100 to 500

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Waste Water Engineering
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is

1.075
1.095
1.065
1.085

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Waste Water Engineering
In sewers the effect of scouring is more on

All sides
Horizontal side
Top side
Bottom side

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Waste Water Engineering
The rate of accumulation of sludge in septic tanks is recommended as

25 litres/person/year
30 litres/person/year
25 litres/person/month
30 litres/person/month

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Waste Water Engineering
The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is

Vs = 418 (Gs – Gw)d² [(3T + 70)/100]
Vs = 418 (Gs – Gw) d [(3T + 70)/100]
Vs = 218 (Gs – Gw)d [(3T + 70)/100]
Vs = 218 (Gs – Gw)d² [(3T + 70)/100]

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

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

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