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Waste Water Engineering

Waste Water Engineering
Fresh sewage is generally

A source of objectionable odour
Alkaline
Highly decomposed
Acidic

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Waste Water Engineering
In normal conditions, the period for sludge digestion, is

60 days
30 days
20 days
10 days

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

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

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

15 days
90 days
60 days
30 days

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Waste Water Engineering
A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is

2.40 m
2.50 m
2.30 m
2.45 m

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

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