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Waste Water Engineering

Waste Water Engineering
Which one of the following resists hydrogen sulphide corrosion?

Asbestos cement
R.C.C.
Glazed stone wares
Glazed ware

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Waste Water Engineering
Self-cleansing velocity is

Velocity at dry weather flow
Velocity at which no accumulation remains in the drains
Velocity of water in a pressure filter
Velocity of water at flushing

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Waste Water Engineering
Clogging of sewers, is caused due to

Greasy and oily matters
All of these
Low discharge
Silting

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Waste Water Engineering
The normal values of over flow rates for secondary sedimentation tanks, ranges between

80,000 to 10,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
50,000 to 60,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day

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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) d [(3T + 70)/100]
Vs = 418 (Gs – Gw)d² [(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
If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is

1.5 D
1.75 D
1.15 D
1.25 D

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