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Waste Water Engineering

Waste Water Engineering
The rate of accumulation of sludge per person per year, is

15 litres
10 litres
25 litres
20 litres

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Waste Water Engineering
The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known

Lateral sewer
House sewer
Branch sewer
Sewer outfall

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Waste Water Engineering
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is

250 mg/l
150 mg/l
50 mg/l
100 mg/l

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Waste Water Engineering
Disposal to sewage in large cities, is done in

Irrigation
Purification
Dilution
Oxidation

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Waste Water Engineering
With self cleansing velocity in sewers

Both silting and scouring occur at bottom
Neither silting nor scouring occurs at bottom
Silting occurs at bottom
Scouring occurs at bottom

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Waste Water Engineering
In detritus tanks,

Detention period is kept 3 to 4 minutes
Organic and inorganic materials are separated
All listed here
Flow velocity is kept 0.09 m/sec

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