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Waste Water Engineering

Waste Water Engineering
The laying of sewers is done with

Clinometer
Theodolite
Magnetic compass
Level

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Waste Water Engineering
The sewer that unloads the sewage at the point of treatment is called

House sewer
Branch sewer
Outfall sewer
Main sewer

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Waste Water Engineering
Kjeldahl nitrogen is a mixture of

All listed here
Organic nitrogen and ammonia
Nitrogen and organic nitrogen
Ammonia and nitrogen

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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

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

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Waste Water Engineering
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is

0.15 cumec
0.20 cumec
0.10 cumec
0.12 cumec

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Waste Water Engineering
1000 kg of sewage contains

0.112 kg in solution
0.112 kg in suspension
Both A and C of above
0.225 kg in solution

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