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Waste Water Engineering

Waste Water Engineering
The factor responsible for purification of sewage in river is

Temperature
Hydrology
Dissolved oxygen in water
All listed here

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Waste Water Engineering
The digested sludge from septic tanks, is removed after a maximum period of

4 years
5 years
3 years
3.5 years

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Waste Water Engineering
In sewers the velocity of flow should not be

Less than the self-cleansing velocity
Less than 10 m/sec
More than the self-cleansing velocity
More than 20 m/sec

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Waste Water Engineering
Depletion of ozone layer in the outer atmosphere may cause

Skin cancer
Heart disorder
Lung cancer
Bronchitis

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Waste Water Engineering
The algae dies out in the zone of

Cleaner water
Degradation
Active decomposition
Recovery

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Waste Water Engineering
Ventilating shafts are provided to a sewer line at every

200 m
100 m
300 m
150 m

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