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Waste Water Engineering

Waste Water Engineering
If the grit in grit chambers is 4.5 million litres per day, its cleaning is done

Mechanically
Hydraulically
Electrically
Manually

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Waste Water Engineering
In a fully mechanised composting plant, involves

Mechanized segregation
All of these
Mechanized receipt
Mechanized pulverising of refuse

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Waste Water Engineering
Inter-distance between ventilation columns in a sewer line is kept

50 m to 100 m
100 m to 150 m
150 m to 300 m
25 to 50 m

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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

0.10 cumec
0.12 cumec
0.20 cumec
0.15 cumec

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

3 years
5 years
3.5 years
4 years

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Waste Water Engineering
A well oxidized sewage contains nitrogen mainly as

None of these
Free ammonia
Nitrates
Nitrites

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