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Waste Water Engineering

Waste Water Engineering
The following is the physical characteristic of sewage

All listed here
Odour
Turbidity
Colour

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

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Waste Water Engineering
Before discharging the foul sewage into rivers, it is generally treated by

Oxidation
Sedimentation
All listed here
Screening

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

Mechanically
Hydraulically
Manually
Electrically

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Waste Water Engineering
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

1.5
2.5
3
2

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Waste Water Engineering
Aerobic bacterias

Flourish in the presence of free oxygen
Oxidise organic matter in sewage
Consume organic matter as their food
All of these

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