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Waste Water Engineering

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

200 m
150 m
300 m
100 m

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Waste Water Engineering
Primary treatment of sewage consists of removal of

Large suspended organic solids
Floating materials
Oil and grease
Sand and girt

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Waste Water Engineering
pH value of sludge during alkaline regression stage, is

Less than 6
Less than 7
More than 6
More than 7

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Waste Water Engineering
The normal values of over flow rates for sedimentation tanks using coagulant, ranges between

50,000 to 60,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
80,000 to 100,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day

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Waste Water Engineering
Dry weather flow is:

Average daily rate of flow
Average monthly rate of flow
Water supply allowance per capita
Average annual rate of flow

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Waste Water Engineering
The normal value of over flow rates for plain primary sedimentation tanks, ranges between

80,000 to 100,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
50,000 to 60,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day

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