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Waste Water Engineering

Waste Water Engineering
Removal of oil and grease from sewage, is known

Filtration
Skimming
None of these
Screening

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Waste Water Engineering
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is

0.25
0.1
0.05
0.5

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Waste Water Engineering
In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is

[(100 – P1)/(100 – P2)] V1
[(100 + P1)/(100 – P2)] V1
[(100 – P1)/(100 + P2)] V1
[(100 + P2)/(100 – P1)] V1

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Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for

Large scale infiltration of storm water
All listed here
Unexpected increase in population
Low estimates of the average and maximum flows

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

25,000 to 35,000 litres/sqm/day
80,000 to 10,000 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
In SI units the power of sound is represented in

Watts
Kgs
Newtons
Joules

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