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Waste Water Engineering

Waste Water Engineering
Antisyphonage pipe is fitted

At the end of septic tanks
On manholes
With a W.'trap
At the beginning of sewer line

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Waste Water Engineering
Lead acetate test in sewer manhole is done to test the presence of

Carbondioxide gas
Methane gas
Diesel vapours
Hydrogen sulphide

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Waste Water Engineering
Self-cleansing velocity is

Velocity of water in a pressure filter
Velocity of water at flushing
Velocity at which no accumulation remains in the drains
Velocity at dry weather flow

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Waste Water Engineering
For sewers, inverted siphon is provided for

Four pipes
Two pipes
One pipe
Three pipes

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Waste Water Engineering
The drop man holes are generally provided in sewers for

Large town ships
Cities in plains
Industrial areas
Hilly town ships

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Waste Water Engineering
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

400 mg/l
100 mg/l
300 mg/l
200 mg/l

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