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Waste Water Engineering

Waste Water Engineering
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope

1 in 5
1 in 15
1 in 10
1 in 20

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Waste Water Engineering
In trickling filter, B.O.D. is reduced to

60 to 80%
80 to 90%
30 to 40%
40 to 60%

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Waste Water Engineering
When drainage to sewage ratio is 20, the peak dry weather flow is

Slightly less than 5% of the design discharge
None of these
Slightly more than 5% of the design discharge
20% of the design discharge

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Waste Water Engineering
The presence of free ammonia in sewage, is detected by

Adding potassium permanganate
Adding sulphuric acid
Boiling
Phenol-di-sulphuric acid

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

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

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Waste Water Engineering
The minimum recommended diameter of sewers, is

5 cm
20 cm
15 cm
10 cm

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