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Waste Water Engineering

Waste Water Engineering
The rate of accumulation of sludge per person per year, is

10 litres
15 litres
20 litres
25 litres

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Waste Water Engineering
The formula V = (1/n) r2/3

Bazin’s formula
Manning’s formula
Kutter’s formula
Chezy’s formula

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Waste Water Engineering
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is

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

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Waste Water Engineering
A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of

Petrol vapours
Carbondioxide gas
Methane gas
Hydrogen sulphide gas

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Waste Water Engineering
For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of

HNO₃
None of these
HCl
H₂SO₄

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Waste Water Engineering
Dry weather flow is:

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

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