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Waste Water Engineering

Waste Water Engineering
Imhoff cone is used to measure

Settleable solids
Total solids
Total organic solids
Total in organic solids

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Waste Water Engineering
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

Less than 0.05 mm
Greater than 0.1 mm
Less than 0.01 mm
Less than 0.1 mm

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

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

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Waste Water Engineering
In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is

5
15
20
10

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Waste Water Engineering
The following is the physical characteristic of sewage

Odour
Colour
Turbidity
All listed here

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Waste Water Engineering
In sewage having fully oxidised organic matter, the nitrogen exists in the form of

Aluminoid nitrogen
Free ammonia
Nitrites
Nitrates

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