Waste Water Engineering
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is

0.05554 cumec
0.05556 cumec
0.0556 cumec
0.05552 cumec

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Waste Water Engineering
Which one of the following statements regarding septic tanks is wrong?

The depth of tank is kept equal to its width
The outlet invert level is kept 5 to 7.5 cm below the inlet invert level
A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
The minimum width of septic level is 90 cm

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Waste Water Engineering
Nitrogen cycle of sewage, is

Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia
Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates

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