Waste Water Engineering
Aerobic bacterias

Oxidise organic matter in sewage
All of these
Consume organic matter as their food
Flourish in the presence of free oxygen

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Waste Water Engineering
Nitrogen cycle of sewage, is

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

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Waste Water Engineering
Skimming tanks are

Those from which sludge is skimmed out
Improved version of grit chambers
Used to remove the grease and oil
Tanks provided with self- cleansing screens

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