Waste Water Engineering
The clarigesters are

Circular Imhoff double storey tanks without bottom hoppers
Circular Imhoff double tanks with bottom hoppers
Rectangular septic tanks
Circular septic tanks

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Waste Water Engineering
Nitrogen cycle of sewage, is

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

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