N03 188 H2c03 310

The conversion of 100 mg/l of ammonia nitrogen to nitrate-nitrogen according to equation (3.10) therefore yields about 17 mg/l of total nitrifying biomass. This relatively low yield has some far reaching consequences in the design of nitrification treatment plants, as will be seen in later sections.

The oxygen consumption ratios in equation (3.10) are 3.22 mg 02 per mg NH4+ -N oxidized and 1.11 mg 02 per mg N02" -N oxidized, respectively. This gives a total oxygen need of 4,32 mg 02 per mg NH4+ -N oxidized to N03" - N (Gujer and Jenkins 1974).

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