TABLE 3.

Reactor performance during a 100-day period of constant loading^a

Effluent concn (mg liter−1)			NH4+-N oxidationb		N removal rates
NH4+-N	NO2−-N	NO3−-N	mg liter−1 day−1	mg m−2 day−1	%	mg liter−1 day−1	mg m−2 day−1
38 ± 38	8 ± 6	47 ± 11	1,135 ± 55	7,931 ± 376	89 ± 5	1,058 ± 60	7,390 ± 418

^aThe 100-day period corresponds to that labeled A in Fig. 1. This period was characterized by constant loading (1,189 mg of N liter⁻¹ day⁻¹ or 8,307 mg of N m⁻² day⁻¹). Values are given as mean ± standard deviation (n = 37). The influent NH₄⁺-N concentration was 840 mg of N liter⁻¹, and the flow rate was ca. 62 liters day⁻¹.

^bCalculated as the sum of aerobic and anaerobic ammonium oxidation.