14.4.3 Denitrification NO3+0.83CHOH→0.5N2+0.83C0,+1.17HO+OH 0.2 20 NaR NiR 0N2OR 0 0 2345 6 Dissolved oxygen concentration(mg/L) Effect of dissolved oxygen concentration on the relative activity of nitrate reductase (NaR),nitrite reductase (NiR)and nitrous oxide reductase (NO2R)of Pseudomonas nautica (Data from Bonin et al.Can.J.Microbiol.35,1061 (1989).− − NO3 +0.83CH3 OH →0.5N2 +0.83CO2 +1.17H2 O+OH 14.4.3 Denitrification