title: Effect of high concentrations of nitrogen on mixed populations of nitrifying bacteria isolated from industrial nitrogenous wastewaters.
abstract: The effect of high concentrations of different forms of nitrogen (NH4+, NO2-, NO3- and urea N) on nitrification by mixed populations of nitrosobacters isolated from nitrogen fertilizer plant wastewaters and nitrobacters isolated from effluents from a biological bed treating these wastewaters was determined. The inhibitory activity (within the concentration values for industrial wastewaters) of only the reaction products was observed, i.e. nitrites for nitrification phase I and nitrates for nitrification phase II. A mixed population of phase II nitrifying bacteria is highly resistant to high concentrations of ammonia nitrogen (50% inhibition at 3,000 mg N/l).
mesh_terms: D000641:Ammonia / Q000008:administration & dosage; D003470:Culture Media; D009566:Nitrates / Q000378:metabolism; D009573:Nitrites / Q000378:metabolism; D009576:Nitrobacter / Q000378:metabolism*; D009584:Nitrogen / Q000008:administration & dosage*; D010084:Oxidation-Reduction; D014508:Urea / Q000008:administration & dosage; D014865:Waste Disposal, Fluid; D014871:Water Microbiology
chemical_list: D003470:Culture Media; D009566:Nitrates; D009573:Nitrites; D000641:Ammonia; D014508:Urea; D009584:Nitrogen