title: Nitrification of industrial waste-waters with high nitrogen concentration in aerated packed-bed reactors.
abstract: The use of a two-step aerated packed-bed reactor yielded 99% nitrification of inorganic nitrogenous wastes carrying 800 to 1,300 mg N/l (COD of the wastes 55 mg O2/1). The beds were aerated with air enriched in CO2 pH values between the units were routinely adjusted. The efficiency of nitrification was 33 mg N/l/h. A change of the composition of the wastes to nitrogenous-organic (COD 1,200 mg O2/l) caused a drop in the efficiency of nitrification to 24 mg N/l/h and the subsequent introduction of a three-step system. Concomitant COD reduction was 85% with 73% reduction occurring in the first bed. The number of auto- and heterotropic bacteria in the nitrogenous-organic wastes and effluents from the separate beds were determined.
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D002245:Carbon Dioxide / Q000378:metabolism; D009566:Nitrates / Q000378:metabolism*; D009573:Nitrites / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism; D000644:Quaternary Ammonium Compounds / Q000378:metabolism; D012722:Sewage; D014508:Urea / Q000378:metabolism; D014865:Waste Disposal, Fluid
chemical_list: D009566:Nitrates; D009573:Nitrites; D000644:Quaternary Ammonium Compounds; D012722:Sewage; D002245:Carbon Dioxide; D010758:Phosphorus; D014508:Urea; D009584:Nitrogen