Toxic Effect of Ammonium Nitrogen on the Nitrification Process and Acclimatisation of Nitrifying Bacteria to High Concentrations of NH4-N in Wastewater

The aim of the conducted research was to assess effectiveness nitrification process, at different concentrations ammonium nitrogen, in biologically treated wastewater one largest municipal and industrial treatment plants Poland. studies also attempted acclimate nitrifying bacteria limited concentration nitrogen determined efficiency under influence acclimated activated sludge biological system. obtained results indicate that above 60.00 mg·dm−3 inhibits nitrification, even after increasing biomass nitrifiers. increase process tested system can be by using inoculated with For this purpose, nitrifiers should preacclimated, least for a period time, allowing them colonize sludge. allows reducing amount sewage approx. 35.0%. stable observed nine days introducing into aeration chamber.