In the present investigation we have studied the effects of static magnetic field on removal of organic compounds and ammonium nitrogen by high loading activated sludge. The research was carried out on laboratory scale at room temperature. Three or two continuously operating test systems were used in the experiment. In two test systems the return activated sludge was exposed to magnetic field strength of 20 mT or 40 mT. The magnets were attached to a pipe used for activated sludge recirculation. The nitrification rate for test systems when the return activated sludge was exposed to magnetic field was higher than for control system in absence of magnetic field. The best data was observed for test system which was exposed to magnetic field of 40 mT. The nitrification rate was 2 times higher than for control system when the loading of activated sludge was in the range of 0.6 to 0,9 g COD/gMLSS ·d for. The results show that magnetic field improves nitrification of domestic wastewater by high loading activated sludge.

In the present investigation we studied the effects of static magnetic field on transformation of organic compounds and ammonium nitrogen. The research was carried out on laboratory scale at room temperature. Two continuously operating test systems were run in parallel. In one of the systems the raw sewage was exposed to magnetic field strength of 180 mT. The magnets were attached to a pipe used for raw sewage. The second system was used as a control. The research was carried out without activated sludge and with activated sludge. The investigation carried out in an experiment without activated sludge showed that the removal of COD for system with the raw sewage exposed to magnetic field strength of 180 mT was 15% higher then system in absence of magnetic field. During investigation carried out in an experiment with activated sludge it was observed that the removal of COD was similar in both systems. The nitrification rate for system in which raw sewage was exposed to magnetic field was lower than the system in which it was not.