Over the last few years, there has been an increase in the volume of wastewater, which requires increased removal of biogenic elements in order to meet the requirements for acceptable values of wastewater pollution indicators. Wastewater treatment plants are developing new solutions also due to the reduction of investment and operating costs. Companies are looking for methods of highly efficient removal of nitrogen, phosphorus and carbon compounds, which will improve the quality of treated wastewater and also reduce electricity consumption. One of the primary processes used at treatment plants is nitrification, which is an aerobic process and has high energy consumption. Another process is denitrification, which involves the reduction of nitrification products under anoxic conditions to gaseous nitrogen and its removal from wastewater.