This work has been done with Ramboll Water, in cooperation with Eskilstuna Energi & Miljö (EEM), where the activated sludge process at Ekeby wastewater treatment plant (WWTP) has been themodeling object. The simulation study, using Sumo, shows that the nitrogen reduction using a separate digester supernatant treatment can be at most 3,7 mg/l, or 17 %, over a year when the maximum degree of treatment is assumed to be 90 %. With respect to the new emission requirements for Ekeby WWTP that starts in 2022, a 60 % degree of removal of the nitrogen in the supernatant is enough with unchanged population. With the 90 % nitrogen removal some room for a higher influent load might be possible. Business integration is elaborated applying quantitative and qualitative growth, learning and exploitation paired with model and model tool capability and a matrix combining assignment types and model tool functionality.Further studies in form of process capability and dynamic simulation is proposed.