Municipal wastewater treatment is a process to achieve sufficient water quality, which is usually done today using biological treatment. Although the process is optimised it still uses significant resources in its current form. IVL Swedish Environmental Research Institute has developed an innovative concept with potential to reduce use of resources, increase biogas production and achieve clean water. The method involves increased pre-precipitation to reduce the organic content as well as the load on the following membrane filtration with ultrafiltration and reverse osmosis, where water is cleaned for higher purity. The produced sludge is digested to produce biogas. The method has been tested at Hammarby Sjöstadsverk by IVL and as a part of a thesis project, performed by Súsanna Berg, KTH. The work was performed as a part of the project “Municipal Wastewater Treatment of Tomorrow- a production facility for utilities” partly financed by Swedish Vinnova. Main results are: Optimised pre-precipitation was able to separate the majority of the organic content and the efficiency is influenced by the choice of precipitation chemicals. The following membrane treatment was able to remove most of the remaining pollutants including nitrogen compounds. Thus it was possible to achieve a high degree of cleaning with this alternative approach. The results show the potential of the investigated method and further options for development of the method.