5. Increased biogas from sewage sludge The aim of the project is to improve biogas production through research at the R & D facility in the “Hammarby Sjöstadsverk”. The improvements to be tested comprise dewatering sludge and finding of optimal process parameters. The goal is to increase the degree of digestion to over 60% and reducing the hydraulic retention time from 20 days to 10 days. Kåre Tjus Gdansk 20110908