Biomass wastes show a great potential as an energy source. The problems usually reside in the conversion of these unclean biomasses into a convenient fuel to produce heat and/or power. Sewage sludge from water waste treatment plant could be converted into a syngas in order to be used in cogeneration plants based on internal combustion engines, thus reducing their treatment and destruction costs by the production of electricity and heat used on site. The main challenge of the use of sludge for gasification resides in the high ashes content (>30%) in comparison with wood (<1%). To investigate the potential of the gasification for this type of high mineral matter content biomass, gasification of sludge was successfully tested in an industrial gasification pilot plant. This paper presents the results of two gasification campaigns using sludge from different processes mixed with wood in concentrations from 25 to 100%
