A study was undertaken on steam gasification of mixtures of wood pellets and biosolids (dried sewage sludge). The gasification experiments were conducted in a fast circulating dual fluidised bed gasifier. In the experiments, the gasification temperature was set at 720 degrees C and the fuel feeding rate to the gasifier was 15.5 kg/h (as received). The biosolids was blended with wood pellets, with biosolids to wood pellet mass proportion being controlled at 0% (or 100% wood pellets), 10%, 20%, 40%, 60%, 80% and 100%. From the results, the syngas produced from the biosolids had higher H-2 content (28%) compared with that from pure wood (23%), with the H-2 content increasing with biosolids fuel loadings. In addition, the ratio of H-2/CO increased from 0.6 to 0.9 as the biosolids loading increasing from 0% to 100%. However, the syngas yield and the cold gas efficiency of the gasification decreased dramatically by 53% and 43%, respectively, at 100% biosolids loading compared with 100% pure wood loading. Nevertheless, the increase from 10% to 20% loading of biosolids in the fuel did not diminish the yields and the cold gas efficiency. For gasification of pure biosolids, the gas concentrations of H-2 and CO in this study were found to be 40% higher than that produced by other researchers using air, O-2 or CO2/N-2 as the gasification agent. (C) 2011 Elsevier Ltd. All rights reserved.