Alder chips, solid recovery fuel and their mixts. with preliminarily dried sewage sludge were gasified with an O-2-enriched air in a pilot-plant fixed-bed reactor (60 kW(t)) at 600-1100 degrees C to produce the CO, CO2, MeH and H-2-contg. process gas. The gas produced by gasification of the chips contained 20% CO, while the gasification of solid recovery fuel yielded the gas containing only 13% CO. In the case of the composite fuel, the CO content was even lower.