NOVELTY - Biological waste material is mixed with water. Waste material and water are subjected to ultrasonic irradiation. Irradiated material is fed to an anaerobic digester (16) and biogas having methane is generated. Biogas is fed to a catalyst reformer unit (20) to form a synthesis gas. The steam-methane ratio contained in gas mixture is adjusted, and synthesis gas containing hydrogen and carbon monoxide of high concentration is obtained.    USE - For treating biological waste material, such as plant or animal waste product, used for generation of electricity and liquid hydrocarbon (claimed).    ADVANTAGE - The biological waste material is effectively treated, and electricity and liquid hydrocarbon are efficiently produced.    DETAILED DESCRIPTION - Biological waste material is mixed with water, unless waste material contains specific amount of amount of water. The waste material and water are subjected to ultrasonic irradiation. The irradiated material is then fed to an anaerobic digester, and biogas containing methane is generated. The biogas is fed to a catalyst reformer unit to form a synthesis gas. The steam-methane ratio contained in gas mixture of reformer unit is adjusted, and synthesis gas containing hydrogen of high concentration and carbon monoxide of high concentration is obtained. An INDEPENDENT CLAIM is included for biological waste material treatment plant (10), which has unit for mixing waste material and water, ultrasonic irradiator (12), anaerobic digester, catalytic reformer unit and unit for adjusting ratio of steam with respect to methane. The ultrasonic irradiator irradiates waste material and water. The anaerobic digester digests irradiated waste material to produce biogas. The reformer unit produces synthesis gas using biogas.    DESCRIPTION OF DRAWING(S) - The figure shows a biological waste material treatment plant.    biological waste material treatment plant (10)    ultrasonic irradiator (12)    anaerobic digester (16)    biogas stream (18)    catalytic reformer unit (20)    synthesis gas stream (24)    fuel cell (26)    Fisher-Tropsch synthesis reactor (32)