NOVELTY - The waste disposal system has thermal decomposition unit (2), modifier (4), scrubber (6), gas utilization unit (9), analyzer (11) and controller (12a). Unit (2) decomposes waste material (1) and generates thermal decomposition gas (3), and modifier converts gas (3) into reformed gas (5). The analyzer measures components in fuel/waste gas. The controller controls specific parameters based on measured component value.    USE - For disposing and volume reducing waste materials such as domestic waste, and using obtained fuel gas in gas engines, gas turbines and fuel cells for generating electric power.    ADVANTAGE - The waste disposal system appropriately controls the generation amount of trace components in fuel gas leading to flammable components, air pollution, and piping occlusion and corrosion.    DETAILED DESCRIPTION - The waste disposal system has a thermal decomposition unit (2), a modifier (4), a scrubber (6), a gas utilization installation (9), an analyzer (11), and a controller (12a). The thermal decomposition unit thermally decomposes the waste material (1) and generates a thermal decomposition gas (3). The modifier blows-in an oxidizing agent, carries out partial combustion of a thermal decomposition gas and converts the gas into a reformed gas (5) in a high temperature reducing environment. The scrubber washes the reformed gas with wash water (7) to produce a fuel gas (8). The fuel gas is used as fuel in the gas utilization installation which produces waste gas (10). The analyzer measures the components in the fuel gas or waste gas. The controller controls the temperature distribution during heating and amount of heat in the thermal decomposition unit, residence time, waste material feed rate and/or additive feed rate based on the component value measured by the analyzer.    DESCRIPTION OF DRAWING(S) - The figure shows the waste disposal system.    Waste material (1)    Thermal decomposition unit (2)    Thermal decomposition gas (3)    Modifier (4)    Reformed gas (5)    Scrubber (6)    Wash water (7)    Fuel gas (8)    Gas utilization installation (9)    Waste gas (10)    Analyzer (11)    Controller (12a)