Abstract: The refuse processing machine of the invention reduces the bulk of the waste by heating and drying the waste in the waste container by heating means. The grinding and stirring means is operated while heating and drying, and the waste is ground and stirred. The waste is ground into small pieces by the grinding and stirring means, and heat of the heating means is hence smoothly transmitted to the inside of the waste, so that the moisture in the waste may be removed efficiently.

Abstract: A catalyst 1 is provided in a gas passage 4 for communicating between a gas flow-in unit 12 and a gas flow-out unit 13, and the catalyst 1 is heated by a heater 2, and a temperature sensor 3 for detecting the temperature of the heater 2 is provided inside the heater 2. By feeding power to the heater 2, the wall temperature of the heater 2 is raised to heat the catalyst 1, and then malodorous gas containing odor substances is passed in from the gas flow-in unit 12. The malodorous gas passes through the catalyst 1 in the gas passage 4 to be oxidized to be harmless and odorless, and is discharged from the gas flow-out unit 13.