Abstract: A waste material treatment apparatus is provided which: supplies a reactant to facilitate a prompt reaction between an oxidation agent or a neutralizing agent and gases that contain chlorine, hydrocarbons, and the like, and that are emitted from non-plastic garbage present in waste materials when heated instantaneously; renders the non-plastic garbage harmless and reduced in volume without generating dioxins or carbon dioxide by repeating the instantaneous heating; and renders plastics harmless and cleaned, thereby enabling recycling thereof.