Waste pyrolysis process
Thermal treatment of waste - Thermochemical processes

As the air factor${\lambda }_A$decreases (0 < ${\lambda }_A$ < 1), down to O₂ contents < 1%, the waste's external atmosphere, lacking oxygen, becomes reductive. An imposed heating process (convection or radiation) then causes the waste to dry out, followed by the "distillation" of its volatile matter, until the material is transformed into fixed carbon, the absence of oxygen no longer allowing combustion of the products of the decomposition reaction. This is known as waste pyrolysis.

This waste decomposition process is endothermic....