Technical progress and perspective on the thermochemical conversion of kitchen waste and relevant applications: A comprehensive review

•Thermal conversion is an effective method to convert kitchen waste into energy products.•The quality of pyrolysis products is improved by co-pyrolysis and catalytic pyrolysis.•Plasma gasification can enable the real harmless treatment, and supercritical water gasification can product syngas with high quality.•Detailed description of hydrothermal carbonization mechanism and torrefaction kinetics are provided.