Study on the comprehensive utilization of city kitchen waste as a resource in China

Kitchen waste (KW) is one of the most important solid wastes in cities. The amount of KW generated in China's cities is very large per capita, and processing technology is simple. Based on a data analysis, field investigation and experimental research, KW is acidic, has high moisture content, has high organic matter content, and has a big difference in C/N ratio. It is found that comprehensive utilization of KW has great advantages by means of SWOT analysis. Complete KW resource utilization can be achieved through a comprehensive treatment technology consisting of pretreatment, wet solution, oil-water separation and anaerobic digestion. Grease is converted to ester through acid catalytic pre-esterification and alkaline catalytic transesterification reaction, followed by vacuum distillation to generate biodiesel. Biological desulfurization was effective in purifying the biogas. The comprehensive treatment products include biodiesel and biogas. This study has important guiding significance for the treatment of KW. (C) 2019 Elsevier Ltd. All rights reserved.