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, h...

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Bibliographic Details
Published in:Energy (Oxford) 2019-04, Vol.173, p.263-277
Main Authors: Wang, Hanxi, Xu, Jianling, Sheng, Lianxi
Format: Article
Language:English
Subjects:
Anaerobic digestion
Biodiesel
Biodiesel fuels
Biofuels
Biogas
Biological effects
Carbon/nitrogen ratio
Catalytic converters
Data analysis
Decision analysis
Diesel
Distillation
Esterification
Experimental research
Field investigations
Grease
Kitchen waste
Moisture content
Organic matter
Pretreatment
Pretreatment of water
Resource utilization
Solid wastes
Technology
Transesterification
Vacuum
Vacuum distillation
Water content
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Summary: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. •Anaerobic digestion is suitable for kitchen waste with high organic matter content.•Comprehensive treatment technology achieves full resource utilization of kitchen waste.•Grease extraction is completed using a two-stage oil-water separation system.•Vacuum distillation was used to produce biodiesel after the grease is converted to ester.•Biogas is purified via biological and dry desulfurization.
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2019.02.081