关键词: 垃圾分类, 厨余垃圾, 干式厌氧, 卧式推流单轴搅拌器, 挥发性固体

Abstract: Dry anaerobic fermentation technology is one of the effective methods for treating kitchen waste, which can achieve waste reduction, resource utilization, and harmlessness, with low energy consumption and environmental impact. In the Chongqing Luoqi kitchen waste treatment project, the complete set of horizontal push flow single axis stirring dry anaerobic fermentation technology has been successfully applied through equipment introduction and technology development, achieving important technological progress. In the continuous operation in 2024, each unit operated stably and efficiently, with stable control of process parameters, and obtained a large amount of technical data. The daily average unit production of garbage biogas was 119.06 m3/t, with a volumetric gas production rate of 5.44 m3/m3, and the biogas components were stable at 55% to 65%. The production and solid content of dehydrated residue were effectively controlled, and the ratio of dehydrated residue to feed quantity was always controlled below 40%. The amount of biogas slurry was small, and the solid content of biogas slurry was stable below 1%. The key technical control indicators of dry anaerobic fermentation technology were obtained through data analysis, with an average feed volatile solid load（measured by VS) of 10.50 kg/（m3·d）.The average decomposition rate of volatile solids was 77.39%, and the average methane production（measured by VS) from volatile solids decomposed per unit was 472.58 L/kg. At present, the theoretical research on anaerobic treatment technology for high solid content waste materials in China is not yet complete, and most of the application projects cannot meet the production standards. Therefore, this study can provide theoretical and data basis for the research of dry anaerobic fermentation process in China, and also provide technical support for the promotion of dry anaerobic fermentation technology application in the field of kitchen waste in China.

Key words: waste classification, kitchen waste, dry anaerobic, horizontal thrust flow single axis agitator, volatile solid