200t/d餐厨垃圾厌氧产沼工程调试与运行分析

Analysis of 200 t/d food waste anaerobic biogas production project

文章介绍了杭州市餐厨垃圾一期处理工程各工艺单元,分析了项目运行稳定性及存在问题,以期为后续其他餐厨垃圾处理工程提供经验借鉴。项目设计处理餐厨垃圾200 t/d,以"自动分选+三相提油+高效厌氧"为主要工艺路线。预处理自动分选系统可将餐厨垃圾中的塑料、金属和织物等杂质去除,三相提油系统将沥水及有机浆料中的油脂提取纯化制成毛油,经提油后有机浆料进入高效厌氧消化系统转化产生沼气和沼渣沼液。沼气用于发电上网,厌氧出水经固液分离产生的沼渣作填埋处置,沼液则进入填埋场渗滤液处理达到《生活垃圾填埋场污染控制标准》(GB 16889-2008)排放要求,从而实现餐厨垃圾的无害化和资源化处理及利用。该项目处理餐厨垃圾200 t/d,产生沼气13 000 m^3/d,发电26 000 kW·h/d,提油系统毛油产量为5.3 t/d,油脂回收率达88%。

This paper introduces the process units of the first phase of the Hangzhou municipal food waste disposal project, and analyzes the operation stability of the project and the existing problems, so as to provide references for other food waste treatment projects. The designed food waste treatment capacity of the project is 200 t/d, and the main process route is ＂automatic sorting＋ three phase oil extraction ＋ high efficiency anaerobic fermentation＂. The automatic sorting system can remove plastic, metal, fabric and other impurities in food waste. The three-phase oil extraction system can extract crude oil from food waste leachate and organic slurry. After oil extraction, organic slurry is pumped into the high efficiency anaerobic fermentation system to produce biogas. Biogas is consumed for electricity generation, while all electricity is transferred to the state grid. Anaerobic effluent is separated by the solid-liquid separation system. The solid part is sent to the landfill, while the liquid part is treated as leachate under the landfill pollution control standards-＂Pollution control standard of municipal solid waste landfill（GB 16889-2008）＂, so as to realize harmless and resource processing utilization of food waste. Under the food waste treatment capacity of 200 t/d, the project can produce 13 000 m^3/d biogas, 26 000 kW·h/d electricity, 5.3 t/d crude oil（oil recovery rate 88%）.