餐厨垃圾干式厌氧消化过程流变特性变化及其对反应器流场的影响  

Alteration of rheological properties of food waste during dry anaerobic digestion and influence on reactor fluid field

作　　者：秦文磊 刘吉宝[1,3] 祝金星 宋云鹏 陈梅雪[1,3] 于川洋 魏源送[1,2,3] QIN Wenlei;LIU Jibao;ZHU Jinxing;SONG Yunpeng;CHEN Meixue;YU Chuanyang;WEI Yuansong(State Key Joint Laboratory of Environmental Simulation and Pollution Control,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;University of Chinese Academy of Sciences,Beijing 100049,China;Department of Water Pollution Control Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;Beijing Environmental Engineering Technology Co.,Ltd.,Beijing 101318,China;Dalian Ecological and Environmental Affairs Service Center,Dalian 116014,China)

机构地区：[1]中国科学院生态环境研究中心环境模拟与污染控制国家重点联合实验室,北京100085 [2]中国科学院大学,北京100049 [3]中国科学院生态环境研究中心水污染控制实验室,北京100085 [4]北京环境工程技术有限公司,北京101318 [5]大连市生态环境事务服务中心,大连116014

出　　处：《环境工程学报》2022年第2期584-593,共10页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划项目(2018YFD1100603)。

摘　　要：餐厨垃圾的有机组成是影响其干式厌氧消化性能的重要因素。以实际餐厨垃圾为研究对象,通过向其中投加馒头改变其有机组成,进而研究不同有机组成下物料厌氧消化过程中的流变特性变化及产甲烷特性。结果表明,不同有机组成物料的甲烷产气量与其粘度具有一定的负相关关系,表明物料流动性的提高有助于其产甲烷效率的提高。而物料流变特性的差异则主要可归因于TS、VS以及溶解性有机物释放的差异。物料的屈服应力与其TS、VS具有一定的线性相关关系。CFD模拟结果表明,随着厌氧消化的进行,反应器内流场逐渐变好,死区率降低,且死区率与物料TS质量分数、屈服应力及表观粘度呈正相关关系。因此,针对不同有机组成物料流变特性及反应器流场的不同需选取合适的搅拌策略,以实现搅拌效率与搅拌能耗之间的平衡。本研究结果可为优化干式厌氧消化反应器的运行提供参考。The organic composition of food waste is a significant factor affecting its dry anaerobic digestion performance.This study selected real food waste as the research object,and changed its organic composition by adding steamed bread to investigate its rheological properties and methane production characteristics under different organic compositions during dry anaerobic digestion.The results indicated that the methane yields of different substrates had certain negative correlation with its viscosity,suggesting that the improvement of fluidity was beneficial to the increase of methane production efficiency.The difference in the rheological properties of food waste could mainly be attributed to the different contents of TS,VS and the release of dissolved organic matters.The yield stress of different substrates had a certain linear correlation with its TS and VS contents.The CFD simulation results demonstrated that the fluid field in the reactor became better and the dead zone proportion decreased with the progress of anaerobic digestion.Moreover,the dead zone proportion was positively correlated with the TS content,yield stress and apparent viscosity of substrates.Therefore,based on the rheological characteristics of substrates with different organic compositions and the corresponding fluid field in the reactor,it was necessary to select a suitable stirring strategy to achieve a balance between stirring efficiency and energy consumption.The results of this study can provide a reference for the optimization of the operation of dry anaerobic digestion reactor.

关 键 词：餐厨垃圾 干式厌氧消化 有机组成 流变特性 流场模拟 

分 类 号：X705[环境科学与工程—环境工程]