摘要
针对微生物电解池(MEC)处理剩余污泥丁酸型发酵液有机质降解率低的问题,探讨了丁酸驯化对丁酸型发酵液降解及微生物群落的影响,分析了电化学特性、产气性能、有机物去除和微生物群落结构响应.结果表明,丁酸钠驯化有效提高了系统的稳定输出电流密度,提升了产气速率.驯化后处理丁酸型发酵液时,该系统表现出更高的电流密度峰值(19A/m^(3))、更显著的氧化峰(峰值电流78.1mA)和更高的有机物降解率(SCOD去除率58.67%,VFAs去除率41.76%),能量回收率达118.8%.机制分析表明,丁酸钠驯化有效富集了丁酸氧化菌(Syntrophomonas),形成了比乙酸钠驯化系统更高效的代谢路径,从而强化了丁酸型发酵液的降解.
In order to improve the degradation efficiency of microbial electrolysis cells(MECs)treating butyric acid fermentation broth from excess sludge,this study investigated the influence of butyrate acclimation on degradation and microbial communities,with a focus on the changes of electrochemical characteristics,gas production,organics removal,and microbial community structure.Results showed that sodium butyrate acclimation enhanced current density and gas production rate during stable operation period.Moreover,when treating butyric acid fermentation broth,the acclimated system achieved higher peak current density(19A/m^(3)),higher oxidation peak(78.1mA),and higher organics degradation rate(SCOD removal of 58.67%;VFAs removal of 41.76%),with energy recovery attaining 118.8%.Mechanism analysis revealed that sodium butyrate acclimation effectively enriched butyrate-oxidizing bacteria(Syntrophomonas),establishing more efficient metabolic pathway in comparison with sodium acetate acclimation,thereby ameliorating the degradation of butyric acid fermentation broth.
作者
柏艺博
孙杏
胡凯
陈卫
许航
BAI Yi-bo;SUN Xing;HU Kai;CHEN Wei;XU Hang(Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education,Hohai University,Nanjing 210098,China;College of Environment,Hohai University,Nanjing 210098,China;Suzhou Water Supply and Drainage Management Office,Suzhou 215000,China)
出处
《中国环境科学》
北大核心
2026年第2期749-757,共9页
China Environmental Science
基金
国家重点研发计划(2023YFC3208900)。
关键词
剩余污泥
丁酸型发酵液
微生物电解池
驯化底物
微生物群落
excess sludge
butyric acid fermentation broth
microbial electrolysis cell
acclimation substrates
microbial community
