产酸作用
丁酸
化学
发酵
电渗析
梭状芽孢杆菌
醋酸
生物反应器
制浆造纸工业
废物管理
有机化学
细菌
生物化学
甲烷
膜
厌氧消化
生物
工程类
遗传学
作者
Wenyan Zhao,Binghua Yan,Zhiyong Jason Ren,Shanquan Wang,Yang Zhang,Heqing Jiang
出处
期刊:Water Research
[Elsevier]
日期:2022-11-01
卷期号:226: 119228-119228
被引量:15
标识
DOI:10.1016/j.watres.2022.119228
摘要
Selective production of carboxylic acids (CAs) from mixed culture fermentation remains a difficult task in organic waste valorization. Herein, we developed a facile and sustainable carbon loop strategy to regulate the fermentation micro-environment and steer acidogenesis towards selective butyric acid production. This new ion substitution electrodialysis-anaerobic membrane bioreactor (ISED-AnMBR) integrated system demonstrated a high butyric acid production at 11.19 g/L with a mass fraction of 76.05%. In comparison, only 1.04 g/L with a mass fraction of 30.56% was observed in the uncoupled control reactor. The carbon recovery reached a maximum of 96.09% with the assistance of ISED. Inorganic carbon assimilation was believed to be an important contributor, which was verified by 13C isotopic tracing. Microbial community structure shows the dominance of Clostridia (80.16%) in the unique micro-environment (e.g., pH 4.80-5.50) controlled by ISED, which is believed beneficial to the growth of such fermentative bacteria with main products of butyric acid and acetic acid. In addition, the emergence of chain elongators such as Clostridium sensu stricto 12 was observed to have a great influence on butyric acid production. This work provides a new approach to generate tailored longer chain carboxylic acids from organic waste with high titer thus contributing to a circular economy.
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