Sludge source-redox mediators obtainment and availability for enhancing bioelectrogenesis and acidogenesis: Deciphering characteristics and mechanisms

第一作者：	Xin, Xiaodong
英文第一作者：	Xin, Xiaodong
联系作者：	Xin, Xiaodong
英文联系作者：	Xin, Xiaodong
发表年度：	2023
卷：	236
摘要：	Anaerobic biological treatment was regarded as one of promising options for realizing concurrent WAS reduc-tion, stabilization and bioenergy/bioresource recycle. But the relatively low treatment efficiency limited its spreading application toward larger scale considerably in China. Aimed at such barrier, this study offered a novel enhancing strategy for achieving high-efficiency of bioenergy/bioresource recycle from WAS anaerobic treat-ment via improving bioelectrogenesis/acidogenesis using sludge source-redox mediators (SSRMs). SSRMs not only facilitated bioeletrogenesis with an increasing efficiency of 36% for voltage output and 39% for bioelectricity bioconversion, but also enhanced acidogenesis of WAS with a mean elevating efficiency of 37.5% of volatile fatty acids (VFAs) production within 5 d Mechanistic investigations indicated that SSRMs had a po-tential influence on improving the protein and carbohydrate metabolisms-related genes' expression for enhancing bioelectrogenesis and acidogenesis. Moreover, SSRMs exerted roles of electrochemical "catalysts" or as terminal electron acceptors with affecting functional proteins of complexes of I and IV in electron transfer chains for improving electron transfer efficiency. Meanwhile, the core members' abundance, microbial diversity and community distributive evenness were prompted concurrently for carrying out superior bioelectrogenesis and acidogenesis. A schematic illustration was established for demonstrating the mechanism of SSRMs for enhancing bioelectrogenesis and acidogenesis via changing microbial metabolism functions, enhancing electron transfer efficiency, and regulating functional genes' expression of functional proteins (up-regulating cytochrome c oxidase and down-regulating-NADH dehydrogenase). This study provided an effective enhancing strategy for facilitating WAS bioconversion to bioenergy/bioresource with well-process sustainability.
刊物名称：	WATER RESEARCH
参与作者：	Xin,XD(Xin,Xiaodong)[1],[2],[9];Xie,JQ(Xie,Jiaqian)[2];Wang,YF(Wang,Yanfang)[3];Li,L(Li,Lin)[4];Li,W(Li,Wei)[1];Lv,SH(Lv,Sihao)[1];Wen,ZD(Wen,Zhidan)[5];He,JG(He,Junguo)[6];Xin,Y(Xin,Ying)[7],[8]