Thermodynamics of volatile fatty acid degradation during anaerobic digestion under organic overload stress: The potential to better identify process stability

doi:10.1016/j.watres.2022.118187

GIEC OpenIR

	Thermodynamics of volatile fatty acid degradation during anaerobic digestion under organic overload stress: The potential to better identify process stability
	Wu, Di 1,2; Li, Lei 2; Zhen, Feng1 ; Liu, Huiliang 1; Xiao, Fan 1; Sun, Yongming1 ; Peng, Xuya 2; Li, Ying1,3 ; Wang, Xiaoming 2,4
	2022-05-01
发表期刊	WATER RESEARCH
ISSN	0043-1354
卷号	214 页码:11
通讯作者	Peng, Xuya() ; Li, Ying()
摘要	Anaerobic digestion (AD) operating under organic overload stress usually increases the potential for process instability, leading to significant economic and ecological consequences. Volatile fatty acids (VFAs) accumulation is regularly considered a major factor during AD and their degradation is subject to thermodynamic constraints. To date, no study has systematically investigated the mechanisms of VFA degradation on process stability from the perspective of thermodynamics. Hence, increased substrate-to-inoculum ratio was applied in this study to simulate organic overload stress using batch tests with Hybrid Pennisetum. As a result, VFAs accumulation increased, accompanied by decreased methane yield, slower methane production kinetics and even severe process instability. Metagenomic analysis demonstrated that the accumulated propionate and butyrate were degraded by methyl-malonyl-CoA and the beta-oxidation pathway while syntrophic acetate oxidation was preferred during acetate degradation. The deviation of stability parameters to varying degrees from the recommended threshold values was observed. However, a subsequent thermodynamic analysis revealed that moderate organic overload stress merely retarded the syntrophic oxidation of propionate, butyrate, and acetate. As a result, the methanogenic activity decreased, and the lag phase of AD was extended, but no adverse thermodynamic effects actually occurred. Changes in the Gibbs free energy for syntrophic propionate and acetate oxidation have the potential to better identify process stability. This study provided novel insights into the underlying thermodynamic mechanisms of VFA degradation and may have important implications for improving the current diagnostic mode for AD process stability.
关键词	Anaerobic digestion Organic overload Process stability Substrate-to-inoculum ratio Thermodynamic analysis Volatile fatty acids
DOI	10.1016/j.watres.2022.118187
关键词[WOS]	EXTERNAL ELECTRON-ACCEPTOR ; METHANE PRODUCTION ; COMMUNITY ; SULFATE ; ENERGY ; WASTE
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51776208] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA21050400] ; Strategic Priority Research Program of the Chinese Academy of Sciences[2020CDCGHJ012] ; Fundamental Research Funds for the Central Universities
WOS研究方向	Engineering ; Environmental Sciences & Ecology ; Water Resources
项目资助者	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Fundamental Research Funds for the Central Universities
WOS类目	Engineering, Environmental ; Environmental Sciences ; Water Resources
WOS记录号	WOS:000758826100008
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：41[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/35919
专题	中国科学院广州能源研究所
通讯作者	Peng, Xuya; Li, Ying
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China 2.Chongqing Univ, Key Lab Gorges Reservoir Reg Ecoenvironm 3, Minist Educ, Chongqing 400045, Peoples R China 3.2 Nengyuan Rd, Wushan, Peoples R China 4.174 Shapingba Zhengjie St, Chongqing 400045, Peoples R China
第一作者单位	中国科学院广州能源研究所
推荐引用方式 GB/T 7714	Wu, Di,Li, Lei,Zhen, Feng,et al. Thermodynamics of volatile fatty acid degradation during anaerobic digestion under organic overload stress: The potential to better identify process stability[J]. WATER RESEARCH,2022,214:11.
APA	Wu, Di.,Li, Lei.,Zhen, Feng.,Liu, Huiliang.,Xiao, Fan.,...&Wang, Xiaoming.(2022).Thermodynamics of volatile fatty acid degradation during anaerobic digestion under organic overload stress: The potential to better identify process stability.WATER RESEARCH,214,11.
MLA	Wu, Di,et al."Thermodynamics of volatile fatty acid degradation during anaerobic digestion under organic overload stress: The potential to better identify process stability".WATER RESEARCH 214(2022):11.