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

文献类型：期刊论文

作者Wu, Di1,3; Li, Lei1; Zhen, Feng3; Liu, Huiliang3; Xiao, Fan3; Sun, Yongming3; Peng, Xuya1; Li, Ying3,4; Wang, Xiaoming1,2
刊名WATER RESEARCH
出版日期2022-05-01
卷号214页码:11
ISSN号0043-1354
关键词Anaerobic digestion Organic overload Process stability Substrate-to-inoculum ratio Thermodynamic analysis Volatile fatty acids
DOI10.1016/j.watres.2022.118187
通讯作者Peng, Xuya() ; Li, Ying()
英文摘要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.
WOS关键词EXTERNAL ELECTRON-ACCEPTOR ; METHANE PRODUCTION ; COMMUNITY ; SULFATE ; ENERGY ; WASTE
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
语种英语
出版者PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号WOS:000758826100008
资助机构National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Fundamental Research Funds for the Central Universities
源URL[http://ir.giec.ac.cn/handle/344007/35918]  
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.Chongqing Univ, Key Lab Gorges Reservoir Reg Ecoenvironm 3, Minist Educ, Chongqing 400045, Peoples R China
2.174 Shapingba Zhengjie St, Chongqing 400045, Peoples R China
3.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China
4.2 Nengyuan Rd, Wushan, Peoples R China
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.

入库方式： OAI收割

来源：广州能源研究所

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