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Bioresour Technol

Title:		Role of pretreatment type and microbial mechanisms on enhancing volatile fatty acids production during anaerobic fermentation of refinery waste activated sludge
Author(s):		Wang Q; Xin W; Shao Z; Usman M; Li J; Shang P; Kou Y; Gamal El-Din M; Chen C;
Address:		"State Key Laboratory of Petroleum Pollution Control, Beijing Key Laboratory of Oil and Gas Pollution Control, China University of Petroleum-Beijing, Beijing 102249, China. State Key Laboratory of Petroleum Pollution Control, CNPC Research Institute of Safety and Environmental Technology, Beijing 102200, China. Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada. State Key Laboratory of Petroleum Pollution Control, Beijing Key Laboratory of Oil and Gas Pollution Control, China University of Petroleum-Beijing, Beijing 102249, China. Electronic address: c.chen@cup.edu.cn"
Journal Title:		Bioresour Technol
Year:		2023
Volume:		20230502
Issue:
Page Number:		129122 -
DOI:		10.1016/j.biortech.2023.129122
ISSN/ISBN:		1873-2976 (Electronic) 0960-8524 (Linking)
Abstract:		"This study compared the effects of alkaline, thermal, thermal-peroxymonosulfate (PMS), and alkyl polyglucose (APG) pretreatments on volatile fatty acids (VFAs) production from refinery waste activated sludge (RWAS), including VFAs yield, composition, organics components, microbial communities, and the potential improvement of mechanisms. All pretreatments effectively enhanced the bioconversion of RWAS and consequently promoted the hydrolysis process, which inhibited the methanogenesis process. However, the release of lignin/carboxyl-rich alicyclic molecules (CRAM)-like compounds and tannin substances in Thermal-PMS and APG groups significantly influenced the acidogenesis and acetogenesis processes. Among all pretreatments, alkaline pretreatment showed the highest VFAs yield of 95.06 mg/g volatile solids (VS) and VS removal of 17%. This result could be associated with the enrichment of functional hydrolytic-acidification bacteria, such as Planococcus and Soehngenia, and increased metabolism of amino acids, carbohydrates, and nucleotides. By considering an economical and efficient perspective, this study recommended the alkaline pretreatment for the anaerobic fermentation of RWAS"
Keywords:		"Fermentation *Sewage/microbiology Anaerobiosis *Fatty Acids, Volatile Carbohydrate Metabolism Glucans/metabolism Hydrogen-Ion Concentration Alkaline fermentation Metabolic pathway Microbial community Refinery waste activated sludge composition Volatile fa;"
Notes:		"MedlineWang, Qinghong Xin, Wenzhuo Shao, Zhiguo Usman, Muhammad Li, Jin Shang, Pengyin Kou, Yue Gamal El-Din, Mohamed Chen, Chunmao eng England 2023/05/05 Bioresour Technol. 2023 Aug; 381:129122. doi: 10.1016/j.biortech.2023.129122. Epub 2023 May 2"