文献类型：期刊文献

英文题名：Hydrodynamic design of down-flow packed bed reactor regulated the biohydrogen production and microbial enrichment

作者：Zhang, Zexi[1,2];Ding, Ke[3];Ma, Xiaojun[4];Tang, Shuai[1,2];Wang, Zixin[5];Lu, Haifeng[1,2];Jiang, Weizhong[1,2];Si, Buchun[1,2]

第一作者：Zhang, Zexi

通讯作者：Si, BC[1]

机构：[1]China Agr Univ, Coll Water Resources & Civil Engn, Key Lab Agr Engn Struct & Environm, Minist Agr & Rural Affairs, Beijing 100083, Peoples R China;[2]Sanya Inst China Agr Univ, Sanya 572020, Hainan, Peoples R China;[3]Univ Illinois, Dept Mech Sci & Engn, Champaign, IL 61801 USA;[4]Beijing Union Univ, Coll Biochem Engn, Beijing 100023, Peoples R China;[5]Univ Illinois, Dept Agr & Biol Engn, Urbana, IL 61801 USA

第一机构：China Agr Univ, Coll Water Resources & Civil Engn, Key Lab Agr Engn Struct & Environm, Minist Agr & Rural Affairs, Beijing 100083, Peoples R China

通讯机构：[1]corresponding author), China Agr Univ, Coll Water Resources & Civil Engn, Key Lab Agr Engn Struct & Environm, Minist Agr & Rural Affairs, Beijing 100083, Peoples R China.

年份：2023

卷号：271

外文期刊名：ENERGY

收录：;EI(收录号：20231013665913);Scopus(收录号：2-s2.0-85149256539);WOS:【SCI-EXPANDED(收录号:WOS:000965790400001)】；

基金：The authors gratefully acknowledge support from National Key R & D program of China (2022YFE0135600) , Project of Sanya Yazhou Bay Science and Technology City (SCKJ-JYRC-2022-34) , Key R & D Program of Hainan (ZDYF2021XDNY138) and Undergraduate Research Program of China Agricultural University.

语种：英文

外文关键词：Packed bed reactor; Hydrogen production; Hydrodynamic design; Microbial structure; Dark fermentation; Computational fluid dynamics simulation

摘要：The hydrodynamic regulation, by adjusting microbial carrier filling strategies, plays a critical role in packed bed reactors (PBRs) for biohydrogen production, but the relationship between hydrodynamic characteristics, mi-crobial enrichment and hydrogen production has not been fully understood. In this study, hydrodynamic characteristics of different filling strategies in PBRs were designed and analyzed using computational fluid dy-namics (CFD) simulation. Further, the hydrogen production and microbial structure during the continuous operation of PBRs with different filling approaches were compared. The optimal hydrodynamic design was PBR with vertical filling strategy (PBR-V) which had a more evenly distributed velocity magnitude than that with horizontal (PBR-H) arrangement, and it benefited mass transfer and further improved the reactor performance. PBR-V achieved the maximum hydrogen yield of 2.6 mol/mol glucose since the hydrodynamic design favored hydrogen production (butyrate-type fermentation) and suppressed hydrogen-consuming reactions (propionate -type fermentation). In addition, the PBR-V had a quicker start-up and favored the biomass attachment to the filling carriers. A higher abundance of hydrogen producer Clostridiaceae (89.2%) in PBR-V during start-up than that in PBR-H was also confirmed. This study provides insight into hydrodynamic and microbial selection mechanisms, and guides the design of future anaerobic high-rate reactors for efficient biohydrogen production.