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Li Y, Wang S, Dong R, Li X. A large cathode surface area promotes electromethanogenesis at a proper external voltage in a single coaxial microbial electrolysis cell. Sci Total Environ 2023; 868:161721. [PMID: 36682571 DOI: 10.1016/j.scitotenv.2023.161721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 01/07/2023] [Accepted: 01/15/2023] [Indexed: 06/17/2023]
Abstract
Microbial electrolysis cell coupled with anaerobic digestion (MEC-AD) is currently encountering constraints on electromethanogenesis. The electrode configuration modification can be a simple yet efficient way to improve electromethanogenesis. This study evaluated two coaxial electrode configurations (large anode and small cathode: A10C1; small anode and large cathode: A1C10) using carbon felt as the electrode material. At an external voltage of 1.7 V, CH4 content was found exclusively higher in A1C10 (11 % and 13 % higher for acetate-fed and cow manure-fed, respectively) than that of the control reactors. Consequently, CH4 production was 13 % and 29 % higher in acetate-fed and CM-fed A1C10, respectively. The strengthened electromethanogenesis was attributed to the enrichment of interspecies hydrogen transfer microbes (i.e., Mesotoga and Bathyarchaeia). The coaxial configuration with a large cathode surface area demonstrated a viable stereotype in MEC-AD for improved waste treatment and energy recovery.
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Affiliation(s)
- Yu Li
- College of Engineering, China Agricultural University (Key laboratory for clean renewable energy utilization technology, Ministry of Agriculture), Beijing 100083, People's Republic of China
| | - Siqi Wang
- College of Engineering, China Agricultural University (Key laboratory for clean renewable energy utilization technology, Ministry of Agriculture), Beijing 100083, People's Republic of China
| | - Renjie Dong
- College of Engineering, China Agricultural University (Key laboratory for clean renewable energy utilization technology, Ministry of Agriculture), Beijing 100083, People's Republic of China
| | - Xin Li
- College of Engineering, China Agricultural University (Key laboratory for clean renewable energy utilization technology, Ministry of Agriculture), Beijing 100083, People's Republic of China.
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Ben Hania W, Fadhlaoui K, Brochier-Armanet C, Persillon C, Postec A, Hamdi M, Dolla A, Ollivier B, Fardeau ML, Le Mer J, Erauso G. Draft genome sequence of Mesotoga strain PhosAC3, a mesophilic member of the bacterial order Thermotogales, isolated from a digestor treating phosphogypsum in Tunisia. Stand Genomic Sci 2015; 10:12. [PMID: 26464750 PMCID: PMC4603820 DOI: 10.1186/1944-3277-10-12] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2014] [Accepted: 11/30/2014] [Indexed: 11/10/2022] Open
Abstract
Mesotoga strain PhosAc3 was the first mesophilic cultivated member of the order Thermotogales. This genus currently contain two described species, M. prima and M. infera. Strain PhosAc3, isolated from a Tunisian digestor treating phosphogypsum, is phylogenetically closely related to M. prima strain MesG1.Ag.4.2(T). Strain PhosAc3 has a genome of 3.1 Mb with a G+C content of 45.2%. It contains 3,051 protein-coding genes of which 74.6% have their best reciprocal BLAST hit in the genome of the type species, strain MesG1.Ag.4.2(T). For this reason we propose to assign strain PhosAc3 as a novel ecotype of the Mesotoga prima species. However, in contrast with the M. prima type strain, (i) it does not ferment sugars but uses them only in the presence of elemental sulfur as terminal electron acceptor, (ii) it produces only acetate and CO2 from sugars, whereas strain MesG1.Ag.4.2(T) produces acetate, butyrate, isobutyrate, isovalerate, 2-methyl-butyrate and (iii) sulfides are also end products of the elemental sulfur reduction in theses growth conditions.
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Affiliation(s)
- Wajdi Ben Hania
- Aix-Marseille Université, Université du Sud Toulon-Var, CNRS/INSU, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, F-13288 Marseille, cedex 09, France ; Laboratoire d'Ecologie et de Technologie Microbienne, Institut National des Sciences Appliquées et de Technologie, Faculté des Sciences de Carthage, Centre Urbain Nord, BP 676, Tunis, 1080 Tunisia
| | - Khaled Fadhlaoui
- Aix-Marseille Université, Université du Sud Toulon-Var, CNRS/INSU, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, F-13288 Marseille, cedex 09, France ; Laboratoire d'Ecologie et de Technologie Microbienne, Institut National des Sciences Appliquées et de Technologie, Faculté des Sciences de Carthage, Centre Urbain Nord, BP 676, Tunis, 1080 Tunisia
| | - Céline Brochier-Armanet
- CNRS, UMR 5558, Laboratoire de Biométrie et Biologie Evolutive, Université de Lyon, Université Lyon 1, 43 boulevard du 11 novembre 1918, Villeurbanne, F-69622 France
| | | | - Anne Postec
- Aix-Marseille Université, Université du Sud Toulon-Var, CNRS/INSU, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, F-13288 Marseille, cedex 09, France
| | - Moktar Hamdi
- Laboratoire d'Ecologie et de Technologie Microbienne, Institut National des Sciences Appliquées et de Technologie, Faculté des Sciences de Carthage, Centre Urbain Nord, BP 676, Tunis, 1080 Tunisia
| | - Alain Dolla
- Aix-Marseille Université, CNRS, LCB-UMR7283, Marseille, F-13009 France
| | - Bernard Ollivier
- Aix-Marseille Université, Université du Sud Toulon-Var, CNRS/INSU, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, F-13288 Marseille, cedex 09, France
| | - Marie-Laure Fardeau
- Aix-Marseille Université, Université du Sud Toulon-Var, CNRS/INSU, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, F-13288 Marseille, cedex 09, France
| | - Jean Le Mer
- Aix-Marseille Université, Université du Sud Toulon-Var, CNRS/INSU, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, F-13288 Marseille, cedex 09, France
| | - Gaël Erauso
- Aix-Marseille Université, Université du Sud Toulon-Var, CNRS/INSU, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, F-13288 Marseille, cedex 09, France
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