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Xu C, Cao W, Guo F, Hu C, Lyu L. Enhancing methane production in anaerobic digestion via improved electron transfer with dual-reaction-centers catalyst. ENVIRONMENTAL RESEARCH 2025; 272:121190. [PMID: 39983958 DOI: 10.1016/j.envres.2025.121190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2024] [Revised: 02/07/2025] [Accepted: 02/19/2025] [Indexed: 02/23/2025]
Abstract
The recovery of methane from waste-activated sludge and rice straw often encounters challenges due to inefficient electron transfer between microorganisms. To break through this bottleneck, a novel and effective strategy is urgently needed. Here, we propose adding dual reaction centers (DRCs) catalyst with electron-rich and electron-poor microregions into the anaerobic digestion (AD) system. Pigeon manure was transformed into a novel DRCs catalyst, Fe-PMC, through pyrolysis and doping. Our findings indicate that the micro-electric field on the surface of Fe-PMC effectively aggregated humic acid-like substances and increased sludge conductivity. Compared to the control group (0 mg/L), adding trace amounts of Fe-PMC (40 mg/L) significantly increased methane production by 27.45%. High-throughput sequencing analyses revealed that Fe-PMC enhanced the relative abundance of functional microorganisms, such as Geobacter (23.62%) and Methanobacterium (35.53%), thereby promoting methanogenic co-metabolism. Furthermore, functional genes associated with carbon dioxide reduction to methane and direct interspecific electron transfer were upregulated by 3.41%-297.66%. This study provides a valuable reference for recovering renewable energy from waste using DRCs catalysts.
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Affiliation(s)
- Congfeng Xu
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Institute of Environmental Research at Greater Bay, Guangzhou University, Guangzhou, 510006, China
| | - Wenrui Cao
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Institute of Environmental Research at Greater Bay, Guangzhou University, Guangzhou, 510006, China
| | - Fangxing Guo
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Institute of Environmental Research at Greater Bay, Guangzhou University, Guangzhou, 510006, China
| | - Chun Hu
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Institute of Environmental Research at Greater Bay, Guangzhou University, Guangzhou, 510006, China
| | - Lai Lyu
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Institute of Environmental Research at Greater Bay, Guangzhou University, Guangzhou, 510006, China; Institute of Rural Revitalization, Guangzhou University, Guangzhou, 510006, China.
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Geng F, Liu J, Liu J, Lu Z, Pan Y. Recent progress in understanding the role of bacterial extracellular DNA: focus on dental biofilm. Crit Rev Microbiol 2024:1-19. [PMID: 39648406 DOI: 10.1080/1040841x.2024.2438117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 05/11/2024] [Accepted: 11/30/2024] [Indexed: 12/10/2024]
Abstract
Dental biofilm is a highly complicated and dynamic structure comprising not only microbial communities but also the surrounding matrix of extracellular polymeric substances (EPS), including polysaccharides, proteins, extracellular DNA (eDNA) and other biopolymers. In recent years, the important role of bacterial eDNA in dental biofilms has gradually attracted attention. In this review, we present recent studies on the presence, dynamic conformation and release of oral bacterial eDNA. Moreover, updated information on functions associated with oral bacterial eDNA in biofilm formation, antibiotic resistance, activation of the immune system and immune evasion is highlighted. Finally, we summarize the role of oral bacterial eDNA as a promising target for the treatment of oral diseases. Increasing insight into the versatile roles of bacterial eDNA in dental biofilms will facilitate the prevention and treatment of biofilm-induced oral infections.
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Affiliation(s)
- Fengxue Geng
- Department of Periodontics, School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Junchao Liu
- Department of Periodontics, School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Jinwen Liu
- Department of Periodontics, School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Ze Lu
- Liaoning Provincial Key Laboratory of Oral Diseases, Department of Oral Biology, School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Yaping Pan
- Department of Periodontics, School and Hospital of Stomatology, China Medical University, Shenyang, China
- Liaoning Provincial Key Laboratory of Oral Diseases, Department of Oral Biology, School and Hospital of Stomatology, China Medical University, Shenyang, China
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Zhang M, Wang T, Han Y, Yan X, Zhu X, Sun Y, Jiang X, Wang X. Anode potential regulates gas composition and microbiome in anaerobic electrochemical digestion. BIORESOURCE TECHNOLOGY 2024; 412:131414. [PMID: 39226941 DOI: 10.1016/j.biortech.2024.131414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2024] [Revised: 08/16/2024] [Accepted: 08/31/2024] [Indexed: 09/05/2024]
Abstract
Anaerobic electrochemical digestion (AED) is an effective system for recovering biogas from organic wastes. However, the effects of different anode potentials on anaerobic activated sludge remain unclear. This study confirmed that biofilms exhibited the best electroactivity at -0.2 V (vs. Ag/AgCl) compared to -0.4 V and 0 V. Gas was further regulated, with the highest hydrogen content (47 ± 7 %) observed at -0.2 V. The 0 V system produced the largest amount of methane (70 ± 8 %) and exhibited the greatest presence of hydrogen-utilizing microorganisms. The gas yield at -0.4 V was the lowest, with no hydrogen detected. Excess bioelectrohydrogen at -0.2 V and 0 V caused the co-enrichment of Methanobacterium and Acetoanaerobium, establishing a thermodynamically feasible current-acetate-hydrogen electron cycle to improve electrogenesis. These results provide insights into the regulatory strategies of MEC technology during anaerobic digestion, which play a decisive role in determining the composition of biogas.
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Affiliation(s)
- Mou Zhang
- MOE Key Laboratory of Pollution Processes and Environmental Criteria / College of Environmental Science & Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China
| | - Tuo Wang
- MOE Key Laboratory of Pollution Processes and Environmental Criteria / College of Environmental Science & Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China
| | - Yilian Han
- MOE Key Laboratory of Pollution Processes and Environmental Criteria / College of Environmental Science & Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China
| | - Xuejun Yan
- MOE Key Laboratory of Pollution Processes and Environmental Criteria / College of Environmental Science & Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China
| | - Xuemei Zhu
- MOE Key Laboratory of Pollution Processes and Environmental Criteria / College of Environmental Science & Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China
| | - Yue Sun
- MOE Key Laboratory of Pollution Processes and Environmental Criteria / College of Environmental Science & Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China
| | - Xinlei Jiang
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China.
| | - Xin Wang
- MOE Key Laboratory of Pollution Processes and Environmental Criteria / College of Environmental Science & Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China.
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Long S, Liu X, Xiao J, Ren D, Liu Z, Fu Q, He D, Wang D. Mitigation of Triclocarban Inhibition in Microbial Electrolysis Cell-Assisted Anaerobic Digestion. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:9272-9282. [PMID: 38749055 DOI: 10.1021/acs.est.3c10604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Triclocarban (TCC), as a widely used antimicrobial agent, is accumulated in waste activated sludge at a high level and inhibits the subsequent anaerobic digestion of sludge. This study, for the first time, investigated the effectiveness of microbial electrolysis cell-assisted anaerobic digestion (MEC-AD) in mitigating the inhibition of TCC to methane production. Experimental results showed that 20 mg/L TCC inhibited sludge disintegration, hydrolysis, acidogenesis, and methanogenesis processes and finally reduced methane production from traditional sludge anaerobic digestion by 19.1%. Molecular docking revealed the potential inactivation of binding of TCC to key enzymes in these processes. However, MEC-AD with 0.6 and 0.8 V external voltages achieved much higher methane production and controlled the TCC inhibition to less than 5.8%. TCC in the MEC-AD systems was adsorbed by humic substances and degraded to dichlorocarbanilide, leading to a certain detoxification effect. Methanogenic activities were increased in MEC-AD systems, accompanied by complete VFA consumption. Moreover, the applied voltage promoted cell apoptosis and sludge disintegration to release biodegradable organics. Metagenomic analysis revealed that the applied voltage increased the resistance of electrode biofilms to TCC by enriching functional microorganisms (syntrophic VFA-oxidizing and electroactive bacteria and hydrogenotrophic methanogens), acidification and methanogenesis pathways, multidrug efflux pumps, and SOS response.
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Affiliation(s)
- Sha Long
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, P. R. China
| | - Xuran Liu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, P. R. China
| | - Jun Xiao
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, P. R. China
| | - Dejiang Ren
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, P. R. China
| | - Zewei Liu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, P. R. China
| | - Qizi Fu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, P. R. China
| | - Dandan He
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, P. R. China
| | - Dongbo Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, P. R. China
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Dzofou Ngoumelah D, Heggeset TMB, Haugen T, Sulheim S, Wentzel A, Harnisch F, Kretzschmar J. Effect of model methanogens on the electrochemical activity, stability, and microbial community structure of Geobacter spp. dominated biofilm anodes. NPJ Biofilms Microbiomes 2024; 10:17. [PMID: 38443373 PMCID: PMC10915144 DOI: 10.1038/s41522-024-00490-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 02/20/2024] [Indexed: 03/07/2024] Open
Abstract
Combining anaerobic digestion (AD) and microbial electrochemical technologies (MET) in AD-MET holds great potential. Methanogens have been identified as one cause of decreased electrochemical activity and deterioration of Geobacter spp. biofilm anodes. A better understanding of the different interactions between methanogenic genera/species and Geobacter spp. biofilms is needed to shed light on the observed reduction in electrochemical activity and stability of Geobacter spp. dominated biofilms as well as observed changes in microbial communities of AD-MET. Here, we have analyzed electrochemical parameters and changes in the microbial community of Geobacter spp. biofilm anodes when exposed to three representative methanogens with different metabolic pathways, i.e., Methanosarcina barkeri, Methanobacterium formicicum, and Methanothrix soehngenii. M. barkeri negatively affected the performance and stability of Geobacter spp. biofilm anodes only in the initial batches. In contrast, M. formicicum did not affect the stability of Geobacter spp. biofilm anodes but caused a decrease in maximum current density of ~37%. M. soehngenii induced a coloration change of Geobacter spp. biofilm anodes and a decrease in the total transferred charge by ~40%. Characterization of biofilm samples after each experiment by 16S rRNA metabarcoding, whole metagenome nanopore sequencing, and shotgun sequencing showed a higher relative abundance of Geobacter spp. after exposure to M. barkeri as opposed to M. formicicum or M. soehngenii, despite the massive biofilm dispersal observed during initial exposure to M. barkeri.
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Affiliation(s)
- Daniel Dzofou Ngoumelah
- DBFZ Deutsches Biomasseforschungszentrum gemeinnützige GmbH (German Biomass Research Centre), Department of Biochemical Conversion, 04347, Leipzig, Germany
| | | | - Tone Haugen
- SINTEF Industry, Department of Biotechnology and Nanomedicine, 7034, Trondheim, Norway
| | - Snorre Sulheim
- SINTEF Industry, Department of Biotechnology and Nanomedicine, 7034, Trondheim, Norway
| | - Alexander Wentzel
- SINTEF Industry, Department of Biotechnology and Nanomedicine, 7034, Trondheim, Norway
| | - Falk Harnisch
- Helmholtz Centre for Environmental Research - UFZ, Department of Microbial Biotechnology, 04318, Leipzig, Germany
| | - Jörg Kretzschmar
- DBFZ Deutsches Biomasseforschungszentrum gemeinnützige GmbH (German Biomass Research Centre), Department of Biochemical Conversion, 04347, Leipzig, Germany.
- Zittau/Görlitz University of Applied Sciences, Faculty of Natural and Environmental Sciences, 02763, Zittau, Germany.
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