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Beretta G, Sangalli M, Sezenna E, Tofalos AE, Franzetti A, Saponaro S. Microbial electrochemical Cr(VI) reduction in a soil continuous flow system. INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT 2024. [PMID: 38953765 DOI: 10.1002/ieam.4972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 05/21/2024] [Accepted: 05/28/2024] [Indexed: 07/04/2024]
Abstract
Microbial electrochemical technologies represent innovative approaches to contaminated soil and groundwater remediation and provide a flexible framework for removing organic and inorganic contaminants by integrating electrochemical and biological techniques. To simulate in situ microbial electrochemical treatment of groundwater plumes, this study investigates Cr(VI) reduction within a bioelectrochemical continuous flow (BECF) system equipped with soil-buried electrodes, comparing it to abiotic and open-circuit controls. Continuous-flow systems were tested with two chromium-contaminated solutions (20-50 mg Cr(VI)/L). Additional nutrients, buffers, or organic substrates were introduced during the tests in the systems. With an initial Cr(VI) concentration of 20 mg/L, 1.00 mg Cr(VI)/(L day) bioelectrochemical removal rate in the BECF system was observed, corresponding to 99.5% removal within nine days. At the end of the test with 50 mg Cr(VI)/L (156 days), the residual Cr(VI) dissolved concentration was two orders of magnitude lower than that in the open circuit control, achieving 99.9% bioelectrochemical removal in the BECF. Bacteria belonging to the orders Solirubrobacteriales, Gaiellales, Bacillales, Gemmatimonadales, and Propionibacteriales characterized the bacterial communities identified in soil samples; differently, Burkholderiales, Mycobacteriales, Cytophagales, Rhizobiales, and Caulobacterales characterized the planktonic bacterial communities. The complexity of the microbial community structure suggests the involvement of different microorganisms and strategies in the bioelectrochemical removal of chromium. In the absence of organic carbon, microbial electrochemical removal of hexavalent chromium was found to be the most efficient way to remove Cr(VI), and it may represent an innovative and sustainable approach for soil and groundwater remediation. Integr Environ Assess Manag 2024;00:1-17. © 2024 The Author(s). Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC).
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Affiliation(s)
- Gabriele Beretta
- Department of Civil and Environmental Engineering, Politecnico di Milano, Milano, Italy
| | - Michela Sangalli
- Department of Civil and Environmental Engineering, Politecnico di Milano, Milano, Italy
| | - Elena Sezenna
- Department of Civil and Environmental Engineering, Politecnico di Milano, Milano, Italy
| | - Anna Espinoza Tofalos
- Department of Earth and Environmental Sciences, University of Milano-Bicocca, Milano, Italy
- Environmental Research and Innovation (ERIN) Department, Institute of Science and Technology (LIST), Luxembourg, Luxembourg
| | - Andrea Franzetti
- Department of Earth and Environmental Sciences, University of Milano-Bicocca, Milano, Italy
| | - Sabrina Saponaro
- Department of Civil and Environmental Engineering, Politecnico di Milano, Milano, Italy
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Wang J, Chen M, Zhang J, Sun X, Li N, Wang X. Dynamic membrane filtration accelerates electroactive biofilms in bioelectrochemical systems. ENVIRONMENTAL SCIENCE AND ECOTECHNOLOGY 2024; 20:100375. [PMID: 38283869 PMCID: PMC10821169 DOI: 10.1016/j.ese.2023.100375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 12/19/2023] [Accepted: 12/20/2023] [Indexed: 01/30/2024]
Abstract
Bioelectrochemical systems (BES) have emerged as a dual-function technology for treating wastewater and recovering energy. A vital element of BES is the rapid formation and maintenance of electroactive biofilms (EABs). Previous attempts to accelerate EAB formation and improve electroactivities focused on enhancing the bacterial adhesion process while neglecting the rate-limiting step of the bacterial transport process. Here, we introduce membrane filtration into BES, establishing a dynamic membrane filtration system that enhances overall performance. We observed that optimal membrane flux considerably reduced the startup time for EAB formation. Specifically, EABs established under a 25 L m-2 h-1 flux (EAB25 LMH) had a formation time of 43.8 ± 1.3 h, notably faster than the 51.4 ± 1.6 h in the static state (EAB0 LMH). Additionally, EAB25 LMH exhibited a significant increase in maximum current density, approximately 2.2 times higher than EAB0 LMH. Pearson correlation analysis indicated a positive relationship between current densities and biomass quantities and an inverse correlation with startup time. Microbial analysis revealed two critical findings: (i) variations in maximum current densities across different filtration conditions were associated with redox-active substances and biomass accumulation, and (ii) the incorporation of a filtration process in EAB formation enhanced the proportion of viable cells and encouraged a more diverse range of electroactive bacteria. Moreover, the novel electroactive membrane demonstrated sustained current production and effective solid-liquid separation during prolonged operation, indicating its potential as a viable alternative in membrane-based systems. This approach not only provides a new operational model for BES but also holds promise for expanding its application in future wastewater treatment solutions.
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Affiliation(s)
- Jinning Wang
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin, 300350, China
| | - Mei Chen
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin, 300350, China
| | - Jiayao Zhang
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin, 300350, China
| | - Xinyi Sun
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin, 300350, China
| | - Nan Li
- School of Environmental Science and Engineering, Tianjin University, No. 35 Yaguan Road, Jinnan District, Tianjin, 300350, China
| | - Xin Wang
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin, 300350, China
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Ait-Itto FZ, Behan JA, Martinez M, Barrière F. Development of bioanodes rich in exoelectrogenic bacteria using iron-rich palaeomarine sediment inoculum. Bioelectrochemistry 2024; 156:108618. [PMID: 37988978 DOI: 10.1016/j.bioelechem.2023.108618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Revised: 11/16/2023] [Accepted: 11/17/2023] [Indexed: 11/23/2023]
Abstract
Microbial Fuel Cells (MFC) convert energy stored in chemicals into electrical energy thanks to exoelectrogenic microorganisms who also play a crucial role in geochemical cycles in their natural environment, including that of iron. In this study, we investigated paleomarine sediments as inoculum for bioanode development in MFCs. These sediments were formed under anoxic conditions ca. 113 million years ago and are rich in clay minerals, organic matter, and iron. The marlstone inoculum was incubated in the anolyte of an MFC using acetate as the added electron donor and ferricyanide as the electron acceptor in the catholyte. After seven weeks of incubation, the current density increased to 0.15 mA.cm-2 and a stable + 700 mV open circuit potential was reached. Community analysis revealed the presence of two exoelectrogenic bacterial genera, Geovibrio and Geobacter. Development of electroactive biofilms was correlated to bulk chemical transformations of the sediment inoculum with an increase in the Fe(II) to Fetotal ratio. Comparisons to sediments sterilized prior to inoculation confirmed that bioanode development derives from the native microbiota of these paleomarine sediments. This study illustrates the feasibility of developing exoelectrogenic biofilms from iron-rich marlstone and has implications for the role of such bacteria in broader paleoenvironmental phenomena.
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Affiliation(s)
- Fatima-Zahra Ait-Itto
- Université de Rennes, CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226, Rennes, France; Université de Rennes, CNRS, Géosciences de Rennes - UMR 6118, Rennes, France
| | - James A Behan
- Université de Rennes, CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226, Rennes, France
| | - Mathieu Martinez
- Université de Rennes, CNRS, Géosciences de Rennes - UMR 6118, Rennes, France
| | - Frédéric Barrière
- Université de Rennes, CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226, Rennes, France.
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Jiang Y, Dong Y, Sui M, Yu J, Wu J, Fu D. Towards a new understanding of bioelectrochemical systems from the perspective of microecosystems: A critical review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 908:168410. [PMID: 37939951 DOI: 10.1016/j.scitotenv.2023.168410] [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: 09/06/2023] [Revised: 11/04/2023] [Accepted: 11/05/2023] [Indexed: 11/10/2023]
Abstract
Bioelectrochemical system (BES) holds promise for sustainable energy generation and wastewater treatment. The microbial communities, as the core of BES, play a crucial role in its performance, thus needing to be systematically studied. However, researches considering microbial communities in BES from an ecological perspective are limited. This review provided a comprehensive summary of the BES with special emphasis on microecological principles, commencing with the dynamic formation and succession of the microbial communities. It also clarified the intricate interspecies relationships and quorum-sensing mechanisms regulated by dominant species. Furthermore, this review addressed the crucial themes in BES-related researches on ecological processes, including growth patterns, ecological structures, and defense strategies against external disturbances. By offering this novel perspective, it would contribute to enhancing the understanding of BES-centered technologies and facilitating future research in this field.
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Affiliation(s)
- Yiying Jiang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| | - Yue Dong
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| | - Mingrui Sui
- College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China.
| | - Jimeng Yu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| | - Jiaxin Wu
- College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
| | - Daxuan Fu
- College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
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Wang G, Chen L, Xing Y, Sun C, Fu P, Li Q, Chen R. Biochar establishing syntrophic partnership between exoelectrogens to facilitate extracellular electron transfer. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 904:166549. [PMID: 37633395 DOI: 10.1016/j.scitotenv.2023.166549] [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: 06/23/2023] [Revised: 07/31/2023] [Accepted: 08/23/2023] [Indexed: 08/28/2023]
Abstract
Biochar was regarded as a promising accelerator for extracellular electron transfer (EET), while the mechanism of biochar facilitating electricity harvest in bioelectrochemical system (BES) was in debates. In this study, sawdust-based biochar with low conductivity but strong redox-based electron exchange capacity was added into BES with two forms, including a suspended form (S-BC) added in anode chamber and a fixed form closely wrapping up the anode (F-BC). Compared with the control group, S-BC and F-BC addition dramatically increased accumulated electricity output by 2.0 and 5.1 times. However, electrochemical analysis characterized the lowest electrochemical property on anode surface in F-BC modified group. A 2nd period conducted by separating F-BC modified group with "aged F-BC + new anode" group and "single aged anode" group demonstrated that F-BC contributed >95 % to the current generation of F-BC modified group, while the anode almost acted as a conductor to transfer the generated electrons to cathode. Microbial community analysis revealed that both heterotrophic and autotrophic exoelectrogens contributed to current generation. The presence of biochar upregulated functional genes encoding cytochrome-c and type IV pilus, thereby boosting electricity harvest efficiency. Interestingly, the heterotrophic exoelectrogens of Geobacter/Desulfovibrio tended to attach on fixed surfaces of both biochar and anode, and the autotrophic exelectrogen of Hydrogenophaga was selectively enriched on biochar surfaces whatever fixed or suspended form. Consequently, a syntrophic partnership between Geobacter/Desulfovibrio and Hydrogenophaga was potentially establishment on F-BC surface for highly-efficient electricity harvest. In this syntrophic EET model, biochar potentially acted as the redox-active mediator, which temporarily accepted electron released by Geobacter/Desulfovibrio via acetate oxidation, and then donated them to Hydrogenophaga attached on biochar surfaces for autotrophic EET. This was distinct from a regular EET conducted by heterotrophic exoelectrogens. These findings provided new insights to understand the mechanisms of biochar facilitating EET by syntrophic metabolism pathway.
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Affiliation(s)
- Gaojun Wang
- Key Laboratory of Northwest Water Resource, Environment and Ecology (Ministry of Education), Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China; International S&T Cooperation Center for Urban Alternative Water Resources Development, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China
| | - Lu Chen
- Key Laboratory of Northwest Water Resource, Environment and Ecology (Ministry of Education), Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China
| | - Yao Xing
- Key Laboratory of Northwest Water Resource, Environment and Ecology (Ministry of Education), Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China; Xingrong (Xi'an) Environmental Development Co., No. 3160, Dazhai Road, Xi'an 710055, PR China
| | - Changxi Sun
- Key Laboratory of Northwest Water Resource, Environment and Ecology (Ministry of Education), Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China
| | - Peng Fu
- Key Laboratory of Northwest Water Resource, Environment and Ecology (Ministry of Education), Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China
| | - Qian Li
- Key Laboratory of Northwest Water Resource, Environment and Ecology (Ministry of Education), Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China; International S&T Cooperation Center for Urban Alternative Water Resources Development, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China; Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan
| | - Rong Chen
- Key Laboratory of Northwest Water Resource, Environment and Ecology (Ministry of Education), Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China; International S&T Cooperation Center for Urban Alternative Water Resources Development, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China.
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Zhao Q, Wang Y, Heng J, Ji M, Zhang J, Xie H, Dang Y, Wang Y, Hu Z. Comparison study on enhancement of phosphorus recovery from low-strength wastewater treated with different magnesium-based electrochemical constructed wetland. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 345:118840. [PMID: 37604105 DOI: 10.1016/j.jenvman.2023.118840] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 08/04/2023] [Accepted: 08/15/2023] [Indexed: 08/23/2023]
Abstract
Phosphorus (P) recovery from wastewaters treated with constructed wetlands (CWs) could alleviate the current global P crisis but has not received sufficient attention. In this study, P transformation in different magnesium-based electrochemical CWs, including micro-electrolysis CW (M-CW), primary battery CW (P-CW), and electrolysis CW (E-CW), was thoroughly examined. The results revealed that the P removal efficiency was 53.0%, 75.8%, and 61.9% in the M-CW, E-CW, and P-CW, respectively. P mass balance analysis showed that P electrode deposition was the main reason for the higher P removal in the E-CW and P-CW. Significant differences were found between the E-CW and P-CW, P was distributed primarily on the magnesium plate in the P-CW but was distributed on the carbon plate in the E-CW. The E-CW had excellent P recovery capacity, and struvite was the major P recovery product. More intense magnesium plate corrosion and alkaline environment increased struvite precipitation in the E-CW, with the proportion of 61.6%. The results of functional microbial community analysis revealed that the abundance of electroactive bacteria was positively correlated with the deposition of struvite. This study provided an essential reference for the targeted electrochemical regulation of electric field processes and microorganisms in CWs to enhance P recovery.
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Affiliation(s)
- Qian Zhao
- School of Environmental Science & Engineering, Shandong Key Laboratory of Water Pollution Control and Resource Reuse, Shandong University, Qingdao, 266237, PR China
| | - Yuru Wang
- School of Environmental Science & Engineering, Shandong Key Laboratory of Water Pollution Control and Resource Reuse, Shandong University, Qingdao, 266237, PR China
| | - Jiayang Heng
- School of Environmental Science & Engineering, Shandong Key Laboratory of Water Pollution Control and Resource Reuse, Shandong University, Qingdao, 266237, PR China
| | - Mingde Ji
- School of Environmental Science & Engineering, Shandong Key Laboratory of Water Pollution Control and Resource Reuse, Shandong University, Qingdao, 266237, PR China
| | - Jian Zhang
- School of Environmental Science & Engineering, Shandong Key Laboratory of Water Pollution Control and Resource Reuse, Shandong University, Qingdao, 266237, PR China
| | - Huijun Xie
- Environment Research Institute, Shandong University, Qingdao, 266237, PR China
| | - Yan Dang
- Beijing Key Laboratory for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control and Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, PR China
| | - Yuechang Wang
- Beijing Further Tide Eco-construction Co., Ltd, Beijing, 100012, PR China
| | - Zhen Hu
- School of Environmental Science & Engineering, Shandong Key Laboratory of Water Pollution Control and Resource Reuse, Shandong University, Qingdao, 266237, PR China.
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Philippon T, Ait-Itto FZ, Monfort A, Barrière F, Behan JA. Fe(III) oxide microparticles modulate extracellular electron transfer in anodic biofilms dominated by bacteria of the Pelobacter genus. Bioelectrochemistry 2023; 151:108394. [PMID: 36739700 DOI: 10.1016/j.bioelechem.2023.108394] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 01/27/2023] [Accepted: 01/28/2023] [Indexed: 02/04/2023]
Abstract
Exo-electrogenic microorganisms have been extensively studied for their ability to transfer electrons with solid surfaces using a large variety of metabolic pathways. Most of the studies on these microorganisms consist in the replacement of solid electron acceptors such as Fe(III) oxides found in nature by electrodes with the objective of generating harvestable current in devices such as microbial fuel cells. In this study we show how the presence of solid ferric oxide (Fe2O3) particles in the inoculum during bio-anode development influences extracellular electron transfer to the electrode. Amplification and sequencing of the 16S rRNA (V4-V5 region) show bacteria and archaea communities with a large predominance of the Pelobacter genus, which is known to be phylogenetically close to the Geobacter genus, regardless of the presence or absence of ferric oxide in the inoculum. Data indicate that the bacteria at the bio-anode surface can preferentially utilize solid ferric oxide as terminal electron acceptors instead of the anode, though extracellular electron transfer to the anode can be restored by removing the particles. Mixed inoculum commonly used to develop bioanodes may produce similar bacterial communities with divergent electrochemical responses due to the presence of alternate electron acceptors, with direct implications for microbial fuel cell performance.
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Affiliation(s)
- Timothé Philippon
- Université de Rennes, CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226, Rennes, France
| | - Fatima-Zahra Ait-Itto
- Université de Rennes, CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226, Rennes, France
| | - Alicia Monfort
- Université de Rennes, CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226, Rennes, France
| | - Frédéric Barrière
- Université de Rennes, CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226, Rennes, France.
| | - James A Behan
- Université de Rennes, CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226, Rennes, France.
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Yang Z, Li Y, Zhan Z, Song Y, Zhang L, Jin Y, Xu L, Wang J, Shen X, Liu L, Chen F. Enhanced power generation, organics removal and water desalination in a microbial desalination cell (MDC) with flow electrodes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 858:159914. [PMID: 36343800 DOI: 10.1016/j.scitotenv.2022.159914] [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: 07/26/2022] [Revised: 10/18/2022] [Accepted: 10/29/2022] [Indexed: 06/16/2023]
Abstract
This study introduced a flow electrode microbial desalination cell (FE-MDC), which used activated carbon (AC) particles and carbon nanotubes (CNTs) as the electrode to promote electron harvesting. The recovered electricity energy (0.371 KWh/m3) and columbic efficiency (66.7 %) of the FE-MDC were over 2 times higher than those of the conventional MDC without the flow electrode. Consequently, the salt and COD removal efficiencies were enhanced to 77.8 % and 91.2 %, respectively. Electrochemical analysis implied that the charge transfer resistance of the system was reduced by the flow electrode. Electron accumulation and charging-discharging experiments proved that the flow electrode could accumulate electrons and transfer the electrons to the fixed anode. Bacterial community analysis indicated that the bacterial activity was improved by the flow electrode. The content of the exoelectrogen Pseudomonas increased from 5.0 % to 14.7 %, and Hydrogenophaga improved from 1.4 % to 5.9 %. Finally, a continuous operation mode of the FE-MDC was established, and the flow electrode slurry was returned to the anodic chamber for recirculated utilization. The voltage output, COD removal, and salt removal during the operation mode reached 610 mV, 78.8 %, and 76.1 %, respectively. This study proved that the flow electrode is a promising way to promote the practical application of MDC technology.
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Affiliation(s)
- Zhigang Yang
- Resources and Environment Innovation Institute, Shandong Jianzhu University, Jinan 250101, China
| | - Yunfei Li
- School of Bioengineering, Shandong Polytechnic, Jinan 250104, China
| | - Ziyi Zhan
- Resources and Environment Innovation Institute, Shandong Jianzhu University, Jinan 250101, China; School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China
| | - Yang Song
- Resources and Environment Innovation Institute, Shandong Jianzhu University, Jinan 250101, China
| | - Lijie Zhang
- School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China
| | - Yan Jin
- School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China
| | - Linxu Xu
- Resources and Environment Innovation Institute, Shandong Jianzhu University, Jinan 250101, China
| | - Jin Wang
- Resources and Environment Innovation Institute, Shandong Jianzhu University, Jinan 250101, China
| | - Xue Shen
- Resources and Environment Innovation Institute, Shandong Jianzhu University, Jinan 250101, China
| | - Liming Liu
- Resources and Environment Innovation Institute, Shandong Jianzhu University, Jinan 250101, China
| | - Feiyong Chen
- Resources and Environment Innovation Institute, Shandong Jianzhu University, Jinan 250101, China.
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Halobacterium salinarum NRC-1 Sustains Voltage Production in a Dual-Chambered Closed Microbial Fuel Cell. ScientificWorldJournal 2022; 2022:3885745. [PMID: 36132437 PMCID: PMC9484973 DOI: 10.1155/2022/3885745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 06/24/2022] [Accepted: 08/18/2022] [Indexed: 12/03/2022] Open
Abstract
Sustained bioenergy production from organisms that thrive in high salinity, low oxygen, and low nutrition levels is useful in monitoring hypersaline polluted environments. Microbial fuel cell (MFC) studies utilizing single species halophiles under salt concentrations higher than 1 M and as a closed microbial system are limited. The current study aimed to establish baseline voltage, current, and power density from a dual-chambered MFC utilizing the halophile Halobacterium salinarum NRC-1. MFC performance was determined with two different electrode sizes (5 cm2 and 10 cm2), under oscillating and nonoscillating conditions, as well as in a stacked series. A closed dual-chamber MFC system of 100 mL capacity was devised with Halobacterium media (4.3 M salt concentration) as both anolyte and catholyte, with H. salinarum NRC-1 being the anodic organism. The MFC measured electrical output over 7, 14, 28, and 42 days. MFC output increased with 5 cm2 sized electrodes under nonoscillating (p < 0.0001) relative to oscillating conditions. However, under oscillating conditions, doubling the electrode size increased MFC output significantly (p = 0.01). The stacked series MFC, with an electrode size of 10 cm2, produced the highest power density (1.2672 mW/m2) over 14 days under oscillation. Our results highlight the potentiality of H. salinarum as a viable anodic organism to produce sustained voltage in a closed-MFC system.
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Wang S, Xu M, Jin B, Wünsch UJ, Su Y, Zhang Y. Electrochemical and microbiological response of exoelectrogenic biofilm to polyethylene microplastics in water. WATER RESEARCH 2022; 211:118046. [PMID: 35030360 DOI: 10.1016/j.watres.2022.118046] [Citation(s) in RCA: 34] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 12/25/2021] [Accepted: 01/05/2022] [Indexed: 06/14/2023]
Abstract
Exoelectrogenic biofilm and the associated microbial electrochemical processes have recently been intensively studied for water treatment, but their response to and interaction with polyethylene (PE) microplastics which are widespread in various aquatic environments has never been reported. Here, we investigated how and to what extent PE microplastics would affect the electrochemistry and microbiology of exoelectrogenic biofilm in both microbial fuel cells (MFCs) and microbial electrolysis cells (MECs). When the PE microplastics concentration was increased from 0 to 75 mg/L in the MECs, an apparent decline in the maximum current density (from 1.99 to 0.74 A/m2) and abundance of electroactive bacteria (EAB) in the exoelectrogenic biofilm was noticed. While in the MFCs, the current output was not significantly influenced and the abundance of EAB lightly increased at 25 mg/L microplastics. In addition, PE microplastics restrained the viability of the exoelectrogenic biofilms in both systems, leading to a higher system electrode resistance. Moreover, the microbial community richness and the microplastics-related operational taxonomic units decreased with PE microplastics. Furthermore, the electron transfer-related genes (e.g., pilA and mtrC) and cytochrome c concentration decreased after adding microplastics. This study provides the first glimpse into the influence of PE microplastics on the exoelectrogenic biofilm with the potential mechanisms revealed at the gene level, laying a methodological foundation for the future development of efficient water treatment technologies.
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Affiliation(s)
- Song Wang
- Department of Environmental Engineering, Technical University of Denmark, Lyngby DK-2800, Denmark
| | - Mingyi Xu
- Department of Environmental Engineering, Technical University of Denmark, Lyngby DK-2800, Denmark
| | - Biao Jin
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
| | - Urban J Wünsch
- Section for Oceans and Arctic, National Institute of Aquatic Resources, Technical University of Denmark, Kemitorvet, Kongens Lyngby 2800, Denmark
| | - Yanyan Su
- Carlsberg Research Laboratory, Bjerregaardsvej 5, Valby 2500, Denmark.
| | - Yifeng Zhang
- Department of Environmental Engineering, Technical University of Denmark, Lyngby DK-2800, Denmark.
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11
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Luo S, Liu F, Fu B, He K, Yang H, Zhang X, Liang P, Huang X. Onset Investigation on Dynamic Change of Biohythane Generation and Microbial Structure in Dual-chamber versus Single-chamber Microbial Electrolysis Cells. WATER RESEARCH 2021; 201:117326. [PMID: 34147740 DOI: 10.1016/j.watres.2021.117326] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 05/14/2021] [Accepted: 05/31/2021] [Indexed: 06/12/2023]
Abstract
Biohythane is alternative fuel to replace fossil fuel for car combustion, and biohythane generation could be potential pathway for energy recovery from wastewater treatment. Microbial electrolysis cell (MEC) is electrochemical technique to convert waste to methane and hydrogen gas for biohythane generation, but the feasibility and stability of MEC needs further investigation to assure sustainable energy recovery. System configuration is paramount factor for electrochemical reaction and mass transfer, and this study was to investigate the configuration impact (single vs dual chamber) of MEC for biohythane generation rate and stability. This study showed that dual-chamber MEC could separate methane and hydrogen gas production in the anode and cathode, and combined both together to produce biohythane. To reduce ohmic resistance for higher current, cation exchange membrane (CEM) was removed from dual-chamber to single-chamber MEC. However, free hydrogen diffusion was allowed in the single chamber since CEM was removed. The diffused hydrogen and substrate towards the cathode would favor the methanogen growth, and thus the hydrogen was consumed to reduce the biohythane generation and energy recovery efficiency (i.e., 7.5 × 10-3 reduced to 5.7 × 10-3 kWh kg-1 degraded COD day-1 after converting dual-chamber to single-chamber MEC). Absolute abundance of methanogen in single-chamber MEC was greatly boosted, as Methanosarcina and Methanobacteriale on the anode surface, increased by 132% and 243%, respectively, while the original dual-chamber MEC could maintain Geobacter growth for high current generation. This is the keystone study to demonstrate the importance of dual-chamber MEC for the feasibility and stability for the biohythane generation, building up the foundation to use electrochemical device to convert the organic waste to the alternative biohythane.
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Affiliation(s)
- Shuai Luo
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Fubin Liu
- Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO 63130, United States
| | - Boya Fu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Kai He
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430081, China
| | - Heng Yang
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430081, China
| | - Xiaoyuan Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Peng Liang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China.
| | - Xia Huang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China.
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12
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Yuan H, Wang X, Lin TY, Kim J, Liu WT. Disentangling the syntrophic electron transfer mechanisms of Candidatus geobacter eutrophica through electrochemical stimulation and machine learning. Sci Rep 2021; 11:15140. [PMID: 34302023 PMCID: PMC8302695 DOI: 10.1038/s41598-021-94628-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Accepted: 07/12/2021] [Indexed: 01/04/2023] Open
Abstract
Interspecies hydrogen transfer (IHT) and direct interspecies electron transfer (DIET) are two syntrophy models for methanogenesis. Their relative importance in methanogenic environments is still unclear. Our recent discovery of a novel species Candidatus Geobacter eutrophica with the genetic potential of IHT and DIET may serve as a model species to address this knowledge gap. To experimentally demonstrate its DIET ability, we performed electrochemical enrichment of Ca. G. eutrophica-dominating communities under 0 and 0.4 V vs. Ag/AgCl based on the presumption that DIET and extracellular electron transfer (EET) share similar metabolic pathways. After three batches of enrichment, Geobacter OTU650, which was phylogenetically close to Ca. G. eutrophica, was outcompeted in the control but remained abundant and active under electrochemical stimulation, indicating Ca. G. eutrophica's EET ability. The high-quality draft genome further showed high phylogenomic similarity with Ca. G. eutrophica, and the genes encoding outer membrane cytochromes and enzymes for hydrogen metabolism were actively expressed. A Bayesian network was trained with the genes encoding enzymes for alcohol metabolism, hydrogen metabolism, EET, and methanogenesis from dominant fermentative bacteria, Geobacter, and Methanobacterium. Methane production could not be accurately predicted when the genes for IHT were in silico knocked out, inferring its more important role in methanogenesis. The genomics-enabled machine learning modeling approach can provide predictive insights into the importance of IHT and DIET.
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Affiliation(s)
- Heyang Yuan
- Department of Civil and Environmental Engineering, University of Illinois, Urbana-Champaign, Urbana, IL, 61801, USA.
- Department of Civil and Environmental Engineering, Temple University, Philadelphia, PA, 19122, USA.
| | - Xuehao Wang
- Department of Civil and Environmental Engineering, University of Illinois, Urbana-Champaign, Urbana, IL, 61801, USA
| | - Tzu-Yu Lin
- Department of Civil and Environmental Engineering, University of Illinois, Urbana-Champaign, Urbana, IL, 61801, USA
| | - Jinha Kim
- Department of Civil and Environmental Engineering, University of Illinois, Urbana-Champaign, Urbana, IL, 61801, USA
| | - Wen-Tso Liu
- Department of Civil and Environmental Engineering, University of Illinois, Urbana-Champaign, Urbana, IL, 61801, USA.
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13
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Koffi NJ, Okabe S. Bioelectrochemical anoxic ammonium nitrogen removal by an MFC driven single chamber microbial electrolysis cell. CHEMOSPHERE 2021; 274:129715. [PMID: 33529951 DOI: 10.1016/j.chemosphere.2021.129715] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 01/12/2021] [Accepted: 01/17/2021] [Indexed: 05/27/2023]
Abstract
Nitrogen removal from wastewater is an indispensable but highly energy-demanding process, and thus more energy-saving treatment processes are required. Here, we investigated the performance of bioelectrochemical ammonium nitrogen (NH4+-N) removal from real domestic wastewater without energy-intensive aeration by a single chamber microbial electrolysis cell (MEC) that was electrically powered by a double chamber microbial fuel cell (MFC). Anoxic NH4+-N oxidation and total nitrogen (TN) removal rates were determined at various applied voltages (0-1.2 V), provided by the MFC. The MEC achieved a NH4+-N oxidation rate of 151 ± 42 g NH4+-N m-3 d-1 and TN removal rate of 95 ± 42 g-TN m-3 d-1 without aeration at the applied voltage of 0.8 V (the anode potential Eanode = +0.633 ± 0.218 V vs. SHE). These removal rates were much higher than the previously reported values and conventional biological nitrogen removal processes. Open and closed-circuit MEC batch experiments confirmed that anoxic NH4+-N oxidation was an electrochemically mediated biological process (that is, an anode acted as an electron acceptor) and denitrification occurred simultaneously without NO2- and NO3- accumulation. Moreover, ex-situ15N tracer experiment and microbial community analysis revealed that anammox and heterotrophic denitrification mainly contributed to the TN removal. Thus, the bioelectrochemical anodic NH4+-N oxidation was coupled with anammox and denitrification in this MFC-assisted MEC system. Taken together, our MFC-driven single chamber MEC could be a high rate energy-saving nitrogen removal process without external carbon and energy input and high energy-demanding aeration.
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Affiliation(s)
- N'Dah Joel Koffi
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, North-13, West-8, Kita-ku, Sapporo, Hokkaido, 060-8628, Japan
| | - Satoshi Okabe
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, North-13, West-8, Kita-ku, Sapporo, Hokkaido, 060-8628, Japan.
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14
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Flynn TM, Antonopoulos DA, Skinner KA, Brulc JM, Johnston E, Boyanov MI, Kwon MJ, Kemner KM, O’Loughlin EJ. Biogeochemical dynamics and microbial community development under sulfate- and iron-reducing conditions based on electron shuttle amendment. PLoS One 2021; 16:e0251883. [PMID: 34014980 PMCID: PMC8136678 DOI: 10.1371/journal.pone.0251883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 05/04/2021] [Indexed: 11/19/2022] Open
Abstract
Iron reduction and sulfate reduction are two of the major biogeochemical processes that occur in anoxic sediments. Microbes that catalyze these reactions are therefore some of the most abundant organisms in the subsurface, and some of the most important. Due to the variety of mechanisms that microbes employ to derive energy from these reactions, including the use of soluble electron shuttles, the dynamics between iron- and sulfate-reducing populations under changing biogeochemical conditions still elude complete characterization. Here, we amended experimental bioreactors comprised of freshwater aquifer sediment with ferric iron, sulfate, acetate, and the model electron shuttle AQDS (9,10-anthraquinone-2,6-disulfonate) and monitored both the changing redox conditions as well as changes in the microbial community over time. The addition of the electron shuttle AQDS did increase the initial rate of FeIII reduction; however, it had little effect on the composition of the microbial community. Our results show that in both AQDS- and AQDS+ systems there was an initial dominance of organisms classified as Geobacter (a genus of dissimilatory FeIII-reducing bacteria), after which sequences classified as Desulfosporosinus (a genus of dissimilatory sulfate-reducing bacteria) came to dominate both experimental systems. Furthermore, most of the ferric iron reduction occurred under this later, ostensibly “sulfate-reducing” phase of the experiment. This calls into question the usefulness of classifying subsurface sediments by the dominant microbial process alone because of their interrelated biogeochemical consequences. To better inform models of microbially-catalyzed subsurface processes, such interactions must be more thoroughly understood under a broad range of conditions.
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Affiliation(s)
- Theodore M. Flynn
- Biosciences Division, Argonne National Laboratory, Lemont, Illinois, United States of America
| | | | - Kelly A. Skinner
- Biosciences Division, Argonne National Laboratory, Lemont, Illinois, United States of America
| | - Jennifer M. Brulc
- Biosciences Division, Argonne National Laboratory, Lemont, Illinois, United States of America
| | - Eric Johnston
- Biosciences Division, Argonne National Laboratory, Lemont, Illinois, United States of America
| | - Maxim I. Boyanov
- Biosciences Division, Argonne National Laboratory, Lemont, Illinois, United States of America
- Institute of Chemical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Man Jae Kwon
- Biosciences Division, Argonne National Laboratory, Lemont, Illinois, United States of America
- Department of Earth and Environmental Sciences, Korea University, Seoul, South Korea
| | - Kenneth M. Kemner
- Biosciences Division, Argonne National Laboratory, Lemont, Illinois, United States of America
| | - Edward J. O’Loughlin
- Biosciences Division, Argonne National Laboratory, Lemont, Illinois, United States of America
- * E-mail:
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15
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Hou R, Gan L, Guan F, Wang Y, Li J, Zhou S, Yuan Y. Bioelectrochemically enhanced degradation of bisphenol S: mechanistic insights from stable isotope-assisted investigations. iScience 2021; 24:102014. [PMID: 33490921 PMCID: PMC7809511 DOI: 10.1016/j.isci.2020.102014] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 12/03/2020] [Accepted: 12/24/2020] [Indexed: 12/04/2022] Open
Abstract
Electroactive microbes is the driving force for the bioelectrochemical degradation of organic pollutants, but the underlying microbial interactions between electrogenesis and pollutant degradation have not been clearly identified. Here, we combined stable isotope-assisted metabolomics (SIAM) and 13C-DNA stable isotope probing (DNA-SIP) to investigate bisphenol S (BPS) enhanced degradation by electroactive mixed-culture biofilms (EABs). Using SIAM, six 13C fully labeled transformation products were detected originating via hydrolysis, oxidation, alkylation, or aromatic ring-cleavage reactions from 13C-BPS, suggesting hydrolysis and oxidation as the initial and key degradation pathways for the electrochemical degradation process. The DNA-SIP results further displayed high 13C-DNA accumulation in the genera Bacteroides and Cetobacterium from the EABs and indicated their ability in the assimilation of BPS or its metabolites. Collectively, network analysis showed that the collaboration between electroactive microbes and BPS assimilators played pivotal roles the improvement in bioelectrochemically enhanced BPS degradation.
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Affiliation(s)
- Rui Hou
- Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
| | - Lin Gan
- Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
| | - Fengyi Guan
- Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
| | - Yi Wang
- Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
| | - Jibing Li
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
| | - Shungui Zhou
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, School of Resources and Environment, Fujian Agriculture and Forestry, Fuzhou 350000, China
| | - Yong Yuan
- Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
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16
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Koók L, Nemestóthy N, Bélafi-Bakó K, Bakonyi P. Investigating the specific role of external load on the performance versus stability trade-off in microbial fuel cells. BIORESOURCE TECHNOLOGY 2020; 309:123313. [PMID: 32289659 DOI: 10.1016/j.biortech.2020.123313] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/31/2020] [Accepted: 04/01/2020] [Indexed: 06/11/2023]
Abstract
The performance and behavior of microbial fuel cells (MFCs) are influenced by among others the external load (Rext). In this study, the anode-surface biofilm formation in MFCs operated under different Rext selection/tracking-strategies was assessed. MFCs were characterized by electrochemical (voltage/current generation, polarization tests, EIS), molecular biological (microbial consortium analysis) and bioinformatics (principal component analysis) tools. The results indicated that the MFC with dynamic Rext adjustment (as a function of the actual MFC internal resistance) achieved notably higher performance but relatively lower operational stability, mainly due to the acidification of the biofilm. The opposite (lower performance, increased stability) could be observed with the static (low or high) Rext application (or OCV) strategies, where adaptive microbial processes were assumed. These possible adaptation phenomena were outlined by a theoretical framework and the significant impact of Rext on the anode colonization process and energy recovery with MFCs was concluded.
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Affiliation(s)
- László Koók
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem u. 10, 8200 Veszprém, Hungary
| | - Nándor Nemestóthy
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem u. 10, 8200 Veszprém, Hungary
| | - Katalin Bélafi-Bakó
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem u. 10, 8200 Veszprém, Hungary.
| | - Péter Bakonyi
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem u. 10, 8200 Veszprém, Hungary
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17
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Korth B, Kuchenbuch A, Harnisch F. Availability of Hydrogen Shapes the Microbial Abundance in Biofilm Anodes based on
Geobacter
Enrichment. ChemElectroChem 2020. [DOI: 10.1002/celc.202000731] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Benjamin Korth
- Department of Environmental Microbiology Helmholtz Centre for Environmental Research GmbH – UFZ Permoser Str. 15 04318 Leipzig Germany
| | - Anne Kuchenbuch
- Department of Environmental Microbiology Helmholtz Centre for Environmental Research GmbH – UFZ Permoser Str. 15 04318 Leipzig Germany
| | - Falk Harnisch
- Department of Environmental Microbiology Helmholtz Centre for Environmental Research GmbH – UFZ Permoser Str. 15 04318 Leipzig Germany
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18
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Korth B, Kretzschmar J, Bartz M, Kuchenbuch A, Harnisch F. Determining incremental coulombic efficiency and physiological parameters of early stage Geobacter spp. enrichment biofilms. PLoS One 2020; 15:e0234077. [PMID: 32559199 PMCID: PMC7304624 DOI: 10.1371/journal.pone.0234077] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Accepted: 05/18/2020] [Indexed: 01/06/2023] Open
Abstract
Geobacter spp. enrichment biofilms were cultivated in batch using one-chamber and two-chamber bioelectrochemical reactors. Time-resolved substrate quantification was performed to derive physiological parameters as well as incremental coulombic efficiency (i.e., coulombic efficiency during one batch cycle, here every 6h) during early stage biofilm development. The results of one-chamber reactors revealed an intermediate acetate increase putatively due to the presence of acetogens. Total coulombic efficiencies of two-chamber reactors were considerable lower (19.6±8.3% and 49.3±13.2% for 1st and 2nd batch cycle, respectively) compared to usually reported values of mature Geobacter spp. enrichment biofilms presumably reflecting energetic requirements for biomass production (i.e., cells and extracellular polymeric substances) during early stages of biofilm development. The incremental coulombic efficiency exhibits considerable changes during batch cycles indicating shifts between phases of maximizing metabolic rates and maximizing biomass yield. Analysis based on Michaelis-Menten kinetics yielded maximum substrate uptake rates (vmax,Ac, vmax,I) and half-saturation concentration coefficients (KM,Ac,KM,I) based on acetate uptake or current production, respectively. The latter is usually reported in literature but neglects energy demands for biofilm growth and maintenance as well as acetate and electron storage. From 1st to 2nd batch cycle, vmax,Ac and KM,Ac, decreased from 0.0042-0.0051 mmol Ac- h-1 cm-2 to 0.0031-0.0037 mmol Ac- h-1 cm-2 and 1.02-2.61 mM Ac- to 0.28-0.42 mM Ac-, respectively. Furthermore, differences between KM,Ac/KM,I and vmax,Ac/vmax,I were observed providing insights into the physiology of Geobacter spp. enrichment biofilms. Notably, KM,I considerably scattered while vmax,Ac/vmax,I and KM,Ac remained rather stable indicating that acetate transport within biofilm only marginally affects reaction rates. The observed data variation mandates the requirement of a more detailed analysis with an improved experimental system, e.g., using flow conditions and a comparison with Geobacter spp. pure cultures.
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Affiliation(s)
- Benjamin Korth
- Department of Environmental Microbiology, Helmholtz Centre for Environmental Research—UFZ, Leipzig, Saxony, Germany
| | - Jörg Kretzschmar
- Biochemical Conversion Department, DBFZ Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Leipzig, Saxony, Germany
| | - Manuel Bartz
- Department of Environmental Microbiology, Helmholtz Centre for Environmental Research—UFZ, Leipzig, Saxony, Germany
| | - Anne Kuchenbuch
- Department of Environmental Microbiology, Helmholtz Centre for Environmental Research—UFZ, Leipzig, Saxony, Germany
| | - Falk Harnisch
- Department of Environmental Microbiology, Helmholtz Centre for Environmental Research—UFZ, Leipzig, Saxony, Germany
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19
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Zhao F, Heidrich ES, Curtis TP, Dolfing J. Understanding the complexity of wastewater: The combined impacts of carbohydrates and sulphate on the performance of bioelectrochemical systems. WATER RESEARCH 2020; 176:115737. [PMID: 32240846 DOI: 10.1016/j.watres.2020.115737] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 03/11/2020] [Accepted: 03/17/2020] [Indexed: 06/11/2023]
Abstract
Bioelectrochemical systems (BES) have long been viewed as a promising wastewater treatment technology. However, in reality, the performance of bioelectrochemical systems fed with real (and therefore complex) wastewaters is often disappointing. We have sought to investigate the combined impacts of complex substrates and presence of electron acceptors. In particular, this study illustrates and systematically evaluates the disparity in performance between a BES acclimatised with acetate and those acclimatised with more complex carbohydrates (glucose, sucrose or starch) and in the presence and absence of sulphate. Relative to acetate only, operating with complex carbohydrates reduced current by 73%-87% and coulombic efficiency by 4%-50%. Acclimation with complex carbohydrates seriously impeded the colonisation anode by Geobacteraceae, resulting in substantially reduced capacity to produce current (60.2% on average). Combined acclimation with sulphate further reduced current by 35% on average, and resulted in a total reduction of 83%-93% relative to the acetate control. However, the presence of an electrogenic sulphide-sulphur shuttle meant sulphate had little effect on the coulombic efficiency of the BES. The results indicate that a reduction in current and coulombic efficiency is, at present, an unavoidable consequence of operating a BES fed with complex wastewater. Researchers, designers and policy makers should incorporate such losses in both their plans and their prognostications.
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Affiliation(s)
- Fei Zhao
- School of Engineering, Newcastle University, Newcastle-upon-Tyne, NE1 7RU, England, UK
| | - Elizabeth S Heidrich
- School of Engineering, Newcastle University, Newcastle-upon-Tyne, NE1 7RU, England, UK
| | - Thomas P Curtis
- School of Engineering, Newcastle University, Newcastle-upon-Tyne, NE1 7RU, England, UK
| | - Jan Dolfing
- School of Engineering, Newcastle University, Newcastle-upon-Tyne, NE1 7RU, England, UK.
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20
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Tarnovetskii IY, Merkel AY, Pimenov NV. Analysis of Cultured Methanogenic Archaea from the Tarkhankut Peninsula Coastal Methane Seeps. Microbiology (Reading) 2020. [DOI: 10.1134/s0026261719060183] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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21
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Wang W, Sheng Y. Pseudomonas sp. strain WJ04 enhances current generation of Synechocystis sp. PCC6803 in photomicrobial fuel cells. ALGAL RES 2019. [DOI: 10.1016/j.algal.2019.101490] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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22
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Wang HZ, Yan YC, Gou M, Yi Y, Xia ZY, Nobu MK, Narihiro T, Tang YQ. Response of Propionate-Degrading Methanogenic Microbial Communities to Inhibitory Conditions. Appl Biochem Biotechnol 2019; 189:233-248. [PMID: 30972704 DOI: 10.1007/s12010-019-03005-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Accepted: 03/27/2019] [Indexed: 10/27/2022]
Abstract
Propionate is a crucial intermediate during methane fermentation. Investigating the effects of different kinds of inhibitors on the propionate-degrading microbial community is necessary to develop countermeasures for improving process stability. In the present study, under inhibitory conditions (acetate, propionate, sulfide, and ammonium addition), the dynamic changes of the propionate-degrading microbial community from a mesophilic chemostat fed with propionate as the sole carbon source were investigated using high-throughput sequencing of 16S rRNA. Sulfide and/or ammonia inhibited specific species in the microbial community. Compared with Syntrophobacter, Smithella was more resistant to inhibition by sulfide and/or ammonia. However, Syntrophobacter demonstrated greater tolerance than Smithella under acid inhibition conditions. Some genera that had close phylogenetic relationships and similar functions showed similar responses to different inhibitors.
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Affiliation(s)
- Hui-Zhong Wang
- College of Architecture and Environment, Sichuan University, No. 24, South Section 1, First Ring Road, Chengdu, 610065, Sichuan, China
| | - Ying-Chun Yan
- Institute of New Energy and Low-Carbon Technology, Sichuan University, No. 24, South Section 1, First Ring Road, Chengdu, 610065, Sichuan, China
| | - Min Gou
- College of Architecture and Environment, Sichuan University, No. 24, South Section 1, First Ring Road, Chengdu, 610065, Sichuan, China
| | - Yue Yi
- College of Architecture and Environment, Sichuan University, No. 24, South Section 1, First Ring Road, Chengdu, 610065, Sichuan, China
| | - Zi-Yuan Xia
- College of Architecture and Environment, Sichuan University, No. 24, South Section 1, First Ring Road, Chengdu, 610065, Sichuan, China
| | - Masaru K Nobu
- Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
| | - Takashi Narihiro
- Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
| | - Yue-Qin Tang
- College of Architecture and Environment, Sichuan University, No. 24, South Section 1, First Ring Road, Chengdu, 610065, Sichuan, China.
- Institute of New Energy and Low-Carbon Technology, Sichuan University, No. 24, South Section 1, First Ring Road, Chengdu, 610065, Sichuan, China.
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23
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Kokko M, Epple S, Gescher J, Kerzenmacher S. Effects of wastewater constituents and operational conditions on the composition and dynamics of anodic microbial communities in bioelectrochemical systems. BIORESOURCE TECHNOLOGY 2018; 258:376-389. [PMID: 29548640 DOI: 10.1016/j.biortech.2018.01.090] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 01/17/2018] [Accepted: 01/19/2018] [Indexed: 06/08/2023]
Abstract
Over the last decade, there has been an ever-growing interest in bioelectrochemical systems (BES) as a sustainable technology enabling simultaneous wastewater treatment and biological production of, e.g. electricity, hydrogen, and further commodities. A key component of any BES degrading organic matter is the anode where electric current is biologically generated from the oxidation of organic compounds. The performance of BES depends on the interactions of the anodic microbial communities. To optimize the operational parameters and process design of BES a better comprehension of the microbial community dynamics and interactions at the anode is required. This paper reviews the abundance of different microorganisms in anodic biofilms and discusses their roles and possible side reactions with respect to their implications on the performance of BES utilizing wastewaters. The most important operational parameters affecting anodic microbial communities grown with wastewaters are highlighted and guidelines for controlling the composition of microbial communities are given.
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Affiliation(s)
- Marika Kokko
- Laboratory for MEMS Applications, IMTEK - Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany; Laboratory of Chemistry and Bioengineering, Tampere University of Technology, Tampere, Finland
| | - Stefanie Epple
- Institute for Applied Biosciences, Department of Applied Biology, Karlsruhe Institute of Technology, Fritz-Haber-Weg 2, 76131 Karlsruhe, Germany
| | - Johannes Gescher
- Institute for Applied Biosciences, Department of Applied Biology, Karlsruhe Institute of Technology, Fritz-Haber-Weg 2, 76131 Karlsruhe, Germany
| | - Sven Kerzenmacher
- Laboratory for MEMS Applications, IMTEK - Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany; Center for Environmental Research and Sustainable Technology (UFT), University of Bremen, Leobener Strasse 6, 28359 Bremen, Germany.
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Conductive Particles Enable Syntrophic Acetate Oxidation between Geobacter and Methanosarcina from Coastal Sediments. mBio 2018; 9:mBio.00226-18. [PMID: 29717006 PMCID: PMC5930305 DOI: 10.1128/mbio.00226-18] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Coastal sediments are rich in conductive particles, possibly affecting microbial processes for which acetate is a central intermediate. In the methanogenic zone, acetate is consumed by methanogens and/or syntrophic acetate-oxidizing (SAO) consortia. SAO consortia live under extreme thermodynamic pressure, and their survival depends on successful partnership. Here, we demonstrate that conductive particles enable the partnership between SAO bacteria (i.e., Geobacter spp.) and methanogens (Methanosarcina spp.) from the coastal sediments of the Bothnian Bay of the Baltic Sea. Baltic methanogenic sediments were rich in conductive minerals, had an apparent isotopic fractionation characteristic of CO2-reductive methanogenesis, and were inhabited by Geobacter and Methanosarcina. As long as conductive particles were delivered, Geobacter and Methanosarcina persisted, whereas exclusion of conductive particles led to the extinction of Geobacter. Baltic Geobacter did not establish a direct electric contact with Methanosarcina, necessitating conductive particles as electrical conduits. Within SAO consortia, Geobacter was an efficient [13C]acetate utilizer, accounting for 82% of the assimilation and 27% of the breakdown of acetate. Geobacter benefits from the association with the methanogen, because in the absence of an electron acceptor it can use Methanosarcina as a terminal electron sink. Consequently, inhibition of methanogenesis constrained the SAO activity of Geobacter as well. A potential benefit for Methanosarcina partnering with Geobacter is that together they competitively exclude acetoclastic methanogens like Methanothrix from an environment rich in conductive particles. Conductive particle-mediated SAO could explain the abundance of acetate oxidizers like Geobacter in the methanogenic zone of sediments where no electron acceptors other than CO2 are available. Acetate-oxidizing bacteria are known to thrive in mutualistic consortia in which H2 or formate is shuttled to a methane-producing Archaea partner. Here, we discovered that such bacteria could instead transfer electrons via conductive minerals. Mineral SAO (syntrophic acetate oxidation) could be a vital pathway for CO2-reductive methanogenesis in the environment, especially in sediments rich in conductive minerals. Mineral-facilitated SAO is therefore of potential importance for both iron and methane cycles in sediments and soils. Additionally, our observations imply that agricultural runoff or amendments with conductive chars could trigger a significant increase in methane emissions.
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Sun W, Krumins V, Dong Y, Gao P, Ma C, Hu M, Li B, Xia B, He Z, Xiong S. A Combination of Stable Isotope Probing, Illumina Sequencing, and Co-occurrence Network to Investigate Thermophilic Acetate- and Lactate-Utilizing Bacteria. MICROBIAL ECOLOGY 2018; 75:113-122. [PMID: 28669057 DOI: 10.1007/s00248-017-1017-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 06/12/2017] [Indexed: 06/07/2023]
Abstract
Anaerobic digestion is a complicated microbiological process that involves a wide diversity of microorganisms. Acetate is one of the most important intermediates, and interactions between acetate-oxidizing bacteria and archaea could play an important role in the formation of methane in anoxic environments. Anaerobic digestion at thermophilic temperatures is known to increase methane production, but the effects on the microbial community are largely unknown. In the current study, stable isotope probing was used to characterize acetate- and lactate-oxidizing bacteria in thermophilic anaerobic digestion. In microcosms fed 13C-acetate, bacteria related to members of Clostridium, Hydrogenophaga, Fervidobacterium, Spirochaeta, Limnohabitans, and Rhodococcus demonstrated elevated abundances of 13C-DNA fractions, suggesting their activities in acetate oxidation. In the treatments fed 13C-lactate, Anaeromyxobacter, Desulfobulbus, Syntrophus, Cystobacterineae, and Azospira were found to be the potential thermophilic lactate utilizers. PICRUSt predicted that enzymes related to nitrate and nitrite reduction would be enriched in 13C-DNA fractions, suggesting that the acetate and lactate oxidation may be coupled with nitrate and/or nitrite reduction. Co-occurrence network analysis indicated bacterial taxa not enriched in 13C-DNA fractions that may also play a critical role in thermophilic anaerobic digestion.
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Affiliation(s)
- Weimin Sun
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environment Science and Technology, Guangzhou, 510650, China.
| | - Valdis Krumins
- Department of Environmental Sciences, Rutgers University, New Brunswick, NJ, USA
| | - Yiran Dong
- Carl R. Woese Institute for Genomic Biology, University of Illinois, Urbana-Champaign, Urbana, IL, USA
| | - Pin Gao
- College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai, 201620, China.
| | - Chunyan Ma
- College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai, 201620, China
| | - Min Hu
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environment Science and Technology, Guangzhou, 510650, China
| | - Baoqin Li
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environment Science and Technology, Guangzhou, 510650, China
| | - Bingqing Xia
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environment Science and Technology, Guangzhou, 510650, China
| | - Zijun He
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environment Science and Technology, Guangzhou, 510650, China
| | - Shangling Xiong
- Biological and Environmental College, Zhejiang Wanli University, Ningbo, 315211, China
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Kronenberg M, Trably E, Bernet N, Patureau D. Biodegradation of polycyclic aromatic hydrocarbons: Using microbial bioelectrochemical systems to overcome an impasse. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 231:509-523. [PMID: 28841503 DOI: 10.1016/j.envpol.2017.08.048] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 08/09/2017] [Accepted: 08/11/2017] [Indexed: 05/22/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) are hardly biodegradable carcinogenic organic compounds. Bioremediation is a commonly used method for treating PAH contaminated environments such as soils, sediment, water bodies and wastewater. However, bioremediation has various drawbacks including the low abundance, diversity and activity of indigenous hydrocarbon degrading bacteria, their slow growth rates and especially a limited bioavailability of PAHs in the aqueous phase. Addition of nutrients, electron acceptors or co-substrates to enhance indigenous microbial activity is costly and added chemicals often diffuse away from the target compound, thus pointing out an impasse for the bioremediation of PAHs. A promising solution is the adoption of bioelectrochemical systems. They guarantee a permanent electron supply and withdrawal for microorganisms, thereby circumventing the traditional shortcomings of bioremediation. These systems combine biological treatment with electrochemical oxidation/reduction by supplying an anode and a cathode that serve as an electron exchange facility for the biocatalyst. Here, recent achievements in polycyclic aromatic hydrocarbon removal using bioelectrochemical systems have been reviewed. This also concerns PAH precursors: total petroleum hydrocarbons and diesel. Removal performances of PAH biodegradation in bioelectrochemical systems are discussed, focussing on configurational parameters such as anode and cathode designs as well as environmental parameters like porosity, salinity, adsorption and conductivity of soil and sediment that affect PAH biodegradation in BESs. The still scarcely available information on microbiological aspects of bioelectrochemical PAH removal is summarised here. This comprehensive review offers a better understanding of the parameters that affect the removal of PAHs within bioelectrochemical systems. In addition, future experimental setups are proposed in order to study syntrophic relationships between PAH degraders and exoelectrogens. This synopsis can help as guide for researchers in their choices for future experimental designs aiming at increasing the power densities and PAH biodegradation rates using microbial bioelectrochemistry.
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Affiliation(s)
| | - Eric Trably
- LBE, INRA, 102 avenue des Etangs, 11100 Narbonne, France
| | - Nicolas Bernet
- LBE, INRA, 102 avenue des Etangs, 11100 Narbonne, France
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Moscoviz R, de Fouchécour F, Santa-Catalina G, Bernet N, Trably E. Cooperative growth of Geobacter sulfurreducens and Clostridium pasteurianum with subsequent metabolic shift in glycerol fermentation. Sci Rep 2017; 7:44334. [PMID: 28287150 PMCID: PMC5347079 DOI: 10.1038/srep44334] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Accepted: 01/26/2017] [Indexed: 02/03/2023] Open
Abstract
Interspecies electron transfer is a common way to couple metabolic energy balances between different species in mixed culture consortia. Direct interspecies electron transfer (DIET) mechanism has been recently characterised with Geobacter species which couple the electron balance with other species through physical contacts. Using this mechanism could be an efficient and cost-effective way to directly control redox balances in co-culture fermentation. The present study deals with a co-culture of Geobacter sulfurreducens and Clostridium pasteurianum during glycerol fermentation. As a result, it was shown that Geobacter sulfurreducens was able to grow using Clostridium pasteurianum as sole electron acceptor. C. pasteurianum metabolic pattern was significantly altered towards improved 1,3-propanediol and butyrate production (+37% and +38% resp.) at the expense of butanol and ethanol production (−16% and −20% resp.). This metabolic shift was clearly induced by a small electron uptake that represented less than 0.6% of the electrons consumed by C. pasteurianum. A non-linear relationship was found between G. sulfurreducens growth (i.e the electrons transferred between the two species) and the changes in C. pasteurianum metabolite distribution. This study opens up new possibilities for controlling and increasing specificity in mixed culture fermentation.
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Affiliation(s)
- Roman Moscoviz
- LBE, INRA, 102 Avenue des étangs, 11100 Narbonne, France
| | | | | | - Nicolas Bernet
- LBE, INRA, 102 Avenue des étangs, 11100 Narbonne, France
| | - Eric Trably
- LBE, INRA, 102 Avenue des étangs, 11100 Narbonne, France
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28
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Optimization of Bioelectricity Generation in Constructed Wetland-Coupled Microbial Fuel Cell Systems. WATER 2017. [DOI: 10.3390/w9030185] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Yan Z, Zhang Y, Wu H, Yang M, Zhang H, Hao Z, Jiang H. Isolation and characterization of a bacterial strain Hydrogenophaga sp. PYR1 for anaerobic pyrene and benzo[a]pyrene biodegradation. RSC Adv 2017. [DOI: 10.1039/c7ra09274a] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A pyrene-degrading strainHydrogenophagasp. PYR1 was isolated from PAH-contaminated river sediments and found to be able to degrade high molecular weight-polycyclic aromatic hydrocarbons under both aerobic and anaerobic conditions.
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Affiliation(s)
- Zaisheng Yan
- State Key Laboratory of Lake Science and Environment
- Nanjing Institute of Geography and Limnology
- Chinese Academy of Sciences
- Nanjing
- China
| | - Yu Zhang
- State Key Laboratory of Lake Science and Environment
- Nanjing Institute of Geography and Limnology
- Chinese Academy of Sciences
- Nanjing
- China
| | - Huifang Wu
- College of Environment
- Nanjing University of Technology
- Nanjing
- China
| | - Mingzhong Yang
- State Key Laboratory of Lake Science and Environment
- Nanjing Institute of Geography and Limnology
- Chinese Academy of Sciences
- Nanjing
- China
| | - Haichen Zhang
- State Key Laboratory of Lake Science and Environment
- Nanjing Institute of Geography and Limnology
- Chinese Academy of Sciences
- Nanjing
- China
| | - Zheng Hao
- State Key Laboratory of Lake Science and Environment
- Nanjing Institute of Geography and Limnology
- Chinese Academy of Sciences
- Nanjing
- China
| | - Helong Jiang
- State Key Laboratory of Lake Science and Environment
- Nanjing Institute of Geography and Limnology
- Chinese Academy of Sciences
- Nanjing
- China
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Oyiwona GE, Ogbonna J, Anyanwu CU, Ishizaki S, Kimura ZI, Okabe S. Oxidation of glucose by syntrophic association between Geobacter and hydrogenotrophic methanogens in microbial fuel cell. Biotechnol Lett 2016; 39:253-259. [DOI: 10.1007/s10529-016-2247-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 10/26/2016] [Indexed: 10/20/2022]
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Microbe-microbe interactions trigger Mn(II)-oxidizing gene expression. ISME JOURNAL 2016; 11:67-77. [PMID: 27518809 DOI: 10.1038/ismej.2016.106] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Revised: 06/16/2016] [Accepted: 06/20/2016] [Indexed: 11/08/2022]
Abstract
Manganese (Mn) is an important metal in geochemical cycles. Some microorganisms can oxidize Mn(II) to Mn oxides, which can, in turn, affect the global cycles of other elements by strong sorption and oxidation effects. Microbe-microbe interactions have important roles in a number of biological processes. However, how microbial interactions affect Mn(II) oxidation still remains unknown. Here, we investigated the interactions between two bacteria (Arthrobacter sp. and Sphingopyxis sp.) in a co-culture, which exhibited Mn(II)-oxidizing activity, although neither were able to oxidize Mn(II) in isolation. We demonstrated that the Mn(II)-oxidizing activity in co-culture was most likely induced via contact-dependent interactions. The expressed Mn(II)-oxidizing protein in the co-culture was purified and identified as a bilirubin oxidase belonging to strain Arthrobacter. Full sequencing of the bilirubin oxidase-encoding gene (boxA) was performed. The Mn(II)-oxidizing protein and the transcripts of boxA were detected in the co-culture, but not in either of the isolated cultures. This indicate that boxA was silent in Arthrobacter monoculture, and was activated in response to presence of Sphingopyxis in the co-culture. Further, transcriptomic analysis by RNA-Seq, extracellular superoxide detection and cell density quantification by flow cytometry indicate induction of boxA gene expression in Arthrobacter was co-incident with a stress response triggered by co-cultivation with Sphingopyxis. Our findings suggest the potential roles of microbial physiological responses to stress induced by other microbes in Mn(II) oxidation and extracellular superoxide production.
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Zhao Z, Zhang Y, Holmes DE, Dang Y, Woodard TL, Nevin KP, Lovley DR. Potential enhancement of direct interspecies electron transfer for syntrophic metabolism of propionate and butyrate with biochar in up-flow anaerobic sludge blanket reactors. BIORESOURCE TECHNOLOGY 2016; 209:148-56. [PMID: 26967338 DOI: 10.1016/j.biortech.2016.03.005] [Citation(s) in RCA: 141] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2016] [Revised: 02/27/2016] [Accepted: 03/01/2016] [Indexed: 05/16/2023]
Abstract
Promoting direct interspecies electron transfer (DIET) to enhance syntrophic metabolism may be a strategy for accelerating the conversion of organic wastes to methane, but microorganisms capable of metabolizing propionate and butyrate via DIET under methanogenic conditions have yet to be identified. In an attempt to establish methanogenic communities metabolizing propionate or butyrate with DIET, enrichments were initiated with up-flow anaerobic sludge blanket (UASB), similar to those that were previously reported to support communities that metabolized ethanol with DIET that relied on direct biological electrical connections. In the absence of any amendments, microbial communities enriched were dominated by microorganisms closely related to pure cultures that are known to metabolize propionate or butyrate to acetate with production of H2. When biochar was added to the reactors there was a substantial enrichment on the biochar surface of 16S rRNA gene sequences closely related to Geobacter and Methanosaeta species known to participate in DIET.
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Affiliation(s)
- Zhiqiang Zhao
- Department of Microbiology, University of Massachusetts, Amherst, MA 01003-9298, USA; Key Laboratory of Industrial Ecology and Environmental Engineering (Dalian University of Technology), Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Yaobin Zhang
- Department of Microbiology, University of Massachusetts, Amherst, MA 01003-9298, USA; Key Laboratory of Industrial Ecology and Environmental Engineering (Dalian University of Technology), Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
| | - Dawn E Holmes
- Department of Microbiology, University of Massachusetts, Amherst, MA 01003-9298, USA; Physical and Biological Sciences, Western New England University, Springfield, MA, USA
| | - Yan Dang
- Department of Microbiology, University of Massachusetts, Amherst, MA 01003-9298, USA; Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, 35 Tsinghua East Road, Beijing 100083, China
| | - Trevor L Woodard
- Department of Microbiology, University of Massachusetts, Amherst, MA 01003-9298, USA
| | - Kelly P Nevin
- Department of Microbiology, University of Massachusetts, Amherst, MA 01003-9298, USA
| | - Derek R Lovley
- Department of Microbiology, University of Massachusetts, Amherst, MA 01003-9298, USA
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Hodgson DM, Smith A, Dahale S, Stratford JP, Li JV, Grüning A, Bushell ME, Marchesi JR, Avignone Rossa C. Segregation of the Anodic Microbial Communities in a Microbial Fuel Cell Cascade. Front Microbiol 2016; 7:699. [PMID: 27242723 PMCID: PMC4863660 DOI: 10.3389/fmicb.2016.00699] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Accepted: 04/26/2016] [Indexed: 11/13/2022] Open
Abstract
Metabolic interactions within microbial communities are essential for the efficient degradation of complex organic compounds, and underpin natural phenomena driven by microorganisms, such as the recycling of carbon-, nitrogen-, and sulfur-containing molecules. These metabolic interactions ultimately determine the function, activity and stability of the community, and therefore their understanding would be essential to steer processes where microbial communities are involved. This is exploited in the design of microbial fuel cells (MFCs), bioelectrochemical devices that convert the chemical energy present in substrates into electrical energy through the metabolic activity of microorganisms, either single species or communities. In this work, we analyzed the evolution of the microbial community structure in a cascade of MFCs inoculated with an anaerobic microbial community and continuously fed with a complex medium. The analysis of the composition of the anodic communities revealed the establishment of different communities in the anodes of the hydraulically connected MFCs, with a decrease in the abundance of fermentative taxa and a concurrent increase in respiratory taxa along the cascade. The analysis of the metabolites in the anodic suspension showed a metabolic shift between the first and last MFC, confirming the segregation of the anodic communities. Those results suggest a metabolic interaction mechanism between the predominant fermentative bacteria at the first stages of the cascade and the anaerobic respiratory electrogenic population in the latter stages, which is reflected in the observed increase in power output. We show that our experimental system represents an ideal platform for optimization of processes where the degradation of complex substrates is involved, as well as a potential tool for the study of metabolic interactions in complex microbial communities.
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Affiliation(s)
- Douglas M Hodgson
- Department of Microbial and Cellular Sciences, University of Surrey Guildford, UK
| | - Ann Smith
- Cardiff School of Biosciences, Cardiff University Cardiff, UK
| | - Sonal Dahale
- Department of Microbial and Cellular Sciences, University of Surrey Guildford, UK
| | - James P Stratford
- Warwick Integrative Synthetic Biology Centre, University of Warwick Coventry, UK
| | - Jia V Li
- Centre for Digestive and Gut Health, Department of Surgery and Cancer, Imperial College LondonLondon, UK; Division of Computational and Systems Medicine, Department of Surgery and Cancer, Imperial College LondonLondon, UK
| | - André Grüning
- Department of Computer Science, University of Surrey Guildford, UK
| | - Michael E Bushell
- Department of Microbial and Cellular Sciences, University of Surrey Guildford, UK
| | - Julian R Marchesi
- Cardiff School of Biosciences, Cardiff UniversityCardiff, UK; Centre for Digestive and Gut Health, Department of Surgery and Cancer, Imperial College LondonLondon, UK
| | - C Avignone Rossa
- Department of Microbial and Cellular Sciences, University of Surrey Guildford, UK
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Glycerol acts as alternative electron sink during syngas fermentation by thermophilic anaerobe Moorella thermoacetica. J Biosci Bioeng 2016; 121:268-73. [DOI: 10.1016/j.jbiosc.2015.07.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 07/07/2015] [Accepted: 07/08/2015] [Indexed: 01/03/2023]
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Biologically Induced Hydrogen Production Drives High Rate/High Efficiency Microbial Electrosynthesis of Acetate from Carbon Dioxide. ChemElectroChem 2016. [DOI: 10.1002/celc.201500530] [Citation(s) in RCA: 98] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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36
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White GF, Edwards MJ, Gomez-Perez L, Richardson DJ, Butt JN, Clarke TA. Mechanisms of Bacterial Extracellular Electron Exchange. Adv Microb Physiol 2016; 68:87-138. [PMID: 27134022 DOI: 10.1016/bs.ampbs.2016.02.002] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The biochemical mechanisms by which microbes interact with extracellular soluble metal ions and insoluble redox-active minerals have been the focus of intense research over the last three decades. The process presents two challenges to the microorganism. Firstly, electrons have to be transported at the cell surface, which in Gram-negative bacteria presents an additional problem of electron transfer across the ~6nm of the outer membrane. Secondly, the electrons must be transferred to or from the terminal electron acceptors or donors. This review covers the known mechanisms that bacteria use to transport electrons across the cell envelope to external electron donors/acceptors. In Gram-negative bacteria, electron transfer across the outer membrane involves the use of an outer membrane β-barrel and cytochrome. These can be in the form of a porin-cytochrome protein, such as Cyc2 of Acidithiobacillus ferrooxidans, or a multiprotein porin-cytochrome complex like MtrCAB of Shewanella oneidensis MR-1. For mineral-respiring organisms, there is the additional challenge of transferring the electrons from the cell to mineral surface. For the strict anaerobe Geobacter sulfurreducens this requires electron transfer through conductive pili to associated cytochrome OmcS that directly reduces Fe(III)oxides, while the facultative anaerobe S. oneidensis MR-1 accomplishes mineral reduction through direct membrane contact, contact through filamentous extensions and soluble flavin shuttles, all of which require the outer membrane cytochromes MtrC and OmcA in addition to secreted flavin.
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Affiliation(s)
- G F White
- School of Biological Sciences and School of Chemistry, University of East Anglia, Norwich, United Kingdom
| | - M J Edwards
- School of Biological Sciences and School of Chemistry, University of East Anglia, Norwich, United Kingdom
| | - L Gomez-Perez
- School of Biological Sciences and School of Chemistry, University of East Anglia, Norwich, United Kingdom
| | - D J Richardson
- School of Biological Sciences and School of Chemistry, University of East Anglia, Norwich, United Kingdom
| | - J N Butt
- School of Biological Sciences and School of Chemistry, University of East Anglia, Norwich, United Kingdom
| | - T A Clarke
- School of Biological Sciences and School of Chemistry, University of East Anglia, Norwich, United Kingdom.
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Successive bioanode regenerations to maintain efficient current production from biowaste. Bioelectrochemistry 2015; 106:133-40. [DOI: 10.1016/j.bioelechem.2015.05.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Revised: 04/17/2015] [Accepted: 05/06/2015] [Indexed: 01/05/2023]
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Jourdin L, Grieger T, Monetti J, Flexer V, Freguia S, Lu Y, Chen J, Romano M, Wallace GG, Keller J. High Acetic Acid Production Rate Obtained by Microbial Electrosynthesis from Carbon Dioxide. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:13566-13574. [PMID: 26484732 DOI: 10.1021/acs.est.5b03821] [Citation(s) in RCA: 139] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
High product specificity and production rate are regarded as key success parameters for large-scale applicability of a (bio)chemical reaction technology. Here, we report a significant performance enhancement in acetate formation from CO2, reaching comparable productivity levels as in industrial fermentation processes (volumetric production rate and product yield). A biocathode current density of -102 ± 1 A m(-2) and an acetic acid production rate of 685 ± 30 (g m(-2) day(-1)) have been achieved in this study. High recoveries of 94 ± 2% of the CO2 supplied as the sole carbon source and 100 ± 4% of electrons into the final product (acetic acid) were achieved after development of a mature biofilm, reaching an elevated product titer of up to 11 g L(-1). This high product specificity is remarkable for mixed microbial cultures, which would make the product downstream processing easier and the technology more attractive. This performance enhancement was enabled through the combination of a well-acclimatized and enriched microbial culture (very fast start-up after culture transfer), coupled with the use of a newly synthesized electrode material, EPD-3D. The throwing power of the electrophoretic deposition technique, a method suitable for large-scale production, was harnessed to form multiwalled carbon nanotube coatings onto reticulated vitreous carbon to generate a hierarchical porous structure.
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Affiliation(s)
- Ludovic Jourdin
- Advanced Water Management Centre, The University of Queensland , Level 4, Gehrmann Building (60), Brisbane, Queensland 4072, Australia
- Centre for Microbial Electrosynthesis, The University of Queensland , Level 4, Gehrmann Building (60), Brisbane, Queensland 4072, Australia
| | - Timothy Grieger
- Advanced Water Management Centre, The University of Queensland , Level 4, Gehrmann Building (60), Brisbane, Queensland 4072, Australia
| | - Juliette Monetti
- Advanced Water Management Centre, The University of Queensland , Level 4, Gehrmann Building (60), Brisbane, Queensland 4072, Australia
| | - Victoria Flexer
- Advanced Water Management Centre, The University of Queensland , Level 4, Gehrmann Building (60), Brisbane, Queensland 4072, Australia
| | - Stefano Freguia
- Advanced Water Management Centre, The University of Queensland , Level 4, Gehrmann Building (60), Brisbane, Queensland 4072, Australia
- Centre for Microbial Electrosynthesis, The University of Queensland , Level 4, Gehrmann Building (60), Brisbane, Queensland 4072, Australia
| | - Yang Lu
- Advanced Water Management Centre, The University of Queensland , Level 4, Gehrmann Building (60), Brisbane, Queensland 4072, Australia
| | - Jun Chen
- RC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, AIIM Facility, Innovation Campus, University of Wollongong , Wollongong, NSW 2522, Australia
| | - Mark Romano
- RC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, AIIM Facility, Innovation Campus, University of Wollongong , Wollongong, NSW 2522, Australia
| | - Gordon G Wallace
- RC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, AIIM Facility, Innovation Campus, University of Wollongong , Wollongong, NSW 2522, Australia
| | - Jurg Keller
- Advanced Water Management Centre, The University of Queensland , Level 4, Gehrmann Building (60), Brisbane, Queensland 4072, Australia
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Perspective of harnessing energy from landfill leachate via microbial fuel cells: novel biofuels and electrogenic physiologies. Appl Microbiol Biotechnol 2015; 99:7827-36. [DOI: 10.1007/s00253-015-6857-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Revised: 07/14/2015] [Accepted: 07/16/2015] [Indexed: 10/23/2022]
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Yamashita T, Ishida M, Ogino A, Yokoyama H. Evaluation of organic matter removal and electricity generation by using integrated microbial fuel cells for wastewater treatment. ENVIRONMENTAL TECHNOLOGY 2015; 37:228-236. [PMID: 26118304 DOI: 10.1080/09593330.2015.1066874] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A floating all-in-one type of microbial fuel cell (Fa-MFC) that allows simple operation and installation in existing wastewater reservoirs for decomposition of organic matter was designed. A prototype cell was constructed by fixing a tubular floater to an assembly composed of a proton-exchange membrane and an air-cathode. To compare anode materials, carbon-cloth anodes or carbon-brush anodes were included in the assembly. The fabricated assemblies were floated in 1-L beakers filled with acetate medium. Both reactors removed acetate at a rate of 133-181 mg/L/d. The Fa-MFC quipped with brush anodes generated a 1.7-fold higher maximum power density (197 mW/m(2)-cathode area) than did that with cloth anodes (119 mW/m(2)-cathode area). To evaluate the performance of the Fa-MFCs on more realistic substrates, artificial wastewater, containing peptone and meat extract, was placed in a 2-L beaker, and the Fa-MFC with brush anodes was floated in the beaker. The Fa-MFC removed the chemical oxygen demand of the wastewater at a rate of 465-1029 mg/L/d, and generated a maximum power density of 152 mW/m(2)-cathode area. When the Fa-MFC was fed with actual livestock wastewater, the biological oxygen demand of the wastewater was removed at a rate of 45-119 mg/L/d, with electricity generation of 95 mW/m(2)-cathode area. Bacteria related to Geobacter sulfurreducens were predominantly detected in the anode biofilm, as deduced from the analysis of the 16S rRNA gene sequence.
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MESH Headings
- Bacteria/genetics
- Bacteria/metabolism
- Bioelectric Energy Sources
- Bioreactors/microbiology
- DNA, Bacterial/genetics
- DNA, Bacterial/metabolism
- Geobacter/genetics
- Geobacter/metabolism
- Molecular Sequence Data
- RNA, Ribosomal, 16S/genetics
- RNA, Ribosomal, 16S/metabolism
- Sequence Analysis, DNA
- Waste Disposal, Fluid/instrumentation
- Waste Disposal, Fluid/methods
- Wastewater/analysis
- Water Pollutants, Chemical/metabolism
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Affiliation(s)
- Takahiro Yamashita
- a Animal Waste Management and Environment Division , NARO Institute of Livestock and Grassland Science , 2 Ikenodai, Tsukuba , Ibaraki 305-0901 , Japan
| | - Mitsuyoshi Ishida
- a Animal Waste Management and Environment Division , NARO Institute of Livestock and Grassland Science , 2 Ikenodai, Tsukuba , Ibaraki 305-0901 , Japan
| | - Akifumi Ogino
- a Animal Waste Management and Environment Division , NARO Institute of Livestock and Grassland Science , 2 Ikenodai, Tsukuba , Ibaraki 305-0901 , Japan
| | - Hiroshi Yokoyama
- a Animal Waste Management and Environment Division , NARO Institute of Livestock and Grassland Science , 2 Ikenodai, Tsukuba , Ibaraki 305-0901 , Japan
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Song Y, Xiao L, Jayamani I, He Z, Cupples AM. A novel method to characterize bacterial communities affected by carbon source and electricity generation in microbial fuel cells using stable isotope probing and Illumina sequencing. J Microbiol Methods 2015; 108:4-11. [DOI: 10.1016/j.mimet.2014.10.010] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 10/17/2014] [Accepted: 10/20/2014] [Indexed: 11/29/2022]
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Zhi W, Ge Z, He Z, Zhang H. Methods for understanding microbial community structures and functions in microbial fuel cells: a review. BIORESOURCE TECHNOLOGY 2014; 171:461-468. [PMID: 25223851 DOI: 10.1016/j.biortech.2014.08.096] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2014] [Revised: 08/21/2014] [Accepted: 08/22/2014] [Indexed: 06/03/2023]
Abstract
Microbial fuel cells (MFCs) employ microorganisms to recover electric energy from organic matter. However, fundamental knowledge of electrochemically active bacteria is still required to maximize MFCs power output for practical applications. This review presents microbiological and electrochemical techniques to help researchers choose the appropriate methods for the MFCs study. Pre-genomic and genomic techniques such as 16S rRNA based phylogeny and metagenomics have provided important information in the structure and genetic potential of electrode-colonizing microbial communities. Post-genomic techniques such as metatranscriptomics allow functional characterizations of electrode biofilm communities by quantifying gene expression levels. Isotope-assisted phylogenetic analysis can further link taxonomic information to microbial metabolisms. A combination of electrochemical, phylogenetic, metagenomic, and post-metagenomic techniques offers opportunities to a better understanding of the extracellular electron transfer process, which in turn can lead to process optimization for power output.
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Affiliation(s)
- Wei Zhi
- Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
| | - Zheng Ge
- Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
| | - Zhen He
- Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
| | - Husen Zhang
- Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA.
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Ishizaki S, Fujiki I, Sano D, Okabe S. External CO2 and water supplies for enhancing electrical power generation of air-cathode microbial fuel cells. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:11204-11210. [PMID: 25181008 DOI: 10.1021/es5021197] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Alkalization on the cathode electrode limits the electrical power generation of air-cathode microbial fuel cells (MFCs), and thus external proton supply to the cathode electrode is essential to enhance the electrical power generation. In this study, the effects of external CO2 and water supplies to the cathode electrode on the electrical power generation were investigated, and then the relative contributions of CO2 and water supplies to the total proton consumption were experimentally evaluated. The CO2 supply decreased the cathode pH and consequently increased the power generation. Carbonate dissolution was the main proton source under ambient air conditions, which provides about 67% of total protons consumed for the cathode reaction. It is also critical to adequately control the water content on the cathode electrode of air-cathode MFCs because the carbonate dissolution was highly dependent on water content. On the basis of these experimental results, the power density was increased by 400% (143.0 ± 3.5 mW/m(2) to 575.0 ± 36.0 mW/m(2)) by supplying a humid gas containing 50% CO2 to the cathode chamber. This study demonstrates that the simultaneous CO2 and water supplies to the cathode electrode were effective to increase the electrical power generation of air-cathode MFCs for the first time.
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Affiliation(s)
- So Ishizaki
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University , North 13, West 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
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Dhar BR, Lee HS. Evaluation of limiting factors for current density in microbial electrochemical cells (MXCs) treating domestic wastewater. ACTA ACUST UNITED AC 2014. [PMID: 28626666 PMCID: PMC5466131 DOI: 10.1016/j.btre.2014.09.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
This study quantitatively assessed three limiting factors for current density in a microbial electrochemical cell (MXC) treating domestic wastewater: (1) buffer concentration, (2) biodegradability, and (3) particulates. Buffer concentration was not significant for current density in the MXC fed with filtered domestic wastewater (180 mg COD/L). Current density reduced by 67% in the MXC fed with filtered sewage having similar COD concentration to acetate medium, which indicates poor biodegradability of soluble organics in the wastewater. Particulate matters seriously decreased current density down to 76%, probably due to the accumulation of particulates on biofilm anode. Our study quantitatively showed that buffer concentration does not limit current density much, but biodegradability of soluble organics and fermentation rate of particulate matters in domestic wastewater mainly control current density in MXCs.
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Affiliation(s)
- Bipro Ranjan Dhar
- Department of Civil and Environmental Engineering, University of Waterloo, 200 University Avenue West Waterloo, ON N2L 3G1, Canada
| | - Hyung-Sool Lee
- Department of Civil and Environmental Engineering, University of Waterloo, 200 University Avenue West Waterloo, ON N2L 3G1, Canada
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Park TJ, Ding W, Cheng S, Brar MS, Ma APY, Tun HM, Leung FC. Microbial community in microbial fuel cell (MFC) medium and effluent enriched with purple photosynthetic bacterium (Rhodopseudomonas sp.). AMB Express 2014; 4:22. [PMID: 24949257 PMCID: PMC4052673 DOI: 10.1186/s13568-014-0022-2] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Accepted: 01/20/2014] [Indexed: 12/24/2022] Open
Abstract
High power densities have been obtained from MFC reactors having a purple color characteristic of Rhodopseudomonas. We investigated the microbial community structure and population in developed purple MFC medium (DPMM) and MFC effluent (DPME) using 16S rRNA pyrosequencing. In DPMM, dominant bacteria were Comamonas (44.6%), Rhodopseudomonas (19.5%) and Pseudomonas (17.2%). The bacterial community of DPME mainly consisted of bacteria related to Rhodopseudomonas (72.2%). Hydrogen oxidizing bacteria were identified in both purple-colored samples: Hydrogenophaga and Sphaerochaeta in the DPMM, and Arcobacter, unclassified Ignavibacteriaceae, Acinetobacter, Desulfovibrio and Wolinella in the DPME. The methanogenic community of both purple-colored samples was dominated by hydrogenotrophic methanogens including Methanobacterium, Methanobrevibacter and Methanocorpusculum with significantly lower numbers of Methanosarcina. These results suggeste that hydrogen is actively produced by Rhodopseudomonas that leads to the dominance of hydrogen consuming microorganisms in both purple-colored samples. The syntrophic relationship between Rhodopseudomonas and hydrogenotrophic microbes might be important for producing high power density in the acetate-fed MFC under light conditions.
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Zhu X, Yates MD, Hatzell MC, Ananda Rao H, Saikaly PE, Logan BE. Microbial community composition is unaffected by anode potential. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:1352-1358. [PMID: 24364567 DOI: 10.1021/es404690q] [Citation(s) in RCA: 102] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
There is great controversy on how different set anode potentials affect the performance of a bioelectrochemical system (BES). It is often reported that more positive potentials improve acclimation and performance of exoelectrogenic biofilms, and alter microbial community structure, while in other studies relatively more negative potentials were needed to achieve higher current densities. To address this issue, the biomass, electroactivity, and community structure of anodic biofilms were examined over a wide range of set anode potentials (-0.25, -0.09, 0.21, 0.51, and 0.81 V vs a standard hydrogen electrode, SHE) in single-chamber microbial electrolysis cells. Maximum currents produced using a wastewater inoculum increased with anode potentials in the range of -0.25 to 0.21 V, but decreased at 0.51 and 0.81 V. The maximum currents were positively correlated with increasing biofilm biomass. Pyrosequencing indicated biofilm communities were all similar and dominated by bacteria most similar to Geobacter sulfurreducens. Differences in anode performance with various set potentials suggest that the exoelectrogenic communities self-regulate their exocellular electron transfer pathways to adapt to different anode potentials.
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Affiliation(s)
- Xiuping Zhu
- Department of Civil and Environmental Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
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