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Mugnai G, Bernabò L, Daly G, Corneli E, Adessi A. Photofermentative production of poly-β-hydroxybutyrate (PHB) by purple non-sulfur bacteria using olive oil by-products. BIORESOUR BIOPROCESS 2025; 12:25. [PMID: 40128444 PMCID: PMC11933499 DOI: 10.1186/s40643-025-00856-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2024] [Accepted: 02/22/2025] [Indexed: 03/26/2025] Open
Abstract
This study evaluated the ability of six purple non-sulfur bacteria (PNSB) to convert olive oil by-products into poly-β-hydroxybutyrate (PHB). Strains were first independently cultivated in synthetic media with different carbon sources (acetic, lactic and malic acid) to assess their physiology and PHB production. Subsequently, their growth and PHB production using ingested pâté olive cake (IPOC) as a substrate were investigated. Transmission electron microscopy (TEM) observations were conducted on strains cultivated on IPOC to investigate their cell morphologies and inclusion bodies presence and size. Rhodopseudomonas palustris strains accumulated up to 6.8% w PHB/w cells with acetate and 0.86% w PHB/w cells with a daily productivity of 0.54 mg PHB L⁻1 culture d⁻1 on IPOC. In contrast, Cereibacter johrii and Cereibacter sphaeroides reached 58.64% w PHB/w cells and 65.45% w PHB/w cells with acetate, respectively, while C. sphaeroides achieved 21.48% w PHB/w cells and a daily productivity of 10.85 mg PHB L⁻1 culture d⁻1 when cultivated on IPOC. All strains exhibited growth and PHB accumulation in both synthetic media and IPOC substrate. Specifically, R. palustris strains 42OL, AV33 and CGA009 displayed growth capability in all substrates, while C. johrii strains 9Cis and PISA 7, and C. sphaeroides F17 showed promising PHB synthesis capabilities. TEM observations revealed that R. palustris strains, with smaller cell and inclusion body sizes, exhibited lower PHB accumulations, while C. johrii and C. sphaeroides strains, characterized by larger cells and inclusion bodies, demonstrated higher PHB production, recognizing them as promising candidates for PHB production using olive oil by-products. Further investigations under laboratory-scale conditions will be necessary to optimize operating parameters and develop integrated strategies for simultaneous PHB synthesis and the co-production of value-added products, thereby enhancing the economic feasibility of the process within a biorefinery framework.
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Affiliation(s)
- Gianmarco Mugnai
- Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Florence, Piazzale Delle Cascine, 18, 50144, Florence, Italy
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Borgo XX Giugno, 74, 06121, Perugia, Italy
| | - Luca Bernabò
- Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Florence, Piazzale Delle Cascine, 18, 50144, Florence, Italy
| | - Giulia Daly
- Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Florence, Piazzale Delle Cascine, 18, 50144, Florence, Italy
| | - Elisa Corneli
- Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Florence, Piazzale Delle Cascine, 18, 50144, Florence, Italy
- PhotoB. Srl, Via Montecalvi, 3, San Casciano in Val Di Pesa, 50026, Florence, Italy
| | - Alessandra Adessi
- Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Florence, Piazzale Delle Cascine, 18, 50144, Florence, Italy.
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Correa-Villa C, Moreno-Cárdenas E, de Bruijn J. Presence of lactic acid bacteria in hydrogen production by dark fermentation: competition or synergy. World J Microbiol Biotechnol 2024; 40:380. [PMID: 39532795 DOI: 10.1007/s11274-024-04167-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2024] [Accepted: 10/11/2024] [Indexed: 11/16/2024]
Abstract
Dark fermentation in mixed cultures has been extensively studied due to its great potential for sustainable hydrogen production from organic wastes. However, microbial composition, substrate competition, and inhibition by fermentation products can affect hydrogen yield and production rates. Lactic acid bacteria have been identified as the key organisms in this process. On one hand, lactic acid bacteria can efficiently compete for carbohydrate rich substrates, producing lactic acid and secreting bacteriocins that inhibit the growth of hydrogen-producing bacteria, thereby decreasing hydrogen production. On the other hand, due to their metabolic capacity and synergistic interactions with certain hydrogen-producing bacteria, they contribute positively in several ways, for example by providing lactic acid as a substrate for hydrogen generation. Analyzing different perspectives about the role of lactic acid bacteria in hydrogen production by dark fermentation, a literature review was done on this topic. This review article shows a comprehensive view to understand better the role of these bacteria and their influence on the process efficiency, either as competitors or as contributors to hydrogen production by dark fermentation.
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Affiliation(s)
- Cindy Correa-Villa
- Facultad de Ingeniería Agrícola, Universidad de Concepción, 3780000, Chillán, Ñuble, Chile.
| | - Edilson Moreno-Cárdenas
- Departamento de Ingeniería Agrícola y de Alimentos, Universidad Nacional de Colombia-Sede Medellín, 050034, Antioquia, Colombia
| | - Johannes de Bruijn
- Facultad de Ingeniería Agrícola, Universidad de Concepción, 3780000, Chillán, Ñuble, Chile
- Centro de Desarrollo Tecnológico Agroindustrial, Facultad de Ingeniería Agrícola, Universidad de Concepción, 4440000, Los Ángeles, Biobio, Chile
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Sanghvi AH, Manjoo A, Rajput P, Mahajan N, Rajamohan N, Abrar I. Advancements in biohydrogen production - a comprehensive review of technologies, lifecycle analysis, and future scope. RSC Adv 2024; 14:36868-36885. [PMID: 39559569 PMCID: PMC11572884 DOI: 10.1039/d4ra06214k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2024] [Accepted: 11/04/2024] [Indexed: 11/20/2024] Open
Abstract
The global shift towards sustainable energy sources, necessitated by climate change concerns, has led to a critical review of biohydrogen production (BHP) processes and their potential as a solution to environmental challenges. This review evaluates the efficiency of various reactors used in BHP, focusing on operational parameters such as substrate type, pH, temperature, hydraulic retention time (HRT), and organic loading rate (OLR). The highest yield reported in batch, continuous, and membrane reactors was in the range of 29-40 L H2/L per day at an OLR of 22-120 g/L per day, HRT of 2-3 h and acidic range of 4-6, with the temperature maintained at 37 °C. The highest yield achieved was 208.3 L H2/L per day when sugar beet molasses was used as a substrate with Clostridium at an OLR of 850 g COD/L per day, pH of 4.4, and at 8 h HRT. The integration of artificial intelligence (AI) tools, such as artificial neural networks and support vector machines has emerged as a novel approach for optimizing reactor performance and predicting outcomes. These AI models help in identifying key operational parameters and their optimal ranges, thus enhancing the efficiency and reliability of BHP processes. The review also draws attention to the importance of life cycle and techno-economic analyses in assessing the environmental impact and economic viability of BHP, addressing potential challenges like high operating costs and energy demands during scale-up. Future research should focus on developing more efficient and cost-effective BHP systems, integrating advanced AI techniques for real-time optimization, and conducting comprehensive LCA and TEA to ensure sustainable and economically viable biohydrogen production. By addressing these areas, BHP can become a key component of the transition to sustainable energy sources, contributing to the reduction of greenhouse gas emissions and the mitigation of environmental impacts associated with fossil fuel use.
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Affiliation(s)
- Aarnav Hetan Sanghvi
- Department of Electrical & Electronics Engineering, Birla Institute of Technology and Science, Pilani - Hyderabad Campus Shameerpet Hyderabad Telangana-500078 India
| | - Amarjith Manjoo
- Department of Chemical Engineering, Birla Institute of Technology and Science, Pilani - Hyderabad Campus Shameerpet Hyderabad Telangana-500078 India
| | - Prachi Rajput
- Department of Chemical Engineering, Birla Institute of Technology and Science, Pilani - Hyderabad Campus Shameerpet Hyderabad Telangana-500078 India
| | - Navya Mahajan
- Department of Chemical Engineering, Birla Institute of Technology and Science, Pilani - Hyderabad Campus Shameerpet Hyderabad Telangana-500078 India
| | - Natarajan Rajamohan
- Chemical Engineering Section, Faculty of Engineering, Sohar University Sohar P C-311 Oman
| | - Iyman Abrar
- Department of Chemical Engineering, Birla Institute of Technology and Science, Pilani - Hyderabad Campus Shameerpet Hyderabad Telangana-500078 India
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Cheng HH, Whang LM. Applying metabolic flux analysis to hydrogen fermentation using a metabolic network constructed for anaerobic mixed cultures. ENVIRONMENTAL RESEARCH 2023; 235:116636. [PMID: 37442252 DOI: 10.1016/j.envres.2023.116636] [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: 04/29/2023] [Revised: 07/06/2023] [Accepted: 07/10/2023] [Indexed: 07/15/2023]
Abstract
In this study, a mixed-cultural metabolic network for anaerobic digestion that included the concept of a "universal bacterium" was constructed, and metabolic flux analysis (MFA) applying this network was conducted to evaluate the flow of electrons and materials during H2 fermentation under various conditions. The MFA results from two H2 fermenters feeding glucose with (GP) or without (GA) the addition of peptone suggest that hydraulic retention time (HRT) presents a significant impact on hydrogen production, and the reversed trends could be observed at HRTs below and above 4 h. From the MFA results of lactate/acetate-fed H2 fermenter, the highest flux of H2 production is associated with more significant acetate consumption and the following pathways toward the anaplerotic reactions cycle that produces NADH. The occurrence of acetogenesis in the H2 fermenters using various types of bioethanol-fermented residues (BEFRs) was also identified according to the MFA results. By analyzing the MFA results of all 49 sets of data from H2 fermenters via Pearson's correlation, it was revealed that the flux of H2 production positively correlates to the reduction of ferredoxin with pyruvate oxidation, acetate formation, and acetate emission when lactate was produced in the system. On the contrary, negative relationships were found between the flux of H2 production and these three fluxes. The extended application of MFA provides additional information, including the fluxes between intracellular metabolites, and the information has the potential to be used in decision-making systems during the future operation of anaerobic processes by connecting operational parameters.
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Affiliation(s)
- Hai-Hsuan Cheng
- Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan
| | - Liang-Ming Whang
- Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan; Sustainable Environment Research Laboratory (SERL), National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan.
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5
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Cui Z, Zheng M, Ding M, Dai W, Wang Z, Chen T. Efficient production of acetoin from lactate by engineered Escherichia coli whole-cell biocatalyst. Appl Microbiol Biotechnol 2023:10.1007/s00253-023-12560-x. [PMID: 37178309 DOI: 10.1007/s00253-023-12560-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 04/24/2023] [Accepted: 04/27/2023] [Indexed: 05/15/2023]
Abstract
Acetoin, an important and high-value added bio-based platform chemical, has been widely applied in fields of foods, cosmetics, chemical synthesis, and agriculture. Lactate is a significant intermediate short-chain carboxylate in the anaerobic breakdown of carbohydrates that comprise ~ 18% and ~ 70% in municipal wastewaters and some food processing wastewaters, respectively. In this work, a series of engineered Escherichia coli strains were constructed for efficient production of acetoin from cheaper and abundant lactate through heterogenous co-expression of fusion protein (α-acetolactate synthetase and α-acetolactate decarboxylase), lactate dehydrogenase and NADH oxidase, and blocking acetate synthesis pathways. After optimization of whole-cell bioconversion conditions, the engineered strain BL-11 produced 251.97 mM (22.20 g/L) acetoin with a yield of 0.434 mol/mol in shake flasks. Moreover, a titer of 648.97mM (57.18 g/L) acetoin was obtained in 30 h with a yield of 0.484 mol/mol lactic acid in a 1-L bioreactor. To the best of our knowledge, this is the first report on the production of acetoin from renewable lactate through whole-cell bioconversion with both high titer and yield, which demonstrates the economy and efficiency of acetoin production from lactate. Key Points • The lactate dehydrogenases from different organisms were expressed, purified, and assayed. • It is the first time that acetoin was produced from lactate by whole-cell biocatalysis. • The highest titer of 57.18 g/L acetoin was obtained with high theoretical yield in a 1-L bioreactor.
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Affiliation(s)
- Zhenzhen Cui
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (MOE), School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
| | - Meiyu Zheng
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (MOE), School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
| | - Mengnan Ding
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (MOE), School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
| | - Wei Dai
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (MOE), School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
| | - Zhiwen Wang
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (MOE), School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
| | - Tao Chen
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China.
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (MOE), School of Chemical Engineering and Technology, Tianjin University, Tianjin, China.
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Martínez-Mendoza LJ, García-Depraect O, Muñoz R. Unlocking the high-rate continuous performance of fermentative hydrogen bioproduction from fruit and vegetable residues by modulating hydraulic retention time. BIORESOURCE TECHNOLOGY 2023; 373:128716. [PMID: 36764366 DOI: 10.1016/j.biortech.2023.128716] [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: 12/27/2022] [Revised: 02/03/2023] [Accepted: 02/05/2023] [Indexed: 06/18/2023]
Abstract
Harnessing fruit-vegetable waste (FVW) as a resource to produce hydrogen via dark fermentation (DF) embraces the circular economy concept. However, there is still a need to upgrade continuous FVW-DF bioprocessing to enhance hydrogen production rates (HPR). This study aims to investigate the influence of the hydraulic retention time (HRT) on the DF of FVW by mixed culture. A stirred tank reactor under continuous mesophilic conditions was operated for 47 days with HRT stepwise reductions from 24 to 6 h, leading to organic loading rates between 47 and 188 g volatile solids (VS)/L-d. The optimum HRT of 9 h resulted in an unprecedented HPR from FVW of 11.8 NL/L-d, with a hydrogen yield of 95.6 NmL/g VS fed. Based on an overarching inspection of hydrogen production in conjunction with organic acids and carbohydrates analyses, it was hypothesized that the high FVW-to-biohydrogen conversion rate achieved was powered by lactate metabolism.
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Affiliation(s)
| | - Octavio García-Depraect
- Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina s/n., 47011 Valladolid, Spain
| | - Raúl Muñoz
- Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina s/n., 47011 Valladolid, Spain.
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Martínez-Mendoza LJ, Lebrero R, Muñoz R, García-Depraect O. Influence of key operational parameters on biohydrogen production from fruit and vegetable waste via lactate-driven dark fermentation. BIORESOURCE TECHNOLOGY 2022; 364:128070. [PMID: 36202282 DOI: 10.1016/j.biortech.2022.128070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 09/28/2022] [Accepted: 09/30/2022] [Indexed: 06/16/2023]
Abstract
This study aims at investigating the influence of operational parameters on biohydrogen production from fruit-vegetable waste (FVW) via lactate-driven dark fermentation. Mesophilic batch fermentations were conducted at different pH (5.5, 6.0, 6.5, 7.0, and non-controlled), total solids (TS) contents (5, 7, and 9%) and initial cell biomass concentrations (18, 180, and 1800 mg VSS/L). Higher hydrogen yields and rates were attained with more neutral pH values and low TS concentrations, whereas higher biomass densities enabled higher production rates and avoided wide variations in hydrogen production. A marked lactate accumulation (still at neutral pH) in the fermentation broth was closely associated with hydrogen inhibition. In contrast, enhanced hydrogen productions matched with much lower lactate accumulations (even it was negligible in some fermentations) along with the acetate and butyrate co-production but not with carbohydrates removal. At pH 7, 5% TS, and 1800 mg VSS/L, 49.5 NmL-H2/g VSfed and 976.4 NmL-H2/L-h were attained.
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Affiliation(s)
- Leonardo J Martínez-Mendoza
- Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina s/n., Valladolid 47011, Spain; Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n., Valladolid 47011, Spain
| | - Raquel Lebrero
- Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina s/n., Valladolid 47011, Spain; Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n., Valladolid 47011, Spain
| | - Raúl Muñoz
- Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina s/n., Valladolid 47011, Spain; Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n., Valladolid 47011, Spain
| | - Octavio García-Depraect
- Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina s/n., Valladolid 47011, Spain; Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n., Valladolid 47011, Spain.
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Brodowski F, Łężyk M, Gutowska N, Oleskowicz-Popiel P. Effect of external acetate on lactate-based carboxylate platform: Shifted lactate overloading limit and hydrogen co-production. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 802:149885. [PMID: 34474295 DOI: 10.1016/j.scitotenv.2021.149885] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 08/05/2021] [Accepted: 08/20/2021] [Indexed: 06/13/2023]
Abstract
Chain elongation is an anaerobic biotechnological process that converts short chain carboxylates and an electron donor (e.g. ethanol, lactate) into more valuable medium chain carboxylates. Caproate production in lactate-based chain elongation is gaining popularity, however, the relation between lactate (electron donor) and acetate (electron acceptor) has not yet been fully elucidated. Herein, for the first time, the effect of an external acetate on the lactate-based chain elongation in a continuously-fed bioreactor was tested to verify how the external acetate would affect the product spectrum, gas production, as well as stability and efficiency of carboxylates production. Periodic fluctuations in caproate production were observed in bioreactor continuously fed with lactate as a sole carbon source due to the lack of an electron acceptor (acetate) and low chain elongation performance. The recovery of stable caproate production (68.9 ± 2.2 mmol C/L/d), total lactate consumption, and high hydrogen co-production (748 ± 76 mLH2/d) was observed as an effect of the addition of an external acetate. The lactate conversion with the external acetate in the second bioreactor ensured stable and dominant caproate production from the beginning of the process. Moreover, despite the continuous lactate overloading in the process with external acetate, stable caproate production was achieved (71.7 ± 2.4 mmol C/L/d) and previously unobserved hydrogen production occurred (213 ± 30 mLH2/d). Thus, external electron acceptor addition (i.e. acetate) was proposed as an effective method for stable lactate-based caproate production. Microbiological analysis showed the dominance of microbes closely related to Ruminococcaceae bacterium CPB6 and Acinetobacter throughout the process. Co-occurrence networks based on taxon abundances and process parameters revealed microbial sub-networks responding to lactate concentrations.
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Affiliation(s)
- Filip Brodowski
- Water Supply and Bioeconomy Division, Faculty of Environmental Engineering and Energy, Poznan University of Technology, Berdychowo 4, 60-965 Poznan, Poland
| | - Mateusz Łężyk
- Water Supply and Bioeconomy Division, Faculty of Environmental Engineering and Energy, Poznan University of Technology, Berdychowo 4, 60-965 Poznan, Poland
| | - Natalia Gutowska
- Water Supply and Bioeconomy Division, Faculty of Environmental Engineering and Energy, Poznan University of Technology, Berdychowo 4, 60-965 Poznan, Poland
| | - Piotr Oleskowicz-Popiel
- Water Supply and Bioeconomy Division, Faculty of Environmental Engineering and Energy, Poznan University of Technology, Berdychowo 4, 60-965 Poznan, Poland.
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Continuous hydrogen production and microbial community profile in the dark fermentation of tequila vinasse: Response to increasing loading rates and immobilization of biomass. Biochem Eng J 2021. [DOI: 10.1016/j.bej.2021.108049] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Detman A, Laubitz D, Chojnacka A, Kiela PR, Salamon A, Barberán A, Chen Y, Yang F, Błaszczyk MK, Sikora A. Dynamics of dark fermentation microbial communities in the light of lactate and butyrate production. MICROBIOME 2021; 9:158. [PMID: 34261525 PMCID: PMC8281708 DOI: 10.1186/s40168-021-01105-x] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 05/28/2021] [Indexed: 05/08/2023]
Abstract
BACKGROUND This study focuses on the processes occurring during the acidogenic step of anaerobic digestion, especially resulting from nutritional interactions between dark fermentation (DF) bacteria and lactic acid bacteria (LAB). Previously, we have confirmed that DF microbial communities (MCs) that fed on molasses are able to convert lactate and acetate to butyrate. The aims of the study were to recognize the biodiversity of DF-MCs able and unable to convert lactate and acetate to butyrate and to define the conditions for the transformation. RESULTS MCs sampled from a DF bioreactor were grown anaerobically in mesophilic conditions on different media containing molasses or sucrose and/or lactate and acetate in five independent static batch experiments. The taxonomic composition (based on 16S_rRNA profiling) of each experimental MC was analysed in reference to its metabolites and pH of the digestive liquids. In the samples where the fermented media contained carbohydrates, the two main tendencies were observed: (i) a low pH (pH ≤ 4), lactate and ethanol as the main fermentation products, MCs dominated with Lactobacillus, Bifidobacterium, Leuconostoc and Fructobacillus was characterized by low biodiversity; (ii) pH in the range 5.0-6.0, butyrate dominated among the fermentation products, the MCs composed mainly of Clostridium (especially Clostridium_sensu_stricto_12), Lactobacillus, Bifidobacterium and Prevotella. The biodiversity increased with the ability to convert acetate and lactate to butyrate. The MC processing exclusively lactate and acetate showed the highest biodiversity and was dominated by Clostridium (especially Clostridium_sensu_stricto_12). LAB were reduced; other genera such as Terrisporobacter, Lachnoclostridium, Paraclostridium or Sutterella were found. Butyrate was the main metabolite and pH was 7. Shotgun metagenomic analysis of the selected butyrate-producing MCs independently on the substrate revealed C.tyrobutyricum as the dominant Clostridium species. Functional analysis confirmed the presence of genes encoding key enzymes of the fermentation routes. CONCLUSIONS Batch tests revealed the dynamics of metabolic activity and composition of DF-MCs dependent on fermentation conditions. The balance between LAB and the butyrate producers and the pH values were shown to be the most relevant for the process of lactate and acetate conversion to butyrate. To close the knowledge gaps is to find signalling factors responsible for the metabolic shift of the DF-MCs towards lactate fermentation. Video Abstract.
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Affiliation(s)
- Anna Detman
- Institute of Biochemistry and Biophysics – Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
| | - Daniel Laubitz
- Department of Pediatrics at Steel Children’s Research Center College of Medicine, University of Arizona, 1501 N. Campbell Avenue, Room 3301, PO Box 245073, Tucson, Arizona 85724-5073 USA
| | - Aleksandra Chojnacka
- Institute of Biochemistry and Biophysics – Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
- Faculty of Agriculture and Biology, Warsaw University of Life Sciences, Nowoursynowska 159, 02-776 Warsaw, Poland
| | - Pawel R. Kiela
- Department of Pediatrics at Steel Children’s Research Center College of Medicine, University of Arizona, 1501 N. Campbell Avenue, Room 3301, PO Box 245073, Tucson, Arizona 85724-5073 USA
| | - Agnieszka Salamon
- Institute of Agricultural and Food Biotechnology, Rakowiecka 36, 02-532 Warsaw, Poland
| | - Albert Barberán
- Department of Environmental Science, University of Arizona, 1177 E. 4th Street, P.O. Box 210038, Tucson, Arizona 85721-0038 USA
| | - Yongjian Chen
- Department of Environmental Science, University of Arizona, 1177 E. 4th Street, P.O. Box 210038, Tucson, Arizona 85721-0038 USA
| | - Fei Yang
- Department of Environmental Science, University of Arizona, 1177 E. 4th Street, P.O. Box 210038, Tucson, Arizona 85721-0038 USA
| | - Mieczysław K. Błaszczyk
- Faculty of Agriculture and Biology, Warsaw University of Life Sciences, Nowoursynowska 159, 02-776 Warsaw, Poland
| | - Anna Sikora
- Institute of Biochemistry and Biophysics – Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
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Abstract
The constant increase in the amount of food waste accumulating in landfills and discharged into the water reservoirs causes environment pollution and threatens human health. Solid and liquid food wastes include fruit, vegetable, and meat residues, alcohol bard, and sewage from various food enterprises. These products contain high concentrations of biodegradable organic compounds and represent an inexpensive and renewable substrate for the hydrogen fermentation. The goal of the work was to study the efficiency of hydrogen obtaining and decomposition of solid and liquid food waste via fermentation by granular microbial preparation (GMP). The application of GMP improved the efficiency of the dark fermentation of food waste. Hydrogen yields reached 102 L/kg of solid waste and 2.3 L/L of liquid waste. The fermentation resulted in the 91-fold reduction in the weight of the solid waste, while the concentration of organics in the liquid waste decreased 3-fold. Our results demonstrated the potential of granular microbial preparations in the production of hydrogen via dark fermentation. Further development of this technology may help to clean up the environment and reduce the reliance on fossil fuels by generating green hydrogen via recycling of household and industrial organic wastes.
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12
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García-Depraect O, Castro-Muñoz R, Muñoz R, Rene ER, León-Becerril E, Valdez-Vazquez I, Kumar G, Reyes-Alvarado LC, Martínez-Mendoza LJ, Carrillo-Reyes J, Buitrón G. A review on the factors influencing biohydrogen production from lactate: The key to unlocking enhanced dark fermentative processes. BIORESOURCE TECHNOLOGY 2021; 324:124595. [PMID: 33453519 DOI: 10.1016/j.biortech.2020.124595] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 12/16/2020] [Accepted: 12/18/2020] [Indexed: 05/15/2023]
Abstract
Dark fermentation (DF) is one of the most promising biological methods to produce bio-hydrogen and other value added bio-products from carbohydrate-rich wastes and wastewater. However, process instability and low hydrogen production yields and rates have been highlighted as the major bottlenecks preventing further development. Numerous studies have associated such concerns with the inhibitory activity of lactate-producing bacteria (LAB) against hydrogen producers. However, an increasing number of studies have also shown lactate-based metabolic pathways as the prevailing platform for hydrogen production. This opens a vast potential to develop new strategies to deal with the "Achilles heel" of DF - LAB overgrowth - while untapping high-performance DF. This review discusses the key factors influencing the lactate-driven hydrogen production, paying particular attention to substrate composition, the operating conditions, as well as the microbiota involved in the process and its potential functionality and related biochemical routes. The current limitations and future perspectives in the field are also presented.
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Affiliation(s)
- Octavio García-Depraect
- Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina, s/n, 47011 Valladolid, Spain.
| | - Roberto Castro-Muñoz
- Tecnologico de Monterrey, Campus Toluca, Avenida Eduardo Monroy Cárdenas 2000 San Antonio Buenavista, 50110 Toluca de Lerdo, Mexico; Gdansk University of Technology, Faculty of Chemistry, Department of Process Engineering and Chemical Technology, 11/12 Narutowicza St., 80-233 Gdansk, Poland
| | - Raúl Muñoz
- Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina, s/n, 47011 Valladolid, Spain
| | - Eldon R Rene
- Department of Water Supply, Sanitation and Environmental Engineering, IHE Delft Institute for Water Education, P. O. Box 3015, 2601 DA Delft, the Netherlands
| | - Elizabeth León-Becerril
- Department of Environmental Technology, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C., Av. Normalistas 800, Colinas de la Normal, 44270 Guadalajara, Jalisco, Mexico
| | - Idania Valdez-Vazquez
- Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, 76230 Querétaro, Mexico
| | - Gopalakrishnan Kumar
- Institute of Chemistry, Bioscience and Environmental Engineering, Faculty of Science and Technology, University of Stavanger, Box 8600 Forus, Stavanger 4036, Norway
| | - Luis C Reyes-Alvarado
- Unidad de Energía Renovable, Centro de Investigación Científica de Yucatán, A.C., Parque Científico de Yucatán, A.C., Carretera Sierra Papacal - Chuburná Puerto, km 5., 97302 Mérida, Yucatán, Mexico
| | - Leonardo J Martínez-Mendoza
- Department of Environmental Technology, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C., Av. Normalistas 800, Colinas de la Normal, 44270 Guadalajara, Jalisco, Mexico
| | - Julián Carrillo-Reyes
- Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, 76230 Querétaro, Mexico
| | - Germán Buitrón
- Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, 76230 Querétaro, Mexico
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Detman A, Laubitz D, Chojnacka A, Wiktorowska-Sowa E, Piotrowski J, Salamon A, Kaźmierczak W, Błaszczyk MK, Barberan A, Chen Y, Łupikasza E, Yang F, Sikora A. Dynamics and Complexity of Dark Fermentation Microbial Communities Producing Hydrogen From Sugar Beet Molasses in Continuously Operating Packed Bed Reactors. Front Microbiol 2021; 11:612344. [PMID: 33488554 PMCID: PMC7819888 DOI: 10.3389/fmicb.2020.612344] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 11/30/2020] [Indexed: 12/15/2022] Open
Abstract
This study describes the dynamics and complexity of microbial communities producing hydrogen-rich fermentation gas from sugar-beet molasses in five packed-bed reactors (PBRs). The bioreactors constitute a part of a system producing hydrogen from the by-products of the sugar-beet industry that has been operating continuously in one of the Polish sugar factories. PBRs with different working volumes, packing materials, construction and inocula were tested. This study focused on analysis (based on 16S rRNA profiling and shotgun metagenomics sequencing) of the microbial communities selected in the PBRs under the conditions of high (>100 cm3/g COD of molasses) and low (<50 cm3/g COD of molasses) efficiencies of hydrogen production. The stability and efficiency of the hydrogen production are determined by the composition of dark fermentation microbial communities. The most striking difference between the tested samples is the ratio of hydrogen producers to lactic acid bacteria. The highest efficiency of hydrogen production (130-160 cm3/g COD of molasses) was achieved at the ratios of HPB to LAB ≈ 4:2.5 or 2.5:1 as determined by 16S rRNA sequencing or shotgun metagenomics sequencing, respectively. The most abundant Clostridium species were C. pasteurianum and C. tyrobutyricum. A multiple predominance of LAB over HPB (3:1-4:1) or clostridia over LAB (5:1-60:1) results in decreased hydrogen production. Inhibition of hydrogen production was illustrated by overproduction of short chain fatty acids and ethanol. Furthermore, concentration of ethanol might be a relevant marker or factor promoting a metabolic shift in the DF bioreactors processing carbohydrates from hydrogen-yielding toward lactic acid fermentation or solventogenic pathways. The novelty of this study is identifying a community balance between hydrogen producers and lactic acid bacteria for stable hydrogen producing systems. The balance stems from long-term selection of hydrogen-producing microbial community, operating conditions such as bioreactor construction, packing material, hydraulic retention time and substrate concentration. This finding is confirmed by additional analysis of the proportions between HPB and LAB in dark fermentation bioreactors from other studies. The results contribute to the advance of knowledge in the area of relationships and nutritional interactions especially the cross-feeding of lactate between bacteria in dark fermentation microbial communities.
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Affiliation(s)
- Anna Detman
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
| | - Daniel Laubitz
- Department of Pediatrics, University of Arizona, Tucson, AZ, United States
| | - Aleksandra Chojnacka
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
- Department of Biochemistry and Microbiology, Institute of Biology, Warsaw University of Life Sciences, Warsaw, Poland
| | - Ewa Wiktorowska-Sowa
- Krajowa Spółka Cukrowa S.A. Production Facility Dobrzelin Sugar Factory, Dobrzelin, Poland
| | - Jan Piotrowski
- Krajowa Spółka Cukrowa S.A. Production Facility Dobrzelin Sugar Factory, Dobrzelin, Poland
| | | | - Wiktor Kaźmierczak
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
| | - Mieczysław K. Błaszczyk
- Department of Biochemistry and Microbiology, Institute of Biology, Warsaw University of Life Sciences, Warsaw, Poland
| | - Albert Barberan
- Department of Environmental Science, University of Arizona, Tucson, AZ, United States
| | - Yongjian Chen
- Department of Environmental Science, University of Arizona, Tucson, AZ, United States
| | - Ewa Łupikasza
- Faculty of Earth Sciences, University of Silesia in Katowice, Sosnowiec, Poland
| | - Fei Yang
- Department of Environmental Science, University of Arizona, Tucson, AZ, United States
| | - Anna Sikora
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
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14
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Mugnai G, Borruso L, Mimmo T, Cesco S, Luongo V, Frunzo L, Fabbricino M, Pirozzi F, Cappitelli F, Villa F. Dynamics of bacterial communities and substrate conversion during olive-mill waste dark fermentation: Prediction of the metabolic routes for hydrogen production. BIORESOURCE TECHNOLOGY 2021; 319:124157. [PMID: 32987280 DOI: 10.1016/j.biortech.2020.124157] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 09/16/2020] [Accepted: 09/17/2020] [Indexed: 06/11/2023]
Abstract
The aim of this work was to study the biological catalysts and possible substrate conversion routes in mesophilic dark fermentation reactors aimed at producing H2 from olive mill wastewater. Bacillus and Clostridium were the most abundant phylotypes during the rapid stage of H2 production. Chemical analyses combined with predictive functional profiling of the bacterial communities indicated that the lactate fermentation was the main H2-producing route. In fact, during the fermentation process, lactate and acetate were consumed, while H2 and butyrate were being produced. The fermentation process was rich in genes that encode enzymes for lactate generation from pyruvate. Lactate conversion to butyrate through the generation of pyruvate produced H2 through the recycling of electron carriers via the pyruvate ferredoxin oxydoreductase pathway. Overall, these findings showed the synergy among lactate-, acetate- and H2-producing bacteria, which complex interactions determine the H2 production routes in the bioreactors.
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Affiliation(s)
- Gianmarco Mugnai
- Department of Food, Environmental and Nutritional Sciences, University of Milan, via Celoria 2, 20133 Milan, Italy
| | - Luigimaria Borruso
- Faculty of Science and Technology, Free University of Bolzano, Piazza Università 5, 39100 Bolzano, Italy
| | - Tanja Mimmo
- Faculty of Science and Technology, Free University of Bolzano, Piazza Università 5, 39100 Bolzano, Italy
| | - Stefano Cesco
- Faculty of Science and Technology, Free University of Bolzano, Piazza Università 5, 39100 Bolzano, Italy
| | - Vincenzo Luongo
- Department of Mathematics and Applications "Renato Caccioppoli", University of Naples "Federico II", via Cintia, Monte S. Angelo, 80126 Naples, Italy
| | - Luigi Frunzo
- Department of Mathematics and Applications "Renato Caccioppoli", University of Naples "Federico II", via Cintia, Monte S. Angelo, 80126 Naples, Italy
| | - Massimiliano Fabbricino
- Department of Civil, Architectural and Environmental Engineering, University of Naples "Federico II", via Claudio 21, 80125 Naples, Italy
| | - Francesco Pirozzi
- Department of Civil, Architectural and Environmental Engineering, University of Naples "Federico II", via Claudio 21, 80125 Naples, Italy
| | - Francesca Cappitelli
- Department of Food, Environmental and Nutritional Sciences, University of Milan, via Celoria 2, 20133 Milan, Italy
| | - Federica Villa
- Department of Food, Environmental and Nutritional Sciences, University of Milan, via Celoria 2, 20133 Milan, Italy.
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15
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A Review of Biohydrogen Productions from Lignocellulosic Precursor via Dark Fermentation: Perspective on Hydrolysate Composition and Electron-Equivalent Balance. ENERGIES 2020. [DOI: 10.3390/en13102451] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
This paper reviews the current technological development of bio-hydrogen (BioH2) generation, focusing on using lignocellulosic feedstock via dark fermentation (DF). Using the collected reference reports as the training data set, supervised machine learning via the constructed artificial neuron networks (ANNs) imbedded with feed backward propagation and one cross-out validation approach was deployed to establish correlations between the carbon sources (glucose and xylose) together with the inhibitors (acetate and other inhibitors, such as furfural and aromatic compounds), hydrogen yield (HY), and hydrogen evolution rate (HER) from reported works. Through the statistical analysis, the concentrations variations of glucose (F-value = 0.0027) and acetate (F-value = 0.0028) were found to be statistically significant among the investigated parameters to HY and HER. Manipulating the ratio of glucose to acetate at an optimal range (approximate in 14:1) will effectively improve the BioH2 generation (HY and HER) regardless of microbial strains inoculated. Comparative studies were also carried out on the evolutions of electron equivalent balances using lignocellulosic biomass as substrates for BioH2 production across different reported works. The larger electron sinks in the acetate is found to be appreciably related to the higher HY and HER. To maintain a relative higher level of the BioH2 production, the biosynthesis needs to be kept over 30% in batch cultivation, while the biosynthesis can be kept at a low level (2%) in the continuous operation among the investigated reports. Among available solutions for the enhancement of BioH2 production, the selection of microbial strains with higher capacity in hydrogen productions is still one of the most phenomenal approaches in enhancing BioH2 production. Other process intensifications using continuous operation compounded with synergistic chemical additions could deliver additional enhancement for BioH2 productions during dark fermentation.
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16
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Santiago SG, Trably E, Latrille E, Buitrón G, Moreno-Andrade I. The hydraulic retention time influences the abundance of Enterobacter, Clostridium and Lactobacillus during the hydrogen production from food waste. Lett Appl Microbiol 2019; 69:138-147. [PMID: 31219171 DOI: 10.1111/lam.13191] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 06/03/2019] [Accepted: 06/12/2019] [Indexed: 11/26/2022]
Abstract
The influence of hydraulic retention time (HRT) on the microbial communities was evaluated in an anaerobic sequencing batch reactor (AnSBR) using organic waste from a restaurant as the substrate. The relationship among Lactobacillus, Clostridium and Bacillus as key micro-organisms on hydrogen production from organic solid waste was studied. The effect of the HRT (8-48 h) on the hydrogen production and the microbial community was evaluated. Quantitative PCR was applied to determine the abundance of bacteria (in particular, Enterobacter, Clostridium and Lactobacillus genera). An AnSBR fermentative reactor was operated for 111 cycles, with carbohydrate and organic matter removal efficiencies of 80 ± 15·42% and 22·1 ± 4·49% respectively. The highest percentage of hydrogen in the biogas (23·2 ± 11·1 %), and the specific production rate (0·42 ± 0·16 mmol H2 gVSadded -1 d-1 ) were obtained at an HRT of 48 h. The decrease in the HRT generated an increase in the hydrogen production rate but decreasing the content of the hydrogen in the gas. HRT significantly influence the abundance of Enterobacter, Clostridium and Lactobacillus during the hydrogen production from food waste leading the hydrogen production as well as the metabolic pathways. The microbial analysis revealed a direct relationship between the HRT and the presence of fermentative bacteria (Enterobacter, Clostridium and Lactobacillus genera). Clostridium sp. predominated at an HRT of 48 h, while Enterobacter and Lactobacillus predominated at HRTs between 8 and 24 h. SIGNIFICANCE AND IMPACT OF THE STUDY: Significance and Impact of the Study: It was demonstrated that hydrogen production using food waste was influenced by the hydraulic retention time (HRT), and closely related to changes in microbial communities together with differences in metabolic patterns (e.g. volatile fatty acids, lactate, etc.). The decrease in the HRT led to the dominance of lactic acid bacteria within the microbial community whereas the increase in HRT favoured the emergence of Clostridium bacteria and the increase in acetic and butyric acids. Statistical data analysis revealed a direct relationship existing between the HRT and the microbial community composition in fermentative bacteria. This study provides new insight into the relationship between the bioprocess operation and the microbial community to understand better and control the biohydrogen production.
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Affiliation(s)
- S G Santiago
- Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Querétaro, México
| | - E Trably
- LBE, Univ Montpellier, INRA, Narbonne, France
| | - E Latrille
- LBE, Univ Montpellier, INRA, Narbonne, France
| | - G Buitrón
- Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Querétaro, México
| | - I Moreno-Andrade
- Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Querétaro, México
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17
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García-Depraect O, Valdez-Vázquez I, Rene ER, Gómez-Romero J, López-López A, León-Becerril E. Lactate- and acetate-based biohydrogen production through dark co-fermentation of tequila vinasse and nixtamalization wastewater: Metabolic and microbial community dynamics. BIORESOURCE TECHNOLOGY 2019; 282:236-244. [PMID: 30870689 DOI: 10.1016/j.biortech.2019.02.100] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 02/20/2019] [Accepted: 02/21/2019] [Indexed: 05/15/2023]
Abstract
The aim of this work was to study the metabolic and microbial community dynamics during dark co-fermentation of 80% tequila vinasse and 20% nixtamalization wastewater (w/w). Batch co-fermentations were performed in a 3-L well-mixed reactor at 35 °C and pH 5.5. In correspondence to Illumina MiSeq sequencing and reactor monitoring, changes in metabolites and microbial communities were characterized by three main stages: (i) a first stage during which lactate and acetate producers dominated and consumed the major part of fermentable carbohydrates, (ii) a second stage in which lactate and acetate were consumed by emerging hydrogen-producing bacteria (HPB) in correlation with bioH2 (100 NmL/L-h or 1200 NmL/Lreactor) and butyrate production, and (iii) a third stage during which non-HPB outcompeted HPB after bioH2 production ceased. Altogether, the results of this study suggest that cooperative interactions between lactate producers and lactate- and acetate-consuming HPB could be attributed to lactate- and acetate-based cross-feeding interactions.
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Affiliation(s)
- Octavio García-Depraect
- Department of Environmental Technology, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C Av. Normalistas 800, Colinas de la Normal, 44270 Guadalajara, Jalisco, Mexico
| | - Idania Valdez-Vázquez
- Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd Juriquilla 3001, 76230 Querétaro, Mexico
| | - Eldon R Rene
- Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water Education, P. O. Box 3015, 2601 DA Delft, The Netherlands
| | - Jacob Gómez-Romero
- Department of Environmental Technology, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C Av. Normalistas 800, Colinas de la Normal, 44270 Guadalajara, Jalisco, Mexico
| | - Alberto López-López
- Department of Environmental Technology, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C Av. Normalistas 800, Colinas de la Normal, 44270 Guadalajara, Jalisco, Mexico
| | - Elizabeth León-Becerril
- Department of Environmental Technology, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C Av. Normalistas 800, Colinas de la Normal, 44270 Guadalajara, Jalisco, Mexico.
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18
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García-Depraect O, Rene ER, Diaz-Cruces VF, León-Becerril E. Effect of process parameters on enhanced biohydrogen production from tequila vinasse via the lactate-acetate pathway. BIORESOURCE TECHNOLOGY 2019. [PMID: 30497061 DOI: 10.1016/j.fuel.2018.06.126] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
In this study, a lactate-type fermentation entailing the consumption of lactate and acetate (lactate-acetate pathway) is proposed to deal with lactic acid bacteria (LAB) inhibition during the production of biohydrogen (bioH2) from tequila vinasse. The effects of total solids content, substrate concentration, nutrient formulation and inoculum addition on bioH2 production performance were investigated. Batch experiments were performed in a 3-L completely mixed reactor at 35 °C and pH 6.5-5.8. The lactate-acetate pathway mediated consistent bioH2 production which was influenced by inoculum addition followed by substrate concentration, nutrient formulation and solids content. Maximum bioH2 production rate (225 NmL/L-h) and yield (124 NmL/g VSadded) were achieved by removing suspended solids and enhancing nutrient content, respectively. Illumina sequencing-based analysis revealed a dominance of Clostridium in the inoculum, which together with LAB and acetic acid bacteria shaped a keystone cluster for avoiding LAB inhibition while ensuring consistent bioH2 production performance.
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Affiliation(s)
- Octavio García-Depraect
- Department of Environmental Technology, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C., Av. Normalistas 800, Col. Colinas de la Normal, C.P. 44270, Guadalajara, Jalisco, Mexico
| | - Eldon R Rene
- Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water Education, P. O. Box 3015, 2601 DA Delft, the Netherlands
| | - Víctor F Diaz-Cruces
- Department of Environmental Technology, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C., Av. Normalistas 800, Col. Colinas de la Normal, C.P. 44270, Guadalajara, Jalisco, Mexico
| | - Elizabeth León-Becerril
- Department of Environmental Technology, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C., Av. Normalistas 800, Col. Colinas de la Normal, C.P. 44270, Guadalajara, Jalisco, Mexico.
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19
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García-Depraect O, Rene ER, Diaz-Cruces VF, León-Becerril E. Effect of process parameters on enhanced biohydrogen production from tequila vinasse via the lactate-acetate pathway. BIORESOURCE TECHNOLOGY 2019; 273:618-626. [PMID: 30497061 DOI: 10.1016/j.biortech.2018.11.056] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Revised: 11/13/2018] [Accepted: 11/14/2018] [Indexed: 05/15/2023]
Abstract
In this study, a lactate-type fermentation entailing the consumption of lactate and acetate (lactate-acetate pathway) is proposed to deal with lactic acid bacteria (LAB) inhibition during the production of biohydrogen (bioH2) from tequila vinasse. The effects of total solids content, substrate concentration, nutrient formulation and inoculum addition on bioH2 production performance were investigated. Batch experiments were performed in a 3-L completely mixed reactor at 35 °C and pH 6.5-5.8. The lactate-acetate pathway mediated consistent bioH2 production which was influenced by inoculum addition followed by substrate concentration, nutrient formulation and solids content. Maximum bioH2 production rate (225 NmL/L-h) and yield (124 NmL/g VSadded) were achieved by removing suspended solids and enhancing nutrient content, respectively. Illumina sequencing-based analysis revealed a dominance of Clostridium in the inoculum, which together with LAB and acetic acid bacteria shaped a keystone cluster for avoiding LAB inhibition while ensuring consistent bioH2 production performance.
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Affiliation(s)
- Octavio García-Depraect
- Department of Environmental Technology, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C., Av. Normalistas 800, Col. Colinas de la Normal, C.P. 44270, Guadalajara, Jalisco, Mexico
| | - Eldon R Rene
- Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water Education, P. O. Box 3015, 2601 DA Delft, the Netherlands
| | - Víctor F Diaz-Cruces
- Department of Environmental Technology, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C., Av. Normalistas 800, Col. Colinas de la Normal, C.P. 44270, Guadalajara, Jalisco, Mexico
| | - Elizabeth León-Becerril
- Department of Environmental Technology, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C., Av. Normalistas 800, Col. Colinas de la Normal, C.P. 44270, Guadalajara, Jalisco, Mexico.
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20
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Pagliano G, Ventorino V, Panico A, Romano I, Pirozzi F, Pepe O. Anaerobic Process for Bioenergy Recovery From Dairy Waste: Meta-Analysis and Enumeration of Microbial Community Related to Intermediates Production. Front Microbiol 2019; 9:3229. [PMID: 30687248 PMCID: PMC6334743 DOI: 10.3389/fmicb.2018.03229] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Accepted: 12/12/2018] [Indexed: 11/28/2022] Open
Abstract
Dairy wastes are widely studied for the hydrogen and methane production, otherwise the changes in microbial communities related to intermediate valuable products was not deeply investigated. Culture independent techniques are useful tools for exploring microbial communities in engineered system having new insights into their structure and function as well as potential industrial application. The deep knowledge of the microbiota involved in the anaerobic process of specific waste and by-products represents an essential step to better understand the entire process and the relation of each microbial population with biochemical intermediates and final products. Therefore, this study investigated the microbial communities involved in the laboratory-scale anaerobic digestion of a mixture of mozzarella cheese whey and buttermilk amended with 5% w/v of industrial animal manure pellets. Culture-independent methods by employing high-throughput sequencing and microbial enumerations highlighted that lactic acid bacteria, such as Lactobacillaceae and Streptococcaceae dominated the beginning of the process until about day 14 when a relevant increase in hydrogen production (more than 10 ml H2 gVS-1 from days 13 to 14) was observed. Furthermore, during incubation a gradual decrease of lactic acid bacteria was detected with a simultaneous increase of Clostridia, such as Clostridiaceae and Tissierellaceae families. Moreover, archaeal populations in the biosystem were strongly related to inoculum since the non-inoculated samples of the dairy waste mixture had a relative abundance of archaea less than 0.1%; whereas, in the inoculated samples of the same mixture several archaeal genera were identified. Among methanogenic archaea, Methanoculleus was the dominant genus during all the process especially when the methane production occurred, and its relative abundance increased up to 99% at the end of the incubation time highlighting that methane was formed from dairy wastes primarily by the hydrogenotrophic pathway in the reactors.
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Affiliation(s)
- Giorgia Pagliano
- Department of Agricultural Sciences, University of Naples Federico II, Naples, Italy
| | - Valeria Ventorino
- Department of Agricultural Sciences, University of Naples Federico II, Naples, Italy.,Task Force on Microbiome Studies, University of Naples Federico II, Naples, Italy
| | | | - Ida Romano
- Department of Agricultural Sciences, University of Naples Federico II, Naples, Italy
| | - Francesco Pirozzi
- Task Force on Microbiome Studies, University of Naples Federico II, Naples, Italy.,Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, Naples, Italy
| | - Olimpia Pepe
- Department of Agricultural Sciences, University of Naples Federico II, Naples, Italy.,Task Force on Microbiome Studies, University of Naples Federico II, Naples, Italy
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21
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Rabelo CABS, Soares LA, Sakamoto IK, Silva EL, Varesche MBA. Optimization of hydrogen and organic acids productions with autochthonous and allochthonous bacteria from sugarcane bagasse in batch reactors. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 223:952-963. [PMID: 30007891 DOI: 10.1016/j.jenvman.2018.07.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 07/03/2018] [Accepted: 07/05/2018] [Indexed: 06/08/2023]
Abstract
The individual and mutual effects of substrate concentration (from 0.8 to 9.2 g/L) and pH (from 4.6 to 7.4) on hydrogen and volatile fatty acids production from sugarcane bagasse (SCB) were investigated in batch reactors, using a response surface methodology (RSM) and central composite design (CCD). The maximum of 23.10 mmoL H2/L was obtained under optimized conditions of 7.0 g SCB/L and pH 7.2, at 37 °C through the acetic acid pathway (1.57 g/L). Butyric and succinic acids were the major volatile fatty acids (VFA) produced in the fermentation process (from 0.66 to 1.88 g/L and from 1.06 to 1.65 g/L, respectively). According to the results, the RSM and CCD were useful tools to achieve high hydrogen production rates using Clostridium, Bacillus and Enterobacter, identified by Illumina sequencing (16S RNAr) in the fermentative consortium, and Clostridium and Paenibacillus, autochthonous bacteria from SCB. Significant changes were observed in the microbial community according to the changes in the independent variables, since the genera in the central point condition (5.0 g SCB/L and pH 6.0) were Lactobacillus, Escherichia and Clostridium, and Bacteroides and Enterobacter, which were identified in the optimized condition (7.0 g SCB/L and pH 7.2).
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Affiliation(s)
| | - Laís Américo Soares
- University of São Paulo, João Dagnone Avenue, 1100, CEP 13563-120, São Carlos, SP, Brazil.
| | - Isabel Kimiko Sakamoto
- University of São Paulo, João Dagnone Avenue, 1100, CEP 13563-120, São Carlos, SP, Brazil.
| | - Edson Luiz Silva
- Federal University of São Carlos, Rod Washington Luis, Km 235, 13565-905, São Carlos, SP, Brazil.
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Noblecourt A, Christophe G, Larroche C, Fontanille P. Hydrogen production by dark fermentation from pre-fermented depackaging food wastes. BIORESOURCE TECHNOLOGY 2018; 247:864-870. [PMID: 30060424 DOI: 10.1016/j.biortech.2017.09.199] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 09/26/2017] [Accepted: 09/28/2017] [Indexed: 06/08/2023]
Abstract
In this study, a specific fraction of food waste, i.e. depackaging waste, was studied as substrate for hydrogen production by dark fermentation. During storage and transport of this liquid mixture, inhibitory compounds like acids or alcohol might be produced by endogenous flora. A factorial fractional design based on the composition of the substrate was used to determine the best condition to convert this substrate into hydrogen. First results indicated that the consortium used might convert high quantity of lactate into hydrogen. A batch culture confirmed that lactate was used as the main carbon source and a global yield of 0.4molH2·mollactate-1 was obtained. This study demonstrated the ability of the consortium tested to convert different carbon sources (carbohydrates or lactate) with good efficiency. These data represented an important parameter in the prospect of using an industrial substrate whose composition is liable to vary according to the conditions of storage and transport.
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Affiliation(s)
- Alexandre Noblecourt
- Université Clermont Auvergne, Institut Pascal, TSA 60026, F-63178 Aubière cedex, France; CNRS, UMR 6602, IP, F-63178 Aubière cedex, France; Université Clermont Auvergne, LABEX IMobS3, 63178 Aubière cedex, France
| | - Gwendoline Christophe
- Université Clermont Auvergne, Institut Pascal, TSA 60026, F-63178 Aubière cedex, France; CNRS, UMR 6602, IP, F-63178 Aubière cedex, France; Université Clermont Auvergne, LABEX IMobS3, 63178 Aubière cedex, France
| | - Christian Larroche
- Université Clermont Auvergne, Institut Pascal, TSA 60026, F-63178 Aubière cedex, France; CNRS, UMR 6602, IP, F-63178 Aubière cedex, France; Université Clermont Auvergne, LABEX IMobS3, 63178 Aubière cedex, France
| | - Pierre Fontanille
- Université Clermont Auvergne, Institut Pascal, TSA 60026, F-63178 Aubière cedex, France; CNRS, UMR 6602, IP, F-63178 Aubière cedex, France; Université Clermont Auvergne, LABEX IMobS3, 63178 Aubière cedex, France.
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Cheng HH, Whang LM, Chung MC, Chan KC. Biological hydrogen and methane production from bagasse bioethanol fermentation residues using a two-stage bioprocess. BIORESOURCE TECHNOLOGY 2016; 210:49-55. [PMID: 26774443 DOI: 10.1016/j.biortech.2015.12.084] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 12/28/2015] [Accepted: 12/29/2015] [Indexed: 06/05/2023]
Abstract
This study investigated the recovery of H2 and CH4 from bagasse bioethanol fermentation residues (bagasse BEFR) using a two-stage bioprocess. In the hydrogen fermentation bioreactor (HFB), carbohydrate removal efficiency was maintained at 82-93% and the highest hydrogen yield was 8.24mL/gCOD at volumetric loading rate (VLR) of 80kgCOD/m(3)/day. The results indicated a positive correlation between hydrogen yield and butyrate-to-acetate ratio, which might be due to the mechanisms of lactate/acetate utilization for hydrogen production and acetogenesis occurring in the HFB. Remaining volatile fatty acids and alcohols in the HFB effluent were further utilized for methane production in methane fermentation bioreactor (MFB), in which the highest methane yield of 345.2mL/gCOD was attained at VLR of 2.5kgCOD/m(3)/day. Overall, the two-stage bioprocess achieved a maximum COD removal of 81% from bagasse BEFR, and converted 0.3% and 72.8% of COD in the forms of H2 and CH4, respectively.
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Affiliation(s)
- Hai-Hsuan Cheng
- Department of Environmental Engineering, National Cheng Kung University (NCKU), No. 1, University Road, Tainan 701, Taiwan
| | - Liang-Ming Whang
- Department of Environmental Engineering, National Cheng Kung University (NCKU), No. 1, University Road, Tainan 701, Taiwan; Sustainable Environment Research Laboratory (SERL), National Cheng Kung University (NCKU), No. 1, University Road, Tainan 701, Taiwan; Research Center for Energy Technology and Strategy (RCETS), National Cheng Kung University (NCKU), No. 1, University Road, Tainan 701, Taiwan.
| | - Man-Chien Chung
- Department of Environmental Engineering, National Cheng Kung University (NCKU), No. 1, University Road, Tainan 701, Taiwan
| | - Kun-Chi Chan
- Department of Environmental Engineering, National Cheng Kung University (NCKU), No. 1, University Road, Tainan 701, Taiwan
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Tao Y, Hu X, Zhu X, Jin H, Xu Z, Tang Q, Li X. Production of Butyrate from Lactate by a Newly Isolated Clostridium sp. BPY5. Appl Biochem Biotechnol 2016; 179:361-74. [DOI: 10.1007/s12010-016-1999-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 01/24/2016] [Indexed: 10/22/2022]
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Cheng HH, Whang LM, Wu SH. Enhanced bioenergy recovery from oil-extracted microalgae residues via two-step H2/CH4or H2/butanol anaerobic fermentation. Biotechnol J 2016; 11:375-83. [DOI: 10.1002/biot.201500285] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 09/14/2015] [Accepted: 12/10/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Hai-Hsuan Cheng
- Department of Environmental Engineering, National Cheng Kung University; Tainan Taiwan
| | - Liang-Ming Whang
- Department of Environmental Engineering, National Cheng Kung University; Tainan Taiwan
- Sustainable Environment Research Laboratory (SERL), National Cheng Kung University; Tainan Taiwan
- Research Center for Energy Technology and Strategy (RCETS), National Cheng Kung University; Tainan Taiwan
| | - Shu-Hsien Wu
- Department of Environmental Engineering, National Cheng Kung University; Tainan Taiwan
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Turon V, Trably E, Fayet A, Fouilland E, Steyer JP. Raw dark fermentation effluent to support heterotrophic microalgae growth: microalgae successfully outcompete bacteria for acetate. ALGAL RES 2015. [DOI: 10.1016/j.algal.2015.08.011] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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27
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Cheng HH, Whang LM, Lin CA, Liu IC, Wu CW. Metabolic flux network analysis of fermentative hydrogen production: using Clostridium tyrobutyricum as an example. BIORESOURCE TECHNOLOGY 2013; 141:233-9. [PMID: 23659760 DOI: 10.1016/j.biortech.2013.03.141] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 03/18/2013] [Accepted: 03/20/2013] [Indexed: 05/04/2023]
Abstract
This study applies metabolic flux network analysis (MFA) to evaluate the metabolic flux of fermentative hydrogen production (FHP) with the use of Clostridium tyrobutyricum fed with either glucose or lactate/acetate as substrates. The MFA results suggest that hydraulic retention time (HRT) presents significant impact on hydrogen production from glucose. At HRT between 4 and 18 h, increase of HRT increased hydrogen production but decreased lactate production, while at HRT below 4 h decrease of HRT increased hydrogen production but decreased lactate production. The flux for lactate, butyrate and acetate seemed to affect H₂ production, due presumably to their impacts on the balance of NADH, ferredoxin and ATP. It is suggested that the MFA can be a useful tool to provide valuable information for optimization and design of the fermentative hydrogen production process.
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Affiliation(s)
- Hai-Hsuan Cheng
- Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701, Taiwan
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Men Y, Lee PKH, Harding KC, Alvarez-Cohen L. Characterization of four TCE-dechlorinating microbial enrichments grown with different cobalamin stress and methanogenic conditions. Appl Microbiol Biotechnol 2013; 97:6439-50. [PMID: 23640361 DOI: 10.1007/s00253-013-4896-8] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Revised: 04/03/2013] [Accepted: 04/03/2013] [Indexed: 11/27/2022]
Abstract
To investigate the important supportive microorganisms responsible for trichloroethene (TCE) bioremediation under specific environmental conditions and their relationship with Dehalococcoides (Dhc), four stable and robust enrichment cultures were generated using contaminated groundwater. Enrichments were maintained under four different conditions exploring two parameters: high and low TCE amendments (resulting in inhibited and uninhibited methanogenic activity, respectively) and with and without vitamin B₁₂ amendment. Lactate was supplied as the electron donor. All enrichments were capable of reductively dechlorinating TCE to vinyl chloride and ethene. The dechlorination rate and ethene generation were higher, and the proportion of electrons used for dechlorination increased when methanogenesis was inhibited. Biologically significant cobalamin biosynthesis was detected in the enrichments without B₁₂ amendment. Comparative genomics using a genus-wide microarray revealed a Dhc genome similar to that of strain 195 in all enrichments, a strain that lacks the major upstream corrin ring biosynthesis pathway. Seven other bacterial operational taxonomic units (OTUs) were detected using clone libraries. OTUs closest to Pelosinus, Dendrosporobacter, and Sporotalea (PDS) were most dominant. The Clostridium-like OTU was most affected by B₁₂ amendment and active methanogenesis. Principal component analysis revealed that active methanogenesis, rather than vitamin B₁₂ limitation, exerted a greater effect on the community structures even though methanogens did not seem to play an essential role in providing corrinoids to Dhc. In contrast, acetogenic bacteria that were abundant in the enrichments, such as PDS and Clostridium sp., may be potential corrinoid providers for Dhc.
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Affiliation(s)
- Yujie Men
- Department of Civil and Environmental Engineering, University of California, 207 O'Brien Hall, Berkeley, CA 94720-1710, USA
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