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Ramalho TP, Siol A, Kerzenmacher S, Verseux C, Pillot G. Anaerobic digestion of cyanobacterial biomass for plant fertilizer production on Mars. BIORESOURCE TECHNOLOGY 2025; 427:132383. [PMID: 40089033 DOI: 10.1016/j.biortech.2025.132383] [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: 10/23/2024] [Revised: 02/19/2025] [Accepted: 03/08/2025] [Indexed: 03/17/2025]
Abstract
BACKGROUND A sustained presence on Mars requires the production of food on site, but farming is limited by the local availability of suitable nutrients. Cyanobacteria can feed on Martian resources, and we hypothesized that the nutrients they mobilize could be extracted through anaerobic digestion and used as crop fertilizer. METHODS We therefore tested the abilities of three microbial communities to digest the biomass of Anabaena sp. in minimal medium, 200 g L-1 Mars regolith simulant (MGS-1), and water. RESULTS All communities produced ammonium and removed organic carbon in all media, especially in minimal medium and 200 g L-1 MGS-1. However, MGS-1 also adsorbed organics and reduced the phosphate and ammonium recovery efficiency. A taxonomic analysis revealed a syntrophic fermentative community and hydrogenotrophic methanogens in minimal medium, but methanogens were outcompeted in MGS-1 by sulfate-reducing bacteria. IMPACT Overall, this study suggests the viability of a bioprocess which could support crop production from Martian resources.
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Affiliation(s)
- Tiago P Ramalho
- Center for Environmental Research and Sustainable Technology (UFT), University of Bremen, Bremen, Germany; Center of Applied Space Technology and Microgravity (ZARM), University of Bremen, Bremen, Germany
| | - Antje Siol
- Center for Environmental Research and Sustainable Technology (UFT), University of Bremen, Bremen, Germany
| | - Sven Kerzenmacher
- Center for Environmental Research and Sustainable Technology (UFT), University of Bremen, Bremen, Germany
| | - Cyprien Verseux
- Center for Environmental Research and Sustainable Technology (UFT), University of Bremen, Bremen, Germany; Center of Applied Space Technology and Microgravity (ZARM), University of Bremen, Bremen, Germany
| | - Guillaume Pillot
- Center for Environmental Research and Sustainable Technology (UFT), University of Bremen, Bremen, Germany.
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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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Villanueva-Galindo E, Pérez-Rangel M, Moreno-Andrade I. Evaluation of individual and combined effect of lactic acid-consuming bacteria on mesophilic hydrogen production from lactic acid effluent from food waste treatment. BIORESOURCE TECHNOLOGY 2024; 408:131224. [PMID: 39111400 DOI: 10.1016/j.biortech.2024.131224] [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: 05/17/2024] [Revised: 07/12/2024] [Accepted: 08/04/2024] [Indexed: 08/10/2024]
Abstract
Lactic acid has been applied as a precursor for hydrogen (H2) production from substrates rich in lactic acid bacteria (LAB), focusing on microbial interactions between producing and consuming LAB tested with model substrates. Therefore, this study evaluated the effect of single and combined lactic acid-consuming bacteria on mesophilic H2 production in batch tests from lactic acid from fermented food waste (FW). Megasphaera elsdenii, Clostridium beijerinckii, and Clostridium butyricum were inoculated at different ratios (v/v). Additionally, thermal pretreated sludge (TPS) was added to the strain mixtures. The highest production was obtained with M. elsdenii, C. beijerinckii, and C. butyricum (17:66:17 ratio), obtaining 1629.0 mL/Lreactor. The optimal mixture (68:32:0 of M. elsdenii and C. beijerinckii) enriched with TPS reached 1739.3 ± 98.6 mL H2/Lreactor, consuming 98 % of lactic acid added. M. elsdenii and Clostridium strains enhance H2 production from lactic acid as they persist in a microbial community initially dominated by LAB.
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Affiliation(s)
- Edith Villanueva-Galindo
- Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro 76230, Mexico
| | - Marisol Pérez-Rangel
- Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro 76230, Mexico
| | - Iván Moreno-Andrade
- Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro 76230, Mexico.
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Ghannoum MA, Elshaer M, Al-Shakhshir H, Retuerto M, McCormick TS. A Probiotic Amylase Blend Positively Impacts Gut Microbiota Modulation in a Randomized, Placebo-Controlled, Double-Blind Study. Life (Basel) 2024; 14:824. [PMID: 39063578 PMCID: PMC11277872 DOI: 10.3390/life14070824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2024] [Revised: 06/21/2024] [Accepted: 06/26/2024] [Indexed: 07/28/2024] Open
Abstract
The present study was performed to determine if ingesting a blend of probiotics plus amylase would alter the abundance and diversity of gut microbiota in subjects consuming the blend over a 6-week period. 16S and ITS ribosomal RNA (rRNA) sequencing was performed on fecal samples provided by subjects who participated in a clinical study where they consumed either a probiotic amylase blend (Bifidobacterium breve 19bx, Lactobacillus acidophilus 16axg, Lacticaseibacillus rhamnosus 18fx, and Saccharomyces boulardii 16mxg, alpha amylase (500 SKB (Alpha-amylase-Dextrinizing Units)) or a placebo consisting of rice oligodextrin. The abundance and diversity of both bacterial and fungal organisms was assessed at baseline and following 6 weeks of probiotic amylase blend or placebo consumption. In the subjects consuming the probiotic blend, the abundance of Saccharomyces cerevisiae increased 200-fold, and its prevalence increased (~20% to ~60%) (p ≤ 0.05), whereas the potential pathogens Bacillus thuringiensis and Macrococcus caseolyticus decreased more than 150- and 175-fold, respectively, after probiotic-amylase blend consumption. We also evaluated the correlation between change in microbiota and clinical features reported following probiotic amylase consumption. Nine (9) species (seven bacterial and two fungal) were significantly (negatively or positively) associated with the change in 32 clinical features that were originally evaluated in the clinical study. Oral supplementation with the probiotic-amylase blend caused a marked increase in abundance of the beneficial yeast S. cerevisiae and concomitant modulation of gut-dwelling commensal bacterial organisms, providing the proof of concept that a beneficial commensal organism can re-align the gut microbiota.
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Affiliation(s)
- Mahmoud A. Ghannoum
- Department of Dermatology, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
- Department of Dermatology, University Hospitals Cleveland Medical Center, Cleveland, OH 44106, USA
| | - Mohammed Elshaer
- Department of Dermatology, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
- Department of Dermatology, University Hospitals Cleveland Medical Center, Cleveland, OH 44106, USA
- Department of Clinical Pathology, Faculty of Medicine, Mansoura University, Mansoura 35516, Egypt
| | - Hilmi Al-Shakhshir
- Department of Dermatology, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Mauricio Retuerto
- Department of Dermatology, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Thomas S. McCormick
- Department of Dermatology, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
- Department of Dermatology, University Hospitals Cleveland Medical Center, Cleveland, OH 44106, USA
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Trevisan AP, Lied EB, Fuess LT, Zaiat M, de Souza WG, Gomes SD, Gomes BM. Improving the Continuous Multiple Tube Reactor: an Innovative Bioreactor Configuration with Great Potential for Dark Fermentation Processes. Appl Biochem Biotechnol 2024; 196:457-477. [PMID: 37140783 DOI: 10.1007/s12010-023-04553-3] [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] [Accepted: 04/18/2023] [Indexed: 05/05/2023]
Abstract
The continuous multiple tube reactor (CMTR) has been developed as a promising technology to maximize biohydrogen production (BHP) by dark fermentation (DF) by preventing excess biomass accumulation, leading to suboptimum values of specific organic loading rates (SOLR). However, previous experiences failed to achieve stable and continuous BHP in this reactor, as the low biomass retention capacity in the tube region limited controlling the SOLR. This study goes beyond the evaluation of the CMTR for DF by inserting grooves in the inner wall of the tubes to ensure better cell attachment. The CMTR was monitored in 4 assays at 25ºC using sucrose-based synthetic effluent. The hydraulic retention time (HRT) was fixed at 2 h, while the COD varied between 2-8 g L-1 to obtain organic loading rates in the 24 - 96 g COD L-1 d-1. Long-term (90 d) BHP was successfully attained in all conditions due to the improved biomass retention capacity. Optimal values for the SOLR (4.9 g COD g-1 VSS d-1) were observed when applying up to 48 g COD L-1 d-1, in which BHP was maximized. These patterns indicate a favorable balance between biomass retention and washout was naturally achieved. The CMTR looks promising for continuous BHP and is exempt from additional biomass discharge strategies.
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Affiliation(s)
- Ana Paula Trevisan
- Post-Graduation in Agricultural Engineering, Western Parana State University, 2069, Universitária St., Jardim Universitário, Cascavel, PR, 5819-110, Brazil
| | - Eduardo Borges Lied
- Department of Biological and Environmental Sciences, Federal Technological University of Paraná, Av. Brasil, 4232, Parque Independência, Medianeira, PR, 85884-000, Brazil.
| | - Lucas Tadeu Fuess
- Chemical Engineering Department, Polytechnic School, University of São Paulo (DEQ/EP/USP), Av. Prof. Lineu Prestes 580, Bloco 18 - Conjunto das Químicas, São Paulo, SP, 05508-000, Brazil
| | - Marcelo Zaiat
- Biological Processes Laboratory (LPB), São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, SP, 13563-120, Brazil
| | - Willyan Goergen de Souza
- Post-Graduation in Agricultural Engineering, Western Parana State University, 2069, Universitária St., Jardim Universitário, Cascavel, PR, 5819-110, Brazil
| | - Simone Damasceno Gomes
- Post-Graduation in Agricultural Engineering, Western Parana State University, 2069, Universitária St., Jardim Universitário, Cascavel, PR, 5819-110, Brazil
| | - Benedito Martins Gomes
- Post-Graduation in Agricultural Engineering, Western Parana State University, 2069, Universitária St., Jardim Universitário, Cascavel, PR, 5819-110, Brazil
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Lacroux J, Llamas M, Dauptain K, Avila R, Steyer JP, van Lis R, Trably E. Dark fermentation and microalgae cultivation coupled systems: Outlook and challenges. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 865:161136. [PMID: 36587699 DOI: 10.1016/j.scitotenv.2022.161136] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 11/30/2022] [Accepted: 12/19/2022] [Indexed: 06/17/2023]
Abstract
The implementation of a sustainable bio-based economy is considered a top priority today. There is no doubt about the necessity to produce renewable bioenergy and bio-sourced chemicals to replace fossil-derived compounds. Under this scenario, strong efforts have been devoted to efficiently use organic waste as feedstock for biohydrogen production via dark fermentation. However, the technoeconomic viability of this process needs to be enhanced by the valorization of the residual streams generated. The use of dark fermentation effluents as low-cost carbon source for microalgae cultivation arises as an innovative approach for bioproducts generation (e.g., biodiesel, bioactive compounds, pigments) that maximizes the carbon recovery. In a biorefinery context, after value-added product extraction, the spent microalgae biomass can be further valorised as feedstock for biohydrogen production. This integrated process would play a key role in the transition towards a circular economy. This review covers recent advances in microalgal cultivation on dark fermentation effluents (DFE). BioH2 via dark fermentation processes and the involved metabolic pathways are detailed with a special focus on the main aspects affecting the effluent composition. Interesting traits of microalgae and current approaches to solve the challenges associated to the integration of dark fermentation and microalgae cultivation are also discussed.
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Affiliation(s)
- Julien Lacroux
- LBE, Univ Montpellier, INRAE, 102 avenue des Etangs, F-11100 Narbonne, France
| | - Mercedes Llamas
- LBE, Univ Montpellier, INRAE, 102 avenue des Etangs, F-11100 Narbonne, France; Instituto de la Grasa (C.S.I.C.), Campus Universidad Pablo de Olavide, Edificio 46., Ctra. de Utrera km. 1, 41013 Sevilla, Spain
| | - Kevin Dauptain
- LBE, Univ Montpellier, INRAE, 102 avenue des Etangs, F-11100 Narbonne, France
| | - Romina Avila
- Chemical, Biological and Environmental Engineering Department, Escola d'Enginyeria, Universitat Autònoma de Barcelona, Bellaterra, Barcelona E-08193, Spain
| | | | - Robert van Lis
- LBE, Univ Montpellier, INRAE, 102 avenue des Etangs, F-11100 Narbonne, France
| | - Eric Trably
- LBE, Univ Montpellier, INRAE, 102 avenue des Etangs, F-11100 Narbonne, France.
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Su R, Zhou L, Ding L, Fu B, Fu H, Shuang Y, Ye L, Hu H, Ma H, Ren H. How anaerobic sludge microbiome respond to different concentrations of nitrite, nitrate, and ammonium ions: a comparative analysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:49026-49037. [PMID: 36763271 DOI: 10.1007/s11356-023-25704-3] [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: 09/15/2022] [Accepted: 01/30/2023] [Indexed: 02/11/2023]
Abstract
High concentrations of ammonium, nitrite, and nitrate always induce inhibition in anaerobic wastewater treatment. Due to the complexity and vulnerability of the microbial community (especially methanogens) in anaerobic sludge, little is understood about its underlying microbial mechanism under such inhibition. In this study, the shifts of microbial communities in anaerobic sludge under increasing levels of nitrite, nitrate, and ammonium ions were compared. Results show that although half maximal inhibitory concentrations (methanogenesis) were different for nitrite, nitrate, and ammonium ions with EC50 values of 12, 30, and 3000 mg N/L, respectively, bacteria genera Kosmotoga and Brooklawnia dominated in all of the three high-stress inhibitory systems. Network analysis and redundancy analysis (RDA) of the microbial community showed the treatments with nitrate and nitrite ions decreased the modularity of anaerobic microorganisms. RDA showed that specific methanogenic activity was positively related to coenzyme F420 under nitrite inhibition (rp = 0.833, p < 0.05) and closely correlated with viability under nitrate inhibition. Gram-positive and nonmotile Brooklawnia genus showed a negative correlation with physiological characteristics in the ammonia treatments, suggesting its high resistance to ammonia.
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Affiliation(s)
- Runhua Su
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, 210023, China
| | - Lina Zhou
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, 210023, China
| | - Lili Ding
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, 210023, China.
| | - Bo Fu
- School of Environmental and Civil Engineering, Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, Jiangnan University, Wuxi, 214122, China
| | - Huimin Fu
- National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Chongqing, 400067, China
| | - Yanan Shuang
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, 210023, China
| | - Lin Ye
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, 210023, China
| | - Haidong Hu
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, 210023, China
| | - Haijun Ma
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, 210023, China
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, 210023, China
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Sivagurunathan P, Sahoo PC, Kumar M, Prakash Gupta R, Bhattacharyya D, Ramakumar SSV. Unrevealing the role of metal oxide nanoparticles on biohydrogen production by Lactobacillus delbrueckii. BIORESOURCE TECHNOLOGY 2023; 367:128260. [PMID: 36343775 DOI: 10.1016/j.biortech.2022.128260] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 10/27/2022] [Accepted: 10/30/2022] [Indexed: 06/16/2023]
Abstract
The positive interaction between Clostridium sp. and lactic acid-producing bacteria (Lactobacillus sp) is commonly seen in various high-rate hydrogen production systems. However, the exact role of the hydrogen production ability of Lactobacillus sp in a dark fermentation production system is rarely studied. Lactobacillus delbrueckii was herein used for the first time, to the best of the author's knowledge, to demonstrate biohydrogen production under anaerobic conditions. At first, the pH condition was optimized, followed by the addition of nanoparticles for enhanced biohydrogen production. Under optimized conditions of pH 6.5, substrate concentration 10 g/L, and 100 mg/L of NiO/Fe2O3, the maximum hydrogen yield (HY) of 1.94 mol/mol hexose was obtained, which is 18 % more than the control. The enhanced H2 production upon the addition of nanoparticles is supported via the external electron transfer (EET) mechanism, which regulates the metabolic pathway regulation with increased production of acetate and butyrate and reduced formation of lactate.
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Affiliation(s)
- Periyasamy Sivagurunathan
- Indian Oil Corporation Limited, Research & Development Centre, Sector 13, Faridabad 121007, Haryana, India
| | - Prakash C Sahoo
- Indian Oil Corporation Limited, Research & Development Centre, Sector 13, Faridabad 121007, Haryana, India
| | - Manoj Kumar
- Indian Oil Corporation Limited, Research & Development Centre, Sector 13, Faridabad 121007, Haryana, India.
| | - Ravi Prakash Gupta
- Indian Oil Corporation Limited, Research & Development Centre, Sector 13, Faridabad 121007, Haryana, India
| | - Debasis Bhattacharyya
- Indian Oil Corporation Limited, Research & Development Centre, Sector 13, Faridabad 121007, Haryana, India
| | - S S V Ramakumar
- Indian Oil Corporation Limited, Research & Development Centre, Sector 13, Faridabad 121007, Haryana, India
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New insights into microbial interactions and putative competitive mechanisms during the hydrogen production from tequila vinasses. Appl Microbiol Biotechnol 2022; 106:6861-6876. [PMID: 36071291 DOI: 10.1007/s00253-022-12143-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2021] [Revised: 06/02/2022] [Accepted: 08/24/2022] [Indexed: 11/02/2022]
Abstract
This study aimed to characterize the prokaryotic community and putative microbial interactions involved in hydrogen (H2) production during the dark fermentation (DF) process, applying principal components analysis (PCA) to correlate changes in operational, physicochemical, and biological variables. For this purpose, a continuous stirred-tank reactor-type digester fed with tequila vinasses was operated at 24, 18, and 12 h of hydraulic retention times (HRTs) to apply organic loading rates of 20, 36, and 54 g-COD L-1 d-1, corresponding to stages I, II, and III, respectively. Results indicated high population dynamics for Archaea during the DF process toward a decrease in total sequences from 6299 to 99. Concerning the Bacteria community, lactic acid bacteria (LAB) were dominant reaching a relative abundance of 57.67%, while dominant H2-producing bacteria (HPB) decreased from 25.76% to 21.06% during stage III. Putative competitive exclusion mechanisms such as competition for substrates, bacteriocins production, and micronutrient depletion carried out by Archaea and non-H2-producing bacteria (non-HPB), especially LAB, could negatively impact the dominance of HPB such as Ethanoligenens harbinense and Clostridium tyrobutyricum. As a consequence, low maximal volumetric H2 production rate (672 mL-H2 L-1 d-1) and yield (3.88 mol-H2 assimilated sugars-1) were obtained. The global scenario obtained by PCA correlations suggested that C. tyrobutyricum positively impacted H2 molar yield through butyrate fermentation using the butyryl-CoA:acetate CoA transferase pathway, while the most abundant HPB E. harbinense decreased its relative abundance at the shortest HRT toward the dominance of non-HPB. This study provides new insights into the microbial interactions and helps to better understand the DF performance for H2 production using tequila vinasses as substrate. KEY POINTS: • E. harbinense and C. tyrobutyricum were responsible for H2 production. • Clostridiales used acetate and butyrate fermentations for H2 production. • LAB won the competition for sugars against Clostridiales during DF. • Putative bacteriocins production and micronutrients depletion could favor LAB.
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Pérez-Rangel M, Valdez-Vazquez I, Martínez-Zavala SA, Casados-Vázquez LE, Bideshi DK, Barboza-Corona JE. Evaluation of inhibitory compounds produced by bacteria isolated from a hydrogen-producing bioreactor during the self-fermentation of wheat straw. J Appl Microbiol 2022; 133:1989-2001. [PMID: 35808847 DOI: 10.1111/jam.15708] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 06/29/2022] [Accepted: 07/05/2022] [Indexed: 11/28/2022]
Abstract
AIMS The objective of this study was to evaluate the inhibitory activity of compounds secreted by bacteria isolated from a hydrogen-producing bioreactor to understand how these microorganisms interact in this community. METHODS AND RESULTS In vitro inhibitory assays were performed using samples secreted by bacteria subject to different treatments to determine if their inhibitory effect was due to organic acids, non-proteinaceous compounds, or bacteriocin-like inhibitory substances (BLIS). Bacterial isolated were suppressed 43%, 30%, and 27% by neutralized, precipitated, and non-neutralized cell-free supernatants, respectively. Non-hydrogen producers (Non-H2 P) LAB (Lactobacillus plantarum LB1, L. pentosus LB7, Pediococcus acidilactici LB4) and hydrogen producers (H2 P) LAB (Enterococcus faecium F) were inhibited by the production of organic acids, non-proteinaceous compounds, and BLIS. Meanwhile, the obligate anaerobe H2 P (Clostridium beijerinckii B) inhibited by the production of non-proteinaceous compounds and BLIS. The presence of BLIS was confirmed when proteolytic enzymes affected the inhibitory activity of secreted proteins in values ranging from 20 to 42%. The BLIS produced by L. plantarum LB1, P. acidilactici LB4, L. pentosus LB7, and E. faecium F showed molecular masses of ~ 11 kDa, 25 kDa, 20 kDa, and 11 kDa, respectively. CONCLUSIONS It was demonstrated antagonistic interactions between Lactobacillus- Enterococcus, and Pediococcus-Enterococcus species, generated by the secretion of organic acids, non-proteinaceous compounds, and BLIS. SIGNIFICANCE AND IMPACT OF THE STUDY We report the interactions between LAB isolated from hydrogen-producing bioreactors. These interactions might impact the dynamics of the microbial population during hydrogen generation. Our work lays a foundation for strategies that allow controlling bacteria that can affect hydrogen production.
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Affiliation(s)
- Marisol Pérez-Rangel
- Graduate Program in Biosciences, Life Science Division, University of Guanajuato Campus Irapuato-Salamanca. Irapuato, Guanajuato, México.,Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Querétaro, Mexico
| | - Idania Valdez-Vazquez
- Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Querétaro, Mexico
| | - Sheila A Martínez-Zavala
- Graduate Program in Biosciences, Life Science Division, University of Guanajuato Campus Irapuato-Salamanca. Irapuato, Guanajuato, México
| | - Luz E Casados-Vázquez
- Graduate Program in Biosciences, Life Science Division, University of Guanajuato Campus Irapuato-Salamanca. Irapuato, Guanajuato, México.,Food Department, Life Science División, University of Guanajuato Campus Irapuato-Salamanca. Irapuato, Guanajuato, México.,CONACyT-University of Guanajuato
| | - Dennis K Bideshi
- Department of Biological Sciences, California Baptist University, Riverside, California, USA
| | - José E Barboza-Corona
- Graduate Program in Biosciences, Life Science Division, University of Guanajuato Campus Irapuato-Salamanca. Irapuato, Guanajuato, México.,Food Department, Life Science División, University of Guanajuato Campus Irapuato-Salamanca. Irapuato, Guanajuato, México
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Comparison of two different kinds of seed sludge and characterization of microorganisms producing hydrogen and soluble metabolites from raw glycerol. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2022. [DOI: 10.1007/s43153-021-00212-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Fuentes L, Palomo-Briones R, de Jesús Montoya-Rosales J, Braga L, Castelló E, Vesga A, Tapia-Venegas E, Razo-Flores E, Ecthebehere C. Knowing the enemy: homoacetogens in hydrogen production reactors. Appl Microbiol Biotechnol 2021; 105:8989-9002. [PMID: 34716461 DOI: 10.1007/s00253-021-11656-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 09/17/2021] [Accepted: 10/18/2021] [Indexed: 11/29/2022]
Abstract
One of the bottlenecks of the hydrogen production by dark fermentation is the low yields obtained because of the homoacetogenesis persistence, a metabolic pathway where H2 and CO2 are consumed to produce acetate. The central reactions of H2 production and homoacetogenesis are catalyzed by enzyme hydrogenase and the formyltetrahydrofolate synthetase, respectively. In this work, genes encoding for the formyltetrahydrofolate synthetase (fthfs) and hydrogenase (hydA) were used to investigate the diversity of homoacetogens as well as their phylogenetic relationships through quantitative PCR (qPCR) and next-generation amplicon sequencing. A total of 70 samples from 19 different H2-producing bioreactors with different configurations and operating conditions were analyzed. Quantification through qPCR showed that the abundance of fthfs and hydA was strongly associated with the type of substrate, organic loading rate, and H2 production performance. In particular, fthfs sequencing revealed that homoacetogens diversity was low with one or two dominant homoacetogens in each sample. Clostridium carboxivorans was detected in the reactors fed with agave hydrolisates; Acetobacterium woodii dominated in systems fed with glucose; Blautia coccoides and unclassified Sporoanaerobacter species were present in reactors fed with cheese whey; finally, Eubacterium limosum and Selenomonas sp. were co-dominant in reactors fed with glycerol. Altogether, quantification and sequencing analysis revealed that the occurrence of homoacetogenesis could take place due to (1) metabolic changes of H2-producing bacteria towards homoacetogenesis or (2) the displacement of H2-producing bacteria by homoacetogens. Overall, it was demonstrated that the fthfs gene was a suitable marker to investigate homoacetogens in H2-producing reactors. KEY POINTS: • qPCR and sequencing analysis revealed two homoacetogenesis phenomena. • fthfs gene was a suitable marker to investigate homoacetogens in H2 reactors.
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Affiliation(s)
- Laura Fuentes
- Laboratorio de Ecología Microbiana, Departamento de Bioquímica Y Genómica Microbiana, Instituto de Investigaciones Biológicas Clemente Estable, Av. Italia, 3318, Montevideo, Uruguay
| | - Rodolfo Palomo-Briones
- División de Ciencias Ambientales, Instituto Potosino de Investigación Científica Y Tecnológica A.C, Camino a La Presa San José No, 2055, Col. Lomas 4a Sección, C.P., 78216, San Luis Potosí, SLP, México
| | - José de Jesús Montoya-Rosales
- División de Ciencias Ambientales, Instituto Potosino de Investigación Científica Y Tecnológica A.C, Camino a La Presa San José No, 2055, Col. Lomas 4a Sección, C.P., 78216, San Luis Potosí, SLP, México
| | - Lucía Braga
- Laboratorio Bioprocesos Ambientales, Facultad de Ingeniería, Instituto de Ingeniería Química, Universidad de La República, Herrera Y Reissig, 565, Montevideo, Uruguay
| | - Elena Castelló
- Laboratorio Bioprocesos Ambientales, Facultad de Ingeniería, Instituto de Ingeniería Química, Universidad de La República, Herrera Y Reissig, 565, Montevideo, Uruguay
| | - Alejandra Vesga
- Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, 2085, Valparaíso, Av. Brasil, Chile
| | - Estela Tapia-Venegas
- Departamento de Medio Ambiente, Facultad de Ingeniería, Universidad de Playa Ancha Av, Leopoldo Carvallo 270, Valparaíso, Chile
| | - Elías Razo-Flores
- División de Ciencias Ambientales, Instituto Potosino de Investigación Científica Y Tecnológica A.C, Camino a La Presa San José No, 2055, Col. Lomas 4a Sección, C.P., 78216, San Luis Potosí, SLP, México
| | - Claudia Ecthebehere
- Laboratorio de Ecología Microbiana, Departamento de Bioquímica Y Genómica Microbiana, Instituto de Investigaciones Biológicas Clemente Estable, Av. Italia, 3318, Montevideo, Uruguay.
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13
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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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14
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Gabriel-Barajas JE, Arreola-Vargas J, Toledo-Cervantes A, Méndez-Acosta HO, Rivera-González JC, Snell-Castro R. Prokaryotic population dynamics and interactions in an AnSBBR using tequila vinasses as substrate in co-digestion with acid hydrolysates of Agave tequilana var. azul bagasse for hydrogen production. J Appl Microbiol 2021; 132:413-428. [PMID: 34189819 DOI: 10.1111/jam.15196] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 05/27/2021] [Accepted: 06/07/2021] [Indexed: 11/28/2022]
Abstract
AIMS The purpose of this study was to characterize the prokaryotic community and putative microbial interactions between H2 -producing bacteria (HPB) and non-HPB using two anaerobic sequencing batch biofilm reactors (AnSBBRs) fed with tequila vinasses in co-digestion with acid hydrolysates of Agave tequilana var. azul bagasse (ATAB). METHODS AND RESULTS Two AnSBBRs were operated for H2 production to correlate changes in physicochemical and biological variables by principal component analysis (PCA). Results indicated that H2 yield was supported by Ethanoligenens harbinense and Clostridium tyrobutyricum through the PFOR pathway. However, only E. harbinense was able to compete for sugars against non-HPB. Competitive exclusion associated with competition for sugars, depletion of essential trace elements, bacteriocin production and resistance to inhibitory compounds could be carried out by non-HPB, increasing their relative abundances during the dark fermentation (DF) process. CONCLUSIONS The global scenario obtained by PCA correlated the decrease in H2 production with the lactate:acetate molar ratio in the influent. At the beginning of co-digestion, this ratio had the minimum value considered for a net gain of ATP. This fact could cause the reduction of the relative abundance of C. tyrobutyricum. SIGNIFICANCE AND IMPACT OF THE STUDY This is the first study that demonstrated the feasibility of H2 production by Clostridiales from acid hydrolysates of ATAB in co-digestion with tequila vinasses.
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Affiliation(s)
| | - Jorge Arreola-Vargas
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, Texas, USA
| | - Alma Toledo-Cervantes
- Departamento de Ingeniería química, CUCEI-Universidad de Guadalajara, Guadalajara, Jalisco, México
| | - Hugo Oscar Méndez-Acosta
- Departamento de Ingeniería química, CUCEI-Universidad de Guadalajara, Guadalajara, Jalisco, México
| | | | - Raúl Snell-Castro
- Departamento de Ingeniería química, CUCEI-Universidad de Guadalajara, Guadalajara, Jalisco, México
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15
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Pérez-Rangel M, Barboza-Corona JE, Navarro-Díaz M, Escalante AE, Valdez-Vazquez I. The duo Clostridium and Lactobacillus linked to hydrogen production from a lignocellulosic substrate. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2021; 83:3033-3040. [PMID: 34185697 DOI: 10.2166/wst.2021.186] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The study aimed to identify interspecies interactions within a native microbial community present in a hydrogen-producing bioreactor fed with two wheat straw cultivars. The relationships between the microbial community members were studied building a canonical correspondence analysis and corroborated through in vitro assays. The results showed that the bioreactor reached a stable hydrogen production of ca. 86 mL/kg·d in which the cultivar change did not affect the average performance. Lactobacillus and Clostridium dominated throughout the whole operation period where butyric acid was the main metabolite. A canonical correspondence analysis correlated positively Lactobacillus with hydrogen productivity and hydrogen-producing bacteria like Clostridium and Ruminococaceae. Agar diffusion testing of isolated strains confirmed that Lactobacillus inhibited the growth of Enterococcus, but not of Clostridium. We suggest that the positive interaction between Lactobacillus and Clostridium is generated by a division of labor for degrading the lignocellulosic substrate in which Lactobacillus produces lactic acid from the sugar fermentation while Clostridium quickly uses this lactic acid to produce hydrogen and butyric acid. The significance of this work lies in the fact that different methodological approaches confirm a positive association in the duo Lactobacillus-Clostridium in a bioreactor with stable hydrogen production from a complex substrate.
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Affiliation(s)
- Marisol Pérez-Rangel
- Posgrado en Biociencias, División de Ciencias de la Vida, Universidad de Guanajuato CIS, Ex Hacienda El Copal Km. 9, Carretera Irapuato-Silao, Irapuato, 36500 Guanajuato, Mexico
| | - José Eleazar Barboza-Corona
- Posgrado en Biociencias, División de Ciencias de la Vida, Universidad de Guanajuato CIS, Ex Hacienda El Copal Km. 9, Carretera Irapuato-Silao, Irapuato, 36500 Guanajuato, Mexico and Departamento de Alimentos, División de Ciencias de la Vida, Universidad de Guanajuato CIS, Ex Hacienda El Copal Km.9, Carretera Irapuato-Silao, Irapuato, 36500 Guanajuato, Mexico
| | - Marcelo Navarro-Díaz
- Laboratorio Nacional de Ciencias de la Sostenibilidad, Instituto de Ecología, Universidad Nacional Autónoma de México, México City, C.P. 04510, Mexico
| | - Ana Elena Escalante
- Laboratorio Nacional de Ciencias de la Sostenibilidad, Instituto de Ecología, Universidad Nacional Autónoma de México, México City, C.P. 04510, Mexico
| | - Idania Valdez-Vazquez
- Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, 76230 Querétaro, Mexico E-mail:
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16
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Magrini FE, de Almeida GM, da Maia Soares D, Dos Anjos Borges LG, Marconatto L, Giongo A, Paesi S. Variation of the Prokaryotic and Eukaryotic Communities After Distinct Methods of Thermal Pretreatment of the Inoculum in Hydrogen-Production Reactors from Sugarcane Vinasse. Curr Microbiol 2021; 78:2682-2694. [PMID: 34013423 DOI: 10.1007/s00284-021-02527-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 04/28/2021] [Indexed: 02/01/2023]
Abstract
The aim of this study is to evaluate the effect of different thermal pretreatments of the inoculum on the diversity of the microbial community producing hydrogen from sugarcane vinasse. High-throughput sequencing of the 16S and 18S rRNA genes was performed. The reactor samples were also selected for the isolation of strict anaerobes. Decreased microbial diversity was observed with increasing pretreatment temperatures, with Firmicutes predominating: 90% to 97%. The highest abundance of Staphylococcus (7.9%) was found in pretreatment at 120 °C / 20 min at pH 6. The fungal analysis revealed a high prevalence of Candida (47%), Agaricomycetes, Pezizomycotina and Aspergillus in assays with higher H2 production (90° C / 10 min at pH 6). Three species of Clostridium were isolated: C. bifermentans, C. saccharoperbutylacetonicum and C. saccharobutylicum. The isolates were tested separately and in co-cultures for the production of hydrogen. Hydrogen-producing capacity by co-culture of Clostridium species was increased by 18%. Knowing microorganisms and understanding the interaction between eukaryotes and prokaryotes is essential to obtain strategies for biotransformation of vinasse for the production of bioenergy.
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Affiliation(s)
- Flaviane Eva Magrini
- Molecular Diagnostic Laboratory, University of Caxias Do Sul (UCS), Biotechnology Institute, Caxias Do Sul, RS95070-560, Brazil.
| | - Gabriela Machado de Almeida
- Molecular Diagnostic Laboratory, University of Caxias Do Sul (UCS), Biotechnology Institute, Caxias Do Sul, RS95070-560, Brazil
| | - Denis da Maia Soares
- Molecular Diagnostic Laboratory, University of Caxias Do Sul (UCS), Biotechnology Institute, Caxias Do Sul, RS95070-560, Brazil
| | - Luiz Gustavo Dos Anjos Borges
- Institute of Petroleum and Natural Resources, Pontifical Catholic University of Rio Grande Do Sul (PUCRS), Porto Alegre, Brazil
| | - Leticia Marconatto
- Institute of Petroleum and Natural Resources, Pontifical Catholic University of Rio Grande Do Sul (PUCRS), Porto Alegre, Brazil
| | - Adriana Giongo
- Institute of Petroleum and Natural Resources, Pontifical Catholic University of Rio Grande Do Sul (PUCRS), Porto Alegre, Brazil
| | - Suelen Paesi
- Molecular Diagnostic Laboratory, University of Caxias Do Sul (UCS), Biotechnology Institute, Caxias Do Sul, RS95070-560, Brazil
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17
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Castilla-Archilla J, Heiberger J, Mills S, Hilbig J, Collins G, Lens PNL. Continuous Volatile Fatty Acid Production From Acid Brewery Spent Grain Leachate in Expanded Granular Sludge Bed Reactors. FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 2021. [DOI: 10.3389/fsufs.2021.664944] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The production of volatile fatty acids (VFAs) in expanded granular sludge bed (EGSB) reactors using leachate from thermal diluted acid hydrolysis of brewery spent grain was evaluated. Partial inhibition of the anaerobic digestion process to induce VFA accumulation was achieved by applying a high organic loading rate [from 15.3 to 46.0 gCOD/(L·day)], and using a feed with an inlet concentration of 15 g/L total carbohydrates. Two EGSB reactors were operated under identical conditions, both inoculated with the same granular sludge. However, granular sludge in one reactor (R1) was subsequently disaggregated to flocculent sludge by a pH shock, whereas granules remained intact in the other reactor (R2). The hydraulic retention time (HRT) of both reactors was decreased from 36 to 24, 18 and 12 h. The main fermented compounds were acetic acid, butyric acid, propionic acid and ethanol. Despite fluctuations between these products, their total concentration was quite stable throughout the trial at about 134.2 (±27.8) and 141.1 (±21.7) mmol/L, respectively, for R1 and R2. Methane was detected at the beginning of the trial, and following some periods of instability in the granular sludge reactor (R2). The hydrogen yield increased as the HRT decreased. The highest VFA production was achieved in the granular sludge reactor at a 24 h HRT, corresponding to 120.4 (±15.0) mmol/L of VFAs. This corresponded to an acidification level of 83.4 (±5.9) g COD of VFA per 100 gram of soluble COD.
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18
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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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19
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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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20
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Renaudie M, Dumas C, Vuilleumier S, Ernst B. Biohydrogen production in a continuous liquid/gas hollow fiber membrane bioreactor: Efficient retention of hydrogen producing bacteria via granule and biofilm formation. BIORESOURCE TECHNOLOGY 2021; 319:124203. [PMID: 33045545 DOI: 10.1016/j.biortech.2020.124203] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 09/25/2020] [Accepted: 09/27/2020] [Indexed: 06/11/2023]
Abstract
The aim of this work was to develop a continuous liquid/gas membrane bioreactor (L/G MBR), i.e. a fermenting module including hollow fibers membrane for L/G separation, for biohydrogen production by dark fermentation. Originally seeded with sludge from a wastewater treatment plant, the L/G MBR underwent a complete stop for eight months. It was then operated without further reseeding. In the present experiment, performed 551 days after the last reseeding, average hydrogen yield of 1.1 ± 0.2 mol per mol glucose added and hydrogen productivity of 135 ± 22 mL/L/h were reached, with acetate and butyrate as the main metabolite products. DNA sequence analysis revealed that Clostridium beijerinckii, Clostridium pasteurianum and Enterobacter sp. were dominant in liquid outlet, in a biofilm on the surface of the hollow fibers and in microbial granules. The L/G MBR has potential for the concentration and the long-term maintenance of an active hydrogen-producing bacterial community without need for reseeding.
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Affiliation(s)
- Marie Renaudie
- Université de Strasbourg, CNRS, IPHC UMR7178, F-67000 Strasbourg, France; French Environment and Energy Management Agency, Angers, France
| | - Christine Dumas
- Université de Strasbourg, CNRS, IPHC UMR7178, F-67000 Strasbourg, France
| | - Stéphane Vuilleumier
- Génétique Moléculaire, Génomique, Microbiologie (GMGM) UMR 7156 CNRS-Université de Strasbourg, Strasbourg, France
| | - Barbara Ernst
- Université de Strasbourg, CNRS, IPHC UMR7178, F-67000 Strasbourg, France.
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Dauptain K, Trably E, Santa-Catalina G, Bernet N, Carrere H. Role of indigenous bacteria in dark fermentation of organic substrates. BIORESOURCE TECHNOLOGY 2020; 313:123665. [PMID: 32574750 DOI: 10.1016/j.biortech.2020.123665] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 06/08/2020] [Accepted: 06/09/2020] [Indexed: 06/11/2023]
Abstract
Hydrogen production by dark fermentation of complex organic substrates, such as biowaste, can naturally take place with indigenous bacteria or by adding an external microbial inoculum issued from various natural environments. This study aims to determine whether indigenous bacteria associated with thermal pretreatment could impact dark fermentation performances. Biochemical hydrogen potential tests were carried out on seven organic substrates. Results showed a strong influence of the indigenous bacteria which are as effective as thermally pretreated exogenous bacteria to produce H2 and metabolites. High abundance in Clostridiales and/or Enterobacteriales was associated with high H2 yield. This study shows that no inoculum nor pretreatment are required to achieve satisfactory dark fermentation performances from organic waste.
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Affiliation(s)
- K Dauptain
- INRAE, Université de Montpellier, LBE, 102 avenue des Étangs, 11100 Narbonne, France
| | - E Trably
- INRAE, Université de Montpellier, LBE, 102 avenue des Étangs, 11100 Narbonne, France.
| | - G Santa-Catalina
- INRAE, Université de Montpellier, LBE, 102 avenue des Étangs, 11100 Narbonne, France
| | - N Bernet
- INRAE, Université de Montpellier, LBE, 102 avenue des Étangs, 11100 Narbonne, France
| | - H Carrere
- INRAE, Université de Montpellier, LBE, 102 avenue des Étangs, 11100 Narbonne, France
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Biohydrogen production beyond the Thauer limit by precision design of artificial microbial consortia. Commun Biol 2020; 3:443. [PMID: 32796915 PMCID: PMC7429504 DOI: 10.1038/s42003-020-01159-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 07/23/2020] [Indexed: 01/25/2023] Open
Abstract
Dark fermentative biohydrogen (H2) production could become a key technology for providing renewable energy. Until now, the H2 yield is restricted to 4 moles of H2 per mole of glucose, referred to as the "Thauer limit". Here we show, that precision design of artificial microbial consortia increased the H2 yield to 5.6 mol mol-1 glucose, 40% higher than the Thauer limit. In addition, the volumetric H2 production rates of our defined artificial consortia are superior compared to any mono-, co- or multi-culture system reported to date. We hope this study to be a major leap forward in the engineering of artificial microbial consortia through precision design and provide a breakthrough in energy science, biotechnology and ecology. Constructing artificial consortia with this drawing-board approach could in future increase volumetric production rates and yields of other bioprocesses. Our artificial consortia engineering blueprint might pave the way for the development of a H2 production bioindustry.
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23
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Lavergne C, Bovio-Winkler P, Etchebehere C, García-Gen S. Towards centralized biogas plants: Co-digestion of sewage sludge and pig manure maintains process performance and active microbiome diversity. BIORESOURCE TECHNOLOGY 2020; 297:122442. [PMID: 31780241 DOI: 10.1016/j.biortech.2019.122442] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 11/13/2019] [Accepted: 11/15/2019] [Indexed: 06/10/2023]
Abstract
The aim of this study is to assess the performance of anaerobic digestion against co-digestion systems during the start-up stages based on key process parameters and biological indicators. Two parallel experiments treating sewage sludge alone or co-digested with low concentration of pig manure (8% vol., 2-3% in COD basis) were carried out in two lab-scale CSTR at mesophilic conditions. Same inoculant and organic loading rate sequences were applied for two consecutive runs of 79 and 90 days. According to the removal efficiencies achieved, no significant differences were encountered amongst mono-digestion and co-digestion. This observation was reinforced with the analysis of the total/active microbiome, sequencing 16S rRNA genes and transcripts. The addition of a co-substrate at low concentration had a negligible effect on the total/active microbial communities; they evolved following the same pattern. This might be an advantage in order to upgrade existing wastewater treatment plants to become centralized biogas facilities.
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Affiliation(s)
- Céline Lavergne
- Escuela Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, Avenida Brasil 2085, 2340950 Valparaíso, Chile
| | - Patricia Bovio-Winkler
- Microbial Ecology Laboratory, Department of Microbial Biochemistry and Genomic, Biological Research Institute "Clemente Estable", Avenida Italia 3318, 11600 Montevideo, Uruguay
| | - Claudia Etchebehere
- Microbial Ecology Laboratory, Department of Microbial Biochemistry and Genomic, Biological Research Institute "Clemente Estable", Avenida Italia 3318, 11600 Montevideo, Uruguay
| | - Santiago García-Gen
- Departamento de Ingeniería Química y Ambiental, Universidad Técnica Federico Santa María, Avenida España 1680, 2390123 Valparaíso, Chile.
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Farghaly A, Roux SL, Peu P, Dabert P, Tawfik A. Effect of starvation period on microbial community producing hydrogen from paperboard mill wastewater using anaerobic baffled reactor. ENVIRONMENTAL TECHNOLOGY 2019; 40:2389-2399. [PMID: 29558319 DOI: 10.1080/09593330.2018.1454512] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Accepted: 02/11/2018] [Indexed: 06/08/2023]
Abstract
The aim of this study is to highlight the robustness and potentials of the anaerobic baffled reactor (ABR) configuration on keeping the microbial richness and diversity after starvation period of 7 days. The module at steady state operating conditions provided an average volumetric hydrogen production (VHP) of 0.2 ± 0.08 and 0.423 ± 0.5 l/d in the 1st and last compartment (C4). The VHP was gradually decreased from 0.2 to 0.003 l/d and from 0.423 to 0.1 l/d in compartments (C1 and C4) respectively during feed less period. However, the VHP was substantially increased up to 0.035 and 0.152 l/d in 1st (C1) and fourth compartment (C4) within 24 h, after reoperation of the ABR. Moreover, the H2 producers of Clostridiaceae, Ruminococcaceae, and Enterobacteriaceae families were dominant in the reactor after reoperation process. Quantitative polymerase chain reaction and next-generation sequencing methods results revealed that the microbial community structure was mainly composed of Proteobacteria, Firmicutes, Chloroflexi, Bacteroidetes, Planctomycetes, and Actinobacteria. The results showed the unique properties of the ABR configuration for keeping the microbial richness and diversity during feed less period.
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Affiliation(s)
- Ahmed Farghaly
- a Environmental Engineering Department, Egypt - Japan University of Science and Technology (E-JUST) , Alexandria , Egypt
| | | | | | | | - Ahmed Tawfik
- a Environmental Engineering Department, Egypt - Japan University of Science and Technology (E-JUST) , Alexandria , Egypt
- b Water Pollution Research Department, National Research Centre , Giza , Egypt
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Detman A, Mielecki D, Chojnacka A, Salamon A, Błaszczyk MK, Sikora A. Cell factories converting lactate and acetate to butyrate: Clostridium butyricum and microbial communities from dark fermentation bioreactors. Microb Cell Fact 2019; 18:36. [PMID: 30760264 PMCID: PMC6373154 DOI: 10.1186/s12934-019-1085-1] [Citation(s) in RCA: 80] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Accepted: 01/31/2019] [Indexed: 12/26/2022] Open
Abstract
Background Interactions between microorganisms during specific steps of anaerobic digestion determine metabolic pathways in bioreactors and consequently the efficiency of fermentation processes. This study focuses on conversion of lactate and acetate to butyrate by bacteria of dark fermentation. The recently recognized flavin-based electron bifurcation as a mode of energy coupling by anaerobes increases our knowledge of anaerobic lactate oxidation and butyrate formation. Results Microbial communities from dark fermentation bioreactors or pure culture of Clostridium butyricum are able to convert lactate and acetate to butyrate in batch experiments. The ability of C. butyricum to transform lactate and acetate to butyrate was shown for the first time, with ethanol identified as an additional end product of this process. A search for genes encoding EtfAB complexes and their gene neighbourhood in C. butyricum and other bacteria capable of lactate and acetate conversion to butyrate as well as butyrate-producers only and the lactate oxidiser Acetobacterium woodii, revealed that the Etf complexes involved in (i) lactate oxidation and (ii) butyrate synthesis, form separate clusters. There is a more extent similarity between Etf subunits that are involved in lactate oxidation in various species (e.g. A. woodii and C. butyricum) than between the different etf gene products within the same species of butyrate producers. A scheme for the metabolic pathway of lactate and acetate transformation to butyrate in C. butyricum was constructed. Conclusions Studies on the conversion of lactate and acetate to butyrate by microbial communities from dark fermentation bioreactors or Clostridium butyricum suggest that a phenomenon analogous to cross-feeding of lactate in gastrointestinal tract also occurs in hydrogen-yielding reactors. A scheme of lactate and acetate transformation pathway is proposed, based on the example of C. butyricum, which employs flavin-based electron bifurcation. This process utilizes electron-transferring flavoprotein (Etf) complexes specific for (i) lactate oxidation and (ii) butyrate formation. Phylogenetic analysis revealed that such complexes are encoded in the genomes of other bacteria capable of lactate and acetate conversion to butyrate. These findings contribute significantly to our understanding of the metabolic pathways and symbiotic interactions between bacteria during the acidogenic step of anaerobic digestion.
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Affiliation(s)
- Anna Detman
- Institute of Biochemistry and Biophysics - Polish Academy of Sciences, Pawińskiego 5a, 02-106, Warsaw, Poland
| | - Damian Mielecki
- Institute of Biochemistry and Biophysics - Polish Academy of Sciences, Pawińskiego 5a, 02-106, Warsaw, Poland
| | - Aleksandra Chojnacka
- Institute of Biochemistry and Biophysics - Polish Academy of Sciences, Pawińskiego 5a, 02-106, Warsaw, Poland
| | - Agnieszka Salamon
- Institute of Agricultural and Food Biotechnology, Rakowiecka 36, 02-532, Warsaw, Poland
| | - 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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Judith Martínez E, Blanco D, Gómez X. Two-Stage Process to Enhance Bio-hydrogen Production. BIOFUEL AND BIOREFINERY TECHNOLOGIES 2019. [DOI: 10.1007/978-3-030-10516-7_7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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27
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Wazeri A, Elsamadony M, Roux SL, Peu P, Tawfik A. Potentials of using mixed culture bacteria incorporated with sodium bicarbonate for hydrogen production from water hyacinth. BIORESOURCE TECHNOLOGY 2018; 263:365-374. [PMID: 29763800 DOI: 10.1016/j.biortech.2018.05.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 05/02/2018] [Accepted: 05/07/2018] [Indexed: 06/08/2023]
Abstract
The aim of this study is to assess the potentials of using mixed culture bacteria incorporated with different concentrations of NaHCO3 for hydrogen production from water hyacinth (WH). The lowest hydrogen yield (HY) of 30.4 ± 1.9 mL/gTVS, H2 content (HC) of 19.5 ± 1.5% and hydrogenase enzyme (HE) activity of 0.06 ± 0.01 mgM.Breduced/min were registered for the cultures without supplementation of NaHCO3. The HY, HC, and HE activity were maximized at levels of 69.2 ± 4.3 mL/gTVS, 58.4 ± 3.6% and 0.18 ± 0.01 mgM.Breduced/min. respectively for the anaerobes supplied with 3.0 g NaHCO3/L. Furthermore, cellulose, hemicellulose, and lignin destruction efficiencies were 37.2 ± 2.3, 30.0 ± 1.9 and 20.9 ± 1.3% respectively due to the increase of cellulase and xylanase activities up to 2.73 ± 0.17 and 1.87 ± 0.12 U/mL, respectively. Moreover, the abundance of Firmicutes was substantially increased and accounted for 71% of the total OTU's. Microbes belonging to the order Clostridiales and OPB54 were particularly enriched in the medium supplemented with NaHCO3.
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Affiliation(s)
- Alaa Wazeri
- Egypt-Japan University of Science and Technology (E-JUST), Environmental Engineering Department, P.O. Box 179, New Borg El-Arab City, Alexandria 21934, Egypt; South Valley University, Faculty of Engineering, Civil Engineering Department, 83523 Qena City, Egypt.
| | - Mohamed Elsamadony
- Egypt-Japan University of Science and Technology (E-JUST), Environmental Engineering Department, P.O. Box 179, New Borg El-Arab City, Alexandria 21934, Egypt; Tanta University, Faculty of Engineering, Public Works Engineering Department, 31521 Tanta City, Egypt.
| | - Sophie Le Roux
- Université Bretagne Loire, Irstea, UR OPAALE, 17 av. de Cucillé, CS 64427, F-35044 Rennes, France
| | - Pascal Peu
- Université Bretagne Loire, Irstea, UR OPAALE, 17 av. de Cucillé, CS 64427, F-35044 Rennes, France
| | - Ahmed Tawfik
- Egypt-Japan University of Science and Technology (E-JUST), Environmental Engineering Department, P.O. Box 179, New Borg El-Arab City, Alexandria 21934, Egypt; National Research Centre, Water Pollution Research Department, Giza 12622, Egypt.
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Fuentes L, Braga L, Castelló E, Etchebehere C. Work scheme to isolate the different micro-organisms found in hydrogen-producing reactors: a study of effectiveness by pyrosequencing analysis. J Appl Microbiol 2018; 125:96-110. [DOI: 10.1111/jam.13763] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 01/30/2018] [Accepted: 03/05/2018] [Indexed: 01/08/2023]
Affiliation(s)
- L. Fuentes
- Microbial Ecology Laboratory; Microbial Biochemistry and Genomics Department; Biological Research Institute “Clemente Estable”; Montevideo Uruguay
| | - L. Braga
- Microbial Ecology Laboratory; Microbial Biochemistry and Genomics Department; Biological Research Institute “Clemente Estable”; Montevideo Uruguay
- BioProA Laboratory; Faculty of Engineering; University of the Republic; Montevideo Uruguay
| | - E. Castelló
- BioProA Laboratory; Faculty of Engineering; University of the Republic; Montevideo Uruguay
| | - C. Etchebehere
- Microbial Ecology Laboratory; Microbial Biochemistry and Genomics Department; Biological Research Institute “Clemente Estable”; Montevideo Uruguay
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Palomo-Briones R, Trably E, López-Lozano NE, Celis LB, Méndez-Acosta HO, Bernet N, Razo-Flores E. Hydrogen metabolic patterns driven by Clostridium-Streptococcus community shifts in a continuous stirred tank reactor. Appl Microbiol Biotechnol 2018; 102:2465-2475. [DOI: 10.1007/s00253-018-8737-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 12/20/2017] [Accepted: 12/22/2017] [Indexed: 01/08/2023]
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Inferring microbial interactions in thermophilic and mesophilic anaerobic digestion of hog waste. PLoS One 2017; 12:e0181395. [PMID: 28732056 PMCID: PMC5521784 DOI: 10.1371/journal.pone.0181395] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2017] [Accepted: 07/02/2017] [Indexed: 11/19/2022] Open
Abstract
Anaerobic digestion (AnD) is a microbiological process that converts organic waste materials into biogas. Because of its high methane content, biogas is a combustible energy source and serves as an important environmental technology commonly used in the management of animal waste generated on large animal farms. Much work has been done on hardware design and process engineering for the generation of biogas. However, little is known about the complexity of the microbiology in this process. In particular, how microbes interact in the digester and eventually breakdown and convert organic matter into biogas is still regarded as a "black box." We used 16S rRNA sequencing as a tool to study the microbial community in laboratory hog waste digesters under tightly controlled conditions, and systematically unraveled the distinct interaction networks of two microbial communities from mesophilic (MAnD) and thermophilic anaerobic digestion (TAnD). Under thermophilic conditions, the well-known association between hydrogen-producing bacteria, e.g., Ruminococcaceae and Prevotellaceae, and hydrotrophic methanogens, Methanomicrobiaceae, was reverse engineered by their interactive topological niches. The inferred interaction network provides a sketch enabling the determination of microbial interactive relationships that conventional strategy of finding differential taxa was hard to achieve. This research is still in its infancy, but it can help to depict the dynamics of microbial ecosystems and to lay the groundwork for understanding how microorganisms cohabit in the anaerobic digester.
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Zhou GW, Yang XR, Marshall CW, Li H, Zheng BX, Yan Y, Su JQ, Zhu YG. Biochar Addition Increases the Rates of Dissimilatory Iron Reduction and Methanogenesis in Ferrihydrite Enrichments. Front Microbiol 2017; 8:589. [PMID: 28428774 PMCID: PMC5382251 DOI: 10.3389/fmicb.2017.00589] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 03/21/2017] [Indexed: 12/13/2022] Open
Abstract
Biochar contains quinones and aromatic structures that facilitate extracellular electron transfer between microbial cells and insoluble minerals. In this study, granulated biochar (1.2-2 mm) and powdered biochar (<0.15 mm) were amended to two ferrihydrite (in situ ferrihydrite and ex situ ferrihydrite) enrichments to investigate the effect of biochar with different particle sizes on dissimilatory iron(III)-reducing bacteria (DIRB) and methanogens. Biochar addition significantly stimulated the reduction of both in situ ferrihydrite and ex situ ferrihydrite and the production of methane. Powdered biochar amendments increased iron reduction compared to granulated biochar amendment in both the in situ ferrihydrite and ex situ ferrihydrite enrichments. However, no significant difference was observed in methane production between the powdered biochar and granulated biochar amendments in the two ferrihydrite enrichments. Analysis of 16S rRNA gene sequences showed that both DIRB and methanogens were enriched after biochar amendments in the in situ ferrihydrite and ex situ ferrihydrite enrichments. Taxa belonging to the Geobacteraceae and methanogenic genus affiliated to Methanosarcina were detected with significantly higher relative abundances in powdered biochar amendments than those in granulated biochar amendments in both the ferrihydrite enrichments. X-ray diffraction analysis indicated green rust [Fe2(CO3) (OH)] and vivianite [Fe3(PO4)2 8(H2O)] formed in the ex situ ferrihydrite and in situ ferrihydrite enrichments without biochar addition, respectively. After granulated biochar amendment, the mineral phase changed from the green rust to vivianite in the ex situ ferrihydrite enrichment, while crystalline vivianite and iron oxide (γ-Fe2O3) were detected simultaneously in the in situ ferrihydrite enrichment. No crystalline iron compound was found in the powdered biochar amendments in both ferrihydrite enrichments. Overall, our study illustrated that the addition of biochar affected iron-reducing and methane-generating microbial communities to some extent.
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Affiliation(s)
- Guo-Wei Zhou
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of SciencesXiamen, China
- University of Chinese Academy of SciencesBeijing, China
| | - Xiao-Ru Yang
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of SciencesXiamen, China
| | - Christopher W. Marshall
- Department of Surgery, University of ChicagoChicago, IL, USA
- Biosciences Division, Argonne National LaboratoryLemont, IL, USA
| | - Hu Li
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of SciencesXiamen, China
| | - Bang-Xiao Zheng
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of SciencesXiamen, China
- University of Chinese Academy of SciencesBeijing, China
| | - Yu Yan
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of SciencesXiamen, China
- University of Chinese Academy of SciencesBeijing, China
| | - Jian-Qiang Su
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of SciencesXiamen, China
| | - Yong-Guan Zhu
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of SciencesXiamen, China
- State Key Lab of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of SciencesBeijing, China
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Microbial fuel cell coupled to biohydrogen reactor: a feasible technology to increase energy yield from cheese whey. Bioprocess Biosyst Eng 2017; 40:807-819. [DOI: 10.1007/s00449-017-1746-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Accepted: 01/25/2017] [Indexed: 11/25/2022]
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