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Xu H, Miao J, Wang J, Deng J, Zhang J, Kou Q, Xiong X, Holmes DE. Integrated CO 2 capture and conversion via H 2-driven CO 2 biomethanation: Cyclic performance and microbial community response. BIORESOURCE TECHNOLOGY 2024; 393:130055. [PMID: 37995871 DOI: 10.1016/j.biortech.2023.130055] [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: 09/24/2023] [Revised: 11/16/2023] [Accepted: 11/16/2023] [Indexed: 11/25/2023]
Abstract
This study investigated the use of H2-driven CO2 biomethanation for integrated CO2 capture and conversion (iCCC). Anaerobic chambers containing Na2CO3-amended microbial growth medium provided with H2 were inoculated with anaerobic granular sludge. Microorganisms were enriched that could regenerate carbonate by using the bicarbonate formed from CO2 absorption to generate methane. Multiple absorption-regeneration cycles were performed and effective restoration of CO2 absorption capacity and stable carbonate recycling via CO2 biomethanation were observed for CO2 absorbents adjusted to three different pH values (9.0, 9.5, and 10.0). The pH = 10.0 group had the highest CO2 absorption capacity; 65.3 mmol/L in the 5th cycle. A slight alkaline inhibition of acetoclastic methanogenesis occurred near the end of regeneration, but had limited impact on the cyclic performance of the iCCC process. Microbial communities were dominated by H2-utilizing and alkali-tolerant species that could participate in CO2 biomethanation and survive under alternating neutral and alkaline conditions.
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Affiliation(s)
- Heng Xu
- School of Chemical & Environmental Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
| | - Jiahui Miao
- School of Chemical & Environmental Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
| | - Jianbing Wang
- School of Chemical & Environmental Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
| | - Jiushuai Deng
- School of Chemical & Environmental Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
| | - Jiayin Zhang
- School of Chemical & Environmental Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
| | - Qingshuang Kou
- School of Chemical & Environmental Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
| | - Xia Xiong
- Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture and Rural Affairs, Chengdu 610041, China.
| | - Dawn E Holmes
- Department of Physical and Biological Sciences, Western New England University, 1215 Wilbraham Road, Springfield, MA 01119, United States
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Andreides D, Lopez Marin MA, Zabranska J. Selective syngas fermentation to acetate under acidic and psychrophilic conditions using mixed anaerobic culture. BIORESOURCE TECHNOLOGY 2024; 394:130235. [PMID: 38141884 DOI: 10.1016/j.biortech.2023.130235] [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: 11/12/2023] [Revised: 12/15/2023] [Accepted: 12/19/2023] [Indexed: 12/25/2023]
Abstract
Syngas fermentation to acetate offers a promising solution for its valorisation, particularly when syngas contains a high N2 concentration, which otherwise impedes the utilisation of syngas biomethanation gaseous product in cogeneration or upgrading units. In this study, continuous lab-scale syngas fermentation assessing the effects of acidic pH and psychrophilic conditions (28 °C and 20 °C) on bioconversion efficiency and anaerobic consortium diversity was studied. The results showed that as temperature and pH decrease, acetate yield increases. The highest H2 and CO consumption rates were observed at 20 °C and pH 4.5, reaching 48.4 mmol/(L·d) and 31.5 mmol/(L·d), respectively, and methanogenic activity was not completely suppressed. The microbial community composition indicated an enhanced abundance of acetate-producing bacteria and hydrogenotrophic methanogens at 28 °C. The PICRUSt2 prediction of metabolic potential indicated that temperature and pH changes appear to have a more pronounced impact on acetotrophic methanogenesis genes than carbon dioxide-based methanogenesis genes.
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Affiliation(s)
- Dominik Andreides
- Department of Water Technology and Environmental Engineering, Faculty of Environmental Technology, University of Chemistry and Technology Prague, Technicka 1905, 166 28 Prague, Czech Republic.
| | - Marco A Lopez Marin
- Department of Water Technology and Environmental Engineering, Faculty of Environmental Technology, University of Chemistry and Technology Prague, Technicka 1905, 166 28 Prague, Czech Republic
| | - Jana Zabranska
- Department of Water Technology and Environmental Engineering, Faculty of Environmental Technology, University of Chemistry and Technology Prague, Technicka 1905, 166 28 Prague, Czech Republic
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Mumtha C, Subashri D, Mahalingam PU. Enhancing biohydrogen production from mono-substrates and co-substrates using a novel bacterial strains. 3 Biotech 2023; 13:270. [PMID: 37449248 PMCID: PMC10335983 DOI: 10.1007/s13205-023-03687-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 06/25/2023] [Indexed: 07/18/2023] Open
Abstract
The staggering increase in pollution associated with a sharp tightening in global energy demand is a major concern for organic substances. Renewable biofuel production through simultaneous waste reduction is a sustainable approach to meet this energy demand. This study co-fermentation of dairy whey and SCB was performed using mixed and pure bacterial cultures of Salmonella bongori, Escherichia coli, and Shewanella oneidensis by dark fermentation process for hydrogen production. The maximum H2 production was 202.7 ± 5.5 H2/mL/L, 237.3 ± 6.0 H2/mL/L, and 198 ± 9.9 H2/mL/L obtained in fermentation reactions containing dairy whey, solid and liquid hydrolysis of pretreated sugarcane bagasse as mono-substrates. The H2 production was greater in co-substrate by 347.3 ± 18.5 H2/mL/L under optimized conditions (pH 7.0, temperature 37 °C, substrate concentration 30:50 g/L) than expected in mono-substrate conditions, which confirms that co-fermentation of different substrates enhances the H2 potential. Fermentation medium during bio-H2 production under GC analysis has stated that using mixed cultures in dark fermentation favored acetic acid and butyric acid. Co-substrate degradation produces ethyl alcohol, benzoic acid, propionic acid, and butanol as metabolic by-products. The difference in the treated and untreated substrate and carbon enrichment in the substrates was evaluated by FT-IR analysis. The present study justifies that rather than the usage of mono-substrate for bio-H2 production, the co-substrate provided highly stable H2 production by mixed bacterial cultures. Fabricate the homemade single-chamber microbial fuel cell to generate electricity. Supplementary Information The online version contains supplementary material available at 10.1007/s13205-023-03687-9.
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Affiliation(s)
- Chelladurai Mumtha
- Department of Biology, The Gandhigram Rural Institute (Deemed to Be University), Gandhigram, Dindigul, 624 302 Tamil Nadu India
| | - Dhanasekaran Subashri
- Department of Biology, The Gandhigram Rural Institute (Deemed to Be University), Gandhigram, Dindigul, 624 302 Tamil Nadu India
| | - Pambayan Ulagan Mahalingam
- Department of Biology, The Gandhigram Rural Institute (Deemed to Be University), Gandhigram, Dindigul, 624 302 Tamil Nadu India
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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: 9] [Impact Index Per Article: 9.0] [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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Wang L, Lei Z, Zhang Z, Shimizu K, Yuan T, Li S, Liu S. Insight into enhanced acetic acid production from food waste in anaerobic hydrolysis/acidification with Fe 3O 4 supplementation. WASTE MANAGEMENT (NEW YORK, N.Y.) 2022; 150:310-319. [PMID: 35901642 DOI: 10.1016/j.wasman.2022.07.019] [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: 02/17/2022] [Revised: 06/10/2022] [Accepted: 07/16/2022] [Indexed: 06/15/2023]
Abstract
Fe3O4 supplementation has been reported as a high-efficient approach to enhance biogas production in anaerobic digestion (AD). Volatile fatty acids (VFAs), especially acetic acid (HAc), are considered as important products in acidification process of AD. However, the possible mechanisms involved in promotion effect of Fe3O4 on HAc production in hydrolysis and acidification processes of AD have not been comprehensively studied. This study first investigated the promotion effect of Fe3O4 on hydrolysis, acidogenesis and acetogenesis stages of AD and proposed the underlying mechanisms, using food waste (FW) as the feedstock, which is considered as the most suitable substrate for VFAs production. Results indicated that the HAc production (77.38 g-C/kg-VS) was enhanced by 79 % in AD of FW with addition of 10 g/L Fe3O4. The duration to reach the maximum HAc production was also shortened from 14 days to 10 days. The AD tests using model substrates revealed that Fe3O4 enhanced hydrolysis, acidogenesis, and degradation of propionic acid, thus resulting in enhanced HAc production. The enhanced activities of hydrolytic and acid-forming enzymes, and electron transport system (ETS) with Fe3O4 addition further demonstrated its function as an electron acceptor to stimulate electron transfer and accelerate microbial metabolisms in AD, which contributed to the enhanced HAc production from FW.
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Affiliation(s)
- Lanting Wang
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
| | - Zhongfang Lei
- Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
| | - Zhenya Zhang
- Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
| | - Kazuya Shimizu
- Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
| | - Tian Yuan
- Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
| | - Shengnan Li
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
| | - Siting Liu
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
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6
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Development of Stable Mixed Microbiota for High Yield Power to Methane Conversion. ENERGIES 2021. [DOI: 10.3390/en14217336] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The performance of a mixed microbial community was tested in lab-scale power-to-methane reactors at 55 °C. The main aim was to uncover the responses of the community to starvation and stoichiometric H2/CO2 supply as the sole substrate. Fed-batch reactors were inoculated with the fermentation effluent of a thermophilic biogas plant. Various volumes of pure H2/CO2 gas mixtures were injected into the headspace daily and the process parameters were followed. Gas volumes and composition were measured by gas-chromatography, the headspace was replaced with N2 prior to the daily H2/CO2 injection. Total DNA samples, collected at the beginning and end (day 71), were analyzed by metagenome sequencing. Low levels of H2 triggered immediate CH4 evolution utilizing CO2/HCO3− dissolved in the fermentation effluent. Biomethanation continued when H2/CO2 was supplied. On the contrary, biomethane formation was inhibited at higher initial H2 doses and concomitant acetate formation indicated homoacetogenesis. Biomethane production started upon daily delivery of stoichiometric H2/CO2. The fed-batch operational mode allowed high H2 injection and consumption rates albeit intermittent operation conditions. Methane was enriched up to 95% CH4 content and the H2 consumption rate attained a remarkable 1000 mL·L−1·d−1. The microbial community spontaneously selected the genus Methanothermobacter in the enriched cultures.
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Policastro G, Carraturo F, Compagnone M, Giugliano M, Guida M, Luongo V, Napolitano R, Fabbricino M. A preliminary study on a novel bioaugmentation technique enhancing lactic acid production by mixed cultures fermentation. BIORESOURCE TECHNOLOGY 2021; 340:125595. [PMID: 34333344 DOI: 10.1016/j.biortech.2021.125595] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 07/13/2021] [Accepted: 07/14/2021] [Indexed: 06/13/2023]
Abstract
The paper is a preliminary study on the selection of lactic acid producing microorganisms from a mixed microbial population via bioaugmentation. The bioaugmentation technique is based on pH sudden variations occurring in sequential batch steps of a dark fermentation process applied to simple substrates. Different conditions are tested and compared. The structure of microbial communities and concentrations of metabolic intermediates are analyzed to study the possible substrate conversion routes. Obtained results indicate that the initial mixed culture produced a lactic acid percentage of 5% in terms of CODLA/CODPRODUCTS. In the most favourable conditions, the selected culture produced a lactic acid percentage of 59%. The analysis of the composition of microbial communities before and after the bioaugmentation processes, indicates that lactic acid production mainly results from the population change to bacteria belonging to the genus Bacillus. Indeed, the relative abundance of Bacilli increased from 0.67%, to 8.40% during the bioaugmentation cycle.
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Affiliation(s)
- Grazia Policastro
- Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, via Claudio 21, Naples 80125, Italy.
| | - Federica Carraturo
- Department of Biology, University of Naples Federico II, via Cintia 21, Naples 80126, Italy.
| | - Mariacristina Compagnone
- Department of Chemical Engineering and Food Technologies, Faculty of Sciences, University of Cádiz, 11510 Puerto Real, Cádiz, Spain.
| | - Marco Giugliano
- Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, via Claudio 21, Naples 80125, Italy.
| | - Marco Guida
- Department of Biology, University of Naples Federico II, via Cintia 21, Naples 80126, Italy.
| | - Vincenzo Luongo
- Department of Mathematics and Applications Renato Caccioppoli, University of Naples Federico II, via Cintia, Monte S. Angelo, Naples I-80126, Italy.
| | - Raffaele Napolitano
- Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, via Claudio 21, Naples 80125, Italy.
| | - Massimiliano Fabbricino
- Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, via Claudio 21, Naples 80125, Italy.
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Sun H, Zhang L, Zhang Y, Guo B, Liu Y. A new non-steady-state mass balance model for quantifying microbiome responses to disturbances in wastewater bioreactors. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 296:113370. [PMID: 34351289 DOI: 10.1016/j.jenvman.2021.113370] [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: 04/26/2021] [Revised: 07/06/2021] [Accepted: 07/21/2021] [Indexed: 06/13/2023]
Abstract
Herein we proposed an ecology model, based on a non-steady-state mass balance (16S rRNA MiSeq reads normalized by volatile suspended solids), to quantify microbiome responses to disturbances in wastewater bioreactors. Rather than focusing on the most abundant microbial groups commonly used in the literature, the goal of the model was to identify active species within the community. The model incorporated the temporal changes of operational taxonomic units following a disturbance, through considering the density and type of genotypes in the influent entering the bioreactor, in the effluent leaving the bioreactor, growing in the bioreactor, and in the waste sludge discharged from the bioreactor continuously or instantaneously, as well as the prior microbial community and the sludge characteristics. One application of this model demonstrated that significant differences existed between the key populations responding to an increasing organic loading rate and the dominant species in a high-rate thermophilic upflow anaerobic sludge blanket reactor.
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Affiliation(s)
- Huijuan Sun
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Lei Zhang
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Yingdi Zhang
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Bing Guo
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Yang Liu
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada.
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Huang J, Zhao Y, Lei C, Liu Y, Wang Y. The effect of reduced pressure and glucose concentration on hydrogen and volatile fatty acid yield: The role of homoacetogenesis. BIORESOURCE TECHNOLOGY 2021; 329:124830. [PMID: 33639380 DOI: 10.1016/j.biortech.2021.124830] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 02/03/2021] [Accepted: 02/04/2021] [Indexed: 06/12/2023]
Abstract
In this study, the influence of headspace pressure (HP; 20-100 kPa) and organic loading rate (OLR; 10-30 g/L) on H2 and volatile fatty acid (VFA) yield were investigated. The experiments were carried out in the semi-continuous mode, the main products in VFAs were ethanol and butyrate, which accounted for more than 75%. More than 79% generated H2 was consumed through homoacetogenesis pathway when HP was 100 kPa, and lowing HP could effectively promote the accumulation of H2 (increased by at least 2 times). Even though consumed H2 through homoacetogenesis was related to OLR and HP, the lower HP was more likely to reduce this part H2 consumption, especially under 10 g/L condition. As for acid production rate, both OLR and HP have a significant effect (p < 0.05). Maximum acid production rate was 489.86 mg-COD/g-CODdegrade·d-1when OLR was 20 g/L and HP was 40 kPa.
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Affiliation(s)
- Jialong Huang
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, PR China
| | - Yongkun Zhao
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, PR China
| | - Chen'ao Lei
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, PR China
| | - Yu Liu
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Yuanyuan Wang
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, PR China.
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Liu C, Ren L, Yan B, Luo L, Zhang J, Awasthi MK. Electron transfer and mechanism of energy production among syntrophic bacteria during acidogenic fermentation: A review. BIORESOURCE TECHNOLOGY 2021; 323:124637. [PMID: 33421831 DOI: 10.1016/j.biortech.2020.124637] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 12/25/2020] [Accepted: 12/26/2020] [Indexed: 06/12/2023]
Abstract
Volatile fatty acids (VFAs) production plays an important role in the process of anaerobic digestion (AD), which is often the critical factor determining the metabolic pathways and energy recovery efficiency. Fermenting bacteria and acetogenic bacteria are in syntrophic relations during AD. Thus, clear elucidation of the interspecies electron transfer and energetic mechanisms among syntrophic bacteria is essential for optimization of acidogenic. This review aims to discuss the electron transfer and energetic mechanism in syntrophic processes between fermenting bacteria and acetogenic bacteria during VFAs production. Homoacetogenesis also plays a role in the syntrophic system by converting H2 and CO2 to acetate. Potential applications of these syntrophic activities in bioelectrochemical system and value-added product recovery from AD of organic wastes are also discussed. The study of acidogenic syntrophic relations is in its early stages, and additional investigation is required to better understand the mechanism of syntrophic relations.
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Affiliation(s)
- Chao Liu
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Liheng Ren
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Binghua Yan
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Lin Luo
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Jiachao Zhang
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Mukesh Kumar Awasthi
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China; Swedish Centre for Resource Recovery, University of Borås, 50190 Borås, Sweden.
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Muturi SM, Muthui LW, Njogu PM, Onguso JM, Wachira FN, Opiyo SO, Pelle R. Metagenomics survey unravels diversity of biogas microbiomes with potential to enhance productivity in Kenya. PLoS One 2021; 16:e0244755. [PMID: 33395690 PMCID: PMC7781671 DOI: 10.1371/journal.pone.0244755] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 12/16/2020] [Indexed: 12/27/2022] Open
Abstract
The obstacle to optimal utilization of biogas technology is poor understanding of biogas microbiomes diversities over a wide geographical coverage. We performed random shotgun sequencing on twelve environmental samples. Randomized complete block design was utilized to assign the twelve treatments to four blocks, within eastern and central regions of Kenya. We obtained 42 million paired-end reads that were annotated against sixteen reference databases using two ENVO ontologies, prior to β-diversity studies. We identified 37 phyla, 65 classes and 132 orders. Bacteria dominated and comprised 28 phyla, 42 classes and 92 orders, conveying substrate's versatility in the treatments. Though, Fungi and Archaea comprised 5 phyla, the Fungi were richer; suggesting the importance of hydrolysis and fermentation in biogas production. High β-diversity within the taxa was largely linked to communities' metabolic capabilities. Clostridiales and Bacteroidales, the most prevalent guilds, metabolize organic macromolecules. The identified Cytophagales, Alteromonadales, Flavobacteriales, Fusobacteriales, Deferribacterales, Elusimicrobiales, Chlamydiales, Synergistales to mention but few, also catabolize macromolecules into smaller substrates to conserve energy. Furthermore, δ-Proteobacteria, Gloeobacteria and Clostridia affiliates syntrophically regulate PH2 and reduce metal to provide reducing equivalents. Methanomicrobiales and other Methanomicrobia species were the most prevalence Archaea, converting formate, CO2(g), acetate and methylated substrates into CH4(g). Thermococci, Thermoplasmata and Thermoprotei were among the sulfur and other metal reducing Archaea that contributed to redox balancing and other metabolism within treatments. Eukaryotes, mainly fungi were the least abundant guild, comprising largely Ascomycota and Basidiomycota species. Chytridiomycetes, Blastocladiomycetes and Mortierellomycetes were among the rare species, suggesting their metabolic and substrates limitations. Generally, we observed that environmental and treatment perturbations influenced communities' abundance, β-diversity and reactor performance largely through stochastic effect. Understanding diversity of biogas microbiomes over wide environmental variables and its' productivity provided insights into better management strategies that ameliorate biochemical limitations to effective biogas production.
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Affiliation(s)
- Samuel Mwangangi Muturi
- Department of Biological Sciences, University of Eldoret, Eldoret, Kenya
- Institute for Bioteschnology Research, Jomo Kenyatta University of Agriculture and Technology, Juja, Kenya
| | - Lucy Wangui Muthui
- Biosciences Eastern and Central Africa—International Livestock Research Institute (BecA-ILRI) Hub, Nairobi, Kenya
| | - Paul Mwangi Njogu
- Institute for Energy and Environmental Technology, Jomo Kenyatta University of Agriculture and Technology, Juja, Kenya
| | - Justus Mong’are Onguso
- Institute for Bioteschnology Research, Jomo Kenyatta University of Agriculture and Technology, Juja, Kenya
| | | | - Stephen Obol Opiyo
- OARDC, Molecular and Cellular Imaging Center-Columbus, Ohio State University, Columbus, Ohio, United States of America
- The University of Sacread Heart, Gulu, Uganda
| | - Roger Pelle
- Biosciences Eastern and Central Africa—International Livestock Research Institute (BecA-ILRI) Hub, Nairobi, Kenya
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12
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Covarrubias-García I, Quijano G, Aizpuru A, Sánchez-García JL, Rodríguez-López JL, Arriaga S. Reduced graphene oxide decorated with magnetite nanoparticles enhance biomethane enrichment. JOURNAL OF HAZARDOUS MATERIALS 2020; 397:122760. [PMID: 32387830 DOI: 10.1016/j.jhazmat.2020.122760] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 04/13/2020] [Accepted: 04/15/2020] [Indexed: 05/14/2023]
Abstract
The addition of magnetite nanoparticles (MNPs), reduced graphene oxide (rGO), and reduced graphene oxide decorated with magnetite nanoparticles (rGO-MNPs) was evaluated during biomethane enrichment process. rGO-MNPs presented the highest beneficial impact on the hydrogenotrophic assays with an improvement of 47 % in CH4 production. The improvement was linked to the increase of the electron shuttling capacity (ESC) by rGO-MNPs addition, which boosted the hydrogenotrophic activity of microorganisms, to the rGO and rGO-MNPs, which served as reservoirs of hydrogen, improving H2 transport from the gas to the liquid phase, and to the iron ions released, which acted as a dietary supply for microorganisms. Raman and XRD confirmed a greater disorder and lower crystallinity of rGO-MNPs after the hydrogenotrophic assays, with a lower effect at a nanoparticle concentration of 50 mg/L. Moreover, FTIR analysis indicated that rGO-MNPs were oxidized during the hydrogenotrophic tests. This study highlights the advantages of adding rGO-MNPs as a magnetic nanocomposite. Furthermore, rGO-MNPs can be easily recovered, minimizing their release to the environment.
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Affiliation(s)
- Itzel Covarrubias-García
- División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica, Camino Presa San José 2055, Lomas 4a Sección, CP 78216, San Luis Potosí, Mexico; División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica, Camino Presa San José 2055, Lomas 4a Sección, CP 78216, San Luis Potosí, Mexico
| | - Guillermo Quijano
- Laboratory for Research on Advanced Processes for Water Treatment, Instituto de Ingeniería, Unidad Académica Juriquilla, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro, CP 76230, Mexico
| | - Aitor Aizpuru
- Universidad del Mar, Campus Puerto Ángel, San Pedro Pochutla, CP 70902, Oaxaca, Mexico
| | - José Luis Sánchez-García
- CIEP-Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava #6, San Luis Potosí, CP 78210, Mexico
| | - José Luis Rodríguez-López
- División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica, Camino Presa San José 2055, Lomas 4a Sección, CP 78216, San Luis Potosí, Mexico.
| | - Sonia Arriaga
- División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica, Camino Presa San José 2055, Lomas 4a Sección, CP 78216, San Luis Potosí, Mexico.
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13
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Zhu X, Zhou P, Chen Y, Liu X, Li D. The role of endogenous and exogenous hydrogen in the microbiology of biogas production systems. World J Microbiol Biotechnol 2020; 36:79. [DOI: 10.1007/s11274-020-02856-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2020] [Accepted: 05/15/2020] [Indexed: 01/06/2023]
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14
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Ozbayram EG, Kleinsteuber S, Nikolausz M. Biotechnological utilization of animal gut microbiota for valorization of lignocellulosic biomass. Appl Microbiol Biotechnol 2019; 104:489-508. [DOI: 10.1007/s00253-019-10239-w] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 10/25/2019] [Accepted: 11/04/2019] [Indexed: 10/25/2022]
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15
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Chowdhury B, Lin L, Dhar BR, Islam MN, McCartney D, Kumar A. Enhanced biomethane recovery from fat, oil, and grease through co-digestion with food waste and addition of conductive materials. CHEMOSPHERE 2019; 236:124362. [PMID: 31323554 DOI: 10.1016/j.chemosphere.2019.124362] [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: 04/16/2019] [Revised: 06/25/2019] [Accepted: 07/12/2019] [Indexed: 06/10/2023]
Abstract
In this study, the effect of conductive additives on co-digestion of fat, oil, and grease (FOG) and food waste (FW) was evaluated. Initially, biochemical methane potential (BMP) test was conducted for optimization of mixing ratio of FW and FOG. The optimal methane production (800 L (kg VS)-1) was obtained from co-digestion of 70% FW + 30% FOG (w/w), which was 1.2 times and 12 times of that obtained from mono-digestion of FW and FOG, respectively. This optimal mixing ratio was used for subsequent fed-batch studies with the addition of two conductive additives, granular activated carbon (GAC) and magnetite. The addition of GAC significantly shortened the lag phase (from 7 to 3 d), reduced accumulation of various volatile fatty acids (VFAs), and enhanced methane production rate (50-80% increase) compared to the control and magnetite-amended bioreactor. Fourier transformation infrared (FTIR) analysis suggested that the degradation of lipids, protein and carbohydrates was the highest in GAC amended reactor, followed by magnetite and control reactors. GAC addition also enriched more abundant and diverse bacteria and methanogens than control. Magnetite addition also showed similar trends but to a lesser degree. The substantial enrichment of syntrophic LCFA β-oxidizing bacteria (e.g. Syntrophomonas) and methanogenic archaea in the GAC-amended bioreactor likely attributed to the superior methanogenesis kinetics in GAC amended bioreactor. Our findings suggest that the addition of GAC could provide a sustainable strategy to enrich kinetically efficient syntrophic microbiome to favor methanogenesis kinetics in co-digestion of FW and FOG.
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Affiliation(s)
- Bappi Chowdhury
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Long Lin
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Bipro Ranjan Dhar
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada.
| | | | - Daryl McCartney
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Amit Kumar
- Department of Mechanical Engineering, University of Alberta, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
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16
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Rusmanis D, O’Shea R, Wall DM, Murphy JD. Biological hydrogen methanation systems - an overview of design and efficiency. Bioengineered 2019; 10:604-634. [PMID: 31679461 PMCID: PMC6844437 DOI: 10.1080/21655979.2019.1684607] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 10/17/2019] [Accepted: 10/17/2019] [Indexed: 11/17/2022] Open
Abstract
The rise in intermittent renewable electricity production presents a global requirement for energy storage. Biological hydrogen methanation (BHM) facilitates wind and solar energy through the storage of otherwise curtailed or constrained electricity in the form of the gaseous energy vector biomethane. Biological methanation in the circular economy involves the reaction of hydrogen - produced during electrolysis - with carbon dioxide in biogas to produce methane (4H2 + CO2 = CH4 + 2H2), typically increasing the methane output of the biogas system by 70%. In this paper, several BHM systems were researched and a compilation of such systems was synthesized, facilitating comparison of key parameters such as methane evolution rate (MER) and retention time. Increased retention times were suggested to be related to less efficient systems with long travel paths for gases through reactors. A significant lack of information on gas-liquid transfer co-efficient was identified.
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Affiliation(s)
- Davis Rusmanis
- MaREI Centre, Environmental Research Institute (ERI), University College Cork (UCC), Cork, Ireland
- School of Engineering, UCC, Cork, Ireland
| | - Richard O’Shea
- MaREI Centre, Environmental Research Institute (ERI), University College Cork (UCC), Cork, Ireland
- School of Engineering, UCC, Cork, Ireland
| | - David M. Wall
- MaREI Centre, Environmental Research Institute (ERI), University College Cork (UCC), Cork, Ireland
- School of Engineering, UCC, Cork, Ireland
| | - Jerry D. Murphy
- MaREI Centre, Environmental Research Institute (ERI), University College Cork (UCC), Cork, Ireland
- School of Engineering, UCC, Cork, Ireland
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17
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Li H, Mei X, Liu B, Li Z, Wang B, Ren N, Xing D. Insights on acetate-ethanol fermentation by hydrogen-producing Ethanoligenens under acetic acid accumulation based on quantitative proteomics. ENVIRONMENT INTERNATIONAL 2019; 129:1-9. [PMID: 31085357 DOI: 10.1016/j.envint.2019.05.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Revised: 04/29/2019] [Accepted: 05/06/2019] [Indexed: 06/09/2023]
Abstract
Ethanoligenens, a novel ethanologenic hydrogen-producing genus, is a representative fermenter in its unique acetate-ethanol fermentation and physiology. Acetic acid accumulation is one of major factors that affect H2-ethanol co-production. However, sufficient information is unavailable on the tolerance mechanisms of hydrogen-producing bacterium in acetic acid stress. The fermentation process of Ethanoligenens harbinense YUAN-3 was significantly slowed down in the selection stress of exogenous acetic acid. The maximum gas production rate of strain YUAN-3 decreased from 192.15 mL·(L-culture)-1·h-1 to 75.2 mL·(L-culture)-1·h-1 with increasing exogenous acetic acid from 0 mM to 30 mM, the batch fermentation period was correspondingly expanded from 66 h to 136 h. Through iTRAQ-based quantitative proteomic approach, 78, 121 and 216 proteins were differentially expressed after strain YUAN-3 was cultured in the medium supplemented with exogenous acetic acid of 10 mM, 20 mM and 30 mM. The up-regulated proteins were mainly involved in β-alanine and pyrimidine metabolism, oxidative stress response, while the down-regulated proteins mainly participated in phosphotransferase system (PTS), fructose and mannose metabolism, phosphate uptake, ribosome, and flagellar assembly. These proteins help to maintain balance between fermentation process and alleviation of intracellular acidification in strain YUAN-3. The study indicated that response to acetic acid stress in strain YUAN-3 was a complex process, which involved multiple metabolic pathways. Reductive pyrimidine catabolic pathway played an important role in the acetic acid resistance of E. harbinense.
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Affiliation(s)
- Huahua Li
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Xiaoxue Mei
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Bingfeng Liu
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Zhen Li
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Baichen Wang
- Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
| | - Nanqi Ren
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Defeng Xing
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
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18
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Luo L, Kaur G, Wong JWC. A mini-review on the metabolic pathways of food waste two-phase anaerobic digestion system. WASTE MANAGEMENT & RESEARCH : THE JOURNAL OF THE INTERNATIONAL SOLID WASTES AND PUBLIC CLEANSING ASSOCIATION, ISWA 2019; 37:333-346. [PMID: 30696377 DOI: 10.1177/0734242x18819954] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Food waste (FW) disposal has become a global social, environmental, and economic problem. The current practice of landfilling is undesirable due to its potential emission of greenhouse gas, nutrient recycling, and pollution of water resources. Anaerobic digestion (AD), particularly two-phase AD is a promising option to manage FW and recover energy in the form of methane and obtain value-added by-products. However, most current review literature focuses on operating conditions while often placing little emphasis on improving conversion efficiency through regulating intermediate products. The AD process involves complex metabolic reactions carried out by several microbial groups. Therefore, understanding of these metabolic pathways existing in AD is the key to design effective strategies for enrichment of specific microbial groups which can produce desired intermediates for methane production, which can possibly be achieved by an understanding of the influence of critical process parameters on these metabolic pathways. Thus, it is the aim of this review to describe the effect of process conditions on underlying metabolic pathways in order to allow an efficient manipulation of these pathways for enhancing methane production.
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Affiliation(s)
- Liwen Luo
- Sino-Forest Applied Research Centre for Pearl River Delta Environment and Department of Biology, Hong Kong Baptist University, Hong Kong SAR, Hong Kong
| | - Guneet Kaur
- Sino-Forest Applied Research Centre for Pearl River Delta Environment and Department of Biology, Hong Kong Baptist University, Hong Kong SAR, Hong Kong
| | - Jonathan W C Wong
- Sino-Forest Applied Research Centre for Pearl River Delta Environment and Department of Biology, Hong Kong Baptist University, Hong Kong SAR, Hong Kong
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19
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De Vrieze J, Arends JBA, Verbeeck K, Gildemyn S, Rabaey K. Interfacing anaerobic digestion with (bio)electrochemical systems: Potentials and challenges. WATER RESEARCH 2018; 146:244-255. [PMID: 30273809 DOI: 10.1016/j.watres.2018.08.045] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 08/14/2018] [Accepted: 08/17/2018] [Indexed: 06/08/2023]
Abstract
For over a century, anaerobic digestion has been a key technology in stabilizing organic waste streams, while at the same time enabling the recovery of energy. The anticipated transition to a bio-based economy will only increase the quantity and diversity of organic waste streams to be treated, and, at the same time, increase the demand for additional and effective resource recovery schemes for nutrients and organic matter. The performance of anaerobic digestion can be supported and enhanced by (bio)electrochemical systems in a wide variety of hybrid technologies. Here, the possible benefits of combining anaerobic digestion with (bio)electrochemical systems were reviewed in terms of (1) process monitoring, control, and stabilization, (2) nutrient recovery, (3) effluent polishing, and (4) biogas upgrading. The interaction between microorganisms and electrodes with respect to niche creation is discussed, and the potential impact of this interaction on process performance is evaluated. The strength of combining anaerobic digestion with (bio)electrochemical technologies resides in the complementary character of both technologies, and this perspective was used to distinguish transient trends from schemes with potential for full-scale application. This is supported by an operational costs assessment, showing that the economic potential of combining anaerobic digestion with a (bio)electrochemical system is highly case-specific, and strongly depends on engineering challenges with respect to full-scale applications.
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Affiliation(s)
- Jo De Vrieze
- Center for Microbial Ecology & Technology (CMET), Ghent University, Coupure Links 653, B-9000, Gent, Belgium
| | - Jan B A Arends
- Center for Microbial Ecology & Technology (CMET), Ghent University, Coupure Links 653, B-9000, Gent, Belgium
| | - Kristof Verbeeck
- Center for Microbial Ecology & Technology (CMET), Ghent University, Coupure Links 653, B-9000, Gent, Belgium
| | - Sylvia Gildemyn
- Center for Microbial Ecology & Technology (CMET), Ghent University, Coupure Links 653, B-9000, Gent, Belgium; OWS nv, Dok Noord 5, 9000, Gent, Belgium
| | - Korneel Rabaey
- Center for Microbial Ecology & Technology (CMET), Ghent University, Coupure Links 653, B-9000, Gent, Belgium.
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20
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Biohydrogen Production from Food Waste: Influence of the Inoculum-To-Substrate Ratio. SUSTAINABILITY 2018. [DOI: 10.3390/su10124506] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
In this study, the influence of the inoculum-to-substrate ratio (ISR) on dark fermentative hydrogen production from food waste (FW) was evaluated. ISR values ranging from 0.05 to 0.25 g VSinoculum/g VSsubstrate were investigated by performing batch tests at T = 39 °C and pH = 6.5, the latter being the optimal value identified based on a previous study. The ISR was found to affect the fermentation process, clearly showing that an adequate ISR is essential in order to optimise the process kinetics and the H2 yield. An ISR of 0.14 proved to optimum, leading to a maximum H2 yield of 88.8 L H2/kg VSFW and a maximum production rate of 10.8 L H2/kg VSFW∙h. The analysis of the fermentation products indicated that the observed highest H2 production mostly derived from the typical acetate/butyrate-type fermentation.
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21
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Wirth R, Kádár G, Kakuk B, Maróti G, Bagi Z, Szilágyi Á, Rákhely G, Horváth J, Kovács KL. The Planktonic Core Microbiome and Core Functions in the Cattle Rumen by Next Generation Sequencing. Front Microbiol 2018; 9:2285. [PMID: 30319585 PMCID: PMC6165872 DOI: 10.3389/fmicb.2018.02285] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 09/07/2018] [Indexed: 12/31/2022] Open
Abstract
The cow rumen harbors a great variety of diverse microbes, which form a complex, organized community. Understanding the behavior of this multifarious network is crucial in improving ruminant nutrient use efficiency. The aim of this study was to expand our knowledge by examining 10 Holstein dairy cow rumen fluid fraction whole metagenome and transcriptome datasets. DNA and mRNA sequence data, generated by Ion Torrent, was subjected to quality control and filtering before analysis for core elements. The taxonomic core microbiome consisted of 48 genera belonging to Bacteria (47) and Archaea (1). The genus Prevotella predominated the planktonic core community. Core functional groups were identified using co-occurrence analysis and resulted in 587 genes, from which 62 could be assigned to metabolic functions. Although this was a minimal functional core, it revealed key enzymes participating in various metabolic processes. A diverse and rich collection of enzymes involved in carbohydrate metabolism and other functions were identified. Transcripts coding for enzymes active in methanogenesis made up 1% of the core functions. The genera associated with the core enzyme functions were also identified. Linking genera to functions showed that the main metabolic pathways are primarily provided by Bacteria and several genera may serve as a “back-up” team for the central functions. The key actors in most essential metabolic routes belong to the genus Prevotella. Confirming earlier studies, the genus Methanobrevibacter carries out the overwhelming majority of rumen methanogenesis and therefore methane emission mitigation seems conceivable via targeting the hydrogenotrophic methanogenesis.
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Affiliation(s)
- Roland Wirth
- Department of Biotechnology, University of Szeged, Szeged, Hungary
| | | | - Balázs Kakuk
- Department of Biotechnology, University of Szeged, Szeged, Hungary
| | - Gergely Maróti
- Institute of Plant Biology, Biological Research Center, Hungarian Academy of Sciences, Szeged, Hungary
| | - Zoltán Bagi
- Department of Biotechnology, University of Szeged, Szeged, Hungary
| | - Árpád Szilágyi
- Department of Biotechnology, University of Szeged, Szeged, Hungary
| | - Gábor Rákhely
- Department of Biotechnology, University of Szeged, Szeged, Hungary.,Institute of Biophysics, Biological Research Center, Hungarian Academy of Sciences, Szeged, Hungary
| | - József Horváth
- Faculty of Agriculture, University of Szeged, Hódmezövásárhely, Hungary
| | - Kornél L Kovács
- Department of Biotechnology, University of Szeged, Szeged, Hungary.,Institute of Biophysics, Biological Research Center, Hungarian Academy of Sciences, Szeged, Hungary.,Department of Oral Biology and Experimental Dental Research, University of Szeged, Szeged, Hungary
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22
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Wang Y, Yin C, Liu Y, Tan M, Shimizu K, Lei Z, Zhang Z, Sumi I, Yao Y, Mogi Y. Biomethanation of blast furnace gas using anaerobic granular sludge via addition of hydrogen. RSC Adv 2018; 8:26399-26406. [PMID: 35541962 PMCID: PMC9083107 DOI: 10.1039/c8ra04853c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 07/17/2018] [Indexed: 11/26/2022] Open
Abstract
The high concentrations of CO (toxic) and CO2 (greenhouse gases) in blast furnace gas (a by-product of steelworks) reflect its low calorific value. In this study, anaerobic granular sludge was used to convert carbon from blast furnace gas to methane via exogenous hydrogen addition. The inhibition of methane production by CO partial pressure (P CO) was found to start from 0.4 atm. The intermediate metabolites from CO to methane including acetate, propionate, and H2 accumulated at higher CO concentrations in the presence of 2-bromoethanesulfonic acid. After the introduction of H2 and blast furnace gas, although the hydrogen partial pressure (P H2 ) up to 1.54 atm resulted in the maximum CH4 yield, the whole system was not stable due to the accumulation of a large amount of volatile fatty acids. The optimum P H2 on CH4 production from the simulated blast furnace gas, 5.32 mmol g-1 VSS, was determined at 0.88 atm in this study.
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Affiliation(s)
- Ying Wang
- Graduate School of Life and Environmental Sciences, University of Tsukuba 1-1-1, Tennodai Tsukuba Ibaraki 3058572 Japan +81 29 853 4712 +81 29 853 4712
| | - Chenzhu Yin
- Graduate School of Life and Environmental Sciences, University of Tsukuba 1-1-1, Tennodai Tsukuba Ibaraki 3058572 Japan +81 29 853 4712 +81 29 853 4712
| | - Ye Liu
- Graduate School of Life and Environmental Sciences, University of Tsukuba 1-1-1, Tennodai Tsukuba Ibaraki 3058572 Japan +81 29 853 4712 +81 29 853 4712
| | - Mengjiao Tan
- Graduate School of Life and Environmental Sciences, University of Tsukuba 1-1-1, Tennodai Tsukuba Ibaraki 3058572 Japan +81 29 853 4712 +81 29 853 4712
| | - Kazuya Shimizu
- Graduate School of Life and Environmental Sciences, University of Tsukuba 1-1-1, Tennodai Tsukuba Ibaraki 3058572 Japan +81 29 853 4712 +81 29 853 4712
| | - Zhongfang Lei
- Graduate School of Life and Environmental Sciences, University of Tsukuba 1-1-1, Tennodai Tsukuba Ibaraki 3058572 Japan +81 29 853 4712 +81 29 853 4712
| | - Zhenya Zhang
- Graduate School of Life and Environmental Sciences, University of Tsukuba 1-1-1, Tennodai Tsukuba Ibaraki 3058572 Japan +81 29 853 4712 +81 29 853 4712
| | - Ikuhiro Sumi
- JFE Steel Cooperation 1, Kawasaki-cho Chuo-ku Chiba 2600835 Japan
| | - Yasuko Yao
- JFE Techno-Research Cooperation 2-7-1 Otemachi Chiyoda-ku Tokyo 1000004 Japan
| | - Yasuhiro Mogi
- JFE Steel Cooperation 1, Kawasaki-cho Chuo-ku Chiba 2600835 Japan
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23
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Effect of endogenous hydrogen utilization on improved methane production in an integrated microbial electrolysis cell and anaerobic digestion: Employing catalyzed stainless steel mesh cathode. Chin J Chem Eng 2018. [DOI: 10.1016/j.cjche.2017.08.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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24
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Zhou M, Yan B, Wong JWC, Zhang Y. Enhanced volatile fatty acids production from anaerobic fermentation of food waste: A mini-review focusing on acidogenic metabolic pathways. BIORESOURCE TECHNOLOGY 2018; 248:68-78. [PMID: 28693950 DOI: 10.1016/j.biortech.2017.06.121] [Citation(s) in RCA: 265] [Impact Index Per Article: 44.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Revised: 06/21/2017] [Accepted: 06/22/2017] [Indexed: 05/11/2023]
Abstract
Recently, efficient disposal of food waste (FW) with potential resource recovery has attracted great attentions. Due to its easily biodegradable nature, rich nutrient availability and high moisture content, FW is regarded as favorable substrate for anaerobic digestion (AD). Both waste disposal and energy recovery can be fulfilled during AD of FW. Volatile fatty acids (VFAs) which are the products of the first-two stages of AD, are widely applied in chemical industry as platform chemicals recently. Concentration and distribution of VFAs is the result of acidogenic metabolic pathways, which can be affected by the micro-environment (e.g. pH) in the digester. Hence, the clear elucidation of the acidogenic metabolic pathways is essential for optimization of acidogenic process for efficient product recovery. This review summarizes major acidogenic metabolic pathways and regulating strategies for enhancing VFAs recovery during acidogenic fermentation of FW.
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Affiliation(s)
- Miaomiao Zhou
- Lab of Waste Valorization and Water Reuse, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 189 Songling Road, Laoshan District, Qingdao 266101, PR China; University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, PR China
| | - Binghua Yan
- Lab of Waste Valorization and Water Reuse, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 189 Songling Road, Laoshan District, Qingdao 266101, PR China.
| | - Jonathan W C Wong
- Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, PR China
| | - Yang Zhang
- Lab of Waste Valorization and Water Reuse, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 189 Songling Road, Laoshan District, Qingdao 266101, PR China
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25
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Zabranska J, Pokorna D. Bioconversion of carbon dioxide to methane using hydrogen and hydrogenotrophic methanogens. Biotechnol Adv 2017; 36:707-720. [PMID: 29248685 DOI: 10.1016/j.biotechadv.2017.12.003] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 11/14/2017] [Accepted: 12/12/2017] [Indexed: 11/18/2022]
Abstract
Biogas produced from organic wastes contains energetically usable methane and unavoidable amount of carbon dioxide. The exploitation of whole biogas energy is locally limited and utilization of the natural gas transport system requires CO2 removal or its conversion to methane. The biological conversion of CO2 and hydrogen to methane is well known reaction without the demand of high pressure and temperature and is carried out by hydrogenotrophic methanogens. Reducing equivalents to the biotransformation of carbon dioxide from biogas or other resources to biomethane can be supplied by external hydrogen. Discontinuous electricity production from wind and solar energy combined with fluctuating utilization cause serious storage problems that can be solved by power-to-gas strategy representing the production of storable hydrogen via the electrolysis of water. The possibility of subsequent repowering of the energy of hydrogen to the easily utilizable and transportable form is a biological conversion with CO2 to biomethane. Biomethanization of CO2 can take place directly in anaerobic digesters fed with organic substrates or in separate bioreactors. The major bottleneck in the process is gas-liquid mass transfer of H2 and the method of the effective input of hydrogen into the system. There are many studies with different bioreactors arrangements and a way of enrichment of hydrogenotrophic methanogens, but the system still has to be optimized for a higher efficiency. The aim of the paper is to gather and critically assess the state of a research and experience from laboratory, pilot and operational applications of carbon dioxide bioconversion and highlight further perspective fields of research.
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Affiliation(s)
- Jana Zabranska
- University of Chemistry and Technology Prague, Department of Water Technology and Environmental Engineering, Technicka 5, CZ 166 28 Prague, Czech Republic.
| | - Dana Pokorna
- University of Chemistry and Technology Prague, Department of Water Technology and Environmental Engineering, Technicka 5, CZ 166 28 Prague, Czech Republic
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26
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Girotto F, Lavagnolo MC, Pivato A, Cossu R. Acidogenic fermentation of the organic fraction of municipal solid waste and cheese whey for bio-plastic precursors recovery - Effects of process conditions during batch tests. WASTE MANAGEMENT (NEW YORK, N.Y.) 2017; 70:71-80. [PMID: 28943079 DOI: 10.1016/j.wasman.2017.09.015] [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: 07/19/2017] [Revised: 09/11/2017] [Accepted: 09/13/2017] [Indexed: 06/07/2023]
Abstract
The problem of fossil fuels dependency is being addressed through sustainable bio-fuels and bio-products production worldwide. At the base of this bio-based economy there is the efficient use of biomass as non-virgin feedstock. Through acidogenic fermentation, organic waste can be valorised in order to obtain several precursors to be used for bio-plastic production. Some investigations have been done but there is still a lack of knowledge that must be filled before moving to effective full scale plants. Acidogenic fermentation batch tests were performed using food waste (FW) and cheese whey (CW) as substrates. Effects of nine different combinations of substrate to inoculum (S/I) ratio (2, 4, and 6) and initial pH (5, 7, and 9) were investigated for metabolites (acetate, butyrate, propionate, valerate, lactate, and ethanol) productions. Results showed that the most abundant metabolites deriving from FW fermentation were butyrate and acetate, mainly influenced by the S/I ratio (acetate and butyrate maximum productions of 21.4 and 34.5g/L, respectively, at S/I=6). Instead, when dealing with CW, lactate was the dominant metabolite significantly correlated with pH (lactate maximum production of 15.7g/L at pH = 9).
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Affiliation(s)
- Francesca Girotto
- Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
| | | | - Alberto Pivato
- Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy
| | - Raffaello Cossu
- Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy
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27
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Karthikeyan R, Cheng KY, Selvam A, Bose A, Wong JW. Bioelectrohydrogenesis and inhibition of methanogenic activity in microbial electrolysis cells - A review. Biotechnol Adv 2017; 35:758-771. [DOI: 10.1016/j.biotechadv.2017.07.004] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 06/08/2017] [Accepted: 07/08/2017] [Indexed: 10/19/2022]
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28
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Valuable biochemical production in mixed culture fermentation: fundamentals and process coupling. Appl Microbiol Biotechnol 2017; 101:6575-6586. [DOI: 10.1007/s00253-017-8441-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Revised: 07/18/2017] [Accepted: 07/19/2017] [Indexed: 01/20/2023]
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29
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30
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Guneratnam AJ, Ahern E, FitzGerald JA, Jackson SA, Xia A, Dobson ADW, Murphy JD. Study of the performance of a thermophilic biological methanation system. BIORESOURCE TECHNOLOGY 2017; 225:308-315. [PMID: 27898322 DOI: 10.1016/j.biortech.2016.11.066] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 11/15/2016] [Accepted: 11/16/2016] [Indexed: 05/07/2023]
Abstract
This study investigated the operation of ex-situ biological methanation at two thermophilic temperatures (55°C and 65°C). Methane composition of 85-88% was obtained and volumetric productivities of 0.45 and 0.4LCH4/Lreactor were observed at 55°C and 65°C after 24h respectively. It is postulated that at 55°C the process operated as a mixed culture as the residual organic substrates in the starting inoculum were still available. These were consumed prior to the assessment at 65°C; thus the methanogens were now dependent on gaseous substrates CO2 and H2. The experiment was repeated at 65°C with fresh inoculum (a mixed culture); methane composition and volumetric productivity of 92% and 0.46LCH4/Lreactor were achieved in 24h. Methanothermobacter species represent likely and resilient candidates for thermophilic biogas upgrading.
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Affiliation(s)
| | - Eoin Ahern
- The MaREI Centre, Environmental Research Institute, University College Cork, Ireland
| | - Jamie A FitzGerald
- The MaREI Centre, Environmental Research Institute, University College Cork, Ireland; School of Microbiology, University College Cork, Ireland
| | | | - Ao Xia
- Key Laboratory of Low-grade Energy Utilisation Technologies and Systems, Chongqing University, Chongqing 400044, China
| | | | - Jerry D Murphy
- The MaREI Centre, Environmental Research Institute, University College Cork, Ireland; School of Engineering, University College Cork, Ireland.
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31
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Wang H, Zhang Y, Angelidaki I. Ammonia inhibition on hydrogen enriched anaerobic digestion of manure under mesophilic and thermophilic conditions. WATER RESEARCH 2016; 105:314-319. [PMID: 27639056 DOI: 10.1016/j.watres.2016.09.006] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Revised: 09/06/2016] [Accepted: 09/06/2016] [Indexed: 06/06/2023]
Abstract
Capturing of carbon dioxide by hydrogen derived from excess renewable energy (e.g., wind mills) to methane in a microbially catalyzed process offers an attractive technology for biogas production and upgrading. This bioconversion process is catalyzed by hydrogenotrophic methanogens, which are known to be sensitive to ammonia. In this study, the tolerance of the biogas process under supply of hydrogen, to ammonia toxicity was studied under mesophilic and thermophilic conditions. When the initial hydrogen partial pressure was 0.5 atm, the methane yield at high ammonia load (7 g NH4+-N L-1) was 41.0% and 22.3% lower than that at low ammonia load (1 g NH4+-N L-1) in mesophilic and thermophilic condition, respectively. Meanwhile no significant effect on the biogas composition was observed. Moreover, we found that hydrogentrophic methanogens were more tolerant to the ammonia toxicity than acetoclastic methanogens in the hydrogen enriched biogas production and upgrading processes. The highest methane production yield was achieved under 0.5 atm hydrogen partial pressure in batch reactors at all the tested ammonia levels. Furthermore, the thermophilic methanogens at 0.5 atm of hydrogen partial pressure were more tolerant to high ammonia levels (≥5 g NH4+-N L-1), compared with mesophilic methanogens. The present study offers insight in developing resistant hydrogen enriched biogas production and upgrading processes treating ammonia-rich waste streams.
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Affiliation(s)
- Han Wang
- Department of Environmental Engineering, Technical University of Denmark, Miljoevej B113, DK 2800, Kgs Lyngby, Denmark
| | - Yifeng Zhang
- Department of Environmental Engineering, Technical University of Denmark, Miljoevej B113, DK 2800, Kgs Lyngby, Denmark.
| | - Irini Angelidaki
- Department of Environmental Engineering, Technical University of Denmark, Miljoevej B113, DK 2800, Kgs Lyngby, Denmark
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32
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Kim TW, Bae SS, Lee JW, Lee SM, Lee JH, Lee HS, Kang SG. A biological process effective for the conversion of CO-containing industrial waste gas to acetate. BIORESOURCE TECHNOLOGY 2016; 211:792-6. [PMID: 27106591 DOI: 10.1016/j.biortech.2016.04.038] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 04/06/2016] [Accepted: 04/10/2016] [Indexed: 05/28/2023]
Abstract
Acetogens have often been observed to be inhibited by CO above an inhibition threshold concentration. In this study, a two-stage culture consisting of carboxydotrophic archaea and homoacetogenic bacteria is found to be effective in converting industrial waste gas derived from a steel mill process. In the first stage, Thermococcus onnurineus could grow on the Linz-Donawitz converter gas (LDG) containing ca. 56% CO as a sole energy source, converting the CO into H2 and CO2. Then, in the second stage, Thermoanaerobacter kivui could grow on the off-gas from the first stage culture, consuming the H2 and CO in the off-gas completely and producing acetate as a main product. T. kivui alone could not grow on the LDG gas. This work represents the first demonstration of acetate production using steel mill waste gas by a two-stage culture of carboxydotrophic hydrogenogenic microbes and homoacetogenic bacteria.
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Affiliation(s)
- Tae Wan Kim
- Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea; Department of Marine Biotechnology, University of Science and Technology, Daejeon, Republic of Korea
| | - Seung Seob Bae
- Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea; Department of Marine Biotechnology, University of Science and Technology, Daejeon, Republic of Korea
| | - Jin Woo Lee
- Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea; Department of Microbiology, Chungbuk National University, Republic of Korea
| | - Sung-Mok Lee
- Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea
| | - Jung-Hyun Lee
- Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea; Department of Marine Biotechnology, University of Science and Technology, Daejeon, Republic of Korea
| | - Hyun Sook Lee
- Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea; Department of Marine Biotechnology, University of Science and Technology, Daejeon, Republic of Korea.
| | - Sung Gyun Kang
- Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea; Department of Marine Biotechnology, University of Science and Technology, Daejeon, Republic of Korea.
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33
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Li L, He Q, Ma Y, Wang X, Peng X. A mesophilic anaerobic digester for treating food waste: process stability and microbial community analysis using pyrosequencing. Microb Cell Fact 2016; 15:65. [PMID: 27112950 PMCID: PMC4845381 DOI: 10.1186/s12934-016-0466-y] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 04/13/2016] [Indexed: 11/30/2022] Open
Abstract
Background Anaerobic digesters become unstable when operated at a high organi c loading rate (OLR). Investigating the microbial community response to OLR disturbance is helpful for achieving efficient and stable process operation. However, previous studies have only focused on community succession during different process stages. How does community succession influence process stability? Is this kind of succession resilient? Are any key microbial indicator closely related to process stability? Such relationships between microbial communities and process stability are poorly understood. Results In this study, a mesophilic anaerobic digester for treating food waste (FW) was operated to study the microbial diversity and dynamicity due to OLR disturbance. Overloading resulted in proliferation of acidogenic bacteria, and the resulting high volatile fatty acid (VFA) yield triggered an abundance of acetogenic bacteria. However, the abundance and metabolic efficiency of hydrogenotrophic methanogens decreased after disturbance, and as a consequence, methanogens and acetogenic bacteria could not efficiently complete the syntrophy. This stress induced the proliferation of homoacetogens as alternative hydrogenotrophs for converting excessive H2 to acetate. However, the susceptible Methanothrix species also failed to degrade the excessive acetate. This metabolic imbalance finally led to process deterioration. After process recovery, the digester gradually returned to its original operational conditions, reached close to its original performance, and the microbial community profile achieved a new steady-state. Interestingly, the abundance of Syntrophomonas and Treponema increased during the deteriorative stage and rebounded after disturbance, suggesting they were resilient groups. Conclusions Acidogenic bacteria showed high functional redundancy, rapidly adapted to the increased OLR, and shaped new microbial community profiles. The genera Syntrophomonas and Treponema were resilient groups. This observation provides insight into the key microbial indicator that are closely related to process stability. Moreover, the succession of methanogens during the disturbance phase was unsuitable for the metabolic function needed at high OLR. This contradiction resulted in process deterioration. Thus, methanogenesis is the main step that interferes with the stable operation of digesters at high OLR. Further studies on identifying and breeding high-efficiency methanogens may be helpful for breaking the technical bottleneck of process instability and achieving stable operation under high OLR.
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Affiliation(s)
- Lei Li
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Qin He
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Yao Ma
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Xiaoming Wang
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Xuya Peng
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China.
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34
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Hari AR, Katuri KP, Gorron E, Logan BE, Saikaly PE. Multiple paths of electron flow to current in microbial electrolysis cells fed with low and high concentrations of propionate. Appl Microbiol Biotechnol 2016; 100:5999-6011. [PMID: 26936773 DOI: 10.1007/s00253-016-7402-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 02/14/2016] [Accepted: 02/16/2016] [Indexed: 11/25/2022]
Abstract
Microbial electrolysis cells (MECs) provide a viable approach for bioenergy generation from fermentable substrates such as propionate. However, the paths of electron flow during propionate oxidation in the anode of MECs are unknown. Here, the paths of electron flow involved in propionate oxidation in the anode of two-chambered MECs were examined at low (4.5 mM) and high (36 mM) propionate concentrations. Electron mass balances and microbial community analysis revealed that multiple paths of electron flow (via acetate/H2 or acetate/formate) to current could occur simultaneously during propionate oxidation regardless of the concentration tested. Current (57-96 %) was the largest electron sink and methane (0-2.3 %) production was relatively unimportant at both concentrations based on electron balances. At a low propionate concentration, reactors supplemented with 2-bromoethanesulfonate had slightly higher coulombic efficiencies than reactors lacking this methanogenesis inhibitor. However, an opposite trend was observed at high propionate concentration, where reactors supplemented with 2-bromoethanesulfonate had a lower coulombic efficiency and there was a greater percentage of electron loss (23.5 %) to undefined sinks compared to reactors without 2-bromoethanesulfonate (11.2 %). Propionate removal efficiencies were 98 % (low propionate concentration) and 78 % (high propionate concentration). Analysis of 16S rRNA gene pyrosequencing revealed the dominance of sequences most similar to Geobacter sulfurreducens PCA and G. sulfurreducens subsp. ethanolicus. Collectively, these results provide new insights on the paths of electron flow during propionate oxidation in the anode of MECs fed with low and high propionate concentrations.
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Affiliation(s)
- Ananda Rao Hari
- Biological and Environmental Sciences and Engineering Division, Water Desalination and Reuse Research Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Krishna P Katuri
- Biological and Environmental Sciences and Engineering Division, Water Desalination and Reuse Research Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Eduardo Gorron
- Biological and Environmental Sciences and Engineering Division, Water Desalination and Reuse Research Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Bruce E Logan
- Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA, USA
| | - Pascal E Saikaly
- Biological and Environmental Sciences and Engineering Division, Water Desalination and Reuse Research Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia.
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35
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Liu Y, Wan J, Han S, Zhang S, Luo G. Selective conversion of carbon monoxide to hydrogen by anaerobic mixed culture. BIORESOURCE TECHNOLOGY 2016; 202:1-7. [PMID: 26692523 DOI: 10.1016/j.biortech.2015.11.071] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Revised: 11/22/2015] [Accepted: 11/24/2015] [Indexed: 05/28/2023]
Abstract
A new method for the conversion of CO to H2 was developed by anaerobic mixed culture in the current study. Higher CO consumption rate was obtained by anaerobic granular sludge (AGS) compared to waste activated sludge (WAS) at 55 °C and pH 7.5. However, H2 was the intermediate and CH4 was the final product. Fermentation at pH 5.5 by AGS inhibited CH4 production, while the lower CO consumption rate (50% of that at pH 7.5) and the production of acetate were found. Fermentation at pH 7.5 with the addition of chloroform achieved efficient and selective conversion of CO to H2. Stable and efficient H2 production was achieved in a continuous reactor inoculated with AGS, and gas recirculation was crucial to increase the CO conversion efficiency. Microbial community analysis showed that high abundance (44%) of unclassified sequences and low relative abundance (1%) of known CO-utilizing bacteria Desulfotomaculum were enriched in the reactor.
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Affiliation(s)
- Yafeng Liu
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP(3)), Department of Environmental Science and Engineering, Fudan University, 200433 Shanghai, China; School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 201418 Shanghai, China
| | - Jingjing Wan
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP(3)), Department of Environmental Science and Engineering, Fudan University, 200433 Shanghai, China
| | - Sheng Han
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 201418 Shanghai, China
| | - Shicheng Zhang
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP(3)), Department of Environmental Science and Engineering, Fudan University, 200433 Shanghai, China
| | - Gang Luo
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP(3)), Department of Environmental Science and Engineering, Fudan University, 200433 Shanghai, China.
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36
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Characterization of microbial compositions in a thermophilic chemostat of mixed culture fermentation. Appl Microbiol Biotechnol 2015; 100:1511-1521. [PMID: 26563549 DOI: 10.1007/s00253-015-7130-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Revised: 10/26/2015] [Accepted: 10/29/2015] [Indexed: 10/22/2022]
Abstract
The microbial community compositions of a chemostat enriched in a thermophilic (55 °C) mixed culture fermentation (MCF) for hydrogen production under different operational conditions were revealed in this work by integrating denaturing gradient gel electrophoresis (DGGE), Illumina Miseq high-throughput sequencing, and 16S rRNA clone library sequencing. The results showed that the community structure of the enriched cultures was relatively simple. Clones close to the genera of Thermoanaerobacter and/or Bacillus mainly dominated the bacteria. And homoacetogens and archaea were washed out and not detected even by Illumina Miseq high-throughput sequencing which supported the benefit for hydrogen production. On the other hand, the results revealed that the metabolic shift was clearly associated with the change of dominated bacterial groups. The effects of hydrogen partial pressure (PH2) and pH from 4.0 to 5.5 on the microbial compositions were not notable and Thermoanaerobacter was dominant, thus, the metabolites were also not changed. While Bacillus, Thermoanaerobacter and Propionispora hippei dominated the bacteria communities at neutral pH, or Bacillus and Thermoanaerobacter dominated at high influent glucose concentrations, consequently the main metabolites shifted to acetate, ethanol, propionate, or lactate. Thereby, the effect of microbial composition on the metabolite distribution and shift shall be considered when modeling thermophilic MCF in the future.
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37
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GC/MS method for determining carbon isotope enrichment and concentration of underivatized short-chain fatty acids by direct aqueous solution injection of biogas digester samples. Talanta 2015; 143:56-63. [DOI: 10.1016/j.talanta.2015.04.065] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2014] [Revised: 04/16/2015] [Accepted: 04/21/2015] [Indexed: 11/17/2022]
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38
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Liu C, Li J, Zhang Y, Philip A, Shi E, Chi X, Meng J. Influence of glucose fermentation on CO₂ assimilation to acetate in homoacetogen Blautia coccoides GA-1. J Ind Microbiol Biotechnol 2015; 42:1217-24. [PMID: 26153502 DOI: 10.1007/s10295-015-1646-1] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 06/16/2015] [Indexed: 11/28/2022]
Abstract
Fermentation of glucose influences CO2 assimilation to acetate in homoacetogens. Blautia coccoides was investigated for a better understanding of the metabolic characteristics of homoacetogens in mixotrophic cultures. Batch cultures of the strain with H2/CO2 as a sole carbon source reached an acetate yield of 5.32 g/g dry cell weight after 240 h of incubation. Autotrophic metabolism was inhibited as glucose was added into the culture: the higher the glucose concentration the lower the autotrophic ability of the bacterium. Autotrophy was inhibited by high glucose concentration, probably due to the competition for coenzyme A between the Embden-Meyerhof-Parnas pathway and the Wood-Ljungdahl carbon fixation pathway, the energy (adenosine triphosphate) allocation for synthesis of cell carbon and reduction of CO2, in combination with the low pH caused by the accumulation of acetate.
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Affiliation(s)
- Chong Liu
- School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, China
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39
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Zhang Y, Feng Y, Quan X. Zero-valent iron enhanced methanogenic activity in anaerobic digestion of waste activated sludge after heat and alkali pretreatment. WASTE MANAGEMENT (NEW YORK, N.Y.) 2015; 38:297-302. [PMID: 25681947 DOI: 10.1016/j.wasman.2015.01.036] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 08/10/2014] [Accepted: 01/23/2015] [Indexed: 06/04/2023]
Abstract
Heat or alkali pretreatment is the effective method to improve hydrolysis of waste sludge and then enhance anaerobic sludge digestion. However the pretreatment may inactivate the methanogens in the sludge. In the present work, zero-valent iron (ZVI) was used to enhance the methanogenic activity in anaerobic sludge digester under two methanogens-suppressing conditions, i.e. heat-pretreatment and alkali condition respectively. With the addition of ZVI, the lag time of methane production was shortened, and the methane yield increased by 91.5% compared to the control group. The consumption of VFA was accelerated by ZVI, especially for acetate, indicating that the acetoclastic methanogenesis was enhanced. In the alkali-condition experiment, the hydrogen produced decreased from 27.6 to 18.8 mL when increasing the ZVI dosage from 0 to 10 g/L. Correspondingly, the methane yield increased from 1.9 to 32.2 mL, which meant that the H2-utilizing methanogenes was enriched. These results suggested that the addition of ZVI into anaerobic digestion of sludge after pretreated by the heat or alkali process could efficiently recover the methanogenic activity and increase the methane production and sludge reduction.
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Affiliation(s)
- Yaobin Zhang
- Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering, China.
| | - Yinghong Feng
- Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering, China.
| | - Xie Quan
- Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering, China
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40
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Fe0 enhanced acetification of propionate and granulation of sludge in acidogenic reactor. Appl Microbiol Biotechnol 2015; 99:6083-9. [DOI: 10.1007/s00253-015-6449-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2014] [Revised: 01/27/2015] [Accepted: 01/28/2015] [Indexed: 10/23/2022]
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41
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Xu H, Gong S, Sun Y, Ma H, Zheng M, Wang K. High-rate hydrogenotrophic methanogenesis for biogas upgrading: the role of anaerobic granules. ENVIRONMENTAL TECHNOLOGY 2015; 36:529-537. [PMID: 25347307 DOI: 10.1080/09593330.2014.979886] [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] [Indexed: 06/04/2023]
Abstract
Hydrogenotrophic methanogenesis has been proved to be a feasible biological method for biogas upgrading. To improve its performance, the feasibility of typical anaerobic granules as the inoculum was investigated in both batch and continuous experiments. The results from batch experiments showed that glucose-acclimated granules seemed to perform better than granules acclimated to acidified products (AP, i.e. acetate, propionate and ethanol) in in situ biogas upgrading systems and a slightly higher H2 consumption rate (1.5 mmol H2 g VSS(-1) h(-1)) was obtained for glucose-acclimated granules. For AP-acclimated granules, the inhibition on anaerobic digestion and pH increase (up to 9.55±0.16) took place, and the upgrading performance was adversely affected. In contrast, better performance for AP-acclimated granules was observed in ex situ systems, possibly due to their higher hydrogenotrophic methanogenic activities (HMA). Moreover, when gas-liquid mass transfer limitations were alleviated, the upgrading performance was significantly improved (three-fold) for both glucose-acclimated and AP-acclimated granules. The HMA of anaerobic granules could be further enhanced to improve biogas upgrading performance via continuous cultivation with H2/CO2 as the sole substrate. During the three months' cultivation, secondary granulation and microbial population shift were observed, but anaerobic granules still remained intact and their HMA increased from 0.2 to 0.6 g COD g VSS(-1) d(-1). It indicated that the formation of hydrogenotrophic methanogenic granules, a new type of anaerobic granules specialized for high-rate hydrogenotrophic methanogenesis and biogas upgrading, might be possible. Conclusively, anaerobic granules showed great potential for biogas upgrading.
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Affiliation(s)
- Heng Xu
- a State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , Peoples Republic of China
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42
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Hao J, Wang H. Volatile fatty acids productions by mesophilic and thermophilic sludge fermentation: Biological responses to fermentation temperature. BIORESOURCE TECHNOLOGY 2015; 175:367-73. [PMID: 25459844 DOI: 10.1016/j.biortech.2014.10.106] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 10/19/2014] [Accepted: 10/20/2014] [Indexed: 05/04/2023]
Abstract
The volatile fatty acids (VFAs) productions, as well as hydrolases activities, microbial communities, and homoacetogens, of mesophilic and thermophilic sludge anaerobic fermentation were investigated to reveal the microbial responses to different fermentation temperatures. Thermophilic fermentation led to 10-fold more accumulation of VFAs compared to mesophilic fermentation. α-glucosidase and protease had much higher activities in thermophilic reactor, especially protease. Illumina sequencing manifested that raising fermentation temperature increased the abundances of Clostridiaceae, Microthrixaceae and Thermotogaceae, which could facilitate either hydrolysis or acidification. Real-time PCR analysis demonstrated that under thermophilic condition the relative abundance of homoacetogens increased in batch tests and reached higher level at stable fermentation, whereas under mesophilic condition it only increased slightly in batch tests. Therefore, higher fermentation temperature increased the activities of key hydrolases, raised the proportions of bacteria involved in hydrolysis and acidification, and promoted the relative abundance of homoacetogens, which all resulted in higher VFAs production.
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Affiliation(s)
- Jiuxiao Hao
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Hui Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
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43
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Cappai G, De Gioannis G, Friargiu M, Massi E, Muntoni A, Polettini A, Pomi R, Spiga D. An experimental study on fermentative H₂ production from food waste as affected by pH. WASTE MANAGEMENT (NEW YORK, N.Y.) 2014; 34:1510-1519. [PMID: 24833177 DOI: 10.1016/j.wasman.2014.04.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Revised: 12/25/2013] [Accepted: 04/11/2014] [Indexed: 06/03/2023]
Abstract
Batch dark fermentation experiments were performed on food waste and mixtures of food waste and wastewater activated sludge to evaluate the influence of pH on biological H2 production and compare the process performance with and without inoculum addition. The effect of a preliminary thermal shock treatment of the inoculum was also investigated as a means to harvest the hydrogenogenic biomass. The best performance in terms of both H2 generation potential and process kinetics was observed at pH=6.5 under all experimental conditions (no inoculum, and untreated or thermally treated inoculum added). H2 production from food waste was found to be feasible even without inoculum addition, although thermal pre-treatment of the inoculum notably increased the maximum production and reduced the lag phase duration. The analysis of the fermentation products indicated that the biological hydrogen production could be mainly ascribed to a mixed acetate/butyrate-type fermentation. However, the presence of additional metabolites in the digestate, including propionate and ethanol, also indicated that other metabolic pathways were active during the process, reducing substrate conversion into hydrogen. The plateau in H2 generation was found to mirror the condition at which soluble carbohydrates were depleted. Beyond this condition, homoacetogenesis probably started to play a role in the degradation process.
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Affiliation(s)
- G Cappai
- University of Cagliari, DICAAR - Department of Civil and Environmental Engineering and Architecture, Cagliari, Italy; IGAG - CNR (Environmental Geology and Geoengineering Institute of the National Research Council), Italy
| | - G De Gioannis
- University of Cagliari, DICAAR - Department of Civil and Environmental Engineering and Architecture, Cagliari, Italy; IGAG - CNR (Environmental Geology and Geoengineering Institute of the National Research Council), Italy
| | - M Friargiu
- University of Cagliari, DICAAR - Department of Civil and Environmental Engineering and Architecture, Cagliari, Italy
| | - E Massi
- Department of Civil and Environmental Engineering, University of Rome "La Sapienza", Italy
| | - A Muntoni
- University of Cagliari, DICAAR - Department of Civil and Environmental Engineering and Architecture, Cagliari, Italy; IGAG - CNR (Environmental Geology and Geoengineering Institute of the National Research Council), Italy
| | - A Polettini
- Department of Civil and Environmental Engineering, University of Rome "La Sapienza", Italy
| | - R Pomi
- Department of Civil and Environmental Engineering, University of Rome "La Sapienza", Italy
| | - D Spiga
- University of Cagliari, DICAAR - Department of Civil and Environmental Engineering and Architecture, Cagliari, Italy
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44
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Zhang F, Zhang Y, Ding J, Dai K, van Loosdrecht MCM, Zeng RJ. Stable acetate production in extreme-thermophilic (70°C) mixed culture fermentation by selective enrichment of hydrogenotrophic methanogens. Sci Rep 2014; 4:5268. [PMID: 24920064 PMCID: PMC4053707 DOI: 10.1038/srep05268] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Accepted: 05/20/2014] [Indexed: 11/09/2022] Open
Abstract
The control of metabolite production is difficult in mixed culture fermentation. This is particularly related to hydrogen inhibition. In this work, hydrogenotrophic methanogens were selectively enriched to reduce the hydrogen partial pressure and to realize efficient acetate production in extreme-thermophilic (70°C) mixed culture fermentation. The continuous stirred tank reactor (CSTR) was stable operated during 100 days, in which acetate accounted for more than 90% of metabolites in liquid solutions. The yields of acetate, methane and biomass in CSTR were 1.5 ± 0.06, 1.0 ± 0.13 and 0.4 ± 0.05 mol/mol glucose, respectively, close to the theoretical expected values. The CSTR effluent was stable and no further conversion occurred when incubated for 14 days in a batch reactor. In fed-batch experiments, acetate could be produced up to 34.4 g/L, significantly higher than observed in common hydrogen producing fermentations. Acetate also accounted for more than 90% of soluble products formed in these fed-batch fermentations. The microbial community analysis revealed hydrogenotrophic methanogens (mainly Methanothermobacter thermautotrophicus and Methanobacterium thermoaggregans) as 98% of Archaea, confirming that high temperature will select hydrogenotrophic methanogens over aceticlastic methanogens effectively. This work demonstrated a potential application to effectively produce acetate as a value chemical and methane as an energy gas together via mixed culture fermentation.
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Affiliation(s)
- Fang Zhang
- 1] Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China [2] Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, People's Republic of China
| | - Yan Zhang
- Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Jing Ding
- Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Kun Dai
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, People's Republic of China
| | - Mark C M van Loosdrecht
- Department of Biotechnology, Delft University of Technology, Julianalaan 67, 2628 BC Delft, The Netherlands
| | - Raymond J Zeng
- Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
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Yan BH, Selvam A, Xu SY, Wong JWC. A novel way to utilize hydrogen and carbon dioxide in acidogenic reactor through homoacetogenesis. BIORESOURCE TECHNOLOGY 2014; 159:249-257. [PMID: 24657755 DOI: 10.1016/j.biortech.2014.02.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2013] [Revised: 02/03/2014] [Accepted: 02/05/2014] [Indexed: 06/03/2023]
Abstract
This study investigated the potential of Acetobacterium woodii, a homoacetogen, in co-culture with common acetogens for acetate production during glucose fermentation. Three types of inocula, A. woodii (AW), heat-treated sludge (HTS) and co-culture of A. woodii and heat-treated sludge (AW-HTS) were investigated. Results showed that ∼ 150 mM of glucose was almost completely converted to biomass, gases and other products in co-culture. The addition of A. woodii induced homoacetogenic fermentation in AW-HTS during the first 3 days, as evidenced by the decreased hydrogen production and acetate dominance (>90%, corresponding to 1.19 mol acetate/mol glucose) in total soluble products. However, due to the unfavorable environmental conditions, metabolic pathway in AW-HTS treatment shifted towards butyrate type at the end of the experiment. Bacterial diversity analysis indicated that species supporting growth of A. woodii were dominant during the first several days and their abundance gradually decreased until the end of experiment.
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Affiliation(s)
- Bing Hua Yan
- Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, PR China
| | - Ammaiyappan Selvam
- Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, PR China
| | - Su Yun Xu
- Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, PR China
| | - Jonathan W C Wong
- Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, PR China.
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46
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Feng Y, Zhang Y, Quan X, Chen S. Enhanced anaerobic digestion of waste activated sludge digestion by the addition of zero valent iron. WATER RESEARCH 2014; 52:242-50. [PMID: 24275106 DOI: 10.1016/j.watres.2013.10.072] [Citation(s) in RCA: 284] [Impact Index Per Article: 28.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2013] [Revised: 10/27/2013] [Accepted: 10/31/2013] [Indexed: 05/16/2023]
Abstract
Anaerobic digestion is promising technology to recover energy from waste activated sludge. However, the sludge digestion is limited by its low efficiency of hydrolysis-acidification. Zero valent iron (ZVI) as a reducing material is expected to enhance anaerobic process including the hydrolysis-acidification process. Considering that, ZVI was added into an anaerobic sludge digestion system to accelerate the sludge digestion in this study. The results indicated that ZVI effectively enhanced the decomposition of protein and cellulose, the two main components of the sludge. Compared to the control test without ZVI, the degradation of protein increased 21.9% and the volatile fatty acids production increased 37.3% with adding ZVI. More acetate and less propionate are found during the hydrolysis-acidification with ZVI. The activities of several key enzymes in the hydrolysis and acidification increased 0.6-1 time. ZVI made the methane production raise 43.5% and sludge reduction ratio increase 12.2 percent points. Fluorescence in situ hybridization analysis showed that the abundances of hydrogen-consuming microorganisms including homoacetogens and hydrogenotrophic methanogens with ZVI were higher than the control, which reduced the H2 accumulation to create a beneficial condition for the sludge digestion in thermodynamics.
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Affiliation(s)
- Yinghong Feng
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Yaobin Zhang
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
| | - Xie Quan
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Suo Chen
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
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47
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Zahedi S, Sales D, Romero LI, Solera R. Dark fermentation from real solid waste. Evolution of microbial community. BIORESOURCE TECHNOLOGY 2014; 151:221-226. [PMID: 24240181 DOI: 10.1016/j.biortech.2013.10.063] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Revised: 10/16/2013] [Accepted: 10/18/2013] [Indexed: 06/02/2023]
Abstract
The purpose of this paper was to study the evolution of microbial community and its relation to the hydrogen production (HP) steps in thermophilic-dry dark fermentation from real organic fraction of municipal solid waste (OFMSW). Nine organic loading rates (OLRs) (from 9 to 220 g TVS/l/d) were investigated. Population dynamics study showed that increasing OLR (between 9 and 110 g TVS/l/d) resulted in an increase in the relations between Eubacteria:Archaea and hydrolytic-acidogenic bacteria (HABs):acetogens. This was strongly influenced by the microbial content of the OFMSW. The presence of acetogens and Archaea was due to contribution of these microorganisms in the substrate (the biogas produced was methane-free). The maximum value of hydrolysis (63±7%) was observed at 110 g TVS/l/d OLR according to maximum HP and HAB activity. The highest average values of acidification yields (57-60%) were achieved for OLR between 28 and 43 g TVS/l/d.
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Affiliation(s)
- S Zahedi
- Department of Environmental Technologies, Faculty of Marine and Environmental Sciences (CASEM), University of Cádiz, Pol, Río San Pedro s/n, 11510 Puerto Real, Cádiz, Spain.
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Manyi-Loh CE, Mamphweli SN, Meyer EL, Okoh AI, Makaka G, Simon M. Microbial anaerobic digestion (bio-digesters) as an approach to the decontamination of animal wastes in pollution control and the generation of renewable energy. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2013; 10:4390-417. [PMID: 24048207 PMCID: PMC3799523 DOI: 10.3390/ijerph10094390] [Citation(s) in RCA: 111] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 09/09/2013] [Accepted: 09/10/2013] [Indexed: 11/16/2022]
Abstract
With an ever increasing population rate; a vast array of biomass wastes rich in organic and inorganic nutrients as well as pathogenic microorganisms will result from the diversified human, industrial and agricultural activities. Anaerobic digestion is applauded as one of the best ways to properly handle and manage these wastes. Animal wastes have been recognized as suitable substrates for anaerobic digestion process, a natural biological process in which complex organic materials are broken down into simpler molecules in the absence of oxygen by the concerted activities of four sets of metabolically linked microorganisms. This process occurs in an airtight chamber (biodigester) via four stages represented by hydrolytic, acidogenic, acetogenic and methanogenic microorganisms. The microbial population and structure can be identified by the combined use of culture-based, microscopic and molecular techniques. Overall, the process is affected by bio-digester design, operational factors and manure characteristics. The purpose of anaerobic digestion is the production of a renewable energy source (biogas) and an odor free nutrient-rich fertilizer. Conversely, if animal wastes are accidentally found in the environment, it can cause a drastic chain of environmental and public health complications.
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Affiliation(s)
- Christy E. Manyi-Loh
- Fort Hare Institute of Technology, University of Fort Hare, Alice Campus, Alice 5700, Eastern Cape Province, South Africa; E-Mails: (S.N.M.); (E.L.M.); (M.S.)
- Applied and Environmental Microbiology Research Group (AEMREG), Department of Biochemistry and Microbiology, University of Fort Hare, Alice Campus, Alice 5700, Eastern Cape Province, South Africa; E-Mail:
| | - Sampson N. Mamphweli
- Fort Hare Institute of Technology, University of Fort Hare, Alice Campus, Alice 5700, Eastern Cape Province, South Africa; E-Mails: (S.N.M.); (E.L.M.); (M.S.)
| | - Edson L. Meyer
- Fort Hare Institute of Technology, University of Fort Hare, Alice Campus, Alice 5700, Eastern Cape Province, South Africa; E-Mails: (S.N.M.); (E.L.M.); (M.S.)
| | - Anthony I. Okoh
- Applied and Environmental Microbiology Research Group (AEMREG), Department of Biochemistry and Microbiology, University of Fort Hare, Alice Campus, Alice 5700, Eastern Cape Province, South Africa; E-Mail:
| | - Golden Makaka
- Department of Physics, University of Fort Hare, Alice Campus, Alice 5700, Eastern Cape Province, South Africa; E-Mail:
| | - Michael Simon
- Fort Hare Institute of Technology, University of Fort Hare, Alice Campus, Alice 5700, Eastern Cape Province, South Africa; E-Mails: (S.N.M.); (E.L.M.); (M.S.)
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Effect of an oxygen-tolerant bifurcating butyryl coenzyme A dehydrogenase/electron-transferring flavoprotein complex from Clostridium difficile on butyrate production in Escherichia coli. J Bacteriol 2013; 195:3704-13. [PMID: 23772070 DOI: 10.1128/jb.00321-13] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The butyrogenic genes from Clostridium difficile DSM 1296(T) have been cloned and expressed in Escherichia coli. The enzymes acetyl-coenzyme A (CoA) C-acetyltransferase, 3-hydroxybutyryl-CoA dehydrogenase, crotonase, phosphate butyryltransferase, and butyrate kinase and the butyryl-CoA dehydrogenase complex composed of the dehydrogenase and two electron-transferring flavoprotein subunits were individually produced in E. coli and kinetically characterized in vitro. While most of these enzymes were measured using well-established test systems, novel methods to determine butyrate kinase and butyryl-CoA dehydrogenase activities with respect to physiological function were developed. Subsequently, the individual genes were combined to form a single plasmid-encoded operon in a plasmid vector, which was successfully used to confer butyrate-forming capability to the host. In vitro and in vivo studies demonstrated that C. difficile possesses a bifurcating butyryl-CoA dehydrogenase which catalyzes the NADH-dependent reduction of ferredoxin coupled to the reduction of crotonyl-CoA also by NADH. Since the reoxidation of ferredoxin by a membrane-bound ferredoxin:NAD(+)-oxidoreductase enables electron transport phosphorylation, additional ATP is formed. The butyryl-CoA dehydrogenase from C. difficile is oxygen stable and apparently uses oxygen as a co-oxidant of NADH in the presence of air. These properties suggest that this enzyme complex might be well suited to provide butyryl-CoA for solventogenesis in recombinant strains. The central role of bifurcating butyryl-CoA dehydrogenases and membrane-bound ferredoxin:NAD oxidoreductases (Rhodobacter nitrogen fixation [RNF]), which affect the energy yield of butyrate fermentation in the clostridial metabolism, is discussed.
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50
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Meng X, Zhang Y, Li Q, Quan X. Adding Fe0 powder to enhance the anaerobic conversion of propionate to acetate. Biochem Eng J 2013. [DOI: 10.1016/j.bej.2013.02.004] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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