51
|
Andreides D, Bautista Quispe JI, Bartackova J, Pokorna D, Zabranska J. A novel two-stage process for biological conversion of syngas to biomethane. BIORESOURCE TECHNOLOGY 2021; 327:124811. [PMID: 33592492 DOI: 10.1016/j.biortech.2021.124811] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 01/28/2021] [Accepted: 01/29/2021] [Indexed: 06/12/2023]
Abstract
This study shows biomethane production in a novel two-stage syngas biomethanation consisting of the thermophilic anaerobic digestion of sewage sludge combined with an injection of syngas as the first stage. Since the syngas does not contain enough reducing equivalents, the produced biogas was connected to the second stage consisting of the trickle-bed reactor with the external H2 addition (ex-situ) to increase the CH4 content further. The aim was to evaluate the influence of different syngas compositions on the biomethane production in both stages. The results showed that H2 concentration in syngas is the main factor affecting the CH4 content in biogas. Moreover, the ex-situ reactor with H2 addition served to convert the residual CO and CO2, achieving the maximum CH4 content of 94.7% in the produced biomethane. In summary, the two-stage process enables biomethane production without any inhibitory effects on anaerobic sludge digestion.
Collapse
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.
| | - Jhonny Ismael Bautista Quispe
- 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 Bartackova
- Department of Water Technology and Environmental Engineering, Faculty of Environmental Technology, University of Chemistry and Technology Prague, Technicka 1905, 166 28 Prague, Czech Republic
| | - Dana Pokorna
- 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
| |
Collapse
|
52
|
Pérez D, Lie TT, Weber CC. Operationalization of a microbial electrolysis cell: The interaction of the primary factors for energy storage efficiency. BIORESOURCE TECHNOLOGY 2021; 326:124788. [PMID: 33561662 DOI: 10.1016/j.biortech.2021.124788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 01/24/2021] [Accepted: 01/25/2021] [Indexed: 06/12/2023]
Abstract
Microbial electrolysis cells have attracted attention as a method to enhance anaerobic digesters' performance. However, optimization of individual factors is not directly transferrable among systems as many are intimately linked and influenced by the system design, influent, and inoculum. To avoid this, here the effects and interactions between the relative electrode size, hydraulic retention time (HRT), and voltage imposed have been explored within a pair of otherwise identical reactors. Methane production has a positive correlation with the applied voltage, reaching 12.9 mLCH4 L-1h-1 with 10 days HRT and 1000 mV, also achieving 35% energy storage efficiency, despite the higher electrical input. Shorter HRTs led to bacterial washouts, reducing the methane production below 10 mLCH4 L-1h-1. Contour plots were constructed to relate the energy storage efficiency with operational conditions changes. These highlighted the benefits of using a relatively larger cathode than anode for improving energy storage efficiency.
Collapse
Affiliation(s)
- Danilo Pérez
- School of Engineering, Computer and Mathematical Science, Auckland University of Technology, Auckland, New Zealand.
| | - Tek T Lie
- School of Engineering, Computer and Mathematical Science, Auckland University of Technology, Auckland, New Zealand
| | - Cameron C Weber
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| |
Collapse
|
53
|
Zeppilli M, Cristiani L, Dell'Armi E, Villano M. Potentiostatic vs galvanostatic operation of a Microbial Electrolysis Cell for ammonium recovery and biogas upgrading. Biochem Eng J 2021. [DOI: 10.1016/j.bej.2020.107886] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
54
|
Performance Analysis and Microbial Community Evolution of In Situ Biological Biogas Upgrading with Increasing H 2/CO 2 Ratio. ACTA ACUST UNITED AC 2021; 2021:8894455. [PMID: 33628124 PMCID: PMC7889367 DOI: 10.1155/2021/8894455] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 07/27/2020] [Accepted: 01/15/2021] [Indexed: 01/04/2023]
Abstract
The effect of the amount of hydrogen supplied for the in situ biological biogas upgrading was investigated by monitoring the process and evolution of the microbial community. Two parallel reactors, operated at 37°C for 211 days, were continuously fed with sewage sludge at a constant organic loading rate of 1.5 gCOD∙(L∙d)−1 and hydrogen (H2). The molar ratio of H2/CO2 was progressively increased from 0.5 : 1 to 7 : 1 to convert carbon dioxide (CO2) into biomethane via hydrogenotrophic methanogenesis. Changes in the biogas composition become statistically different above the stoichiometric H2/CO2 ratio (4 : 1). At a H2/CO2 ratio of 7 : 1, the methane content in the biogas reached 90%, without adversely affecting degradation of the organic matter. The possibility of selecting, adapting, and enriching the original biomass with target-oriented microorganisms able to biologically convert CO2 into methane was verified: high throughput sequencing of 16S rRNA gene revealed that hydrogenotrophic methanogens, belonging to Methanolinea and Methanobacterium genera, were dominant. Based on the outcomes of this study, further optimization and engineering of this process is feasible and needed as a means to boost energy recovery from sludge treatment.
Collapse
|
55
|
Gao T, Zhang H, Xu X, Teng J. Integrating microbial electrolysis cell based on electrochemical carbon dioxide reduction into anaerobic osmosis membrane reactor for biogas upgrading. WATER RESEARCH 2021; 190:116679. [PMID: 33279741 DOI: 10.1016/j.watres.2020.116679] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 11/02/2020] [Accepted: 11/24/2020] [Indexed: 06/12/2023]
Abstract
It has been reported that anaerobic osmosis membrane bioreactors have the potential for energy recovery since dissolved methane was almost rejected by commercial forward osmosis membranes. Notwithstanding, upgraded biogas has to be achieved by removing as much carbon dioxide as possible. In this study, a novel anaerobic osmotic membrane bioreactor-microbial electrolysis cell (AnOMBR-MEC) system was developed for simultaneous biogas upgrading and wastewater treatment. The AnOMBR-MEC elicited an excellent and stable soluble chemical oxygen demand and phosphorus removal. As the experiment progressed, unwanted carbon dioxide produced from biogas was reduced to formate using a SnO2 nanoparticles electrocatalytic cathode in an electrocatalytic-assisted MEC, with the highest faradic efficiency of formate being 85% at 1.2V. Compared to AnOMBR, the methane content increased from 55% to 90% at the end of operation and methane yield experienced a1.6-fold increment in the AnOMBR-MEC. Microbial community analysis revealed that hydrogenotrophic methanogens (e.g. Methanobacterium and Methanobrevibacter) converted the produced H2 and formate to methane at saline conditions. These results have demonstrated an efficient strategy based on the integration of an electrocatalytic-assisted MEC into AnOMBR for upgrading biogas, enhancing methane yield and wastewater treatment.
Collapse
Affiliation(s)
- Tianyu Gao
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, No.2 Linggong Road, Dalian 116024, P. R. China
| | - Hanmin Zhang
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, No.2 Linggong Road, Dalian 116024, P. R. China.
| | - Xiaotong Xu
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, No.2 Linggong Road, Dalian 116024, P. R. China
| | - Jiaheng Teng
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, No.2 Linggong Road, Dalian 116024, P. R. China
| |
Collapse
|
56
|
Logroño W, Popp D, Nikolausz M, Kluge P, Harms H, Kleinsteuber S. Microbial Communities in Flexible Biomethanation of Hydrogen Are Functionally Resilient Upon Starvation. Front Microbiol 2021; 12:619632. [PMID: 33643248 PMCID: PMC7904901 DOI: 10.3389/fmicb.2021.619632] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Accepted: 01/14/2021] [Indexed: 12/20/2022] Open
Abstract
Ex situ biomethanation allows the conversion of hydrogen produced from surplus electricity to methane. The flexibility of the process was recently demonstrated, yet it is unknown how intermittent hydrogen feeding impacts the functionality of the microbial communities. We investigated the effect of starvation events on the hydrogen consumption and methane production rates (MPRs) of two different methanogenic communities that were fed with hydrogen and carbon dioxide. Both communities showed functional resilience in terms of hydrogen consumption and MPRs upon starvation periods of up to 14 days. The origin of the inoculum, community structure and dominant methanogens were decisive for high gas conversion rates. Thus, pre-screening a well performing inoculum is essential to ensure the efficiency of biomethanation systems operating under flexible gas feeding regimes. Our results suggest that the type of the predominant hydrogenotrophic methanogen (here: Methanobacterium) is important for an efficient process. We also show that flexible biomethanation of hydrogen and carbon dioxide with complex microbiota is possible while avoiding the accumulation of acetate, which is relevant for practical implementation. In our study, the inoculum from an upflow anaerobic sludge blanket reactor treating wastewater from paper industry performed better compared to the inoculum from a plug flow reactor treating cow manure and corn silage. Therefore, the implementation of the power-to-gas concept in wastewater treatment plants of the paper industry, where biocatalytic biomass is readily available, may be a viable option to reduce the carbon footprint of the paper industry.
Collapse
Affiliation(s)
- Washington Logroño
- Department of Environmental Microbiology, Helmholtz Centre for Environmental Research - UFZ, Leipzig, Germany
| | - Denny Popp
- Department of Environmental Microbiology, Helmholtz Centre for Environmental Research - UFZ, Leipzig, Germany
| | - Marcell Nikolausz
- Department of Environmental Microbiology, Helmholtz Centre for Environmental Research - UFZ, Leipzig, Germany
| | - Paul Kluge
- Department of Environmental Microbiology, Helmholtz Centre for Environmental Research - UFZ, Leipzig, Germany
| | - Hauke Harms
- Department of Environmental Microbiology, Helmholtz Centre for Environmental Research - UFZ, Leipzig, Germany
| | - Sabine Kleinsteuber
- Department of Environmental Microbiology, Helmholtz Centre for Environmental Research - UFZ, Leipzig, Germany
| |
Collapse
|
57
|
Pratofiorito G, Hackbarth M, Mandel C, Madlanga S, West S, Horn H, Hille-Reichel A. A membrane biofilm reactor for hydrogenotrophic methanation. BIORESOURCE TECHNOLOGY 2021; 321:124444. [PMID: 33285505 DOI: 10.1016/j.biortech.2020.124444] [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: 10/28/2020] [Revised: 11/20/2020] [Accepted: 11/21/2020] [Indexed: 06/12/2023]
Abstract
Biomethanation of CO2 has been proven to be a feasible way to produce methane with the employment of H2 as electron source. Subject of the present study is a custom-made membrane biofilm reactor for hydrogenotrophic methanation by archaeal biofilms cultivated on membrane surfaces. Reactor layout was adapted to allow for in situ biofilm analysis via optical coherence tomography. At a feeding ratio of H2/CO2 of 3.6, and despite the low membrane surface to reactor volume ratio of 57.9 m2 m-3, the maximum methane production per reactor volume reached up to 1.17 Nm3 m-3 d-1 at a methane content of the produced gas above 97% (v/v). These results demonstrate that the concept of membrane bound biofilms enables improved mass transfer by delivering substrate gases directly to the biofilm, thus, rendering the bottleneck of low solubility of hydrogen in water less drastic.
Collapse
Affiliation(s)
- Giorgio Pratofiorito
- Karlsruhe Institute of Technology (KIT), Engler-Bunte-Institut, Water Chemistry and Water Technology, Engler-Bunte-Ring 9a, 76131 Karlsruhe, Germany.
| | - Max Hackbarth
- Karlsruhe Institute of Technology (KIT), Engler-Bunte-Institut, Water Chemistry and Water Technology, Engler-Bunte-Ring 9a, 76131 Karlsruhe, Germany; DVGW Research Centre at Engler-Bunte-Institut of Karlsruhe Institute of Technology (KIT), Water Chemistry, Engler-Bunte-Ring 9a, 76131 Karlsruhe, Germany.
| | - Carmen Mandel
- Karlsruhe Institute of Technology (KIT), Engler-Bunte-Institut, Water Chemistry and Water Technology, Engler-Bunte-Ring 9a, 76131 Karlsruhe, Germany.
| | - Siyavuya Madlanga
- Karlsruhe Institute of Technology (KIT), Engler-Bunte-Institut, Water Chemistry and Water Technology, Engler-Bunte-Ring 9a, 76131 Karlsruhe, Germany; DVGW Research Centre at Engler-Bunte-Institut of Karlsruhe Institute of Technology (KIT), Water Chemistry, Engler-Bunte-Ring 9a, 76131 Karlsruhe, Germany.
| | - Stephanie West
- Karlsruhe Institute of Technology (KIT), Engler-Bunte-Institut, Water Chemistry and Water Technology, Engler-Bunte-Ring 9a, 76131 Karlsruhe, Germany.
| | - Harald Horn
- Karlsruhe Institute of Technology (KIT), Engler-Bunte-Institut, Water Chemistry and Water Technology, Engler-Bunte-Ring 9a, 76131 Karlsruhe, Germany; DVGW Research Centre at Engler-Bunte-Institut of Karlsruhe Institute of Technology (KIT), Water Chemistry, Engler-Bunte-Ring 9a, 76131 Karlsruhe, Germany.
| | - Andrea Hille-Reichel
- Karlsruhe Institute of Technology (KIT), Engler-Bunte-Institut, Water Chemistry and Water Technology, Engler-Bunte-Ring 9a, 76131 Karlsruhe, Germany.
| |
Collapse
|
58
|
Jensen MB, Jensen B, Ottosen LDM, Kofoed MVW. Integrating H2 injection and reactor mixing for low-cost H2 gas-liquid mass transfer in full-scale in situ biomethanation. Biochem Eng J 2021. [DOI: 10.1016/j.bej.2020.107869] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
59
|
Zha X, Tsapekos P, Zhu X, Khoshnevisan B, Lu X, Angelidaki I. Bioconversion of wastewater to single cell protein by methanotrophic bacteria. BIORESOURCE TECHNOLOGY 2021; 320:124351. [PMID: 33161316 DOI: 10.1016/j.biortech.2020.124351] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 10/19/2020] [Accepted: 10/27/2020] [Indexed: 05/25/2023]
Abstract
Single cell protein (SCP) provides an alternative protein source to partially replace the conventional agricultural resources and support the increased nutritional needs. Inexpensive feeding source is one of the key limiting factors for the expansion of SCP production. The present study examined the valorization of biogas derived from the anaerobic digestion (AD) of sewage sludge and the discarded effluent as nutrients source to produce SCP using methanotrophic bacteria. Results indicated that the mixed methanotrophic culture can grow well on the pasteurized AD supernatant and biogas, succeeding in promising dry weight (DW) yield (0.66 ± 0.01 g-DW/g-CH4 and 11.54 ± 0.12 g-DW/g-NH4+). Methylomonas (56.26%) and Methylophilus (24.60%) spp. were the two main representatives of the mixed culture. The produced dried biomass had a protein content higher than 41% w/w, including essential amino acids like histidine, valine, phenylalanine, isoleucine, leucine, threonine and lysine. The cultivated SCP shows potential utilization as protein source for animal diets.
Collapse
Affiliation(s)
- Xiao Zha
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark; School of Energy and Environment, Southeast University, No. 2 Sipailou Road, Nanjing 210096, China
| | - Panagiotis Tsapekos
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark.
| | - Xinyu Zhu
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark
| | - Benyamin Khoshnevisan
- Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Xiwu Lu
- School of Energy and Environment, Southeast University, No. 2 Sipailou Road, Nanjing 210096, China
| | - Irini Angelidaki
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark
| |
Collapse
|
60
|
Temperature and Inoculum Origin Influence the Performance of Ex-Situ Biological Hydrogen Methanation. Molecules 2020; 25:molecules25235665. [PMID: 33271799 PMCID: PMC7730501 DOI: 10.3390/molecules25235665] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 11/27/2020] [Accepted: 11/29/2020] [Indexed: 11/16/2022] Open
Abstract
The conversion of H2 into methane can be carried out by microorganisms in a process so-called biomethanation. In ex-situ biomethanation H2 and CO2 gas are exogenous to the system. One of the main limitations of the biomethanation process is the low gas-liquid transfer rate and solubility of H2 which are strongly influenced by the temperature. Hydrogenotrophic methanogens that are responsible for the biomethanation reaction are also very sensitive to temperature variations. The aim of this work was to evaluate the impact of temperature on batch biomethanation process in mixed culture. The performances of mesophilic and thermophilic inocula were assessed at 4 temperatures (24, 35, 55 and 65 °C). A negative impact of the low temperature (24 °C) was observed on microbial kinetics. Although methane production rate was higher at 55 and 65 °C (respectively 290 ± 55 and 309 ± 109 mL CH4/L.day for the mesophilic inoculum) than at 24 and 35 °C (respectively 156 ± 41 and 253 ± 51 mL CH4/L.day), the instability of the system substantially increased, likely because of a strong dominance of only Methanothermobacter species. Considering the maximal methane production rates and their stability all along the experiments, an optimal temperature range of 35 °C or 55 °C is recommended to operate ex-situ biomethanation process.
Collapse
|
61
|
Chen L, Du S, Xie L. Effects of pH on ex-situ biomethanation with hydrogenotrophic methanogens under thermophilic and extreme-thermophilic conditions. J Biosci Bioeng 2020; 131:168-175. [PMID: 33199191 DOI: 10.1016/j.jbiosc.2020.09.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 08/26/2020] [Accepted: 09/26/2020] [Indexed: 11/16/2022]
Abstract
Ex-situ biogas upgrading based on hydrogenotrophic methanogenic process has attracted much attention with the depletion of fossil fuels. Consumption of CO2 leads to the pH increase in the mixed cultures of biogas upgrading system. The hydrogenotrophic methanogens were enriched at pH 5.5-6.0, 7.0-7.5, and 8.5-9.0 and at 55°C and 70°C. The methane production activity and microbial community structure were evaluated. Semi-continuous experimental results showed that stable and similar methane production was obtained at pH 7.0-7.5 and 8.5-9.0. In addition, pH 8.5-9.0 presented higher maximum methane production rate compared to pH 7.0-7.5. pH below 6 obtained the longest lag phase time of about 17.4 h, more than twice the values at pH 7.0-7.5 (8.8 h) and pH 8.5-9.0 (6.9 h) at 55°C. The predominant methanogen was the genus Methanothermobacter, a hydrogenotrophic methanogen at higher temperatures. Methanobacterium became predominant at pH 8.5-9.0 and the abundance increased to 83.6% at 55°C. Coprothermobacter and Caldanaerobacter were identified as the core functional bacteria under alkaline condition and were likely involved in syntrophic acetate oxidation with hydrogenotrophic methanogens.
Collapse
Affiliation(s)
- Lurui Chen
- Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China
| | - Shiyun Du
- Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China
| | - Li Xie
- Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China.
| |
Collapse
|
62
|
Li C, Zhu X, Angelidaki I. Carbon monoxide conversion and syngas biomethanation mediated by different microbial consortia. BIORESOURCE TECHNOLOGY 2020; 314:123739. [PMID: 32615449 DOI: 10.1016/j.biortech.2020.123739] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 06/21/2020] [Accepted: 06/22/2020] [Indexed: 06/11/2023]
Abstract
Syngas biomethanation is an attractive process for extending application of gasification products. In the present study, anaerobic sludges from three methanogenic reactors feeding cattle manure (CS), sewage sludge (SS) and gaseous H2/CO2 (GS) were used to investigate the effect of microbial consortia composition on syngas biomethanation. The results showed that CS presented the highest CO consumption rate due to its highest relative abundance of CO consuming bacteria. The CO was mainly converted to acetate, and syntrophic acetate oxidization (SAO) bacteria converted acetate to H2/CO2 for hydrogenotrophic methanogenesis in CS and SS. However, acetate was accumulated in GS for lacking acetoclastic methanogens and SAO bacteria, leading to lower biomethanation efficiency. Additionally, adding stoichiometric H2 could convert CO and CO2 to nearly pure methane, while, the CO consumption rate declined in H2 added systems. The results present novel insights into microbial consortia on CO conversion and syngas biomethanation.
Collapse
Affiliation(s)
- Chunxing Li
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark
| | - Xinyu Zhu
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark.
| | - Irini Angelidaki
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark
| |
Collapse
|
63
|
Tsapekos P, Zhu X, Pallis E, Angelidaki I. Proteinaceous methanotrophs for feed additive using biowaste as carbon and nutrients source. BIORESOURCE TECHNOLOGY 2020; 313:123646. [PMID: 32535520 DOI: 10.1016/j.biortech.2020.123646] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 06/03/2020] [Accepted: 06/05/2020] [Indexed: 06/11/2023]
Abstract
To achieve a sustainable production of food and feed production, inexpensive carbon and nutrient sources are needed. In the present study, biologically upgraded biogas is coupled with electrochemically extracted nitrogen from digested biowaste to cultivate mixed methanotrophs as protein source. Results showed that an increase from less than 5 μgCu2+/L to 100 μgCu2+/L increased the biomass production by 41%. Microbial analysis revealed that the dominated Methylomonas spp. followed by Methylophilus spp. created a specialized community for high CH4 assimilation. Moreover, duplicate semi-continuous fermenters run for 120 days validating the efficiency of alternative carbon and nitrogen feedstocks at long-term operation. As for dry cell weight (DCW) production, more than 2.5 g-DCW/L were produced using biologically upgraded biogas and electrochemically extracted nitrogen. Furthermore, the protein content and amino acid profile (>50% of DCW) demonstrated that the microbial biomass pose the characteristics to be used as animal feed additive.
Collapse
Affiliation(s)
- Panagiotis Tsapekos
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark.
| | - Xinyu Zhu
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark
| | - Evangelos Pallis
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark
| | - Irini Angelidaki
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark
| |
Collapse
|
64
|
Fu S, Angelidaki I, Zhang Y. In situ Biogas Upgrading by CO 2-to-CH 4 Bioconversion. Trends Biotechnol 2020; 39:336-347. [PMID: 32917407 DOI: 10.1016/j.tibtech.2020.08.006] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 08/18/2020] [Accepted: 08/18/2020] [Indexed: 11/30/2022]
Abstract
Biogas produced by anaerobic digestion is an important renewable energy carrier. Nevertheless, the high CO2 content in biogas limits its utilization to mainly heat and electricity generation. Upgrading biogas into biomethane broadens its potential as a vehicle fuel or substitute for natural gas. CO2-to-CH4 bioconversion represents one cutting-edge solution for biogas upgrading. In situ bioconversion can capture endogenous CO2 directly from the biogas reactor, is easy to operate, and provides an infrastructure for renewable electricity storage. Despite these advantages, several challenges need to be addressed to move in situ upgrading technologies closer to applications at scale. This opinion article reviews the state of the art of this technology and identifies some obstacles and opportunities of biological in-situ upgrading technologies for future development.
Collapse
Affiliation(s)
- Shanfei Fu
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, Jiangsu Province 214122, China; Department of Environmental Engineering, Technical University of Denmark, DK-2800 Lyngby, Denmark
| | - Irini Angelidaki
- Department of Environmental Engineering, Technical University of Denmark, DK-2800 Lyngby, Denmark
| | - Yifeng Zhang
- Department of Environmental Engineering, Technical University of Denmark, DK-2800 Lyngby, Denmark.
| |
Collapse
|
65
|
Perez D, Lie TT, Weber CC. Relative electrode size and organic load effects on the energy storage efficiency of microbial electrolysis cells. ACTA ACUST UNITED AC 2020. [DOI: 10.1016/j.biteb.2020.100518] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
66
|
Methanothermobacter thermautotrophicus strain ΔH as a potential microorganism for bioconversion of CO2 to methane. J CO2 UTIL 2020. [DOI: 10.1016/j.jcou.2020.101210] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
|
67
|
Biological CO2 fixation in up-flow reactors via exogenous H2 addition. J Biotechnol 2020; 319:1-7. [DOI: 10.1016/j.jbiotec.2020.05.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 05/06/2020] [Accepted: 05/19/2020] [Indexed: 01/17/2023]
|
68
|
Sekoai PT, Engelbrecht N, du Preez SP, Bessarabov D. Thermophilic Biogas Upgrading via ex Situ Addition of H 2 and CO 2 Using Codigested Feedstocks of Cow Manure and the Organic Fraction of Solid Municipal Waste. ACS OMEGA 2020; 5:17367-17376. [PMID: 32715221 PMCID: PMC7377068 DOI: 10.1021/acsomega.0c01725] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 06/18/2020] [Indexed: 06/11/2023]
Abstract
Bioconversion of renewable H2 and waste CO2 using methanogenic archaea is a promising technology for obtaining high-purity CH4, which can serve as an alternative for natural gas. This process is known as ex situ biogas upgrading. This work highlights the pathway toward the bioconversion of renewable H2 and CO2 into high-purity biomethane by exploiting highly accessible agro-municipal residues: cow manure (CM) and the organic fraction of solid municipal waste (OFSMW), which used to be called "waste materials". More specifically, an ex situ thermophilic (55 °C) biogas upgrading process was conducted by CM and OFSMW codigestion at different mass proportions: 100:0, 80:20, 70:30, 60:40, and 50:50. Maximum CH4 concentrations of 92-97 vol % and biogas volumetric production rates of 4954-6605 NmL/L.d were obtained from a batch reactor of 3 L working volume. Feedstock characterization, pH monitoring, and the carbon-to-nitrogen ratio were critical parameters to evaluate during biogas upgrading experiments. In this work, the usefulness of agro-municipal substrates is highlighted by producing high-purity biomethane-an energetic chemical to facilitate renewable energy conversion, which supports various end-use applications. This process therefore provides a solution to renewable energy storage challenges and future sustainable and green energy supply.
Collapse
|
69
|
Cristiani L, Zeppilli M, Porcu C, Majone M. Ammonium Recovery and Biogas Upgrading in a Tubular Micro-Pilot Microbial Electrolysis Cell (MEC). Molecules 2020; 25:E2723. [PMID: 32545472 PMCID: PMC7356612 DOI: 10.3390/molecules25122723] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 06/01/2020] [Accepted: 06/10/2020] [Indexed: 11/20/2022] Open
Abstract
Here, a 12-liter tubular microbial electrolysis cell (MEC) was developed as a post treatment unit for simultaneous biogas upgrading and ammonium recovery from the liquid effluent of an anaerobic digestion process. The MEC configuration adopted a cation exchange membrane to separate the inner anodic chamber and the external cathodic chamber, which were filled with graphite granules. The cathodic chamber performed the CO2 removal through the bioelectromethanogenesis reaction and alkalinity generation while the anodic oxidation of a synthetic fermentate partially sustained the energy demand of the process. Three different nitrogen load rates (73, 365, and 2229 mg N/Ld) were applied to the inner anodic chamber to test the performances of the whole process in terms of COD (Chemical Oxygen Demand) removal, CO2 removal, and nitrogen recovery. By maintaining the organic load rate at 2.55 g COD/Ld and the anodic chamber polarization at +0.2 V vs. SHE (Standard Hydrogen Electrode), the increase of the nitrogen load rate promoted the ammonium migration and recovery, i.e., the percentage of current counterbalanced by the ammonium migration increased from 1% to 100% by increasing the nitrogen load rate by 30-fold. The CO2 removal slightly increased during the three periods, and permitted the removal of 65% of the influent CO2, which corresponded to an average removal of 2.2 g CO2/Ld. During the operation with the higher nitrogen load rate, the MEC energy consumption, which was simultaneously used for the different operations, was lower than the selected benchmark technologies, i.e., 0.47 kW/N·m3 for CO2 removal and 0.88 kW·h/kg COD for COD oxidation were consumed by the MEC while the ammonium nitrogen recovery consumed 2.3 kW·h/kg N.
Collapse
Affiliation(s)
- Lorenzo Cristiani
- Department of Chemistry, University of Rome Sapienza, Piazzale Aldo Moro 5, 00185 Rome, Italy; (M.Z.); (C.P.); (M.M.)
| | | | | | | |
Collapse
|
70
|
Farooq M, Saeed MA, Imran M, Uddin GM, Asim M, Bilal H, Younas MR, Andresen JM. CO 2 capture through electro-conductive adsorbent using physical adsorption system for sustainable development. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2020; 42:1507-1515. [PMID: 31069597 DOI: 10.1007/s10653-019-00318-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 04/30/2019] [Indexed: 06/09/2023]
Abstract
The most critical energy and environmental challenge that our planet is facing today is to minimize the dependence on fossil fuels. Carbon dioxide may be of utmost significance as a solution of this issue through realization of carbon neutral energy cycle. Potentially, this could be achieved through the carbon dioxide capture as the urgent response to ongoing climate change. Activated carbon (AC) adsorption is one the most effective, environment friendly and techno-economic process for the carbon capture. In the current research, an electro-conductive-activated carbon was prepared by mixing powdered activated carbon (PAC) with an electro-conductive polymer (ECP). Different ratios of 0, 25, 50, 75 and 100 wt% of ECP with PAC were used for the different analyses of activated carbons in a gas mixture of CO2/N2 using a physical adsorption system. Adsorption and desorption analyses, capacities of the process and desorption effects were examined. Electro-conductive polymers (ECP) were mixed with AC samples, where breakthrough time was increased up to 400% when mixed with the PAC for CO2 adsorption. Following adsorption analysis, desorption of activated carbons was conducted with different potentials. It was revealed that mixing could help the PAC sample to overcome the packing issue to increase the breakthrough capacity and the volumes before and after the breakthrough adsorption in the packed bed systems. The desorption rates of the PAC sample were also enhanced, and fast desorption was observed when mixed with ECP. It is envisioned that this method is very much promising carbon capture method for the techno-economic feasibility and sustainable development of the environment.
Collapse
Affiliation(s)
- M Farooq
- Research Centre for Carbon Solutions, Heriot-Watt University, Edinburgh, UK.
- Department of Mechanical Engineering, University of Engineering and Technology, Lahore, Lahore, Pakistan.
| | - M A Saeed
- Department of Chemical and Polymer Engineering, University of Engineering and Technology, Lahore, Faisalabad Campus, Lahore, Pakistan
| | - M Imran
- Department of Mechanical Engineering, Technical University of Denmark, Lyngby, Denmark
- School of Engineering (SEN), University of Management and Technology (UMT) Lahore, Lahore, Pakistan
| | - G M Uddin
- Department of Mechanical Engineering, University of Engineering and Technology, Lahore, Lahore, Pakistan
| | - M Asim
- Department of Mechanical Engineering, University of Engineering and Technology, Lahore, Lahore, Pakistan
| | - H Bilal
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, Sydney, Australia
| | - M R Younas
- School of Engineering (SEN), University of Management and Technology (UMT) Lahore, Lahore, Pakistan
| | - J M Andresen
- Research Centre for Carbon Solutions, Heriot-Watt University, Edinburgh, UK
| |
Collapse
|
71
|
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]
|
72
|
Xu J, Bu F, Zhu W, Luo G, Xie L. Microbial Consortiums of Hydrogenotrophic Methanogenic Mixed Cultures in Lab-Scale Ex-Situ Biogas Upgrading Systems under Different Conditions of Temperature, pH and CO. Microorganisms 2020; 8:microorganisms8050772. [PMID: 32455626 PMCID: PMC7285331 DOI: 10.3390/microorganisms8050772] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 05/15/2020] [Accepted: 05/18/2020] [Indexed: 12/12/2022] Open
Abstract
In this study, hydrogenotrophic methanogenic mixed cultures taken from 13 lab-scale ex-situ biogas upgrading systems under different temperature (20–70 °C), pH (6.0–8.5), and CO (0–10%, v/v) variables were systematically investigated. High-throughput 16S rRNA gene sequencing was used to identify the microbial consortia, and statistical analyses were conducted to reveal the microbial diversity, the core functional microbes, and their correlative relationships with tested variables. Overall, bacterial community was more complex than the archaea community in all mixed cultures. Hydrogenotrophic methanogens Methanothermobacter, Methanobacterium, and Methanomassiliicoccus, and putative syntrophic acetate-oxidizing bacterium Coprothermobacter and Caldanaerobacter were found to predominate, but the core functional microbes varied under different conditions. Multivariable sensitivity analysis indicated that temperature (p < 0.01) was the crucial variable to determine the microbial consortium structures in hydrogenotrophic methanogenic mixed cultures. pH (0.01 < p < 0.05) significantly interfered with the relative abundance of dominant archaea. Although CO did not affect community (p > 0.1), some potential CO-utilizing syntrophic metabolisms might be enhanced. Understanding of microbial consortia in the hydrogenotrophic methanogenic mixed cultures related to environmental variables was a great advance to reveal the microbial ecology in microbial biogas upgrading process.
Collapse
Affiliation(s)
- Jun Xu
- The Yangtze River Water Environment Key Laboratory of the Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; (J.X.); (F.B.); (W.Z.)
| | - Fan Bu
- The Yangtze River Water Environment Key Laboratory of the Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; (J.X.); (F.B.); (W.Z.)
| | - Wenzhe Zhu
- The Yangtze River Water Environment Key Laboratory of the Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; (J.X.); (F.B.); (W.Z.)
| | - Gang Luo
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200092, China;
| | - Li Xie
- The Yangtze River Water Environment Key Laboratory of the Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; (J.X.); (F.B.); (W.Z.)
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
- Correspondence:
| |
Collapse
|
73
|
A Rapid, Sensitive, Low-Cost Assay for Detecting Hydrogenotrophic Methanogens in Anaerobic Digesters Using Loop-Mediated Isothermal Amplification. Microorganisms 2020; 8:microorganisms8050740. [PMID: 32429197 PMCID: PMC7284894 DOI: 10.3390/microorganisms8050740] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 05/11/2020] [Accepted: 05/13/2020] [Indexed: 12/22/2022] Open
Abstract
Understanding how the presence, absence, and abundance of different microbial genera supply specific metabolic functions for anaerobic digestion (AD) and how these impact on gas production is critical for a long-term understanding and optimization of the AD process. The strictly anaerobic methanogenic archaea are essential for methane production within AD microbial communities. Methanogens are a phylogenetically diverse group that can be classified into three metabolically distinct lineages based on the substrates they use to produce methane. While process optimization based on physicochemical parameters is well established in AD, measurements that could allow manipulation of the underlying microbial community are seldom used as they tend to be non-specific, expensive, or time-consuming, or a combination of all three. Loop-mediated isothermal amplification (LAMP) assays combine a simple, rapid, low-cost detection technique with high sensitivity and specificity. Here, we describe the optimization of LAMP assays for the detection of four different genera of hydrogenotrophic methanogens: Methanoculleus, Methanothermobacter, Methanococcus, and Methanobrevibacter spp. By targeting archaeal elongation factor 2 (aEF2), these LAMP assays provide a rapid, low-cost, presence/absence indication of hydrogenotrophic methanogens that could be used as a real-time measure of process conditions. The assays were shown to be sensitive to 1 pg of DNA from most tested methanogen species, providing a route to a quantitative measure through simple serial dilution of samples. The LAMP assays described here offer a simple, fast, and affordable method for the specific detection of four different genera of hydrogenotrophic methanogens. Our results indicate that this approach could be developed into a quantitative measure that could provide rapid, low-cost insight into the functioning and optimization of AD and related systems.
Collapse
|
74
|
Logroño W, Popp D, Kleinsteuber S, Sträuber H, Harms H, Nikolausz M. Microbial Resource Management for Ex Situ Biomethanation of Hydrogen at Alkaline pH. Microorganisms 2020; 8:microorganisms8040614. [PMID: 32344539 PMCID: PMC7232305 DOI: 10.3390/microorganisms8040614] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 04/16/2020] [Accepted: 04/21/2020] [Indexed: 12/13/2022] Open
Abstract
Biomethanation is a promising solution to convert H2 (produced from surplus electricity) and CO2 to CH4 by using hydrogenotrophic methanogens. In ex situ biomethanation with mixed cultures, homoacetogens and methanogens compete for H2/CO2. We enriched a hydrogenotrophic microbiota on CO2 and H2 as sole carbon and energy sources, respectively, to investigate these competing reactions. The microbial community structure and dynamics of bacteria and methanogenic archaea were evaluated through 16S rRNA and mcrA gene amplicon sequencing, respectively. Hydrogenotrophic methanogens and homoacetogens were enriched, as acetate was concomitantly produced alongside CH4. By controlling the media composition, especially changing the reducing agent, the formation of acetate was lowered and grid quality CH4 (≥97%) was obtained. Formate was identified as an intermediate that was produced and consumed during the bioprocess. Stirring intensities ≥ 1000 rpm were detrimental, probably due to shear force stress. The predominating methanogens belonged to the genera Methanobacterium and Methanoculleus. The bacterial community was dominated by Lutispora. The methanogenic community was stable, whereas the bacterial community was more dynamic. Our results suggest that hydrogenotrophic communities can be steered towards the selective production of CH4 from H2/CO2 by adapting the media composition, the reducing agent and the stirring intensity.
Collapse
|
75
|
Yang HJ, Yang ZM, Xu XH, Guo RB. Increasing the methane production rate of hydrogenotrophic methanogens using biochar as a biocarrier. BIORESOURCE TECHNOLOGY 2020; 302:122829. [PMID: 32028147 DOI: 10.1016/j.biortech.2020.122829] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 01/13/2020] [Accepted: 01/16/2020] [Indexed: 06/10/2023]
Abstract
The existence of CO2 in biogas will affect its practicality, so the methanation of CO2 is of great significance. Carrier materials play a key role in bioconversion of CO2 to methane during biogas upgrading. Herein, different materials were used to evaluate the bioconversion process of CO2 to methane, which consisted of black ceramsite (BC) and biochars prepared from corn straw and digestate. The results showed that after adding the carrier materials, the methane production rate increased by more than 20%, and the corn straw biochar (CSB) group even increased by more than 70%. This may be attributed to the large specific surface area and more functional groups in corn straw biochar which was suitable for the immobilization of hydrogenotrophic methanogens (HMs). Therefore, corn straw biochar is a good carrier material for the accelerated bioconversion of CO2 to methane.
Collapse
Affiliation(s)
- Hao-Jie Yang
- Shandong Industrial Engineering Laboratory of Biogas Production and Utilization, Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong Province 266101, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Zhi-Man Yang
- Shandong Industrial Engineering Laboratory of Biogas Production and Utilization, Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong Province 266101, PR China
| | - Xiao-Hui Xu
- Shandong Industrial Engineering Laboratory of Biogas Production and Utilization, Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong Province 266101, PR China
| | - Rong-Bo Guo
- Shandong Industrial Engineering Laboratory of Biogas Production and Utilization, Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong Province 266101, PR China; Dalian National Laboratory for Clean Energy, Dalian 116023, PR China.
| |
Collapse
|
76
|
The hydrogen gas bio-based economy and the production of renewable building block chemicals, food and energy. N Biotechnol 2020; 55:12-18. [DOI: 10.1016/j.nbt.2019.09.004] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 09/17/2019] [Accepted: 09/17/2019] [Indexed: 12/25/2022]
|
77
|
Bakonyi P, Peter J, Koter S, Mateos R, Kumar G, Koók L, Rózsenberszki T, Pientka Z, Kujawski W, Kim SH, Nemestóthy N, Bélafi-Bakó K, Pant D. Possibilities for the biologically-assisted utilization of CO2-rich gaseous waste streams generated during membrane technological separation of biohydrogen. J CO2 UTIL 2020. [DOI: 10.1016/j.jcou.2019.11.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
78
|
Tsapekos P, Khoshnevisan B, Zhu X, Zha X, Angelidaki I. Methane oxidising bacteria to upcycle effluent streams from anaerobic digestion of municipal biowaste. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 251:109590. [PMID: 31550605 DOI: 10.1016/j.jenvman.2019.109590] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 09/10/2019] [Accepted: 09/16/2019] [Indexed: 06/10/2023]
Abstract
Conventional microbial protein production relies on the usage of pure chemicals and gases. Natural gas, which is a fossil resource, is the common input gas for bacterial protein production. Alternative sources for gas feedstock and nutrients can sufficiently decrease the operational cost and environmental impact of microbial protein production processes. In the present study, the effluents streams of municipal biowaste anaerobic digestion, were used to grow methane oxidising bacteria which can be used as protein source. Results demonstrated that a 40:60 CH4:O2 (v/v) gas feeding resulted in microbial biomass production of 0.95 g-DM/L by a Methylophilus dominated community. When raw biogas was used as input for methane corresponding to the same initial methane partial pressure as before, instead of pure methane, the growth was partially hindered (0.61 g-DM/L) due to the presence of H2S (IC50: 1376 ppm). Hence, desulfurization is suggested before using biogas for microbial protein production. At semi-continuous mode, results showed that the produced biomass had relatively high protein content (>40% of dry weight) and the essential amino acids lysine, valine, leucine and histidine were detected at high levels.
Collapse
Affiliation(s)
- Panagiotis Tsapekos
- Department of Environmental Engineering, Technical University of Denmark, Kgs, Lyngby, DK-2800, Denmark
| | - Benyamin Khoshnevisan
- Department of Environmental Engineering, Technical University of Denmark, Kgs, Lyngby, DK-2800, Denmark; Department of Mechanical Engineering of Agricultural Machinery, Faculty of Agricultural Engineering and Technology, College of Agriculture and Natural Resources, University of Tehran, Iran
| | - Xinyu Zhu
- Department of Environmental Engineering, Technical University of Denmark, Kgs, Lyngby, DK-2800, Denmark
| | - Xiao Zha
- Department of Environmental Engineering, Technical University of Denmark, Kgs, Lyngby, DK-2800, Denmark; School of Energy and Environment, Southeast University, No. 2 Sipailou Road, Nanjing, 210096, China
| | - Irini Angelidaki
- Department of Environmental Engineering, Technical University of Denmark, Kgs, Lyngby, DK-2800, Denmark
| |
Collapse
|
79
|
Tian H, Yan M, Treu L, Angelidaki I, Fotidis IA. Hydrogenotrophic methanogens are the key for a successful bioaugmentation to alleviate ammonia inhibition in thermophilic anaerobic digesters. BIORESOURCE TECHNOLOGY 2019; 293:122070. [PMID: 31491648 DOI: 10.1016/j.biortech.2019.122070] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2019] [Revised: 08/20/2019] [Accepted: 08/24/2019] [Indexed: 05/20/2023]
Abstract
Bioaugmentation to alleviate ammonia inhibition under thermophilic anaerobic digestion has never been reported, as well as the working mechanism that allows a fast and successful bioaugmentation. Thus two bioaugmentation inocula (an enriched culture, and a mixed culture composed 50/50 by Methanoculleus thermophilus and the enriched culture) on the recovery of ammonia-inhibited thermophilic continuous reactors was assessed. The results showed that bioaugmentation improved methane yield by 11-13% and decreased the volatile fatty acids (VFA) by 45-52% compared to the control reactor (abiotic augmentation). Moreover, the importance of hydrogenotrophic methanogens to a fast and successful bioaugmentation was recognized. Specifically, the instant hydrogen partial pressure reduction by the bioaugmented hydrogenotroph created thermodynamically favourable conditions for the acetate oxidation process and consequently, the catabolism of other VFA. High-throughput sequencing results strengthened this explanation by showing that the bioaugmented M. thermophilus stimulated the growth of syntrophic acetate oxidising bacterium Thermacetogenium phaeum, immediately after bioaugmentation.
Collapse
Affiliation(s)
- Hailin Tian
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet Bygning 115, 2800 Kgs. Lyngby, Denmark; Environmental Research Institute, National University of Singapore, 1 Create Way, Create Tower, Singapore 138602, Singapore
| | - Miao Yan
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet Bygning 115, 2800 Kgs. Lyngby, Denmark
| | - Laura Treu
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet Bygning 115, 2800 Kgs. Lyngby, Denmark; Department of Biology, University of Padua, 35131 Padua, Italy
| | - Irini Angelidaki
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet Bygning 115, 2800 Kgs. Lyngby, Denmark
| | - Ioannis A Fotidis
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet Bygning 115, 2800 Kgs. Lyngby, Denmark.
| |
Collapse
|
80
|
Biogas Upgrading: A Review of National Biomethane Strategies and Support Policies in Selected Countries. ENERGIES 2019. [DOI: 10.3390/en12193803] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Bioenergy contributes significantly towards the share of renewable energies, in Europe and worldwide. Besides solid and liquid biofuels, gaseous biofuels, such as biogas or upgraded biogas (biomethane), are an established renewable fuel in Europe. Although many studies consider biomethane technologies, feedstock potentials, or sustainability issues, the literature on the required legislative framework for market introduction is limited. Therefore, this research aims at identifying the market and legislative framework conditions in the three leading biomethane markets in Europe and compare them to the framework conditions of the top six non-European biomethane markets. This study shows the global status and national differences in promoting this renewable energy carrier. For the cross-country comparison, a systematic and iterative literature review is conducted. The results show the top three European biomethane markets (Germany, United Kingdom, Sweden) and the six non-European biomethane markets (Brazil, Canada, China, Japan, South Korea, and the United States of America), pursuing different promotion approaches and framework conditions. Noteworthy cross-national findings are the role of state-level incentives, the tendency to utilise biomethane as vehicular fuel and the focus on residues and waste as feedstock for biomethane production. Presenting a cross-country comparison, this study supports cross-country learning for the promotion of renewable energies like biomethane and gives a pertinent overview of the work.
Collapse
|
81
|
Adnan AI, Ong MY, Nomanbhay S, Chew KW, Show PL. Technologies for Biogas Upgrading to Biomethane: A Review. Bioengineering (Basel) 2019; 6:bioengineering6040092. [PMID: 31581659 PMCID: PMC6956267 DOI: 10.3390/bioengineering6040092] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 09/28/2019] [Accepted: 09/30/2019] [Indexed: 11/23/2022] Open
Abstract
The environmental impacts and high long-term costs of poor waste disposal have pushed the industry to realize the potential of turning this problem into an economic and sustainable initiative. Anaerobic digestion and the production of biogas can provide an efficient means of meeting several objectives concerning energy, environmental, and waste management policy. Biogas contains methane (60%) and carbon dioxide (40%) as its principal constituent. Excluding methane, other gasses contained in biogas are considered as contaminants. Removal of these impurities, especially carbon dioxide, will increase the biogas quality for further use. Integrating biological processes into the bio-refinery that effectively consume carbon dioxide will become increasingly important. Such process integration could significantly improve the sustainability of the overall bio-refinery process. The biogas upgrading by utilization of carbon dioxide rather than removal of it is a suitable strategy in this direction. The present work is a critical review that summarizes state-of-the-art technologies for biogas upgrading with particular attention to the emerging biological methanation processes. It also discusses the future perspectives for overcoming the challenges associated with upgradation. While biogas offers a good substitution for fossil fuels, it still not a perfect solution for global greenhouse gas emissions and further research still needs to be conducted.
Collapse
Affiliation(s)
- Amir Izzuddin Adnan
- Institute of Sustainable Energy, Universiti Tenaga Nasional, 43000 Kajang, Selangor, Malaysia.
| | - Mei Yin Ong
- Institute of Sustainable Energy, Universiti Tenaga Nasional, 43000 Kajang, Selangor, Malaysia.
| | - Saifuddin Nomanbhay
- Institute of Sustainable Energy, Universiti Tenaga Nasional, 43000 Kajang, Selangor, Malaysia.
| | - Kit Wayne Chew
- Department of Chemical and Environmental Engineering, Faculty of Science and Engineering, University of Nottingham Malaysia, Jalan Broga, 43500 Semenyih, Selangor, Malaysia.
| | - Pau Loke Show
- Department of Chemical and Environmental Engineering, Faculty of Science and Engineering, University of Nottingham Malaysia, Jalan Broga, 43500 Semenyih, Selangor, Malaysia.
| |
Collapse
|
82
|
Omar B, El-Gammal M, Abou-Shanab R, Fotidis IA, Angelidaki I, Zhang Y. Biogas upgrading and biochemical production from gas fermentation: Impact of microbial community and gas composition. BIORESOURCE TECHNOLOGY 2019; 286:121413. [PMID: 31078978 DOI: 10.1016/j.biortech.2019.121413] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 05/01/2019] [Accepted: 05/02/2019] [Indexed: 06/09/2023]
Abstract
The present study proposes a novel alternative method of the current biogas upgrading techniques by converting CO2 (in the biogas) into valuable chemicals (e.g., volatile fatty acids) using H2 as energy source and acetogenic mixed culture as biocatalyst. The influence of thermal treatment (90 °C) on the inhibition of the methanogenic archaea and enriching the acetogenic bacteria in different inocula (mesophilic and thermophilic) was initially tested. The most efficient inoculum that achieved the highest performance through the fermentation process was further used to define the optimum H2/CO2 gas ratio that secures maximum production yield of chemicals and maximum biogas upgrading efficiency. In addition, 16S rRNA analysis of the microbial community was conducted at the end of the experimental period to target functional microbes. The maximum biogas content (77% (v/v)) and acetate yield (72%) were achieved for 2H2:1CO2 ratio (v/v), with Moorella sp. 4 as the most dominant thermophilic acetogenic bacterium.
Collapse
Affiliation(s)
- Basma Omar
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet Bygning 115, DK-2800 Kgs. Lyngby, Denmark; Department of Environmental Sciences, Faculty of Science, Damietta University, 34517 Damietta, Egypt
| | - Maie El-Gammal
- Department of Environmental Sciences, Faculty of Science, Damietta University, 34517 Damietta, Egypt
| | - Reda Abou-Shanab
- Department of Environmental Biotechnology, City of Scientific Research and Technology Applications, Alexandria 21934, Egypt
| | - Ioannis A Fotidis
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet Bygning 115, DK-2800 Kgs. Lyngby, Denmark
| | - Irini Angelidaki
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet Bygning 115, DK-2800 Kgs. Lyngby, Denmark
| | - Yifeng Zhang
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet Bygning 115, DK-2800 Kgs. Lyngby, Denmark.
| |
Collapse
|
83
|
Lebranchu A, Blanchard F, Fick M, Pacaud S, Olmos E, Delaunay S. Pilot-scale biomethanation of cattle manure using dense membranes. BIORESOURCE TECHNOLOGY 2019; 284:430-436. [PMID: 30978646 DOI: 10.1016/j.biortech.2019.03.140] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 03/27/2019] [Accepted: 03/28/2019] [Indexed: 06/09/2023]
Abstract
This study aimed at studying the biomethanation process using a 100 L pilot-scale digester equipped with a dense membrane for hydrogen injection. Hydrogen mass transfer was characterized and the impact of hydrogen flowrate, agitation rate and of the co-injection of CO2, on biogas production and composition, was precisely studied. A linear relationship between H2 flowrate and the CO2 and CH4 rates in biogas was found but no impact on biogas flowrate was shown. It was also noticed that, without exogenous CO2 injection, and for high H2 injection flowrates, residual H2 could be found at the digester outlet due to local CO2 limitation. Thus, this study suggested that biogas production in biomethanation process at the pilot scale was probably rather limited by the dissolved CO2 transport within the liquid phase than by the hydrogen mass transfer itself.
Collapse
Affiliation(s)
- Aline Lebranchu
- CNRS, Laboratoire Réactions et Génie des Procédés, UMR 7274, 2 avenue de la forêt de Haye, TSA 40602, Vandœuvre-lès-Nancy F-54518, France; Université de Lorraine, LRGP, UMR 7274, 2 avenue de la forêt de Haye, TSA 40602, Vandœuvre-lès-Nancy F-54518, France
| | - Fabrice Blanchard
- CNRS, Laboratoire Réactions et Génie des Procédés, UMR 7274, 2 avenue de la forêt de Haye, TSA 40602, Vandœuvre-lès-Nancy F-54518, France; Université de Lorraine, LRGP, UMR 7274, 2 avenue de la forêt de Haye, TSA 40602, Vandœuvre-lès-Nancy F-54518, France
| | - Michel Fick
- CNRS, Laboratoire Réactions et Génie des Procédés, UMR 7274, 2 avenue de la forêt de Haye, TSA 40602, Vandœuvre-lès-Nancy F-54518, France; Université de Lorraine, LRGP, UMR 7274, 2 avenue de la forêt de Haye, TSA 40602, Vandœuvre-lès-Nancy F-54518, France
| | - Stéphane Pacaud
- ENSAIA, Université de Lorraine, 2 avenue de la forêt de Haye, TSA 40602, Vandœuvre-lès-Nancy F-54518, France
| | - Eric Olmos
- CNRS, Laboratoire Réactions et Génie des Procédés, UMR 7274, 2 avenue de la forêt de Haye, TSA 40602, Vandœuvre-lès-Nancy F-54518, France; Université de Lorraine, LRGP, UMR 7274, 2 avenue de la forêt de Haye, TSA 40602, Vandœuvre-lès-Nancy F-54518, France.
| | - Stéphane Delaunay
- CNRS, Laboratoire Réactions et Génie des Procédés, UMR 7274, 2 avenue de la forêt de Haye, TSA 40602, Vandœuvre-lès-Nancy F-54518, France; Université de Lorraine, LRGP, UMR 7274, 2 avenue de la forêt de Haye, TSA 40602, Vandœuvre-lès-Nancy F-54518, France
| |
Collapse
|
84
|
Prussi M, Padella M, Conton M, Postma E, Lonza L. Review of technologies for biomethane production and assessment of Eu transport share in 2030. JOURNAL OF CLEANER PRODUCTION 2019; 222:565-572. [PMID: 32255926 PMCID: PMC7099754 DOI: 10.1016/j.jclepro.2019.02.271] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The upgrade to biomethane allows extending biogas applications to transport sectors, supporting EU goals toward carbon neutrality. Biomethane produced from biogas upgrading can today rely on a large number of plants, estimated by the European Biogas Association in over 17000 in 2016, for a total installed capacity of 9985 GW (EBA, 2017). After 2020, biogas and biomethane will count towards the 32% target of renewable energy share of the EU energy consumption, and towards a sub-target of minimum 14% of the energy consumed in the transport sector by 2030 (REDII). In this framework, the paper aims to define the current market penetration of biogas upgrading technologies. A database has been created for EU-28, to highlight the relative importance of each technology. Based on the database, a EU production potential is defined, along with the EU demand potential for transport, in order to verify the match between supply and demand. The analysis of the current state of play of the sector suggests that a large potential can be foreseen for near future; the expected increase in biomethane production is based also on the possibility to convert residual feedstocks, such as Municipal Solid Wastes. In this work a moderate technology penetration scenario has been set for EU-28, reaching a potential for biomethane of 18 billion m3/year in 2030. A large share of this potential can be devoted to transport, with a relevant impact on the sector. LNG appears suitable for pushing the market uptake of biomethane in the transport sector. Among the potential uses of biomethane for transport, it is worth considering that the natural gas use in the maritime and internal waterways sectors is getting momentum. The current analysis aimed to highlight the potential of renewable energy-based alternatives to natural gas. Eventually, it is worth noticing that the real market deployment of this potential will be determined by the energy market conditions, and by the member states capability to stimulate the industry through a coherent set of supporting initiatives.
Collapse
Affiliation(s)
- M. Prussi
- European Commission, Joint Research Centre (JRC), Ispra, Italy
- Corresponding author.
| | - M. Padella
- European Commission, Joint Research Centre (JRC), Ispra, Italy
| | - M. Conton
- Natural & Bio Gas Vehicle Association (NGVA Europe), av. de Cortenbergh 172, 1000, Brussels, Belgium
| | - E.D. Postma
- Natural & Bio Gas Vehicle Association (NGVA Europe), av. de Cortenbergh 172, 1000, Brussels, Belgium
| | - L. Lonza
- European Commission, Joint Research Centre (JRC), Ispra, Italy
| |
Collapse
|
85
|
Yanuka-Golub K, Baransi-Karkaby K, Szczupak A, Reshef L, Rishpon J, Shechter R, Gophna U, Sabbah I. An electrode-assisted anaerobic digestion process for the production of high-quality biogas. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2019; 79:2145-2155. [PMID: 31318352 DOI: 10.2166/wst.2019.214] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Biogas is a sustainable, renewable energy source generated from organic waste degradation during anaerobic digestion (AD). AD is applied for treating different types of wastewater, mostly containing high organic load. However, AD practice is still limited due to the low quality of the produced biogas. Upgrading biogas to natural gas quality (>90% CH4) is essential for broad applications. Here, an innovative bio-electrochemically assisted AD process was developed, combining wastewater treatment and biogas upgrading. This process was based on a microbial electrolysis cell (MEC) that produced hydrogen from wastewater at a relatively high efficiency, followed by high-rate anaerobic systems for completing biodegradation of organic matter and an in situ bio-methanation process. Results showed that CH4 production yield was substantially improved upon coupling of the MEC with the AD system. Interestingly, CH4 production yield increase was most notable once circulation between AD and MEC was applied, while current density was not markedly affected by the circulation rates. The microbial community analysis confirmed that the MEC enhanced hydrogen production, leading to the enrichment of hydrogenotrophic methanogens. Thus, directing soluble hydrogen from the MEC to AD is plausible, and has great potential for biogas upgrading, avoiding the need for direct hydrogen harvesting.
Collapse
Affiliation(s)
- K Yanuka-Golub
- School of Molecular Cell Biology and Biotechnology, Tel Aviv University, P.O. Box 39040, Tel Aviv 6997801, Israel E-mail:
| | - K Baransi-Karkaby
- The Regional Research & Development Center, The Galilee Society, P.O. Box 437, Shefa-Amr 20200, Israel
| | - A Szczupak
- Fluence Water Products and Innovation, 1 HaEshel Street Caesarea Industrial Park, Caesarea 30889, Israel
| | - L Reshef
- School of Molecular Cell Biology and Biotechnology, Tel Aviv University, P.O. Box 39040, Tel Aviv 6997801, Israel E-mail:
| | - J Rishpon
- School of Molecular Cell Biology and Biotechnology, Tel Aviv University, P.O. Box 39040, Tel Aviv 6997801, Israel E-mail:
| | - R Shechter
- Fluence Water Products and Innovation, 1 HaEshel Street Caesarea Industrial Park, Caesarea 30889, Israel
| | - U Gophna
- School of Molecular Cell Biology and Biotechnology, Tel Aviv University, P.O. Box 39040, Tel Aviv 6997801, Israel E-mail:
| | - I Sabbah
- The Regional Research & Development Center, The Galilee Society, P.O. Box 437, Shefa-Amr 20200, Israel; Prof. Ephraim Katzir Department of Biotechnology Engineering, Braude College, Karmiel 2161002, Israel
| |
Collapse
|
86
|
Alfaro N, Fdz-Polanco M, Fdz-Polanco F, Díaz I. H 2 addition through a submerged membrane for in-situ biogas upgrading in the anaerobic digestion of sewage sludge. BIORESOURCE TECHNOLOGY 2019; 280:1-8. [PMID: 30743054 DOI: 10.1016/j.biortech.2019.01.135] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 01/28/2019] [Accepted: 01/29/2019] [Indexed: 06/09/2023]
Abstract
In-situ upgrading of biogas in a mesophilic anaerobic digester of sewage sludge by sparging H2 through a membrane was studied. Large gas recirculation rates were required to facilitate H2 transfer to the bulk liquid phase; at ∼200 L Lreactor-1 d-1, H2 utilization efficiency averaged 94% and the specific CH4 production increased from 0.38 L Lreactor-1 d-1, during conventional digestion, to 0.54 L Lreactor-1 d-1. Sludge digestion was not compromised by elevated H2 partial pressure nor by the associated rise in the pH (8.1) because of CO2 removal. In this regard, VFA accumulation was not detected and the performance of VS removal was similar to the observed without H2 supply. Microbial analysis revealed that homoacetogens were outcompeted by hydrogenotrophic methanogens. Methanoculleus sp., Methanospirillum sp., Methanolinea sp. and Methanobacterium sp. were the hydrogenotrophic archaea present over the experiment.
Collapse
Affiliation(s)
- Natalia Alfaro
- Department of Chemical Engineering and Environmental Technology, Escuela de Ingenierías Industriales, Sede Dr. Mergelina, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain
| | - María Fdz-Polanco
- Department of Chemical Engineering and Environmental Technology, Escuela de Ingenierías Industriales, Sede Dr. Mergelina, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain; Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain
| | - Fernando Fdz-Polanco
- Department of Chemical Engineering and Environmental Technology, Escuela de Ingenierías Industriales, Sede Dr. Mergelina, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain; Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain
| | - Israel Díaz
- Department of Chemical Engineering and Environmental Technology, Escuela de Ingenierías Industriales, Sede Dr. Mergelina, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain; Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain.
| |
Collapse
|
87
|
Wahid R, Mulat DG, Gaby JC, Horn SJ. Effects of H 2:CO 2 ratio and H 2 supply fluctuation on methane content and microbial community composition during in-situ biological biogas upgrading. BIOTECHNOLOGY FOR BIOFUELS 2019; 12:104. [PMID: 31164923 PMCID: PMC6489297 DOI: 10.1186/s13068-019-1443-6] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Accepted: 04/16/2019] [Indexed: 05/30/2023]
Abstract
BACKGROUND Commercial biogas upgrading facilities are expensive and consume energy. Biological biogas upgrading may serve as a low-cost approach because it can be easily integrated with existing facilities at biogas plants. The microbial communities found in anaerobic digesters typically contain hydrogenotrophic methanogens, which can use hydrogen (H2) as a reducing agent for conversion of carbon dioxide (CO2) into methane (CH4). Thus, biological biogas upgrading through the exogenous addition of H2 into biogas digesters for the conversion of CO2 into CH4 can increase CH4 yield and lower CO2 emission. RESULTS The addition of 4 mol of H2 per mol of CO2 was optimal for batch biogas reactors and increased the CH4 content of the biogas from 67 to 94%. The CO2 content of the biogas was reduced from 33 to 3% and the average residual H2 content was 3%. At molar H2:CO2 ratios > 4:1, all CO2 was converted into CH4, but the pH increased above 8 due to depletion of CO2, which negatively influenced the process stability. Additionally, high residual H2 content in these reactors was unfavourable, causing volatile fatty acid accumulation and reduced CH4 yields. The reactor microbial communities shifted in composition over time, which corresponded to changes in the reactor variables. Numerous taxa responded to the H2 inputs, and in particular the hydrogenotrophic methanogen Methanobacterium increased in abundance with addition of H2. In addition, the apparent rapid response of hydrogenotrophic methanogens to intermittent H2 feeding indicates the suitability of biological methanation for variable H2 inputs, aligning well with fluctuations in renewable electricity production that may be used to produce H2. CONCLUSIONS Our research demonstrates that the H2:CO2 ratio has a significant effect on reactor performance during in situ biological methanation. Consequently, the H2:CO2 molar ratio should be kept at 4:1 to avoid process instability. A shift toward hydrogenotrophic methanogenesis was indicated by an increase in the abundance of the obligate hydrogenotrophic methanogen Methanobacterium.
Collapse
Affiliation(s)
- Radziah Wahid
- Faculty of Chemistry, Biotechnology, and Food Science, Norwegian University of Life Sciences (NMBU), P.O. Box 5003, 1432 Ås, Norway
| | - Daniel Girma Mulat
- Faculty of Chemistry, Biotechnology, and Food Science, Norwegian University of Life Sciences (NMBU), P.O. Box 5003, 1432 Ås, Norway
| | - John Christian Gaby
- Faculty of Chemistry, Biotechnology, and Food Science, Norwegian University of Life Sciences (NMBU), P.O. Box 5003, 1432 Ås, Norway
| | - Svein Jarle Horn
- Faculty of Chemistry, Biotechnology, and Food Science, Norwegian University of Life Sciences (NMBU), P.O. Box 5003, 1432 Ås, Norway
| |
Collapse
|
88
|
Kapoor R, Ghosh P, Kumar M, Vijay VK. Evaluation of biogas upgrading technologies and future perspectives: a review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:11631-11661. [PMID: 30877529 DOI: 10.1007/s11356-019-04767-1] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 03/04/2019] [Indexed: 06/09/2023]
Abstract
Biogas is acknowledged as one of the foremost bioenergy to address the current environmental and energy challenges being faced by the world. Commonly, biogas is used for applications like cooking, lighting, heat and power production. To widen the scope of biogas application, like transportation, natural gas grid injection and substrate for the production of chemicals and fuel cells, mainly CO2, H2S and other impurities need to be removed by various upgrading technologies. It is an important process to produce biomethane with above 90% methane. There are various physico-chemical (adsorption, absorption, cryogenic and membrane separations) and biological (in situ and ex situ) processes for biogas upgradation, and each process is site and case specific. The aim of the present paper is to thoroughly evaluate the existing and emerging biogas upgrading technologies. Analysis of each technology with respect to basis of operations, energy requirement, methane purity and recovery and cost economics has been carried out. A thorough analysis has been done on the major hurdles and the research gaps in this sector. For a wider and successful implementation of the biogas upgradation technology, the trends in research and development (R&D) such as development of efficient biogas upgrading technologies, adsorbents, reduction in cost and methane loss have been thoroughly evaluated.
Collapse
Affiliation(s)
- Rimika Kapoor
- Centre for Rural Development and Technology, Indian Institute of Technology Delhi, New Delhi, 110016, India.
| | - Pooja Ghosh
- Centre for Rural Development and Technology, Indian Institute of Technology Delhi, New Delhi, 110016, India
| | - Madan Kumar
- Centre for Rural Development and Technology, Indian Institute of Technology Delhi, New Delhi, 110016, India
| | - Virendra Kumar Vijay
- Centre for Rural Development and Technology, Indian Institute of Technology Delhi, New Delhi, 110016, India.
| |
Collapse
|
89
|
Porté H, Kougias PG, Alfaro N, Treu L, Campanaro S, Angelidaki I. Process performance and microbial community structure in thermophilic trickling biofilter reactors for biogas upgrading. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 655:529-538. [PMID: 30476832 DOI: 10.1016/j.scitotenv.2018.11.289] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 11/05/2018] [Accepted: 11/19/2018] [Indexed: 05/07/2023]
Abstract
This study evaluated the process performance and determined the microbial community structure of two lab-scale thermophilic trickling biofilter reactors used for biological methanation of hydrogen and carbon-dioxide for a total period of 94 days. Stable and robust operation was achieved by means of a single-pass gas flow. The quality of the output gas (>97%) was comparable to the methane purity achieved by commercial biogas upgrading systems fulfilling the specifications to be used as substitute to natural gas. The reactors' methane productivity reached >1.7 LCH4/(LR·d) at hydrogen loading rate of 7.2 LH2/(LR·d). The spatial distribution of the microbial consortia localized in the liquid media and biofilm enabled us to gain a deeper understanding on how the microbiome is structured inside the trickling biofilter. Sequencing results revealed a significant predominance of Methanothermobacter sp. in the biofilm. Unknown members of the class Clostridia were highly abundant in biofilm and liquid media, while acetate utilising bacteria predominated in liquid samples.
Collapse
Affiliation(s)
- Hugo Porté
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark
| | - Panagiotis G Kougias
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark.
| | - Natalia Alfaro
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark; Institute of Sustainable Processes, Department of Chemical Engineering and Environmental Technology, Escuela de Ingenierías Industriales, Sede Dr. Mergelina, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain
| | - Laura Treu
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark
| | | | - Irini Angelidaki
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark
| |
Collapse
|
90
|
Corbellini V, Catenacci A, Malpei F. Hydrogenotrophic biogas upgrading integrated into WWTPs: enrichment strategy. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2019; 79:759-770. [PMID: 30975942 DOI: 10.2166/wst.2019.096] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Within the European circular economy roadmap, it is important for wastewater treatment plant (WWTPs) to recover energy and become energy-neutral or -positive. In the last few years, it has become increasingly interesting to boost energy recovery through the biogas upgrading. The aim of this work is to study a rapid hydrogenotrophic methanogenic culture enrichment strategy capable of limiting the organic degradation unbalance and allowing a fast start-up phase of the in situ biogas upgrading reactors, at pilot- or full-scale. The approach was tested with two, plus one control, laboratory-scale continuous stirred tank reactors filled with anaerobic sludge collected from a full-scale WWTP. The experimentation lasted 50 days and was divided into five phases: the anaerobic digestion start-up followed by four H2 injection phases (H2/CO2 ranging from 1:1 to 4:1 on molar basis). Despite a temporary slight increase in the total concentration of volatile fatty acids during phase II (2.56 gCH3COOH·L-1), and in phase III a mild pH increase (anyway, below 7.4) indicating the expected CO2 depletion, the strategy proposed was effective. In the last phase, in the biogas a methane content of about 80% was achieved, thus suggesting that the use of H2/CO2 above the stoichiometric value could further improve the biological biogas upgrading.
Collapse
Affiliation(s)
- V Corbellini
- Department of Civil and Environmental Engineering - DICA, Politecnico di Milano, Environmental Section, Piazza L. da Vinci 32, 20133 Milano, Italy E-mail:
| | - A Catenacci
- Department of Civil and Environmental Engineering - DICA, Politecnico di Milano, Environmental Section, Piazza L. da Vinci 32, 20133 Milano, Italy E-mail:
| | - F Malpei
- Department of Civil and Environmental Engineering - DICA, Politecnico di Milano, Environmental Section, Piazza L. da Vinci 32, 20133 Milano, Italy E-mail:
| |
Collapse
|
91
|
Enzmann F, Mayer F, Stöckl M, Mangold KM, Hommel R, Holtmann D. Transferring bioelectrochemical processes from H-cells to a scalable bubble column reactor. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2018.08.056] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
92
|
Yu D, Meng X, Liu J, Dian L, Sui Q, Zhang J, Zhong H, Wei Y. Formation and characteristics of a ternary pH buffer system for in-situ biogas upgrading in two-phase anaerobic membrane bioreactor treating starch wastewater. BIORESOURCE TECHNOLOGY 2018; 269:57-66. [PMID: 30149255 DOI: 10.1016/j.biortech.2018.08.072] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 08/16/2018] [Accepted: 08/17/2018] [Indexed: 05/27/2023]
Abstract
Biochemical biogas upgrading retaining more CO2 from biogas to form biomethane opens new avenues for sustainable biofuel production. For developing this technology, maintaining sustain pH for CO2·H2O is fundamental. This study proposes an innovative control strategy for in-situ biogas upgrading retaining and converting the CO2 in the biogas into CH4, via hydrogenotrophic methanogenesis without external agent. The Biogas-pH strategy limited pH drop over 7.4 by stop feeding and maintained the methanogenesis activity by biogas flow rate over 98 ml·h-1. Low pH (7.37-7.80) decrease CO2·H2O as a substrate in stage-I, higher pH (7.40-8.41) enhances CO2 to CO2·H2O transfer by 6.29 ± 2.20% in stage-II. Because of that 95% CO2·H2O converts to HCO3- and CO32- when pH > 7.9, higher pH > 7.9 did not further upgrading the biogas. The carbonate buffer system shown open and close system characteristics in gas and liquid phase. The biogas CH4 was upgraded from 67.27 ± 5.21% to 73.56 ± 5.01%.
Collapse
Affiliation(s)
- Dawei Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Department of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Xiaoshan Meng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Department of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jibao Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Department of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Liu Dian
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Qianwen Sui
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Department of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Junya Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Department of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Hui Zhong
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Department of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yuansong Wei
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Department of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| |
Collapse
|
93
|
Zhao N, Jiang Y, Alvarado-Morales M, Treu L, Angelidaki I, Zhang Y. Electricity generation and microbial communities in microbial fuel cell powered by macroalgal biomass. Bioelectrochemistry 2018; 123:145-149. [DOI: 10.1016/j.bioelechem.2018.05.002] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 05/02/2018] [Accepted: 05/02/2018] [Indexed: 10/17/2022]
|
94
|
Bu F, Dong N, Kumar Khanal S, Xie L, Zhou Q. Effects of CO on hydrogenotrophic methanogenesis under thermophilic and extreme-thermophilic conditions: Microbial community and biomethanation pathways. BIORESOURCE TECHNOLOGY 2018; 266:364-373. [PMID: 29982059 DOI: 10.1016/j.biortech.2018.03.092] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 03/16/2018] [Accepted: 03/18/2018] [Indexed: 06/08/2023]
Abstract
Coke oven gas is considered as a potential hydrogen source for biogas bio-upgrading. In this study, the effects of CO on biomethanation performance and microbial community structure of hydrogenotrophic mixed cultures were investigated under thermophilic (55 °C) and extreme-thermophilic (70 °C) conditions. 5% (v/v) CO did not inhibit hydrogenotrophic methanogenesis during semi-continuous operation, and 83-97% CO conversion to CH4 was achieved. Methanothermobacter thermoautotrophicus was the dominant methanogen at both temperatures and was the main functional archaea associated with CO biomethanation. Specific methanogenic activity test results showed that long-term 5% CO acclimation shortened the lag phase from 5 h to 1 h at 55 °C and 15 h to 3 h at 70 °C. CO2 was the preferred carbon source over CO for hydrogenotrophic methanogens and CO consumption only started when CO2 was completely depleted. M. thermoautotrophicus dominated mixed cultures showed a great potential in simultaneous hydrogenotrophic methanogenesis and CO biomethanation.
Collapse
Affiliation(s)
- Fan Bu
- State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China
| | - Nanshi Dong
- State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China
| | - Samir Kumar Khanal
- Department of Molecular Biosciences and Bioengineering (MBBE), University of Hawai'i at Mānoa, 1955 East-West Road, Agricultural Science Building 218, Honolulu, HI 96822, USA
| | - Li Xie
- State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China.
| | - Qi Zhou
- State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China
| |
Collapse
|
95
|
Omar B, Abou-Shanab R, El-Gammal M, Fotidis IA, Kougias PG, Zhang Y, Angelidaki I. Simultaneous biogas upgrading and biochemicals production using anaerobic bacterial mixed cultures. WATER RESEARCH 2018; 142:86-95. [PMID: 29860195 DOI: 10.1016/j.watres.2018.05.049] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 05/07/2018] [Accepted: 05/28/2018] [Indexed: 06/08/2023]
Abstract
A novel biological process to upgrade biogas was developed and optimised during the current study. In this process, CO2 in the biogas and externally provided H2 were fermented under mesophilic conditions to volatile fatty acids (VFAs), which are building blocks of higher-value biofuels. Meanwhile, the biogas was upgraded to biomethane (CH4 >95%), which can be used as a vehicle fuel or injected into the natural gas grid. To establish an efficient fermentative microbial platform, a thermal (at two different temperatures of 70 °C and 90 °C) and a chemical pretreatment method using 2-bromoethanesulfonate were investigated initially to inhibit methanogenesis and enrich the acetogenic bacterial inoculum. Subsequently, the effect of different H2:CO2 ratios on the efficiency of biogas upgrading and production of VFAs were further explored. The composition of the microbial community under different treatment methods and gas ratios has also been unravelled using 16S rRNA analysis. The chemical treatment of the inoculum had successfully blocked the activity of methanogens and enhanced the VFAs production, especially acetate. The chemical treatment led to a significantly better acetate production (291 mg HAc/L) compared to the thermal treatment. Based upon 16S rRNA gene sequencing, it was found that H2-utilizing methanogens were the dominant species in the thermally treated inoculum, while a significantly lower abundance of methanogens was observed in the chemically treated inoculum. The highest biogas content (96% (v/v)) and acetate production were achieved for 2H2:1CO2 ratio (v/v), with Acetoanaerobium noterae, as the dominant homoacetogenic hydrogen scavenger. Results from the present study can pave the way towards more development with respect to microorganisms and conditions for high efficient VFAs production and biogas upgrading.
Collapse
Affiliation(s)
- Basma Omar
- Department of Environmental Engineering, Building 113, Technical University of Denmark, DK-2800 Lyngby, Denmark; Department of Environmental Sciences, Faculty of Science, Damietta University, 34517 Damietta, Egypt
| | - Reda Abou-Shanab
- Department of Environmental Biotechnology, City of Scientific Research and Technology Applications, Alexandria, 21934, Egypt
| | - Maie El-Gammal
- Department of Environmental Sciences, Faculty of Science, Damietta University, 34517 Damietta, Egypt
| | - Ioannis A Fotidis
- Department of Environmental Engineering, Building 113, Technical University of Denmark, DK-2800 Lyngby, Denmark
| | - Panagiotis G Kougias
- Department of Environmental Engineering, Building 113, Technical University of Denmark, DK-2800 Lyngby, Denmark
| | - Yifeng Zhang
- Department of Environmental Engineering, Building 113, Technical University of Denmark, DK-2800 Lyngby, Denmark.
| | - Irini Angelidaki
- Department of Environmental Engineering, Building 113, Technical University of Denmark, DK-2800 Lyngby, Denmark
| |
Collapse
|
96
|
Aryal N, Kvist T, Ammam F, Pant D, Ottosen LDM. An overview of microbial biogas enrichment. BIORESOURCE TECHNOLOGY 2018; 264:359-369. [PMID: 29908874 DOI: 10.1016/j.biortech.2018.06.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2018] [Revised: 06/05/2018] [Accepted: 06/06/2018] [Indexed: 05/07/2023]
Abstract
Biogas upgrading technologies have received widespread attention recently and are researched extensively. Microbial biogas upgrading (biomethanation) relies on the microbial performance in enriched H2 and CO2 environments. In this review, recent developments and applications of CH4 enrichment in microbial methanation processes are systematically reviewed. During biological methanation, either H2 can be injected directly inside the anaerobic digester to enrich CH4 by a consortium of mixed microbial species or H2 can be injected into a separate bioreactor, where CO2 contained in biogas is coupled with H2 and converted to CH4, or a combination hereof. The available microbial technologies based on hydrogen-mediated CH4 enrichment, in particular ex-situ, in-situ and bioelectrochemical, are compared and discussed. Moreover, gas-liquid mass transfer limitations, and dynamics of bacteria-archaea interactions shift after H2 injection are thoroughly discussed. Finally, the summary of existing demonstration, pilot plants and commercial CH4 enrichment plants based on microbial biomethanation are critically reviewed.
Collapse
Affiliation(s)
- Nabin Aryal
- Biological and Chemical Engineering, Aarhus University, Hangovej 2, DK-8200 Aarhus N, Denmark; Danish Gas Technology Centre, Dr. Neergaards Vej 5B, DK-2970 Horsholm, Denmark
| | - Torben Kvist
- Danish Gas Technology Centre, Dr. Neergaards Vej 5B, DK-2970 Horsholm, Denmark
| | - Fariza Ammam
- Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, United Kingdom
| | - Deepak Pant
- Separation and Conversion Technology, Flemish Institute for Technological Research (VITO), Boeretang 200, Mol 2400, Belgium
| | - Lars D M Ottosen
- Biological and Chemical Engineering, Aarhus University, Hangovej 2, DK-8200 Aarhus N, Denmark.
| |
Collapse
|
97
|
Treu L, Kougias PG, de Diego-Díaz B, Campanaro S, Bassani I, Fernández-Rodríguez J, Angelidaki I. Two-year microbial adaptation during hydrogen-mediated biogas upgrading process in a serial reactor configuration. BIORESOURCE TECHNOLOGY 2018; 264:140-147. [PMID: 29800774 DOI: 10.1016/j.biortech.2018.05.070] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 05/17/2018] [Accepted: 05/18/2018] [Indexed: 05/07/2023]
Abstract
Microbial dynamics in an upgrading biogas reactor system undergoing a more than two years-period at stable operating conditions were explored. The carbon dioxide generated during biomass degradation in the first reactor of the system was converted to methane into the secondary reactor by addition of external hydrogen. Considering the overall efficiency, the long-term operation period resulted in an improved biogas upgrading performance (99% methane content). However, a remarkable accumulation of acetate was revealed, indicating the enhancement of homoacetogenic activity. For this reason, a shift in the anaerobic digestion microbiome was expected and evaluated by 16S rRNA amplicon analysis. Results demonstrated that the most abundant archaeal species identified in the first time point, Candidatus Methanoculleus thermohydrogenotrophicum, was replaced by Methanothermobacter thermautotrophicus, becoming dominant after the community adaptation. The most interesting taxonomic units were clustered by relative abundance and six main long-term adaptation trends were found, characterizing functionally related microbes (e.g. homoacetogens).
Collapse
Affiliation(s)
- L Treu
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark
| | - P G Kougias
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark.
| | - B de Diego-Díaz
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark; Department of Chemistry, University of Navarra, Spain
| | - S Campanaro
- Department of Biology, University of Padua, Via U. Bassi 58/b, 35131 Padova, Italy
| | - I Bassani
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark
| | | | - I Angelidaki
- Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark
| |
Collapse
|
98
|
Savvas S, Donnelly J, Patterson T, Chong ZS, Esteves SR. Methanogenic capacity and robustness of hydrogenotrophic cultures based on closed nutrient recycling via microbial catabolism: Impact of temperature and microbial attachment. BIORESOURCE TECHNOLOGY 2018; 257:164-171. [PMID: 29500950 DOI: 10.1016/j.biortech.2018.02.109] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 02/21/2018] [Accepted: 02/22/2018] [Indexed: 06/08/2023]
Abstract
A biological methanation system based on nutrient recycling via mixed culture microbial catabolism was investigated at mesophilic (37 °C) and thermophilic (55 °C) temperatures. At mesophilic temperatures, the formation of biofilms on two different types of material was assessed. Results showed that with intense mixing the biofilm reactors presented methanogenic capacities (per working volume) 50% higher than the ones operated with suspended cultures. Gas feeding rates of 200 L/L/d were achieved at a H2/CO2 to CH4 conversion efficiency of above 90% by linking two reactors in series. Furthermore the robustness of the cultures was assessed under a series of inhibitory conditions that simulated possible process interferences at full scale operation. Full recovery after separate intense oxygenation and long starvation periods was observed within 2-5 days.
Collapse
Affiliation(s)
- Savvas Savvas
- Wales Centre of Excellence for Anaerobic Digestion, Sustainable Environment Research Centre, University of South Wales, Pontypridd CF37 1DL, Wales, UK.
| | - Joanne Donnelly
- Wales Centre of Excellence for Anaerobic Digestion, Sustainable Environment Research Centre, University of South Wales, Pontypridd CF37 1DL, Wales, UK
| | - Tim Patterson
- Wales Centre of Excellence for Anaerobic Digestion, Sustainable Environment Research Centre, University of South Wales, Pontypridd CF37 1DL, Wales, UK
| | - Zyh Siong Chong
- Engineering Research Centre, Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd CF37 1DL, Wales, UK
| | - Sandra R Esteves
- Wales Centre of Excellence for Anaerobic Digestion, Sustainable Environment Research Centre, University of South Wales, Pontypridd CF37 1DL, Wales, UK
| |
Collapse
|
99
|
Treu L, Campanaro S, Kougias PG, Sartori C, Bassani I, Angelidaki I. Hydrogen-Fueled Microbial Pathways in Biogas Upgrading Systems Revealed by Genome-Centric Metagenomics. Front Microbiol 2018; 9:1079. [PMID: 29892275 PMCID: PMC5985405 DOI: 10.3389/fmicb.2018.01079] [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: 03/09/2018] [Accepted: 05/07/2018] [Indexed: 01/16/2023] Open
Abstract
Biogas upgrading via carbon dioxide hydrogenation is an emerging technology for electrofuel production. The biomethanation efficiency is strongly dependent on a balanced microbial consortium, whose high- resolution characterization along with their functional potential and interactions are pivotal for process optimization. The present work is the first genome-centric metagenomic study on mesophilic and thermophilic biogas upgrading reactors aiming to define the metabolic profile of more than 200 uncultivated microbes involved in hydrogen assisted methanogenesis. The outcomes from predictive functional analyses were correlated with microbial abundance variations to clarify the effect of process parameters on the community. The operational temperature significantly influenced the microbial richness of the reactors, while the H2 addition distinctively alternated the abundance of the taxa. Two different Methanoculleus species (one mesophilic and one thermophilic) were identified as the main responsible ones for methane metabolism. Finally, it was demonstrated that the addition of H2 exerted a selective pressure on the concerted or syntrophic interactions of specific microbes functionally related to carbon fixation, propionate and butanoate metabolisms. Novel bacteria were identified as candidate syntrophic acetate oxidizers (e.g., Tepidanaerobacter sp. DTU063), while the addition of H2 favored the proliferation of potential homoacetogens (e.g., Clostridia sp. DTU183). Population genomes encoding genes of Wood-Ljungdahl pathway were mainly thermophilic, while propionate degraders were mostly identified at mesophilic conditions. Finally, putative syntrophic interactions were identified between microbes that have either versatile metabolic abilities or are obligate/facultative syntrophs.
Collapse
Affiliation(s)
- Laura Treu
- Department of Environmental Engineering, Technical University of Denmark, Kongens Lyngby, Denmark
| | | | - Panagiotis G. Kougias
- Department of Environmental Engineering, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Cristina Sartori
- Department of Agronomy, Food Natural Resources Animals and Environment, University of Padova, Padova, Italy
| | - Ilaria Bassani
- Department of Environmental Engineering, Technical University of Denmark, Kongens Lyngby, Denmark
| | | |
Collapse
|
100
|
Fontana A, Campanaro S, Treu L, Kougias PG, Cappa F, Morelli L, Angelidaki I. Performance and genome-centric metagenomics of thermophilic single and two-stage anaerobic digesters treating cheese wastes. WATER RESEARCH 2018; 134:181-191. [PMID: 29427960 DOI: 10.1016/j.watres.2018.02.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 01/31/2018] [Accepted: 02/01/2018] [Indexed: 05/25/2023]
Abstract
The present research is the first comprehensive study regarding the thermophilic anaerobic degradation of cheese wastewater, which combines the evaluation of different reactor configurations (i.e. single and two-stage continuous stirred tank reactors) on the process efficiency and the in-depth characterization of the microbial community structure using genome-centric metagenomics. Both reactor configurations showed acidification problems under the tested organic loading rates (OLRs) of 3.6 and 2.4 g COD/L-reactor day and the hydraulic retention time (HRT) of 15 days. However, the two-stage design reached a methane yield equal to 95% of the theoretical value, in contrast with the single stage configuration, which reached a maximum of 33% of the theoretical methane yield. The metagenomic analysis identified 22 new population genomes and revealed that the microbial compositions between the two configurations were remarkably different, demonstrating a higher methanogenic biodiversity in the two-stage configuration. In fact, the acidogenic reactor of the serial configuration was almost solely composed by the lactose degrader Bifidobacterium crudilactis UC0001. The predictive functional analyses of the main population genomes highlighted specific metabolic pathways responsible for the AD process and the mechanisms of main intermediates production. Particularly, the acetate accumulation experienced by the single stage configuration was mainly correlated to the low abundant syntrophic acetate oxidizer Tepidanaerobacter acetatoxydans UC0018 and to the absence of aceticlastic methanogens.
Collapse
Affiliation(s)
- Alessandra Fontana
- Department for Sustainable Food Process - DiSTAS, Catholic University of the Sacred Heart, 29122 Piacenza, Italy; Department of Environmental Engineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | | | - Laura Treu
- Department of Environmental Engineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Panagiotis G Kougias
- Department of Environmental Engineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.
| | - Fabrizio Cappa
- Department for Sustainable Food Process - DiSTAS, Catholic University of the Sacred Heart, 29122 Piacenza, Italy
| | - Lorenzo Morelli
- Department for Sustainable Food Process - DiSTAS, Catholic University of the Sacred Heart, 29122 Piacenza, Italy
| | - Irini Angelidaki
- Department of Environmental Engineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| |
Collapse
|