Conversion of Biomass-Generated Syngas into Next-Generation Liquid Transport Fuels through Microbial Intervention: Potential and Current Status

Verma, Dipti; Singla, Ashish; Lal, Banwari; Sarma, Priyangshu M.

doi:10.18520/cs/v110/i3/329-336

Cited by 24 publications

(16 citation statements)

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“…Acetogenic bacteria are currently the predominant microbial group subject to study in syngas fermentation processes, with ethanol being the most commonly targeted product. Syngas fermentation processes for the production of ethanol [2][3][4][5][6][7][8] and other products, such as acetone, butanol, 2,3-butanediol, and even biopolymers, have been extensively reviewed recently including several process-development related aspects such as bioreactor design, relevant operational parameters, and genetic tools for broadening the product portfolio of the syngas bioconversion. [9][10][11][12][13][14][15] However, the biological process of syngas conversion into methane is oft en overlooked in these reviews despite the research carried out in this fi eld in recent years.…”

Section: Introductionmentioning

confidence: 99%

Syngas biomethanation: state‐of‐the‐art review and perspectives

Grimalt‐Alemany

Skiadas

Gavala

2017

Biofuels Bioprod Bioref

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Signifi cant research efforts are currently being made worldwide to develop more effi cient biomethane production processes from a variety of waste streams. The biomethanation of biomassderived syngas can contribute to increasing the potential of methane production as it opens the way for the conversion of recalcitrant biomasses, generally not fully exploitable by anaerobic digestion systems. Additionally, this biological process presents several advantages over its analogous process of catalytic methanation such as the use of inexpensive biocatalysts, milder operational conditions, higher tolerance to the impurities of syngas, and higher product selectivity. However, there are still several challenges to be addressed for this technology to reach commercial stage. This work reviews the progress made over the last few years in syngas biomethanation processes in order to provide an overview of the current state of the art of this technology. The most relevant aspects determining the performance of syngas biomethanation processes are extensively discussed here, including microbial diversity and metabolic interactions in mixed microbial consortia, the infl uence of operating parameters and bioreactor designs, and the potential of modelling as a tool for the design and control of this bioprocess.

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Section: Introductionmentioning

confidence: 99%

Syngas biomethanation: state‐of‐the‐art review and perspectives

Grimalt‐Alemany

Skiadas

Gavala

2017

Biofuels Bioprod Bioref

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“…As discussed above, the P7 strain has been mainly tested on syngas fermentation. Compared with the sugar platform where lignocelluosic biomass is pretreated and hydrolyzed to release sugars for microbial fermentation, the syngas platform employs less steps and is able to accommodate different biomass waste materials [29]. However, besides costs associated with high temperatures needed for gasification, syngas fermentation releases a gas stream containing a higher CO 2 concentration than the input syngas.…”

Section: Discussionmentioning

confidence: 99%

EMS-Induced Mutagenesis of Clostridium carboxidivorans for Increased Atmospheric CO2 Reduction Efficiency and Solvent Production

et al. 2020

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Clostridium carboxidivorans (P7) is one of the most important solvent-producing bacteria capable of fermenting syngas (CO, CO2, and H2) to produce chemical commodities when grown as an autotroph. This study aimed to develop ethyl methanesulfonate (EMS)-induced P7 mutants that were capable of growing in the presence of CO2 as a unique source of carbon with increased solvent formation and atmospheric CO2 reduction to limit global warming. Phenotypic analysis including growth and end product characterization of the P7 wild type (WT) demonstrated that this strain grew better at 25 °C than 37 °C when CO2 served as the only source of carbon. In the current study, 55 mutagenized P7-EMS mutants were developed by using 100 mM and 120 mM EMS. Interestingly, using a forward genetic approach, three out of the 55 P7-EMS mutants showed a significant increase in ethanol, butyrate, and butanol production. The three P7-EMS mutants presented on average a 4.68-fold increase in concentrations of ethanol when compared to the P7-WT. Butyric acid production from 3 P7-EMS mutants contained an average of a 3.85 fold increase over the levels observed in the P7-WT cultures under the same conditions (CO2 only). In addition, one P7-EMS mutant presented butanol production (0.23 ± 0.02 g/L), which was absent from the P7-WT under CO2 conditions. Most of the P7-EMS mutants showed stability of the obtained end product traits after three transfers. Most importantly, the amount of reduced atmospheric CO2 increased up to 8.72 times (0.21 g/Abs) for ethanol production and up to 8.73 times higher (0.16 g/Abs) for butyrate than the levels contained in the P7-WT. Additionally, to produce butanol, the P7-EMSIII-J mutant presented 0.082 g/Abs of CO2 reduction. This study demonstrated the feasibility and effectiveness of employing EMS mutagenesis in generating solvent-producing anaerobic bacteria mutants with improved and novel product formation and increased atmospheric CO2 reduction efficiency.

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“…Furthermore, another second-generation biofuel is bio-SNG, a synthetic gas similar to natural gas [40]. Straw and other plant residue produces synthetic gas involving a several thermochemical stages.…”

Section: Generation Of Biofuelsmentioning

confidence: 99%

An Overview on Biofuels and Their Advantages and Disadvantages

2019

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Biofuels are mainly obtained from biological materials, mostly from plants, animals, wastes and microorganisms [1]. Biomass is organic components are the source of substitute energy and it contains all classes of biofuels like solid, gaseous and liquid fuels. These can be achieved from biomass [2,3]. Biomass for alternative energy might be engaged in various ways. An outline of the different possible options to use biomass [4] is presented in Scheme-I. Solid biofuels are mostly firewood, charcoal and fibrous matters. Fossil fuels like firewood and charcoal are extensively utilized as a primary fuel domiciliary purpose that is cooking. Fibrous type of material can be obtained from sugar cane processing and it is widely used for power generation and preparation of steam [5]. Methane and producer gases are mainly the gaseous biofuels and these can be obtained by fermentation of domestic animal wastes and from the pyrolysis [6] or gasification of agricultural wastes and wood. Different kind of liquid biofuels like methanol, ethanol, organic oils and the methyl esters are generally attributed as biodiesel [7]. Solids and liquids biofuels are used

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Conversion of Biomass-Generated Syngas into Next-Generation Liquid Transport Fuels through Microbial Intervention: Potential and Current Status

Cited by 24 publications

References 0 publications

Syngas biomethanation: state‐of‐the‐art review and perspectives

Syngas biomethanation: state‐of‐the‐art review and perspectives

EMS-Induced Mutagenesis of Clostridium carboxidivorans for Increased Atmospheric CO2 Reduction Efficiency and Solvent Production

An Overview on Biofuels and Their Advantages and Disadvantages

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