Microbial Production of Value-Added Chemicals from Pyrolysis Oil and Syngas

Neumann, Anke; Dörsam, Stefan; Oswald, Florian; Ochsenreither, Katrin

doi:10.1007/978-94-017-7475-8_4

Cited by 7 publications

(9 citation statements)

References 136 publications

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“…Conversion of other gaseous carbon sources (e.g. CO 2 ) in BESs has been extensively presented [93,[98][99][100], whereas a syngas-fed BESs represents a novel approach.…”

Section: Current Bottlenecks Of Co/syngas Conversion In Bess and Future Trendsmentioning

confidence: 99%

Bioelectrochemical systems (BESs) towards conversion of carbon monoxide/syngas: A mini-review

Barbosa

Peixoto

Alves

et al. 2021

Renewable and Sustainable Energy Reviews

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Microbial conversion of carbon monoxide (CO)/syngas has been extensively investigated. The microbial conversion of CO/syngas offers numerous advantages over chemically catalyzed processes e.g. the specificity of the biocatalysts, the operation at ambient conditions and high conversion efficiencies. Bioelectrochemical systems (BESs) exploit the capacity of electrochemically active bacteria (EAB) to use insoluble electron acceptors or donors to produce electricity or added-value compounds. Electricity production from different organic sources in BESs has been broadly demonstrated, whereas electricity production from CO/syngas has been very little reported. Acetate oxidation by a consortium of carboxydotrophic and CO-tolerant EAB has been suggested to be the main pathway responsible for indirect electricity generation from CO/syngas. Although electricity production in BESs from several organic sources has been widely investigated, the interest on BESs research is currently moving to the production of added-value compounds by electro-fermentation (EF) processes. EF allows to modify redox balances by the use of electric circuits to fine tune metabolic pathways towards obtaining products with high economic value. Although EF has been widely studied, the potential of use CO-rich gas streams as substrate has been under explored. This review presents and discusses current advances on microbial conversion of CO/syngas in BESs.

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“…Conversion of other gaseous carbon sources (e.g. CO 2 ) in BESs has been extensively presented [93,[98][99][100], whereas a syngas-fed BESs represents a novel approach.…”

Section: Current Bottlenecks Of Co/syngas Conversion In Bess and Future Trendsmentioning

confidence: 99%

Bioelectrochemical systems (BESs) towards conversion of carbon monoxide/syngas: A mini-review

Barbosa

Peixoto

Alves

et al. 2021

Renewable and Sustainable Energy Reviews

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“…Therefore, C 2 -molecules are the preferred products with reported concentrations of up to 44 g/L (Demler and Weuster-Botz, 2011 ). Reported concentrations for butyrate, butanol and 2,3-butanediol are low compared to acetic acid (Neumann et al, 2015 ). More details about the metabolism of acetogenic bacteria can be found in Schuchmann and Müller ( 2014 ) or Bengelsdorf et al ( 2013 ).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, this study focuses on broadening the substrate spectrum for production of malic acid or any other biotechnological product beyond glycerol and sugars and simultaneously expanding the product spectrum of syngas fermentation. By sequential coupling of anaerobic syngas fermentation and aerobic malic acid production the substrate spectrum is broadened to syngas, which can be obtained from steel mill off-gas (Köpke et al, 2011 ) or by gasification of biomass organic wastes and fossil feedstocks (Neumann et al, 2015 ), forging a completely new and highly innovative path toward the establishment of a biobased economy.…”

Section: Introductionmentioning

confidence: 99%

Sequential Mixed Cultures: From Syngas to Malic Acid

et al. 2016

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Synthesis gas (syngas) fermentation using acetogenic bacteria is an approach for production of bulk chemicals like acetate, ethanol, butanol, or 2,3-butandiol avoiding the fuel vs. food debate by using carbon monoxide, carbon dioxide, and hydrogen from gasification of biomass or industrial waste gases. Suffering from energetic limitations, yields of C4-molecules produced by syngas fermentation are quite low compared with ABE fermentation using sugars as a substrate. On the other hand, fungal production of malic acid has high yields of product per gram metabolized substrate but is currently limited to sugar containing substrates. In this study, it was possible to show that Aspergilus oryzae is able to produce malic acid using acetate as sole carbon source which is a main product of acetogenic syngas fermentation. Bioreactor cultivations were conducted in 2.5 L stirred tank reactors. During the syngas fermentation part of the sequential mixed culture, Clostridium ljungdahlii was grown in modified Tanner medium and sparged with 20 mL/min of artificial syngas mimicking a composition of clean syngas from entrained bed gasification of straw (32.5 vol-% CO, 32.5 vol-% H2, 16 vol-% CO2, and 19 vol-% N2) using a microsparger. Syngas consumption was monitored via automated gas chromatographic measurement of the off-gas. For the fungal fermentation part gas sparging was switched to 0.6 L/min of air and a standard sparger. Ammonia content of medium for syngas fermentation was reduced to 0.33 g/L NH4Cl to meet the requirements for fungal production of dicarboxylic acids. Malic acid production performance of A. oryzae in organic acid production medium and syngas medium with acetate as sole carbon source was verified and gave YP∕S values of 0.28 g/g and 0.37 g/g respectively. Growth and acetate formation of C. ljungdahlii during syngas fermentation were not affected by the reduced ammonia content and 66 % of the consumed syngas was converted to acetate. The overall conversion of CO and H2 into malic acid was calculated to be 3.5 g malic acid per mol of consumed syngas or 0.22 g malic acid per gram of syngas.

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“…It is assumed that all commercially used acetogens produce ethanol via this AOR pathway as it is more energy efficient (first formation of ATP by acetate production, then formation of acetaldehyde and ethanol) [125]. Products other than acetate and ethanol are thermodynamically very difficult, since for mechanistic and thermodynamic reasons only less than 1 ATP can be formed per organic acid produced [126].…”

Section: Reaction Mechanismmentioning

confidence: 99%

CO_x Fixation to Elementary Building Blocks: Anaerobic Syngas Fermentation vs. Chemical Catalysis

Perret

Campos

Delgado

et al. 2022

Chemie Ingenieur Technik

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Heterogeneous catalysis and anaerobic syngas fermentation represent two different approaches for the conversion of synthesis gas into chemicals and fuels. This review provides a unique comparison of different reaction paths for the fixation of CO 2 , CO and H 2 into elementary building blocks such as methanol, acetic acid and ethanol. Operating conditions, reactor engineering, influence of gas impurities, yields, conversion efficiencies as well as downstream product recovery are compared. It was found that mass-specific productivity ranges in the same order of magnitude for both technologies, while space-time yield of heterogeneous catalysis is up to three orders of magnitude higher.

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Microbial Production of Value-Added Chemicals from Pyrolysis Oil and Syngas

Cited by 7 publications

References 136 publications

Bioelectrochemical systems (BESs) towards conversion of carbon monoxide/syngas: A mini-review

Bioelectrochemical systems (BESs) towards conversion of carbon monoxide/syngas: A mini-review

Sequential Mixed Cultures: From Syngas to Malic Acid

CO_x Fixation to Elementary Building Blocks: Anaerobic Syngas Fermentation vs. Chemical Catalysis

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Microbial Production of Value-Added Chemicals from Pyrolysis Oil and Syngas

Cited by 7 publications

References 136 publications

Bioelectrochemical systems (BESs) towards conversion of carbon monoxide/syngas: A mini-review

Bioelectrochemical systems (BESs) towards conversion of carbon monoxide/syngas: A mini-review

Sequential Mixed Cultures: From Syngas to Malic Acid

COx Fixation to Elementary Building Blocks: Anaerobic Syngas Fermentation vs. Chemical Catalysis

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Product

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CO_x Fixation to Elementary Building Blocks: Anaerobic Syngas Fermentation vs. Chemical Catalysis