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Gas Fermentation for Commodity Chemicals and Fuels bs_bs_banner Gas fermentation for commodity chemicals and fuels Frank R. Bengelsdorf and Peter Durre*€ facilities with considerable amounts of exhaust waste Institut fur€ Mikrobiologie und Biotechnologie, Universitat€ gases. The use of this autotrophic acetogenic biocatalyst Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany. enables the sustainable consumption of CO and CO2 and provides sustainable production patterns of com- modity chemicals or fuels (goal 12). Summary The syngas fermentation technology is expected to achieve a breakthrough once the industrial-scale facility Gas fermentation is a microbial process that contri- in Ghent is operating and producing 47 000 tons of etha- butes to at least four of the sustainable development nol per annum from waste gases originating from the goals (SDGs) of the United Nations. The process steelmaking process. Within the next 10 years, this tech- converts waste and greenhouse gases into commod- nology has the potential to build up a resilient infrastruc- ity chemicals and fuels. Thus, world’s climate is ture to capture GHG emissions from industrial waste gas positively affected. Briefly, we describe the back- streams, to promote sustainable industrialization by pro- ground of the process, some biocatalytic strains, ducing valued products and foster innovation in this field and legal implications. (goal 9). Currently, two of the greatest challenges facing industry Gas fermentation will also provide jobs and further and society are the future sustainable production of career opportunities in academic and industrial bodies. chemicals and fuels from non-food resources while at Academia needs to train a cadre of researchers, able to the same time reducing Greenhouse gas (GHG) emis- apply their skills to the future societal challenges facing sions. The whole world needs to build a low-carbon and the world. Gas fermentation will also provide cutting climate-resilient industrial environment by moving away edge technology to innovative enterprises all over the from fossil fuels and investing in clean chemical and world. This might not be trivial, as competitors of Lan- energy generation. Faced with this challenge, gas fer- zaTech, namely INEOS Bio and Coskata, already strug- mentation represents a disruptive technology that will gled on their route to establish an industrial-scale biofuel bring transformational changes to industry and society production facility. However, it sets an ambitious goal (Fig. 1). Bacterial synthesis gas (syngas) fermentation is which needs to be reached in order to maintain industrial a microbial process that contributes to goals of the 2030 and living standards on a planet with limited resources. agenda for sustainable development (www.un.org/ga/sea Gas fermentation also provides novel opportunities for rch/view_doc.asp?symbol=A/RES/70/1&Lang=E). In this renewable energy (goal 7). Currently, electricity prices microbial process, GHG such as carbon monoxide (CO) face negative values, when too much wind or solar and carbon dioxide (CO2) are fixed by a biocatalyst that energy is fed into the grid. This surplus electricity could simultaneously produces commodity chemicals or fuels. be used for hydrogen generation by electrolysis of water. In 2015, the companies LanzaTech, ArcelorMittal and Although generally considered to be an uneconomic pro- Primetals Technologies set up a corporation to build an cess, it could help in such peak times to reduce carbon industrial-scale ethanol production facility in Ghent, Bel- dioxide with help of hydrogen to produce industrially gium (LanzaTech, 2015). The syngas fermentation tech- high-value chemicals by acetogenic bacteria. Thus, sur- nology has the potential to take urgent action to combat plus electricity from renewable resources can be used climate change and its impacts (goal 13) by reducing for production of platform chemicals with simultaneous GHG emissions, if applied at industrial-scale in several reduction in GHG. Here, we outline the background and recent develop- ments in the field of bacterial syngas fermentation. Syn- Received 6 June, 2017; accepted 7 June, 2017. fi *For correspondence. E-mail [email protected]; Tel. +49 731 gas can have multiple origins, e.g. (i) gasi cation of coal, 5022710; Fax +49 731 5022719. petroleum, natural gas and peat coak; (ii) certain indus- Microbial Biotechnology (2017) 10(5), 1167–1170 trial waste gas streams; (iii) gasification of solid waste doi:10.1111/1751-7915.12763 fi Funding Information and (iv) pyrolysis/gasi cation of solid biomass. Legally, Work in the authors’ laboratory was and is supported by grants from only syngas from solid biomass can be considered as the BMBF project Gas-Fermentation (FKZ 031A468A), the ERA IB ‘green carbon’. If fossil sources, or products made from 5 Program, project CO2CHEM (FKZ 031A366A), and the ERA IB 7 Program, project OBAC (FKZ 031 B0274B). fossil sources, were used to generate syngas, it has to be considered as ‘black carbon’. However, the amounts ª 2017 The Authors. Microbial Biotechnology published by John Wiley & Sons Ltd and Society for Applied Microbiology. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. 1168 F. R. Bengelsdorf and P. Durre€ Green carbon Black carbon CO CO CO 2 CO2 H 2 CO 2 CO2 2 Greenhouse Gas (GHG) emissions Solid biomass Heavy Gasification of Biorefineries industry fossil sources Fast pyrolysis Synthesis gas (syngas) fermentation H2O CO2 CO H H2 2 Biocatalysts Acetobacterium woodii Moorella thermoacetica Clostridium ljungdahlii Clostridium autoethanogenum Natural products Recombinant products Natural product Recombinant product •Acetone • Ethanol •Butanol •Acetate •Butyrate •Acetate •Lactate • 2,3-Butanediol • 3-Hydroxybutyrate • Lactate • Isopropanol Fig. 1. Graphical abstract of the gas fermentation process and links to sustainable development goals. of syngas derived from fossil sources outnumber the butyrate, hexanoate, 2,3 butanediol and acetone using amounts generated via pyrolysis or gasification of solid syngas as carbon and energy source. Wood–Ljungdahl biomass (Dahmen et al., 2017). Especially, the gasifica- pathway is a synonym of acetyl-CoA pathway, and the tion of fossil sources is a well-established process and respective biochemistry has been elucidated in a number the world gasification industry is growing rapidly as indi- of recent reviews (Drake et al., 2008; Ragsdale, 2008; cated in the ‘Worldwide Syngas Database’ (http:// Schuchmann and Muller,€ 2014). All acetogens produce www.gasification-syngas.org/resources/world-gasifica acetic acid as metabolic end-product because the pro- tion-database/). The database provides information duction contributes significantly to the energy conversion about plant locations, number and type of gasifiers, syn- processes of the cells. A further important energy con- gas capacity, feedstock and products. In 2015, global version is realized by building up a sodium ion or proton syngas output was 148 gigawatts thermal (GWth) and if gradient over the cell membrane that is finally used to all upcoming plans are realized, the worldwide syngas drive enzymes called ATPases that generate adenosine capacity will increase up to 300 GWth in 2020. The data- triphosphate (ATP), which is the energy currency of life. base does not consider ‘industrial waste gas’ or any Some acetogens such as Clostridium ljungdahlii, other relevant energy rich waste gas output. Clostridium autoethanogenum or Clostridium carboxidi- The used biocatalysts (also called acetogens) are vorans are of special interest, as they can produce anaerobic bacteria that employ the reductive acetyl-CoA valuable metabolic products as indicated above. pathway to fix CO and/or CO2 and subsequently pro- Clostridium ljungdahlii and C. autoethanogenum are the duce biofuels such as ethanol, butanol or hexanol as best studied organisms with respect to possible applica- well as biocommodities such as acetate, lactate, tions in syngas fermentation processes. They share a ª 2017 The Authors. Microbial Biotechnology published by John Wiley & Sons Ltd and Society for Applied Microbiology, Microbial Biotechnology, 10, 1167–1170 Bacterial syngas fermentation and SDGs 1169 special metabolic feature that enables them to convert the conversion! This clearly will hamper companies, the compulsorily produced acetate completely into the which are introducing the cutting edge technology of gas valuable product ethanol (Abubackar et al., 2016). Fur- fermentation and are looking for financial benefits of thermore, both bacterial strains are closely related to qualifying under today’s biofuels legislation, both in Eur- each other and have the tremendous advantage that ope and the USA. Thus, scientists need to emphasize they are genetically accessible (Bengelsdorf et al., that such misleading regulations should be corrected, in 2016). Thus, metabolic engineering of the bacterial cells scientific publications as well as in information to is feasible and several recombinant strains have been politicians. constructed that produce biocommodities such as iso- propanol, butyrate, butanol and 3-hydroxybutyrate (Liew Conflict of interest et al., 2016). Clostridium carboxidivorans is of interest because it None declared. produces hexanol and hexanoic acid from syngas natively, which was shown simultaneously by two dif- References ferent groups (Phillips et al.,2015;Ramio-Pujol et al., 2015). As this bacterium
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