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Bioengineering of anaerobic digestion for volatile fatty acids, hydrogen or methane production: A critical review
University of Borås, Faculty of Textiles, Engineering and Business.ORCID iD: 0000-0002-7387-2358
University of Borås, Faculty of Textiles, Engineering and Business.
University of Borås, Faculty of Textiles, Engineering and Business.ORCID iD: 0000-0003-4887-2433
2019 (English)In: Bioengineered, ISSN 2165-5979, E-ISSN 2165-5987, ISSN 2165-5979Article in journal (Refereed) Published
Sustainable development
According to the author(s), the content of this publication falls within the area of sustainable development.
Abstract [en]

Anaerobic digestion (AD) is a well-established technology used for producing biogas or biomethane alongside the slurry used as biofertilizer. However, using a variety of wastes and residuals as substrate and mixed cultures in the bioreactor makes AD as one of the most complicated biochemical processes employing hydrolytic, acidogenic, hydrogen-producing, acetate-forming bacteria as well as acetoclastic and hydrogenoclastic methanogens. Hydrogen and volatile fatty acids (VFAs) including acetic, propionic, isobutyric, butyric, isovaleric, valeric and caproic acid and other carboxylic acids such as succinic and lactic acids are formed as intermediate products. As these acids are important precursors for various industries as mixed or purified chemicals, the AD process can be bioengineered to produce VFAs alongside hydrogen and therefore biogas plants can become biorefineries. The current critical review paper provides the theory and means to produce and accumulate VFAs and hydrogen, inhibit their conversion to methane and to extract them as the final products. The effects of pretreatment, pH, temperature, hydraulic retention time (HRT), organic loading rate (OLR), chemical methane inhibitions, and heat shocking of the inoculum on VFAs accumulation, hydrogen production, VFAs composition, and the microbial community were discussed. Furthermore, this paper highlights the possible techniques for recovery of VFAs from the fermentation media in order to minimize product inhibition as well as to supply the carboxylates for downstream procedures.

Place, publisher, year, edition, pages
Taylor & Francis Group, 2019.
Keywords [en]
Anaerobic digestion, Metabolic pathways, Volatile fatty acids, Hydrogen, Biorefineries, Process parameters, Mixed culture fermentation, Inhibiting methanogens
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:hb:diva-21807DOI: 10.1080/21655979.2019.1673937OAI: oai:DiVA.org:hb-21807DiVA, id: diva2:1357122
Funder
Swedish Research CouncilMoRe ResearchSwedish Agency for Economic and Regional GrowthAvailable from: 2019-10-03 Created: 2019-10-03 Last updated: 2019-10-08Bibliographically approved

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Wainaina, StevenLukitawesa, LukitawesaMukesh Kumar, AwasthiTaherzadeh, Mohammad J

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