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Anaerobic digestion of food waste to volatile fatty acids and hydrogen at high organic loading rates in immersed membrane bioreactors
University of Borås, Faculty of Textiles, Engineering and Business. (Resource Recovery)
University of Borås, Faculty of Textiles, Engineering and Business.
University of Borås, Faculty of Textiles, Engineering and Business.ORCID iD: 0000-0002-1456-1840
University of Borås, Faculty of Textiles, Engineering and Business.ORCID iD: 0000-0003-4887-2433
2020 (English)In: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682Article 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]

The organic loading rate (OLR) is an essential parameter that controls the anaerobic digestion process. This work investigated the performance of immersed membrane bioreactors operated at high OLRs of 4, 6, 8 and 10 g volatile solids (VS)/L/d regarding the fermentation behavior, product recovery and microbial dynamics during the acidogenic fermentation of food waste to volatile fatty acids (VFAs) and hydrogen. The highest yield of 0.52 g VFA/ gVSadded was attained at 6 g VS/L/d, while an optimal hydrogen yield of 14.7 NmL/ gVSadded was obtained at 8 g VS/L/d. The bacterial populations, analyzed using 16S rRNA gene amplicon sequencing, consisted mainly of Firmicutes and Actinobacteria at OLRs 4 and 8 g VS/L/d while Firmicutes, Actinobacteria and Proteobacteria phyla dominated at 6 and 10 g VS/L/d. Moreover, the presence of Clostridium and Lactobacillus genera correlated with the acetate, butyrate, caproate and lactate production.

Place, publisher, year, edition, pages
2020.
Keywords [en]
In-situ product recovery Immersed membrane bioreactor High organic loading rate Volatile fatty acids Microbial dynamics
National Category
Engineering and Technology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-22766DOI: 10.1016/j.renene.2020.01.138OAI: oai:DiVA.org:hb-22766DiVA, id: diva2:1390744
Funder
Swedish Agency for Economic and Regional GrowthMoRe ResearchSwedish Research CouncilAvailable from: 2020-02-03 Created: 2020-02-03 Last updated: 2020-02-24Bibliographically approved

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Wainaina, StevenMukesh Kumar, AwasthiSárvári Horváth, IlonaTaherzadeh, Mohammad J

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Renewable energy
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