Journal
RENEWABLE ENERGY
Volume 152, Issue -, Pages 1140-1148Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2020.01.138
Keywords
In-situ product recovery; Immersed membrane bioreactor; High organic loading rate; Volatile fatty acids; Microbial dynamics
Funding
- Swedish Research Council
- Swedish Agency for Economic and Regional Growth (Till_vaxtverket) through a European Regional Development Fund
- Mobility for Regional Excellence-2020 [RUN 2017-00771]
- European Union's Horizon 2020 Research and Innovation Programme under the Marie Sklodowska-Curie grant [754412]
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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/gVS(added) was attained at 6 g VS/L/d, while an optimal hydrogen yield of 14.7 NmL/gVS(added) 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. (c) 2020 Elsevier Ltd. All rights reserved.
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