{"refrec":{"BRefID":361338,"RR":"<b>Zhang, X.; Arbour, T.; Zhang, D.; Wei, S.; Rabaey, K.</b> (2023). Microbial electrosynthesis of acetate from CO<sub>2</sub> under hypersaline conditions. <i>Environmental Science and Ecotechnology 13</i>: 100211. <a href=\"https://dx.doi.org/10.1016/j.ese.2022.100211\" target=\"_blank\">https://dx.doi.org/10.1016/j.ese.2022.100211</a>","BEntID":359053,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Environmental Science and Ecotechnology 13</i>: 100211. <a href=\"https://dx.doi.org/10.1016/j.ese.2022.100211\" target=\"_blank\">https://dx.doi.org/10.1016/j.ese.2022.100211</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Zhang, X.; Arbour, T.; Zhang, D.; Wei, S.; Rabaey, K.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Zhang, X. <i>et al.</i>","Englishabstract":"Microbial electrosynthesis (MES) enables the bioproduction of multicarbon compounds from CO<sub>2</sub> using electricity as the driver. Although high salinity can improve the energetic performance of bioelectrochemical systems, acetogenic processes under elevated salinity are poorly known. Here MES under 35–60 g L<sup>−1</sup> salinity was evaluated. Acetate production in two-chamber MES systems at 35 g L<sup>−1</sup> salinity (seawater composition) gradually decreased within 60 days, both under −1.2 V cathode potential (vs. Ag/AgCl) and −1.56 A m<sup>−2</sup> reductive current. Carbonate precipitation on cathodes (mostly CaCO<sub>3</sub>) likely declined the production through inhibiting CO<sub>2</sub> supply, the direct electrode contact for acetogens and H<sub>2</sub> production. Upon decreasing Ca<sup>2+</sup> and Mg<sup>2+</sup> levels in three-chamber reactors, acetate was stably produced over 137 days along with a low cathode apparent resistance at 1.9 ± 0.6 mΩ m<sup>2</sup> and an average production rate at 3.80 ± 0.21 g m<sup>−2</sup> d<sup>−1</sup>. Increasing the salinity step-wise from 35 to 60 g L<sup>−1</sup> gave the most efficient acetate production at 40 g L<sup>−1</sup> salinity with average rates of acetate production and CO<sub>2</sub> consumption at 4.56 ± 3.09 and 7.02 ± 4.75 g m<sup>−2</sup> d<sup>−1</sup>, respectively. The instantaneous coulombic efficiency for VFA averaged 55.1 ± 31.4%. Acetate production dropped at higher salinity likely due to the inhibited CO<sub>2</sub> dissolution and acetogenic metabolism. <em>Acetobacterium</em> up to 78% was enriched on cathodes as the main acetogen at 35 g L<sup>−1</sup>. Under high-salinity selection, 96.5% <em>Acetobacterium</em> dominated on the cathode along with 34.0% <em>Sphaerochaeta</em> in catholyte. This research provides a first proof of concept that MES starting from CO<sub>2</sub> reduction can be achieved at elevated salinity.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Microbial electrosynthesis of acetate from CO<sub>2</sub> under hypersaline conditions","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Carbon capture and utilization; High salinity; Carbonate precipitates; Acetogenesis; Marine bacteria","OtherDescriptors":null,"Notes":null,"AnaPub":2023,"MonPub":null,"DateUpdate":"2023-05-17","DateCreate":"2023-02-23","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000907650600005","VABBcode":null,"OpenAcc":1,"DOI":"10.1016/j.ese.2022.100211"},"refs":null,"anarec":{"AnaID":361338,"PubliDate":2023,"Pagination":"100211","XtraPublOfAnaID":null,"ISBN":null,"Volume":"13","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":361375,"SerRR":"Environmental Science and Ecotechnology. 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