Microbial electrosynthesis of acetate from CO2 under hypersaline conditions
Microbial electrosynthesis (MES) enables the bioproduction of multicarbon compounds from CO2 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 35–6...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-01-01
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| Series: | Environmental Science and Ecotechnology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666498422000679 |
| _version_ | 1827998845512974336 |
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| author | Xiaoting Zhang Tyler Arbour Daijun Zhang Shiqiang Wei Korneel Rabaey |
| author_facet | Xiaoting Zhang Tyler Arbour Daijun Zhang Shiqiang Wei Korneel Rabaey |
| author_sort | Xiaoting Zhang |
| collection | DOAJ |
| description | Microbial electrosynthesis (MES) enables the bioproduction of multicarbon compounds from CO2 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−1 salinity was evaluated. Acetate production in two-chamber MES systems at 35 g L−1 salinity (seawater composition) gradually decreased within 60 days, both under −1.2 V cathode potential (vs. Ag/AgCl) and −1.56 A m−2 reductive current. Carbonate precipitation on cathodes (mostly CaCO3) likely declined the production through inhibiting CO2 supply, the direct electrode contact for acetogens and H2 production. Upon decreasing Ca2+ and Mg2+ 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 m2 and an average production rate at 3.80 ± 0.21 g m−2 d−1. Increasing the salinity step-wise from 35 to 60 g L−1 gave the most efficient acetate production at 40 g L−1 salinity with average rates of acetate production and CO2 consumption at 4.56 ± 3.09 and 7.02 ± 4.75 g m−2 d−1, respectively. The instantaneous coulombic efficiency for VFA averaged 55.1 ± 31.4%. Acetate production dropped at higher salinity likely due to the inhibited CO2 dissolution and acetogenic metabolism. Acetobacterium up to 78% was enriched on cathodes as the main acetogen at 35 g L−1. Under high-salinity selection, 96.5% Acetobacterium dominated on the cathode along with 34.0% Sphaerochaeta in catholyte. This research provides a first proof of concept that MES starting from CO2 reduction can be achieved at elevated salinity. |
| first_indexed | 2024-04-10T05:49:01Z |
| format | Article |
| id | doaj.art-d8e1b6b8d2794aebad74e401f8bef46c |
| institution | Directory Open Access Journal |
| issn | 2666-4984 |
| language | English |
| last_indexed | 2024-04-10T05:49:01Z |
| publishDate | 2023-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Environmental Science and Ecotechnology |
| spelling | doaj.art-d8e1b6b8d2794aebad74e401f8bef46c2023-03-05T04:25:45ZengElsevierEnvironmental Science and Ecotechnology2666-49842023-01-0113100211Microbial electrosynthesis of acetate from CO2 under hypersaline conditionsXiaoting Zhang0Tyler Arbour1Daijun Zhang2Shiqiang Wei3Korneel Rabaey4College of Resources and Environment, Southwest University, Chongqing, 400715, China; Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, 9000, Ghent, BelgiumCenter for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, 9000, Ghent, BelgiumState Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, ChinaCollege of Resources and Environment, Southwest University, Chongqing, 400715, ChinaCenter for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, 9000, Ghent, Belgium; Center for Advanced Process Technology for Urban Resource Recovery (CAPTURE), Frieda Saeysstraat 1, 9052, Ghent, Belgium; Corresponding author. Center for Microbial Ecology and Technology - FBE - Ghent University, Belgium.Microbial electrosynthesis (MES) enables the bioproduction of multicarbon compounds from CO2 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−1 salinity was evaluated. Acetate production in two-chamber MES systems at 35 g L−1 salinity (seawater composition) gradually decreased within 60 days, both under −1.2 V cathode potential (vs. Ag/AgCl) and −1.56 A m−2 reductive current. Carbonate precipitation on cathodes (mostly CaCO3) likely declined the production through inhibiting CO2 supply, the direct electrode contact for acetogens and H2 production. Upon decreasing Ca2+ and Mg2+ 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 m2 and an average production rate at 3.80 ± 0.21 g m−2 d−1. Increasing the salinity step-wise from 35 to 60 g L−1 gave the most efficient acetate production at 40 g L−1 salinity with average rates of acetate production and CO2 consumption at 4.56 ± 3.09 and 7.02 ± 4.75 g m−2 d−1, respectively. The instantaneous coulombic efficiency for VFA averaged 55.1 ± 31.4%. Acetate production dropped at higher salinity likely due to the inhibited CO2 dissolution and acetogenic metabolism. Acetobacterium up to 78% was enriched on cathodes as the main acetogen at 35 g L−1. Under high-salinity selection, 96.5% Acetobacterium dominated on the cathode along with 34.0% Sphaerochaeta in catholyte. This research provides a first proof of concept that MES starting from CO2 reduction can be achieved at elevated salinity.http://www.sciencedirect.com/science/article/pii/S2666498422000679Carbon capture and utilizationHigh salinityCarbonate precipitatesAcetogenesisMarine bacteria |
| spellingShingle | Xiaoting Zhang Tyler Arbour Daijun Zhang Shiqiang Wei Korneel Rabaey Microbial electrosynthesis of acetate from CO2 under hypersaline conditions Environmental Science and Ecotechnology Carbon capture and utilization High salinity Carbonate precipitates Acetogenesis Marine bacteria |
| title | Microbial electrosynthesis of acetate from CO2 under hypersaline conditions |
| title_full | Microbial electrosynthesis of acetate from CO2 under hypersaline conditions |
| title_fullStr | Microbial electrosynthesis of acetate from CO2 under hypersaline conditions |
| title_full_unstemmed | Microbial electrosynthesis of acetate from CO2 under hypersaline conditions |
| title_short | Microbial electrosynthesis of acetate from CO2 under hypersaline conditions |
| title_sort | microbial electrosynthesis of acetate from co2 under hypersaline conditions |
| topic | Carbon capture and utilization High salinity Carbonate precipitates Acetogenesis Marine bacteria |
| url | http://www.sciencedirect.com/science/article/pii/S2666498422000679 |
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