Increasing Desalination by Mitigating Anolyte pH Imbalance Using Catholyte Effluent Addition in a Multi-Anode Bench Scale Microbial Desalination Cell

Handle URI:
http://hdl.handle.net/10754/598611
Title:
Increasing Desalination by Mitigating Anolyte pH Imbalance Using Catholyte Effluent Addition in a Multi-Anode Bench Scale Microbial Desalination Cell
Authors:
Davis, Robert J.; Kim, Younggy; Logan, Bruce E.
Abstract:
A microbial desalination cell (MDC) uses exoelectrogenic bacteria to oxidize organic matter while desalinating water. Protons produced from the oxidation of organics at the anode result in anolyte acidification and reduce performance. A new method was used here to mitigate anolyte acidification based on adding non-buffered saline catholyte effluent from a previous cycle to the anolyte at the beginning of the next cycle. This method was tested using a larger-scale MDC (267 mL) containing four anode brushes and a three cell pair membrane stack. With an anolyte salt concentration increased by an equivalent of 75 mM NaCl using the catholyte effluent, salinity was reduced by 26.0 ± 0.5% (35 g/L NaCl initial solution) in a 10 h cycle, compared to 18.1 ± 2.0% without catholyte addition. This improvement was primarily due to the increase in buffering capacity of the anolyte, although increased conductivity slightly improved performance as well. There was some substrate loss from the anolyte by diffusion into the membrane stack, but this was decreased from 11% to 2.6% by increasing the anolyte conductivity (7.6 to 14 mS/cm). These results demonstrated that catholyte effluent can be utilized as a useful product for mitigating anolyte acidification and improving MDC performance. © 2013 American Chemical Society.
Citation:
Davis RJ, Kim Y, Logan BE (2013) Increasing Desalination by Mitigating Anolyte pH Imbalance Using Catholyte Effluent Addition in a Multi-Anode Bench Scale Microbial Desalination Cell. ACS Sustainable Chem Eng 1: 1200–1206. Available: http://dx.doi.org/10.1021/sc400148j.
Publisher:
American Chemical Society (ACS)
Journal:
ACS Sustainable Chemistry & Engineering
KAUST Grant Number:
KUS-11-003-13
Issue Date:
3-Sep-2013
DOI:
10.1021/sc400148j
Type:
Article
ISSN:
2168-0485; 2168-0485
Sponsors:
The authors thank Siemens Corp. for kindly donating an electrodialysis reactor as a design reference for this project, Hiroyuki Kashima for his help with ion chromatography, and Dr. Xiuping Zhu for conducting the HPLC analysis. This research was supported by Award KUS-11-003-13 from the King Abdullah University of Science and Technology (KAUST).
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorDavis, Robert J.en
dc.contributor.authorKim, Younggyen
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2016-02-25T13:33:05Zen
dc.date.available2016-02-25T13:33:05Zen
dc.date.issued2013-09-03en
dc.identifier.citationDavis RJ, Kim Y, Logan BE (2013) Increasing Desalination by Mitigating Anolyte pH Imbalance Using Catholyte Effluent Addition in a Multi-Anode Bench Scale Microbial Desalination Cell. ACS Sustainable Chem Eng 1: 1200–1206. Available: http://dx.doi.org/10.1021/sc400148j.en
dc.identifier.issn2168-0485en
dc.identifier.issn2168-0485en
dc.identifier.doi10.1021/sc400148jen
dc.identifier.urihttp://hdl.handle.net/10754/598611en
dc.description.abstractA microbial desalination cell (MDC) uses exoelectrogenic bacteria to oxidize organic matter while desalinating water. Protons produced from the oxidation of organics at the anode result in anolyte acidification and reduce performance. A new method was used here to mitigate anolyte acidification based on adding non-buffered saline catholyte effluent from a previous cycle to the anolyte at the beginning of the next cycle. This method was tested using a larger-scale MDC (267 mL) containing four anode brushes and a three cell pair membrane stack. With an anolyte salt concentration increased by an equivalent of 75 mM NaCl using the catholyte effluent, salinity was reduced by 26.0 ± 0.5% (35 g/L NaCl initial solution) in a 10 h cycle, compared to 18.1 ± 2.0% without catholyte addition. This improvement was primarily due to the increase in buffering capacity of the anolyte, although increased conductivity slightly improved performance as well. There was some substrate loss from the anolyte by diffusion into the membrane stack, but this was decreased from 11% to 2.6% by increasing the anolyte conductivity (7.6 to 14 mS/cm). These results demonstrated that catholyte effluent can be utilized as a useful product for mitigating anolyte acidification and improving MDC performance. © 2013 American Chemical Society.en
dc.description.sponsorshipThe authors thank Siemens Corp. for kindly donating an electrodialysis reactor as a design reference for this project, Hiroyuki Kashima for his help with ion chromatography, and Dr. Xiuping Zhu for conducting the HPLC analysis. This research was supported by Award KUS-11-003-13 from the King Abdullah University of Science and Technology (KAUST).en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectAnolyte acidificationen
dc.subjectDesalinationen
dc.subjectElectrolyte recycleen
dc.subjectMDCen
dc.subjectMicrobial desalination cellen
dc.subjectMulti-anodeen
dc.titleIncreasing Desalination by Mitigating Anolyte pH Imbalance Using Catholyte Effluent Addition in a Multi-Anode Bench Scale Microbial Desalination Cellen
dc.typeArticleen
dc.identifier.journalACS Sustainable Chemistry & Engineeringen
dc.contributor.institutionPennsylvania State University, State College, United Statesen
dc.contributor.institutionMcMaster University, Hamilton, Canadaen
kaust.grant.numberKUS-11-003-13en
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