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dc.contributor.authorBaek, Gahyun
dc.contributor.authorSaikaly, Pascal
dc.contributor.authorLogan, Bruce
dc.date.accessioned2020-10-28T11:41:31Z
dc.date.available2020-10-28T11:41:31Z
dc.date.issued2020-10-26
dc.date.submitted2020-09-03
dc.identifier.citationBaek, G., Saikaly, P. E., & Logan, B. E. (2020). Addition of a carbon fiber brush improves anaerobic digestion compared to external voltage application. Water Research, 116575. doi:10.1016/j.watres.2020.116575
dc.identifier.issn0043-1354
dc.identifier.doi10.1016/j.watres.2020.116575
dc.identifier.urihttp://hdl.handle.net/10754/665681
dc.description.abstractTwo methods were examined to improve methane production efficiency in anaerobic digestion (AD) based on adding a large amount of surface area using a single electrically conductive carbon brush, or by adding electrodes as done in microbial electrolysis cells (MECs) to form a hybrid AD-MEC. To examine the impact of surface area relative to electrodes, AD reactors were fitted with a single large brush without electrodes (FB), half a large brush with two electrodes with an applied voltage (0.8 V) and operated in closed circuit (HB-CC) or open circuit (HB-OC) mode, or only two electrodes with a closed circuit and no large brush (NB-CC) (equivalent to an MEC). The three configurations with a half or full brush all had improved performance as shown by 57-82% higher methane generation rate parameters in the Gompertz model compared to NB-CC. The retained biomass was much higher in the reactors with large brush, which likely contributed to the rapid consumption of volatile fatty acids (VFAs) and therefore improved AD performance. A different microbial community structure was formed in the large-size brushes compared to the electrodes. Methanothrix was predominant in the biofilm of large-size carbon brush, while Geobacter (anode) and Methanobacterium (cathode) were highly abundant in the electrode biofilms. These results demonstrate that adding a high surface area carbon fiber brush will be a more effective method of improving AD performance than using MEC electrodes with an applied potential.
dc.description.sponsorshipThis research was funded by the Stan and Flora Kappe endowment and other funds through The Pennsylvania State University.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0043135420311106
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Water Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Water Research, [, , (2020-10-26)] DOI: 10.1016/j.watres.2020.116575 . © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleAddition of a carbon fiber brush improves anaerobic digestion compared to external voltage application
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentEnvironmental Biotechnology Research Group
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.identifier.journalWater Research
dc.rights.embargodate2022-10-26
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Civil and Environmental Engineering, The Pennsylvania State University, 231Q Sackett Building, University Park, PA 16802, USA.
dc.identifier.pages116575
kaust.personSaikaly, Pascal
dc.date.accepted2020-10-26
refterms.dateFOA2020-10-28T11:42:29Z
dc.date.published-online2020-10-26
dc.date.published-print2021-01


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