Domestic wastewater treatment using multi-electrode continuous flow MFCs with a separator electrode assembly design

Handle URI:
http://hdl.handle.net/10754/598011
Title:
Domestic wastewater treatment using multi-electrode continuous flow MFCs with a separator electrode assembly design
Authors:
Ahn, Yongtae; Logan, Bruce E.
Abstract:
Treatment of domestic wastewater using microbial fuel cells (MFCs) will require reactors with multiple electrodes, but this presents unique challenges under continuous flow conditions due to large changes in the chemical oxygen demand (COD) concentration within the reactor. Domestic wastewater treatment was examined using a single-chamber MFC (130 mL) with multiple graphite fiber brush anodes wired together and a single air cathode (cathode specific area of 27 m2/m3). In fed-batch operation, where the COD concentration was spatially uniform in the reactor but changed over time, the maximum current density was 148 ± 8 mA/m2 (1,000 Ω), the maximum power density was 120 mW/m2, and the overall COD removal was >90 %. However, in continuous flow operation (8 h hydraulic retention time, HRT), there was a 57 % change in the COD concentration across the reactor (influent versus effluent) and the current density was only 20 ± 13 mA/m2. Two approaches were used to increase performance under continuous flow conditions. First, the anodes were separately wired to the cathode, which increased the current density to 55 ± 15 mA/m2. Second, two MFCs were hydraulically connected in series (each with half the original HRT) to avoid large changes in COD among the anodes in the same reactor. The second approach improved current density to 73 ± 13 mA/m2. These results show that current generation from wastewaters in MFCs with multiple anodes, under continuous flow conditions, can be improved using multiple reactors in series, as this minimizes changes in COD in each reactor. © 2012 Springer-Verlag Berlin Heidelberg.
Citation:
Ahn Y, Logan BE (2012) Domestic wastewater treatment using multi-electrode continuous flow MFCs with a separator electrode assembly design. Applied Microbiology and Biotechnology 97: 409–416. Available: http://dx.doi.org/10.1007/s00253-012-4455-8.
Publisher:
Springer Nature
Journal:
Applied Microbiology and Biotechnology
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
11-Oct-2012
DOI:
10.1007/s00253-012-4455-8
PubMed ID:
23053104
Type:
Article
ISSN:
0175-7598; 1432-0614
Sponsors:
The MFC was designed in concert by Penn State and researchers from the Siemens Corporation. The research reported here was supported by the Siemens Corporation and Award KUS-I1-003-13 from the King Abdullah University of Science and Technology.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorAhn, Yongtaeen
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2016-02-25T13:10:56Zen
dc.date.available2016-02-25T13:10:56Zen
dc.date.issued2012-10-11en
dc.identifier.citationAhn Y, Logan BE (2012) Domestic wastewater treatment using multi-electrode continuous flow MFCs with a separator electrode assembly design. Applied Microbiology and Biotechnology 97: 409–416. Available: http://dx.doi.org/10.1007/s00253-012-4455-8.en
dc.identifier.issn0175-7598en
dc.identifier.issn1432-0614en
dc.identifier.pmid23053104en
dc.identifier.doi10.1007/s00253-012-4455-8en
dc.identifier.urihttp://hdl.handle.net/10754/598011en
dc.description.abstractTreatment of domestic wastewater using microbial fuel cells (MFCs) will require reactors with multiple electrodes, but this presents unique challenges under continuous flow conditions due to large changes in the chemical oxygen demand (COD) concentration within the reactor. Domestic wastewater treatment was examined using a single-chamber MFC (130 mL) with multiple graphite fiber brush anodes wired together and a single air cathode (cathode specific area of 27 m2/m3). In fed-batch operation, where the COD concentration was spatially uniform in the reactor but changed over time, the maximum current density was 148 ± 8 mA/m2 (1,000 Ω), the maximum power density was 120 mW/m2, and the overall COD removal was >90 %. However, in continuous flow operation (8 h hydraulic retention time, HRT), there was a 57 % change in the COD concentration across the reactor (influent versus effluent) and the current density was only 20 ± 13 mA/m2. Two approaches were used to increase performance under continuous flow conditions. First, the anodes were separately wired to the cathode, which increased the current density to 55 ± 15 mA/m2. Second, two MFCs were hydraulically connected in series (each with half the original HRT) to avoid large changes in COD among the anodes in the same reactor. The second approach improved current density to 73 ± 13 mA/m2. These results show that current generation from wastewaters in MFCs with multiple anodes, under continuous flow conditions, can be improved using multiple reactors in series, as this minimizes changes in COD in each reactor. © 2012 Springer-Verlag Berlin Heidelberg.en
dc.description.sponsorshipThe MFC was designed in concert by Penn State and researchers from the Siemens Corporation. The research reported here was supported by the Siemens Corporation and Award KUS-I1-003-13 from the King Abdullah University of Science and Technology.en
dc.publisherSpringer Natureen
dc.subjectContinuous flowen
dc.subjectDomestic wastewateren
dc.subjectMicrobial fuel cellen
dc.subjectScaling upen
dc.subjectSeparator electrode assemblyen
dc.titleDomestic wastewater treatment using multi-electrode continuous flow MFCs with a separator electrode assembly designen
dc.typeArticleen
dc.identifier.journalApplied Microbiology and Biotechnologyen
dc.contributor.institutionPennsylvania State University, State College, United Statesen
kaust.grant.numberKUS-I1-003-13en
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