Multi-electrode continuous flow microbial electrolysis cell for biogas production from acetate

Handle URI:
http://hdl.handle.net/10754/598898
Title:
Multi-electrode continuous flow microbial electrolysis cell for biogas production from acetate
Authors:
Rader, Geoffrey K.; Logan, Bruce E.
Abstract:
Most microbial electrolysis cells (MECs) contain only a single set of electrodes. In order to examine the scalability of a multiple-electrode design, we constructed a 2.5 L MEC containing 8 separate electrode pairs made of graphite fiber brush anodes pre-acclimated for current generation using acetate, and 304 stainless steel mesh cathodes (64 m2/m3). Under continuous flow conditions and a one day hydraulic retention time, the maximum current was 181 mA (1.18 A/m2, cathode surface area; 74 A/m 3) within three days of operation. The maximum hydrogen production (day 3) was 0.53 L/L-d, reaching an energy efficiency relative to electrical energy input of ηE = 144%. Current production remained relatively steady (days 3-18), but the gas composition dramatically shifted over time. By day 16, there was little H2 gas recovered and methane production increased from 0.049 L/L-d (day 3) to 0.118 L/L-d. When considering the energy value of both hydrogen and methane, efficiency relative to electrical input remained above 100% until near the end of the experiment (day 17) when only methane gas was being produced. Our results show that MECs can be scaled up primarily based on cathode surface area, but that hydrogen can be completely consumed in a continuous flow system unless methanogens can be completely eliminated from the system. © 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
Citation:
Rader GK, Logan BE (2010) Multi-electrode continuous flow microbial electrolysis cell for biogas production from acetate. International Journal of Hydrogen Energy 35: 8848–8854. Available: http://dx.doi.org/10.1016/j.ijhydene.2010.06.033.
Publisher:
Elsevier BV
Journal:
International Journal of Hydrogen Energy
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
Sep-2010
DOI:
10.1016/j.ijhydene.2010.06.033
Type:
Article
ISSN:
0360-3199
Sponsors:
This study was supported by the National Renewable Energy Laboratory (NREL) and the King Abdullah University of Science and Technology (KAUST) (Award KUS-I1-003-13).
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorRader, Geoffrey K.en
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2016-02-25T13:43:19Zen
dc.date.available2016-02-25T13:43:19Zen
dc.date.issued2010-09en
dc.identifier.citationRader GK, Logan BE (2010) Multi-electrode continuous flow microbial electrolysis cell for biogas production from acetate. International Journal of Hydrogen Energy 35: 8848–8854. Available: http://dx.doi.org/10.1016/j.ijhydene.2010.06.033.en
dc.identifier.issn0360-3199en
dc.identifier.doi10.1016/j.ijhydene.2010.06.033en
dc.identifier.urihttp://hdl.handle.net/10754/598898en
dc.description.abstractMost microbial electrolysis cells (MECs) contain only a single set of electrodes. In order to examine the scalability of a multiple-electrode design, we constructed a 2.5 L MEC containing 8 separate electrode pairs made of graphite fiber brush anodes pre-acclimated for current generation using acetate, and 304 stainless steel mesh cathodes (64 m2/m3). Under continuous flow conditions and a one day hydraulic retention time, the maximum current was 181 mA (1.18 A/m2, cathode surface area; 74 A/m 3) within three days of operation. The maximum hydrogen production (day 3) was 0.53 L/L-d, reaching an energy efficiency relative to electrical energy input of ηE = 144%. Current production remained relatively steady (days 3-18), but the gas composition dramatically shifted over time. By day 16, there was little H2 gas recovered and methane production increased from 0.049 L/L-d (day 3) to 0.118 L/L-d. When considering the energy value of both hydrogen and methane, efficiency relative to electrical input remained above 100% until near the end of the experiment (day 17) when only methane gas was being produced. Our results show that MECs can be scaled up primarily based on cathode surface area, but that hydrogen can be completely consumed in a continuous flow system unless methanogens can be completely eliminated from the system. © 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.en
dc.description.sponsorshipThis study was supported by the National Renewable Energy Laboratory (NREL) and the King Abdullah University of Science and Technology (KAUST) (Award KUS-I1-003-13).en
dc.publisherElsevier BVen
dc.subjectElectrohydrogenesisen
dc.subjectHydrogenen
dc.subjectMECen
dc.subjectMethanogenesisen
dc.subjectScale-upen
dc.titleMulti-electrode continuous flow microbial electrolysis cell for biogas production from acetateen
dc.typeArticleen
dc.identifier.journalInternational Journal of Hydrogen Energyen
dc.contributor.institutionPennsylvania State University, State College, United Statesen
kaust.grant.numberKUS-I1-003-13en
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.