Nitrogen removal in a single-chamber microbial fuel cell with nitrifying biofilm enriched at the air cathode

Handle URI:
http://hdl.handle.net/10754/598977
Title:
Nitrogen removal in a single-chamber microbial fuel cell with nitrifying biofilm enriched at the air cathode
Authors:
Yan, Hengjing; Saito, Tomonori; Regan, John M.
Abstract:
Nitrogen removal is needed in microbial fuel cells (MFCs) for the treatment of most waste streams. Current designs couple biological denitrification with side-stream or combined nitrification sustained by upstream or direct aeration, which negates some of the energy-saving benefits of MFC technology. To achieve simultaneous nitrification and denitrification, without extra energy input for aeration, the air cathode of a single-chamber MFC was pre-enriched with a nitrifying biofilm. Diethylamine-functionalized polymer (DEA) was used as the Pt catalyst binder on the cathode to improve the differential nitrifying biofilm establishment. With pre-enriched nitrifying biofilm, MFCs with the DEA binder had an ammonia removal efficiency of up to 96.8% and a maximum power density of 900 ± 25 mW/m 2, compared to 90.7% and 945 ± 42 mW/m 2 with a Nafion binder. A control with Nafion that lacked nitrifier pre-enrichment removed less ammonia and had lower power production (54.5% initially, 750 mW/m 2). The nitrifying biofilm MFCs had lower Coulombic efficiencies (up to 27%) than the control reactor (up to 36%). The maximum total nitrogen removal efficiency reached 93.9% for MFCs with the DEA binder. The DEA binder accelerated nitrifier biofilm enrichment on the cathode, and enhanced system stability. These results demonstrated that with proper cathode pre-enrichment it is possible to simultaneously remove organics and ammonia in a single-chamber MFC without supplemental aeration. © 2012 Elsevier Ltd.
Citation:
Yan H, Saito T, Regan JM (2012) Nitrogen removal in a single-chamber microbial fuel cell with nitrifying biofilm enriched at the air cathode. Water Research 46: 2215–2224. Available: http://dx.doi.org/10.1016/j.watres.2012.01.050.
Publisher:
Elsevier BV
Journal:
Water Research
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
May-2012
DOI:
10.1016/j.watres.2012.01.050
PubMed ID:
22386083
Type:
Article
ISSN:
0043-1354
Sponsors:
This research was supported by Award KUS-I1-003-13 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.authorYan, Hengjingen
dc.contributor.authorSaito, Tomonorien
dc.contributor.authorRegan, John M.en
dc.date.accessioned2016-02-25T13:50:28Zen
dc.date.available2016-02-25T13:50:28Zen
dc.date.issued2012-05en
dc.identifier.citationYan H, Saito T, Regan JM (2012) Nitrogen removal in a single-chamber microbial fuel cell with nitrifying biofilm enriched at the air cathode. Water Research 46: 2215–2224. Available: http://dx.doi.org/10.1016/j.watres.2012.01.050.en
dc.identifier.issn0043-1354en
dc.identifier.pmid22386083en
dc.identifier.doi10.1016/j.watres.2012.01.050en
dc.identifier.urihttp://hdl.handle.net/10754/598977en
dc.description.abstractNitrogen removal is needed in microbial fuel cells (MFCs) for the treatment of most waste streams. Current designs couple biological denitrification with side-stream or combined nitrification sustained by upstream or direct aeration, which negates some of the energy-saving benefits of MFC technology. To achieve simultaneous nitrification and denitrification, without extra energy input for aeration, the air cathode of a single-chamber MFC was pre-enriched with a nitrifying biofilm. Diethylamine-functionalized polymer (DEA) was used as the Pt catalyst binder on the cathode to improve the differential nitrifying biofilm establishment. With pre-enriched nitrifying biofilm, MFCs with the DEA binder had an ammonia removal efficiency of up to 96.8% and a maximum power density of 900 ± 25 mW/m 2, compared to 90.7% and 945 ± 42 mW/m 2 with a Nafion binder. A control with Nafion that lacked nitrifier pre-enrichment removed less ammonia and had lower power production (54.5% initially, 750 mW/m 2). The nitrifying biofilm MFCs had lower Coulombic efficiencies (up to 27%) than the control reactor (up to 36%). The maximum total nitrogen removal efficiency reached 93.9% for MFCs with the DEA binder. The DEA binder accelerated nitrifier biofilm enrichment on the cathode, and enhanced system stability. These results demonstrated that with proper cathode pre-enrichment it is possible to simultaneously remove organics and ammonia in a single-chamber MFC without supplemental aeration. © 2012 Elsevier Ltd.en
dc.description.sponsorshipThis research was supported by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST).en
dc.publisherElsevier BVen
dc.subjectAir cathodeen
dc.subjectCathode biofilmen
dc.subjectDenitrificationen
dc.subjectNitrificationen
dc.titleNitrogen removal in a single-chamber microbial fuel cell with nitrifying biofilm enriched at the air cathodeen
dc.typeArticleen
dc.identifier.journalWater Researchen
dc.contributor.institutionPennsylvania State University, State College, United Statesen
dc.contributor.institutionOak Ridge National Laboratory, Oak Ridge, United Statesen
kaust.grant.numberKUS-I1-003-13en
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