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

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... Full description

Journal Title: Water Research 01 May 2012, Vol.46(7), pp.2215-2224
Main Author: Yan, Hengjing
Other Authors: Saito, Tomonori , Regan, John M
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0043-1354 ; E-ISSN: 1879-2448 ; DOI: 10.1016/j.watres.2012.01.050
Link: https://www.sciencedirect.com/science/article/pii/S0043135412000826
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recordid: elsevier_sdoi_10_1016_j_watres_2012_01_050
title: Nitrogen removal in a single-chamber microbial fuel cell with nitrifying biofilm enriched at the air cathode
format: Article
creator:
  • Yan, Hengjing
  • Saito, Tomonori
  • Regan, John M
subjects:
  • Air Cathode
  • Nitrification
  • Denitrification
  • Cathode Biofilm
  • Engineering
ispartof: Water Research, 01 May 2012, Vol.46(7), pp.2215-2224
description: 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 , compared to 90.7% and 945 ± 42 mW/m 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 ). 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. ► Single-chamber MFCs achieved nitrification and denitrification without aeration. ► Nitrifying biofilms were pre-enriched on the cathode of MFCs. ► Pre-enrichment helped MFCs to achieve greater ammonia removal rates. ► Pre-enrichment helped MFCs to achieve greater maximum power densities. ► Compared to Nafion, the DEA binder accelerated nitrifying biofilm enrichment.
language: eng
source:
identifier: ISSN: 0043-1354 ; E-ISSN: 1879-2448 ; DOI: 10.1016/j.watres.2012.01.050
fulltext: fulltext
issn:
  • 0043-1354
  • 00431354
  • 1879-2448
  • 18792448
url: Link


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titleNitrogen removal in a single-chamber microbial fuel cell with nitrifying biofilm enriched at the air cathode
creatorYan, Hengjing ; Saito, Tomonori ; Regan, John M
ispartofWater Research, 01 May 2012, Vol.46(7), pp.2215-2224
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subjectAir Cathode ; Nitrification ; Denitrification ; Cathode Biofilm ; Engineering
descriptionNitrogen 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 , compared to 90.7% and 945 ± 42 mW/m 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 ). 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. ► Single-chamber MFCs achieved nitrification and denitrification without aeration. ► Nitrifying biofilms were pre-enriched on the cathode of MFCs. ► Pre-enrichment helped MFCs to achieve greater ammonia removal rates. ► Pre-enrichment helped MFCs to achieve greater maximum power densities. ► Compared to Nafion, the DEA binder accelerated nitrifying biofilm enrichment.
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