Influence of ionic conductivity in bioelectricity production from saline domestic sewage sludge in microbial fuel cells

Rengasamy Karthikeyan; Ammaiyappan Selvam; Ka Yu Cheng; Jonathan W C WONG

doi:10.1016/j.biortech.2015.10.101

Influence of ionic conductivity in bioelectricity production from saline domestic sewage sludge in microbial fuel cells

Rengasamy Karthikeyan, Ammaiyappan Selvam, Ka Yu Cheng, Jonathan W C WONG^*

^*Corresponding author for this work

Department of Biology

Research output: Contribution to journal › Journal article › peer-review

67 Citations (Scopus)

Abstract

This study aimed at manipulating ionic conductivity (EC) to harvest the maximum electrical energy from seawater-based domestic wastewater sewage sludge (SWS), unique to only a few cities, through microbial fuel cell (MFC). SWS has never been investigated as a MFC substrate before, and thus the influence of high in-situ EC on the energy recovery was unknown. In this study, the EC of the SWS was reduced through mixing it with fresh water-based domestic wastewater sewage sludge (FWS) or diluted 50% using deionized water while FWS and SWS were individually served as reference treatments. SWS:FWS mix (1:1) exhibited a maximum Coulombic efficiency of 28.6±0.5% at a COD removal of 59±3% while the peak power density was 20-fold higher than FWS. The improved performance was due to the lower ohmic internal resistance (36.8±4.2Ω) and optimal conductivity (12.8±0.2mScm^-1). Therefore, dilution with FWS could enhance energy recovery from SWS.

Original language	English
Pages (from-to)	845-852
Number of pages	8
Journal	Bioresource Technology
Volume	200
DOIs	https://doi.org/10.1016/j.biortech.2015.10.101
Publication status	Published - 1 Jan 2016

User-Defined Keywords

Bioelectricity
Ionic conductivity
Microbial fuel cell
Power density
Saline sewage sludge

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10.1016/j.biortech.2015.10.101

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title = "Influence of ionic conductivity in bioelectricity production from saline domestic sewage sludge in microbial fuel cells",

abstract = "This study aimed at manipulating ionic conductivity (EC) to harvest the maximum electrical energy from seawater-based domestic wastewater sewage sludge (SWS), unique to only a few cities, through microbial fuel cell (MFC). SWS has never been investigated as a MFC substrate before, and thus the influence of high in-situ EC on the energy recovery was unknown. In this study, the EC of the SWS was reduced through mixing it with fresh water-based domestic wastewater sewage sludge (FWS) or diluted 50% using deionized water while FWS and SWS were individually served as reference treatments. SWS:FWS mix (1:1) exhibited a maximum Coulombic efficiency of 28.6±0.5% at a COD removal of 59±3% while the peak power density was 20-fold higher than FWS. The improved performance was due to the lower ohmic internal resistance (36.8±4.2Ω) and optimal conductivity (12.8±0.2mScm-1). Therefore, dilution with FWS could enhance energy recovery from SWS.",

keywords = "Bioelectricity, Ionic conductivity, Microbial fuel cell, Power density, Saline sewage sludge",

author = "Rengasamy Karthikeyan and Ammaiyappan Selvam and Cheng, {Ka Yu} and WONG, {Jonathan W C}",

note = "Funding Information: Authors thankfully acknowledge the financial support from the Environmental and conservation fund (Project No. ECF/75/2014), and Innovation and Technology Fund (Project No. ITS/297/11), Hong Kong SAR Government. ",

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AU - Karthikeyan, Rengasamy

AU - Selvam, Ammaiyappan

AU - Cheng, Ka Yu

AU - WONG, Jonathan W C

N1 - Funding Information: Authors thankfully acknowledge the financial support from the Environmental and conservation fund (Project No. ECF/75/2014), and Innovation and Technology Fund (Project No. ITS/297/11), Hong Kong SAR Government.

PY - 2016/1/1

Y1 - 2016/1/1

N2 - This study aimed at manipulating ionic conductivity (EC) to harvest the maximum electrical energy from seawater-based domestic wastewater sewage sludge (SWS), unique to only a few cities, through microbial fuel cell (MFC). SWS has never been investigated as a MFC substrate before, and thus the influence of high in-situ EC on the energy recovery was unknown. In this study, the EC of the SWS was reduced through mixing it with fresh water-based domestic wastewater sewage sludge (FWS) or diluted 50% using deionized water while FWS and SWS were individually served as reference treatments. SWS:FWS mix (1:1) exhibited a maximum Coulombic efficiency of 28.6±0.5% at a COD removal of 59±3% while the peak power density was 20-fold higher than FWS. The improved performance was due to the lower ohmic internal resistance (36.8±4.2Ω) and optimal conductivity (12.8±0.2mScm-1). Therefore, dilution with FWS could enhance energy recovery from SWS.

AB - This study aimed at manipulating ionic conductivity (EC) to harvest the maximum electrical energy from seawater-based domestic wastewater sewage sludge (SWS), unique to only a few cities, through microbial fuel cell (MFC). SWS has never been investigated as a MFC substrate before, and thus the influence of high in-situ EC on the energy recovery was unknown. In this study, the EC of the SWS was reduced through mixing it with fresh water-based domestic wastewater sewage sludge (FWS) or diluted 50% using deionized water while FWS and SWS were individually served as reference treatments. SWS:FWS mix (1:1) exhibited a maximum Coulombic efficiency of 28.6±0.5% at a COD removal of 59±3% while the peak power density was 20-fold higher than FWS. The improved performance was due to the lower ohmic internal resistance (36.8±4.2Ω) and optimal conductivity (12.8±0.2mScm-1). Therefore, dilution with FWS could enhance energy recovery from SWS.

KW - Bioelectricity

KW - Ionic conductivity

KW - Microbial fuel cell

KW - Power density

KW - Saline sewage sludge

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Influence of ionic conductivity in bioelectricity production from saline domestic sewage sludge in microbial fuel cells

Abstract

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