Document Type

Journal Article

Department/Unit

Department of Biology

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 ± 4.2 Ω) and optimal conductivity (12.8 ± 0.2 mS cm−1). Therefore, dilution with FWS could enhance energy recovery from SWS.

Publication Year

2016

Journal Title

Bioresource Technology

Volume number

200

Publisher

Elsevier

First Page (page number)

845

Last Page (page number)

852

Referreed

1

DOI

10.1016/j.biortech.2015.10.101

ISSN (print)

09608524

Keywords

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

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