MFC-cascade stacks maximise COD reduction and avoid voltage reversal under adverse conditions

Ledezma, Pablo, Greenman, John and Ieropoulos, Ioannis (2013) MFC-cascade stacks maximise COD reduction and avoid voltage reversal under adverse conditions. Bioresource Technology, 134 158-165. doi:10.1016/j.biortech.2013.01.119

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Author Ledezma, Pablo
Greenman, John
Ieropoulos, Ioannis
Title MFC-cascade stacks maximise COD reduction and avoid voltage reversal under adverse conditions
Journal name Bioresource Technology   Check publisher's open access policy
ISSN 0960-8524
1873-2976
Publication date 2013-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.biortech.2013.01.119
Open Access Status File (Author Post-print)
Volume 134
Start page 158
End page 165
Total pages 8
Place of publication Amsterdam, The Netherlands
Publisher Elsevier BV
Collection year 2014
Language eng
Abstract Six continuous-flow Microbial Fuel Cells (MFCs) configured as a vertical cascade and tested under different electrical connections are presented. When in parallel, stable operation and higher power and current densities than individual MFCs were observed, despite substrate imbalances. The cascading dynamic allowed for a cumulative COD reduction of >95% in approximately 5.7h, equivalent to 7.97kgCODm-3d-1. Under a series configuration, the stack exhibited considerable losses until correct fluidic/electrical insulation of the units was applied, upon which the stack also exhibited superior performance. In both electrical configurations, the 6MFC system was systematically starved for up to 15d, with no significant performance degradation. The results from the 14-month trials, demonstrate that cascade-stacking of small units can result in enhanced electricity production (vs single large units) and treatment rates without using expensive catalysts. It is also demonstrated that substrate imbalances and starvation do not necessarily result in cell-voltage reversal.
Keyword Microbial fuel cells
Stacking
Voltage reversal
Wastewater treatment
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Advanced Water Management Centre Publications
 
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Created: Wed, 07 Jan 2015, 02:39:28 EST by Pablo Ledezma on behalf of Advanced Water Management Centre