Impact of flow recirculation and anode dimensions on performance of a large scale microbial fuel cell

Ruggero Rossi, Patrick J. Evans, Bruce Ernest Logan

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Many design and operational parameters that can impact power generation in microbial fuel cells (MFCs), such as flow over the electrodes, can only be effectively examined in larger-scale systems. A maximum power density of 0.101 ± 0.006 W m−2 (0.74 ± 0.05 W m−3) was obtained in an 85-L MFC with graphite fiber brushes (5.1 cm diameter, 61 cm long) and flat air cathode (0.62 m2 exposed area; anode-cathode spacing of 1.3 cm) in batch mode. Recirculating the anolyte diagonally through the chamber (entering the top right side of the reactor and exiting the bottom left side) further improved performance by 17% to 0.118 ± 0.006 W m−2, at a hydraulic retention time (HRT) of 22 min (3.9 L min−1), compared to static flow conditions. This power density was also higher than that obtained with parallel flow through the chamber (more evenly distributed using a manifold; 0.109 ± 0.009 W m−2). Reducing the diameter of the anode brushes from 5.1 cm to 2.5 cm did not improve the anode performance. These results demonstrate the importance of electrode spacing and hydraulic flow on large-scale MFC performance.

Original languageEnglish (US)
Pages (from-to)294-300
Number of pages7
JournalJournal of Power Sources
DOIs
StatePublished - Feb 1 2019

Fingerprint

Microbial fuel cells
fuel cells
Anodes
anodes
brushes
Brushes
hydraulics
radiant flux density
Cathodes
chambers
cathodes
spacing
Hydraulics
Graphite fibers
parallel flow
Parallel flow
Electrodes
electrodes
Power generation
Large scale systems

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

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title = "Impact of flow recirculation and anode dimensions on performance of a large scale microbial fuel cell",
abstract = "Many design and operational parameters that can impact power generation in microbial fuel cells (MFCs), such as flow over the electrodes, can only be effectively examined in larger-scale systems. A maximum power density of 0.101 ± 0.006 W m−2 (0.74 ± 0.05 W m−3) was obtained in an 85-L MFC with graphite fiber brushes (5.1 cm diameter, 61 cm long) and flat air cathode (0.62 m2 exposed area; anode-cathode spacing of 1.3 cm) in batch mode. Recirculating the anolyte diagonally through the chamber (entering the top right side of the reactor and exiting the bottom left side) further improved performance by 17{\%} to 0.118 ± 0.006 W m−2, at a hydraulic retention time (HRT) of 22 min (3.9 L min−1), compared to static flow conditions. This power density was also higher than that obtained with parallel flow through the chamber (more evenly distributed using a manifold; 0.109 ± 0.009 W m−2). Reducing the diameter of the anode brushes from 5.1 cm to 2.5 cm did not improve the anode performance. These results demonstrate the importance of electrode spacing and hydraulic flow on large-scale MFC performance.",
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Impact of flow recirculation and anode dimensions on performance of a large scale microbial fuel cell. / Rossi, Ruggero; Evans, Patrick J.; Logan, Bruce Ernest.

In: Journal of Power Sources, 01.02.2019, p. 294-300.

Research output: Contribution to journalArticle

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