A mathematical model for electrochemically active filamentous sulfide-oxidising bacteria

Fischer, Keelan M., Batstone, Damien J., van Loosdrecht, Mark C. M. and Picioreanu, Cristian (2015) A mathematical model for electrochemically active filamentous sulfide-oxidising bacteria. Bioelectrochemistry, 102 10-20. doi:10.1016/j.bioelechem.2014.11.002

Author Fischer, Keelan M.
Batstone, Damien J.
van Loosdrecht, Mark C. M.
Picioreanu, Cristian
Title A mathematical model for electrochemically active filamentous sulfide-oxidising bacteria
Journal name Bioelectrochemistry   Check publisher's open access policy
ISSN 1878-562X
Publication date 2015-04
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.bioelechem.2014.11.002
Open Access Status
Volume 102
Start page 10
End page 20
Total pages 11
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2015
Language eng
Formatted abstract
Oxygen and sulfide in ocean sediments can be consumed biologically over long spatial distances by way of filamentous bacteria in electron-conducting sheaths. To analyse observations, a mathematical model of these filamentous sulfur-oxidising bacteria was developed, including electrical conduction between reactive zones. Mechanisms include Nernst–Planck diffusion and migration of ions coupled with Ohm's law for conduction along filaments, and metabolic activity throughout the filaments. Simulations predict outward biomass growth toward the boundaries of the sediment floor and top surface, resulting in two distinct zones with anode (sulfide consumption) and cathode (oxygen consumption) reactions enabled by electron conduction. Results show inward fluxes of 4.6 mmol O2/m2/d and 2.5 mmol S/m2/d, with consumption increasing with growth to final fluxes of 8.2 mmol O2/m2/d and 4.34 mmol S/m2/d. Qualitatively, the effect of varying cell conductivity and substrate affinity is evaluated. Controlling mechanisms are identified to shift from biomass limitation, to substrate limitation, and to conductivity limitations as the lengths of the filaments increase. While most observed data are reflected in the simulation results, a key discrepancy is the lower growth rates, which are largely fixed by thermodynamics, indicating that microbes may utilise secondary substrates or an alternative metabolism.
Keyword Sulfur-oxidising bacteria
Current conduction
Mathematical model
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online ahead of print 20 Nov 2014

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Advanced Water Management Centre Publications
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