Mathematical modeling of microbial extracellular electron transfer by electrically active microorganisms

Liu, Yiwen, Peng, Lai, Gao, Shu-Hong, Dai, Xiaohu and Ni, Bing-Jie (2015) Mathematical modeling of microbial extracellular electron transfer by electrically active microorganisms. Environmental Science: Water Research and Technology, 1 6: 747-752. doi:10.1039/c5ew00155b

Author Liu, Yiwen
Peng, Lai
Gao, Shu-Hong
Dai, Xiaohu
Ni, Bing-Jie
Title Mathematical modeling of microbial extracellular electron transfer by electrically active microorganisms
Journal name Environmental Science: Water Research and Technology   Check publisher's open access policy
ISSN 2053-1400
Publication date 2015-11-01
Sub-type Article (original research)
DOI 10.1039/c5ew00155b
Open Access Status Not Open Access
Volume 1
Issue 6
Start page 747
End page 752
Total pages 6
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Formatted abstract
Extracellular electron transfer by electrically active microorganisms enables the conduction of electrons over long spatial distances in marine sediment, which plays an important role in global biogeochemical cycles through the generated electric currents. In this study, a mathematical model is developed to describe the extracellular electron transfer process by electrically active microorganisms through decoupling the oxidation and reduction processes, taking sulfide-oxidizing bacteria as examples. In this model, extracellular electron carriers are introduced as new components to link the oxidation and reduction reactions and to achieve the long-range indirect electron transport using decoupled Monod kinetics, allowing for the description of distinct separation of contrasting electrochemical regions. The developed model has been successfully applied to reproduce experimental data for sulfide oxidation and electron acceptor reduction via extracellular electron transfer from two independent study reports with different experimental conditions (oxygen or nitrate as electron acceptors) and transfer mechanisms (possibly different extracellular electron carriers) through calibration of three key parameters (koxi, kred and Kmed) that govern the long-range indirect electron transport. The model satisfactorily describes the experimental data from both systems, suggesting the validity and applicability of the model. Modeling results clearly showed two distinct zones with sulfide consumption (sediment floor) and oxygen (or nitrate) reduction (top surface) enabled by electron conduction via electron carriers. The model of this work would enhance our understanding of biogeochemical interactions with natural electric currents allowing oxidation and reduction processes to be spatially separated yet instantly and intimately coupled, while also potentially being applicable to a wide range of electrically active microorganisms.
Keyword Marine sediment
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
Advanced Water Management Centre Publications
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