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Environmental Science: Water Research & Technology Vol - 1 Issue - 5

Environmental Science: Water Research & Technology Vol - 1 Issue - 4

Environmental Science: Water Research & Technology Vol - 1 Issue - 3

Environmental Science: Water Research & Technology Vol - 1 Issue - 2

Environmental Science: Water Research & Technology Vol - 1 Issue - 1

Mathematical modeling of microbial extracellular electron transfer by electrically active microorganisms

Content Provider	Royal Society of Chemistry (RSC)
Author	Dai, Xiaohu Ni, Bing-Jie Peng, Lai Liu, Yiwen Gao, Shu-Hong
Copyright Year	2015
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.
Starting Page	747
Ending Page	752
Page Count	6
File Format	HTM / HTML PDF
ISSN	20531400
Volume Number	1
Issue Number	6
Journal	Environmental Science: Water Research & Technology
DOI	10.1039/c5ew00155b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Monod Sediment Biogeochemical cycle Mathematical model Sulfate-reducing microorganisms Electrochemistry Sulfide Electron acceptor Oxygen Nitrate
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Water Science and Technology

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Mathematical modeling of microbial extracellular electron transfer by electrically active microorganisms

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