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Updated: May 10, 2026

Precise Electrochemical Sizing of Individual Electro-Inactive Particles

Precise Electrochemical Sizing of Individual Electro-Inactive Particles

Published on: August 4, 2023

Relating MEC population dynamics to anode performance from DGGE and electrical data.

Elsemiek Croese¹, Karel J Keesman, Aura H C A Widjaja-Greefkes

¹Laboratory of Microbiology, Wageningen University, Dreijenplein 10, 6703 HB Wageningen, The Netherlands.

Systematic and Applied Microbiology

|July 9, 2013

Summary

Microbial electrolysis cells (MECs) show promise for H2 production. Bacterial communities, particularly Clostridium sticklandii, are key to electrochemical activity and current generation in MEC anodes.

Keywords:

Archaea Bacteria Bioelectrochemical system (BES)DGGE Hydrogen Microbial electrolysis cell (MEC)QR factorization Redundancy analysis

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Last Updated: May 10, 2026

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Characterizing Electron Transport through Living Biofilms

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Published on: June 1, 2018

Waste Water Derived Electroactive Microbial Biofilms: Growth, Maintenance, and Basic Characterization

Waste Water Derived Electroactive Microbial Biofilms: Growth, Maintenance, and Basic Characterization

Published on: December 29, 2013

Area of Science:

Microbial electrochemistry
Environmental microbiology

Background:

Microbial electrolysis cells (MECs) are promising for hydrogen (H2) production.
The specific microbial populations responsible for MEC electrochemical activity remain largely unknown.

Purpose of the Study:

To analyze the microbial community composition in MEC graphite felt anodes.
To correlate microbial community structure with MEC electrochemical performance.

Main Methods:

Denaturing gradient gel electrophoresis (DGGE) profiling of microbial communities.
Scanning electron microscopy (SEM) and fluorescence in situ hybridization (FISH) for microbial localization.
Redundancy analysis (RDA) and QR factorization-based estimation (QRE) to link community composition and performance.

Main Results:

Bacterial populations were diverse and differed significantly between anolyte and anode samples.
Archaeal populations were similar across samples and between MECs.
Bacteria were localized on fiber surfaces, suggesting their primary role in electrochemical activity.
Community composition strongly correlated with current density, with a Clostridium sticklandii strain identified as a key contributor.

Conclusions:

Bacterial community structure is significantly influenced by MEC operational modes, current density, and anode resistance.
Clostridium sticklandii appears to play a major role in acetate-driven current generation in MEC anodes.
Integrated RDA and QRE methods effectively reveal microbial populations involved in electrode interactions within MECs.