Volume 41, Issue 4 pp. 687-695
Research Article

Microbial Electrochemical Sensors for Anaerobic Digestion Process Control – Performance of Electroactive Biofilms under Real Conditions

Jörg Kretzschmar

Jörg Kretzschmar

DBFZ Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Biochemical Conversion Department, Torgauer Strasse 116, 04347 Leipzig, Germany

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Paul Böhme

Paul Böhme

DBFZ Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Biochemical Conversion Department, Torgauer Strasse 116, 04347 Leipzig, Germany

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Jan Liebetrau

Jan Liebetrau

DBFZ Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Biochemical Conversion Department, Torgauer Strasse 116, 04347 Leipzig, Germany

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Michael Mertig

Michael Mertig

Kurt-Schwabe-Institut für Mess- und Sensortechnik e.V. Meinsberg (KSI), Kurt-Schwabe-Strasse 4, 04720 Waldheim, Germany

Technical University Dresden, Physical Chemistry, Measurement and Sensor Technology, Eisenstuckstrasse 5, 01069 Dresden, Germany

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Falk Harnisch

Corresponding Author

Falk Harnisch

Helmholtz-Centre for Environmental Research GmbH – UFZ, Department Environmental Microbiology, Permoserstrasse 15, 04318 Leipzig, Germany

Correspondence: Falk Harnisch ([email protected]), Helmholtz-Centre for Environmental Research GmbH – UFZ, Department Environmental Microbiology, Permoserstrasse 15, 04318 Leipzig, Germany.Search for more papers by this author
First published: 17 January 2018
Citations: 23

Abstract

The autonomous growth of Geobacter sp.-dominated biofilms on electrodes and their sensitivity on volatile fatty acids (VFAs) allows their application as biosensor. In this study, the implementation of a microbial electrochemical sensor in the anaerobic digestion (AD) process is reported. The amperometric sensor signal follows the acetate concentration profile in the AD process. Yet, the sensor's stability is impaired by the process conditions. Therefore, potential biofilm inhibitors are individually examined, i.e., high salt and NH4+ concentrations as well as fumarate as potential alternative electron acceptor. The results show no influence of high salinity on the signal, whereas ammonia at a concentration ≥ 5 g L−1 NH4+ acts as inhibitor, and fumarate is used as substrate for current generation.

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