TY - JOUR

T1 - Monitoring of microbially mediated corrosion and scaling processes using redox potential measurements

AU - Opel, Oliver

AU - Eggerichs, Tanja

AU - Otte, Tobias

AU - Ruck, Wolfgang

PY - 2014/6

Y1 - 2014/6

N2 - The use of redox potential measurements for corrosion and scaling monitoring, including microbially mediated processes, is demonstrated. As a case study, monitoring data from 10. years of operation of an aquifer thermal energy storage (ATES) site located in Berlin, Germany, were examined.(Fe 2+)-activities as well as [Fe 3+]-build up rates were calculated from redox potential, pH, conductivity, temperature and dissolved oxygen measurements. Calculations are based on assuming (Fe 3+)-activity being controlled by Fe(OH) 3-solubility, the primary iron(III)-precipitate. This approach was tested using a simple log-linear model including dissolved oxygen besides major Fe 2+-ligands. Measured redox potential values in groundwater used for thermal storage are met within ±8mV. In other systems comprising natural groundwater and in heating and cooling systems in buildings, quantitatively interpretable values are obtained also.It was possible to calculate particulate [Fe 3+]-loads in the storage fluids in the order of 2μM and correlate a decrease in filter lifetimes to [Fe 3+]-build up rates, although observations show clear signs of microbially mediated scaling processes involving iron and sulphur cycling.

AB - The use of redox potential measurements for corrosion and scaling monitoring, including microbially mediated processes, is demonstrated. As a case study, monitoring data from 10. years of operation of an aquifer thermal energy storage (ATES) site located in Berlin, Germany, were examined.(Fe 2+)-activities as well as [Fe 3+]-build up rates were calculated from redox potential, pH, conductivity, temperature and dissolved oxygen measurements. Calculations are based on assuming (Fe 3+)-activity being controlled by Fe(OH) 3-solubility, the primary iron(III)-precipitate. This approach was tested using a simple log-linear model including dissolved oxygen besides major Fe 2+-ligands. Measured redox potential values in groundwater used for thermal storage are met within ±8mV. In other systems comprising natural groundwater and in heating and cooling systems in buildings, quantitatively interpretable values are obtained also.It was possible to calculate particulate [Fe 3+]-loads in the storage fluids in the order of 2μM and correlate a decrease in filter lifetimes to [Fe 3+]-build up rates, although observations show clear signs of microbially mediated scaling processes involving iron and sulphur cycling.

KW - Chemistry

KW - Aquifer

KW - Corrosion

KW - Redox potential

KW - Scaling

KW - Thermal systems

KW - Energy research

UR - http://www.scopus.com/inward/record.url?scp=84895929194&partnerID=8YFLogxK

U2 - 10.1016/j.bioelechem.2013.11.004

DO - 10.1016/j.bioelechem.2013.11.004

M3 - Journal articles

C2 - 24411307

VL - 97

SP - 137

EP - 144

JO - Bioelectrochemistry

JF - Bioelectrochemistry

SN - 1567-5394

IS - Special Issue

ER -