Monitoring of microbially mediated corrosion and scaling processes using redox potential measurements
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In: Bioelectrochemistry, Vol. 97, No. Special Issue, 06.2014, p. 137-144.
Research output: Journal contributions › Journal articles › Research › peer-review
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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 -