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In–situ Spatiotemporal Chemical Reactions at Water-Solid Interfacial Processes using Microelectrode Techniques: from Biofilm to Metal Corrosion
Citation:
Lee, W., X. Ma, J. Church, D. Wahman, AND J. Pressman. In–situ Spatiotemporal Chemical Reactions at Water-Solid Interfacial Processes using Microelectrode Techniques: from Biofilm to Metal Corrosion. Presented at 2015 AEESP, New Haven, CT, June 13 - 16, 2015.
Impact/Purpose:
Ultimately, this research will lead to better biofilm and corrosion control strategies for drinking water utilities.
Description:
Recent developments in microscale sensors allows the non-destructive and in–situ measurement of both the absolute and changes in chemical concentrations in engineered and natural aquatic systems. Microelectrodes represent a unique tool for studying in–situ chemical reactions in biofilm and at reactive surfaces, including metals. Using microelectrodes, microbial kinetic parameters and abiotic reaction rates can be determined to quantify constituent transport and reactions at water–solid interfaces. The objective of this research was to evaluate and quantify the micro-spatiotemporal chemical reactions within biofilm and at metal surfaces under simulated drinking water distribution system conditions by applying microelectrode techniques, microscopic observation, and associated kinetic modeling. The research outcomes have provided a better understanding of biofilm disinfection kinetics, including disinfectant penetration and biofilm activity, viability, and recovery. Microelectrodes were also successfully applied to conduct a comparative quantification of the micro-spatiotemporal reactions of chlorine and monochloramine at the surfaces of brass, copper, ductile iron, and cement coupons, providing a greater understanding on the micro-scale corrosion process and reaction rates at reactive pipe materials. Ultimately, this research will lead to better biofilm and corrosion control strategies for drinking water utilities.
