Kristen Thoreson, Ph.D.
Director Research & Development
Dr. Thoreson leads the chemical research and product development program at REGENESIS. She is trained as a chemist, and her graduate and post-doctorate research focused on mechanistic investigations of chlorinated ethene degradation pathways using molecular models and compound specific isotope analysis (CSIA) for both biotic and abiotic systems. She obtained her BSc in chemistry from the University of Wisconsin – La Crosse, and her PhD in inorganic chemistry from the University of Minnesota. She also spent time as a postdoctoral associate at the Helmholtz Zentrum in Munich, Germany as a part of the Research Unit for Environmental Organic Isotope Chemistry.
Using Fate and Transport Models for Predicting Barrier Performance of a Liquid Activated Carbon
Author: J. Birnstingl, Carlos Ortez, Jay Snyder, Kristen Thoreson, Paul Erickson
The use and consideration of injecting a liquid activated carbon into an aquifer to create a long-term barrier is growing. The proper design and implementation of a LAC or other carbon barrier could only be properly accomplished by understanding the underlying competitive-sorption and transport processes of each organic contaminant involved. Successful understanding of competitive sorption/desorption phenomena allows appropriate dosing and life-cycle design as wells as when performance at monitoring wells should be expected. This talk will present examples of the use of modeling to predict, calibrate, and manage retardation based and passive plume management strategies using LAC. A complete understanding requires consideration of competing sorption of organics, including predicting impact from inter-barrier transformation of parent to daughter products. This approach can allow for a high degree of predictability which is helpful not only for site owners and regulators to predict results, but also to tune monitoring programs for cost saving.
Critical aspects of the approach will be discussed as well as comparison of modeled results to actual results at a large distal plume where a LAC was injected.