Emerging Contaminants Summit

March 6-7, 2018

Westminster, CO
The Westin Westminster

StudentCompetitionJeramy Jasmann
Graduate Research Assistant
Colorado State University

Jeramy Jasmann holds a B.S. in Biochemisty from the University of California Davis and is currently completing his PhD in Environmental Analytical Chemistry from Colorado State University in Fort Collins. Jeramy lives in Fort Collins with his beautiful wife Christine and three young children. His love of outdoor sports like whitewater kayaking and mountain biking created a natural passion for environmental stewardship. This interest in environmental awareness and protection, especially regarding water resources, continued to mature during in his first career teaching high school students chemistry and environmental science for a decade. His dissertation research on catalyzed electrochemical and biodegradation of the emerging aqueous contaminant 1,4-dioxane has provided him a solid foundation in fate and transport of chemical contaminants in surface and groundwater, while also developing his expertise in many analytical methods for micropollutants and microbes (e.g. GC-MS, LC-H RMS, ICP-OES, qPCR). He successfully developed bench-scale continuous-flow electrolytic reactors that highlighted the efficacy of this treatment technology for 1,4-dioxane, resulting in a pilot study currently investigating its remediation ability in the field. Jeramy is finishing his PhD program this spring (2016) and is actively seeking a career where his expertise can be used to better understand environmental contamination problems and work on productive solutions.

 

POSTER PRESENTATION

Novel Electrochemical Oxidation Treatments for 1,4-Dioxane Employing Synergistic Benefits from Inter-electrode Catalyst and Microbial Stimulation

1,4-Dioxane is an emerging contaminant found in groundwater as a result of widespread use, primarily as a stabilizer in chlorinated solvents. Currently applied technologies that effectively degrade 1,4-dioxane, often ex situ UV-based advanced oxidation processes (AOPs), are chemically intensive and expensive. There is high need for more cost-effective remediation since the cost barrier can limit full scale treatment at many sites. Electrochemical oxidation is an emerging AOP that can completely mineralize aqueous organic pollutants with reactive oxygen species (ROS). Our overarching goal was to develop an effective and economical treatment technology for 1,4-dioxane that allows for ex situ and in situ treatment of contaminated groundwater, e.g., through a permeable electrolytic barrier. We investigated the efficiency of electro-oxidation of 1,4-dioxane in continuous-flow columns while determining the impacts of important performance-controlling parameters. For the first time, we developed an inter-electrode titanium dioxide-based catalyst that enhanced oxidation kinetics most notably in low-electrolyte waters, where standard electrochemical approaches typically fail. TheTiO2, activated without needing (UV) light, provided active surface sites promoting 1,4-dioxane-ROS interactions. A second catalytic enhancement was developed, in which permeable electrodes produced O2 from the electrolysis of water to biostimulate aerobic degradation of 1,4-dioxane by Pseudonocardia dioxanivorans CB1190, a microaerophilic bacterium. Results indicated a 3-fold in crease in 1,4-dioxane degradation rates within the CB1190-innoculated reactor electro-stimulated upstream with 3.0V compared to an equivalent CB1190-innoculated reactor with no voltage applied. Our investigations illustrate that electrolytic treatment in combination with catalytically active TiO2 pellets or dioxane-metabolizing bacteria can be promising new technologies for 1,4-dioxane remediation.