Opportunity at U.S. Environmental Protection Agency (EPA)
Chemical Oxidation and Process Optimization
National Risk Management Research Laboratory, Groundwater, Watershed & Ecosystem Restoration Division
||Ada, OK 748201198
|Huling, Scott G.
Groundwater contaminants can be oxidized utilizing various chemical oxidants. Three of the most commonly used oxidants involve hydrogen peroxide, persulfate, and permanganate. The feasibility of using these chemical oxidants in subsurface remediation and above-ground water treatment systems is dependent on a variety of site-specific conditions, including but not limited to (1) locating the source(s) of contamination, (2) delivery of oxidant to the contaminated zones, (3) background oxidant demand and competing reactions, (4) reaction rate kinetics, (5) reaction byproducts, and (6) attenuation of reaction byproducts. As with any in-situ technology, mass transfer and mass transport limitations may significantly reduce process effectiveness and efficiency. Increasing information suggests that side and competing reactions play integral roles in oxidation treatment but are still not well understood. Overall, there is considerable interest in improving both the understanding of process fundamentals and the applied use of these oxidants in subsurface systems and in above ground water treatment systems involving chemical oxidation regeneration of granular activated carbon (GAC). Specifically, there is interest in the interaction of these chemical oxidants with chemical species associated with soil and aquifer materials, and with target and non-target contaminants during water treatment processes. Each of these chemical oxidants has specific costs, physical and chemical characteristics, and transport characteristics, which translate into specific advantages and disadvantages when applied under different conditions. The advantages of each oxidant may be realized under specific conditions for optimal cost effectiveness and oxidation efficiency. A mass balance approach can be used in detailed studies to investigate process fundamentals and to accurately assess contaminant transformation. Research investigations will involve laboratory and/or field studies.
Chemical oxidation; Water treatment; In situ; Fenton; Hydrogen peroxide; Permanganate; Persulfate; Groundwater contamination; DNAPL; Optimization; Feasibility; GAC regeneration;
Open to U.S. citizens and permanent residents
Open to Postdoctoral and Senior applicants