President and Principal Engineer
EnChem Engineering, Inc.
Raymond Ball, Ph.D., P.E., L.S.P. is President and Principal Engineer at EnChem Engineering, Inc. in Newton, Massachusetts. He has 35 years of consulting experience in the environmental industry that includes management and design services for hazardous waste site remediation projects including U.S. EPA National Priority List sites, military bases, any many commercial and industrial release sites. In addition, he served as Principal Investigator and Co-Principal Investigator on four federally funded research and development projects related to improving in-situ treatment technology, and published 5 peer reviewed papers. He has commercialized two patented technologies marketed under the trade name of OxyZone®. His current focus is the design and implementation of OxyZone technologies for treatment of emerging contaminants. He obtained a Ph.D. in Environmental (Chemical) Engineering from Northeastern University, a M.S. in Environmental Engineering, from the University of Michigan, and B.S. in Civil & Environmental Engineering from the University of Cincinnati.
PLATFORM & POSTER PRESENTATION
Remediation of Perfluoroalkyl Substances Using OxyZone®, a Multi-Oxidant Blend
Field and laboratory results of PFC remediation with a blend of chemical oxidants commercially available as OxyZone® from EnChem Engineering, Inc. (EnChem) will be presented.
Soil and groundwater in the Fire Fighting Area at Joint Base Langley- Eustis Site in Virginia is contaminated with aromatic and chlorinated VOCs, SVOCs and PFCs from releases of waste fuels and fire-fighting foams. Following in-situ OxyZone® treatment, EnChem observed statistically significant decreases in the concentration of PFCs in the groundwater, suggesting in-situ degradation had occurred rather than dilution of the groundwater. Monitoring of the conservative tracer chloride also indicated that dilution of the contaminants had not occurred.
Bench scale treatability studies were performed to investigate to what extent OxyZone® could degrade and destroy PFCs, specifically PFOS and PFOA. These experiments treated distilled water and Site groundwater that was spiked with PFOS and PFOA with OxyZone® for up to 1 day. The results showed that concentrations of PFOS and PFOA in spiked DI water decreased by more than 99% to a concentration of less than 0.2 ppb in less than 2 hours. In spiked Site groundwater, PFOS and PFOA destruction was slower and less complete, requiring 23 hours to destroy 79-97% of the PFCs to concentrations of 0.4 to 14 ppb (depending on the specific PFC). This is presumably due to other contaminants exerting an oxidant demand on the oxidant mixture. The analytical results also showed transformation and/or destruction of PFCs other than PFOA and PFOS also took place. In the distilled water experiments, up to 92% of the fluoride from the degraded PFCs were detected in the solution, indicating significant defluorination.
It is expected that this technology will be applicable for in-situ and/or ex-situ treatment of site soil and groundwater contaminated with PFCs.