Dylan Eberle is a geologist with Geosyntec Consultants (Acton, MA) with expertise in innovative remediation technologies and emerging contaminants. Eberle holds a Ph.D. in Environmental and Earth Sciences from the University of Rhode Island and has lead authorship on publications on 1,4-dioxane and per- and polyfluoroalkyl substances (PFAS). Eberle’s consulting experience with 1,4-dioxane and PFAS has included leading site investigations, development and evaluation of conceptual site models, forensics, litigation support, and research into oxidative remediation technologies. His experience with innovative remediation technologies has focused on the optimization of in situ oxidative and reductive treatment technologies.
DPT Jet Injection for Remediation in Low-Permeability Source Zones: Full-Scale Treatment Demonstrated by 4 Years of High Resolution Performance Monitoring
Direct-Push Technology Jet Injection (DPT-JI) is a treatment strategy that can overcome the challenges of treating chlorinated solvents in low-permeability formations. In this study DPT-JI was used to inject 49 tonnes of zero valent iron (mZVI) into a clay till source zone in Nivå, Denmark (the Site) for treatment of trichloroethene (TCE) and other chlorinated volatile organic compounds (CVOCs). The target treatment area (TTA) is approximately 750 m2 and 6 to 12 meters below ground surface.
After four years, the estimated mass of TCE in TTA soils decreased by approximately 94% from 29.3 kg to 1.9 kg; total CVOC mass (as TCE) in soil decreased by 82% over the same period. Groundwater data indicate that CVOC mass discharge from the TTA decreased by 94% four years post-injection and 6.5 mg/L of ethane was detected in groundwater. These findings demonstrate complete in situ degradation of TCE throughout the TTA and show that DPT-JI remedies can achieve significant degradation of CVOCs in low-permeability soils that are largely inaccessible to conventional injection technologies.