title: Sustainable in-well vapor stripping: A design, analytical model, and pilot study for groundwater remediation.
abstract: A sustainable in-well vapor stripping system is designed as a cost-effective alternative for remediation of shallow chlorinated solvent groundwater plumes. A solar-powered air compressor is used to inject air bubbles into a monitoring well to strip volatile organic compounds from a liquid to vapor phase while simultaneously inducing groundwater circulation around the well screen. An analytical model of the remediation process is developed to estimate contaminant mass flow and removal rates. The model was calibrated based on a one-day pilot study conducted in an existing monitoring well at a former dry cleaning site. According to the model, induced groundwater circulation at the study site increased the contaminant mass flow rate into the well by approximately two orders of magnitude relative to ambient conditions. Modeled estimates for 5h of pulsed air injection per day at the pilot study site indicated that the average effluent concentrations of dissolved tetrachloroethylene and trichloroethylene can be reduced by over 90% relative to the ambient concentrations. The results indicate that the system could be used cost-effectively as either a single- or multi-well point technology to substantially reduce the mass of dissolved chlorinated solvents in groundwater.
authors.affiliation: Department of Civil and Environmental Engineering, University of California, Davis, CA 95616, United States. Electronic address: patrick@baseline-env.com.
authors.forename: Patrick T
authors.initials: PT
authors.lastname: Sutton
authors.affiliation: Department of Civil and Environmental Engineering, University of California, Davis, CA 95616, United States.
authors.forename: Timothy R
authors.initials: TR
authors.lastname: Ginn
mesh_terms: D052918:Environmental Restoration and Remediation / Q000191:economics / Q000379:methods*; D060587:Groundwater / Q000032:analysis*; D006843:Hydrocarbons, Chlorinated / Q000737:chemistry*; D008962:Models, Theoretical; D010865:Pilot Projects; D012997:Solvents / Q000737:chemistry; D013750:Tetrachloroethylene / Q000737:chemistry; D014241:Trichloroethylene / Q000737:chemistry; D055549:Volatile Organic Compounds / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D006843:Hydrocarbons, Chlorinated; D012997:Solvents; D055549:Volatile Organic Compounds; D014874:Water Pollutants, Chemical; D014241:Trichloroethylene; D013750:Tetrachloroethylene
keywords: Back diffusion; Chlorinated solvent; Induced circulation; Reactive barrier; Sustainable remediation; Vapor stripping