Author: Hannon, F.E.
Paper Title Page
An E-Beam Irradiation Beamline at Jefferson Lab for 1,4-Dioxane and Per- and Polyfluoroalkyl Substances Remediation in Wastewater  
  • X. Li, H. Baumgart
    ODU, Norfolk, Virginia, USA
  • G. Ciovati, M.D. McCaughan, M. Poelker, S. Wang
    JLab, Newport News, Virginia, USA
  • F.E. Hannon
    Phase Space Tech, Bjärred, Sweden
  Funding: Jefferson Lab Laboratory Directed Research and Development Program.
The Upgraded Injector Test Facility (UITF) at Jefferson Lab, providing a beam energy up to 10 MeV, is suitable for wastewater remediation research. To investigate the degradation of 1,4-dioxane and per- and polyfluoroalkyl substances (PFAS), widespread in wastewater and potential to be regulated in near future [1], a beamline for electron-beam irradiation has been designed, installed and successfully commissioned at the UITF. A solenoid with a peak axial magnetic field of up to 0.28 T and a raster were used to obtain a Gaussian beam profile with a transverse standard deviation of ~15 mm. It was applied to irradiate 1,4-dioxane sample filled in the target cell that was designed to let the entire sample receive significant irradiation doses. The dose distribution and absorbed dose, few studied in the existing publications, are necessary measures for the degradation mechanism investigation and have been innovatively achieved in this work using simulations, which were calibrated with opti-chromic dosimeter rods directly exposed to the electron beam. This approach provides an important way for investigating the environmental remediation impact of electron-beam irradiation.
[1] U.S. EPA. Announcement of preliminary regulatory determinations for
contaminants on the fourth drinking water contaminant candidate list. Federal register, 85(47):14098 - 14142, 2020.2.
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