Worcester Polytechnic Institute Electronic Theses and Dissertations Collection

Title page for ETD etd-082511-103420


Document Typethesis
Author NameUlsamer, Signe Martha
Email Address signer at centurylink.net
URNetd-082511-103420
TitleA Model to Characterize the Kinetics of Dechlorination of Tetrachloroethylene and trichloroethylene By a Zero Valent Iron Permeable Reactive Barrier
DegreeMS
DepartmentCivil & Environmental Engineering
Advisors
  • John Bergendahl, Advisor
  • Paul Mathisen, Advisor
  • Keywords
  • VC
  • DCE
  • PCE
  • TCE
  • Permeable reactive barrier
  • Date of Presentation/Defense2011-08-22
    Availability unrestricted

    Abstract

    A one dimensional, multiple reaction pathway model of the dechlorination reactions of trichloroethylene (TCE) and tetrachloroethylene (PCE) as these species pass through a zero valent iron permeable reactive barrier (PRB) was produced. Three different types of rate equations were tested; first order, surface controlled with interspecies competition, and surface controlled with inter and intra species competition. The first order rate equations predicted the most accurate results when compared to actual data from permeable reactive barriers. Sensitivity analysis shows that the most important variable in determining TCE concentration in the barrier is the first order rate constant for the degradation of TCE. The velocity of the water through the barrier is the second most important variable determining TCE concentration. For PCE the concentration in the barrier is most sensitive to the velocity of the water and to the first order degradation rate constant for the PCE to dichloroacetylene reaction. Overall, zero valent iron barriers are more effective for the treatment of TCE than PCE.

    Files
  • Ulsamer.pdf

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