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Spring Celebration

Spring Celebration. Use of Oxidants to Improve Contaminant Remediation. David L. Sedlak, Ph.D. sedlak@ce.berkeley.edu http://www.ce.berkeley.edu/~sedlak/. Project Team. David Sedlak (CEE) Fiona Doyle (MSE) David Waite (Univ. of New South Wales) Christy Keenan Ahn Pham.

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Spring Celebration

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  1. Spring Celebration Use of Oxidants to Improve Contaminant Remediation David L. Sedlak, Ph.D. sedlak@ce.berkeley.edu http://www.ce.berkeley.edu/~sedlak/

  2. Project Team • David Sedlak (CEE) • Fiona Doyle (MSE) • David Waite (Univ. of New South Wales) • Christy Keenan • Ahn Pham

  3. Oxidative Treatment Technologies • Motivation • Recalcitrant polar contaminants (e.g., NDMA) • Hydrophobic contaminants (e.g., PCBs) • Passive treatment (e.g., As in groundwater)

  4. Oxidative Treatment Technologies • Motivation • Recalcitrant polar contaminants (e.g., NDMA) • Hydrophobic contaminants (e.g., PCBs) • Passive treatment (e.g., As in groundwater) • Limitations • Requires unstable reagents (e.g., H2O2) • Hydroxyl radical is unselective

  5. Fe Nanoparticles as Reductants • Currently used for contaminant reduction Zhang (2003)

  6. Fe Nanoparticles as Oxidants • Oxygen activation during Fe corrosion Fe0(s) Fe2+ Fe0(s) Fe2+ 2H+ H2O H2O2 O2 O22- Fe2+ Fe3+ + OH- . OH- OH . RHR oxid

  7. Oxidation of Molinate by Fe Nanoparticles N2 air Joo et al. (2004) O2

  8. Oxidation of As(III) by Fe • As(III) oxidation and As(V) adsorption Leupin & Hug (2005)

  9. Oxidation of As(III) by Fe • Selective As(III) oxidation Hug and Leupin (2003)

  10. Oxidative Remediation with Iron • Fe can convert O2 into a powerful oxidant • Potential for selective oxidation on surface • Potential applications • Passive treatment barriers • Soil and groundwater treatment • Drinking water treatment

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