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Principle Investigator: C. P. Huang Co-Investigator: Daniel Cha

Electrochemical Processes for In-situ Treatment of Contaminated Soils. Principle Investigator: C. P. Huang Co-Investigator: Daniel Cha Graduate Research Assistants: Jih-Hsing Chang Zhimin Qiang Menghau Sung Louis Cheng University of Delaware, Newark, DE 19716.

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Principle Investigator: C. P. Huang Co-Investigator: Daniel Cha

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  1. Electrochemical Processes for In-situ Treatment of Contaminated Soils Principle Investigator: C. P. Huang Co-Investigator: Daniel Cha Graduate Research Assistants: Jih-Hsing Chang Zhimin Qiang Menghau Sung Louis Cheng University of Delaware, Newark, DE 19716

  2. I. INTRODUCTION Typical contaminants in DOE soils include PCE, TCE, CHCl3, CCl4, PAHs and heavy metals such as Cu(II), Pb(II), As(V), Cr(VI), and Zn(II). Effective in-situ remediation technologies are urgently needed.

  3. II. OBJECTIVES To develop electrochemical processes for the in-situ treatment of contaminated soils. To study the mobilization of selected organics from soils by the electro-kinetic (EK) process. To study the oxidation of selected organics by the electro-Fenton process. To understand the mechanisms of the oxidation of selected organics by the electro-Fenton process.

  4. III. CONCEPTUAL DESIGN OF INTEGRATED ELECTROCHEMICAL PROCESS

  5. IVA.1. Physical-chemical Characteristics of Soil Samples

  6. IVA.2. Organic Compounds in Soil Samples

  7. IVA.3. Heavy Metal Fractionation in Soil Samples

  8. IVB.1. Adsorption of PCE • Experimental conditions: • p H = 7 • Ionic strength = 0.05 M (NaClO4) • Cs = 150 mg/L

  9. IVB.2. Adsorption of TCE • Experimental conditions: • p H = 7 • I = 0.05 M (NaClO4) • Cs = 1100 mg/L

  10. IVB.3. Adsorption of Naphthalene • Experimental conditions: • p H = 7 • I = 0.05 M (NaClO4) • Cs = 30 mg/L • Co-solvent to water (v) ratio= 1:4

  11. IVB.4. Adsorption of Naphthalene • Experimental conditions: • p H = 7 • I = 0.05 M (NaClO4) • Cs = 30 mg/L • Co-solvent to water (v) ratio= 3:2 • Soil to solution ratio (w) = varying

  12. IVB.5. Adsorption of Chlorophenols (Adsorption Isotherms) • Experimental conditions: • p H = 4 • I = 0.05 M (NaNO3) • C0 = varying

  13. IVB.6. Adsorption of Chlorophenols (Effect of pH) • Experimental conditions: • p H = varying • I = 0.05 M (NaNO3)

  14. IVC.1. Electrochemical Generation of Hydrogen Peroxide (Setup)

  15. IVC.2. Electrochemical Generation of Hydrogen Peroxide (current intensity) • Experimental conditions: • p H = 2 • I = 0.05 M (NaClO4) • O2 = 2000 cc/min (pipe diffuser) • T = 25 oC • Cathode Area =754 cm2

  16. IVC.3. Electrochemical Generation of Hydrogen Peroxide (pH) • Experimental conditions: • p H = varying • I = 0.05 M (NaClO4) • O2 = 2000 cc/min (100%, pipe diffuser) • T = 25 oC • Cathode Area =754 cm2 • Current Intensity = 1 Amp

  17. IVC.4. Electrochemical Generation of Hydrogen Peroxide (oxygen) • Experimental conditions: • p H = 3 • I = 0.05 M (NaClO4) • O2 = 2000 cc/min (stone diffuser) • T = 25 oC • Cathode Area = 754 cm2 • Current Intensity = 1 Amp

  18. IVC.5. Electrochemical Generation of Hydrogen Peroxide (temperature) • Experimental conditions: • p H = 3 • I = 0.05 M (NaClO4) • O2 = 2000 cc/min (100%, pipe diffuser) • T = varying • Cathode Area = 754 cm2 • Current Intensity = 1 Amp

  19. IVC.6. Electrochemical Generation of Hydrogen Peroxide (cathode surface area) • Experimental conditions: • p H = 3 • I = 0.05 M (NaClO4) • O2 = 2000 cc/min (100%, pipe diffuser) • T = 25 oC • Cathode Area = varying • Current Intensity = 1 Amp

  20. IVC.7. Electrochemical Generation of Hydrogen Peroxide Peroxide (current efficiency- H2O2 yield) • Experimental conditions: • p H = 3 • I = 0.05 M (NaClO4) • O2 = 2000 cc/min (100%, stone diffuser) • T = 25 oC • Cathode Area = 754 cm2 • Current Intensity = 1 Amp

  21. IVD.1. Electrokinetics (setup)

  22. IVD.2. Electrokinetics (mono-chlorophenols) • Experimental conditions: • p H = not controlled • Electrolyte = 10-3 M (NaCl) • Applied voltage = 12 v • T = 25 oC • Time = 15 days • Electrode distance = 10 cm

  23. IVD.3. Electrokinetics (di-Chlorophenol) • Experimental conditions: • p H = 6 • Electrolyte = 10-3 M (NaCl) • Applied voltage = 12 v • T = 25 oC • Time = varying • Electrode distance = 10 cm

  24. IVE.1. Fenton Oxidation (setup)

  25. IVE.2. Fenton Oxidation (PCE, batch mode) • Experimental conditions: • p H = 3 • I = 5 x10-2M (NaClO4) • H2O2 = 2 x10-3 M • T = 25 oC • FeSO4 = varying • C0 = 50 ppm

  26. IVE.3. Fenton Oxidation (TCE, batch mode) • Experimental conditions: • p H = 3 • I = 5 x10-2M (NaClO4) • H2O2 = varying • T = 25 oC • FeSO4 = 3x10-3 M • C0 = 100 ppm

  27. IVE.4. Fenton Oxidation (naphthalene, batch mode) • Experimental conditions: • p H = 3 • I = 5 x10-2M (NaClO4) • H2O2 = varying • T = 25 oC • FeSO4 = 1x10-3 M • C0 = 25ppm

  28. IVE.5. Fenton Oxidation (continuous mode) • Experimental conditions: • p H = 3 • I = 5 x10-2M (NaClO4) • H2O2 = 3.4 x10-4 M/min • T = 25 oC • FeSO4 = 1x 10-3 M (naphthalene), 1.5 x10-3 M (PCE), 3x10-3 M(TCE) • C0 = naphthalene:25 ppm; PCE = 50 ppm; TCE = 100ppm.

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