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Evaluation and Enhancement of Electro-Kinetic Technology for Remediation of Chromium Copper Arsenic from Clayey Soil

Title: Evaluation and Enhancement of Electro-Kinetic Technology for Remediation of Chromium Copper Arsenic from Clayey Soil.
Name(s): Ahmad, Hafiz, author
Leszczynska, Danuta, professor directing dissertation
Tull, James F., outside committee member
Dzurik, Andrew, committee member
Chan-Hilton, Amy, committee member
Department of Civil and Environmental Engineering, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2004
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: A relatively new technique of electro-kinetic remediation is examined to evaluate and enhance removal of residual of the CCA (chromated copper arsenate) from clayey soil. A short duration (25-hours) treatment approach was initiated for this purpose. Laboratory 1-D column tests were performed on kaolin soil under the influence of DC electric field. Different chemicals (acid, alkali and oxidizing agents) and tap water were purged through electro-osmotic flow to enhance chromium, copper, arsenic remediation. Configuration of electrodes/reactor setup was also adjusted to improve the removal efficiency of the CCA chemicals by inducing buoyancy with electro-osmotic flow. Interesting results were obtained showing up to 78% of arsenic and 72% copper removal by purging sodium hypo-chlorite (NaOCl). Sodium hydroxide (NaOH) purging also indicated enhanced removal with 74% arsenic and 72% copper removal. It was difficult to remove chromium and maximum removal was only 3.75% when the soil was purged with tap water. The batch experiments show that with respect to individual contaminant remediation, the removal efficiency increases many times when contaminants in the soil are in mixed-form. Inclined reactor setup showed enhanced electro-osmotic flow due to the effect of buoyancy. A model combining main phenomena of contaminant movement: electro-migration, electro-osmosis, diffusion, and buoyancy was developed for a small Debye length. The model predicts the behavior of pH, which is an important parameter that governs the migration of contaminants. Calculation based on the model showed excellent agreement when compared with the pH profile of experimental data of tap water purging for copper remediation. Although additional modeling and experimentation is needed, the results of this thesis demonstrate that electro-kinetic remediation with suitable purging chemicals may offer enhanced removal of polluted soil.
Identifier: FSU_migr_etd-0018 (IID)
Submitted Note: A Dissertation submitted to the Department of Civil and Environmental Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Degree Awarded: Degree Awarded: Fall Semester, 2004.
Date of Defense: Date of Defense: November 10, 2004.
Keywords: Redox-Potential, Electro-migration, Ellectro-osmosis, Effluent
Bibliography Note: Includes bibliographical references.
Advisory committee: Danuta Leszczynska, Professor Directing Dissertation; James F. Tull, Outside Committee Member; Andrew Dzurik, Committee Member; Amy Chan-Hilton, Committee Member.
Subject(s): Civil engineering
Environmental engineering
Persistent Link to This Record:
Owner Institution: FSU

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Ahmad, H. (2004). Evaluation and Enhancement of Electro-Kinetic Technology for Remediation of Chromium Copper Arsenic from Clayey Soil. Retrieved from