A Field Test of Electromigration as a Method for Remediating Sulfate from Shallow Ground Water |
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| Authors: | Charles G Patterson Donald D Runnells |
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| Institution: | Charles Patterson (Department of Geological Sciences, University of Colorado, Boulder, CO 80309-0250) is a Ph.D. candidate in geochemistry at the University of Colorado, Boulder. He also heads up his own environmental consulting firm, Alpine Geosciences. Patterson has worked for the U.S. Geological Survey and currently teaches at Red Rocks Community College. He has served as a consultant in geochemistry and geology to many private firms and governmental agencies.;Donald D. Runnells is president and senior geochemist of Shepherd Miller Inc., Consulting Environmental &Geotechnical Engineers &Scientists, located in Fort Collins, Colorado (3801 Automation Way, Ste. 100, Fort Collins, CO 80525). He has 30 years experience in the research and management of scientific projects involving geochemical aspects of the fate and transport of contaminants, including heavy metals and radioactive elements. He is a professor emeritus at the University of Colorado, Boulder. |
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| Abstract: | Eloctromigraiion offers a potential tool for remediating ground water contaminated with highly soluble components, such as Na+, Cl, NO3 and SO4?. A field experiment was designed to lest the efficacy of electromigration for preconcontrating dissolved SO42 in ground water associated with a fossil-fuel power plant. Two shallow wells, 25 feel apart (one 25 feel deep, the other 47 feet deep), were constructed in the upper portion of an unconfined alluvial aquifer. The wells were constructed with a double-wall design, with an outer casing of 4-inch PVC and an inner lube of 2-inch FVC; both were fully slotted (0.01 inch). Electrodes were constructed by wrapping the inner lulling with a 100-foot length of rare-earth metal oxide/copper wire. An electrical potential of 10.65 volts DC Was applied, and tests were run for periods of 12, 44, and 216 hours. Results showed large changes in the pH from the initial pH of ground water of about 7.5 to values of approximately 2 and 12 at the anode and cathode, respectively. Despite the fact that the test conditions were far from ideal, dissolved SO42-; was significantly concentrated at the anode. Over a period of approximately nine days, the concentration of SO42- at the anode reached what appeared to he a steady-state value of 2200 mg/L. compared lo the initial value in ground water of approximately 1150 mg/L. The results of this field lest should encourage further investigation of electromigration as a tool in the remediation of contaminated ground water. |
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