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REMEDIATION OF SOILS CONTAMINATED WITH TETRAETHYL LEAD BY ELECTRIC FIELDS.
| 题名： | REMEDIATION OF SOILS CONTAMINATED WITH TETRAETHYL LEAD BY ELECTRIC FIELDS. |
| 作者： | Alshawabkeh-AN; Ozsu-Acar-E; Gale-RJ; Suppal-SK |
| 关键词： | SOILS-; CONTAMINATION-; LEAD-METAL; SOIL-TREATMENT; ELECTRIC-FIELDS; CALCIUM-; PH-VALUE; ACETIC-ACID; MEMBRANES-; LABORATORY-TESTS; EXTRACTION-; ENERGY-REQUIREMENTS; COST-EFFECTIVENESS |
| 摘要： | Four tests were conducted to investigate potential uses of electric fields for remediation of high buffering capacity soils contaminated with high lead concentrations (11% by dry weight). The soil samples were collected from a site in Louisiana where tetraethyl lead was used extensively for increasing the octane rating of leaded gasoline. Calcium was present at relatively high concentrations (9% by dry weight). Initial soil pH was basic (about 8.5). Two enhancement procedures were used: acetic acid for neutralizing the cathode and membranes to prevent migration of hydroxyl ions from the cathode. Current densities applied were in the order of 5 A/sq m to 10 A/sq m. Tests were processed for up to 3,220 hours. Lead extraction rates were significantly affected by high calcium concentration. Energy expenditure was very high (up to 20,667 kWh/cu m in the unenhanced test). The study showed that the soil buffering capacity significantly affected energy requirements, cost-effectiveness, and success of the process. Efficient extraction of lead in soils will be controlled by the presence of high concentrations of soluble ions (such as calcium) in the soil. |
| 总页数： | Transportation Research Record. 1998. (1615) pp79-85 (8 Fig., 2 Tab., 21 Ref.) |
| 报告类型： | 科技报告 |
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