Scott Dane, Apblett Allen, Materer Nicholas F
Department of Chemistry, 107 Physical Science, Oklahoma State University, Stillwater, OK 74078, USA.
J Environ Monit. 2011 Sep;13(9):2521-6. doi: 10.1039/c1em10360a. Epub 2011 Jul 18.
The enduring effects of injected materials used for the remediation of chlorinated solvents were examined. Approximately two years previous to this study, four different remediation methods were tested in an area located southeast of Oklahoma City, OK. These methods included bioremediation under both anaerobic and aerobic conditions and chemical remediation using Fenton's reagent or KMnO(4). A series of water quality tests performed in this investigation revealed that the bioremediation processes did not introduce any unexpected chemistry. However, the wells that were treated anaerobically still had water with a negative oxidation-reduction potential and had no recontamination with migrating trichloroethylene as opposed to the aerobic wells that had both positive redox potentials and trichloroethylene present. Also, chemical treatment using Fenton's reagent did not result in any long-term changes in the well chemistry, with the exception of inducing a slight acidity. This is due to the facts that addition of iron into the aquifer that is already in contact with iron-rich clay soil had little long-term effects and the radical chemistry with hydrogen peroxide is short-lived due to its reactivity. KMnO(4)-based remediation results in deposition of new materials containing manganese in elevated oxidation states that may provide long-term protection against the build up of chlorinated organic compounds.
研究了用于修复氯化溶剂的注入材料的持久效果。在本研究大约两年前，在俄克拉荷马城东南部的一个区域测试了四种不同的修复方法。这些方法包括厌氧和好氧条件下的生物修复以及使用芬顿试剂或高锰酸钾的化学修复。本次调查中进行的一系列水质测试表明，生物修复过程未引入任何意外的化学物质。然而，厌氧处理的水井中的水仍然具有负氧化还原电位，并且没有三氯乙烯迁移造成的再污染，而好氧水井的氧化还原电位为正且存在三氯乙烯。此外，使用芬顿试剂的化学处理除了引起轻微酸度外，并未导致水井化学性质的任何长期变化。这是因为向已经与富含铁的粘土土壤接触的含水层中添加铁几乎没有长期影响，并且由于其反应性，与过氧化氢的自由基化学反应是短暂的。基于高锰酸钾的修复导致含有高氧化态锰的新材料沉积，这可能为防止氯化有机化合物的积累提供长期保护。
