REMEDIATION TECHNOLOGY--OXIDATION OF HAZARDOUS CHEMICALS IN SUPERCRITICAL WATER

我们建议获得销毁下列物质的基本动力学数据： 在超临界水中氧化危险模型化合物。 这项工作已经从确定模型组成部分开始。 选择过程的重要标准包括： 地下水污染事件的发生率，毒性程度， 化学结构和键合特性（模型 化合物更复杂的化学品的良好替代品？） 含汞 混合溶剂和无机盐在泵和- 处理类型的补救程序。 例如，主要化学物质 在阿伯乔纳盆地的地下水中发现的研究包括 三氯乙烯、苯和甲苯，主要是 砷和铬。 涉及有机物和盐的多相进料 溶解在水中并被土壤颗粒吸收， 其特征在于选择替代物。 这些PIC化合物将 由核心毒理学实验室表征，以确定致突变性 并由核心分析实验室的组成部分，以确定和分离 所涉及的特定化合物。 我们的具体方法涉及一个耦合的实验和理论 建模工作，以确定全球动力学表达式，并解释 机械路径。 在非设计条件下运行的影响 对产品分布和销毁效率的影响， 温度、压力和反应器停留时间范围宽。 此外，反应中间体的热力学稳定性将 还可以研究它们对反应器性能的影响。 的 新的动力学数据，我们获得的模型化合物的氧化， 超临界水将允许评价该过程作为一种 补救技术。 第一次，定量动力学 将在等温条件下对混合饲料进行测量 部分氧化产物的热力学稳定性将是 根据其对反应器性能的潜在影响进行检查。 固体（氧化物和盐）和复杂的有机化合物已经显示出 在超临界温度下的稳定性增加， 氧化速率和最终产物分布是未知的。

We are proposing to obtain fundamental kinetic data on the destruction of hazardous model chemical compounds by oxidation in supercritical water. This work has already begun with identification of model components. Criteria important to the selection process include frequency of occurrence in ground water contamination incidents, degree of toxicity, and chemical structure and bonding characteristics (Are the model compounds good surrogates for more complex chemicals?) Wastes containing mixed solvents and inorganic salts are particularly important in pump-and- treat type remediation procedures. For example, the dominant chemicals found in the groundwater of the Aberjona Basin studies include trichloroethylene, benzene, and toluene with salts predominately of arsenic and chromium. Multiphase feeds involving organics and salts dissolved in water and absorbed to soil particles will also be characterized to select surrogates. these PIC compounds will be characterized by the core toxicology laboratory to determine mutagenicity and by the core analytical laboratory components to identify and separate the specific compounds involved. Our specific approach involves a coupled experimental and theoretical modeling effort to determine global kinetic expressions and to interpret mechanistic pathways. The effects of operating at off-design conditions on product distribution and destruction efficiency will be studied over a wide range of temperature, pressure and reactor residence times. Furthermore, the thermodynamic stability of reaction intermediates will also be studied in terms of their influence on reactor performance. The new kinetic data we obtain on the oxidation of model compounds in supercritical water will permit the evaluation of this process as a technology for remediation. For the first time, quantitative kinetic measurements will be conducted on mixed feeds under isothermal conditions and the thermodynamic stabilities of partial oxidation products will be examined in light of their potential influence on reactor performance. Solids (oxides and salts) and complex organic compounds have shown increased stability at supercritical temperatures by their effect on oxidation rates and final product distribution is not known.