REMEDIATION TECHNOLOGY--OXIDATION OF HAZARDOUS CHEMICALS IN SUPERCRITICAL WATER

修复技术--超临界水中有害化学物质的氧化

• 批准号: 3840728
• 负责人: JEFFERSON W TESTER
• 金额: --
• 依托单位: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/3840728
• 关键词: atmospheric pressure; carbon monoxide; chlorine; ground water; industrial waste; ionic strengths; oxidation; salts; soil; temperature; thermodynamics; waste treatment; water pollution; water pollution control

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.

我们正在提议获取关于核爆炸破坏的基本动力学数据 在超临界水中氧化的危险模型化合物。 这项工作已经从识别模型组件开始。 对遴选过程很重要的标准包括 地下水污染事件的发生情况、毒性程度、 以及化学结构和成键特性(是模型 化合物是更复杂化学物质的良好替代品？)含有以下物质的废物 混合溶剂和无机盐在抽油泵中尤为重要。 治疗类型补救程序。例如，主要的化学物质 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，其盐主要是 砷和铬。涉及有机物和盐类的多相进料 溶解在水中并吸收到土壤颗粒中也会 以选择代理人为特征的。这些PIC化合物将是 以核心毒理学实验室为特征来确定致突变性 并通过核心分析实验室组件进行识别和分离 所涉及的特定化合物。 我们的具体方法包括实验和理论相结合。 建模工作，以确定全球动力学表达式并解释 机械化的道路。在非设计条件下运行的影响 关于产品分配和销毁效率的研究将在 广泛的温度、压力和反应堆停留时间范围。 此外，反应中间体的热力学稳定性将 也可以从它们对反应堆性能的影响方面进行研究。这个 关于模型化合物氧化的新的动力学数据 超临界水将允许将这一过程评估为 用于补救的技术。第一次，量化动力学 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 考虑到它们对反应堆性能的潜在影响进行了审查。 固体(氧化物和盐)和复杂的有机化合物 在超临界温度下通过它们的影响提高稳定性 氧化速度和最终产物分布尚不清楚。