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: 3755069
• 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/3755069
• 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.

我们建议获取有关破坏的基本动力学数据 超临界水中氧化造成的危险模型化合物。 这项工作已经从模型组件的识别开始。 选择过程的重要标准包括频率 地下水污染事件的发生情况、毒性程度、 以及化学结构和键合特性（型号是 化合物是更复杂化学品的良好替代品？）含有 混合溶剂和无机盐在泵送和- 治疗型补救程序。 例如，占主导地位的化学品 在阿伯霍纳盆地的地下水中发现的研究包括 三氯乙烯、苯和甲苯，其盐主要为 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 特征来选择代理。 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组件来识别和分离 所涉及的具体化合物。 我们的具体方法涉及实验和理论的结合 建模工作以确定全局动力学表达式并解释 机械途径。 在非设计条件下运行的影响 关于产品分布和销毁效率的研究将持续一段时间 温度、压力和反应器停留时间范围广。 此外，反应中间体的热力学稳定性将 还需要研究它们对反应堆性能的影响。 这 我们获得了模型化合物氧化的新动力学数据 超临界水将允许对该过程进行评估 修复技术。 首次定量动力学 测量将在等温条件下对混合饲料进行 部分氧化产物的热力学稳定性为 根据它们对反应堆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显示 通过其对超临界温度的影响提高稳定性 氧化速率和最终产品分布尚不清楚。