THERMAL REMEDIATION

铬在一个简单的层流扩散火焰中的命运将被研究 在项目的第一阶段。铬的氧化态 火焰中形成的气溶胶将被确定为 火焰温度和停留时间。氯对环境的影响 将在该不均匀系统中测试铬的命运。的 铬可能包含在排放的烟尘颗粒中， 火焰也将通过收集火焰上方的烟灰来评估， 是用铬种的。气相对健康的影响， 从火焰中喷出的颗粒相材料将被 与使用各种生物测定的小组合作进行研究。的 热修复小组还将与生物学家合作， 开发和测试用于监测的连续“在线”生物传感器 简单的实验室燃烧系统的火焰后气体， 氯化烃和铬。注意第二阶段的 该项目将致力于评价相对新颖， 商业热处理系统具有可能的应用， 在马雷岛海军造船厂等地进行土壤通风作业 在旧金山弗朗西斯科附近。这两项将被测试的技术是一个加热 陶瓷床和催化系统。两者都在较低的温度下工作 比焚化炉。它们在不同的条件下没有得到很好的测试， 氯负载和可能的金属污染。一个简单的实验 模型将开发的加热陶瓷床和催化系统 即，在平面上的驻点流动。测量 物种和温度将阐明氧化的性质 在这些技术中，特别是蒸汽组合物， 在土壤通风操作期间发现随时间变化。的条件 可能导致的健康危害将被评估。铅可能存在于 被含铅汽油污染了铅蒸气对 热处理和催化处理方法的操作将 评估。主角的命运将由...

The fate of chromium in a simple, laminar diffusion flame will be studied in the first phase of the project. The oxidation state of the chromium aerosol that is formed in the flame will be determined as a function of the flame temperature and residence time. The impact of chlorine on the fate of the chromium will be tested in this inhomogeneous system. The possible inclusion of chromium into soot particles that are emitted from the flame will also be evaluated by collecting soot above a flame that is seeded with chromium. The health impact of the gas phase and particulate phase materials that are emitted from the flames will be investigated in collaboration with groups using various bioassays. The thermal remediation group will also collaborate with biologists in developing and testing a continuous, "on-line" bio-sensor for monitoring the postflame gases from simple laboratory combustion systems with chlorinated hydrocarbons and chromium. Attention in the second stage of the project will be directed towards the evaluation of relatively novel, commercial thermal treatment systems that have a possible application to soil venting operations at sites such as the Mare Island Naval Ship Yard near San Francisco. The two technologies that will be tested are a heated ceramic bed and a catalytic system. Both operate at lower temperatures than incinerators. They are not well tested under varying conditions of chlorine loading and possible metal contamination. A simple experimental model will be developed for the heated ceramic bed and catalytic systems viz., a stagnation point flow against a flat surface. Measurements of species and temperatures will elucidate the nature of the oxidation process in these technologies, especially with vapor composition that varies with time as found during soil venting operations. Conditions that may lead to health hazards will be evaluated. Lead may be found in sites that are contaminated with leaded gasoline. The impact of lead vapor on the operation of the thermal and catalytic treatment methods will be evaluated. The fate of the lead will be determined..