Analysis for Gas Behaviors of the Groundwater Pollutant (Volatile Chlorinated Organic Compound) in Unsaturated Zone-for the Design of the Remediation Method by the Vacuum Extraction Technique-

非饱和带地下水污染物（挥发性氯化有机物）气体行为分析-真空抽提技术修复方法设计-

基本信息

批准号：
04555127
负责人：
MURAOKA Kohji
金额：
$ 4.54万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

项目摘要

1.Characteristic of gaseous polluted material in porous medium : (1) In case of 1D column experiment, the characteristic of the vertical movement is depend on the diffusion in the porous medium. It is explained by using the diffusion coefficient in the air multiplied by the coefficient related to the porosity. (2) In case of 2D tank experiment, the expansion of the trichloroethylene gas in unsaturated zone is explained. The behavior in case of the solution is similar to one in case of the undiluted solution. And the proportional relation between concentration of the solution and one of the gas is made certain. (3) The 2D behavior of the volatile gas, when the vacuum extraction is carried out, is made clear. It depends on the value of the vacuum, and also on the surface boundary condition.2.Research of contaminated area : (1) The surface soil-gas survey in polluted area is effective for a soil and groundwater research in a shallow zone. (2) The remedial operation in the contaminated site is carried out. The removed rate of the pollutant at the initial stage of the operation is high. According to progress of the operation, its rate is decreased and the recovery rate by groundwater extraction is over the one by soil-gas extraction. (3) It is important to select the suitable remediational technique, according to the existing form of contaminant and to the progress of the recovery. The suitable standard to finish the operation and the method to evaluate the effect of the remedial operation are required.

1.多孔介质中气态污染物质的特性： (1)在一维柱实验中，垂直运动的特性取决于多孔介质中的扩散。这是通过使用空气中的扩散系数乘以与孔隙率相关的系数来解释的。 (2)在二维罐实验中，解释了三氯乙烯气体在不饱和区的膨胀。该溶液的行为与未稀释溶液的情况类似。并且确定了溶液的浓度与其中一种气体的浓度之间的比例关系。 (3) 明确了真空抽气时挥发性气体的二维行为。它取决于真空度的大小，也取决于地表边界条件。 2.污染区研究： (1)污染区地表土壤气体调查对于浅层土壤和地下水研究是有效的。（二）开展污染场地修复作业。运行初期污染物去除率较高。随着作业的进展，其回收率逐渐降低，但地下水抽取的回收率高于土壤-天然气抽取的回收率。 (3)根据污染物的存在形态和修复进度，选择合适的修复技术。需要有合适的完成手术的标准和评估补救手术效果的方法。