模拟多相抽提去除地下水中甲苯的过程监测与传质试验  

Process Monitoring and Mass Transfer in Simulated Multi-Phase Extraction for Toluene Removal in Groundwater

作　　者：张祥 ZHANG Xiang(Shanghai Municipal Engineering Design Institute〈Group〉Co.,Ltd.,Shanghai 200092,China)

机构地区：[1]上海市政工程设计研究总院〈集团〉有限公司,上海200092

出　　处：《净水技术》2020年第S01期21-26,49,共7页Water Purification Technology

基　　金：上海市“科技创新行动计划”社会发展领域项目(18DZ1204303)。

摘　　要：研究三维砂箱模拟装置中多相抽提修复甲苯污染地下水过程关键参数的影响规律和污染物传质的去除效果.结果表明,多相抽提修复过程真空度是影响修复效果的关键参数,真空度的变化影响管路的摩擦阻力损失、气液相抽提流量和最终修复效果.通过真空度监测结果分析,可确定多相抽提影响范围.连续多相抽提修复过程中,气液相流量和污染物浓度均逐渐降低,初期以液相去除为主,后期以气相去除为主.经10 h抽提后,砂土和地下水中甲苯去除率均达到99%以上.抽提修复效果随抽提管径向距离降低,边界残余污染高.The influence of key parameters and the effect of pollutant mass transfer in multi-phase extraction process of toluenecontaminated groundwater remediation in a three-dimensional sandbox simulator were studied.The results showed that the vacuum in multi-phase extraction process was a key parameter that affected remediation results.The change of vacuum affected friction resistance loss of the pipeline,vapor-liquid extraction flow rate and final remediation result.The influence range of extraction remediation was determined with the analysis of vacuum monitoring results.During continuous multi-phase extraction process,vapor-liquid flow and pollutant concentration were gradually reduced.The liquid phase was the main removal form in the early stage which was vapor phase in the later stage.After 10 h's extraction,removal rates of toluene in sand and groundwater both reached more than 99%.The effect of extraction remediation decreased with radial distance to extraction tube,and the most residual pollution was found at the boundary.

关 键 词：地下水修复 多相抽提 模拟 过程监测 甲苯 

分 类 号：X523[环境科学与工程—环境工程]