曝气处理甲苯的传质机理  

Mass Transfer in Air Sparging Remediation of Toluene

作　　者：姜斌[1] 张英[1] 黄国强[1] 徐世民[2] 李鑫钢[1] 

机构地区：[1]天津大学化工学院,天津300072 [2]天津大学精馏技术国家工程研究中心,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2005年第2期163-166,共4页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(20276048).

摘　　要：曝气技术(AS)是处理地下水中石油污染的修复技术,具有低成本、高效率和原位操作等显著优势.通过自行设计安装的二维砂箱,结合AS的流型,对其进行了去除甲苯的传质研究.采用乙炔示踪法对AS的流型研究表明,在 0. 15m3 /h的乙炔曝气流量下,气体在地下水区域中分布非常均匀,形状近似为对称U字形.AS甲苯传质研究表明,在曝气过程中,空气可达到的区域是AS修复的主要区域,且甲苯的去除时间受空气含量的影响极大.曝气源附近的区域,其去除效率很高,经 400min曝气后,甲苯去除效率达 8000.Air sparging(AS) is an emerging remediation technique to remove petroleum contaminants from groundwater. Furthermore, it has obvious advantages of low-cost, high-efficiency, in-situ operation and so on. A two-dimensional experimental chamber was designed and installed for mass transfer study on toluene removal, combined with AS flow pattern research. The AS flow pattern obtained by using acetylene tracing measurement indicates that the gas is uniformly distributed in groundwater and the whole gas plume is formed with a roughly symmetrical U-shape structure when the acetylene is injected at 0.15 m^3/h. Mass transfer research on toluene during the air sparging indicates that the regions where injected air is able to reach are the main regions remediated of AS. Moreover, the contents of air greatly affect toluene removal time. The regions near the injection source experience significant removal during air sparging. After 400 min operation, toluene removal ratio is about 80~0_0.

关 键 词：曝气 乙炔示踪 传质 挥发 甲苯 地下水 

分 类 号：TQ085[化学工程]