饱和区中非水相有机物溶解的实验研究  

Experimental study of nonaqueous phase liquids dissolution in saturated zone

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

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

出　　处：《化学工程》2008年第4期49-52,共4页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(20276048);天津市自然科学基金资助项目(06YFJMJC06800)

摘　　要：地下环境中非水相有机污染物通常会成为地下水污染的持久性污染源,因而更好地了解非水相污染物溶解的过程对于地下水污染和治理会有很大的帮助。采用实验室二维砂箱模拟饱和区地下水流动条件下,非水相甲基叔丁基醚溶解过程,主要考察非水相液体初始饱和度、分布区域大小和地下水流速对于溶解过程的影响。实验结果表明,非水相溶解过程初期水相中质量浓度很高,接近于溶解度,之后逐渐降低进入拖尾期;非水相初始饱和度越高流出质量浓度出现最高点的时间越晚,完全溶解所需时间越长;地下水流速提高会使平衡溶解期变短,而且会减少完全溶解所需的时间;非水相液体源范围越大,出口峰值质量浓度越高,但是峰值出现时间越晚。When nonaqueous phase liquids （NAPLs） are present in the subsurface, they frequently serve as long-term sources of pollution. A small two-dimensional sandbox was developed to model the dissolution process of methyl-tertbutyl ether （MTBE） in saturated zone. The effects of initial NAPL saturation, the distribution of NAPL source and groundwater flux on the dissolution of MTBE were considered. The experimental results showed that the dissolution concentrations were initially close to the solubility limit, but then decreased steadily until most of the NAPL mass was removed. Moreover, a high NAPL saturation could increase the lag time; but a higher groundwater flux shortened the lag time; the width of NAPL source enhanced, that is the distribution of NAPL enlarged resulted in a significant increase of aqueous phase concentration, but the time for maximum concentration observed was later.

关 键 词：非水相液体 甲基叔丁基醚 地下水 溶解 

分 类 号：X523[环境科学与工程—环境工程]