液固比对土壤洗涤去除多环芳烃效果的影响  

Influence of Operating Parameters on Surfactant-enhanced Washing to Remedy PAHs Contaminated Soil

作　　者：吴威[1] 姜林[2] 陈家军[1] 彭胜[1] 

机构地区：[1]北京师范大学环境学院,水沙科学教育部重点实验室,北京100875 [2]北京市环境保护科学研究院,北京100037

出　　处：《环境科学》2012年第3期965-970,共6页Environmental Science

基　　金：北京市科技计划重大项目(SF2008-02);中央高校基本科研业务费专项(2009SD-19)

摘　　要：液固比是影响土壤洗涤污染物去除率的重要因素.以Triton X-100和Tween-80为洗涤剂,采用洗涤去除率(R)、吸附损失率(Vs)和新定义的指标增溶百分比(SP)分析液固比对土壤洗涤去除目标多环芳烃效果的影响.结果表明,液固比对土壤洗涤去除多环芳烃效果影响显著.R随液固比增加呈非线性形式增大,液固比10∶1后R增长变缓.同一液固比时,洗涤去除率Triton X-100>Tween-80.Vs随液固比增加显著减少,液固比10∶1后逐渐变缓.同一液固比时,吸附损失率Triton X-100<Tween-80.SP在液固比10∶1时呈最大峰值后随液固比增加又减小.结合R、Vs和SP,液固比10∶1应为洗涤有效点,Triton X-100应是理想洗涤剂,SP是一个有效的指标用于土壤洗涤中液固比的选择.Triton X-100为洗涤剂、液固比10∶1时,R、Vs和SP分别为:74.7%、23.47%和48.99%.Liquid/solid ratio（L/S） is an important influencing factor on contaminant removal in soil washing.The impact of different liquid/solid ratio on washing performance with Triton X-100 and Tween-80 was studied respectively and evaluated through removal ratio（R）,surfactant adsorption loss ratio（Vs） and solubilization percent（SP）.The results presented that the performance of washing to remove PAHs in soil was significantly affected by liquid/solid ratio.PAH removal ratio was gradually increased with liquid/solid ratio increasing in the non-linear form,R presented nonlinear increasing until L/S=10∶1.Surfactant adsorption loss ratio was insignificantly decreased.At the same liquid/solid ratio,removal ratio of Triton X-100 is more than that of Tween-80.Vs presented drastic decreasing until L/S=10∶1,adsorption loss ratio of Triton X-100 is less than that of Tween-80.SP was decreased after maximum value is occurred at L/S=10∶1.Combining with R,Vsand SP,L/S=10∶1 should be an effective washing point,Triton X-100 should be a reasonable washing solution and SP is a more effective index to chose liquid/solid ratio.When Triton X-100 is as washing solution and L/S=10∶1,R,Vsand SP is 74.7%,23.47% and 48.99%,respectively.

关 键 词：土壤洗涤 液固比 多环芳烃 增溶百分比 表面活性剂 吸附损失率 

分 类 号：X53[环境科学与工程—环境工程]