Tween20和SDS冲洗修复硝基苯污染土壤的实验研究

The Experimental Research on the Flushing of Nitrobenzenecontaminated Soil by Tween20 and SDS

文章研究了非离子表面活性剂Tween20和阴离子表面活性剂SDS对硝基苯的增溶作用和对硝基苯污染土柱的冲洗作用。选用浓度高于CMC的表面活性剂进行增溶实验,选用不同浓度的Tween20和SDS对含有硝基苯的土柱进行冲洗,实验结果表明,Tween20与SDS的浓度与其对硝基苯的增溶量之间存在一定的线性关系,Tween20对硝基苯的增溶性要强于SDS的增溶性。冲洗实验表明,在冲洗的不同阶段,冲洗出硝基苯的量也是不同的。在冲洗前期,表面活性剂浓度越高,冲洗出硝基苯的量越少,在冲洗后期,表面活性剂浓度越高,冲洗出硝基苯的量越多,Tween20的冲洗效果要强于SDS。文章还研究了阴非混合表面活性剂对污染土壤的冲洗效果,阴非混合表面活性剂对硝基苯污染土壤的冲洗没有协同作用,但是在阴非混合表面活性剂冲洗实验过程中,不同比例的复配,冲洗出硝基苯的量也不同。

This paper studies about the solubilization effect of non-ionic surfactant Tween20 and anionic surfactant SDS on nitrobenzene and the flushing effect on nitrobenzene-contaminated soil.The solubilizing experiment by the surfactants with the concentration above CMC was conducted,the soil column containing nitrobenzene was flushed by Tween20 and SDS with different concentrations.The experimental results indicate that the concentration of Tween20 and SDS and their solubilizing effect on nitrobenzene have linear relation,and the solubilization of nitrobenzene by Tween20 is stronger than SDS.The flushing experiments indicate that,in different flushing stages,the amount of nitrobenzene that was flushed out was also different.In the early stage,the higher the surfactant concentration was,the less the amount of nitrobenzene that was flushed out was,In the later stage,the higher the surfactant concentration was,the more the amount of nitrobenzene that was flushed out was,and the flushing effect of Tween20 is better than SDS.This paper also studies the flushing effect of the mixture of an ionic and non-ionic surfactant on contaminated soil,which shows that they have no synergistic effect on the flushing of ni trobenzene-contaminated soil.However,in the flushing experiment of the mixture of anionic and non-ionic surfactant,when the surfactants are mixed according to different mixed proportions,the amount of nitrobenzene that is flushed out is also dif ferent.