表面活性剂对人工污染土壤装填土柱中PAHs迁移渗透的影响

研究了阴离子表面活性剂十二烷基苯磺酸钠(LAS)对人工污染土壤中多环芳烃(PAHs)的淋洗效果,土柱分为2层,上层为人工污染PAHs的土壤(1cm ),下层为清洁土壤(9cm).实验结果表明,5CMC(临界胶束浓度) LAS促进了土柱中PAHs的迁移渗透.低环PAHs的穿透曲线基本符合正态分布,4环以上PAHs相对淋溶率较低,低于10%.与表面活性剂溶液穿透曲线相比,PAHs的淋溶均有滞后现象,而且随着环数的增加,PAHs淋溶滞后现象越加明显.分析人工污染土柱中PAHs的相对淋溶率与其辛醇水分配系数的关系,发现两者之间有显著负相关性.

Influences of Surfactant on the Transport of PAHs in Artificially Contaminated Soil Columns

The effect of anionic surfactant LAS on leaching of PAHs from artificially contaminated soil was studied. The interaction of these processes were studied in a two-layer column experiment with a base layer of uncontaminated soil(9cm) and a top layer of artificially contaminated soil(1cm). Results show that 5 critical micelle concentration (CMC) LAS enhanced the transport of PAHs. The breakthrough curves of low ring PAHs followed the normal distribution and the relative leaching ratios of 4 or more rings PAHs were low, and not more than 10%. The transport of PAHs was retarded compared with LAS, and the high ring PAHs were retarded more significantly. Linear correlation was observed between the relative leachability of the individual PAHs and the octanol/water coefficient of PAHs.