均匀电场下多环芳烃在土壤中的迁移

Migration of polycyclic aromatic hydrocarbons in soils under uniform electric field

当循环电解液流速为800 mL/h,电解液为无菌水时,电渗流流量、菲和芘在土壤中迁移量在电压梯度为1 V/cm作用下比电压梯度为0.5 V/cm时要多;电动注入表面活性剂Tween80和HPCD均可以提高菲和芘在土壤中的迁移,注入Tween80和HPCD浓度分别为500和1 000 mg/L时,相应地Phe提高5.8倍和11.7倍、芘提高2倍和3.4倍;而BaP在水中的溶解度太小,电场作用和电动注入表面活性剂对BaP在土壤中的迁移量影响很小。为建立电动修复有机污染物污染提供了技术基础。

When the experiments were carried out at electrolyte circulation velocity of 800 mL/h and electrolyte using sterile water, the amount of electroosmotic flow and migration mass of phenanthrene and pyrene at the voltage gradient of 1 V/cm was greater than those at the voltage gradient of 0.5 V/era, respectively. Surfactants such as Tween80 and HPCD, can improve the total migration mass of phenanthrene and pyrene. And, the migration of the phenanthrene was elevated by 5.8 and 11.7 by electrokinetic injection of Tween 80 and HPCD at the concentrations of 500 and 1 000 mg/kg, respectively, while pyrene was 2 and 3.4 times. However, the total migration of benzol [a] pyrene was very small due to its solubility, even under the conditions of electric field and electrokinetic injection of surfactants. This study provides technological basis for the set-up of electrokinetic remediation for sites contaminated by organic pollutants.