活性炭固定床选择性去除表面活性剂溶液中菲.pdfVIP

活性炭固定床选择性去除表面活性剂溶液中的菲 杨琪 周文军 浙江大学环境与资源学院 310058 摘要：回收再利用表面活性剂是降低表面活性剂增效修复 (SER) 技术运行成本 并防止其淋洗液二次污染的有效途径。本研究利用活性炭固定床选择性去除 Triton X-100 (TX100) 溶液中的菲作为SER 技术中淋洗液回收的模拟方法，探讨 流速、床层高、菲初始浓度对回收效果的影响。研究发现 TX100 在固定床上能 够迅速达到饱和吸附，而菲的出水浓度始终远低于其初始浓度。所有实验条件下， 菲的去除率均大于TX100 的吸附损失，且选择性吸附系数均在4 以上，表示溶 液中 80%菲被去除而 80%表面活性剂可被回收。此外，增加床层高或降低流速 有助于提高选择吸附性，但菲初始浓度对其几乎没有影响。TX100 和菲的穿透曲 线能够使用数学模型有效拟合。研究表明固定床可作为 SER 技术中淋洗液处理 及回收的一种有效方法。 关键词：固定床；模型；选择性吸附；表面活性剂回收；淋洗液 Fixed-bed study and modeling of selective phenanthrene removal from surfactant solutions Qi Yang, Wenjun Zhou Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China ABSTRACT: Recovering and then recycling surfactant solution is required in the surfactant-enhanced remediation (SER) of contaminated sites and groundwater to reduce operating costs and prevent secondary contamination. In this study, fixed-beds with activated carbon were employed to selectively remove phenanthrene from Triton X-100 (TX100) aqueous solution as a potential model system for the recovery of surfactant solution in SER. The effects of various operating conditions such as flow rate, bed height, and influent phenanthrene concentration on the performance of the fixed beds were investigated. The sorption of TX100 in the fixed-bed can rapidly reach saturation, but the effluent concentrations of phenanthrene are much lower than its influent concentrations, even with a great volume of solution flowing through the columns. The total removal percentage of phenanthrene from effluent solution was greater than the sorption loss of TX100 under all experimental conditions. The corresponding selectivity parameters for phenanthrene removal versus surfactant sorption were all greater than 4.0