人工回灌条件下地下温度要素对氯苯吸附行为的影响研究

Study on the Effect of Underground Temperature on the Adsorption Behavior of Chlorobenzene under Artificial Recharge Condition

[目的]研究人工回灌条件下地下温度要素对氯苯吸附行为的影响。[方法]在前人研究的基础上,结合研究区人工回灌试验场地的实际条件,开展了人工回灌背景条件下氯苯的吸附行为研究。[结果]一定浓度条件下,氯苯的吸附反应符合准一级反应动力学和准二级反应动力学方程,温度升高,吸附速率增加,达到平衡时间缩短12(0℃)、10(10℃)、8 h(20℃)。不同浓度条件下,氯苯的吸附符合等温吸附方程,温度升高,达到吸附平衡时的介质吸附量增加,Langmuir模型计算出0、10、20℃的最大吸附量qm分别为20.747、21.505和23.364μg/g。[结论]氯苯在含水层介质中吸附反应是吸热反应,确定人工回灌的最佳季节是夏季。

[ Objective] The research aimed to study the effect of underground temperature on the adsorption behavior of chlorobenzene under artificial recharge condition. [ Method] Based on the prior researches, combining actual condition of the artificial recharge test site, the ad- sorption behavior of chlorobenzene at different temperatures during artificial recharge was discussed. [ Result] The adsorption reaction of chlo- robenzene corresponded with pseudo-first-order and pseudo-second-order kinetic equations at certain concentration. When temperature rose, the reaction rate accelerated, and the equilibrium time shortened by 12 （0 ℃ ）, 10 （ 10 ℃ ） and 8 h （20 ℃ ）. The adsorption of chloroben- zene corresponded with isothermal adsorption models very well at different concentrations. When temperature ranged from 0 to 20℃, the amounts of chlorobenzene adsorption increased at equilibrium time. The maximal adsorption amounts calculated by Langmuir model were 20. 747, 21. 505, 23. 364μg/g at 0, 10 and 20 ℃, respectively. [ Conclusion] The adsorption of chlorobenzene in aquifer media was endo- thermic reaction, and the best season of artificial recharge was summer.