活性炭对垃圾渗滤液中DEHP的吸附研究

Study on the Adsorption of DEHP in Leachate of Landfill with Activated Carbon

[目的]评估活性炭处理含邻苯二甲酸二(2-乙基己基)酯(DEHP)垃圾渗滤液的吸附特性。[方法]采用静态吸附法,研究了溶液的pH、活性炭用量及反应时间对活性炭吸附去除DEHP效果的影响,并利用Langmuir和Freundlich模型对吸附等温平衡过程进行了拟合。[结果]活性炭对DEHP的吸附效率随着活性炭用量和反应时间的增加而提高,当活性炭用量为0.1～0.5 g和反应时间为30～150min时,DEHP吸附效率分别为44%～87%和63%～88%;在试验条件下最佳pH为5.0。试验数据更加遵循Langmuir模型。[结论]为活性炭在垃圾渗滤液DEHP处理中的应用研究提供了理论依据。

[Objective] The aim was to estimate the the adsorption characteristics of DEHP in leachate of landfill with activated carbon（AC）.[Method] Using static method to study the effects of pH of aqueous solution,dosage of activated carbon and reaction time on the removal efficiency of DEHP by AC,and Langmuir and Freundlich model were used to fit adsorption isotherm balance process.[Result] The results showed that adsorption efficiency of DEHP by AC was improved with the increasing of adsorbent dosage and reaction time.Ranged from 0.1 to 0.5 g of activated carbon amount and reaction time located from 30 to 150 min,adsorption efficiency increased from 44% to 87% and from 63% to 88%,respectively.The optimum pH for the removal of DEHP from aqueous solutions under the experimental conditions was found to be 5.0.The model of DEHP removal by AC was well fitted with the Langmuir equation.[Conclusion] This result provided theoretical basis for the application of DEHP removal by AC.