邻苯二甲酸二甲酯在颗粒活性炭中的穿透特性

在25℃条件下,研究了颗粒活性炭(GAC)对水中邻苯二甲酸二甲酯（DMP）的动态吸附特性及其影响因素.在不同进水流量（0.65～4 mL·min^-1）、GAC粒径（550～1　250　μm）、DMP初始浓度（50～400　mg·L^-1）和GAC炭量（0.75～1.4 g）条件下,考察了DMP在GAC柱中的穿透特性.研究表明,GAC对DMP的吸附容量较大,Yoon-Nelson模型能够很好地拟合各种工况下的动态穿透曲线;动态吸附容量随着进水流量和GAC粒径的增大而减小,相反,随着DMP初始浓度和GAC炭量的增大而增大.根据试验数据和Yoon-Nelson模型计算出穿透参数K′、T和穿透点t₁以及平衡点t₂.在建立了各影响因素与Yoon-Nelson穿透模型参数之间的关系基础上,得到了活性炭柱出水浓度与穿透时间和各影响因素之间的动态关系模型.

Breakthrough Characteristics of Dimethyl Phthalate in Granular Activated Carbon

The dynamic adsorption characteristics of dimethyl phthalate (DMP) in water by granular activated carbon (GAC) were investigated. A series of column tests were conducted to determine the breakthrough characteristics, with effects of various water flow rate (0.65 - 4 mL x min(-1)), particle diameter of GAC (550 - 1 250 microm), influent concentration of DMP (50 - 400 mg x L(-1)), and quantity of GAC (0.75 - 1.4 g) taken into consideration. As a matter of fact, the high DMP adsorption capacity could be achieved by GAC, and the Yoon-Nelson model was found to fit the breakthrough curves well under all the conditions; the dynamic adsorption capacity decreased with increasing water flow rates or particle diameter of GAC, but increased with growing influent concentrations of DMP or quantity of GAC on the contrary. The values of breakthrough parameters of Yoon-Nelson model, such as K', T, breakthrough time (t1) and balance time (t2) were obtained by experimental data through calculation. On the basis of the relations between every influencing factors and above parameters of Yoon-Nelson model, taking influence factors and breakthrough time into account, the dynamic model were set up, which can be used to indicate the relationship between the effluent concentration of DMP from GAC column and breakthrough time under different initial parameters.