Pełech Robert, Milchert Eugeniusz, Wróbel Rafał
Institute of Chemical Organic Technology, Szczecin University of Technology, Pulaskiego 10, 70-322 Szczecin, Poland.
J Hazard Mater. 2006 Oct 11;137(3):1479-87. doi: 10.1016/j.jhazmat.2006.04.023. Epub 2006 Apr 25.
The results and a numerical simulation of studies on dynamics of the adsorption from seven-component aqueous solution of light chlorinated hydrocarbons on activated carbon have been presented. Aqueous solution of 1,2-dichloroethane (12DCE), 1,1,2,2-tetrachloroethane (S-TET), chloroform (CHCl(3)), carbon tetrachloride (CCl(4)), 1,1-dichloroethene (VDC), perchloroethene (PER) and 1,1,2-trichloroethene (TRI) was used. Concentrations of chlorohydrocarbons were similar as in wastewater from vinyl chloride plant. A cell model that incorporates the diffusion through a laminar layer of liquid around a particle was used to describe the experimental results. The applied calculation methods, which take kinetics into account, allows to well describe a phenomenon of dynamic adsorption. Mean relative deviations between the experimental and calculated values amounted 17%. The breakthrough curves become steeper along with an increase of the bed height. A consistency of the experimental results with those calculated indicates for a negligible contribution of the axial diffusion on the dynamic adsorption process of light chlorinated hydrocarbons from aqueous solution under the hydrodynamic conditions corresponding to the Reynolds number equal to 1.3. Determined optimal bed height for waste linear flow rate-15 cm/min is in the range 80-120 cm.
本文给出了轻质氯代烃七组分水溶液在活性炭上吸附动力学研究的结果及数值模拟。所用的水溶液包含1,2 - 二氯乙烷（12DCE）、1,1,2,2 - 四氯乙烷（S - TET）、氯仿（CHCl₃）、四氯化碳（CCl₄）、1,1 - 二氯乙烯（VDC）、全氯乙烯（PER）和1,1,2 - 三氯乙烯（TRI）。氯代烃的浓度与氯乙烯厂废水中的浓度相似。采用一个包含通过颗粒周围液层扩散的池模型来描述实验结果。所应用的考虑动力学的计算方法能够很好地描述动态吸附现象。实验值与计算值之间的平均相对偏差为17%。随着床层高度的增加，穿透曲线变得更陡。实验结果与计算结果的一致性表明，在对应雷诺数等于1.3的流体动力学条件下，轴向扩散对轻质氯代烃从水溶液中的动态吸附过程的贡献可忽略不计。确定的废水平均流速为15 cm/min时的最佳床层高度在80 - 120 cm范围内。
