膜科学与技术

渗透汽化法处理甲醛废水的实验研究

作者：丁少杰a，郭亚红a，李雪茹 a，樊文玲b，张晶a，李磊a，张志炳a

单位： a南京大学化学化工学院化工系，江苏南京 210093; b 南京中医药大学药学院，江苏南京 210029

关键词：渗透汽化硅橡胶/醋酸纤维素复合膜甲醛废水表观活化能透过侧压力

出版年,卷(期):页码： 2011,31(5):64-68

摘要：

本文采用硅橡胶（PDMS）/醋酸纤维素(CA)复合膜对甲醛废水溶液进行渗透汽化处理，通过改变料液温度，料液浓度等因素考察其对渗透通量及分离因子的影响。实验结果表明，一定温度范围内，该体系的渗透汽化过程存在一个最佳的分离因子；在研究处理浓度为1%甲醛废液时，透过侧压力为13KPa时，在50℃下可以达到最佳的分离效率，此时甲醛的渗透通量可达到110 g/（m2•h），分离因子为1.75，但随着透过侧压力的增高，渗透通量线性降低，分离因子降低；同时研究表明料液浓度越高，膜的渗透通量越大，但最佳分离因子几乎没有改变; 通过Arhenius关系式，得出该复合膜的表观活化能为27.57KJ/mol。与其它甲醛废水分离方法相比，渗透汽化法具有设备简单，操作方便，费用低廉等特点，为工业化的应用提供了新的技术尝试。

The experiments were carried out to separate formaldehyde wastewater by pervaporation with PDMS/CA composite membranes. The influence of feed temperature and feed concentration of formaldehyde aqueous solution on the permeation flux and separation factor of formaldehyde was investigated thoroughly. Experimental results have indicated that there is an optimal separation factor for pervaporation process over a range of temperatures. When dealing with formaldehyde wastewater with feed concentration of 1% at 50℃ and under permeation pressure of 13KPa, this composite membrane can reach excellent separation efficiency with up to 110 g/（m2•h）of flux and up to 1.75 of separation factor. Under this condition, permeation flux decreases linearly and separation factor also reduces when the permeation pressure increases. Besides, the higher the concentration is, the larger the permeation flux is, but there is no obvious change on the separation factor. Apparent activation energy of the composite membrane could also been achieved by Arrhenius equation and the calculated value is considered as 27.57KJ/mol. Compared with other methods of separating formaldehyde wastewater, pervaporation has such many advantages as simple equipment, convenient operation and low cost , which can offer a new and effective technical attempt for industrial application of formaldehyde wastewater treatment.

第一作者简介丁少杰(1984-），女，硕士研究生，主要研究方向为膜分离，籍贯山西。联系人李磊,博士,副教授,主要从事膜分离技术研究。电话025-83596665;E-mail ll-nju@163.com；地址江苏省南京市汉口路22号南京大学化工系

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