膜科学与技术

乙腈在高盐废水中的渗透汽化行为研究

作者：马腾飞¹，王勇¹，薛长菁¹，张奕¹，纪敏²，李月刚²

单位： 1．污染控制与资源化研究国家重点实验室，南京大学，南京，210023； 2．太仓中化环保化工有限公司，太仓，215433

关键词：渗透汽化；乙腈；PDMS；复合膜；废水

出版年,卷(期):页码： 2018,38(5):88-93

摘要：

某化工产品生产过程中要排放大量的含乙腈、高盐度的工业废水，处理难度大。本研究采用了PDMS渗透汽化膜，考察了从废水中回收乙腈的可行性，研究了温度、乙腈浓度、料液中含盐量等因素对分离性能的影响。结果表明：温度为40℃时，可以将起始浓度为36060 mg/L的乙腈浓缩到47%以上，过膜通量为353g/m2 h，分离因子大于20。研究表明使用渗透汽化膜能够从废水中回收乙腈，实现资源化，废水处理具有效率高、能耗低，无二次污染物的特点。

Acetonitrile wastewater is toxic and hazardous. Acetonitrile in high-salt wastewater is refractory and difficult for wastewater treatment. In this work, separation and recovery of acetonitrile from high-salt aqueous streams by pervaporation were investigated, the influences of operating conditions(e.g. acetonitrile feed concentration, temperature, feed flowrate, salt concentration) were evaluated. Results shows that an increase in concentration implies higher fluxes ,whereas a rise in temperature implies higher flux and reduction of the separation factor. The activation energy for the permeation of acetonitrile and water through the membrane indicated that the pervaporation of acetonitrile is more highly temperature dependent than water. The maximum permeate flux achieved was 353g/m2h，and the highest concentrations of acetonitrile in the permeate was found to be more than 47% . The pervaporation process offers a prospect for the treatment and recovery of hazardous acetonitrile wastewater because of the high acetonitrile concentration of the permeate and the possibility for its reuse.

第一作者简介：马腾飞（1986-），男，山东潍坊人，硕士生，主要从事分离膜技术、化工废水处理研究 *为通讯联系人，E-mail: wangyong@nju.edu.cn

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