聚丙烯酸钠污染阴离子交换膜的清洗方法

聚丙烯酸钠对阴离子交换膜的污染是影响双极膜电渗析回收丙烯酸丁酯废水中有机酸的关键因素之一。针对该问题研究开发了聚丙烯酸钠污染后离子交换膜的清洗方法,并采用膜电阻、迁移数、表面X射线光电子谱(XPS)分析等对膜清洗效果进行了表征。NaOH、NaCl和HCl溶液3种清洗液对离子交换膜的机械清洗及超声强化清洗效果表明,HCl溶液对聚丙烯酸钠污染阴离子交换膜的清洗效果最好,超声波可促进NaOH、NaCl和HCl溶液的清洗效果。采用2.0 mol L的HCl溶液对受污染阴离子交换膜进行超声清洗,其膜电阻和迁移数可基本恢复到未污染膜的水平。

ELECTRIC REGENERATION METHOD OF IONEXCHANGE RESIN IN THE MIXED BED

In this paper the self-regeneration process of the mixed resins consisting of cationand anion ion exchangers in the electrolialyser of the packed bed is analyzed and anelectric regeneration method is put forward to supply the desalinated water by mixedbed The electric regeneration technology is a new one used for regeneration of theexhausted ion exchangers in the mixed bed instead of the traditional regeneratingprocess by using acid and abc liquor Electric energy is consumed to regenerat theion exchangers loaded by salts from water treatment without any chemicals- acid alkali. The advantage of the electric regeneration process edibited convenientoperation, no discharge any waste, and therefore no Polluted to the recehang waterbode and the environmental ground

焦化生化出水电渗析脱盐研究

采用电渗析技术对焦化生化出水如曝气生物滤池出水及反渗透浓水进行脱盐,考察不同废水中的离子迁移、废水脱盐及离子交换膜污染情况。结果表明:2种焦化废水采用电渗析处理具有较好的脱盐效果,其中不同离子的迁移脱除与其浓度、离子半径等密切相关。膜电阻测试表明,不同焦化废水电渗析体系中不同离子交换膜的污染存在差别。扫描电镜和红外分析表明,曝气生物滤池出水主要由有机物造成阴离子交换膜污染,而反渗透浓水主要在电渗析浓室侧的膜表面形成颗粒状的无机污染,且阳膜浓室侧比阴膜浓室侧更显著。