膜科学与技术

阴离子交换膜分离饮用水中Cr(Ⅵ)的研究

作者：陈世洋，施周，李学瑞，邓林

单位：湖南大学土木工程学院，建筑安全与节能教育部重点实验室，湖南长沙 410082

关键词：唐南(Donnan)渗析；离子迁移；阴离子交换膜；分离去除率

出版年,卷(期):页码： 2014,34(1):96-100

摘要：

基于Donnan渗析原理，采用阴离子交换膜无电压作用下分离饮用水中Cr(Ⅵ)。结果表明，当原水中Cr(Ⅵ)初始浓度为1.0 mg/L（0.0192 mmol/L），pH值为6.95，补偿溶液NaCl浓度为0.1 mol/L，原水和补偿溶液进水流量均为2.5 mL/min，膜两侧溶液搅拌强度为500 r/min，水温为25℃时，阴离子交换膜对Cr(Ⅵ)的分离去除率为86.4%。采用Na2SO4作为补偿溶液时，Cr(Ⅵ)的分离去除效果降低。调节原水pH值至11.0时，阴离子交换膜对Cr(Ⅵ)的分离去除率下降至78.9%。提高膜两侧溶液搅拌强度，给体池中Cr(Ⅵ)更容易通过膜迁移分离至受体池中。水温由10℃升高至40℃，给体池中Cr(Ⅵ)剩余浓度由0.21 mg/L下降至0.12 mg/L。

The separation of Cr(Ⅵ) from drinking water by anion-exchange membrane was investigated without supplying electrical potential based on Donnan dialysis principle. The results show that the separation efficiency of Cr(Ⅵ) by anion-exchange membrane can achieve 86.4% under the conditions of influent Cr(Ⅵ) of 1.0 mg/L ( 0.0192 mmol/L ), initial pH of the feed solution of 6.95, NaCl concentration of 0.1 mol/L in the counterion solution, flow rate of the feed and counterion solution of 2.5 mL/min, stirring speed of 500 r/min, and phase temperature of 25℃. Using Na2SO4 solution as the counterion solution, the separation efficiency of Cr(Ⅵ) reduces. Adjusting initial pH of the feed solution to 11.0, the separation efficiency of Cr(Ⅵ) by anion-exchange membrane decreases to 78.9%. Increasing stirring speed of the two solutions beside the membrane, Cr(Ⅵ) in the feed chamber is more easily transferred to the receiver chamber through anion-exchange membrane. When phase temperature increases from 10℃ to 40℃, the residual Cr(Ⅵ) concentration in the feed chamber decreases from 0.21 mg/L to 0.12 mg/L.

陈世洋（1984—），男，江苏泰州市人，博士生，从事水质净化与水污染控制研究。* 通讯联系人

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