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
分类号: X505
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.

基金项目:
国家自然科学基金(50778065)

作者简介:
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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