阴离子交换膜分离饮用水中Cr(Ⅵ)的研究  

Study on separation of Cr(Ⅵ) from drinking water by anion-exchange membrane

作　　者：陈世洋[1] 施周[1] 李学瑞[1] 邓林[1] 

机构地区：[1]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,长沙410082

出　　处：《膜科学与技术》2014年第1期96-100,共5页Membrane Science and Technology

基　　金：国家自然科学基金(50778065)

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1.0mg/L,pH值为6.95,补偿溶液NaCl浓度为0.1mol/L,原水和补偿溶液进水流量均为2.5mL/min,膜两侧溶液搅拌强度为500r/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)剩余质量浓度由0.21mg/L下降至0.12mg/L.The separation of Cr（ Ⅵ ） from drinking water by anion-exchange membrane was investigated based on Donnan dialysis principle without supplying electrical potential. The results show that the separation efficiency of Cr（VⅥ） by anion-exchange membrane can achieve 86. 4% under the conditions of influent Cr（Ⅵ） of 1.0 mg/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.

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：TU991.2[建筑科学—市政工程]