聚合物辅助超滤技术处理含铈废水
作者:潘玲,陆晓峰,陈利芳,申利国,秦强,刘忠英,王帅
单位: 中国科学院上海应用物理研究所,上海201800
关键词: 聚乙烯亚胺(PEI);络合;超滤;放射性废水;铈
分类号:
出版年,卷(期):页码: 2014,34(6):67-71

摘要:
使用聚乙烯亚胺(PEI)辅助超滤法处理放射性废水中的铈(Ce)。着重研究了pH,聚合物/金属离子质量比(P/M),离子浓度以及操作压力、运行时间对铈离子(Ce3+)截留率和膜渗透通量的影响。研究结果显示:使用聚合物PEI辅助超滤时,最佳实验条件为pH=5,P/M=15;在最适pH和P/M比值下,三种截留分子量超滤膜对Ce3+截留率分别为88.23%(5kDa)、87.01%(10kDa)和89.78%(30kDa);当溶液中存在Na+和Ca2+时,膜对Ce3+的截留率将会降低。膜通量随着操作压力的增加呈线性增加;三种膜通量均随着运行时间的增加有减小的趋势,且下降率顺序为30kDa >10kDa> 5kDa。
Polyethyleneimine(PEI) was used to assist ultrafiltration to remove cerium from radioactive wastewater. The effects of pH, mass ratio of polymer to metal (P/M), ionic concentration, transmembrane pressure and processing time on retention of cerium and membrane permeate fluxeswere investigated. The results showthat when using PEI assist ultrafiltration,the optimum pH value and P/M value are 5 and 15, respectively; at the optimum conditions, the retentions of three different molecular weight cut-off (MWCO)membranesare 88.23% (5kDa), 87.01% (10kDa) and 89.78% (30kDa), respectively; in addition, the retention of cerium will decrease when Na+ and Ca2+ are exist in solution.The membranepermeate flux is linear increase with the increase of transmembrane pressure;Three kinds of membrane permeate flux have a tendency to decrease with the increase of operation time,and the rank of three membranespermeate flux decrease rate is: 30kDa >10kDa> 5kDa.

基金项目:
上海市科技攻关项目(08231200300)

作者简介:
潘玲(1988-),女,安徽滁州人,硕士研究生,研究方向为超滤技术在放射性废水中的应用,E-mail:panling@sinap.ac.cn.

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