摘要
以电镀漂洗水为主要来源的低浓度重金属废水,多为对生态环境危害极大,难以处理的一类污染物,其彻底处理方法是实现电镀工艺的闭路循环与零排放。针对这一研究目标,讨论了通常用于纯水制备的电去离子(EDI)装置内部构造的适应性改进,并利用自制EDI膜堆对低浓度含镍废水处理进行了实验研究。实验条件下,对于Ni2+含量为40mg/L,pH为5。7的原水,EDI淡化水的Ni2+浓度低于0.1mg/L,浓缩水浓度则达到1060mg/L。研究表明,利用EDI技术处理低浓度重金属废水,可同时实现出水纯化和重金属离子的有效浓缩,回收有价金属和纯水资源,实现重金属废水的零排放与资源化。
Dilute heavy metal wastewater mostly from rinsing procedure in electroplating, is one of the chief pollutants to environment difficult for treatment. Closed-circuit circulation and zero emission are effective to pollution control. Configuration alteration of electrodeionization （EDI） process commonly for pure water production was discussed, based on which a novel EDI membrane stack was prepared, and the ability of EDI to recover purified water and nickel from dilute nickel wastewater was evaluated. With the feed concentration of 40mg/L and pH 5.7, EDI was capable of giving a Ni^2＋ rejection more than 99.8% in the dilute stream, the concentration of dilute product was below 0.1mg/L while that of the concentrate could be up to 1,060mg/L. It was indicated that pure water production and concentration of heavy metal ions could be simultaneously accomplished by EDI technology just in one process, valuable heavy metal and water resource could be recovered as well.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2009年第6期132-136,共5页
Environmental Science & Technology
基金
国家高技术研究发展计划(863计划)项目(2007AA06Z330)
天津市科技支撑计划重点项目(09ZCKFSH01800)
高等学校博士学科点专项科研基金新教师项目(20070055081)
天津市应用基础研究计划项目(06YFMJC04800)
关键词
电去离子
电镀漂洗水
低浓度重金属废水
镍
electrodeionization（EDI）
electroplating rinse water
dilute heavy metal wastewater
nickel
