回收重金属废水用电去离子技术研究进展

Progress in the research on electrodeionization used for recovery wastewater containing heavy metals

电去离子(EDI)技术是由电渗析和离子交换相互有机结合的膜分离脱盐技术。其具有连续运行、不用酸碱、环境友好等显著优点。作者介绍了国内外采用电去离子技术回收含铜和含镍废水的研究进展,针对重金属废水的特点,设计了以阳树脂为主的阴、阳树脂分层填充的电去离子装置,采用该技术代替传统的离子交换技术,可实现重金属废水的回收和利用,达到闭路循环、零排放、无污染的目的。

The electrodeionization （EDI） used for recovering wastewater containing heavy metals is a kind of membrane separation-desalination technology, which organically combines the electrodialysis membrane technology and the ion exchange technology together. The membrane technology has the following distinguished advantages： continuously running, without using acid-alkali and friendly to environment etc. The technologies used for recovering wastewaters containing copper or nickel are introduced. Based upon characteristics of the wastewater containing heavy metals, an EDI equipment, filled up with layers of cation resin （main part） and anion resin, has been designed. By using this technology, replacing the traditional ion exchange one, the recovery and use of wastewater containing heavy metals, with closed recycling , zero draining and no pollution, can be successfully realized.