Abstract: In order to probe into the regeneration mechanisms of membrane-free deionization (MFEDI),various combinations of resins have been used in the research on electrical regeneration. Anionic and cationic electrical migration paths and water dissociation situation in the systems have been analyzed by the determination of parameters during regeneration,such as regeneration voltages,regenerated liquid conductivities,pH,etc. The results show that almost no electrical migration occurs to the cation via weak-acid resins,whereas the anion mainly migrates among strong-base resins. Water dissociation mainly takes place at the interface between weak-acid resins and strong-base resins,which supplies more than 82.4% of H⁺ and OH^- for the regeneration of these two kinds of resins.

Key words: membrane-free deionization, electrical mixed bed, electrical regeneration, electrical migration, water dissociation

摘要： 为探究无膜电去离子（MFEDI）的再生机理，采用不同树脂组合进行电再生研究。通过测定各组树脂的再生电压、再生液电导率、pH等参数，对阴阳离子电迁移路径和系统内水解离情况进行了分析。结果表明，阳离子几乎不通过弱酸树脂进行电迁移；阴离子主要在强碱树脂间迁移；水解离主要发生在弱酸树脂与强碱树脂之间，为2种树脂的再生提供82.4%以上的H⁺和OH^-。

关键词: 无膜电去离子, 电混床, 电再生, 电迁移, 水解离

CLC Number: 

• TQ425.2