MFEDI工艺参数影响及再生机理研究

发布时间：2018-04-30 08:34

本文选题：MFEDI + 离子交换树脂　；参考：《浙江大学》2015年硕士论文

【摘要】：无膜电去离子(MFEDI)是一项从EDI中发展而来的新型绿色脱盐技术,其创新性地实现了树脂的无膜电再生。MFEDI采取处理与电再生交替运行方式实现水的绿色净化。处理时,以离子交换柱中填充的树脂实现水的脱盐；电再生时,以强电场促进离子交换平衡向再生反应方向移动,同时,用高纯水将解吸的盐离子带走。本论文研究了MFEDI制备高纯水的工艺参数及其电再生机理,主要工作包括三部分：树脂层参数影响、再生参数影响、MFEDI电再生机理。研究结果表明：弱酸-强碱混合树脂(D113-550A)决定着MFEDI整体性能。通过研究D113-550A的配比和层高对MFEDI性能的影响,确定了D113-550A的最优配比为1：2,最优层高为30cm。通过研究不同再生参数对MFEDI再生性能的影响,确定了最优再生参数为：再生时长20min,再生流速25m/h,再生电流密度100A/m2。在最优工艺参数下,MFEDI的能耗和水回收率分别为0.594 kWh/m3水和82.4%。不同树脂组合的电再生实验表明,阳离子几乎不通过D113树脂逆向电迁移；阴离子主要在550A树脂相内电迁移,550A的离子型式决定了混合树脂的导电能力；水解离主要发生在D113和550A树脂的接触面上,并为D113和550A的再生提供了82.4%以上的H+和OH-。
[Abstract]:MF-EDI is a new type of green desalting technology developed from EDI. It innovatively realizes the green purification of water by alternate operation of membrane free electroregeneration and electroregeneration. When treated, the desalination of water was realized by the resin filled in the ion exchange column, and the ion exchange equilibrium was moved to the regenerative reaction direction by a strong electric field during the electric regeneration, and the desorbed salt ions were taken away with the high purity water. In this paper, the process parameters and electroregeneration mechanism of high purity water prepared by MFEDI were studied. The main work includes three parts: the influence of resin layer parameters and regeneration parameters on the electroregeneration mechanism of MFEDI. The results show that D113-550A) determines the overall properties of MFEDI. By studying the effect of the ratio of D113-550A and layer height on the properties of MFEDI, the optimum ratio of D113-550A is 1: 2 and the optimum height of layer is 30 cm. By studying the effect of different regeneration parameters on the regeneration performance of MFEDI, the optimal regeneration parameters are determined as follows: regeneration time 20 min, regeneration velocity 25 m / h, regeneration current density 100 A / m 2. The energy consumption and water recovery were 0.594 kWh/m3 and 82.4 kWh/m3, respectively. The electroregeneration experiments of different resin combinations showed that the cation hardly passed through D113 resin reverse electromigration, and the ionic type of anion mainly in 550A resin phase determined the conductivity of the mixed resin. The hydrolytic dissociation mainly occurred on the contact surfaces of D113 and 550A resins and provided more than 82.4% H and OH-OH for the regeneration of D113 and 550A.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ123.5

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