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反渗透/电去离子(RO/EDI)集成膜过程制备高纯水的研究 总被引:10,自引:2,他引:10
以城市自来水为原水,采用超滤/反渗透/电去离子集成膜过程工艺,实现了净化、初级脱盐、深度脱盐-机完成,在酸碱零消耗的前提下连续、稳定、清洁、高效的高纯水生产,产品水电阻率达到15~17MΩ·cm.研究了均相与异相离子交换膜的使用对产品水质量的影响,发现均相膜的使用并未提高过程的去离子效果.研究同时表明,对于弱离子态的硅的去除,EDI更具有传统的电渗析与离子交换所不可替代的特殊优点. 相似文献
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电去离子(EDI)高纯水新技术及其研究进展 总被引:8,自引:0,他引:8
介绍了EDI过程的脱盐机理,分析并提出了过程的主要强化途径。阐述了EDI的V-I、pH-I特征及“树脂电再生”等特征及其与电渗析(ED)过程的区别。介绍了国内外EDI的研究进展与应用概况。 相似文献
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本就上海化工厂新型膜的开发作一概述。给出了3363、3364和3365异相膜的测试数据。目前该厂离子交换膜的年产量已达3.8×10^5m^2。 相似文献
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电去离子过程中工作电压对铜离子去除的影响 总被引:1,自引:0,他引:1
进行了电去离子(EDD过程去除铜离子的研究,着重考察了膜堆电压对去除性能的影响。试验采用一级两段的混床EDI膜堆,以含铜约50mg/L的CuSO4溶液为原水。研究表明,随着膜堆电压增大,电流增加,铜离子的去除率增大,EDI过程的操作逐渐由“增强传质”模式过渡为“电再生”模式,并且膜堆电压越高,发生电再生的树脂层高度越大,EDI产水中铜离子浓度用火焰原子吸收分光光度法无法检出,电导率则可达到1μS/cm以下。对于一定的分离目标,存在一个适宜的操作电压范围,能够既满足分离要求又避免过高的能耗。 相似文献
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反渗透-电去离子脱盐系统 总被引:11,自引:2,他引:11
介绍了反渗透-电去离子(RO-EDI)脱盐系统的特点和应用,RO-EDI脱盐系统具有出水质量高,连续生产,使用方便,无人值守,不用酸碱,不污染环境,占地面积小,运行经济等一系列优点,重点说明制备国产EDI设备中所用的材料(离子交换膜和离子交换剂)及寺充物填充方式等有关问题。指出推广RO-EDI脱盐系统的当务之急是制备国产设备,等空隙填充法为制备EDI设备提供了一种良好的填充方式。 相似文献
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采用电渗析技术对焦化生化出水如曝气生物滤池出水及反渗透浓水进行脱盐,考察不同废水中的离子迁移、废水脱盐及离子交换膜污染情况。结果表明:2种焦化废水采用电渗析处理具有较好的脱盐效果,其中不同离子的迁移脱除与其浓度、离子半径等密切相关。膜电阻测试表明,不同焦化废水电渗析体系中不同离子交换膜的污染存在差别。扫描电镜和红外分析表明,曝气生物滤池出水主要由有机物造成阴离子交换膜污染,而反渗透浓水主要在电渗析浓室侧的膜表面形成颗粒状的无机污染,且阳膜浓室侧比阴膜浓室侧更显著。 相似文献
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回收重金属废水用电去离子技术研究进展 总被引:1,自引:1,他引:0
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. 相似文献
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电去离子软水技术的原理与应用前景 总被引:1,自引:1,他引:1
发明了电去离子(EDI)软水技术。EDI软水装置具有:连续产水;深度除硬;无人值守;不用再生药剂的特点。EDI软水装置将作为更新换代的制备软化水的高新技术产品,在制备工业锅炉补给水、冷却水、其它工业用水等领域内得到推广使用。 相似文献
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Successive concentration and purification of simulated nickel-electroplating rinsing wastewater was carried out by integrating membrane process with electrodeionization. The concentrate compartments were filled with ion exchange resins to enhance the separation. The concentrate stream of the primary EDI procedure was operated in closed circuit circulation. The influence of the volumetric ratio of resins in concentrate compartments on the separation was examined. It was found that the best performance could be achieved when anion to cation resin ratio of 6∶4 was adopted. With feed Ni2+ concentration of 50 mg·L-1 and pH of 4.25,the Ni2+ concentration of effluent dilute stream could reach 2.78 mg·L-1 while that of the effluent concentrate stream was as high as 11171 mg·L-1,which gave a concentration ratio of higher than 220. The effluent dilute stream of the primary EDI was then sent to the second EDI stack for deep desalting. Dilute product with resistivity of 1.6—2.0 MΩ·cm was then obtained,which could be recovered as pure water for electroplating. The membrane process integrated with EDI could find its potent role for zero emission and resource reuse of heavy metal wastewater. 相似文献
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The concentration profile in a laminar flow of the diluent of a parallel-plate electrodialysis stack is derived by assuming operation at the limiting current density. The Nusselt mass transfer number is found to depend on the Reynolds number, the Schmidt number and the dimensionless hydraulic equivalent diameter according to (Nu)theo. = 3.7 · (Re · Sc · de/L)1/3. An empirical correlation of the Reynolds number, the Schmidt number, and the shape factor of the electrodialysis cell, with the ionic mass transfer rate in ion exchange membrane electrodialysis is obtained by measuring the limiting current densities at various conditions. The resulting empirical mass-transfer correlation, (Nu)exp. = 3.91 · Re0.333 · Sc0.328 · (de/L)0.352, holds for sodium acetate as dialysate at concentrations ranging from 0.0106 to 0.0508 kmol/m3, viscosities ranging from 0.608 to 0.926 mPa · s, temperatures ranging from 15 to 55°C, axial velocities ranging from 0.341 to 4.55 cm/s, and for cell thicknesses of 0.32 and 0.94 cm, and is found to be in agreement with the equation obtained from theory. The effects of concentration, flow rate and temperature on the limiting current density are also studied. The relationship between the thicknesses of the diffusion layer and the Reynolds number has been analyzed. 相似文献