Overview
The two-stage RO + EDI + DI system is a multi-stage water purification solution designed to produce ultrapure water for industrial applications. It integrates reverse osmosis (RO) for bulk contaminant removal, electrodeionization (EDI) for continuous ion exchange without chemicals, and deionization (DI) as a polishing step to achieve exceptionally low conductivity levels. This system is favored in industries where water purity is critical, such as semiconductor manufacturing, pharmaceutical production, and high-pressure boiler feed applications. Its modular design allows scalability to meet varying capacity demands while maintaining consistent output quality.
Structure and Working Principle
The system begins with a two-stage RO unit, where the first stage removes ~95–99% of dissolved solids, and the second stage further reduces impurities. Pressurized feed water passes through semi-permeable membranes, separating purified water from concentrated brine. The EDI module then removes residual ions via electrically active membranes and ion-exchange resins, operating continuously without chemical regeneration. Finally, the DI polisher, containing mixed-bed ion-exchange resins, ensures the water meets the strictest purity standards (often < 0.1 µS/cm). The system typically includes pretreatment (e.g., multimedia filters, carbon filters) to protect downstream components.
Key Features
Energy efficiency is a hallmark of this system, as EDI reduces reliance on chemical regenerants compared to traditional DI systems. The two-stage RO configuration enhances recovery rates (typically 70–75%) while minimizing wastewater. Automation features, such as PLC controls and real-time conductivity monitoring, ensure stable operation with minimal manual intervention. The system’s compact footprint and skid-mounted design simplify installation in space-constrained facilities. Additionally, its corrosion-resistant materials (e.g., 316L stainless steel) extend longevity in harsh environments.
Application Areas
Pharmaceutical industries use this system to produce Water for Injection (WFI) and purified water compliant with USP/EP standards. In microelectronics, it supplies ultrapure water for wafer rinsing, where even trace ions can disrupt semiconductor fabrication. Power plants rely on it for high-pressure boiler feed water to prevent scaling and corrosion. Laboratories and biotechnology facilities also employ these systems for reagent preparation and equipment cooling. The system’s adaptability makes it suitable for niche applications like aerospace component cleaning and LED manufacturing.
Maintenance and Precautions
Regular maintenance includes RO membrane cleaning to prevent fouling and scaling, which can reduce flux and salt rejection. EDI stacks require periodic inspection for resin exhaustion and voltage optimization. Pretreatment is critical; chlorine must be removed to protect RO membranes, and feed water hardness should be < 1 ppm to avoid EDI scaling. DI resin beds need regeneration or replacement when effluent quality declines. Automated sanitization cycles (e.g., hot water or chemical flushes) help maintain microbial control in pharmaceutical applications.
B2B Procurement Guide
When procuring this system, specify feed water characteristics (e.g., TDS, silica, CO2) and required output quality (e.g., resistivity, TOC levels). Assess flow rate requirements (gpm or m³/h) to size the system appropriately. Opt for suppliers with industry certifications (e.g., ASME, CE) and validated systems for GMP compliance if needed. Consider lifecycle costs, including energy consumption, consumables (membranes, resins), and wastewater treatment. Request performance guarantees and after-sales support for troubleshooting and spare parts availability.
Related Manufacturers
- 主营：树脂回收、回收废旧树脂、离子交换树脂回收、反渗透膜回收、二手反渗透膜销售、回收旧反渗透膜、EDI模块回收、大孔树脂回收、阴阳树脂回收、混床树脂回收、废旧树脂回收、RO膜回收
- 主营：RO膜反渗透、滤瓶、滤芯
- 主营：反渗透膜、保安过滤器滤芯、折叠滤芯
- 主营：反渗透、保安过滤器、缠绕式滤芯、大流量折叠滤芯
- 主营：缓蚀阻垢剂、杀菌灭藻剂、除垢剂、反渗透阻垢剂、反渗透还原剂、反渗透杀菌剂、反渗透清洗剂、粘泥剥离剂、消泡剂、氨氮去除剂、絮凝剂、除油剂、臭味剂、COD去除剂、除锈剂、工业清洗剂、预膜剂
- 主营：MBR膜、超滤膜、超滤设备、反渗透纯水设备、一体化污水设备、水处理设备
- 主营：水处理设备、利欧泵、玻璃钢罐、反渗透膜、阴阳混床树脂、漂莱特超纯水树脂、超纯水树脂、18兆欧树脂、唯赛勃玻璃钢罐、水处理设备维修、漂莱特超纯水混床树脂、漂莱特阴阳混床树脂、氢氧型树脂、漂莱特氢氧型树脂、漂莱特氢型树脂
- 主营：纯水设备、高纯水设备、超纯水制备、反渗透成套设备、去离子水设备、除盐水设备、软化水处理、纯水设备定制、10吨纯水设备、纯水处理设备
- 主营：工业净水设备、含铬废气处理设备、工业废水处理设备、反渗透净水设备、酸碱废水处理设备、工业废水处理蒸发器、低温蒸发器、纯水净水设备、喷淋塔设备、纯水超滤设备、纯水中水回用设备、高温蒸发器、旋转蒸发器、制药行业用纯水设备
- 主营：混凝土防碳化涂料、混凝土色差修复剂、清水混凝土保护剂、反渗透、有机硅憎水剂、硅烷浸渍剂、沥青路面强化保护剂、混凝土防腐涂料、钢筋阻锈剂、高光乳液
- 主营：纯水设备、软化水设备、水处理滤芯、反渗透膜元件、南开软化树脂、容鑫泰玻璃钢罐、电泳漆超滤膜
- 主营：环氧树脂灌浆料、环氧树脂砂浆、环氧树脂胶泥、反渗透、环氧灌浆砂浆、混凝土色差调整修复剂、聚合物加固修补砂浆、丙乳砂浆、高强无收缩灌浆料、粘钢胶、微膨胀注浆料、高强耐磨料、防碳化涂料、混凝土修补剂、微膨胀水泥、无机注浆料、高延性混凝土、环氧界面剂、混凝土界面剂、混凝土再浇剂
- 主营：净水器、直饮水机、纯水机、RO反渗透设备、RO反渗透净水机、12L反渗透直饮机、反渗透直饮水机、管线机、饮水机、滤芯更换、商用净水器租赁、办公直饮净水器、超滤净水机设备、校园净水器、直饮水设备租赁、净水器租赁、热水胆冰水直饮机、办公室净水器租赁、净水处理设备、商用净水设备、21L大热水胆、恒温直饮水机、商用净水机、车间饮水净化设备、饮水机专业生产设备
- 主营：聚合物修补加固砂浆、水泥基灌浆料、环氧树脂灌浆料、反渗透、道路快速修补料、聚合物防水防腐砂浆、聚丙烯乳液砂浆、环氧树脂胶泥、环氧树脂砂浆、水泥基渗透结晶防水涂料、混凝土防碳化涂料、环氧灌浆树脂胶、裂缝空鼓胶、环氧树脂植筋胶、环氧树脂粘钢胶、环氧树脂碳布胶、环氧树脂界面胶、J302环氧界面剂、J303混凝土起沙处理剂、EC-1高强界面剂、108浓缩建筑胶粉、环氧树脂涂料、水泥基自流平砂浆、碳纤维布
- 主营：干燥柜、储存柜、双门柜、反渗透、洗手池、单门柜、纯水机、压缩机、转运车、清洗系统、纯水设备、二层推车、不锈钢水槽、不锈钢制品、超声波清洗机、婴儿洗浴设备