EDI纯水设备系统，通过结合反渗透技术与电离子交换功能，提供了一种高效、环保的去离子水生产方式。相比传统的混合离子交换技术，EDI纯水设备具有更稳定的出水质量，更便于实现自动化控制，不需要停机进行化学再生，无需额外的化学消耗，对运行成本和占地面积都有显著优势。此外，它还能够有效减少污染物排放。
ED pure water equipment system, combining reverse osmosis technology with ion exchange functionality, offers a high-efficiency and eco-friendly method for producing deionized water. Compared to traditional mixed-bed ion exchange technology, EDI pure water equipment has more stable output quality, easier automation control, no need for periodic chemical regeneration during operation, minimal chemical consumption required, lower operating costs and reduced land use. Furthermore, it effectively minimizes pollutant emissions.
The development history of high-purity water equipment can be divided into three stages: the first stage involves pre-treatment followed by cation-anion beds; the second stage includes pre-treatment followed by reverse osmosis and then anion/cation beds; while the third stage uses pre-treatment followed by reverse osmosis and then an EDI device.
Pure water devices employing reverse osmosis (RO) technology are able to remove 95-98% of ions from the water through membrane separation. However, this is not sufficient to meet industrial production requirements. Therefore subsequent processes must include ion exchange equipment. For years now, mixed-bed ion exchange technology has been considered as standard process in pure water production due to its ability to produce very clean drinking or laboratory-quality distilled or de-ionized water that meets most laboratory's needs but recently it faces challenges such as needing regular regeneration which requires large amounts of chemicals like acid/base and purified water.
As traditional pure-water-making standards using only ion-exchange technologies become increasingly unable to satisfy modern industry's demands on purity level as well environmental protection requirements , combined membrane-resin systems based on Electrodialysis Ion Exchange Technology have emerged as a promising solution in recent decades . The new system utilizes both resin-based cation/anion membranes (electrodeionization) along with selective ion membranes (mixed bed) achieving higher salt removal efficiency than conventional methods . By combining these two techniques with Reverse Osmosis , we achieve ultra-pure grade product at levels between 10-17 MΩ·cm
The working principle of EDI pure Water Equipment Systems:
The raw feedwater enters into the EDI Pure Water System mainly flowing through resin/membrane inside while another portion flows around outside serving as a washing stream removing impurities from both sides.
In this device tree resin selectively removes ions dissolved in the incoming feedwater.
Under electrical fields applied at electrodes inside the cells within this apparatus,
negatively charged ions move towards positive electrodes
positively charged ions move towards negative electrodes
4 Then,
Positively charged ions pass through positively charged membranes
thus leaving them outside.
5 Next,
Negatively charged ions pass through negatively charged membranes
thus leaving them outside too.
6 Finally,
Concentrated salts accumulate on waste side streams exiting outwards
7 And lastly
De-ionized product leaves from within trees' interiors
The input specifications for feeding into these systems are quite strict:
TEA( including CO2 ) <25mg/LasCaCO3 PH 5-9
Hardness <0.1 mg/LasCaCO3 Silicon <0.5mg/L TOTC<0.5 mg/L Residual Chlorine <0.05mg/L Fe,Mn,H2S<>
Input Pressure:30--100PSI
