(I)Product Overview
EDI (Electrodeionization) ultrapure water equipment is a continuous deep desalination water production device without acid-base regeneration. It integrates ion exchange resin and electrodialysis electrochemical principles to deeply purify reverse osmosis produced water. It is the core terminal equipment for industrial high-end ultrapure water preparation.
This device accepts RO produced water as the inlet, and uses electric field driving force to achieve directional migration of cations and anions in the water for removal. The resin is synchronously regenerated online, and stable output of ultrapure water with a resistivity of 15M Ω· cm or more is achieved. It is widely used in electronic semiconductors, lithium batteries, photovoltaics, laboratories, pharmaceuticals, medical equipment, precision electroplating, and other working conditions with high control standards for water resistivity, total organic carbon, and silicon content. It can replace traditional mixed beds and achieve environmentally friendly continuous automated water production.
(II)Core product features
1. No acid and alkali regeneration, environmental cost reduction. Cancel the traditional mixed bed acid and alkali agent regeneration process, no acid and alkali waste liquid discharge, save the cost of agent procurement, storage, and waste liquid neutralization treatment, and reduce the safety risks caused by chemical operations.
2. Continuous water production with low water quality fluctuations can be achieved by powering on. There is no sudden change in water quality during the start stop process, and the effluent resistivity remains stable at 10-18.2 M Ω· cm. It has good removal effects on trace ions such as silicon, heavy metals, and nitrates.
3. High level of automation, easy maintenance configuration, online monitoring of resistivity, flow rate, pressure, and conductivity of concentrated water, automatic control of concentrated water reflux and production water flow rate; Resin electric field in-situ regeneration, without the need for manual disassembly and replacement of resin.
4. Low energy consumption, high water efficiency, modular footprint, excellent lifespan, modular EDI membrane stack, supporting single or multiple parallel expansion of processing capacity; The module has low operating voltage and low energy consumption; Concentrated water can be supplied back to the RO inlet, with an overall water recovery rate of 85% and 95%, and water consumption is much lower than that of traditional mixed beds. The design life of the membrane stack is 23 years, and the pipeline and automatic control system are corrosion-resistant with long maintenance intervals.
5. The low silicon and low TOC deep removal of soluble silicates and organic ions in the effluent meets the high-level water requirements of photovoltaics, semiconductors, lithium batteries, etc., and prevents scale and silicon scale from blocking downstream precision equipment.
6. The medium contact parts of the anti-corrosion and explosion-proof safety design are made of UPVC, PVDF, 316L stainless steel, with electrode insulation treatment to eliminate potential leakage hazards, suitable for clean and explosion-proof workshop scenarios.
(III)Complete system composition
The EDI ultra pure water system consists of four modules: pre-treatment, EDI host, automatic monitoring, and auxiliary circulation recovery.
1. Pre treatment unit (inlet guarantee) first/second stage reverse osmosis removes the vast majority of salt and colloidal suspended solids; 5 μ m/1 μ m security filter protects EDI membrane stack; Activated carbon/TOC device reduces organic matter; Adjust the pH to 7.0 and 9.0 to enhance the desilication effect; The booster stabilizing pump stabilizes the inlet pressure and flow rate.
2. The core unit of the EDI host (water production core) is the EDI membrane stack, which is divided into a fresh water chamber, a concentrated water chamber, and an extreme water chamber; 0 300V adjustable DC power supply provides electric field power; PVDF corrosion-resistant three-way pipeline; Speed up the concentrated water circulation pump to prevent scaling.
3. Online monitoring and automatic control unit resistivity, conductivity, pressure, and flow rate collection; PLC+touch screen realizes automatic operation, interlocking protection, and fault recording; The water quality exceeds the standard and automatically flows back to the original water tank to prevent unqualified water supply.
4. Assist in recycling the nitrogen sealed sterile ultrapure water tank of the water storage unit; Concentrated water reflux RO raw water tank recovery; Optional UV and ultra purification column deep treatment; The circulating pump maintains the water quality of the pipeline to avoid retention and attenuation.
