EDI Equipment for Pure Water Treatment

EDI Equipment for Pure Water Treatment is mainly under the effect of dc field, move through the water dielectric directional ion happen of partition, the choice of the use of ion exchange membrane was carried out on the water quality purification through role of a scientific water treatment technology.

Product Details

Electrodeionization unit systems EDI Equipment for Pure Water Treatment:


Electric ion Electrodeionization, referred to as EDI, is also called continuous electric desalination technology. It scientifically integrates electrodialysis technology and ion exchange technology into one. It realizes the directional migration of ions in water under the action of an electric field through the selective transmission of cations and anions by cation and anion membranes and the exchange of ions in water by ion exchange resins, thereby achieving deep purification and desalting of water. The filling resin is continuously regenerated by the hydrogen ions and hydroxide ions generated by water electrolysis, so the high-quality ultrapure water can be continuously produced without the regeneration of acid and alkali chemicals in the EDI water production process. It has the advantages of advanced technology, compact structure and easy operation. It can be widely used in the fields of power, electronics, medicine, chemical industry, food and laboratory, and it is a green revolution in water treatment technology. 

Working principle of EDI equipment:

EDI Equipment for Pure Water Treatment is mainly under the effect of dc field, move through the water dielectric directional ion happen of partition, the choice of the use of ion exchange membrane was carried out on the water quality purification through role of a scientific water treatment technology.

Electrodialyzer between a pair of electrodes, usually by Yin membrane, membrane and baffle plate (a, b) groups arranged alternately, constitute a strong room and light room (i.e. cation through Yang membrane, anion through Yin membrane). The light chamber water cationic migrating to the cathode through the membrane, Yang was strong chamber of Yin membrane filtrate;

Anionic migration towards the positive direction of Yin membrane in water, be strong chamber of Yang membrane intercept, such by light chamber on the number of ions in water gradually reduce, become fresh water, and thick the water chamber, due to the ion of Yin and Yang were strong chamber, dielectric ion concentration rising, become thick water, so as to achieve, purification, concentration or the purpose of refined.

Tap water often contains sodium, calcium, magnesium, chlorine, nitrate, silicon and other dissolved salts.

These salts are made up of negative ions (negative ions) and positive ions (positive ions).

Reverse osmosis can remove more than 99 percent of the ions.

Tap water also contains trace metals, dissolved gases (such as CO2) and other weakly ionized compounds (such as silicon and boron) that must be removed from industrial processes.

The exchange reaction is carried out in the pure chemical chamber of the module, where the anion exchange resin is used to exchange the ion (OH) with their hydroxyl ions (OH) to dissolve the shade of the dissolved salt (for example, chloride ion C1).

In turn, cationic exchange resin USES their hydrogen ions (H) to exchange cations (such as Na) in dissolved salts.

A dc field is added between the anode (+) and the cathode (-) on both ends of the module.

The potential causes the ions to be transferred to the resin to move along the surface of the resin and into the thick water chamber through the membrane.

The anode attracts negative ions (such as OH, CI). These ions, through the anionic membrane, enter the thick flow of water and are blocked by the cationic selection membrane, thus remaining in the strong current.

The cathode attracts the cations in the pure water flow (e.g. H, Na).

These ions pass through the cationic selection membrane, and the dense flow of water entering the phase is separated by the anionic membrane, thus remaining in the strong current.

When the water flows through the two parallel Chambers, the ions are removed from the pure water chamber and accumulated in the adjacent thick current, then carried away from the module by the strong current.

The use of ion-exchange resin in pure water and concentrated water is the key to ElectropupreEDI technology and patents.

An important phenomenon occurs in ion-exchange resin in the pure water chamber.

In localized areas of high potential, electrochemical reaction decomposition water produces a large number of H and OH.

The production of local H and OH in the mixed bed ion exchange resin allows the resin and membrane to continue to regenerate without the need to add chemicals.

The EDI membrane reactor is composed of units sandwiched between two electrodes.

There are two different types of rooms in each unit: the salt water chamber and the concentrated water chamber where the impurities are removed.

Fresh water chamber with blending Yang, anion exchange resin filled with these resin lies between two film: only allow cation through a cation exchange membrane and only allow anion through anion exchange membrane.

Resin bed by using dc on opposite sides of the chamber for continuous regeneration, voltage causes the water molecules in the water into H + and OH -, these ions in the water by the corresponding electrode, through the Yang, anion exchange resin on the corresponding membrane in the direction of migration, when the ion exchange membrane into the thick chamber, H + and OH - combine to form water.

The generation and migration of this H + and OH - is the mechanism for the continuous regeneration of resin.

When the impurities such as Na + and CI - ions in water adsorption onto the corresponding ion exchange resin, the impurity ions will occur like common in mixed bed ion exchange reaction, and accordingly the displacement of H + and OH -.

Once the impurity ions in the ion-exchange resin are added to the H + and OH - to the transfer membrane, the ions will continue through the resin until it enters the concentrated water chamber through the exchange membrane.

The impurity ions due to the blocking effect of adjacent compartment exchange membrane are not moved further towards the direction of the corresponding electrode, so the impurity ions have focused on thick water chamber, then can draw off this containing impurity ions thick membrane reactor.

Product description:

Certification: ISO9001,CE, ISO14001, OHSAS18001 etc

Price: Negotiable

Voltage: 380V 50Hz, the voltage can be as local demand

Payment term: Unionpay transfer

Delivery date: Negotiable

Packing: export standard

Market: Middle East/ Africa/Asia/South America/Europe/North America

Warranty: 1 year

MOQ: 1 set

Parts of customers:


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In 2007, wuxi blue sky watertreatment equipment co. LTD.Company was set up, the main products of alkaline water, pure water, purified water, ultrapure water, RO reverse osmosis, EDI points to zero discharge ion equipment, water treatment equipment, difficult wastewater treatment equipment, circulating cooling water treatment equipment.

In 2007, registered BSW trademark, began to cooperate with Beijing al, our products entered the northern market.

In 2008, we began to cooperate with jesby, Germany, and vandervell.

In 2009, it began to move from pure water to wastewater, and began to do zero discharge, circulating cooling water and other processes.

In 2012, skilled in pure water technology, the stability of wastewater treatment increased.

Cooperate with well-known foreign enterprises.

In 2015, we opened up international market and started working with regional companies such as Africa and Taiwan.

In 2016, zero-emission and circulating cooling water treatment process is well mastered, and products are sold to Fiji and other countries.

In 2017, we will further open up the international market to provide high-quality services and provide high-quality services to make the blue sky flow to every corner of the earth.


1.What's the delivery time for your machine?

Generally speaking, the delivery time of our machines is about 30 days, and the customized machines will negotiate with our customers.

2.Can you tell me which payments you can accept?

Up to now, the payment of 30% of the deposit before shipment, 30% of the deposit is paid by wire transfer, payment by l/c.

3.Is your price competitive?

Only the quality machines we provide.We are sure to give you the best factory pricesSuperior products and services.

4..What water quality tests can you offer?

The water quality tests we provide include:

Water quality test

Rapid tester, PH meter/SS and COD determination of acidity, conductivity and turbidity, residual chlorine determination of total chlorine and multi-parameter water quality, determining BOD, spectrophotometric, determination of dissolved oxygen and water hardness, water ions such as customers need other tests.

Welcome to buy the quality and durable at low price from our factory.If you are interested ,Plz leave us message or contact with our sales directly,Your inquiry will be replied in 24 Hrs!

Contact Below:

Company: Wuxi Blue Sky Water Treatment Equipment Co., Ltd.

Attn: Mr.Zhang

Mobile: +86-18915268218

Tel: +86-0510-82360800

Email: zy@openskywx.com

Web: www.blueskywx.com

Add: No 5,rongqiang Road, Wuxi city, Jiangsu Prov, china

remarks:Main Equipments  Packages  Testing Devices  Delivery:

By Express


By Air


By Sea

500kg or more


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