Ultrapure water is also called high-purify water or highly purified water. It has organic particles and dissolved gases removed, and is treated to the highest levels of purity for all contaminant types. It’s usually used in hospital, lab and semiconductor industry.

The EDI (Electrode Ionization Design) combines two well-established water purification technologies: electrodialysis and ion-exchange resin deionization. It’s

one of the revolutionary techniques in water treatment industry. EDI does not require chemicals for regeneration with achievements of high purity water. Invention of EDI makes the greatest progress in water treatment technology and points the way in which water treatment industry can be developed. It’s the symbol that water treatment industry has been stepped into green industry as well.

Advantages over conventional DI:

a) EDI does not require chemicals for generation

b) EDI can run continuously and provide consistent quality water

c) EDI can be conveniently operated and managed with lower labor intensity and operation cost

EDI equipment includes pretreatment system, dosing system, RO system, booster pumps, EDI modules, high voltage DC potentials, flow meters, pipe instruments, etc.

Qualified RO produced water is forced into EDI system by booster pumps. Mixed ion exchange resin will continuously remove the impurities from the water by ion exchange.

Meanwhile, the electrolyte stream flows pass the anode and cathode in series, the applied current also drives a water splitting reaction which produces hydronium ions (protons) and hydroxyl ions. These ions continuously regenerate the ion exchange resin so that it will continue to remove impurities from the feed water. At the same time, re-displaced caption and anion from the feed water will permeate into concentrate chamber and then to outlet by reverse osmosis.

Electro-regeneration makes it possible to produce continuously de-ionized water without shutdown or conventional regeneration equipment. DDWI has long

experience of EDI technical R＆D. According to industrial standard HY/120-2008, HG/H3982-2007, we launch a new style of fully filled EDI which doesn’t need add salt or concentrated water recycle system. Comparing to the technical function of the same product from developed countries, ours is as good as theirs, but ours has more competitive price.