Industrial & Commercial
Continuous UltraPure
Electrodeionization Systems

Dayton Water Systems EDI design combines two well established technologies—electro dialysis and ion exchange resin deionization. Through this technique, dissolved salts are removed with low energy cost and without a need for chemicals. The result is high- quality water with multi-megohm resistivity which can be produced continuously at substantial flow rates.

The need to satisfy the increasing demand for high purity water can be achieved using electrodeionization (EDI) technology.

EDI process systems replace conventional DI mixed resin beds to produce deionized water. Unlike DI resins, EDI does not require down time for replacing or regenerating resin beds that require chemical usage. Because of this, EDI minimizes water quality upsets, operating, and capital cost.

EDI removes ions from aqueous streams, typically in conjunction with reverse osmosis(RO) and other purification devices. EDI may be run continuously or intermittently to produce ultrapure water up to 18.2 million ohms in resistivity.

Source Water: RO, 4-30um
Pressure : 25 psi – 90 psi
Temperature: 60 ° F - 95 ° F
Hardness: 1ppm (max)
Total Chlorine:0.05 ppm (max)
Silica: 0.5 (max)
Iron:0.01ppm (max)
Organics: 0.5ppm (max)

A Typical (1) XL-500 module operating at 300VDC drawing 2 amps will cost under $1.00 per 8 hours of operation. This assumes that the power supply is 80%  efficient with a local utility rate of $0.12 per  kW hour.

Advantages over Conventional DI :

• EDI does not require chemicals for regeneration
• Continuous process does not require shut down for regeneration
• More compact than typical ion exchange equipment
• Provides water of consistent quality
• Reduction in operating expense
• No hazardous waste stream