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Measuring pH properly in pure and ultrapure water is difficult. pH is critical for process control and for preventing corrosion for example. pH of Ultrapure Water pH of Ultrapure water is 7.00. The only ions present are H+ and OH-, and since these must be in balance, the pH is 7. Don’t try to measure … Read more
Simplified, Value-Priced EDI A Complementary Technology to Portable Exchange DI (PEDI) EDI for Dealers is now a reality. Ultrapure water is a concern for water treatment companies who service critical applications such as Laboratory and Pharmaceutical. You must apply the right technology for your customers’ needs, while remaining competitive and realizing a reasonable profit. EDI … Read more
EDI, Why FCE is Important for Electrodeionization System Performance FCE is Important for EDI System Performance. Electrodeionization systems depend on conductivity, CO2, and Silica; all brought together by using FCE, or Feedwater Conductivity Equivalent. For an electrodeionization system to operate properly, the feed water must be high-quality Reverse Osmosis (RO) permeate. An RO permeate water … Read more
Electrodeionization (EDI) history extends back to the mid-1970’s in the USA. Possibly back to Argonne National Labs in the 1950’s as a scientific novelty. However, the first working EDI modules were made by Harry O’Hare in 1977 and 1978, and were tested by the Southern Research Institute (SRI). The concept was “filled-cell ED”, an attempt … Read more
In electrodeionization, DC voltage is the force for driving ions out of the stream to be purified. Current is a result of the movement of ions. Both as a matter of physics and as a practical matter, SnowPure recommends using “Voltage Control” for EDI: set the DC voltage potential to the EDI system and walk … Read more
Unlike mixed bed DI, electrodeionization (EDI) is continuous. Because electrodeionization is continuous there are no spikes in quality as when mixed beds are changed for batch regeneration. An additional benefit for EDI users is that there is no concern about the timing of changing batches, or planning for the eventual breakthrough of ions in the … Read more
What are the advantages and disadvantages of single pass and double pass RO as pretreatment for EDI? Electrodeionization must be pretreated with RO for numerous reasons. Many Electrodeionization (EDI) systems using Electropure™ EDI perform very well with 1-pass RO. It’s easy to achieve 17+ Megohm with 1-pass RO. Most USP WFI and Purified Water systems … Read more
Hot water sanitization of EDI is important for Ultrapure Pharmaceutical Water. Even small numbers of bacteria are a problem for critical water systems like pharmaceutical USP water, dialysis water, and ultrapure water for semiconductor manufacturing. Bacteria are often killed with UV-254, chemicals, and heat. Chemical sanitization is often undesirable or prohibited, creating a steady change-over to pure water systems … Read more
Silica is important in high purity water for power plants. Electrodeionization makes low silica water continuously if you do it correctly. Power plants use high purity water to drive steam turbines. Cogeneration and combined-cycle power plants are highly-efficient, using both exhaust turbines and high-pressure steam turbines. The steam must be of the highest purity. In … Read more