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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 easily meet … Read more
Hot water sanitization is a critical requirement for ultrapure water systems used in pharmaceutical USP water
Silica is critical in high-purity boiler water for power plants to prevent efficiency losses and maintenance issues.
High silica feedwaters pose two challenges for ultrapure water membrane systems. On the front end, silica can scale the RO membranes, limiting use of some feedwaters and high water recovery. On the back end, silica can scale the IX resins in the electrodeionization (EDI). It is also a challenge to attain the very low ppb … Read more