Historical development of ultra-pure water production

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This post was last edited by hesonchang214 on 2019-9-22 at 10:40. Phase 1: Pretreatment —> Anion exchange resin bed —> Cation exchange resin bed —> Mixed-bed resin bed. Phase 2: Pretreatment —> Reverse osmosis —> Mixed-bed resin bed. Current phase: Pretreatment —> Reverse osmosis —> EDI (no need for acids or bases). Traditional ion exchange methods are increasingly unable to meet the needs of modern industry and environmental protection; therefore, EDI technology, which combines membrane technology, resin technology, and electrochemical principles, has become a revolution in water treatment technologies. The regeneration of its ion exchange resin uses electricity instead of acids and bases, thus meeting the environmental protection requirements of today’s world more effectively. 　　Since the industrialization of EDI membrane stack technology in 1986, thousands of EDI systems have been installed worldwide. It has seen significant development especially in industries such as pharmaceuticals, semiconductors, power generation, and surface cleaning, and is also widely used in areas such as wastewater treatment, beverages, and microbiology. The EDI unit is used after the reverse osmosis system to replace the traditional mixed-bed ion exchange technology (MB-DI) in producing stable deionized water.