In recent decades, mixed bed ion exchange technology has been the standard process for ultra-pure water preparation. Because periodic regeneration is needed, and large quantity
of chemicals and pure water must be used during the process of regeneration, which will cause environment issues, acid- and alkali-less ultra-pure water system needs to be developed.
Traditional ion exchange technology can no longer meet the demand for modern industry and environment protection. Therefore, the EDI technology combining membrane, resin and
electrochemistry principles becomes a revolution in water treatment technology. It uses electricity instead of acid or alkali for regeneration of ion exchange resin, thus meeting
the demand for modern environment protection.
Since industrialization of EDI membrane deposit technology in 1986, several thousand sets of EDI systems have been installed in the world The technology has been vigorous developed
in pharmaceutical, semi-conductor, electric power and surface cleaning industry, etc., and widely adopted in waste water treatment, beverage and micro-organism sectors.
EDI device is applied after reverse osmosis system to replace traditional mixing ion exchange technology. EDI technology has following advantages.