Continuous Electrodeionization SystemThe performance of CEDI at the various sites has been excellent.
CEDI continues to produce consistently high purity water over time.
Additionally,
the rejection performance of conductivity and specific ions is exceptionally high,
predictable and stable over time.
The CEDI units are also able to consistently and predictably remove weakly ionized species such as
carbon dioxide and silica.
This ability to consistently and predictably remove dissolved ionic species as well as weakly ionized species,
without the need for chemical addition into the feed stream, sets CEDI apart from other large scale
commercial membrane processes.
The water quality that is produced by CEDI, especially in combination with RO, is exceptional.
The level of purity achieved is generally at or near the standard definition of high purity water.
When CEDI is compared to conventional ion-exchange systems, the advantages are very strong:
CEDI obviates the need for on-site storage, use and ultimate disposal of large quantities of acid and caustic
regenerating chemicals, eliminating associated safety, regulatory and environmental concerns;
CEDI by operating in a continuous mode is inherently more stable and less prone
to upsets caused by batch operations.
