ASTM International

Standard Test Method for Operating Performance of Continuous Electrodeionization Systems on Feeds from 50–1000 ?S/cm
 N D6529

Annotation

This test method covers the determination of the operating characteristics of continuous electrodeionization (CEDI) devices using synthetic feed solutions and is not necessarily applicable to natural waters. This test method is a procedure applicable to solutions with a conductivity range from approximately 50 to 1000 S/cm.

This test method covers the determination of operating characteristics under standard test conditions of CEDI devices where the electrically active transfer media therein is predominantly unregenerated. This results in more rapid achievement of steady state and shorter test time than when performing a test which requires the active media be predominantly regenerated.

This test method is not necessarily indicative of the following:

Long-term performance on feed waters containing foulants or sparingly soluble solutes, or both,

Performance on feeds of brackish water, sea water, or other high-salinity feeds,

Performance on synthetic industrial feed solutions, pharmaceuticals, or process solutions of foods and beverages, or,

Performance on feed waters less than 50 S/cm, particularly performance relating to organic solutes, colloidal or particulate matter, or biological or microbial matter.

This test method, subject to the limitations previously described, can be applied as either an aid to predict expected deionization performance for a given feed water quality, or as a test method to determine whether performance of a given device has changed over some period of time. It is ultimately, however, the user's responsibility to ensure the validity of this test method for their specific applications.