Capacitive deionization (CDI) process is conceptually similar to that of a super-capacitor and cleans water through the application of a programmable electrostatic potential which removes charged species (salts, heavy metals, microbes, VOC’s) and some organic pollutants. A typical CDI cleaning process comprises of a deionization cycle followed by an electrode recuperation protocol as described below.
When water comes in contact with the charged CDI electrodes, the positively charged species are attracted to the negative electrode, while the negatively charged species are attracted to the positive electrode. Hence water exiting the device has a lower pollutant content and is obtained without the use of any chemicals or permanent reactions.
Upon saturation of the electrodes, the applied potential is removed to release the electrostatically held pollutants back into a concentrated waste water stream; hence recuperating the electrodes for the next deionization cycle.