ELECTRODEIONIZATION APPARATUS AND METHOD

摘要

An electrodeionization apparatus and method for purifying a fluid. A fluid, such as water, can be purified by removing weakly ionizable species from the fluid. Weakly ionizable species may be dissociated at different pH levels to facilitate removal from the fluid in an electrodeionization device. The electrodeionization apparatus comprising: a first layer of ion exhange material comprising cation exchange material and/or anion exchange material; and a second layer of ion exchange material comprsing anion exchange materia l in fluid communication with the first layer; wherein at least one of the layers includes a dopant and/or the apparatus includes a third layer comprising anion and/or cation exchange material in fluid communication with the second layer.