Patent ID: 8628653
Filing Date: 2014-01-14
Classification: B01D,C02F,Y02A

Abstract:
1. An electrodeionization apparatus having a cathode and an anode, and having alternately formed therebetween concentrating chambers and desalination chambers by alternately arranging a plurality of anion exchange membranes and cation exchange membranes, each of said concentrating chambers being provided with a bipolar membrane to partition an interior of the concentrating chamber into a cathode side and an anode side, wherein each of said desalination chambers is divided into at least three layers, including a first layer, a second layer and a third layer, from an upstream side in a direction of flow of water to be treated, and each of the at least three layers is filled with an ion exchanger mixture comprising an anion exchanger and a cation exchanger, the ion exchanger mixture filling said first layer and third layer comprises no less than 50 vol % of said cation exchanger, and the ion exchanger mixture filling said second layer comprises from over 50 vol % to 80 vol % of said anion exchanger.