C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/469 (2006.01) B01J 47/08 (2006.01) C02F 1/42 (2006.01)
Patent
CA 2459840
An electrodeionization apparatus capable of removing silica and boron highly effectively. In particular, an electrodeionization apparatus comprising an anode compartment (17) having an anode (11), a cathode compartment (18) having a cathode (12) and concentrating compartments (15) and desalting compartments (16) which are alternately disposed by alternately arranging multiple anion exchange membranes (13) and cation exchange membranes (14) between the anode compartment (17) and the cathode compartment (18), wherein the desalting compartments (16) and the concentrating compartments (15) are each filled with an ion exchange body. The ratio (volume ratio) of anion exchange body/cation exchange body is in the range of 8/2 to 5/5. Deionized water is taken out by passing respective electrolytic water through the anode compartments (17) and the cathode compartments (18), passing concentrated water through the concentrating compartments (15) and passing raw water through the desalting compartments (16). Water whose silica or boron concentration is lower than that of raw water is passed through the concentrating compartments (16) as the concentrated water in the direction from the deionized water takeout side toward the raw water inflow side of the desalting compartments (16). At least portion of the concentrated water flowing out from the concentrating compartments (15) is discharged outside the system.
L'invention concerne un appareil d'électrodésionisation permettant d'éliminer de manière hautement efficace la silice et le bore. L'invention concerne, en particulier, un appareil d'électrodésionisation comprenant un compartiment (17) d'anode contenant une anode (119, un compartiment (18) de cathode contenant une cathode (12) et des compartiments (15) de concentration et des compartiments (16) de déssalement disposés en alternance par diaposition alternée de multiples membranes (13) d'échange anionique et des membranes (14) d'échange cationique entre le compartiment (17) d'anode et le compartiment (18) de cathode, les compartiments (16) de déssalement et les compartiments (15) de concentration étant tous remplis d'un corps d'échange ionique. Le rapport (rapport volumique) du corps d'échange anionique et du corps d'échange cationique se situe dans la gamme de 8/2 à 5/5. L'eau désionisée est extraite par passage de l'eau électrolytique dans les compartiments (17) d'anode et les compartiments (18) de cathode, par passage de l'eau concentrée dans les compartiments (15) de concentration, et par passage de l'eau non traitée dans les compartiments (16) de déssalement. L'eau dont la concentration de silice ou de bore est inférieure à celle de l'eau non traitée passe dans les compartiments (15) de concentration, et l'eau concentrée dans la direction allant du côté d'extraction de l'eau désionisée vers le côté de déversement de l'eau non traitée des compartiments (16) de déssalement. Au moins une partie de l'eau concentrée s'écoulant des compartiments (15) de concentration est évacuée hors du système.
Kurita Water Industries Ltd.
Robic
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