Selectable ion concentrations with electrolytic ion exchange

一种离子浓度、阳离子交换的技术，应用在处理含有离子的流入液领域，能够解决不能控制离子浓度等问题
CN1863737BActive Publication Date: 2011-04-27POS TECH INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
POS TECH INC
Publication Date
2011-04-27

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Abstract

An apparatus (20) treats an influent solution (70) comprising ions to obtain a selectable ion concentration in an effluent solution (80). The apparatus (20) comprises an electrochemical cell (22) comprising a housing (25) comprising first and second electrodes (40, 45). A water-splitting ion exchange membrane (100) is between the first and second electrodes (40, 45), the membrane (100)comprising an anion exchange surface (46) facing the first electrode (40), and an cation exchange surface (48) facing the second electrode (45), or vice versa. The housing (25) also has an influent solution inlet (30) and an effluent solution outlet (35) with a solution channel (52) that allows influent solution (70) to flow past both the anion and cation exchange surfaces (46, 48) of the water-splitting ionexchange membrane (100) to form the effluent solution (80). A variable voltage supply (50) is capable of maintaining the first and second electrodes (40, 45) at a plurality of different voltages during an ion exchange stage.
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Description

Background technique

[0001] The practice of the present invention relates to ion exchange methods and apparatus. Ion exchange cells are used to remove or replace dissolved solids or ions in a solution. For example, ion exchange membranes and ion exchange beads are used to deionize water to produce high purity drinking water by removing pollutants and other dissolved solids in municipal wastewater streams. Ion exchange is also used for the selective replacement of ions in industrial wastewater treatment. In another example, tap water is softened by replacing hard divalent ions such as calcium in the tap water with soft monovalent ions such as sodium or potassium. Typically, ion exchange efficiency is measured by determining the total dissolved solids (TDS) content of treated and untreated solutions and expressed as a percent reduction (%R).

[0002] Electrolytically assisted ion exchange increases ion extraction efficiency and facilitates regeneration of ion exchange materia...

Claims

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