Structure of the Regenerator for in Vitro Electroregeneration of Compound Bed Resin

Based on practical experience in developing electro-regeneration of ion exchange resins, the authors of this paper promptly applied for a utility model patent for a "Multi-bed Ion Exchange Resin Electro-regeneration Device," supplementing the invention patent for "Ion Exchange Resin Electro-regeneration Method and Device." This utility model patent, in addition to proposing a bipolar membrane to divide the original mixed-bed resin electro-regeneration chamber into two—one for the cation exchange resin and one for the anion exchange resin in a multi-bed system—also proposes filling the concentrate chamber with conductive resin using an equal-void method. This reduces the resistance of the concentrate chamber, improves current efficiency, and eliminates the need for cumbersome concentrate circulation or salting.

Under the action of a DC electric field, utilizing the water ionization property of a bipolar membrane, inserting the bipolar membrane into the middle of the original mixed-bed resin electroregeneration chamber divides the chamber into a cation-bed resin electroregeneration chamber and an anion-bed resin electroregeneration chamber, enabling the electroregeneration of mixed-bed resin. Experiments show that the resin regeneration degree obtained by the electroregenerator for spent mixed-bed resin is comparable to that of acid-base chemical regeneration; operation does not consume acid-base chemical reagents, there is no waste discharge, and it does not pollute water bodies or the environment; it consumes only a small amount of electricity and pure water, resulting in low energy consumption and excellent economic benefits; operation is simple and convenient. The electro-regeneration technology of multi-bed resin needs to undergo engineering trials in order to be put into practice and industrialized as soon as possible.