Separating device and water treatment equipment thereof
A treatment unit and waterway technology, applied in the field of water treatment, can solve the problems of attenuation of the performance of the pre-stage membrane stack, affecting the overall performance of the multi-stage electrodeionization device, affecting the quality of the incoming water and the service life of the rear-stage membrane stack, etc.
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Embodiment 1
[0059] A multi-stage electrodeionization device, such as figure 1 As shown, according to the liquid flow direction of desalination, N processing units are arranged in series in series, and N is a natural number greater than 1. The number of N can be set and selected according to needs, for example, it can be set to 2 to 100, and can also be set to other required numbers.
[0060] For any processing unit, the waterway connected in series in front of the processing unit (also known as the front-stage waterway) is the pre-stage processing unit of the processing unit, and the waterway connected in series behind the processing unit (also known as the rear-stage waterway) is all It is the subsequent processing unit of this processing unit.
[0061] Each processing unit includes a pair of electrodes and at least one bipolar membrane between the two electrodes that constitute the electrode pair, and the total amount of ion-exchange groups of the same type in all bipolar membranes in ...
Embodiment 2
[0075] A multi-stage electrodeionization device, according to the flow direction of desalination, a plurality of treatment units are arranged in sequence, each treatment unit contains the same number of bipolar membranes, and the cation exchange membranes of each bipolar membrane face the same polarity the electrodes.
[0076] According to the liquid flow direction of desalination, the effective value of each previous pre-processing unit is greater than the effective value of the subsequent post-processing unit adjacent to it.
[0077] In the multi-stage electrodeionization device, along the desalination direction, the total amount of salt processed by each treatment unit gradually decreases. In the multi-stage electrodeionization device, the effective value of the treatment unit makes the water production capacity of the front treatment unit larger. It greatly improves the water quality and service life of the post-processing unit, solves the problem that the performance of ...
Embodiment 3
[0080] A multi-stage electrodeionization device, other features are the same as embodiment 1 or 2, the difference is: the total amount of cation exchange groups per square centimeter of cation exchange membrane of at least one bipolar membrane in at least one treatment unit Greater than or equal to the total amount of anion exchange groups per square centimeter of anion exchange membrane. Typically, the total amount of cation exchange groups per square centimeter of cation exchange membrane in the cation exchange membrane of a conventional bipolar membrane is equal to the total amount of anion exchange groups per square centimeter of anion exchange membrane in order to maintain balance.
[0081] However, the present application adopts the bipolar membrane with the total amount of cation exchange groups per square centimeter of cation exchange membrane greater than the total amount of anion exchange groups per square centimeter of anion exchange membrane as part of the bipolar m...
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