Process and apparatus for treating water by magneto-electric dialysis

Abstract

A magneto-electric dialysis process for desalinating seawater, preparing salt from seawater and desalting industrial water is characterized by that on the basis is existing electric dialysis equipment, a static magnetic field is additionally used to directionally shift the cations and anions in flowing solution. Its apparatus is composed of a casing with different water inlets and outlets and electrodes, a group of cationic exchange membranes and anionic exchange membranes, which are alternatively arranged between anode and cathode, and a permanent magnet attached to each wall of the casing. Its advantages are high throughput, less electric consumption and not scaling.

Description

technical field [0001] The invention relates to a device for treating water by electrochemical method. In particular, a permanent magnetic plate is added to the existing electrodialyzer to enhance the directional deviation of charged particles in the solution and the equipment for magnetic treatment and descaling of water. It can be widely used in seawater desalination, brackish water desalination, seawater concentration salt production, industrial water desalination, etc. Background technique [0002] The existing water treatment equipment is an electrodialyzer, which is based on the electrodialysis method, that is, the selective permeability of the ion exchange membrane is used in a direct current electric field to make the positive and negative ions in the water or solution flow to the anion exchange membrane and cation exchange respectively. The membrane is used for directional migration, and its structure can be obtained from Figure 1 ~ Figure 3 As seen in the figure,...

AI Technical Summary

Problems solved by technology

After the above process has been carried out for a period of time, due to scaling and electrode polarization on the ion exchange membrane and the two electrodes, the speed of seawater desalination gradually slows down, the quality of the effluent water decreases, and the power consumption increases.

The disadvantages of existing electroosmotic devices are: 1) the positive and negative ion migration speed depends on the structure, material and current density of the electrodialyzer, the properties of the water to be treated, etc. Once the equipment has been made and installed, all the above parameters will become stable. Therefore, the water treatment speed and treatment quality can no longer be improved, the current efficiency can no longer be improved, and the power consumption cannot be reduced; 2) The scale and electrode polarization that appear on the anion and cation exchange membranes and the two electrodes will The electrodialysis performance and service life of the membrane and electrode are reduced, so it must be washed in time, and in serious cases, it must be disassembled and washed, thereby reducing the water treatment capacity, and this operation is troublesome and time-consuming; method, although it can partially solve the problems of fouling and polarization, but every time the electrode is reversed, the production must be stopped, which affects the productivity

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