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 method and equipment for electrochemically treating water, in particular to a method and equipment for using the charged particles moving in the solution to be deflected by the action of Lorent's magnetic force, and the descaling effect of the magnetic treatment of water. Methods and equipment for improving membrane separation technology. It can be widely used in seawater desalination, brackish water desalination, seawater concentration salt production, industrial water desalination, etc. Background technique [0002] The existing electrodialysis method for water treatment by electrochemical methods uses the selective permeability of ion exchange membranes to make directional migration of electrolyte ions in water under the action of a direct current electric field, so as to realize water desalination or concentrated salt production . The specific process is: the positive and negative ions formed by the hydrolysis of salts ...

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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 shortcoming of existing electrodialysis method and equipment thereof is: 1) it is to become positive and negative ion by electric field action on anion and cation exchange membrane by electric field and finish by the migration of self-selection of salt in the solution, the migration velocity of positive and negative ion All depend on the structure, material and current density of the electrodialyzer, the nature of the water to be treated, etc. Once the equipment has been manufactured and installed properly, the above parameters are a foregone conclusion, so the water treatment speed and quality cannot be improved any more. If the efficiency cannot be improved, the power consumption cannot be reduced; 2) If scaling and electrode polarization occur on the anion and cation exchange membranes and the two electrodes, the electrodialysis performance and service life of the membrane and electrodes will be reduced, so it is necessary to It is rinsed, and in serious cases, it must be disassembled and washed, thereby reducing the ability of water treatment, and this operation is troublesome and time-consuming; if the method of frequent electrode reversal is used, the problem of scaling and polarization can be partially solved, but every time Inversion must also stop production, affecting productivity

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