Bipolar membrane electrodialysis device

Abstract

The invention relates to a bipolar membrane electrodialysis device, which comprises a plurality of diaphragms and a dialysis chamber, wherein the plurality of diaphragms comprise at least two bipolarmembranes, at least one anode membrane and at least one cathode membrane; at least three separation chambers consisting of at least one alkaline chamber, at least one salt chamber and at least one acid chamber are formed in the dialysis chamber; the periphery of each diaphragm is tightly connected with the inner wall of the dialysis chamber through a corresponding flexible connecting part according to a mode that under the pressure difference effect of the adjacent separation chamber, the corresponding diaphragms are allowed to move, and further, the volume of the adjacent separation chamber is changed. The diaphragms can be connected with the dialysis chamber in a movable mode through the flexible connecting parts, so that under the pressure difference effect of the adjacent separation chamber, the corresponding diaphragms are allowed to move, and further, the volume of the adjacent separation chamber is changed; further, during the flow fluctuation, the diaphragms move so as to fastreduce the pressure difference of the adjacent separation chamber; the leakage caused by the pressure difference is reduced; the frequent regulation on the liquid inlet flow or the liquid outlet flowis not needed; economical performance and high efficiency are realized.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a bipolar membrane electrodialysis device. Background technique [0002] A bipolar membrane is a layered membrane with a cation exchange layer on one side and an anion exchange layer on the other. The junction of the cation exchange layer and the anion exchange layer is a water layer. Under the action of an external DC electric field, the water layer Splitting water into H + and OH - , and pass through the cation exchange layer and the anion exchange layer respectively. The bilayer membrane is a key component of bipolar membrane electrodialysis (BPED). BPED is an electrodialysis device that uses bipolar membrane dissociated water and the selective permeability of anion and cation exchange membranes to convert salt into acid and alkali. [0003] Under the action of a direct current electric field, the ions in the solution undergo directional migration, and the cations in the sal...

AI Technical Summary

Problems solved by technology

For the change of pressure difference caused by flow fluctuation, it is slow and uneconomical to simply rely on the pressure gauge installed near the water inlet to monitor the pressure and then adjust the water supply of the corresponding supply pump or the water output of the corresponding water outlet.

Also, pressure differentials can cause problems with increased risk of diaphragm deformation, damage and / or water leakage

[0008] But at present, the technology to solve the leakage in this field is to measure the pressure difference of adjacent compartments through pressure gauges. After the pressure difference is measured, the pressure difference and leakage can be reduced by adjusting the inflow or outflow of the corresponding compartment. , as mentioned above, this operation is slow and uneconomical, and if the pump is frequently controlled to adjust the pumping flow, it will easily cause damage to the pump. Solve the problem of leakage from another new angle

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