Electrodialysis:
The electrodialysis process is the combination of electrochemical process and dialysis-diffusion process. Driven by an external DC electric field, anions and cations move to the anode and cathode respectively by using the selective permeability of ion exchange membrane (i.e. cations can permeate the cation exchange membrane and anions can permeate the anion exchange membrane). In the process of ion migration, if the fixed charge of the membrane is opposite to the charge of ions, ions can pass through; If they have the same charge, the ions are repelled, thus realizing the purpose of solution desalination, concentration, refining or purification, etc. Besides the conventional desalination, it is widely used in food, medicine and chemical industry, industrial waste water treatment, recovery of acid and metal from waste liquid formed by acid cleaning metal surface; recovering heavy metal ions from electroplating waste water; Recovery of sulfate from synthetic fiber wastewater Recovery of sulfite from pulp waste liquor. Used in the food industry, such as milk desalination system baby milk powder; Separation of ionic and non-ionic substances in the chemical industry; Electrodialysis can be used as artificial kidney in clinical treatment.

Bipolar membrane:
Bipolar membrane is a new type of ion-exchange composite membrane, which usually consists of a cation-exchange layer (N-type film) , interface hydrophilic layer (catalytic layer) and anion exchange layer (P-type membrane), it is the reaction membrane in the true sense. Under the action of the direct current electric field, the bipolar membrane can dissociate water, get hydrogen ion and hydroxyl ion on both sides of the membrane. Utilize this characteristic, combine the bipolar membrane with other anion and cation exchange membrane to form the bipolar membrane electrodialysis system, can transform salt in aqueous solution into corresponding acid and alkali under the situation of not introducing the new component, This method is called bipolar membrane electrodialysis, which is not only used to prepare acids and bases, but also can realize many functions and be used in many fields if it is skillfully combined with monopolar membrane.

Business Scope:
Biological fermentation, food and beverage, chemical separation, new energy, wastewater treatment, plant extraction