Bipolar membrane electrodialysis integrated equipment for acid-base wastewater treatment

NegotiableUpdate on 04/07

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Overview

Bipolar membrane technology can convert corresponding inorganic salts into acids and bases, for example: sodium sulfate wastewater can be converted into sulfuric acid and sodium hydroxide; Sodium chloride wastewater can be converted into HCl and NaOH

Product Details

　　Preparation of acid-base by bipolar membrane electrodialysisSimply put, bipolar membrane electrodialysis technology is a type of electrodialysis technology that relies on the functionalization of membrane performance.

For high salt wastewater, bipolar membrane technology can convert corresponding inorganic salts into acids and bases. For example, sodium sulfate wastewater can be converted into sulfuric acid and sodium hydroxide; Sodium chloride wastewater can be converted into HCl and NaOH. At present, more and more bipolar membrane process technologies can be seen in the overall process package.

For users, it solves the problem of treating end of pipe waste salt, generates alkali and acid with certain economic benefits, and effectively realizes the recycling economy of salt containing wastewater resources.

For companies, they can provide more innovative and stable coupling process packages, which have enough highlights to catch the attention of users in certain systems with severe homogenization competition.

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　　Preparation of acid-base by bipolar membrane electrodialysisIt is a new type of ion exchange composite membrane, which is usually composed of a cation exchange layer and an anion exchange layer. Using membrane materials with different charge densities, thicknesses, and properties under different composite conditions, bipolar membranes with different properties and applications can be made. The basic principle of these applications is the dissociation of water molecules at the interface layer of the bipolar membrane under reverse pressure (also known as bipolar membrane hydrolysis dissociation), which decomposes water into hydrogen ions and hydroxide ions.

Bipolar membrane electrodialysis is developed based on the principles of water dissociation and ordinary electrodialysis mentioned above. It is composed of a bipolar membrane replacing some of the negative and positive membranes of ordinary electrodialysis or adding a bipolar membrane between the negative and positive membranes of ordinary electrodialysis.

The basic application of bipolar membrane electrodialysis is to prepare corresponding acids (HX) and bases (MOH) from salt solution (MX), as shown in the figure. The feed solution enters the three chamber electrodialysis membrane stack, and under the action of a direct current electric field, the salt anions (X -) enter the acid chamber through the anion exchange membrane and dissociate with the hydrogen ions of the bipolar membrane to form acids (HX); And the salt cation (M+) enters the base chamber through the cation exchange membrane, where it dissociates with the hydroxide ions of the bipolar membrane to form a base (MOH).

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