Preparation of complete equipment for acid-base bipolar membrane electrodialysis wastewater treatment

NegotiableUpdate on 04/07

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Overview

Prepare negatively charged anions for acid-base bipolar membrane electrodialysis, move towards the anode to the negative membrane, and be attracted by the opposite polarity of positively charged groups on the membrane, passing through the membrane and entering the concentration chamber on the left. The sodium chloride in the desalination chamber is continuously removed to obtain fresh water, and the sodium chloride is concentrated in the concentration chamber. The use of bipolar membrane electrodialysis technology to prepare acid-base has significant advantages: low energy consumption, small equipment size, and can save investment; The entire process has no oxidation or recovery reactions, no side reaction products, and no pollution.

Product Details

　　Preparation of acid-base bipolar membrane electrodialysisBipolar membrane is a new type of ion exchange composite membrane, which is usually composed of a cation exchange layer and an anion exchange layer. Membrane materials with different charge densities, thicknesses, and properties can be used to make bipolar membranes with different properties and applications under different composite conditions. 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), which decomposes water into hydrogen ions and hydroxide ions.

It 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 is to prepare corresponding acids (HX) and bases (MOH) from salt solution (MX). The feed solution enters the three chamber electrodialysis membrane stack, and under the action of a direct current electric field, salt anions (X -) enter the acid chamber through the anion exchange membrane and dissociate with hydrogen ions from the bipolar membrane to generate 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).

　　Preparation of acid-base bipolar membrane electrodialysisIt is the process in which charged ions in a solution selectively pass through an ion exchange membrane under the effect of a direct current electric field. Mainly used for separating electrolytes in solution.

Introduce saltwater into the desalination chamber, connect the power supply, and the positively charged cations in the solution will move towards the cathode under the effect of the electric field and reach the positive membrane. They will be attracted by the opposite polarity of the negatively charged groups on the membrane and pass through the membrane, entering the concentration chamber on the right side.

Anions with negative charges move towards the anode and are attracted by the opposite polarity of positively charged groups on the membrane, passing through the membrane and entering the concentration chamber on the left. The sodium chloride in the desalination chamber is continuously removed to obtain fresh water, and the sodium chloride is concentrated in the concentration chamber.

The use of bipolar membrane electrodialysis technology to prepare acid-base has significant advantages: low energy consumption, small equipment size, and can save investment; The entire process has no oxidation or recovery reactions, no side reaction products, and no pollution.