Working principle of water purifier and water purification technology(2)

Update:28 Dec 2019

Method / step 3:
    Water softening
    Ion exchange softening method: H +, Na + and other cations in the active gene of ion exchanger (ion exchange resin) are used for ion exchange with the hardness components Ca2 + and Mg2 + in water to remove Ca2 + and Mg2 + to achieve the purpose of softening. Working process: adsorption, saturation, reduction (regeneration).
    Demineralized water refers to water that removes or reduces the hardness of water (mainly refers to calcium and magnesium ions in water) to a certain extent.
    Softened water: Mainly used for boiler water.
    The role of activated carbon in water treatment: Activated carbon is a desiccant adsorbent made of carbon-based substances (charcoal, wood chips, coconut shell, walnut shell, coal, etc.) as raw materials, which are carbonized and activated at high temperature. Activated carbon is widely used in domestic water and food industry, chemical industry, electric power and other industries. Purification, dechlorination, degreasing and organic matter removal of industrial water.
    Method / step 4:
    Basic Principles of Electrodialysis
    Dialysis refers to the phenomenon in which a solute in a solution penetrates a semi-permeable membrane. The driving force of natural dialysis is the difference in the concentration of solutes on both sides of the semipermeable membrane. The phenomenon of ions passing through a selective ion exchange membrane under the action of a DC electric field is called electrodialysis (ED). The ion-exchange membrane is a thin film having selective permeability for ions made of a polymer material. Mainly divided into two types of cation exchange and anion exchange membrane. The ability of the positive and negative ions to pass through the anion is called the selective permeability of the membrane.
    The basic working unit of the electrodialysis process is a membrane pair. A membrane pair constitutes a desalination chamber and a concentration chamber. It consists of a male membrane, a fresh water barrier, a negative membrane and a dense water barrier. A practical electrodialysis consists of hundreds of membrane pairs. The main application areas are desalination of brackish water, desalination of sea water, preparation of pure water and water used in beverages, pharmaceuticals, mineral water, dairy products and other industries. Advantages: At the same time when preparing pure water, the (concentrated water) containing calcium, magnesium, chlorine and other ions in the water is discharged in the other way.