Electrodialysis device / electrodialysis equipment purchase and manufacturers

Electrodialysis Technology definitions Chinese name: electrodialysis English name: electrodialysis, ED; electrodialysis; ED Definition 1: Select to potential difference is the driving force, the use of ion-exchange membrane permeability, the charged and uncharged component of salt water separation technology components. Dilute solution can be achieved, concentration, refining or purification processes. Respective disciplines: power (a subject); thermal automation, chemical plants and metal (two subjects) Definition 2: DC to power, the use of anion and cation exchange membrane selection of an aqueous solution of anion and cation permeability, so a water separation process of ion transfer to another body of water through the membrane. Applied science: Marine Science and Technology (a subject); Marine technology (two subjects); sea water resources development technologies (three subjects) works electrodialysis electrodialysis using the selection and development of semi-permeable membrane to separate different solutes permeability The method of particles (such as ions) is called dialysis. When dialysis in the electric field, charged particles in the solution of the solute (such as ions) migrate through the membrane and the phenomenon known as electrodialysis. Use of electrodialysis for purification and separation of materials technology called electrodialysis, it is the 1950s developed a new technology, initially for desalination, now widely used in chemical, light industry, metallurgy, paper making, medicine industry, especially in preparation of pure water and disposal of waste in the most attention in environmental protection, such as for acid recovery, electroplating waste water treatment and recovery of useful materials from industrial waste water and so on. About electrodialysis electrodialysis reverse osmosis membrane separation compared to another recent introduction of technology, it's cheap, but desalination rate. Current domestic ion exchange membrane quality is also very stable, operation and management is also very convenient. Essentially practical application, can be said to be an electrodialysis desalination technology, because a variety of water (including natural water, tap water, industrial waste water) have a certain amount of salt, and the salt of the composition of these anions and cations in the DC field electrodes respectively will move in the opposite direction under the action. If inserted in the female in an electrodialysis device, each of a cation exchange membrane, since the ion exchange membrane having selective permeability, i.e. a cation exchange membrane allows only cations freely through the anion exchange membrane allows only anions to pass, so that the two films in the compartment, the concentration of salt ions will be because of directed migration will reduce, rather close to the electrodes of the two compartments respectively anion and cation concentration compartment, and finally achieve the purpose of desalination desalination in the middle of the room. Practical applications, an electrodialysis not by a pair of anion and cation exchange membrane composition (because it is inefficient), instead of using one hundred pairs, or even hundreds of exchange membrane, thus greatly improving efficiency. Applications electrodialysis wide range of applications at present, it is the water desalination desalination, seawater concentrated salt refining dairy products, fruit juices fine deacidification and purification, preparation of chemical products, etc., can also be used for food, light industry Preparation of pure water, electronics, pharmaceutical and other industrial production of high water pre-treatment. Primary boiler feed water softening desalination, brackish water desalination of the water. Electrodialysis is used in electronics, pharmaceutical, chemical, power generation, food, beer, beverage, printing and coating industries such as water treatment. Concentrate can also be used for materials, purification, separation and other physical and chemical processes. Electrodialysis can also be used to recover waste water, waste water treatment and precious metals, such as the recovery of nickel from electroplating waste. Basic performance (1) Operating pressure 0.5─3.0kg / cm2 around (2) operating voltage, current 100─250V, 1─3A (3) the body of fresh water consumption per ton of approximately 0.2─2.0 electrodialysis features ① can while the aqueous electrolyte solution from dilution, concentration, separation, purification effect; ② can be used for purification of non-electrolyte such as sucrose, to remove the electrolyte; ③ In principle, the electrodialysis is a membrane electrolysis cell with, can be used high efficiency oxidation reduction electrode. In the electrodialysis process, also the following procedures ① secondary migration of ions of the same name, the ion exchange membrane selective permeability often not be one hundred percent and therefore there will always be a small amount of counter ion-exchange membrane through; ② ion concentration poor diffusion, since the concentrate chamber and the dilution chamber there was a concentration difference, there is always a small amount of ions from migration to dilute the concentration compartment diffusion chambers, thereby reducing the efficiency of dialysis; ③ water infiltration, although exchange membranes are not allowed solvent molecules through, but due to the concentration difference between the desalination chamber and concentrate chamber, it will make part of the solvent molecules (water) to the concentrate compartment penetration; ④ water electrodialysis, since hydration and ion electric double layer is formed under DC electric field, the water molecules can migrate from desalination chamber to concentrate chambers; polarization ionization ⑤ water, sometimes due to poor working conditions, will be forced to water and electricity from hydrogen ions and hydroxide ions, they can through the exchange membranes into the concentrating compartment; ⑥ pressure water seepage, due to the difference in fluid pressure between the concentrating compartments and desalination chambers, forcing water molecules from the pressure side to the pressure side of the penetration. Obviously, these secondary electrodialysis process is unfavorable factors, but they can be avoided or controlled by varying operating conditions.