The basic working principle of electrodialyzer in Cangzhou With the increasing demand for factory drainage in China, electrodialyzer has become a way of factory sewage treatment. The water treatment process of electrodialysis is that raw water (tap water) enters the electrodialyzer after passing through the activated carbon filter tank and the wire wound filter tank, and is divided into three ways after electrochemical treatment by the electrodialyzer: one way is extremely water, which is directly discharged; All the way is fresh water, which enters the fresh water storage bucket through the reversing electromagnetic valve for further ion exchange to make pure water with higher purity; There is also concentrated water all the way, which is wastewater with high ion concentration and can only be discharged outside the machine after passing through the reversing solenoid valve. Of the three kinds of water flowing from the electrodialyzer, fresh water accounts for about 45-51%, concentrated water accounts for about 41-51%, and polar water accounts for about 11-15%. The electrodialyzer can not only be used as a pretreatment device for ion exchange, which can reduce the later burden and improve the purity of water quality, but also can be used to soften water quality and supply boiler water, and can also be used to desalt and dealkalize water quality in saline-alkali land, improve beverage quality, treat wastewater, recover useful metals and provide medical care. The concentrated water channel and fresh water channel at the output end of electrodialyzer are not fixed, because the concentrated water channel will accumulate a large amount of salts and impurities for a long time, which will cause blockage and the quality of fresh water will not be guaranteed. Therefore, the concentrated water channel and the fresh water channel should be replaced frequently, but not too frequently, so as to avoid the concentrated water mixing into the fresh water storage bucket. Generally, it is advisable to change the direction once per shift (8h). Cangzhou Lijia Water Treatment Equipment Co., Ltd. is a professional enterprise of reverse osmosis equipment, electrodialysis equipment and electrodialysis device. The electrodialysis device is designed according to the electrodialysis principle and applied to the design, research and development, manufacture and processing of water treatment, membrane separation and filtration, as well as engineering contracting, installation and debugging. The high-temperature electrodialysis desalination method of brine includes the following steps: desalting the brine at high temperature, pumping it into an ultrafiltration pretreatment device through a centrifugal pump, pumping the pretreated brine into a jacketed electric heating tank through a centrifugal pump, heating to 61-81 DEG C, then sending the pretreated brine into an adsorption tank filled with a molecular sieve, standing for 4-6 hours, then sending the desalted brine into the jacketed electric heating tank, heating to 61-81 DEG C, and then sending the desalted brine into an electrodialysis device through a centrifugal pump. Preparing Na2SO4 solution with the concentration of 1.2-1.3 mol/L in electrodialysis device, pumping the Na2SO4 solution into the polar chamber of electrodialysis device by centrifugal pump until the conductivity of produced water at the outlet of desalting chamber of electrodialysis device drops to 511-811μ s/cm, and then pumping it into fresh water tank. According to the invention, high-temperature brine is effectively desalted through ultrafiltration pretreatment combined with high-temperature electrodialysis, so that the limit current of electrodialysis is improved, polarization precipitation is reduced, and the operation period of an electrodialysis device is prolonged. The inorganic salt (potassium sulfate) in simulated biodiesel wastewater was removed by electrodialysis. The influence of electrodialysis process factors on desalination effect was studied, and the influence of glycerol on electrodialysis desalination process was discussed.