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Specific methods of wastewater zero discharge process in sewage treatment plants

by:BOQU     2023-03-27
Learn the specific method of wastewater zero discharge process in sewage treatment plants. At present, the problem of industrial wastewater treatment has become a major problem in our country. Most enterprises do not use wastewater treatment equipment because the operating cost is too high and the wastewater is not easy to meet the standard. Now the industry is trying Wastewater zero discharge technology is used to treat wastewater to achieve the goal of zero discharge of wastewater. So what is the zero discharge process of wastewater? The following editor will take you to understand. 1. Obtain the mixed salt of sodium chloride and sodium sulfate through direct evaporation and crystallization. 2. Sodium sulfate decahydrate is obtained by freezing and denitrification. The mother liquor containing a large amount of sodium chloride and a small amount of sodium sulfate is electrolyzed to produce caustic soda. Glauber's salt is melted and evaporated to obtain anhydrous sodium sulfate with high purity. 3. Co-production of salt and nitric acid, high temperature evaporation to obtain sodium sulfate, low temperature evaporation of the mother liquor to obtain sodium chloride, part of the mother liquor is discharged; or high temperature to obtain sodium chloride, low temperature evaporation of the mother liquor to obtain anhydrous sodium sulfate, part of the mother liquor is discharged; or high temperature evaporation Obtain anhydrous sodium sulfate, freeze and crystallize to precipitate the double salt of mirabilite and sodium chloride dihydrate, return the double salt to the original solution pool after evaporation to obtain anhydrous sodium sulfate, and evaporate the mother liquor of higher purity sodium chloride to obtain sodium chloride crystals , part of the mother liquor after centrifugation is discharged. 4. Nanofiltration membrane method, using the high interception rate of the sulfate ion by the nanofiltration membrane, the mixed solution is separated by the nanofiltration membrane to obtain the retentate with high sodium sulfate concentration and the permeate with high sodium chloride purity. The liquid is subjected to subsequent evaporation and crystallization to obtain sodium chloride crystalline salt. The retained liquid mainly containing sodium sulfate can be evaporated and crystallized to recover sodium sulfate, and can also be returned to the front-end pretreatment to remove calcium hardness. The content of the wastewater zero discharge process is introduced here for you, and I hope it will be helpful to you. Wastewater zero discharge process is a better solution for wastewater treatment nowadays.
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