High-salinity Wastewater Treatment by Electrodialysis
Pharmaceutical intermediates and chemical Industry-High salt and high COD wastewater treatment Project by electrodialysis
Project Introduction
The high content of inorganic salts in high-salt and high-COD wastewater has strong inhibitory and toxic effects on microorganisms, and it is difficult to use biochemical treatment. Excessive COD results in coking of the evaporator and viscosity of the mother liquor in the evaporation. High-salt and high-COD wastewater is difficult to treat by conventional methods. The project uses a homogeneous membrane electrodialysis device to separate the salt and COD. The salt of the concentrated water is concentrated to 180g/L and then enters the evaporation system. The salt of the fresh water on the COD side is reduced to below 2g/L, and the biochemical process can be carried out smoothly.
Technological Process
The Project Site
Viscose fiber industry–De-acidification and de-alkalization project by electrodialysis
Project Introduction
In the production process of viscose fiber, a large amount of pressed waste lye is produced, which was previously transferred to a sewage treatment plant for neutralization with acid, which not only produces a large amount of solid waste, but also causes a waste of resources. The pressed alkali liquor is desalinized and reused by electrodialysis, and the semi-fiber after the desalination is subjected to acid hydrolysis, electrodialysis desalination and purification to produce xylose. This process is a classic case of zero emissions with the resource utilization of industrial waste and the realization of waste water. The project has been operating for two consecutive years, and can realize the treatment and reuse of 200,000 tons of high-content hemicellulose alkali pulp throughout the year, which is of great significance to the green transformation of traditional industrial processes.
Technological Process
The Project Site
Rare earth catalyst industry-Sodium nitrate concentration project by electrodialysis
Project Introduction
During the production process of rare earth oxide catalyst, a large amount of 3-5% sodium nitrate wastewater will be produced. The homogeneous membrane electrodialysis device is used to concentrate the sodium nitrate to more than 20% and enter the evaporation system. The dilute stream is treated by reverse osmosis to achieve water reuse. The homogeneous membrane electrodialysis solves the problem of low concentration ratio of heterogeneous membranes and some imported homogeneous membranes and the problem of no resistance to metal ion pollution, and at the same time realizes zero discharge and resource utilization of sodium nitrate-containing wastewater.
Technological Process
The Project Site
Refining catalyst industry-Ammonium nitrate concentration project by electrodialysis
Project Introduction
About 3% of ammonium nitrate wastewater is produced in the production process of refining catalysts, which is concentrated and desalinated by a homogeneous membrane electrodialysis device. After the concentration of ammonium nitrate in the concentrated water reaches 20%, it enters the evaporation system. The dilute water is treated by reverse osmosis to achieve water reuse. This process achieves resource utilization and zero discharge of wastewater containing ammonium nitrate.
Technological Process
The Project Site
Nano zirconium industry-Ammonium chloride concentration project by electrodialysis
Project Introduction
A large amount of high-ammonia wastewater is generated during the production of nano-zirconium, which is neutralized with hydrochloric acid to generate ammonium chloride wastewater. The homogeneous membrane electrodialysis device is used for the treatment. The electrodialysis concentrated water containing 17% ammonium chloride enters the MVR evaporation system to produce ammonium chloride solid for sale, and the dilute water is reprocessed and returned to the workshop for reuse. The project has been operating stably for 5 years, the recovery rate of ammonium chloride in the whole system is >98%, and the recovery rate of water is >98%, achieving zero discharge of salty wastewater.
Technological Process
The Project Site
Zirconia Industry-High salt wastewater zero discharge project by electrodialysis
Project Introduction
The high-salt waste water produced by the production process of zirconium oxychloride and zirconium carbonate is treated with a homogeneous membrane electrodialysis device and reverse osmosis. The concentrated solution with the concentration above 18% is treated by MVR, the dilute solution is treated by reverse osmosis to achieve water reuse. This process solves the problem of high salt water discharge.
Technological Process
The Project Site
Betaine Industry-Homogeneous Betaine desalination project by electrodialysis
Project Introduction
Sodium chloride is by-produced in the synthesis process of betaine. The original process adopts evaporation to separate out salt or heterogeneous membrane electrodialysis to remove salt, which has high operating cost, low desalination rate and low product quality. The use of homogeneous membrane electrodialysis device has the advantages of low operating cost and high desalination rate. At present, the device from Shandong Tianwei Membrane Technology Co., Ltd. has a utilization rate of more than 70% in the betaine industry.
Technological Process
The Project Site
Pesticide production industry-glufosinate desalination project by electrodialysis
Project Introduction
A homogeneous membrane electrodialysis process is used to separate glufosinate and chloride. The content of glufosinate and chloride in the feed liquid is 18.8% and 3.6%, respectively. After treatment with a homogeneous membrane electrodialysis device, the concentration of glufosinate and chloride in the dilute solution is 21.3% and 0.26%, respectively, and the concentration in the concentrated solution is 0.6% and 3.4%, respectively. This project realizes the separation of glufosinate and chloride, improving the purity of glufosinate. This process is widely applicable and reproducible in the production of glufosinate, and has broad application prospects.
The Project Site
Pickling industry-Wastewater COD and salt separation project by electrodialysis
Project Introduction
During the pickling process of pickled vegetables, a large amount of salt-containing and COD-containing wastewater is produced, and the salt content of the wastewater is 40,000 mg/L. The use of homogeneous membrane electrodialysis device can realize the separation of salt and COD. The salt content of the dilute water is ≤1000mg/L, and then enters the biochemical system; the salt content of the concentrated water reaches 150,000mg/L, which can be reused in the production process.
The Project Site
Flame retardant industry-Sodium bromide wastewater zero discharge project by electrodialysis
Project Introduction
Low-concentration sodium bromide wastewater is produced in the production process of flame retardants. The homogeneous membrane electrodialysis device can be used to concentrate sodium bromide in the wastewater from 1.5% to more than 15%. Then it enters the evaporation device to recover sodium bromide for sale, and the salt content of the dilute water is reduced to 0.1%, which can be directly returned to the process for recycling. The process not only reduces the cost of wastewater treatment, but also realizes the resource recycling of waste.
Chemical industry-Hydrochloric acid concentration project by electrodialysi
Project Introduction
The by-product waste water of the chemical production process contains 3% hydrochloric acid. The direct discharge of the hydrochloric acid waste water will cause serious environmental pollution. Using a homogeneous membrane electrodialysis device, the low-concentration hydrochloric acid can be concentrated to 7% and returned to the original process for reuse. This project solves the problem that low-concentration hydrochloric acid cannot be processed, and at the same time realizes low-cost reuse of dilute hydrochloric acid.
The Project Site
Metallurgical Industry-Sulfuric acid concentration project by electrodialysis
Project Introduction
Lead and zinc smelting acid production systems and wet smelting workshops discharge a large amount of polluted acid. The traditional neutralization process produces a large amount of waste residue. The homogeneous membrane electrodialysis device can be used to concentrate the acid to more than 10%, and then enter the evaporation system for further concentration and reuse, and the acid reuse rate exceeds 90%. The dilute solution is reused in the flue gas purification section, and the water reuse rate exceeds 60%. The process realizes the efficient recovery of acid and water resources, and greatly reduces the generation of solid waste.
Technological Process
The Project Site
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Production base: 00699 North Wisdom Third Street, Weifang Binhai Economic and Technological Development Zone
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