High-stability wastewater treatment system
A wastewater treatment system and high-stability technology, used in metallurgical wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem that the cation exchange membrane is easily corroded, polluted, and the electroplating wastewater process is difficult to operate stably for a long time. and other problems, to avoid insufficient membrane mechanical properties and electrical conductivity, realize the reduction of wastewater discharge, and simple control of reaction conditions.
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Embodiment 1
[0030] like figure 1 As shown in the figure, a high-stability wastewater treatment system includes a water inlet unit, a pretreatment unit, an electrodialysis unit, and a back-end concentration unit, which are arranged in sequence and connected by pipelines. The water inlet unit includes a water inlet tank 1 and a Booster pump 2, the pretreatment unit includes a sand filter tank 3 and a carbon filter tank 4, the electrodialysis unit is an electrodialyzer 5, and the back-end concentration unit includes an evaporation concentration tower 6 and a circulating pump 7.
[0031] like figure 2 As shown, the electrodialyser includes an anode 51, a cathode 52, a cation exchange membrane 53, an anion exchange membrane 54, a rubber plate 55, a clamping plate 56, the anode and the adjacent cation exchange membrane form an anode chamber, the cathode A cathode chamber is formed with the adjacent cation exchange membrane, the anion exchange membrane and the adjacent cation exchange membran...
Embodiment 2
[0039] The difference between this example and Example 1 is only that the preparation method of the sulfonated cage polyhedral oligomeric silsesquioxane modified polyvinylidene fluoride membrane comprises the following steps:
[0040] (1) Membrane surface modification: The polyvinylidene fluoride membrane was soaked in a 12 mol / L potassium hydroxide solution containing tetrabutylammonium bromide for 3 hours, and then rinsed three times with distilled water to obtain a surface-modified polyvinylidene fluoride. membrane;
[0041] (2) Grafting of caged polyhedral oligomeric silsesquioxane: Mix the caged polyhedral oligomeric silsesquioxane containing silicon-hydrogen bonds with the following structural formula and Custer catalyst in a solvent, and then modify the surface The polyvinylidene fluoride membrane was immersed in the solution, reacted at 60 °C for 2 hours, washed and dried to obtain a cage-shaped polyhedral oligomeric silsesquioxane grafted polyvinylidene fluoride membr...
Embodiment 3
[0046] The difference between this example and Example 1 is only that the preparation method of the sulfonated cage polyhedral oligomeric silsesquioxane modified polyvinylidene fluoride membrane comprises the following steps:
[0047] (1) Membrane surface modification: The polyvinylidene fluoride membrane was immersed in 8 mol / L sodium hydroxide solution containing tetrabutylammonium hydrogen sulfate for 6 hours, and then rinsed three times with distilled water to obtain surface-modified polyvinylidene fluoride. membrane;
[0048] (2) Grafting of caged polyhedral oligomeric silsesquioxane: Mix the caged polyhedral oligomeric silsesquioxane containing silicon-hydrogen bonds with the following structural formula and Custer catalyst in a solvent, and then modify the surface The polyvinylidene fluoride film was soaked in the solution, reacted at 40 °C for 6 hours, washed and dried to obtain a cage-shaped polyhedral oligomeric silsesquioxane grafted polyvinylidene fluoride film;
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