A method and system for treating anodizing wastewater

Abstract

A method and system for treating anodizing wastewater, wherein the anodizing wastewater includes nickel-containing wastewater, inorganic wastewater, dyeing wastewater, and phosphorus-containing wastewater. The present invention provides methods for treating the above-mentioned nickel-containing wastewater, inorganic wastewater, dyeing wastewater, and phosphorus-containing wastewater, as well as nickel-containing wastewater treatment systems, inorganic wastewater treatment systems, dyeing wastewater treatment systems, drainage water systems, and phosphorus-containing wastewater treatment systems that implement the above-mentioned methods and are interrelated. After being treated by the method and system of the present invention, the anodizing wastewater on the production line can be fully circulated and purified, and the purified produced water can meet the discharge standards or be reused. The present invention solves the difficulties in the traditional anodizing wastewater treatment process and saves treatment costs.

Description

Technical Field

[0001] The present invention relates to the field of sewage purification, and in particular to a method and system for treating anodized wastewater.

[0002] Anodizing refers to the electrochemical oxidation of metals or alloys. Metals and their alloys form an oxide film on metal products (anodes) under the action of an applied current in the corresponding electrolyte and specific process conditions. Anodizing technology is a common and main technology in surface treatment in the electroplating industry. It is widely used in the electroplating industry, and a large amount of anodizing wastewater is generated. Anodizing wastewater includes nickel-containing wastewater, inorganic wastewater, dyeing wastewater and phosphorus-containing wastewater.

[0003] Nickel-containing wastewater contains nickel, a type of pollutant that is strictly controlled by the country. Dyeing wastewater contains a high concentration of chroma. Phosphorus-containing wastewater contains a high concentration of phosphorus and oil. This is the main difficulty in treating anodized wastewater. As emission standards become more and more stringent, the difficulty of treating anodized wastewater has increased. In addition, the current methods and systems for treating anodized wastewater are also difficult to comprehensively treat various different wastewaters in anodized wastewater, and the treatment cost is relatively high. At present, phosphorus-containing wastewater generally uses the precipitation method to remove phosphorus. Commonly used phosphorus removal agents for phosphorus-containing wastewater include iron salts, calcium salts, and aluminum salts. Since calcium salts are prone to scaling, they affect subsequent membrane treatment. Therefore, it is very important to invent a method and system for treating anodized wastewater that saves costs and can reduce the addition of flocculants. Summary of the invention

[0004] The purpose of the present invention is to provide a method and system for treating anodizing wastewater, so as to solve the treatment problems of traditional anodizing wastewater treatment processes and save treatment costs.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A method for treating anodizing wastewater, wherein the anodizing wastewater includes nickel-containing wastewater, inorganic wastewater, dyeing wastewater, and phosphorus-containing wastewater, and the steps are:

[0007] Treatment method of nickel-containing wastewater:

[0008] Step 1a, discharge the nickel-containing wastewater into a nickel-containing wastewater regulating tank to adjust the water quality and water quantity, and pump it into a first pH adjustment tank, add NaOH and aerate and stir, adjust the pH value to 9-11, and the nickel ions and hydroxide ions in the wastewater form nickel hydroxide precipitates;

[0009] Step 1b, discharge the wastewater into the first rapid mixing tank, add polyaluminium chloride (PAC) as a coagulant and aerate and stir to coagulate the precipitated precipitate into larger particles;

[0010] Step 1c, then discharge the wastewater into the first slow mixing tank, add the polymer flocculant PAM and stir it, so that the particles in the water form large flocs;

[0011] Step 1d, discharging the sewage in the first slow mixing tank into the first primary sedimentation tank for gravity sedimentation, and the precipitated sludge enters the sludge hopper and is regularly discharged into the nickel-containing sludge concentration tank;

[0012] Step 1e, discharging the supernatant of the first primary sedimentation tank into the first second pH adjustment tank, adding NaOH again and aerating and stirring, adjusting the pH value to 9-11, and the nickel ions and hydroxide ions in the wastewater form nickel hydroxide precipitates;

[0013] Step 1f, discharge the wastewater into the first and second quick mixing tanks, add coagulant polyaluminium chloride (PAC), and aerate and stir to coagulate the precipitated precipitate into larger particles;

[0014] Step 1g, discharge the wastewater from the first and second fast mixing tanks into the first and second slow mixing tanks, add the polymer flocculant PAM and stir, under the adsorption and capture action of the PAM, the particles in the water form large flocs;

[0015] Step 1h, discharge the wastewater from the first and second slow mixing tanks into the first inclined tube sedimentation tank for gravity sedimentation, the precipitated sludge enters the mud hopper, and is regularly discharged into the nickel-containing sludge concentration tank, the sludge in the nickel-containing sludge concentration tank is filtered by the first chamber filter press, the dry sludge is transported out, and the filtrate is discharged into the nickel-containing wastewater regulating tank for further treatment;

[0016] Step 1i, discharging the supernatant of the first inclined tube sedimentation tank into the intermediate clear water tank, adding sulfuric acid to the intermediate clear water tank to adjust the pH value to 6.5-7.5 and aerate and stir, and then pumping the wastewater into the first quartz sand filter for treatment, if the nickel ion content of the effluent from the first quartz sand filter is low, it is directly discharged into the inorganic clear water tank in the inorganic wastewater treatment system; if the nickel ion content is high, the effluent is treated by an ion exchanger and discharged into the inorganic clear water tank in the inorganic wastewater treatment system;

[0017] Step 2, treatment method of inorganic wastewater:

[0018] Step 2a, the inorganic wastewater is collected separately and discharged into the inorganic wastewater regulating tank to adjust the water quality and quantity, and then the wastewater is pumped into the second pH adjustment tank, NaOH is added for aeration and stirring, and the pH value is adjusted to 8.5-9, and the aluminum ions and hydroxide ions in the wastewater form aluminum hydroxide precipitates;

[0019] Step 2b, discharge the wastewater into the second rapid mixing tank, add polyaluminium chloride (PAC) as a coagulant and aerate and stir to coagulate the precipitated precipitate into larger particles;

[0020] Step 2c, then discharge the wastewater into the second slow mixing tank, add the polymer flocculant PAM and stir, so that the particles in the water form large flocs;

[0021] Step 2d, the sewage in the second slow mixing tank is discharged into the second primary sedimentation tank for gravity sedimentation, the precipitated sludge enters the sludge hopper, and is regularly discharged into the comprehensive sludge thickening tank. The sludge in the comprehensive sludge thickening tank is filtered by the second chamber filter press, the dry sludge is transported out, and the filtrate is discharged into the phosphorus-containing wastewater regulating tank for treatment;

[0022] Step 2e, discharge the supernatant of the second primary sedimentation tank into the inorganic clean water tank, pump the wastewater of the inorganic clean water tank into the second quartz sand filter of the reuse water system for treatment, and then treat it through the activated carbon filter, and then discharge the filtered wastewater into the UF membrane system through a pipeline for treatment; add sulfuric acid through the first pipeline mixer to the water inlet pipeline of the UF membrane system to adjust the pH value, add the reducing agent sodium bisulfite through the second pipeline mixer to adjust the redox potential, and add the scale inhibitor through the third pipeline mixer to make the pH value of the water body reach 6.5-7.5 before the UF membrane system treatment, so that the redox potential is controlled at ±150mv; after the wastewater is treated by the UF membrane system, the effluent of the UF membrane system is discharged into the UF water production pool;

[0023] Step 2f, discharge the effluent from the UF water production pool into the primary RO system, the produced water of the primary RO system is discharged into the primary RO water production tank, and the concentrated water produced by the primary RO system is discharged into the dyeing wastewater regulating tank for treatment; part of the water in the primary RO water production tank is reused as tap water, and part is discharged into the secondary RO system, the produced water of the secondary RO system enters the pure water production tank, the water in the pure water production tank is reused as pure water, and the concentrated water produced by the secondary RO system is returned to the primary RO system for re-treatment;

[0024] Step 3, treatment method of dyeing wastewater:

[0025] Step 3a, the dyeing wastewater is collected separately and then enters the dyeing wastewater regulating tank to adjust the water quality and quantity, and then pumped into the third pH adjustment tank, sulfuric acid is added to adjust the pH value to 3-4 and aerated and stirred, and the effluent is discharged into the Fenton reaction tank;

[0026] Step 3b, adding H2O2 and FeSO4 to the Fenton reaction tank respectively to carry out Fenton reaction and aerate and stir, and the effluent after the Fenton reaction is discharged into the third pH adjustment tank;

[0027] Step 3c, adding NaOH to the third pH adjustment tank for aeration and stirring to adjust the pH value to 7-8, and discharging the effluent into the third reduction reaction tank;

[0028] Step 3d, adding reducing agent NaHSO3 to the third reduction reaction tank and stirring to control the redox potential at ±150mv, and the effluent enters the third fast mixing tank;

[0029] Step 3e, adding a coagulant polyaluminium chloride (PAC) into the third fast mixing tank and aerating and stirring to coagulate the suspended matter in the sewage into larger particles, and then discharging the sewage into the third slow mixing tank;

[0030] Step 3f, adding a high molecular weight flocculant PAM into the third slow mixing tank and stirring, so that the particles in the water form large flocs;

[0031] Step 3g, the sewage from the third slow mixing tank is discharged into the third inclined tube sedimentation tank for gravity sedimentation, the precipitated sludge enters the mud hopper, and is regularly discharged into the comprehensive sludge thickening tank. The sludge in the thickening tank is filtered by the second chamber filter press, and the dry sludge is transported out, and the filtrate is discharged into the phosphorus-containing wastewater regulating tank for further treatment;

[0032] Step 3h, discharge the supernatant of the third inclined tube sedimentation tank into the third intermediate tank, add sulfuric acid for aeration and stirring, adjust the pH value to 6.5-7.5, and then discharge the effluent into the anaerobic tank in the biochemical system;

[0033] Step 3i, subjecting the wastewater from the anaerobic tank to anaerobic reaction and stirring, then discharging the anaerobic effluent into the anoxic tank for denitrification reaction and stirring, then discharging the effluent into the aerobic tank for oxidation and nitrification reaction, and then pumping the mixed solution from the aerobic tank back to the anoxic tank for further denitrification reaction;

[0034] Step 3j, the effluent from the aerobic pool is discharged into the MBR membrane pool, and the wastewater is filtered through the ultrafiltration membrane assembly and then pumped into the MBR water production pool, while the sludge is retained in the MBR membrane pool. The retained sludge is pumped back to the anaerobic pool, the anoxic pool and the aerobic pool; part of the water from the MBR water production pool is discharged into the UF water production pool of the inorganic wastewater treatment system for reuse water treatment, and the other part enters the discharge water pH adjustment pool of the discharge water system for further treatment;

[0035] Step 3k, adding sulfuric acid to the discharge water pH adjustment tank and aerating and stirring to adjust the pH value to 3-4, and the effluent is discharged into the discharge water Fenton reaction tank;

[0036] Step 31, respectively adding H202 and FeSO4 to the discharge water Fenton reaction tank to perform Fenton reaction and aerate and stir, and the effluent after the Fenton reaction enters the discharge water pH adjustment tank;

[0037] Step 3m, adding NaOH to the discharge water pH adjustment tank and aerating and stirring to adjust the pH value to 7-8, and then the effluent enters the discharge water reduction reaction tank;

[0038] Step 3n, adding reducing agent NaHSO3 to the discharge water reduction reaction tank and stirring, so that the redox potential is controlled at ±150mv, and the effluent enters the discharge water fast mixing tank;

[0039] Step 3o, adding coagulant polyaluminium chloride (PAC) into the discharge water fast mixing tank and aerating and stirring to coagulate the suspended matter in the sewage into larger particles, and then discharge the wastewater into the discharge water slow mixing tank;

[0040] Step 3p, adding a high molecular weight flocculant PAM to the discharge water slow mixing tank and stirring, so that the particles in the water form large flocs, and then the water is discharged into the discharge water sedimentation tank for gravity sedimentation, and the precipitated sludge enters the mud hopper and is regularly discharged into the comprehensive sludge thickening tank. The sludge in the sludge thickening tank is filtered by the second chamber filter press and then the dry sludge is transported out, and the filtrate is discharged into the phosphorus-containing wastewater regulating tank for further treatment;

[0041] Step 3q, discharging the supernatant of the discharge water sedimentation tank into the discharge water intermediate tank, and lifting the wastewater in the discharge water intermediate tank to the discharge water aerated biological denitrification filter tank, and then the effluent enters the discharge water aerated biological nitrification filter tank, and then the effluent of the discharge water aerated biological nitrification filter tank enters the discharge water pool;

[0042] Step 3r, add NaOH or H2SO4 to the discharge water pool and aerate and stir, adjust the pH value to 6-9, and discharge the effluent in compliance with the standards.

[0043] Step 4, treatment method of phosphorus-containing wastewater:

[0044] Step 4a, the phosphorus-containing wastewater is collected separately and discharged into a phosphorus-containing wastewater regulating tank to adjust the water quality and quantity, and then the wastewater in the phosphorus-containing wastewater regulating tank is pumped into a fourth pH adjustment tank in the flotation device;

[0045] Step 4b, adding NaOH to the fourth pH adjustment tank and aerating and stirring, adjusting the pH value to 9-10, and then discharging the effluent into the fourth dephosphorization reaction tank in the air flotation device;

[0046] Step 4c, adding a dephosphorization agent to the fourth dephosphorization reaction tank for stirring and reaction, and then discharging the wastewater into the fourth slow mixing tank in the air flotation device;

[0047] Step 4d, adding a high molecular flocculant PAM to the fourth slow mixing tank and stirring to perform a flocculation reaction, the particles in the water form large flocs, and then the wastewater is discharged into the flotation tank in the flotation device, the flocs form scum, the scum is scraped into the scum tank, and discharged into the comprehensive sludge thickening tank by gravity sludge discharge, the sludge in the comprehensive sludge thickening tank is filtered by the second chamber filter press, the dry sludge is transported out, the filtrate flows into the phosphorus-containing wastewater regulating tank for further treatment, and the drainage of the flotation tank enters the fourth second pH adjustment tank for further phosphorus removal reaction;

[0048] Step 4e, adding NaOH to the fourth second pH adjustment tank and aerating and stirring, adjusting the pH value to 9-10, and then discharging the effluent into the fourth second phosphorus removal reaction tank;

[0049] Step 4f, adding a dephosphorization agent to the fourth second dephosphorization reaction tank and stirring the reaction, and then discharging the wastewater into the fourth second slow mixing tank;

[0050] Step 4g, adding a high molecular flocculant PAM to the fourth second slow mixing tank and mechanically stirring to perform a flocculation reaction, so that the particles in the water form large flocs, and then the wastewater is discharged into the fourth first primary sedimentation tank for gravity sedimentation, and the precipitated sludge enters the mud hopper and is regularly discharged into the comprehensive sludge thickening tank. The sludge in the sludge thickening tank is filtered by the second chamber filter press, and the dry mud is transported out, and the filtrate is discharged into the phosphorus-containing wastewater regulating tank for further treatment, and the supernatant of the fourth first primary sedimentation tank is discharged into the fourth third pH adjustment tank for further phosphorus removal reaction;

[0051] Step 4h, adding NaOH to the fourth third pH adjustment tank and aerating and stirring to adjust the pH to 9-10, and then discharging the wastewater into the fourth first fast mixing tank;

[0052] Step 4i, adding a coagulant polyaluminium chloride (PAC) into the fourth fast mixing tank and aerating and stirring, the precipitated precipitate is coagulated into larger particles, and then the wastewater is discharged into the fourth slow mixing tank;

[0053] Step 4j, adding a high molecular weight flocculant PAM into the fourth slow mixing tank and stirring, so that the particles in the water form large flocs, and then discharging the wastewater into the secondary sedimentation tank;

[0054] Step 4k, the flocs are gravity precipitated in the secondary sedimentation tank, the precipitated sludge enters the sludge hopper and is regularly discharged into the comprehensive sludge thickening tank. The sludge in the comprehensive sludge thickening tank is filtered by the second chamber filter press, and the dry sludge is transported out. The filtrate is discharged into the phosphorus-containing wastewater regulating tank for further treatment, and the supernatant of the secondary sedimentation tank is discharged into the fourth intermediate tank for transfer, and then the wastewater of the fourth intermediate tank is pumped into the third pH callback tank of the dyeing wastewater treatment system for further treatment.

[0055] Furthermore, in steps 1b and 1f of the method for treating nickel-containing wastewater, step 2b of the method for treating inorganic wastewater, steps 3e and 3o of the method for treating dyeing wastewater, and step 4i of the method for treating phosphorus-containing wastewater, the amount of coagulant polyaluminum chloride PAC added each time is 500-800 mg / L, and the stirring and mixing reaction time is 30 minutes.

[0056] Furthermore, in order to ensure the flocculation effect and obtain the ideal coagulation effect, the stirring time is shortened within an appropriate range. In steps 1c and 1g of the nickel-containing wastewater treatment method, step 2c of the inorganic wastewater treatment method, steps 3f and 3p of the dyeing wastewater treatment method, and steps 4d, 4g, and 4j of the phosphorus-containing wastewater treatment method, the amount of polymer flocculant PAM added each time is 5 to 8 mg / L, and the stirring and mixing reaction time is 30 minutes. The average velocity gradient G value controlled by the mixing and stirring intensity is 30 to 60 s-1.

[0057] Furthermore, in order to ensure the effect of the Fenton reaction, the amount of H202 added to the Fenton reaction tank is 100-200 mg / L, the amount of FeSO4 added is 200-300 mg / L, and the stirring mixing reaction time is 1 hour.

[0058] Furthermore, in order to increase the efficiency of the biochemical system treatment, the mixed liquid in the aerobic tank is returned to the anoxic tank at a return ratio of 100 to 400%.

[0059] Furthermore, in order to ensure the effect of the phosphorus removal reaction and reduce costs, the phosphorus removal agent added to the fourth phosphorus removal reaction tank and the fourth second phosphorus removal reaction tank is FeSO4, and the added amount is 80-100 mg / L.

[0060] Furthermore, in order to more effectively prevent the formation of scale and microbial slime and improve the system's desalination rate and water production, the scale inhibitor added to the third pipeline mixer is LTLD-RO scale inhibitor, and the added amount is 3 to 5 ppm.

[0061] The present invention also provides an anodizing wastewater treatment system for implementing the above method, including an associated nickel-containing wastewater treatment system, an inorganic wastewater treatment system, a dyeing wastewater treatment system, a drainage water system, and a phosphorus-containing wastewater treatment system;

[0062] The nickel-containing wastewater treatment system comprises a nickel-containing wastewater regulating tank, a first pH adjustment tank, a first fast mixing tank, a first slow mixing tank, a first primary sedimentation tank, a nickel-containing sludge thickening tank, a first chamber filter press, a first second pH adjustment tank, a first second fast mixing tank, a first second slow mixing tank, a first inclined tube sedimentation tank, an intermediate clear water tank, a first quartz sand filter, and an ion exchanger. The outlet of the nickel-containing wastewater regulating tank is connected to the first pH adjustment tank, the outlet of the first pH adjustment tank is connected to the first fast mixing tank, the outlet of the first fast mixing tank is connected to the first slow mixing tank, and the outlet of the first slow mixing tank is connected to the first primary sedimentation tank; the outlet of the first primary sedimentation tank is connected to the nickel-containing sludge thickening tank, and the nickel-containing sludge thickening tank The outlet of the pool is connected to the first chamber filter press by a pump, and the other outlet of the first primary sedimentation tank is connected to the first second pH adjustment tank; the outlets of the first second pH adjustment tank are connected to the first second fast mixing tanks, the outlets of the first second fast mixing tanks are connected to the first second slow mixing tanks, and the outlets of the first second slow mixing tanks are connected to the first first inclined tube sedimentation tank; one outlet of the first first inclined tube sedimentation tank is connected to the nickel-containing sludge concentration tank, and the other outlet is connected to the intermediate clear water tank; the outlet of the intermediate clear water tank is connected to the first first quartz sand filter; one outlet of the first first quartz sand filter is connected to the inorganic clear water tank in the inorganic wastewater treatment system, and the other outlet is connected to the ion exchanger; the outlet of the ion exchanger is connected to the inorganic clear water tank of the inorganic wastewater treatment system;

[0063] The inorganic wastewater treatment system includes an inorganic wastewater regulating tank, a second pH adjustment tank, a second fast mixing tank, a second slow mixing tank, a second primary sedimentation tank, a comprehensive sludge concentration tank, an inorganic clean water tank, and a reused water system. The reused water system includes an ion exchanger, a second quartz sand filter, an activated carbon filter, a first pipeline mixer, a second pipeline mixer, a third pipeline mixer, a UF membrane system, a UF water production tank, a primary RO system, a primary RO water production tank, a secondary RO system, and a pure water production tank. The outlet of the inorganic wastewater regulating tank is connected to the second pH adjustment tank, the outlet of the second pH adjustment tank is connected to the second fast mixing tank, the outlet of the second fast mixing tank is connected to the second slow mixing tank, and the outlet of the second slow mixing tank is connected to the second primary sedimentation tank; one outlet of the second primary sedimentation tank is connected to the comprehensive sludge concentration tank, and the other outlet of the second primary sedimentation tank is connected to the inorganic clean water tank. an inlet of the inorganic clean water tank, another inlet of the inorganic clean water tank is connected to the ion exchanger in the nickel-containing wastewater system; the outlet of the inorganic clean water tank is connected to the second quartz sand filter, the outlet of the second quartz sand filter is connected to the activated carbon filter, the outlet of the activated carbon filter is connected to the UF membrane system through a pipeline, and the first pipeline mixer, the second pipeline mixer, and the third pipeline mixer are sequentially arranged on the pipeline; the outlet of the UF membrane system is connected to an inlet of the UF water production tank, and the other inlet of the UF water production tank is connected to the outlet of the MBR water production tank of the dyeing wastewater treatment system; the outlet of the UF water production tank is connected to the primary RO system; one outlet of the primary RO system is connected to the dyeing wastewater regulating tank of the dyeing wastewater treatment system, and the other outlet is connected to the secondary RO system; one outlet of the secondary RO system is connected back to the primary RO system by a pump, and the other outlet is connected to the pure water production tank;

[0064] The dyeing wastewater treatment system includes a dyeing wastewater regulating tank, a third pH adjustment tank, a Fenton reaction tank, a third pH correction tank, a fourth intermediate tank, a third reduction reaction tank, a third fast mixing tank, a third slow mixing tank, a third inclined tube sedimentation tank, a comprehensive sludge concentration tank, a third intermediate tank, and a biochemical system. The biochemical system includes an anaerobic tank, an anoxic tank, an aerobic tank, an MBR membrane tank, and an MBR water production tank. The outlet of the dyeing wastewater regulating tank is connected to the third pH adjustment tank, the outlet of the third pH adjustment tank is connected to the Fenton reaction tank, the outlet of the Fenton reaction tank is connected to the inlet of the third pH correction tank, and the other inlet of the third pH correction tank is connected to the outlet of the fourth intermediate tank of the phosphorus-containing wastewater treatment system. The outlet of the third pH correction tank is connected to the reduction reaction tank, and the outlet of the reduction reaction tank is connected to the third fast mixing tank. pool, the outlet of the third fast mixing pool is connected to the third slow mixing pool, the outlet of the third slow mixing pool is connected to the third inclined tube sedimentation pool; one outlet of the third inclined tube sedimentation pool is connected to the comprehensive sludge concentration pool, and the other outlet is connected to the third intermediate pool; the outlet of the third intermediate pool is connected to the anaerobic pool of the biochemical system, the outlet of the anaerobic pool is connected to the anoxic pool, the outlet of the anoxic pool is connected to the aerobic pool, one outlet of the aerobic pool is connected back to the anoxic pool by a pump, and the other outlet is connected to the MBR membrane pool; the MBR membrane pool is provided with an immersed ultrafiltration membrane assembly; one outlet of the MBR membrane pool is connected back to the anaerobic pool, the anoxic pool and the aerobic pool by a pump respectively, and the other outlet is connected to the MBR water production pool; one outlet of the MBR water production pool is connected to the UF water production pool of the inorganic wastewater treatment system, and the other outlet is connected to the discharge water pH adjustment pool of the discharge water system;

[0065] The discharge water treatment system includes a discharge water pH adjustment tank, a discharge water Fenton reaction tank, a discharge water pH correction tank, a discharge water reduction reaction tank, a discharge water fast mixing tank, a discharge water slow mixing tank, a discharge water sedimentation tank, a comprehensive sludge concentration tank, a discharge water intermediate tank, a discharge water aerated biological denitrification filter tank, a discharge water aerated biological nitrification filter tank, and a discharge water tank. The discharge water pH adjustment tank outlet is connected to the discharge water Fenton reaction tank, the discharge water Fenton reaction tank outlet is connected to the discharge water pH correction tank, and the discharge water pH correction tank outlet is connected to the discharge water reduction reaction tank. The outlet of the discharge water reduction reaction tank is connected to the discharge water fast mixing tank, the outlet of the discharge water fast mixing tank is connected to the discharge water slow mixing tank, the outlet of the discharge water slow mixing tank is connected to the discharge water sedimentation tank; one outlet of the discharge water sedimentation tank is connected to the comprehensive sludge concentration tank, the other outlet of the discharge water sedimentation tank is connected to the discharge water intermediate tank; the outlet of the discharge water intermediate tank is connected to the discharge water aerated biological denitrification filter, the outlet of the discharge water aerated biological denitrification filter is connected to the discharge water aerated biological nitrification filter, and the outlet of the discharge water aerated biological nitrification filter is connected to the discharge water pool;

[0066] The phosphorus-containing wastewater treatment system comprises a phosphorus-containing wastewater regulating tank, an air flotation device, a scum tank, a comprehensive sludge thickening tank, a 42nd pH adjustment tank, a 42nd phosphorus removal reaction tank, a 42nd slow mixing tank, a 41st primary sedimentation tank, a 43rd pH adjustment tank, a 41st fast mixing tank, a 43rd slow mixing tank, a second sedimentation tank, and a 41st intermediate tank. The air flotation device comprises a 41st pH adjustment tank, a 41st phosphorus removal reaction tank, a 41st slow mixing tank, and an air flotation tank. The outlet of the phosphorus-containing wastewater regulating tank is connected to the 41st pH adjustment tank of the air flotation device, the outlet of the 41st pH adjustment tank is connected to the 41st phosphorus removal reaction tank, the outlet of the 41st phosphorus removal reaction tank is connected to the air flotation tank, and the outlet of the air flotation tank is connected to the scum tank; the outlet of the scum tank is connected to the comprehensive sludge thickening tank. Another outlet is connected to the 42nd pH adjustment tank, the outlet of the 42nd pH adjustment tank is connected to the 42nd phosphorus removal reaction tank, the outlet of the 42nd phosphorus removal reaction tank is connected to the 42nd slow mixing tank, the outlet of the 42nd slow mixing tank is connected to the 41st primary sedimentation tank; one outlet of the 41st primary sedimentation tank is connected to the comprehensive sludge thickening tank, and the other outlet is connected to the 43rd pH adjustment tank; the outlet of the 43rd pH adjustment tank is connected to the 41st fast mixing tank, the outlet of the 41st fast mixing tank is connected to the 43rd slow mixing tank, and the outlet of the 43rd slow mixing tank is connected to the second sedimentation tank; one outlet of the second sedimentation tank is connected to the comprehensive sludge thickening tank, and the other outlet is connected to the 41st intermediate tank; the outlet of the 41st intermediate tank is connected to the 31st pH callback tank of the dyeing wastewater treatment system;

[0067] The outlet of the integrated sludge thickening tank connected to the inorganic wastewater treatment system, dyeing wastewater treatment system, discharge water system and phosphorus-containing wastewater treatment system is connected to the second chamber filter press by a pump, and the water outlet of the second chamber filter press is connected to the phosphorus-containing wastewater regulating tank.

[0068] Furthermore, in order to facilitate the control of pH value and pH accuracy and ensure the effect of acid-base neutralization, the first pH adjustment tank, the first and second pH adjustment tank, the intermediate clear water tank, the second pH adjustment tank, the first pipeline mixer, the third pH adjustment tank, the third pH correction tank, the discharge water pH adjustment tank, the discharge water pH correction tank, the fourth pH adjustment tank, the forty-second pH adjustment tank and the forty-third pH adjustment tank are all provided with pH online control devices.

[0069] Furthermore, in order to facilitate automatic control and detection of the redox potential value in the wastewater, the second pipeline mixer, the third reduction reaction tank, the discharge water callback tank, and the discharge water reduction reaction tank are all provided with an ORP online control device.

[0070] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 The present invention is a schematic diagram of the overall process of an anodizing wastewater treatment system.

[0072] Figure 2 It is a schematic diagram of the process of the nickel-containing wastewater treatment system in the present invention.

[0073] Figure 3 It is a schematic diagram of the process of the inorganic wastewater treatment system in the present invention.

[0074] Figure 4 It is a schematic diagram of the process of the dyeing wastewater treatment system in the present invention.

[0075] Figure 5 It is a schematic diagram of the flow of the discharged water treatment system in the present invention.

[0076] Figure 6 It is a schematic diagram of the process of the phosphorus-containing wastewater treatment system in the present invention. DETAILED DESCRIPTION

[0077] like Figure 1 A method and system for treating anodizing wastewater is shown, and the specific embodiments are as follows:

[0078] The wastewater generated by the anodizing production line is mainly divided into four categories: nickel-containing wastewater, inorganic wastewater, dyeing wastewater, and phosphorus-containing wastewater. These four types of wastewater need to be treated separately, discharged and reused in a unified manner.

[0079] Nickel-containing wastewater mainly comes from sealing waste liquid and post-cleaning nickel-containing wastewater. The main pollutants are nickel acetate, aluminum, COD, SS, etc.

[0080] like Figure 2 As shown, the treatment method of nickel-containing wastewater is:

[0081] Step 1a, after the nickel-containing wastewater discharged from the workshop is collected separately, the wastewater is discharged into a nickel-containing wastewater regulating tank to adjust the water quality and water quantity, and is pumped into a first pH adjustment tank by a lifting pump. In order to ensure the optimal pH of the flocculation reaction, NaOH is added to adjust the pH value to 9-11. The dosage of NaOH is automatically controlled by the pH online control device arranged in the first pH adjustment tank. The aeration, stirring and mixing reaction is carried out for 30 minutes, and the nickel ions in the wastewater and the hydroxide ions form nickel hydroxide precipitates and precipitate out;

[0082] Step 1b, discharge the wastewater into the first quick mixing tank, add the coagulant polyaluminium chloride PAC and aerate and stir for 30 minutes, the amount of PAC added is 500-800 mg / L, the aeration and stirring are fully mixed for 30 minutes, and the precipitated nickel hydroxide precipitate is coagulated into larger particles;

[0083] Step 1c, then discharge the wastewater into the first slow mixing tank, add the polymer flocculant PAM and mechanically stir for 30 minutes, the amount of PAM added is 5-8 mg / L, the mixing and stirring intensity controls the average velocity gradient G value to 30-60s-1, under the adsorption net capture effect of PAM, the particles in the water form large flocs;

[0084] Step 1d, discharging the sewage in the first slow mixing tank into the first primary sedimentation tank for gravity sedimentation, and the precipitated sludge enters the mud hopper of the first primary sedimentation tank, and is regularly discharged into the nickel-containing sludge concentration tank;

[0085] Step 1e, discharging the supernatant of the first primary sedimentation tank into the first second pH adjustment tank, adding NaOH again to adjust the pH value to 9-11 and aerating and stirring the reaction for 30 minutes, the amount of NaOH added is automatically controlled by the pH online control device set in the first second pH adjustment tank, and the nickel ions in the wastewater and the hydroxide ions form nickel hydroxide precipitates;

[0086] Step 1f, discharge the wastewater into the first and second quick mixing tanks, add coagulant polyaluminium chloride PAC and aerate and stir for 30 minutes, the amount of PAC added is 500-800 mg / L, the aeration and stirring are fully mixed for 30 minutes, and the precipitated nickel hydroxide precipitate is coagulated into larger particles;

[0087] Step 1g, discharge the wastewater from the first and second fast mixing tanks into the first and second slow mixing tanks, add a polymer flocculant PAM and mechanically stir for 30 minutes, the amount of PAM added is 5-8 mg / L, the mixing and stirring intensity controls the average velocity gradient G value to 30-60s-1, and under the adsorption and capture action of PAM, the particles in the water form large flocs;

[0088] Step 1h, discharge the wastewater from the first and second slow mixing tanks into the first inclined tube sedimentation tank for gravity sedimentation, the precipitated sludge enters the mud hopper of the first inclined tube sedimentation tank, and is regularly discharged into the nickel-containing sludge concentration tank, the sludge in the nickel-containing sludge concentration tank is filtered by the first chamber filter press, the dry sludge is transported out, and the filtrate is discharged into the nickel-containing wastewater regulating tank for further treatment;

[0089] Step 1i, discharge the supernatant of the first inclined tube sedimentation tank into the intermediate clear water tank, add sulfuric acid to the intermediate clear water tank to adjust the pH value to 6.5-7.5, the amount of sulfuric acid added is automatically controlled by the pH online control device set in the intermediate clear water tank, and the aeration and stirring reaction is carried out for 30 minutes. The wastewater of the intermediate clear water tank is pumped into the first quartz sand filter for treatment by a lifting pump, and if the nickel ion content of the first quartz sand filter is detected to be low, it is directly discharged into the inorganic clear water tank in the inorganic wastewater treatment system for further treatment; if the nickel ion content is detected to be high, the effluent is discharged into the inorganic clear water tank in the inorganic wastewater treatment system for further treatment after being treated by an ion exchanger, and the water in the inorganic clear water tank is pumped into the reuse water system for further treatment by a lifting pump.

[0090] Since the cleaning water source of inorganic wastewater is pure water, the organic matter content is low and it contains a small amount of aluminum.

[0091] like Figure 3 As shown, the treatment method of inorganic wastewater is:

[0092] Step 2a, the inorganic wastewater is collected separately and discharged into the inorganic wastewater regulating tank to adjust the water quality and water quantity, and the wastewater is pumped into the second pH adjustment tank by a lift pump. In order to ensure the optimal pH of the flocculation reaction, NaOH is added to adjust the pH value to 8.5-9. The dosage of NaOH is automatically controlled by the pH online control device set in the second pH adjustment tank, and the aeration and stirring reaction is carried out for 30 minutes, and the aluminum ions in the wastewater and the hydroxide ions form aluminum hydroxide precipitates.

[0093] Step 2b, discharge the wastewater from the second pH adjustment tank into the second fast mixing tank, add coagulant polyaluminium chloride PAC and aerate and stir for 30 minutes, the amount of PAC added ranges from 500 to 800 mg / L, and coagulate the precipitated precipitate into larger particles;

[0094] Step 2c, then discharge the wastewater into the second slow mixing tank, add the polymer flocculant PAM and mechanically stir for 30 minutes, the amount of PAM added is 5-8 mg / L, the mixing and stirring intensity controls the average velocity gradient G value to 30-60s-1, under the adsorption net capture effect of PAM, the particles in the water form large flocs;

[0095] Step 2d, the sewage in the second slow mixing tank is discharged into the second primary sedimentation tank for gravity sedimentation, the precipitated sludge enters the mud hopper of the second primary sedimentation tank, and is regularly discharged into the comprehensive sludge thickening tank. The sludge in the thickening tank is filtered by the second chamber filter press, and the dry sludge is transported out, and the filtrate is discharged into the phosphorus-containing wastewater regulating tank for further treatment;

[0096] Step 2e, discharge the supernatant of the second primary sedimentation tank into the inorganic clean water tank, pump the wastewater of the inorganic clean water tank into the second quartz sand filter of the reuse water system with a lift pump, and then treat it through the activated carbon filter. The wastewater filtered by the activated carbon filter is then discharged into the UF membrane system for treatment. In order to ensure the best pH for membrane treatment, the UF membrane system water inlet pipeline is provided with a first pipeline mixer for adding sulfuric acid to fully mix with the wastewater, a second pipeline mixer for adding reducing agent sodium bisulfite to fully mix with the wastewater, and a third pipeline mixer for adding scale inhibitors. The scale inhibitor can use LTLD-RO scale inhibitors, whose main components are organic dispersions, organic complexes, single-atom oxygen hydroxyl polymers, etc., and the addition amount is 3-5ppm, which is fully mixed with the wastewater to ensure the normal operation of the subsequent RO system, so that the pH value before the UF membrane system treatment reaches 6.5-7.5, and the reducing agent is adjusted to control the redox potential at ±150mv. The amount of sulfuric acid added is automatically controlled by the pH online control device set in the first pipeline mixer, and the amount of reducing agent added is automatically controlled by the ORP online control device set in the second pipeline mixer; after the wastewater is treated by the UF membrane system, the UF membrane effluent is discharged into the UF water production pool;

[0097] Step 2f, discharge the effluent from the UF water production pool into the primary RO system, the produced water of the primary RO system is discharged into the primary RO water production tank, and the concentrated water produced by the primary RO system is discharged into the dyeing wastewater regulating tank of the dyeing wastewater treatment system for further treatment; part of the water in the primary RO water production tank is reused as tap water, and part is discharged into the secondary RO system, the produced water of the secondary RO system enters the pure water production tank, the water in the pure water production tank is reused as pure water, and the concentrated water produced by the secondary RO system is returned to the primary RO system for re-treatment;

[0098] Dyeing wastewater mainly comes from dyeing waste liquid and cleaning wastewater after dyeing. The main pollutants in dyeing wastewater are COD, chromaticity and SS.

[0099] like Figure 4 , Figure 5 As shown, the treatment method of dyeing wastewater is:

[0100] Step 3a, collect the dyeing wastewater separately and then put it into the dyeing wastewater regulating tank. The function of the dyeing wastewater regulating tank is to receive the dyeing wastewater discharged from the production line and the concentrated water produced by the first-level RO. After fully adjusting the water quality and quantity, the wastewater is pumped into the third pH adjustment tank with a lift pump. In order to ensure the optimal pH of the subsequent Fenton reaction, sulfuric acid is added to the third pH adjustment tank to adjust the pH value to 3-4. The amount of sulfuric acid added is automatically controlled by the pH online control device set in the third pH adjustment tank. After 30 minutes of aeration and stirring reaction, the effluent is discharged into the Fenton reaction tank;

[0101] Step 3b, respectively adding H2O2 and FeSO4 to the Fenton reaction tank for Fenton reaction, the amount of H2O2 added is 100-200 mg / L, the amount of FeSO4 added is 200-300 mg / L, after aeration and stirring reaction for 1 hour, the effluent after the Fenton reaction is discharged into the third pH adjustment tank;

[0102] Step 3c, adding NaOH to the third pH adjustment tank to adjust the pH value to 7-8, the dosage of NaOH is automatically controlled by the pH online control device set in the third pH adjustment tank, and after aeration and stirring reaction for 30 minutes, the effluent is discharged into the third reduction reaction tank;

[0103] Step 3d, the function of the third reduction reaction tank is to reduce the excess oxidant and reduce the impact of the oxidant on the subsequent reaction. Add the reducing agent NaHSO3 to the third reduction reaction tank and mechanically stir the reaction for 30 minutes to control the redox potential at ±150mv. The dosage of the reducing agent is controlled by the ORP online control device set in the third reduction reaction tank. The mixing and stirring intensity controls the average velocity gradient G value of 30 to 60s-1, and then the effluent enters the third fast mixing tank;

[0104] Step 3e, adding a coagulant polyaluminium chloride (PAC) in the third fast mixing tank, wherein the amount of PAC added is 500-800 mg / L, aerating and stirring the reaction for 30 minutes, coagulating the suspended matter in the sewage into larger particles, and then discharging the sewage into the third slow mixing tank;

[0105] Step 3f, adding a polymer flocculant PAM in a third slow mixing tank, the amount of PAM added is 5-8 mg / L, and mechanically stirring for 30 minutes, the mixing and stirring intensity controls the average velocity gradient G value to 30-60s-1, and under the adsorption net capture effect, the particles in the water form large flocs;

[0106] Step 3g, the sewage from the third slow mixing tank is discharged into the third inclined tube sedimentation tank for gravity sedimentation, the precipitated sludge enters the mud hopper, and is regularly discharged into the comprehensive sludge thickening tank. The sludge in the thickening tank is filtered by the second chamber filter press, and the dry mud is transported out, and the filtrate is discharged into the phosphorus-containing wastewater regulating tank of the phosphorus-containing wastewater treatment system for further treatment;

[0107] Step 3h, discharge the supernatant of the third inclined tube sedimentation tank into the third intermediate tank, add sulfuric acid for aeration and stirring for 30 minutes, adjust the pH value to 6.5-7.5, and then discharge the effluent into the anaerobic tank in the biochemical system;

[0108] Step 3i, the biochemical system adopts AAO+MBR process, i.e., hydrolysis acidification+anoxic+aerobic+MBR process. The wastewater entering the biochemical system first enters the anaerobic tank for anaerobic reaction. The anaerobic tank is equipped with a submersible mixer to prevent sludge from depositing in the anaerobic tank. Subsequently, the anaerobic effluent is discharged into the anoxic tank for denitrification reaction. The anoxic tank is equipped with a submersible mixer to prevent sludge from depositing at the bottom and improve the denitrification efficiency. The effluent is then discharged into the aerobic tank for oxidation and nitrification reaction, and the mixed liquor in the aerobic tank is pumped back to the anoxic tank to continue the denitrification reaction. In order to improve the treatment effect of the biochemical system, the mixed liquor in the aerobic tank is returned to the anoxic tank at a reflux ratio of 100-400%.

[0109] Step 3j, the effluent from the aerobic pool is discharged into the MBR membrane pool and stays there for 30 to 60 minutes. In order to improve the membrane filtration efficiency and reduce the cost, the MBR membrane pool is provided with an immersed ultrafiltration membrane assembly. After the wastewater is filtered by the immersed ultrafiltration membrane assembly, it is pumped into the MBR water production pool, and the sludge is retained in the MBR membrane pool. The retained sludge is pumped back to the anaerobic pool, the anoxic pool and the aerobic pool; part of the water from the MBR water production pool is discharged into the UF water production pool of the inorganic wastewater treatment system for recycled water treatment, and the other part enters the discharge water pH adjustment pool of the discharge water system for further treatment;

[0110] Step 3k, adding sulfuric acid to the discharge water pH adjustment tank and aerating and stirring for 30 minutes, in order to ensure the optimal pH of the subsequent Fenton reaction, adjusting the pH value to 3-4, the addition amount of H2S04 is automatically controlled by the pH online control device set in the discharge water pH adjustment tank, and then the effluent is discharged into the discharge water Fenton reaction tank;

[0111] Step 31, H202 and FeSO4 are added to the discharge water Fenton reaction tank respectively for Fenton reaction and aerated and stirred for 1 hour, the amount of H202 added is 100-200 mg / L, the amount of FeSO4 added is 200-300 mg / L, and the effluent after the Fenton reaction is discharged into the discharge water pH adjustment tank;

[0112] Step 3m, adding NaOH to the discharge water pH adjustment tank and aerating and stirring the reaction for 30 minutes to adjust the pH value to 7-8, the dosage of NaOH is automatically controlled by the pH online control device set in the discharge water pH adjustment tank, and then the effluent is discharged into the discharge water reduction reaction tank;

[0113] Step 3n, the function of the discharge water reduction reaction tank is to carry out a reduction reaction on the excess oxidant to reduce the influence of the oxidant on the subsequent reaction. The reducing agent NaHSO3 is added to the discharge water reduction reaction tank and mechanically stirred to control the redox potential at ±150mv. The dosage of the reducing agent is automatically controlled by the ORP online control device set in the discharge water reduction reaction tank. The mixing and stirring intensity controls the average velocity gradient G value to 30 to 60s-1, and then the effluent is discharged into the discharge water fast mixing tank;

[0114] Step 3o, adding coagulant polyaluminium chloride (PAC) into the discharge water fast mixing tank and aerating and stirring for 30 minutes, the amount of PAC added is 500-800 mg / L, the suspended matter in the sewage is coagulated into larger particles, and then the sewage is discharged into the discharge water slow mixing tank;

[0115] Step 3p, adding a high molecular flocculant PAM to the discharge water slow mixing tank and mechanically stirring for 30 minutes, the amount of PAM added is 5-8 mg / L, the mixing and stirring intensity controls the average velocity gradient G value to 30-60s-1, the particles in the water form large flocs, and then the water is discharged into the discharge water sedimentation tank for gravity sedimentation, the precipitated sludge enters the mud hopper of the discharge water sedimentation tank, and is regularly discharged into the comprehensive sludge thickening tank. The sludge in the sludge thickening tank is filtered by the second chamber filter press, the dry sludge is transported out, and the filtrate is discharged into the phosphorus-containing wastewater regulating tank of the phosphorus-containing wastewater treatment system for further treatment;

[0116] Step 3q, the supernatant of the discharge water sedimentation tank is discharged into the discharge water intermediate tank, the main function of the discharge water intermediate tank is to transfer wastewater, and the wastewater in the discharge water intermediate tank is pumped into the discharge water aerated biological denitrification filter (discharge water BAF-DN tank) by a lift pump, the residence time is 3h, and then the effluent enters the discharge water aerated biological nitrification filter (discharge water BAF-CN tank), the residence time is 3h, after removing COD and denitrification, the effluent of the discharge water aerated biological nitrification filter enters the discharge water tank;

[0117] Step 3r, add NaOH or H2SO4 to the discharge water pool and aerate and stir to react for 30 minutes, adjust the pH value to 6-9, and the dosage of NaOH or H2S04 is automatically controlled by the pH online control device installed in the discharge water pool, and then the effluent meets the discharge standards.

[0118] Phosphorus-containing wastewater mainly comes from the cleaning wastewater after chemical disposal. The main pollutants in phosphorus-containing wastewater are COD, phosphorus, SS, etc.

[0119] like Figure 6 As shown, the treatment method of phosphorus-containing wastewater is:

[0120] Step 4a, the phosphorus-containing wastewater is collected separately and discharged into the phosphorus-containing wastewater regulating tank to adjust the water quality and water quantity, and then the wastewater in the phosphorus-containing wastewater regulating tank is pumped into the fourth pH adjustment tank in the flotation device by a lifting pump; the flotation device is provided with a fourth pH adjustment tank, a fourth phosphorus removal reaction tank, a fourth slow mixing tank and a flotation tank.

[0121] Step 4b, adding NaOH to the fourth pH adjustment tank and aerating and stirring for 30 minutes to adjust the pH value to 9-10, the dosage of NaOH is automatically controlled by the pH online control device set in the fourth pH adjustment tank, and then the effluent is discharged into the fourth phosphorus removal reaction tank in the flotation device;

[0122] Step 4c, adding a dephosphorizing agent to the fourth dephosphorization reaction tank and mixing and stirring for 30 minutes. In order to ensure the effect of the dephosphorization reaction and reduce the cost, the dephosphorizing agent added to the fourth dephosphorization reaction tank is FeSO4, and the addition amount is 80-100 mg / L. FeSO4 has both coagulation and dephosphorization functions. After the reaction, ferrous phosphate precipitates in the fourth dephosphorization reaction tank, and then the wastewater is discharged into the fourth slow mixing tank in the flotation device;

[0123] Step 4d, add high molecular flocculant PAM to the fourth slow mixing tank and stir mechanically for 30 minutes to carry out flocculation reaction. The amount of PAM added is 5-8 mg / L. The mixing and stirring intensity controls the average velocity gradient G value to 30-60s-1. Under the adsorption net capture effect of PAM, the particles in the water form large flocs, and then the wastewater is discharged into the flotation tank in the flotation device. The flotation adopts dissolved air flotation, and air is introduced into the water to produce fine bubbles, so that the fine phosphorus-containing suspended matter in the water adheres to the air bubbles and floats to the water surface with the bubbles to form scum. The scum is scraped to the scum tank with a scraper, and discharged into the comprehensive sludge thickening tank by gravity. The sludge in the comprehensive sludge thickening tank is filtered by the second chamber filter press, and the dry mud is transported out, and the filtrate flows into the phosphorus-containing wastewater regulating tank for further treatment, and the effluent of the flotation tank is discharged into the fourth second pH adjustment tank for further dephosphorization reaction;

[0124] Step 4e, in order to ensure the optimal pH of the phosphorus removal reaction, NaOH is added to the fourth second pH adjustment tank and aerated and stirred for 30 minutes to adjust the pH value to 9-10. The amount of NaOH added is automatically controlled by the pH online control device set in the fourth second pH adjustment tank, and then the effluent is discharged into the fourth second phosphorus removal reaction tank;

[0125] Step 4f, adding a dephosphorizing agent to the fourth second dephosphorization reaction tank. In order to ensure the effect of the dephosphorization reaction and reduce the cost, the dephosphorizing agent added to the fourth first dephosphorization reaction tank is FeSO4, and the added amount is 80-100 mg / L. FeSO4 has both coagulation and dephosphorization functions. After the reaction, ferrous phosphate precipitates in the fourth second dephosphorization reaction tank, and then the wastewater is discharged into the fourth second slow mixing tank;

[0126] Step 4g, adding a high molecular flocculant PAM to the fourth second slow mixing tank and mechanically stirring the reaction for 30 minutes to perform a flocculation reaction, the amount of PAM added is 5 to 8 mg / L, the mixing and stirring intensity controls the average velocity gradient G value to 30 to 60 s-1, and the particulate matter in the water forms large flocs, and then the wastewater is discharged into the fourth first primary sedimentation tank for gravity sedimentation, and the precipitated sludge enters the mud hopper of the fourth first primary sedimentation tank and is regularly discharged into the comprehensive sludge thickening tank. The sludge in the sludge thickening tank is filtered by the second chamber filter press, and the dry sludge is transported out, and the filtrate is discharged into the phosphorus-containing wastewater regulating tank of the phosphorus-containing wastewater treatment system for further treatment, and the supernatant of the fourth first primary sedimentation tank is discharged into the fourth third pH adjustment tank for further dephosphorization reaction;

[0127] Step 4h, in order to ensure the optimal pH of the flocculation reaction, NaOH is added to the fourth third pH adjustment tank and aerated and stirred for 30 minutes to adjust the pH to 9-10. The amount of NaOH added is automatically controlled by the pH online control device set in the fourth third pH adjustment tank, and then the wastewater is discharged into the fourth first fast mixing tank;

[0128] Step 4i, adding coagulant polyaluminium chloride PAC to the fourth first fast mixing tank and aerating and stirring for 30 minutes, the amount of PAC added is 500-800 mg / L, the precipitated precipitate is coagulated into larger particles, and then the wastewater is discharged into the fourth third slow mixing tank;

[0129] Step 4j, adding a high molecular flocculant PAM to the fourth slow mixing tank and mechanically stirring the reaction for 30 minutes, the amount of PAM added is 5-8 mg / L, the mixing and stirring intensity controls the average velocity gradient G value to 30-60s-1, the particles in the water form large flocs, and then the wastewater is discharged into the secondary sedimentation tank;

[0130] In step 4k, the flocs are gravity precipitated in the secondary sedimentation tank, and the precipitated sludge enters the sludge hopper of the secondary sedimentation tank and is regularly discharged into the comprehensive sludge thickening tank. The sludge in the comprehensive sludge thickening tank is filtered by the second chamber filter press, and the dry sludge is transported out. The filtrate is discharged into the phosphorus-containing wastewater regulating tank for further treatment, and the supernatant of the secondary sedimentation tank enters the fourth intermediate tank for transfer with a residence time of 1 hour. Then the wastewater of the fourth intermediate tank is pumped into the third pH callback tank of the dyeing wastewater treatment system by a lifting pump for treatment.

[0131] After being treated by the above-mentioned interrelated nickel-containing wastewater treatment system, inorganic wastewater treatment system, dyeing wastewater treatment system, discharge water system, and phosphorus-containing wastewater treatment system, the anodizing wastewater on the production line can be fully circulated and purified, and the purified water can be discharged or reused in compliance with the standards. At the same time, the dephosphorization agent FeSO4 added in the phosphorus-containing wastewater treatment step of the present invention has the effects of coagulation and dephosphorization at the same time, and will not cause the problem of calcium salt scaling in the produced water that affects subsequent membrane treatment, while also saving costs.

[0132] The above is an exemplary description of an anodizing wastewater treatment method and system of the present invention in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or they are directly applied to other occasions without improvement, they all fall within the protection scope of the present invention.

Claims

1. A method for treating anodizing wastewater, wherein the anodizing wastewater includes nickel-containing wastewater, inorganic wastewater, dyeing wastewater, and phosphorus-containing wastewater, characterized in that the steps for: (1) Treatment method of nickel-containing wastewater: (1a) discharging the nickel-containing wastewater into a nickel-containing wastewater regulating tank to adjust the water quality and quantity, and pumping the wastewater into a first pH adjustment tank, adding NaOH and aerating and stirring to adjust the pH value to 9 to 11, so that the nickel ions and hydroxide ions in the wastewater form nickel hydroxide precipitates and precipitate; (1b) Discharge the wastewater into the first rapid mixing tank, add polyaluminium chloride (PAC) as a coagulant and aerate and stir to coagulate the precipitated precipitate into larger particles; (1c) Then the wastewater is discharged into the first slow mixing tank, and the high molecular weight flocculant PAM is added for stirring, so that the particles in the water form large flocs; (1d) discharging the sewage in the first slow mixing tank into the first primary sedimentation tank for gravity sedimentation, and the precipitated sludge enters the sludge hopper and is regularly discharged into the nickel-containing sludge concentration tank; (1e) The supernatant of the first primary sedimentation tank is discharged into the first second pH adjustment tank, and NaOH is added again and aerated and stirred to adjust the pH value to 9-11, so that the nickel ions and hydroxide ions in the wastewater form nickel hydroxide precipitates; (1f) Discharge the wastewater into the first and second rapid mixing tanks, add polyaluminium chloride (PAC) as a coagulant and aerate and stir to coagulate the precipitated precipitate into larger particles; (1g) The wastewater from the first and second fast mixing tanks is discharged into the first and second slow mixing tanks, and a high molecular flocculant PAM is added for stirring. Under the adsorption and capture effect of the PAM, the particles in the water form large flocs; (1h) The wastewater from the first two slow mixing tanks is discharged into the first inclined tube sedimentation tank for gravity sedimentation, and the precipitated sludge enters the mud hopper and is regularly discharged into the nickel-containing sludge concentration tank. The sludge in the nickel-containing sludge concentration tank is filtered by the first chamber filter press, and the dry sludge is transported out, and the filtrate is discharged into the nickel-containing wastewater regulating tank for further treatment; (1i) discharging the supernatant of the first inclined tube sedimentation tank into the intermediate clear water tank, adding sulfuric acid to the intermediate clear water tank to adjust the pH value to 6.5-7.5 and aerate and stir, and then pumping the wastewater into the first quartz sand filter for treatment. If the nickel ion content of the effluent from the first quartz sand filter is low, it is directly discharged into the inorganic clear water tank in the inorganic wastewater treatment system; if the nickel ion content is high, the effluent is treated by an ion exchanger and then discharged into the inorganic clear water tank in the inorganic wastewater treatment system; (2) Treatment methods for inorganic wastewater: (2a) The inorganic wastewater is collected separately and discharged into an inorganic wastewater regulating tank to adjust the water quality and quantity, and then the wastewater is pumped into a second pH adjustment tank, and NaOH is added for aeration and stirring to adjust the pH value to 8.5-9, so that the aluminum ions in the wastewater react with the hydroxide ions to form aluminum hydroxide precipitates; (2b) Discharge the wastewater into the second rapid mixing tank, add polyaluminium chloride (PAC) as a coagulant and aerate and stir to coagulate the precipitated precipitate into larger particles; (2c) Then the wastewater is discharged into the second slow mixing tank, and the high molecular weight flocculant PAM is added for stirring, so that the particles in the water form large flocs; (2d) The sewage in the second slow mixing tank is discharged into the second primary sedimentation tank for gravity sedimentation. The precipitated sludge enters the sludge hopper and is regularly discharged into the comprehensive sludge thickening tank. The sludge in the comprehensive sludge thickening tank is filtered by the second chamber filter press, and the dry sludge is transported out, while the filtrate is discharged into the phosphorus wastewater regulating tank for treatment; (2e) The supernatant of the second primary sedimentation tank is discharged into the inorganic clean water tank, and the wastewater of the inorganic clean water tank is pumped into the second quartz sand filter of the reuse water system for treatment, and then treated by the activated carbon filter, and the filtered wastewater is discharged into the UF membrane system through a pipeline for treatment; sulfuric acid is added to the water inlet pipeline of the UF membrane system through the first pipeline mixer to adjust the pH value, and the reducing agent sodium bisulfite is added through the second pipeline mixer to adjust the redox potential, and the scale inhibitor is added through the third pipeline mixer to make the pH value of the water body reach 6.5-7.5 before the UF membrane system treatment, so that the redox potential is controlled at ±150mv; after the wastewater is treated by the UF membrane system, the effluent of the UF membrane system is discharged into the UF water production pool; (2f) The effluent from the UF water production pool is discharged into the primary RO system, the water produced by the primary RO system is discharged into the primary RO water production tank, and the concentrated water produced by the primary RO system is discharged into the dyeing wastewater regulating tank for treatment; Part of the water in the primary RO water production tank is reused as tap water, and part is discharged into the secondary RO system. The water produced by the secondary RO system enters the pure water production tank. The water in the pure water production tank is reused as pure water, and the concentrated water produced by the secondary RO system is returned to the primary RO system for reprocessing. (3) Treatment methods of dyeing wastewater: (3a) The dyeing wastewater is collected separately and then sent to the dyeing wastewater regulating tank to adjust the water quality and quantity, and then pumped into the third pH adjustment tank, sulfuric acid is added to adjust the pH value to 3-4 and aerated and stirred, and the effluent is discharged into the Fenton reaction tank; (3b) adding H2O2 and FeSO4 to the Fenton reaction tank respectively to carry out Fenton reaction and aerate and stir, and the effluent after the Fenton reaction is discharged into the third pH adjustment tank; (3c) NaOH is added to the third pH adjustment tank for aeration and stirring to adjust the pH value to 7-8, and the effluent is discharged into the third reduction reaction tank; (3d) adding a reducing agent NaHSO3 to the third reduction reaction tank and stirring to control the redox potential at ±150mv, and the effluent enters the third fast mixing tank; (3e) Adding coagulant polyaluminium chloride (PAC) into the third fast mixing tank and aerating and stirring to coagulate the suspended matter in the sewage into larger particles, and then discharging the sewage into the third slow mixing tank; (3f) Adding high molecular weight flocculant PAM into the third slow mixing tank and stirring, the particles in the water form large flocs; (3g) The sewage from the third slow mixing tank is discharged into the third inclined tube sedimentation tank for gravity sedimentation. The precipitated sludge enters the sludge hopper and is regularly discharged into the comprehensive sludge thickening tank. The sludge in the thickening tank is filtered by the second chamber filter press, and the dry sludge is transported out, while the filtrate is discharged into the phosphorus wastewater regulating tank for further treatment; (3h) The supernatant of the third inclined tube sedimentation tank is discharged into the third intermediate tank, and sulfuric acid is added for aeration and stirring to adjust the pH value to 6.5-7.5, and then the effluent is discharged into the anaerobic tank in the biochemical system; (3i) subjecting the wastewater from the anaerobic tank to anaerobic reaction and stirring, then discharging the anaerobic effluent into the anoxic tank for denitrification reaction and stirring, then discharging the effluent into the aerobic tank for oxidation and nitrification reaction, and then pumping the mixed solution from the aerobic tank back to the anoxic tank for further denitrification reaction; (3j) The effluent from the aerobic pool is discharged into the MBR membrane pool. After the wastewater is filtered through the ultrafiltration membrane assembly, it is pumped into the MBR water production pool. The sludge is retained in the MBR membrane pool. The retained sludge is pumped back to the anaerobic pool, the anoxic pool and the aerobic pool. Part of the water from the MBR water production pool is discharged into the UF water production pool of the inorganic wastewater treatment system for reuse water treatment, and the other part enters the discharge water pH adjustment pool of the discharge water system for further treatment. (3k) Add sulfuric acid to the discharge water pH adjustment tank and aerate and stir to adjust the pH value to 3-4, and discharge the effluent into the discharge water Fenton reaction tank; (3l) H2O2 and FeSO4 are added to the discharge water Fenton reaction tank to perform Fenton reaction and aerate and stir, and the effluent after the Fenton reaction enters the discharge water pH adjustment tank; (3m) Add NaOH to the discharge water pH adjustment tank and aerate and stir to adjust the pH value to 7-8, and then the effluent enters the discharge water reduction reaction tank; (3n) Add reducing agent NaHSO3 to the discharge water reduction reaction tank and stir to control the redox potential at ±150mV, and the effluent enters the discharge water fast mixing tank; (3o) Adding coagulant polyaluminium chloride (PAC) to the discharge water fast mixing tank and aerating and stirring to coagulate the suspended matter in the sewage into larger particles, which are then discharged into the discharge water slow mixing tank; (3p) Add high molecular weight flocculant PAM to the discharge water slow mixing tank and stir it, so that the particles in the water form large flocs, and then discharge the water into the discharge water sedimentation tank for gravity sedimentation. The precipitated sludge enters the mud hopper and is regularly discharged into the comprehensive sludge thickening tank. The sludge in the sludge thickening tank is filtered by the second chamber filter press and then the dry sludge is transported out, while the filtrate is discharged into the phosphorus wastewater regulating tank for further treatment; (3q) discharging the supernatant of the drainage water sedimentation tank into the drainage water intermediate tank, and lifting the wastewater in the drainage water intermediate tank to the drainage water aerated biological denitrification filter tank, and then the effluent enters the drainage water aerated biological nitrification filter tank, and then the effluent of the drainage water aerated biological nitrification filter tank enters the drainage water tank; (3r) Add NaOH or H2SO4 to the discharge water pool and stir it with aeration to adjust the pH value to 6-9 so that the effluent meets the discharge standards; (4) Treatment methods for phosphorus-containing wastewater: (4a) The phosphorus-containing wastewater is collected separately and discharged into a phosphorus-containing wastewater regulating tank to adjust the water quality and quantity, and then the wastewater in the phosphorus-containing wastewater regulating tank is pumped into the fourth pH adjustment tank in the flotation device; (4b) NaOH is added to the fourth pH adjustment tank and aerated and stirred to adjust the pH value to 9-10, and then the effluent is discharged into the fourth phosphorus removal reaction tank in the flotation device; (4c) adding 80-100 mg / L of dephosphorization agent FeSO4 to the fourth dephosphorization reaction tank for stirring and reaction, and then discharging the wastewater into the fourth slow mixing tank in the flotation device; (4d) Adding a high molecular weight flocculant PAM to the fourth slow mixing tank and stirring to perform a flocculation reaction, the particles in the water form large flocs, and then discharging the wastewater into the flotation tank in the flotation device, the flocs form scum, the scum is scraped into the scum tank, and discharged into the comprehensive sludge thickening tank by gravity sludge discharge, the sludge in the comprehensive sludge thickening tank is filtered by the second chamber filter press, the dry sludge is transported out, the filtrate flows into the phosphorus-containing wastewater regulating tank for further treatment, and the drainage from the flotation tank enters the fourth second pH adjustment tank for further phosphorus removal reaction; (4e) adding NaOH to the fourth second pH adjustment tank and aerating and stirring to adjust the pH value to 9-10, and then discharging the effluent into the fourth second phosphorus removal reaction tank; (4f) adding 80-100 mg / L of dephosphorization agent FeSO4 to the fourth second dephosphorization reaction tank for stirring and reaction, and then discharging the wastewater into the fourth second slow mixing tank; (4g) Adding a high molecular weight flocculant PAM to the fourth second slow mixing tank and mechanically stirring the tank to perform a flocculation reaction, so that the particles in the water form large flocs, and then discharging the wastewater into the fourth first primary sedimentation tank for gravity sedimentation. The precipitated sludge enters the sludge hopper and is regularly discharged into the comprehensive sludge thickening tank. The sludge in the sludge thickening tank is filtered by the second chamber filter press, and the dry sludge is transported out. The filtrate is discharged into the phosphorus-containing wastewater regulating tank for further treatment, and the supernatant of the fourth first primary sedimentation tank is discharged into the fourth third pH adjustment tank for further phosphorus removal reaction; (4h) Adding NaOH to the fourth pH adjustment tank and aerating and stirring to adjust the pH to 9-10, and then discharge the wastewater into the fourth quick mixing tank; (4i) Adding coagulant polyaluminium chloride (PAC) into the fourth fast mixing tank and aerating and stirring, the precipitated precipitate is coagulated into larger particles, and then the wastewater is discharged into the fourth slow mixing tank; (4j) Adding high molecular weight flocculant PAM into the fourth slow mixing tank and stirring, the particles in the water form large flocs, and then discharge the wastewater into the secondary sedimentation tank; (4k) The flocs are gravity precipitated in the secondary sedimentation tank, and the precipitated sludge enters the sludge hopper and is regularly discharged into the comprehensive sludge thickening tank. The sludge in the comprehensive sludge thickening tank is filtered by the second chamber filter press, and the dry sludge is transported out. The filtrate is discharged into the phosphorus-containing wastewater regulating tank for further treatment, while the supernatant of the secondary sedimentation tank is discharged into the fourth intermediate tank for transfer. The wastewater of the fourth intermediate tank is then pumped into the third pH adjustment tank of the dyeing wastewater treatment system for further treatment.

2. The method for treating anodizing wastewater according to claim 1, characterized in that: In steps (1b) and (1f) of the method for treating nickel-containing wastewater, step (2b) of the method for treating inorganic wastewater, steps (3e) and (3o) of the method for treating dyeing wastewater, and step (4i) of the method for treating phosphorus-containing wastewater, the amount of coagulant polyaluminium chloride (PAC) added each time is 500 to 800 mg / L, and the stirring and mixing reaction time is 30 minutes.

3. The method for treating anodizing wastewater according to claim 1, wherein In steps (1c) and (1g) of the nickel-containing wastewater treatment method, step (2c) of the inorganic wastewater treatment method, steps (3f) and (3p) of the dyeing wastewater treatment method, and steps (4d), (4g) and (4j) of the phosphorus-containing wastewater treatment method, the amount of polymer flocculant PAM added each time is 5 to 8 mg / L, the stirring and mixing reaction time is 30 minutes, and the stirring and mixing intensity controls the average speed gradient G value to be 30 to 60 seconds. -1 .

4. The method for treating anodizing wastewater according to claim 1, wherein The amount of H2O2 added to the Fenton reaction tank is 100-200 mg / L, the amount of FeSO4 added is 200-300 mg / L, and the stirring and mixing reaction time is 1 hour.

5. The method for treating anodizing wastewater according to claim 1, characterized in that: The mixed liquid in the aerobic pool is returned to the anoxic pool at a return ratio of 100-400%.

6. The method for treating anodizing wastewater according to claim 1, characterized in that: The scale inhibitor added to the third pipeline mixer is LTLD-RO scale inhibitor, and the added amount is 3-5 ppm.

7. An anodizing wastewater treatment system for implementing the method of claim 1, comprising associated nickel-containing wastewater treatment systems, inorganic wastewater treatment systems, dyeing wastewater treatment systems, drainage water systems, and phosphorus-containing wastewater treatment systems, The nickel-containing wastewater treatment system comprises a nickel-containing wastewater regulating tank, a first pH adjustment tank, a first fast mixing tank, a first slow mixing tank, a first primary sedimentation tank, a nickel-containing sludge thickening tank, a first chamber filter press, a first second pH adjustment tank, a first second fast mixing tank, a first second slow mixing tank, a first inclined tube sedimentation tank, an intermediate clear water tank, a first quartz sand filter, and an ion exchanger. The outlet of the nickel-containing wastewater regulating tank is connected to the first pH adjustment tank, the outlet of the first pH adjustment tank is connected to the first fast mixing tank, the outlet of the first fast mixing tank is connected to the first slow mixing tank, and the outlet of the first slow mixing tank is connected to the first primary sedimentation tank; the outlet of the first primary sedimentation tank is connected to the nickel-containing sludge thickening tank, and the nickel-containing sludge thickening tank The outlet of the pool is connected to the first chamber filter press by a pump, and the other outlet of the first primary sedimentation tank is connected to the first second pH adjustment tank; the outlets of the first second pH adjustment tank are connected to the first second fast mixing tanks, the outlets of the first second fast mixing tanks are connected to the first second slow mixing tanks, and the outlets of the first second slow mixing tanks are connected to the first first inclined tube sedimentation tank; one outlet of the first first inclined tube sedimentation tank is connected to the nickel-containing sludge concentration tank, and the other outlet is connected to the intermediate clear water tank; the outlet of the intermediate clear water tank is connected to the first first quartz sand filter; one outlet of the first first quartz sand filter is connected to the inorganic clear water tank in the inorganic wastewater treatment system, and the other outlet is connected to the ion exchanger; the outlet of the ion exchanger is connected to the inorganic clear water tank of the inorganic wastewater treatment system; The inorganic wastewater treatment system includes an inorganic wastewater regulating tank, a second pH adjustment tank, a second fast mixing tank, a second slow mixing tank, a second primary sedimentation tank, a comprehensive sludge concentration tank, an inorganic clean water tank, and a reused water system. The reused water system includes an ion exchanger, a second quartz sand filter, an activated carbon filter, a first pipeline mixer, a second pipeline mixer, a third pipeline mixer, a UF membrane system, a UF water production tank, a primary RO system, a primary RO water production tank, a secondary RO system, and a pure water production tank. The outlet of the inorganic wastewater regulating tank is connected to the second pH adjustment tank, the outlet of the second pH adjustment tank is connected to the second fast mixing tank, the outlet of the second fast mixing tank is connected to the second slow mixing tank, and the outlet of the second slow mixing tank is connected to the second primary sedimentation tank; one outlet of the second primary sedimentation tank is connected to the comprehensive sludge concentration tank, and the other outlet of the second primary sedimentation tank is connected to the inorganic clean water tank. an inlet of the inorganic clean water tank, another inlet of the inorganic clean water tank is connected to the ion exchanger in the nickel-containing wastewater system; the outlet of the inorganic clean water tank is connected to the second quartz sand filter, the outlet of the second quartz sand filter is connected to the activated carbon filter, the outlet of the activated carbon filter is connected to the UF membrane system through a pipeline, and the first pipeline mixer, the second pipeline mixer, and the third pipeline mixer are sequentially arranged on the pipeline; the outlet of the UF membrane system is connected to an inlet of the UF water production tank, and the other inlet of the UF water production tank is connected to the outlet of the MBR water production tank of the dyeing wastewater treatment system; the outlet of the UF water production tank is connected to the primary RO system; one outlet of the primary RO system is connected to the dyeing wastewater regulating tank of the dyeing wastewater treatment system, and the other outlet is connected to the secondary RO system; one outlet of the secondary RO system is connected back to the primary RO system by a pump, and the other outlet is connected to the pure water production tank; The dyeing wastewater treatment system includes a dyeing wastewater regulating tank, a third pH adjustment tank, a Fenton reaction tank, a third pH correction tank, a fourth intermediate tank, a third reduction reaction tank, a third fast mixing tank, a third slow mixing tank, a third inclined tube sedimentation tank, a comprehensive sludge concentration tank, a third intermediate tank, and a biochemical system. The biochemical system includes an anaerobic tank, an anoxic tank, an aerobic tank, an MBR membrane tank, and an MBR water production tank. The outlet of the dyeing wastewater regulating tank is connected to the third pH adjustment tank, the outlet of the third pH adjustment tank is connected to the Fenton reaction tank, the outlet of the Fenton reaction tank is connected to the inlet of the third pH correction tank, and the other inlet of the third pH correction tank is connected to the outlet of the fourth intermediate tank of the phosphorus-containing wastewater treatment system. The outlet of the third pH correction tank is connected to the reduction reaction tank, and the outlet of the reduction reaction tank is connected to the third fast mixing tank. pool, the outlet of the third fast mixing pool is connected to the third slow mixing pool, the outlet of the third slow mixing pool is connected to the third inclined tube sedimentation pool; one outlet of the third inclined tube sedimentation pool is connected to the comprehensive sludge concentration pool, and the other outlet is connected to the third intermediate pool; the outlet of the third intermediate pool is connected to the anaerobic pool of the biochemical system, the outlet of the anaerobic pool is connected to the anoxic pool, the outlet of the anoxic pool is connected to the aerobic pool, one outlet of the aerobic pool is connected back to the anoxic pool by a pump, and the other outlet is connected to the MBR membrane pool; the MBR membrane pool is provided with an immersed ultrafiltration membrane assembly; one outlet of the MBR membrane pool is connected back to the anaerobic pool, the anoxic pool and the aerobic pool by a pump respectively, and the other outlet is connected to the MBR water production pool; one outlet of the MBR water production pool is connected to the UF water production pool of the inorganic wastewater treatment system, and the other outlet is connected to the discharge water pH adjustment pool of the discharge water system; The discharge water treatment system comprises a discharge water pH adjustment tank, a discharge water Fenton reaction tank, a discharge water pH correction tank, a discharge water reduction reaction tank, a discharge water fast mixing tank, a discharge water slow mixing tank, a discharge water sedimentation tank, a comprehensive sludge concentration tank, a discharge water intermediate tank, a discharge water aerated biological denitrification filter tank, a discharge water aerated biological nitrification filter tank, and a discharge water tank. The outlet of the discharge water pH adjustment tank is connected to the discharge water Fenton reaction tank, the outlet of the discharge water Fenton reaction tank is connected to the discharge water pH correction tank, and the outlet of the discharge water pH correction tank is connected to the discharge water reduction reaction tank. The outlet of the discharge water reduction reaction tank is connected to the discharge water fast mixing tank, the outlet of the discharge water fast mixing tank is connected to the discharge water slow mixing tank, the outlet of the discharge water slow mixing tank is connected to the discharge water sedimentation tank; one outlet of the discharge water sedimentation tank is connected to the comprehensive sludge concentration tank, the other outlet of the discharge water sedimentation tank is connected to the discharge water intermediate tank; the outlet of the discharge water intermediate tank is connected to the discharge water aerated biological denitrification filter, the outlet of the discharge water aerated biological denitrification filter is connected to the discharge water aerated biological nitrification filter, and the outlet of the discharge water aerated biological nitrification filter is connected to the discharge water pool; The phosphorus-containing wastewater treatment system comprises a phosphorus-containing wastewater regulating tank, an air flotation device, a scum tank, a comprehensive sludge thickening tank, a 42nd pH adjustment tank, a 42nd phosphorus removal reaction tank, a 42nd slow mixing tank, a 41st primary sedimentation tank, a 43rd pH adjustment tank, a 41st fast mixing tank, a 43rd slow mixing tank, a second sedimentation tank, and a 41st intermediate tank. The air flotation device comprises a 41st pH adjustment tank, a 41st phosphorus removal reaction tank, a 41st slow mixing tank, and an air flotation tank. The outlet of the phosphorus-containing wastewater regulating tank is connected to the 41st pH adjustment tank of the air flotation device, the outlet of the 41st pH adjustment tank is connected to the 41st phosphorus removal reaction tank, the outlet of the 41st phosphorus removal reaction tank is connected to the air flotation tank, and the outlet of the air flotation tank is connected to the scum tank; the outlet of the scum tank is connected to the comprehensive sludge thickening tank. Another outlet is connected to the 42nd pH adjustment tank, the outlet of the 42nd pH adjustment tank is connected to the 42nd phosphorus removal reaction tank, the outlet of the 42nd phosphorus removal reaction tank is connected to the 42nd slow mixing tank, the outlet of the 42nd slow mixing tank is connected to the 41st primary sedimentation tank; one outlet of the 41st primary sedimentation tank is connected to the comprehensive sludge thickening tank, and the other outlet is connected to the 43rd pH adjustment tank; the outlet of the 43rd pH adjustment tank is connected to the 41st fast mixing tank, the outlet of the 41st fast mixing tank is connected to the 43rd slow mixing tank, and the outlet of the 43rd slow mixing tank is connected to the second sedimentation tank; one outlet of the second sedimentation tank is connected to the comprehensive sludge thickening tank, and the other outlet is connected to the 41st intermediate tank; the outlet of the 41st intermediate tank is connected to the 31st pH callback tank of the dyeing wastewater treatment system; The outlet of the integrated sludge thickening tank connected to the inorganic wastewater treatment system, dyeing wastewater treatment system, discharge water system and phosphorus-containing wastewater treatment system is connected to the second chamber filter press by a pump, and the water outlet of the second chamber filter press is connected to the phosphorus-containing wastewater regulating tank.

8. The anodizing wastewater treatment system according to claim 7, characterized in that: The first pH adjustment tank, the first second pH adjustment tank, the intermediate clear water tank, the second pH adjustment tank, the first pipeline mixer, the third pH adjustment tank, the third pH correction tank, the discharge water pH adjustment tank, the discharge water pH correction tank, the fourth pH adjustment tank, the forty-second pH adjustment tank, and the forty-third pH adjustment tank are all provided with pH online control devices.

9. The anodizing wastewater treatment system according to claim 7, characterized in that: The second pipeline mixer, the third reduction reaction tank, the discharge water callback tank and the discharge water reduction reaction tank are all provided with ORP online control devices.

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