Electroplating sewage treatment device
By designing an electroplating wastewater treatment device, harmful substances in the electroplating wastewater are separated using physical and chemical methods, solving the problem of electroplating wastewater treatment and achieving efficient and compliant discharge.
Patent Information
- Application Number
- CN202422904029.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-26
AI Technical Summary
Electroplating wastewater has a complex composition and contains heavy metal ions, making it difficult to achieve effective treatment and meet discharge standards with existing technologies.
An electroplating wastewater treatment device was designed, including components such as an oil-water separator sedimentation tank, a coagulation flotation tank, an anoxic tank, an aerobic tank, and a secondary sedimentation tank. The device separates and degrades harmful substances in the wastewater through physical and chemical methods, forming stable precipitates and recovering sludge.
It achieves highly efficient removal of Cr6+, total Cr, SS, CODcr, BOD5 and petroleum substances from electroplating wastewater, with a treatment efficiency of over 90%, meeting emission standards.
Smart Images
Figure CN223496328U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to an electroplating wastewater treatment device. Background Technology
[0002] Electroplating wastewater is often mixed with domestic sewage and industrial wastewater, making its composition more complex and its treatment more difficult. It generally includes oily wastewater, post-plating wastewater, domestic sewage, and other wastewater. The quality and quantity of electroplating wastewater are related to factors such as the electroplating process conditions, production load, operation management, and water usage. Electroplating wastewater is complex in quality and its composition is difficult to control. It contains heavy metal ions such as chromium, which pose a potential threat to the environment and human health. The high concentrations of various pollutants in electroplating wastewater can have a significant impact on the surrounding environment if left untreated.
[0003] With increasing environmental awareness, the discharge standards for electroplating wastewater are becoming increasingly stringent, requiring not only the removal of harmful substances during treatment but also compliance with relevant emission standards. Currently, electroplating wastewater is generally treated using physicochemical methods, and while there are many methods available, few achieve complete compliance. New treatment technologies are constantly emerging, but each technology has its advantages, disadvantages, and application scope. Only by selecting appropriate structures for combined treatment can the desired treatment effect be achieved. Utility Model Content
[0004] In view of this, the technical problem to be solved by this utility model is to provide an electroplating wastewater treatment device to effectively treat electroplating wastewater and achieve the standard discharge of wastewater.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0006] An electroplating wastewater treatment device includes: an oily wastewater pipe, a post-plating wastewater pipe, a domestic sewage pipe, and other wastewater pipes connected to an electroplating production line. The oily wastewater pipe is sequentially connected to an oil-water separation sedimentation tank, a pretreatment equalization tank, a coagulation and flotation tank, a comprehensive equalization tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank, and a clear water tank. The post-plating wastewater pipe is connected to a reaction sedimentation tank, which is connected to the inlet of the pretreatment equalization tank. The domestic sewage pipe is connected to a bar screen, which is connected to the inlet of the comprehensive equalization tank. The other wastewater pipes are connected to the inlet of the pretreatment equalization tank.
[0007] Optionally, the oil-water separator is equipped with inclined tube packing in the middle, an oil floating collection device at the top, and a sludge hopper at the bottom, and is connected to a waste oil tank.
[0008] Optionally, the coagulation flotation tank includes a primary coagulation flotation tank and a secondary coagulation flotation tank. The inlet of the primary coagulation flotation tank is connected to the outlet of the pretreatment equalization tank, the outlet of the primary coagulation flotation tank is connected to the inlet of the secondary coagulation flotation tank, and the outlet of the secondary coagulation flotation tank is connected to the inlet of the integrated equalization tank.
[0009] Optionally, the primary coagulation flotation tank and the secondary coagulation flotation tank are respectively connected to a dosing device.
[0010] Optionally, the reaction sedimentation tank is connected to a dosing device.
[0011] Optionally, a nitrification liquid return pipe is provided between the aerobic tank and the anoxic tank, and a sludge return pipe is provided between the secondary sedimentation tank and the anoxic tank.
[0012] Optionally, the primary coagulation flotation tank, the secondary coagulation flotation tank, and the secondary sedimentation tank are each connected to a sludge discharge pipe, the sludge discharge pipe is connected to a sludge thickening tank, and the sludge thickening tank is connected to a screw press.
[0013] Optionally, the supernatant from the sludge thickening tank and the leachate from the screw press are respectively connected to the pretreatment equalization tank.
[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0015] This utility model provides an electroplating wastewater treatment device based on the above technical solution, which comprehensively treats oily wastewater, post-plating wastewater, domestic sewage, and other wastewater generated during electroplating, and reduces the Cr content in the treated wastewater. 6+ Total Cr, SS, COD cr The content of BOD5 and petroleum hydrocarbons all meet the relevant standards, and the overall treatment efficiency is higher than 90%. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 : A schematic diagram of the structure of an electroplating wastewater treatment device according to this utility model;
[0018] The components include: 1. Oil-water separator sedimentation tank; 2. Pretreatment equalization tank; 3. Primary coagulation and flotation tank; 4. Secondary coagulation and flotation tank; 5. Integrated equalization tank; 6. Anoxic tank; 7. Aerobic tank; 8. Secondary sedimentation tank; 9. Clear water tank; 10. Reaction sedimentation tank; 11. Grille well; 12. Waste oil tank; 13. Dosing equipment; 14. Sludge thickening tank; and 15. Screw press. Detailed Implementation
[0019] To better understand this utility model, the following embodiments further illustrate its content, but the scope of protection of this utility model is not limited to the embodiments described below. Numerous specific details are set forth in the following description to provide a more thorough understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without one or more of these details.
[0020] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and should not be construed as limiting this utility model.
[0022] like Figure 1 As shown, an electroplating wastewater treatment device includes: an oily wastewater pipe, a post-plating wastewater pipe, a domestic sewage pipe, and other wastewater pipes connected to the electroplating production line. The oily wastewater pipe is sequentially connected to an oil-water separation sedimentation tank 1, a pretreatment equalization tank 2, a coagulation flotation tank, a comprehensive equalization tank 5, an anoxic tank 6, an aerobic tank 7, a secondary sedimentation tank 8, and a clear water tank 9. The post-plating wastewater pipe is connected to a reaction sedimentation tank 10, which is connected to the inlet of the pretreatment equalization tank 2. The domestic sewage pipe is connected to a bar screen well 11, which is connected to the inlet of the comprehensive equalization tank 5. The other wastewater pipes are connected to the inlet of the pretreatment equalization tank 2.
[0023] In some specific embodiments of this utility model, the oil-sedimentation tank 1 is connected to the waste oil tank 12.
[0024] In some specific embodiments of this utility model, the coagulation flotation tank includes a primary coagulation flotation tank 3 and a secondary coagulation flotation tank 4. The inlet of the primary coagulation flotation tank 3 is connected to the outlet of the pretreatment equalization tank 2, the outlet of the primary coagulation flotation tank 3 is connected to the inlet of the secondary coagulation flotation tank 4, and the outlet of the secondary coagulation flotation tank 4 is connected to the inlet of the comprehensive equalization tank 5.
[0025] In some specific embodiments of this utility model, the primary coagulation flotation tank 3 and the secondary coagulation flotation tank 4 are respectively connected to the dosing equipment 13.
[0026] In some specific embodiments of this utility model, the reaction sedimentation tank 10 is connected to the dosing equipment 13.
[0027] In some specific embodiments of this utility model, a nitrification liquid return pipe is provided between the aerobic tank 7 and the anoxic tank 6, and a sludge return pipe is provided between the secondary sedimentation tank 8 and the anoxic tank 6.
[0028] In some specific embodiments of this utility model, the primary coagulation flotation tank 3, the secondary coagulation flotation tank 4, and the secondary sedimentation tank 8 are respectively connected to sludge discharge pipes, which are connected to sludge thickening tank 14, and sludge thickening tank 14 is connected to screw press 15.
[0029] In some specific embodiments of this utility model, the supernatant of the sludge thickening tank 14 and the leachate removed by the screw press 15 are respectively connected to the pretreatment equalization tank 2.
[0030] Based on the above-mentioned electroplating wastewater treatment device, oily wastewater is collected and enters the oil-water separation sedimentation tank 1. The oil-water separation sedimentation tank 1 is equipped with inclined tube packing in the middle and a floating oil collection device at the top. Surface oil is skimmed off and enters the waste oil tank 12, while sludge settles into the bottom sludge hopper. The wastewater is then separated and enters the pretreatment equalization tank 2. Chromium-containing wastewater after plating is collected and enters the reaction sedimentation tank 10. The pH value is adjusted to 2-3 in the tank, and then the reducing agent NaHSO3 is added to reduce hexavalent chromium to trivalent chromium. NaOH is added to adjust the pH value to around 9.5, forming a metal hydroxide precipitate. FeCl3 coagulant is added to increase the precipitate particle size. Finally, PAM coagulant aid is added to form large-particle flocculent precipitates, which are then removed from the wastewater. The effluent from the reaction sedimentation tank 10 enters the pretreatment equalization tank 2. Other wastewater is collected and enters the pretreatment equalization tank 2, where the water volume and quality are adjusted and homogenized.
[0031] The effluent from pretreatment equalization tank 2 is pumped into primary coagulation flotation tank 3. Flocculants are added to generate colloidal particles, and impurities float to the surface under the action of microbubbles, where they are removed by a scraper. The effluent from primary coagulation flotation tank 3 then enters secondary coagulation flotation tank 4 for further removal of oil and suspended solids. Domestic sewage is collected and enters screen well 11 to remove floating debris, large suspended solids, and other impurities before entering integrated equalization tank 5. The effluent from secondary coagulation flotation tank 4 then enters integrated equalization tank 5. In integrated equalization tank 5, the sewage volume and quality are adjusted before being pumped into anoxic tank 6. The effluent from anoxic tank 6 enters aerobic tank 7. The anoxic (A) tank and aerobic (O) tank together form an A / O tank. A nitrification liquid return system is installed from aerobic tank 7 to the upstream anoxic tank 6. Aerobic tank 7, through aeration, converts non-nitrate nitrogen in the sewage into nitrite and nitrate nitrogen, while simultaneously removing a large amount of organic matter. The mixed liquor containing nitrite and nitrate nitrogen is returned to the anoxic tank 6 via a return pump. Denitrification occurs in the anoxic zone, reducing most of the nitrite and nitrate nitrogen to nitrogen gas, which then escapes from the wastewater. The effluent from the aerobic tank 7 enters the secondary sedimentation tank 8. Sludge from the secondary sedimentation tank 8 is returned to the anoxic tank 6. The effluent from the secondary sedimentation tank 8 enters the clear water tank 9, and the effluent from the clear water tank 9 is discharged after meeting emission standards.
[0032] Part of the sludge produced in the secondary sedimentation tank 8 is returned to the anoxic tank 6, and the remaining sludge is discharged into the sludge thickening tank 14 for temporary storage. The sludge and scum produced in the oil-water separation sedimentation tank 1 and the scum produced in the air flotation tank are also discharged into the sludge thickening tank 14. The thickened sludge enters the screw press 15 for dewatering, and the dewatered sludge is transported off-site for treatment.
[0033] The supernatant from sludge thickening tank 14 and the leachate from screw press 15 are returned to pretreatment equalization tank 2 and re-enter the system for treatment.
[0034] This utility model of electroplating wastewater treatment device is used for wastewater treatment in an electroplating production line of a certain enterprise. The influent (unit: mg / L), effluent (unit: mg / L), and removal rate of each structure were measured, and the results are shown in the table below:
[0035]
[0036]
[0037] The above results show that after treatment of electroplating wastewater wells, Cr 6+ Total Cr, SS, COD cr The levels of BOD5 and petroleum hydrocarbons all meet the relevant emission standards, and the treatment efficiency is higher than 90%, achieving the expected treatment effect.
[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.
[0039] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. An electroplating wastewater treatment device, characterized in that: include: The electroplating production line includes oily wastewater pipes, post-plating wastewater pipes, domestic sewage pipes, and other wastewater pipes. The oily wastewater pipes are sequentially connected to an oil-water separator, a pretreatment equalization tank, a coagulation and flotation tank, a comprehensive equalization tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank, and a clear water tank. The post-plating wastewater pipes are connected to a reaction sedimentation tank, which is connected to the inlet of the pretreatment equalization tank. The domestic sewage pipes are connected to a bar screen, which is connected to the inlet of the comprehensive equalization tank. The other wastewater pipes are connected to the inlet of the pretreatment equalization tank.
2. The electroplating wastewater treatment device as described in claim 1, characterized in that: The oil-water separator is equipped with inclined tube packing in the middle, a floating oil collection device at the top, and a sludge hopper at the bottom. The oil-water separator is connected to a waste oil tank.
3. The electroplating wastewater treatment device as described in claim 2, characterized in that: The coagulation flotation tank includes a primary coagulation flotation tank and a secondary coagulation flotation tank. The inlet of the primary coagulation flotation tank is connected to the outlet of the pretreatment equalization tank, the outlet of the primary coagulation flotation tank is connected to the inlet of the secondary coagulation flotation tank, and the outlet of the secondary coagulation flotation tank is connected to the inlet of the integrated equalization tank.
4. The electroplating wastewater treatment device as described in claim 3, characterized in that: The primary coagulation flotation tank and the secondary coagulation flotation tank are respectively connected to the dosing equipment.
5. The electroplating wastewater treatment device as described in claim 4, characterized in that: The reaction sedimentation tank is connected to a dosing device.
6. The electroplating wastewater treatment device as described in claim 5, characterized in that: A nitrification liquid return pipe is installed between the aerobic tank and the anoxic tank, and a sludge return pipe is installed between the secondary sedimentation tank and the anoxic tank.
7. The electroplating wastewater treatment device as described in claim 6, characterized in that: The primary coagulation flotation tank, the secondary coagulation flotation tank, and the secondary sedimentation tank are each connected to a sludge discharge pipe. The sludge discharge pipe is connected to a sludge thickening tank, and the sludge thickening tank is connected to a screw press.
8. The electroplating wastewater treatment device as described in claim 7, characterized in that: The supernatant from the sludge thickening tank and the leachate from the screw press are respectively connected to the pretreatment equalization tank.