An oxidation wastewater reuse treatment system
By combining membrane technology and evaporation concentration processes, the problem of simultaneous treatment of nickel- and tin-containing oxidation wastewater has been solved, achieving zero discharge and reuse of wastewater, reducing costs and equipment investment, and allowing the water to be reused in the oxidation line sealing process after meeting the standards.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAMEN ANTAI NEW ENERGY TECH
- Filing Date
- 2025-04-16
- Publication Date
- 2026-06-19
AI Technical Summary
Existing technologies cannot efficiently treat nickel- and tin-containing oxidation wastewater simultaneously, resulting in high treatment costs, large equipment investment, and the inability to achieve zero emissions.
A system combining membrane and evaporation concentration processes is adopted, using a clear water tank, sand filter, security filter, ultrafiltration unit, primary and secondary reverse osmosis systems and evaporator to achieve simultaneous recovery and treatment of nickel and tin wastewater. Multi-stage separation is achieved by using ultrafiltration and reverse osmosis membranes, and the use of conductivity detection and evaporator ensures that the water quality meets the standards.
It achieves zero discharge of nickel- and tin-containing wastewater, reduces treatment costs and equipment footprint, meets the requirements for reclaimed water reuse, and can be reused in the oxidation line sealing process after the water quality meets the standards.
Smart Images
Figure CN224377835U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a wastewater treatment technology, and more particularly to an oxidation wastewater reuse treatment system. Background Technology
[0002] The anodizing process used in the manufacturing of photovoltaic aluminum profiles generates oxidation wastewater containing a large amount of metal ions, which must be treated before discharge. Among these metal ions, nickel and tin are the main pollutants, and their chemical properties differ. Currently, different treatment steps are used for wastewater with different compositions, such as chemical precipitation, ion exchange, and membrane separation. Therefore, systems for treating nickel-containing oxidation wastewater and systems for treating tin-containing oxidation wastewater are typically different.
[0003] For example, for nickel-containing wastewater, a process route of acidification and complex breaking → neutralization and precipitation → ion exchange → membrane concentration → nickel salt recovery can be used to recover nickel salts. For tin-containing wastewater, a process of oxidation-reduction → flocculation and precipitation → adsorption and filtration is generally used for treatment.
[0004] Therefore, achieving simultaneous processing of nickel and tin—that is, using a single treatment system to recycle and treat both nickel-containing and tin-containing wastewater—can help companies save on treatment costs, reduce equipment investment and floor space requirements, and has positive practical significance. Utility Model Content
[0005] To address the aforementioned problems, this utility model provides an oxidation wastewater reuse treatment system that simultaneously recycles and treats nickel- and tin-containing wastewater through a single system, demonstrating promising prospects for industrial application.
[0006] To solve this technical problem, the present invention adopts the following solution:
[0007] An oxidation wastewater reuse treatment system includes a clear water tank, a sand filter, a security filter, an ultrafiltration unit, an intermediate water tank, a primary reverse osmosis system, a secondary reverse osmosis system, an evaporator, and a reuse water tank.
[0008] The clear water tank, the sand filter, and the security filter are connected in sequence. The ultrafiltration mechanism includes an ultrafiltration membrane. The inlet end of the ultrafiltration membrane is connected to the outlet of the security filter, the product water end of the ultrafiltration membrane is connected to the inlet of the intermediate water tank, and the outlet of the intermediate water tank is connected to the first-stage reverse osmosis system.
[0009] The first-stage reverse osmosis system includes a Dow brackish water membrane. The inlet end of the Dow brackish water membrane is connected to the outlet of the intermediate water tank through a first-stage filter. The product water end of the Dow brackish water membrane is connected to the reclaimed water tank. The concentrate end of the Dow brackish water membrane is connected to the first-stage reverse osmosis concentrate tank.
[0010] The secondary reverse osmosis system includes a disc tube reverse osmosis membrane. The inlet end of the disc tube reverse osmosis membrane is connected to the primary reverse osmosis concentrate tank through a secondary filter. The product water end of the disc tube reverse osmosis membrane is connected to the reclaimed water tank. The concentrate end of the disc tube reverse osmosis membrane is connected to the secondary reverse osmosis concentrate tank. The outlet of the secondary reverse osmosis concentrate tank is connected to the evaporator.
[0011] Furthermore, the sand filter is a carbon steel quartz sand filter.
[0012] Furthermore, the ultrafiltration membrane is a hollow fiber ultrafiltration membrane, and the filtration accuracy of the security filter is 50 micrometers or higher.
[0013] Furthermore, the ultrafiltration mechanism also includes a backwashing system connected to the hollow fiber ultrafiltration membrane.
[0014] Furthermore, in the first-stage reverse osmosis system, the filtration accuracy of the first-stage filter is 30 micrometers or higher.
[0015] Furthermore, in the primary reverse osmosis system, a conductivity testing device is connected to the pipeline connecting the product water end of the Dow brackish water membrane to the reclaimed water tank.
[0016] Furthermore, in the two-stage reverse osmosis system, the filtration accuracy of the secondary filter is 20 micrometers or higher.
[0017] Furthermore, in the secondary reverse osmosis system, a conductivity testing device is connected to the pipeline connecting the product water end of the disc tube reverse osmosis membrane to the reclaimed water tank.
[0018] Furthermore, the evaporator is a mechanical vapor compression evaporator.
[0019] Furthermore, the condensate outlet of the evaporator is connected to the recycled water tank, and the concentrate outlet of the evaporator is connected to the concentrate collection tank.
[0020] By adopting the aforementioned technical solution, compared with the prior art, this utility model, through a system combining membrane technology and evaporation concentration, can simultaneously achieve zero discharge of nickel-containing wastewater and tin-containing wastewater, saving treatment costs and equipment space. If only membrane technology is used, the wastewater desalination problem cannot be solved, and zero discharge cannot be achieved in the end; if only evaporation concentration or evaporation crystallization processes are used, the equipment investment and operating costs are high due to the large evaporation volume.
[0021] Using the system of this invention, the 20% concentrate produced by membrane separation is treated by evaporation concentration or crystallization process to achieve desalination of wastewater, thereby enabling the sustainable recycling of evaporation condensate and achieving near-zero discharge; the concentrate after evaporation concentration is outsourced for treatment; and the water quality in the recycled water tank can achieve a conductivity of no more than 200 μS / cm, a pH between 6.5 and 8.5, and a COD of no more than 100 mg / L, meeting the requirements for greywater reuse, and can be reused in the washing tank of the oxidation line sealing process. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the system structure provided in Embodiment 1 of this utility model. Detailed Implementation
[0023] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are only some embodiments of this utility model, not all embodiments, and are only used to illustrate this utility model, and should not be regarded as limiting the scope of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.
[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0026] Example 1:
[0027] refer to Figure 1 The oxidation wastewater reuse treatment system includes a clear water tank 1, a sand filter 2, a security filter 3, an ultrafiltration unit 4, an intermediate water tank 5, a primary filter 6, a Dow brackish water membrane 7, a reuse water tank 8, a primary reverse osmosis concentrate tank 9, a secondary filter 10, a disc tube reverse osmosis membrane 11, a secondary reverse osmosis concentrate tank 12, an evaporator 13, and a concentrate collection tank 14. Among them, the Dow brackish water membrane 7 is installed in the primary reverse osmosis system and is fixed by a fiberglass membrane shell. The disc tube reverse osmosis membrane 11 is installed in the secondary reverse osmosis system, and the area of a single membrane is 9 to 10 square meters.
[0028] The following describes the main connection relationships of the equipment: the clear water tank 1, sand filter 2 and security filter 3 are connected in sequence. The ultrafiltration mechanism 4 includes an ultrafiltration membrane. The inlet end of the ultrafiltration membrane is connected to the outlet of the security filter 3, the product water end of the ultrafiltration membrane is connected to the inlet of the intermediate water tank 5, and the outlet of the intermediate water tank 5 is connected to the first-stage reverse osmosis system.
[0029] The primary reverse osmosis system includes a Dow brackish water membrane 7. The inlet of the Dow brackish water membrane 7 is connected to the outlet of the intermediate water tank 5 through a primary filter 6. The product water end of the Dow brackish water membrane 7 is connected to the reclaimed water tank 8. The concentrate end of the Dow brackish water membrane 7 is connected to the primary reverse osmosis concentrate tank 9.
[0030] The two-stage reverse osmosis system includes a disc tube reverse osmosis membrane 11. The inlet end of the disc tube reverse osmosis membrane 11 is connected to the first-stage reverse osmosis concentrate tank 9 through a secondary filter 10. The product water end of the disc tube reverse osmosis membrane 11 is connected to the recycled water tank 8. The concentrate end of the disc tube reverse osmosis membrane 11 is connected to the second-stage reverse osmosis concentrate tank 12. The outlet of the second-stage reverse osmosis concentrate tank 12 is connected to the evaporator 13. The concentrate outlet of the evaporator 13 is connected to the concentrate collection tank 14.
[0031] The working principle of the above-mentioned oxidation wastewater reuse treatment system is as follows: After static sedimentation or preliminary filtration, the oxidation wastewater can enter the clear water tank. Although most of the suspended solids have been removed at this point, and the water appears basically clear and transparent, a small amount of fine suspended particles and colloids inevitably remain. Therefore, further treatment of suspended solids and colloids is necessary; otherwise, the ultrafiltration membrane will be contaminated during ultrafiltration treatment, hindering its operation. This system uses a sand filter to further remove suspended solids from the water and a security filter to block substances larger than 50 microns from entering the ultrafiltration unit. The ultrafiltration unit can effectively separate colloids, suspended particles, color, turbidity, bacteria, and large molecular organic matter, ensuring that the effluent SDI ≤ 3, thus creating conditions for entering the reverse osmosis process.
[0032] Due to the unique characteristics of oxidation wastewater, particularly its high content of nickel and tin ions, a single-stage reverse osmosis system can only achieve a recovery rate of approximately 50-60%. While adjusting the membrane process can increase the recovery rate to over 60%, this exacerbates membrane fouling, reduces membrane lifespan, and ultimately hinders long-term reliable operation. Therefore, the aforementioned system uses a first-stage reverse osmosis system for concentration and separation, followed by a second-stage reverse osmosis system for further concentration and separation. This achieves 80% wastewater reuse, effectively reducing the scale of subsequent evaporation and concentration processes, thereby significantly reducing project investment and operating costs.
[0033] Example 2:
[0034] This embodiment is an improvement on embodiment 1. Specifically, the sand filter is a carbon steel quartz sand filter. Since the oxidizing wastewater has a certain degree of corrosiveness, the main body adopts a carbon steel frame structure, which can improve the service life of the equipment.
[0035] The ultrafiltration membrane is a hollow fiber ultrafiltration membrane, and the ultrafiltration system also includes a backwashing system connected to the hollow fiber ultrafiltration membrane. Due to various factors, ultrafiltration membranes inevitably experience scaling or fouling. The chemical cleaning function of the backwashing system is used to clean the ultrafiltration membrane with appropriate chemicals when scaling or fouling leads to performance degradation. During cleaning, the chemical solution is continuously fed into the container to clean the ultrafiltration membrane. The cleaning solution is then returned to the cleaning tank for continuous circulation. This prevents suspended solids from damaging the ultrafiltration membrane during circulation, thus extending the membrane's lifespan.
[0036] Example 3:
[0037] This embodiment is an improvement upon Embodiment 1. Specifically, the Dow brackish water membrane in the first-stage reverse osmosis system is model 4040, which has the advantage of anti-fouling. The first-stage filter connected to the inlet of the Dow brackish water membrane has a filtration accuracy of 30 microns or higher, for example, a filtration accuracy of 25 microns or 20 microns can be used. A conductivity measuring device with a range of 0–20000 μS / cm is connected to the pipeline connecting the product water end of the Dow brackish water membrane to the reclaimed water tank. The conductivity measuring device can monitor the product water quality in real time to ensure that the water meets the standards before being introduced into the reclaimed water tank.
[0038] In a two-stage reverse osmosis system, the filtration precision of the secondary filter is 20 microns or higher; for example, a filtration precision of 15 microns or 10 microns can be used. A conductivity meter with a range of 0–20000 μS / cm is connected to the pipeline connecting the product water end of the disc tube reverse osmosis membrane to the reclaimed water tank. This conductivity meter allows for real-time monitoring of the product water quality, ensuring that the water meets standards before being introduced into the reclaimed water tank.
[0039] In this embodiment, a two-stage reverse osmosis system removes harmful substances such as particles, colloids, organic impurities, and microorganisms from the water, as well as 99% of dissolved salts, mainly nickel and tin salts, achieving water desalination and purification to ensure that the effluent meets reuse requirements. Specifically, the permeate from the first-stage reverse osmosis system is reused at the point of use. The concentrate from the first-stage reverse osmosis system is collected and then separated in the second-stage reverse osmosis system. The permeate from the second-stage reverse osmosis system is also reused at the point of use. The concentrate from the second-stage reverse osmosis system, containing high concentrations of salt, is further treated through an evaporation and concentration process.
[0040] Example 4:
[0041] This embodiment is an improvement upon Embodiment 1. Specifically, the evaporator is a mechanical vapor compression evaporator. A high-efficiency steam compressor compresses the secondary steam generated during evaporation, increasing its pressure and temperature. This enhanced secondary steam is then pumped into a heater to reheat the raw liquid. The heated raw liquid continues to evaporate, generating more secondary steam, thus achieving continuous evaporation. Because the existing heat energy of the secondary steam is recycled, external fresh steam is unnecessary, significantly reducing the energy consumption of the evaporation system. Therefore, the mechanical vapor compression evaporator (MVR evaporator) saves over 60%-80% of energy, over 95% of cooling water, and reduces the floor space by over 50% compared to traditional evaporators.
[0042] The condensate outlet of the evaporator is connected to the recycled water tank so that the water can be recycled and reused. The concentrated liquid after evaporation enters the concentrated liquid collection tank and can be centrally outsourced for further processing.
[0043] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.
Claims
1. An oxidation wastewater reuse treatment system, characterized in that: It includes a clear water tank, sand filter, security filter, ultrafiltration unit, intermediate water tank, primary reverse osmosis system, secondary reverse osmosis system, evaporator, and reclaimed water tank. The clear water tank, the sand filter, and the security filter are connected in sequence. The ultrafiltration mechanism includes an ultrafiltration membrane. The inlet end of the ultrafiltration membrane is connected to the outlet of the security filter, the product water end of the ultrafiltration membrane is connected to the inlet of the intermediate water tank, and the outlet of the intermediate water tank is connected to the first-stage reverse osmosis system. The first-stage reverse osmosis system includes a Dow brackish water membrane. The inlet end of the Dow brackish water membrane is connected to the outlet of the intermediate water tank through a first-stage filter. The product water end of the Dow brackish water membrane is connected to the reclaimed water tank. The concentrate end of the Dow brackish water membrane is connected to the first-stage reverse osmosis concentrate tank. The secondary reverse osmosis system includes a disc tube reverse osmosis membrane. The inlet end of the disc tube reverse osmosis membrane is connected to the primary reverse osmosis concentrate tank through a secondary filter. The product water end of the disc tube reverse osmosis membrane is connected to the reclaimed water tank. The concentrate end of the disc tube reverse osmosis membrane is connected to the secondary reverse osmosis concentrate tank. The outlet of the secondary reverse osmosis concentrate tank is connected to the evaporator.
2. The oxidation wastewater reuse treatment system according to claim 1, characterized in that: The sand filter is a carbon steel quartz sand filter.
3. The oxidation wastewater reuse treatment system according to claim 1 or 2, characterized in that: The ultrafiltration membrane is a hollow fiber ultrafiltration membrane, and the filtration accuracy of the security filter is 50 micrometers or higher.
4. The oxidation wastewater reuse treatment system according to claim 3, characterized in that: The ultrafiltration mechanism also includes a backwashing system, which is connected to the hollow fiber ultrafiltration membrane.
5. The oxidation wastewater reuse treatment system according to claim 1, characterized in that: In the primary reverse osmosis system, the primary filter has a filtration accuracy of 30 micrometers or higher.
6. The oxidation wastewater reuse treatment system according to claim 5, characterized in that: In the primary reverse osmosis system, a conductivity testing device is connected to the pipeline connecting the product water end of the Dow brackish water membrane to the reclaimed water tank.
7. The oxidation wastewater reuse treatment system according to claim 1, characterized in that: In the two-stage reverse osmosis system, the filtration accuracy of the secondary filter is 20 micrometers or higher.
8. The oxidation wastewater reuse treatment system according to claim 7, characterized in that: In the two-stage reverse osmosis system, a conductivity testing device is connected to the pipeline connecting the product water end of the disc tube reverse osmosis membrane to the reclaimed water tank.
9. The oxidation wastewater reuse treatment system according to claim 1, characterized in that: The evaporator is a mechanical vapor compression evaporator.
10. The oxidation wastewater reuse treatment system according to claim 9, characterized in that: The condensate outlet of the evaporator is connected to the recycled water tank, and the concentrate outlet of the evaporator is connected to the concentrate collection tank.