A zero-discharge system for wastewater in the tire industry
By adopting a parallel reverse osmosis membrane tube structure and a filter unit booster pump in the wastewater treatment system of the tire industry, the problems of secondary pollution and high energy consumption of concentrate in traditional two-stage reverse osmosis systems have been solved, achieving deep purification and zero discharge of concentrate.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO WANYUAN ENVIRONMENTAL TECH CO LTD
- Filing Date
- 2025-06-26
- Publication Date
- 2026-05-26
AI Technical Summary
In the existing tire manufacturing process, the traditional two-stage reverse osmosis system requires an intermediate water tank, which leads to secondary pollution of the concentrate, high equipment investment costs, and large energy losses, making it difficult to achieve effective pressurization treatment and zero discharge of the concentrate.
It adopts a primary reverse osmosis unit, a primary reverse osmosis concentration unit, and a secondary reverse osmosis system for deep treatment. Through the parallel reverse osmosis membrane tube structure and the booster pump of the filtration unit, it avoids the intermediate water tank and achieves deep purification and zero discharge of concentrated water.
It achieves efficient and in-depth treatment of concentrated wastewater, reduces the risk of secondary pollution and energy consumption, improves water utilization and system economy, and achieves the goal of zero wastewater discharge.
Smart Images
Figure CN224280018U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water treatment technology, specifically a zero-discharge system for wastewater in the tire industry. Background Technology
[0002] Currently, both domestic and international tire companies use traditional processes for production water and wastewater treatment, without any reuse system, resulting in the discharge of large amounts of wastewater and a waste of water resources.
[0003] Furthermore, in the field of water purification, existing technologies often employ a two-stage reverse osmosis system for deep purification of concentrated wastewater. Currently, traditional two-stage reverse osmosis systems typically require an intermediate water tank and associated pumps to pressurize the water flow during operation. However, the use of an intermediate water tank has certain drawbacks: firstly, while the concentrated wastewater remains in the intermediate tank, it may come into contact with impurities in the air or, due to factors such as the tank's inner wall material, lead to the growth of microorganisms and organic matter, resulting in secondary pollution of the concentrated wastewater and affecting the effectiveness and water quality of subsequent reverse osmosis treatment; secondly, the installation of an intermediate water tank and associated pumps increases the system's equipment investment costs, floor space, and operational and maintenance complexity, and the energy loss during the pump pressurization process also reduces the overall efficiency of the system. Therefore, how to achieve effective pressurization treatment of concentrated wastewater without the need for an intermediate water tank, thereby solving the secondary pollution problem and improving the system's economic efficiency, has become a pressing technical challenge in this field. Utility Model Content
[0004] To address one of the shortcomings of existing technologies, this utility model provides a zero-discharge system for wastewater in the tire industry, solving the problem of deep treatment of concentrated wastewater.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a zero-discharge wastewater system for the tire industry, comprising:
[0006] The first water treatment unit includes a raw water tank, a self-cleaning filter, an ultrafiltration system, and an ultrafiltration permeate buffer tank connected in sequence.
[0007] A primary reverse osmosis unit includes a primary reverse osmosis system, a reverse osmosis permeate tank, and a first concentrate tank; a reverse osmosis high-pressure pump is installed between the primary reverse osmosis system and the ultrafiltration permeate buffer tank, and the primary reverse osmosis system is connected to the reverse osmosis permeate tank and the first concentrate tank respectively through pipelines.
[0008] The reverse osmosis primary concentration unit includes a reverse osmosis primary concentration device and a second concentrate tank; the inlet of the reverse osmosis primary concentration device is connected to the first concentrate tank, and the reverse osmosis primary concentration device is provided with two outlets, one of which is connected to the reverse osmosis product water tank.
[0009] The advanced treatment two-stage reverse osmosis system performs advanced treatment two-stage reverse osmosis on the concentrate in the second concentrate tank.
[0010] Preferably, the deep treatment secondary reverse osmosis system includes:
[0011] A water supply unit, including a water tank for holding water to be treated;
[0012] A filtration unit is disposed on the outlet side of the water supply unit, and the filtration unit includes at least one filter;
[0013] A reverse osmosis unit is installed on the outlet side of the filter unit. The reverse osmosis unit includes reverse osmosis membrane tube A, reverse osmosis membrane tube B and reverse osmosis membrane tube C.
[0014] The reverse osmosis membrane tubes A and B are arranged in parallel pipeline structure, and the inlet ends of both reverse osmosis membrane tubes A and B are connected to the outlet end of the filtration unit; the concentrate outlet ends of reverse osmosis membrane tubes A and B are connected to the inlet end of reverse osmosis membrane tube C.
[0015] The product water outlets of the reverse osmosis membrane tubes A, B, and C converge through pipelines to form the product water outlet of the reverse osmosis unit.
[0016] Preferably, the water supply unit further includes:
[0017] The dosing assembly includes a dosing tank and a dosing pump, and the dosing assembly is connected to the outlet pipe of the water supply tank through a pipeline.
[0018] Preferably, the filtering unit further includes:
[0019] The first booster pump is located on the inlet side of the filter;
[0020] The second booster pump is located on the outlet side of the filter.
[0021] Preferably, the reverse osmosis unit further includes:
[0022] The first concentrate pipeline is connected to the concentrate outlet of the reverse osmosis membrane tube C.
[0023] The zero-discharge system for wastewater in the tire industry also includes:
[0024] The concentrate tank is connected to the inlet of the first concentrate pipeline.
[0025] Preferably, the reverse osmosis unit further includes:
[0026] The concentrate tank is connected to the first concentrate pipeline.
[0027] Preferably, the reverse osmosis unit further includes:
[0028] The return pipeline is connected at one end to the first concentrate pipeline and at the other end to the filter unit; the connection between the return pipeline and the filter unit is located on the inlet side of the second booster pump.
[0029] Preferably, the reverse osmosis unit further includes:
[0030] The second concentrate pipeline has one end connected to the concentrate outlet of the reverse osmosis membrane tube A and reverse osmosis membrane tube B, and the other end connected to the first concentrate pipeline.
[0031] Preferably, the reverse osmosis unit further includes:
[0032] The second water inlet passage is connected at one end to the water inlet of the reverse osmosis membrane tube A and reverse osmosis membrane tube B, and at the other end to the external concentrate supply unit.
[0033] Preferably, the concentrate tank is provided with two water outlet passages, one of which connects to the water-using unit and the other of which connects to the concentrate pool.
[0034] Preferably, the reverse osmosis unit further includes:
[0035] The third concentrate pipeline has its inlet end connected to the first concentrate pipeline and its outlet end connected to an external concentrate storage unit; and the product water ends of the reverse osmosis membrane tube A and the reverse osmosis membrane tube B are connected to the third concentrate pipeline through a branch pipe.
[0036] Preferably, the first water treatment unit further includes a fourth concentrate tank and a bag filter. The fourth concentrate tank is used to hold the concentrate after ultrafiltration by the ultrafiltration system, and the outlet of the fourth concentrate tank is connected to the inlet of the bag filter.
[0037] Preferably, the bag filter is connected to the raw water tank via a pipeline.
[0038] Compared with existing technologies, it has the following beneficial effects:
[0039] 1. This application utilizes a primary reverse osmosis unit, a primary reverse osmosis concentration unit, and a secondary reverse osmosis system for advanced treatment. The concentrate from the second concentrate tank undergoes secondary reverse osmosis treatment, and the treated concentrate then enters a third concentrate tank. The concentrate in the third tank is then subjected to low-temperature evaporation, achieving zero wastewater discharge. Ultimately, this fulfills the tire industry's requirements for high water utilization and low system energy consumption.
[0040] 2. Through the advanced two-stage reverse osmosis system structure, the concentrate from reverse osmosis membrane tubes A and B is not directly discharged, but instead supplied to reverse osmosis membrane tube C for a second filtration. An intermediate water tank is not used in the reverse osmosis section, reducing the risk of secondary water contamination from the tank. Simultaneously, the secondary pressurization of the filtration unit meets the power requirements for the feed water to the three membrane tubes in the reverse osmosis unit, significantly reducing energy consumption while reducing emissions for the enterprise.
[0041] 3. Because the concentration ratio of the third stage of this system is as high as 8 times, meaning that the reverse osmosis membrane tube C is more prone to scaling, its cleaning cycle differs from that of the first two stages. By setting up a second concentrate pipeline, the second concentrate pipeline can be opened when the reverse osmosis membrane tube C needs cleaning, thus not affecting the operation of the overall system. Attached Figure Description
[0042] Figure 1 This is a schematic diagram of the overall principle of the deep-processing two-stage reverse osmosis system according to an embodiment of this application;
[0043] Figure 2 This is a schematic diagram of the water supply unit of the deep treatment two-stage reverse osmosis system of this application;
[0044] Figure 3 This is a schematic diagram of the filtration unit of the deep-processing two-stage reverse osmosis system of this application;
[0045] Figure 4 This is a schematic diagram of the reverse osmosis unit of the deep-processing secondary reverse osmosis system of this application;
[0046] Figure 5 This is a schematic diagram of the effluent section of the deep treatment secondary reverse osmosis system of this application;
[0047] Figure 6 This is a process flow diagram of an embodiment of this application.
[0048] In the picture:
[0049] 1. Water supply unit; 11. Water supply tank; 12. Chemical dosing tank;
[0050] 2. Filter unit; 21. Filter; 22. First booster pump; 23. Second booster pump;
[0051] 3. Secondary reverse osmosis unit; 31. Reverse osmosis membrane tube A; 32. Reverse osmosis membrane tube B; 33. Reverse osmosis membrane tube C; 34. First concentrate line; 35. Return line; 36. Second concentrate line; 37. Third concentrate line; 38. Second inlet water passage
[0052] 4. Concentrate tank. Detailed Implementation
[0053] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. 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.
[0054] Please see Figures 1-6 This application provides the following technical solutions:
[0055] The advanced reverse osmosis system provided in this application includes a water supply unit 1, a filtration unit 2, and a secondary reverse osmosis unit 3. The water supply unit 1 includes a water tank 11 for holding the water to be treated, supplying the concentrated water to be treated. The filtration unit 2 is located on the outlet side of the water supply unit 1. The filtration unit 2 includes at least one filter 21, and also includes a first booster pump 22 and a second booster pump 23, which are respectively located on the inlet and outlet sides of the filter 21. Through the filtration unit 2, the concentrated water is initially filtered by the filter, and the concentrated water supplied by the water supply unit 1 is pressurized to facilitate its entry into the subsequent secondary reverse osmosis unit 3. The secondary reverse osmosis unit 3 is located on the outlet side of the filtration unit 2, and includes three reverse osmosis membrane tubes: reverse osmosis membrane tube A31, reverse osmosis membrane tube B32, and reverse osmosis membrane tube C33. The reverse osmosis membrane tubes A31 and B32 are arranged in parallel, and their inlet ends are connected to the outlet end of the filter unit 2. The concentrate outlet ends of the reverse osmosis membrane tubes A31 and B32 are connected to the inlet end of the reverse osmosis membrane tube C33. The product water outlet ends of the reverse osmosis membrane tubes A31, B32 and C33 converge through the pipeline to form the product water outlet end of the secondary reverse osmosis unit 3.
[0056] This structure prevents the direct discharge of concentrated water from reverse osmosis membrane tubes A31 and B32. Instead, it supplies the concentrated water to reverse osmosis membrane tube C33 for further filtration. The absence of an intermediate water tank in the reverse osmosis section reduces the risk of secondary contamination. Furthermore, the secondary pressurization of filtration unit 2 provides the necessary power for the feed water to the three membrane sections in the secondary reverse osmosis unit 3, significantly reducing energy consumption while minimizing emissions for the company.
[0057] Based on the above implementation scheme, the water supply tank 11 of water supply unit 1 has a volume of 10 cubic meters and is made of PE material. In addition, water supply unit 1 also includes a chemical dosing assembly 12, which includes a dosing tank and a dosing pump. The dosing assembly 12 is connected to the outlet pipe of water supply tank 11 via a pipeline. In this scheme, the added chemical is hydrochloric acid, the dosing pump is an APG603 pump, and the dosing tank has a volume of 200 liters. The dosing assembly 12 adopts a one-tank-one-pump configuration.
[0058] Based on the above implementation scheme, the first booster pump 22 is selected as a CHL15-30 pump, whose parameters meet the 15m... 3 / h*34.5m*3.0KW. The second booster pump 23 is a CDMF32-90 variable frequency pump, whose parameters meet the 22m 3 / h*152m*18.5KW. One first booster pump 22 and one second booster pump 23 are each installed. Filter 21 uses a 40-inch, 5µm, 10-core precision filter, meeting 16m... 3 / h flow rate requirement.
[0059] Based on the above implementation scheme, the reverse osmosis membrane tubes A31, B32, and C33 of the secondary reverse osmosis unit 3 are all 8-inch * 6 cores / set. The secondary reverse osmosis unit 3 also includes a first concentrate pipeline 34, with the concentrate outlet of the reverse osmosis membrane tube C33 connected to the first concentrate pipeline 34; the first concentrate pipeline 34 and the inlet of the third concentrate tank 4 are connected to the third concentrate tank 4, which has a volume of not less than 10 cubic meters and is also made of PE material. The secondary reverse osmosis unit 3 also includes a concentrate pool: the concentrate pool is also connected to the first concentrate pipeline 34. It should be noted that the concentrate pool and the third concentrate tank 4 are connected in parallel. In daily main drainage, concentrate primarily enters the third concentrate tank 4. In special circumstances, such as when the third concentrate tank 4 cannot be filled with concentrate, the concentrate pool is activated.
[0060] Based on the above implementation scheme, the secondary reverse osmosis unit 3 also includes a return pipeline 35. One end of the return pipeline 35 is connected to the first concentrate pipeline 34 via a tee, and the other end is connected to the filter unit 2. The connection between the return pipeline 35 and the filter unit 2 is located on the inlet side of the second booster pump 23. Furthermore, the return pipeline 35 is equipped with components such as a flow meter to control the concentrate flow rate, allowing a portion of the concentrate to undergo reverse osmosis filtration and circulation again.
[0061] Based on the above implementation scheme, the secondary reverse osmosis unit 3 also includes a second concentrate pipeline 36. One end of the second concentrate pipeline 36 is connected to the concentrate outlet of reverse osmosis membrane tubes A31 and B32, and the other end is connected to the first concentrate pipeline 34. Instruments for flow rate, pressure, and conductivity are installed on reverse osmosis membrane tubes A31, B32, and C33 to monitor the operating parameters of the third stage. Considering that the concentration ratio of the third stage of the system is as high as 8 times, meaning that reverse osmosis membrane tube C33 is more prone to scaling, its cleaning cycle differs from the first two stages. The second concentrate pipeline 36 allows for cleaning of reverse osmosis membrane tube C33 when necessary, without affecting the overall system operation.
[0062] Based on the above implementation scheme, the secondary reverse osmosis unit 3 also includes a second inlet passage 38. One end of the second inlet passage 38 is connected to the inlet end of reverse osmosis membrane tube A31 and reverse osmosis membrane tube B32, and the other end is connected to the external concentrate supply unit. Because the system in this scheme is a secondary system for deep concentrate treatment, considering that there may be related structural systems such as concentrate CIP effluent in the pre-treatment system, the second inlet passage 38 is reserved as the inlet pipeline of the secondary reverse osmosis unit 3.
[0063] Based on the above implementation scheme, the third concentrate tank 4 is equipped with two outlet channels: one channel connects to the water-using unit, and the other channel connects to the concentrate pool. This concentrate pool can be shared with the aforementioned concentrate pool or it can be a separate facility. If the third concentrate tank 4 is full, or when cleaning the third concentrate tank 4, the concentrate can be discharged into the concentrate pool.
[0064] Based on the above implementation scheme, the secondary reverse osmosis unit 3 also includes a third concentrate pipeline 37. The inlet end of the third concentrate pipeline 37 is connected to the first concentrate pipeline 34, and the outlet end is connected to an external concentrate storage unit. Furthermore, the product water ends of the reverse osmosis membrane tubes A31 and B32 are connected to the third concentrate pipeline 37 via a branch pipe. The normal product water output of this system can be supplied to structures such as the RO permeate tank, the concentrate CIP tank, and the sodium hydroxide dosing tank. The third concentrate tank 41 allows for direct use of its concentrate, such as in toilet flushing. The third concentrate pipeline 37 is provided to accommodate further filtration or other applications of the produced concentrate, which can be supplied to structures such as the concentrate CIP tank. As mentioned above, the concentrate CIP tank can then inject concentrate back into the secondary reverse osmosis unit 3 via the second inlet passage 38.
[0065] like Figure 6 As shown in the embodiment of this application, a zero-discharge system for wastewater in the tire industry is provided, including a first water treatment unit, a first-stage reverse osmosis unit, a first-stage reverse osmosis concentration unit, and a second-stage deep treatment reverse osmosis system.
[0066] The first water treatment unit includes a raw water tank, a self-cleaning filter, an ultrafiltration system, and an ultrafiltration permeate buffer tank, which are connected in sequence. Specifically, the first water treatment unit also includes a fourth concentrate tank and a bag filter. The fourth concentrate tank is used to hold the concentrate produced by the ultrafiltration system, and its outlet is connected to the inlet of the bag filter. The bag filter is connected to the raw water tank via a pipeline.
[0067] The primary reverse osmosis unit includes a primary reverse osmosis system, a reverse osmosis permeate tank, and a first concentrate tank; a reverse osmosis high-pressure pump is installed between the primary reverse osmosis system and the ultrafiltration permeate buffer tank, and the primary reverse osmosis system is connected to the reverse osmosis permeate tank and the first concentrate tank respectively through pipelines.
[0068] The reverse osmosis primary concentration unit includes a reverse osmosis primary concentration device and a second concentrate tank; the inlet of the reverse osmosis primary concentration device is connected to the first concentrate tank, and the reverse osmosis primary concentration device is provided with two outlets, one of which is connected to the reverse osmosis product water tank.
[0069] The advanced treatment two-stage reverse osmosis system performs advanced treatment two-stage reverse osmosis on the concentrate in the second concentrate tank.
[0070] like Figures 1-6 As shown in the illustration, a specific embodiment of this system is applied in a tire company. Tap water first enters the factory's raw water tank, passes through a self-cleaning filter and an ultrafiltration system to remove suspended solids, then passes through an ultrafiltration permeate buffer tank, and is then pumped into the first-stage reverse osmosis system by a high-pressure reverse osmosis pump. The first-stage reverse osmosis system produces the pure water required for production, which is supplied to the points of use via a variable frequency water supply system. The concentrated water produced by the first-stage reverse osmosis system enters the first concentrated water tank.
[0071] After treatment, the water in the first concentrate tank is pumped to the first-stage reverse osmosis concentration unit for further concentration. The permeate is then reused in the reverse osmosis permeate tank for production. The concentrate enters the second concentrate tank, where it undergoes chemical dosing and filtration to remove hardness. It then enters the second-stage reverse osmosis system for further treatment. The second-stage reverse osmosis system performs low-temperature evaporation on the concentrate entering the concentrate tank, achieving zero wastewater discharge.
[0072] The wastewater from a tire company's equalization tank passes through a screen, equalization tank, hydrolysis acidification, MBBR, and filtration, ultrafiltration, and nanofiltration systems before entering the ultrafiltration permeate buffer tank for reuse. The concentrated wastewater enters a third concentrated wastewater tank for further treatment. Finally, the concentrated wastewater is evaporated at low temperature to achieve zero discharge.
[0073] In the description of this application and its embodiments, it should be understood that the terms "top", "bottom", "height", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application 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 application.
[0074] In this application and its embodiments, unless otherwise expressly specified and limited, the terms "set," "install," "connect," "link," "fix," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0075] In this application and its embodiments, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0076] The foregoing disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.
[0077] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.
[0078] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.
Claims
1. A zero-discharge wastewater system for the tire industry, characterized in that, include: The first water treatment unit includes a raw water tank, a self-cleaning filter, an ultrafiltration system, and an ultrafiltration permeate buffer tank connected in sequence. A primary reverse osmosis unit includes a primary reverse osmosis system, a reverse osmosis permeate tank, and a first concentrate tank; a reverse osmosis high-pressure pump is installed between the primary reverse osmosis system and the ultrafiltration permeate buffer tank, and the primary reverse osmosis system is connected to the reverse osmosis permeate tank and the first concentrate tank respectively through pipelines. The reverse osmosis primary concentration unit includes a reverse osmosis primary concentration device and a second concentrate tank; the inlet of the reverse osmosis primary concentration device is connected to the first concentrate tank, and the reverse osmosis primary concentration device is provided with two outlets, one of which is connected to the reverse osmosis product water tank. The advanced treatment two-stage reverse osmosis system performs advanced treatment two-stage reverse osmosis treatment on the concentrate in the second concentrate tank, and the advanced treatment two-stage reverse osmosis system also includes a third concentrate tank.
2. The zero-discharge wastewater system for the tire industry as described in claim 1, characterized in that, The deep-treatment two-stage reverse osmosis system includes: A water supply unit, including a water tank for holding water to be treated; A filtration unit is disposed on the outlet side of the water supply unit, and the filtration unit includes at least one filter; A secondary reverse osmosis unit is located on the outlet side of the filtration unit. The secondary reverse osmosis unit includes reverse osmosis membrane tube A, reverse osmosis membrane tube B, and reverse osmosis membrane tube C. The reverse osmosis membrane tubes A and B are arranged in parallel pipeline structure, and the inlet ends of both reverse osmosis membrane tubes A and B are connected to the outlet end of the filtration unit; the concentrate outlet ends of reverse osmosis membrane tubes A and B are connected to the inlet end of reverse osmosis membrane tube C. The product water outlets of the reverse osmosis membrane tubes A, B, and C converge through pipelines to form the product water outlet of the reverse osmosis unit.
3. The zero-discharge wastewater system for the tire industry as described in claim 2, characterized in that, The water supply unit also includes: The dosing assembly includes a dosing tank and a dosing pump, and the dosing assembly is connected to the outlet pipe of the water supply tank through a pipeline; The filtering unit further includes: The first booster pump is located on the inlet side of the filter; The second booster pump is located on the outlet side of the filter.
4. The zero-discharge wastewater system for the tire industry as described in claim 3, characterized in that, The reverse osmosis unit also includes: The first concentrate pipeline is connected to the concentrate outlet of the reverse osmosis membrane tube C. The inlet ends of the first concentrate pipeline and the third concentrate tank are connected.
5. The zero-discharge wastewater system for the tire industry as described in claim 4, characterized in that, The reverse osmosis unit also includes: The concentrate tank is connected to the first concentrate pipeline.
6. The zero-discharge wastewater system for the tire industry as described in claim 5, characterized in that, The reverse osmosis unit also includes: The return pipeline is connected at one end to the first concentrate pipeline and at the other end to the filter unit; the connection between the return pipeline and the filter unit is located on the inlet side of the second booster pump.
7. The zero-discharge wastewater system for the tire industry as described in claim 6, characterized in that, The reverse osmosis unit also includes: The second concentrate pipeline has one end connected to the concentrate outlet of the reverse osmosis membrane tube A and reverse osmosis membrane tube B, and the other end connected to the first concentrate pipeline.
8. The zero-discharge wastewater system for the tire industry as described in claim 7, characterized in that, The reverse osmosis unit also includes: The second water inlet passage is connected at one end to the water inlet of the reverse osmosis membrane tube A and the reverse osmosis membrane tube B, and at the other end to the external concentrate supply unit. The concentrate tank is equipped with two outlet channels, one of which connects to the water-using unit, and the other connects to the concentrate pool; the reverse osmosis unit also includes: The third concentrate pipeline has its inlet end connected to the first concentrate pipeline and its outlet end connected to an external concentrate storage unit; and the product water ends of the reverse osmosis membrane tube A and the reverse osmosis membrane tube B are connected to the third concentrate pipeline through a branch pipe.
9. The zero-discharge wastewater system for the tire industry as described in claim 1, characterized in that, The first water treatment unit further includes a fourth concentrate tank and a bag filter. The fourth concentrate tank is used to hold the concentrate after ultrafiltration by the ultrafiltration system, and the outlet of the fourth concentrate tank is connected to the inlet of the bag filter.
10. The zero-discharge wastewater system for the tire industry as described in claim 9, characterized in that, The bag filter is connected to the raw water tank via a pipeline.