Treatment method and system for film pretreatment wastewater

Abstract

The invention discloses a treatment method and system for film pretreatment wastewater. The method comprises the steps that an industrial wastewater collection water tank is adopted to collect industrial wastewater generated based on the process step of washing a to-be-cleaned object through a bottom discharge pipeline; a first filter is adopted to filter the water body output by the industrial wastewater collection water tank, and a first filtered water body is obtained; filtering the industrial raw water output by the industrial raw water collecting water tank by adopting a second filter to obtain a second filtered water body; mixing the first filtered water body and the second filtered water body according to a set proportion of the first filtered water body and the second filtered water body to obtain a mixed water body; and carrying out ion removal treatment on the mixed water body by adopting a reverse osmosis device. By means of the scheme, it can be guaranteed that the obtained pure water has the characteristics of being few in ions and low in conductivity. Meanwhile, the industrial wastewater can be recycled and reused, and environmental protection and sustainable development are facilitated. In addition, zero discharge of industrial wastewater can be realized.

Description

Technical Field

[0001] The present application generally relates to the field of wastewater treatment technology. More specifically, the present application relates to a method and system for treating wastewater before membrane treatment. Background Art

[0002] In the process of vehicle manufacturing, it is crucial to improve the anti-corrosion performance of the vehicle body, and the washing process of the object to be cleaned is an indispensable key step. However, in order to clean the body in white, the traditional pre-treatment process consumes a large amount of industrial water and reverse osmosis (RO) water every day, and generates hundreds of tons of industrial wastewater, which not only increases the cost of water resources, but also imposes a heavy burden on the environment.

[0003] In the prior art, during the treatment process of membrane pre-treatment wastewater, the wastewater is directly discharged, which not only causes environmental pollution and ecological damage, but also leads to a waste of water resources.

[0004] In view of this, there is an urgent need to provide a treatment solution for membrane pre-treatment wastewater to improve the utilization rate of wastewater and achieve the goal of zero wastewater discharge. Summary of the invention

[0005] In order to at least solve one or more of the technical problems mentioned above, the present application proposes a treatment scheme for membrane pre-treatment wastewater in multiple aspects.

[0006] In the first aspect, the present application provides a method for treating membrane pre-treatment wastewater, comprising: using an industrial wastewater collection tank to collect industrial wastewater generated by a process step of washing objects to be cleaned through a bottom discharge pipe; using a first filter to filter the water output from the industrial wastewater collection tank to obtain a first filtered water body; using a second filter to filter the industrial raw water output from the industrial raw water collection tank to obtain a second filtered water body; mixing the first filtered water body and the second filtered water body according to a set ratio of the first filtered water body and the second filtered water body to obtain a mixed water body; and using a reverse osmosis device to remove ions from the mixed water body.

[0007] In some embodiments, a reverse osmosis device is used to remove ions from the mixed water to produce pure water and concentrated water.

[0008] In some embodiments, the method further comprises: storing the pure water in a reverse osmosis water tank for washing the objects to be cleaned.

[0009] In some embodiments, the method further comprises: inputting the concentrated water into the industrial wastewater collection tank.

[0010] In some embodiments, the method further includes: inputting the concentrated water into the industrial raw water collection tank.

[0011] In some embodiments, the first filter and the second filter use different filtering mechanisms, the first filter uses a pleated cartridge filter, and the second filter uses a combined filter consisting of a sand carbon filter and a pleated cartridge filter.

[0012] In some embodiments, the set ratio of the first filtered water body to the second filtered water body is 6:1.

[0013] In some embodiments, before the mixed water body is subjected to ion removal treatment using a reverse osmosis device, the mixed water body is subjected to filtration treatment using a third filter.

[0014] In some embodiments, the pH value of the mixed water body is 6.2-6.5.

[0015] In the second aspect, the present application provides a system for treating membrane pre-treatment wastewater, which uses the membrane pre-treatment wastewater treatment method as described in any embodiment of the first aspect to treat membrane pre-treatment wastewater, and the system includes: an industrial wastewater collection tank, which is used to collect industrial wastewater generated by the process steps of washing objects to be washed through a bottom discharge pipeline; a first filter, which is used to filter the water output from the industrial wastewater collection tank to obtain a first filtered water body; an industrial raw water collection tank, which is used to collect industrial raw water; a second filter, which is used to filter the industrial raw water output from the industrial raw water collection tank Industrial raw water is filtered to obtain a second filtered water body; a mixing water tank is used to mix the first filtered water body and the second filtered water body according to a set ratio of the first filtered water body and the second filtered water body to obtain a mixed water body; a third filter is used to filter the mixed water body output from the mixing water tank; a reverse osmosis device is used to remove ions from the water body after being filtered by the third filter; a reverse osmosis water tank is used to store pure water generated by the reverse osmosis device; wherein the concentrated water generated by the reverse osmosis device is stored in an industrial wastewater collection tank or an industrial raw water collection tank.

[0016] Through the treatment scheme of the wastewater pre-treatment of the membrane provided above, the embodiment of the present application can make the pH value of the formed mixed water body significantly increase compared with the industrial wastewater by mixing the first filtered water body obtained by filtering the industrial wastewater output from the industrial wastewater collection tank through the first filter and the second filtered water body obtained by filtering the industrial raw water through the second filter according to the set ratio, providing a good process basis for subsequent treatment. At the same time, the mixed water body is treated with ion removal by a reverse osmosis device, which can effectively remove the impurity ions in the mixed water body, improve the treatment efficiency of industrial wastewater, and ensure that the pure water obtained by the reverse osmosis device has the characteristics of less ions and low conductivity.

[0017] Furthermore, in some embodiments, pure water obtained by the reverse osmosis device is stored in a reverse osmosis water tank for use in the process step of washing the objects to be washed, which can achieve the recycling and reuse of industrial wastewater and contribute to environmental protection and sustainable development.

[0018] Furthermore, in some embodiments, by inputting the concentrated water obtained in the process of removing ions from the mixed water body using the reverse osmosis device into the industrial wastewater collection tank for further treatment, since the pH value of the concentrated water is higher than the pH value of the industrial wastewater in the industrial wastewater collection tank, and the conductivity is lower than the conductivity of the industrial wastewater in the industrial wastewater collection tank, the pH value of the industrial wastewater in the industrial wastewater collection tank can be adjusted, and the subsequent use of the second filtered water body obtained by filtering the industrial raw water can be reduced. At the same time, the ion concentration of the industrial wastewater in the industrial wastewater collection tank can be diluted, thereby reducing the pressure of the subsequent ion removal treatment by the reverse osmosis device. In addition, by storing pure water in the reverse osmosis tank and inputting the concentrated water into the industrial wastewater collection tank, the goal of zero discharge of industrial wastewater can be achieved.

[0019] Furthermore, in some embodiments, by inputting the concentrated water obtained in the process of removing ions from the mixed water body using the reverse osmosis device into the industrial raw water collection tank for further treatment, since the pH value and conductivity of the concentrated water are close to those of the industrial raw water, the pH value of the industrial wastewater output from the industrial wastewater collection tank can be adjusted together with the industrial raw water, thereby reducing the amount of industrial raw water used. In addition, by storing pure water in the reverse osmosis tank and inputting the concentrated water into the industrial raw water collection tank, the goal of zero discharge of industrial wastewater can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0021] Figure 1 An exemplary flow chart showing a method for treating wastewater before membrane treatment according to an embodiment of the present application;

[0022] Figure 2 An exemplary flow chart showing the process steps of washing an object to be cleaned according to an embodiment of the present application;

[0023] Figure 3 An exemplary structural block diagram of a treatment system for membrane pre-treatment wastewater according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0025] It should be understood that the terms "include" and "comprising" used in the specification and claims of the present application indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0026] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in this application specification and claims, unless the context clearly indicates otherwise, the singular forms of "a", "an" and "the" are intended to include plural forms. It should also be further understood that the term "and / or" used in this application specification and claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0027] The specific implementation of the present application is described in detail below with reference to the accompanying drawings.

[0028] During the vehicle manufacturing process, after the film is applied to the car body, the residual film liquid on the surface is removed through two parts of the tank, spraying and dipping. In order to avoid the occurrence of electrophoresis defects, 300 tons of fresh RO water are needed every day to continuously update the tank liquid to reduce the concentration of impurities in the tank liquid. After the update, industrial wastewater is directly discharged. At the same time, 428 tons of industrial water are needed to prepare 300 tons of RO water. The water consumption and industrial wastewater discharge are huge. At the same time, the water quality characteristics of industrial wastewater bring great challenges to its recycling. First, due to the long-term exposure of the tank liquid to the air, CO in the industrial wastewater 2 , CO 3 2- , HCO 3- The concentration is obviously high and contains residual fluorozirconic acid, which causes the pH value of industrial wastewater to be low and acidic. Secondly, industrial wastewater contains a large amount of by-product free fluoride ions, which leads to high conductivity of industrial wastewater and small particle size of fluoride ions, which is difficult to filter by conventional means. In addition, there are a small amount of metal impurities such as iron filings and welding slag in the waste liquid.

[0029] In the prior art, during the treatment process of membrane pre-treatment wastewater, the wastewater is directly discharged, which not only causes environmental pollution and ecological damage, but also leads to a waste of water resources.

[0030] In view of this, an embodiment of the present application provides a treatment scheme for membrane pre-treatment wastewater, which can adjust the pH value of industrial wastewater by using filtered water obtained by filtering industrial raw water, and obtain a mixed water body that meets the needs of subsequent processes without introducing other impurity ions. By removing ions from the mixed water body and utilizing the pure water and concentrated water obtained after the ion removal treatment, the recycling of industrial wastewater is realized and the goal of zero wastewater discharge is achieved.

[0031] Figure 1 An exemplary flow chart of a method 100 for treating wastewater before membrane treatment according to an embodiment of the present application is shown.

[0032] like Figure 1 As shown, in step S110, an industrial wastewater collection tank is used to collect industrial wastewater generated based on the process steps of washing the objects to be cleaned through a bottom discharge pipeline.

[0033] In the embodiments of the present application, the specific process involved in the aforementioned process step of washing the object to be cleaned can be referred to in Figure 2 .

[0034] Figure 2 An exemplary flow chart showing the process steps of washing an object to be cleaned according to an embodiment of the present application.

[0035] like Figure 2 As shown, in step S210, industrial raw water is used to clean the object to be cleaned. In step S220, pure water generated by a reverse osmosis device is used to clean the object to be cleaned after being cleaned with industrial raw water. In step S230, a protective film is formed on the surface of the object to be cleaned after being cleaned with pure water generated by a reverse osmosis device. In step S240, the object to be cleaned with the protective film formed is sprayed with pure water generated by a reverse osmosis device. In step S250, the object to be cleaned after the spraying treatment is immersed in water using pure water generated by a reverse osmosis device.

[0036] Specifically, the pure water generated by the reverse osmosis device needs to meet the corresponding pH value and conductivity to avoid adverse effects on the objects to be cleaned.

[0037] Through the specific process involved in the process steps of washing the objects to be cleaned as described above, the process steps of washing the objects to be cleaned need to use industrial raw water and pure water produced by a reverse osmosis device that meets the pH and conductivity requirements. Therefore, when treating the membrane pre-treatment wastewater, in order to achieve the reuse of industrial wastewater, the pH value of the industrial wastewater needs to be adjusted, and the ions in the industrial wastewater need to be removed to reduce the conductivity of the industrial wastewater.

[0038] In the embodiments of the present application, an industrial wastewater collection tank is used to collect industrial wastewater generated based on the process steps of washing the objects to be cleaned through a bottom discharge pipeline, which can provide the required amount of wastewater for subsequent treatment.

[0039] After executing step S110, in step S120, a first filter is used to filter the water output from the industrial wastewater collection tank to obtain a first filtered water body.

[0040] In an embodiment of the present application, the first filter is a pleated filter element filter.

[0041] By adopting the first filter, impurity particles of different sizes such as iron filings and welding slag contained in the water output from the industrial wastewater collection tank can be removed.

[0042] In some embodiments of the present application, the pore size of the first filter is 0.2 μm. In other embodiments of the present application, the pore size of the first filter can also be set according to the size of impurity particles in the water output from the industrial wastewater collection tank, and the present application does not limit this.

[0043] In the embodiment of the present application, since the first filter cannot remove fluorozirconate, carbonate ions and the like in the water output from the industrial wastewater collection tank, the first filtered water obtained after filtration by the first filter is highly acidic.

[0044] After executing step S120, in step S130, the industrial raw water output from the industrial raw water collection tank is filtered using a second filter to obtain a second filtered water body.

[0045] In an embodiment of the present application, industrial raw water is collected by an industrial raw water collection tank, and then the industrial raw water output from the industrial raw water collection tank is filtered using a second filter.

[0046] By using industrial raw water collection tanks to collect industrial raw water, the required amount of industrial raw water can be provided for subsequent treatment.

[0047] In an embodiment of the present application, the second filter and the first filter use different filtering mechanisms, and the second filter uses a combined filter consisting of a sand carbon filter and a pleated filter element filter.

[0048] By using the second filter, the larger suspended particles and some organic pollutants in the industrial raw water are removed by the sand carbon filter in the primary filtration stage. Subsequently, the industrial raw water after the primary filtration stage enters the pleated filter cartridge filter for fine filtration, ensuring that the final output of the second filtered water body reaches a higher purity standard.

[0049] In the embodiments of the present application, the pore size of the sand carbon filter may be set according to the size of the particulate impurities in the industrial raw water, and the present application does not limit this.

[0050] In some embodiments of the present application, the pore size of the pleated filter cartridge filter in the second filter is 0.2 μm. In other embodiments of the present application, the pore size of the pleated filter cartridge filter in the second filter may also be set according to the size of impurity particles in the industrial raw water after the primary filtration stage, and the present application does not limit this.

[0051] In the embodiments of the present application, since the pH value of industrial raw water is in the range of 7.0-7.4 and is weakly alkaline, filtering the industrial raw water with the second filter will not change the pH value of the industrial raw water. Therefore, the pH value of the obtained second filtered water body is also in the range of 7.0-7.4, which can be used as a stable, safe and convenient regulatory substance.

[0052] After step S130 is performed, in step S140, the first filtered water body and the second filtered water body are mixed according to a set ratio between the first filtered water body and the second filtered water body to obtain a mixed water body.

[0053] In the embodiments of the present application, the set ratio of the first filtered water body and the second filtered water body is obtained according to the measured pH value of the industrial raw water and the pH value of the industrial wastewater, so that the pH value of the mixed water body meets the subsequent needs. The present application does not impose specific restrictions on the set ratio of the first filtered water body and the second filtered water body. For example, in some embodiments of the present application, the set ratio of the first filtered water body and the second filtered water body is 6:1. By setting the set ratio of the first filtered water body and the second filtered water body to 6:1, the pH value of the obtained mixed water body ranges from 6.2 to 6.5. When the object to be cleaned is a car body, the pure water generated by inputting it into the reverse osmosis device can meet the needs of the pre-treatment electrophoresis process in the whole vehicle manufacturing process.

[0054] In other embodiments of the present application, when the object to be cleaned is other objects outside the vehicle body, the set ratio of the first filtered water body and the second filtered water body is reset to obtain a mixed water body with a corresponding pH value, which is input into the reverse osmosis device to produce pure water that can be used to clean the corresponding object.

[0055] After executing step S140, in step S150, a reverse osmosis device is used to perform ion removal treatment on the mixed water body.

[0056] In the embodiment of the present application, a reverse osmosis device is used to remove ions from a mixed water body to produce pure water and concentrated water. Pure water is purified water obtained after being treated by a reverse osmosis membrane in a reverse osmosis device, and generally contains a lower concentration of dissolved solids. Concentrated water is the part of water that is not retained by the reverse osmosis membrane in the reverse osmosis device, and contains a higher concentration of dissolved solids and other impurities.

[0057] In the embodiments of the present application, when a reverse osmosis device is used to treat a mixed water body, since the pore size of the reverse osmosis membrane pores in the reverse osmosis device is very small, it can effectively intercept dissolved salts, impurity ions, microorganisms, etc. in the mixed water body, thereby ensuring that the produced pure water and concentrated water have a lower conductivity.

[0058] In some embodiments of the present application, the conductivity of the obtained pure water is 4 μs / cm, the pH value of the obtained pure water is 6.8, the conductivity range of the obtained concentrated water is 240 μs / cm-260 μs / cm, and the pH value of the obtained concentrated water is 6.5. The conductivity and pH value of the pure water meet the index requirements of process reverse osmosis water. Since the conductivity of industrial wastewater generally exceeds 1000 μS / cm, and the pH value of industrial wastewater is less than 6. Thus, the pH value of the concentrated water is higher than the pH value of the industrial wastewater, and the conductivity of the concentrated water is less than the conductivity of the industrial wastewater. At the same time, the pH value of the concentrated water is close to the pH value of the industrial raw water, and the conductivity of the concentrated water is close to the pH value of the industrial raw water.

[0059] In an embodiment of the present application, pure water is stored in a reverse osmosis water tank for use in a process step of washing objects to be cleaned, thereby realizing the recycling and reuse of industrial wastewater.

[0060] In some embodiments of the present application, concentrated water is input into an industrial wastewater collection tank to be treated again together with the industrial wastewater. Since the pH value of the concentrated water is higher than the pH value of the industrial wastewater in the industrial wastewater collection tank, and the conductivity is lower than the conductivity of the industrial wastewater in the industrial wastewater collection tank, the pH value of the industrial wastewater in the industrial wastewater collection tank can be adjusted, thereby reducing the subsequent usage of the second filtered water body obtained based on filtering industrial raw water. At the same time, the ion concentration of the industrial wastewater in the industrial wastewater collection tank can be diluted, thereby reducing the pressure of subsequent ion removal treatment through a reverse osmosis device.

[0061] In other embodiments of the present application, the concentrated water is input into the industrial raw water collection tank. Since the pH value and conductivity of the concentrated water are close to those of the industrial raw water, the concentrated water can be used together with the industrial raw water to adjust the pH value of the industrial wastewater output from the industrial wastewater collection tank, thereby reducing the amount of industrial raw water used.

[0062] By storing pure water in a reverse osmosis water tank and inputting concentrated water into an industrial wastewater collection tank or an industrial raw water collection tank, the goal of zero discharge of industrial wastewater can be achieved, thereby saving pure water in the process steps.

[0063] In an embodiment of the present application, before the mixed water body is treated for ion removal by a reverse osmosis device, the mixed water body is filtered by a third filter. Specifically, the interior of the third filter can be filled with a variety of different types of filter materials, such as quartz sand, anthracite, manganese sand, etc. These filter materials are arranged in a specific order, and each layer has a different particle size and density, thereby achieving graded filtration. Through graded filtration, larger particles are first captured by the coarser filter material on the upper layer, while smaller particles are intercepted by the finer filter material on the lower layer, thereby improving the overall filtration efficiency and accuracy.

[0064] By filtering the mixed water body with the third filter, the reverse osmosis membrane can be protected from damage by larger particles, suspended matter and organic matter.

[0065] In summary, through the treatment scheme for membrane pre-treatment wastewater provided above, through the treatment scheme for membrane pre-treatment wastewater provided above, the embodiment of the present application mixes the first filtered water body obtained by filtering the industrial wastewater output from the industrial wastewater collection tank through the first filter and the second filtered water body obtained by filtering the industrial raw water through the second filter according to the set ratio, so that the pH value of the formed mixed water body can be significantly increased compared with the industrial wastewater, providing a good process basis for subsequent treatment. At the same time, the mixed water body is treated with ion removal by a reverse osmosis device, which can effectively remove impurity ions in the mixed water body, improve the treatment efficiency of industrial wastewater, and ensure that the pure water obtained by the reverse osmosis device has the characteristics of less ions and low conductivity.

[0066] Furthermore, in some embodiments, pure water obtained by the reverse osmosis device is stored in a reverse osmosis water tank for use in the process step of washing the objects to be washed, which can achieve the recycling and reuse of industrial wastewater and contribute to environmental protection and sustainable development.

[0067] Furthermore, in some embodiments, by inputting the concentrated water obtained in the process of removing ions from the mixed water body using the reverse osmosis device into the industrial wastewater collection tank for further treatment, since the pH value of the concentrated water is higher than the pH value of the industrial wastewater in the industrial wastewater collection tank, and the conductivity is lower than the conductivity of the industrial wastewater in the industrial wastewater collection tank, the pH value of the industrial wastewater in the industrial wastewater collection tank can be adjusted, and the subsequent use of the second filtered water body obtained by filtering the industrial raw water can be reduced. At the same time, the ion concentration of the industrial wastewater in the industrial wastewater collection tank can be diluted, thereby reducing the pressure of the subsequent ion removal treatment by the reverse osmosis device. In addition, by storing pure water in the reverse osmosis tank and inputting the concentrated water into the industrial wastewater collection tank, the goal of zero discharge of industrial wastewater can be achieved.

[0068] Furthermore, in some embodiments, by inputting the concentrated water obtained in the process of removing ions from the mixed water body using the reverse osmosis device into the industrial raw water collection tank for further treatment, since the pH value and conductivity of the concentrated water are close to those of the industrial raw water, the pH value of the industrial wastewater output from the industrial wastewater collection tank can be adjusted together with the industrial raw water, thereby reducing the amount of industrial raw water used. In addition, by storing pure water in the reverse osmosis tank and inputting the concentrated water into the industrial raw water collection tank, the goal of zero discharge of industrial wastewater can be achieved.

[0069] The embodiment of the present application also provides a treatment system for membrane pretreatment wastewater, which can use the aforementioned membrane pretreatment wastewater treatment method 100 to treat membrane pretreatment wastewater, or can use other methods to treat membrane pretreatment wastewater, which is not limited by the present application.

[0070] Figure 3 An exemplary structural block diagram of a treatment system 300 for membrane pre-treatment wastewater according to an embodiment of the present application is shown.

[0071] like Figure 3 As shown, the system 300 includes an industrial wastewater collection tank 310 , a first filter 320 , an industrial raw water collection tank 330 , a second filter 340 , a mixing tank 350 , a third filter 360 , a reverse osmosis device 370 and a reverse osmosis water tank 380 .

[0072] Specifically, the industrial wastewater collection tank 310 is used to collect industrial wastewater generated based on the process steps of washing the objects to be washed through the bottom discharge pipeline.

[0073] Specifically, the first filter 320 is used to filter the water from the industrial wastewater collection tank 310 to obtain a first filtered water body.

[0074] Specifically, the industrial raw water collection tank 330 is used to collect industrial raw water.

[0075] Specifically, the second filter 340 is used to filter the industrial raw water output from the industrial raw water collection tank 330 to obtain a second filtered water body. The second filter 340 is connected to the industrial raw water source or the industrial raw water storage tank through a pipeline.

[0076] Specifically, the mixing water tank 350 is used to mix the first filtered water body and the second filtered water body according to the set ratio of the first filtered water body and the second filtered water body to obtain the mixed water body. The first filtered water body inlet and the second filtered water body inlet can be provided in the mixing water tank 350, and a first flow meter is provided at the first filtered water body inlet, and a second flow meter is provided at the second filtered water body inlet. The water volume of the first filtered water body and the second filtered water body input into the mixing water tank 350 is obtained by the first flow meter and the second flow meter, thereby adjusting the water volume of the first filtered water body and the second filtered water body input into the mixing water tank 350 so that the ratio of the first filtered water body and the second filtered water body in the mixing water tank 350 is the set ratio.

[0077] Specifically, the third filter 360 is used to filter the mixed water output from the mixing water tank 350 .

[0078] Specifically, the reverse osmosis device 370 is used to perform ion removal treatment on the water filtered by the third filter 360 .

[0079] Specifically, the reverse osmosis water tank 380 is used to store pure water generated by the reverse osmosis device.

[0080] Specifically, the concentrated water generated by the reverse osmosis device 370 is stored in the industrial wastewater collection tank 310 or the industrial raw water collection tank 330 .

[0081] When the system 300 uses the aforementioned membrane pre-treatment wastewater treatment method 100 to treat membrane pre-treatment wastewater, the industrial wastewater collection tank 310 is used to perform the aforementioned step S110, and in some embodiments, the relevant steps of treating concentrated water are performed, the first filter 320 is used to perform the aforementioned step S120, the industrial raw water collection tank 330 is used to collect industrial raw water, and in other embodiments, the relevant steps of treating concentrated water are performed, the second filter 340 is used to perform the aforementioned step S130, the mixing water tank 350 is used to perform the aforementioned step S140, the third filter 360 is used to perform the aforementioned step of filtering the mixed water body, the reverse osmosis device 370 is used to perform the aforementioned step S150, and the reverse osmosis water tank 380 is used to perform the aforementioned step of storing pure water. The specific execution process can be referred to the above text, which will not be repeated here.

[0082] Although multiple embodiments of the present application have been shown and described herein, it is obvious to those skilled in the art that such embodiments are provided only by way of example. Those skilled in the art can think of many changes, modifications and alternatives without departing from the thought and spirit of the present application. It should be understood that in the process of practicing the present application, various alternatives to the embodiments of the present application described herein can be adopted. The attached claims are intended to limit the scope of protection of the present application, and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A method for treating wastewater before film treatment, characterized in that: include: An industrial wastewater collection tank is used to collect industrial wastewater generated by the process of washing the objects to be cleaned through a bottom discharge pipeline; Using a first filter to filter the water output from the industrial wastewater collection tank to obtain a first filtered water body; The second filter is used to filter the industrial raw water output from the industrial raw water collection tank to obtain a second filtered water body; Mixing the first filtered water body and the second filtered water body according to a set ratio of the first filtered water body and the second filtered water body to obtain a mixed water body; The mixed water body is treated for ion removal using a reverse osmosis device.

2. The method for treating wastewater before film treatment according to claim 1, characterized in that: The mixed water body is treated by reverse osmosis device to remove ions and produce pure water and concentrated water.

3. The method for treating wastewater before film treatment according to claim 2, characterized in that: The method further comprises a process step of storing the pure water in a reverse osmosis water tank for washing objects to be cleaned.

4. The method for treating wastewater before film treatment according to claim 2 or 3, characterized in that: The method further includes: inputting the concentrated water into the industrial wastewater collection tank.

5. The method for treating film pre-treatment wastewater according to claim 2 or 3, characterized in that: The method further includes: inputting the concentrated water into the industrial raw water collection tank.

6. The method for treating wastewater before film treatment according to claim 5, characterized in that: The first filter and the second filter use different filtering mechanisms. The first filter uses a pleated filter element filter, and the second filter uses a combined filter consisting of a sand carbon filter and a pleated filter element filter.

7. The method for treating wastewater before film treatment according to claim 6, characterized in that: The set ratio of the first filtered water body to the second filtered water body is 6:

1.

8. The method for treating wastewater before film treatment according to claim 1, characterized in that: Before the mixed water body is subjected to ion removal treatment by using the reverse osmosis device, the mixed water body is subjected to filtration treatment by using a third filter.

9. The method for treating wastewater before film treatment according to claim 1, characterized in that: The pH value of the mixed water body is 6.2-6.

5.

10. A treatment system for membrane pre-treatment wastewater, characterized in that: The membrane pretreatment wastewater treatment method according to any one of claims 1 to 9 is used to treat the membrane pretreatment wastewater, and the system comprises: An industrial wastewater collection tank, used to collect industrial wastewater generated by a process step of washing the objects to be cleaned through a bottom discharge pipeline; A first filter is used to filter the water output from the industrial wastewater collection tank to obtain a first filtered water body; Industrial raw water collection tank, used to collect industrial raw water; The second filter is used to filter the industrial raw water output from the industrial raw water collection tank to obtain a second filtered water body; A mixing water tank, used for mixing the first filtered water body and the second filtered water body according to a set ratio of the first filtered water body and the second filtered water body to obtain a mixed water body; The third filter is used to filter the mixed water output from the mixing water tank; A reverse osmosis device for removing ions from the water after being filtered by the third filter; Reverse osmosis water tank, used to store pure water produced by reverse osmosis device; Among them, the concentrated water produced by the reverse osmosis device is stored in an industrial wastewater collection tank or an industrial raw water collection tank.

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