System for adding alkali waste liquid into acid waste liquid

Abstract

The utility model discloses a system for adding alkali waste liquid into acid waste liquid. The system comprises an alkali waste liquid collecting device; one end of the first pump is connected with the alkali waste liquid collecting device; one end of the alkali waste liquid pretreatment device is connected with the other end of the first pump; one end of the second pump is connected with the other end of the alkali waste liquid pretreatment device; and the acid-base neutralization device is connected with the other end of the second pump, and a pH detection unit is arranged in the acid-base neutralization device. According to the utility model, the alkali waste liquid generated in the texturing process and the alkali polishing process of the solar cell piece can be safely and stably introduced into the acid waste liquid treatment process of the photovoltaic monocrystalline silicon piece for treatment, so that the problem that the acid waste liquid treatment cost of the monocrystalline silicon piece is high is solved; the problems of high treatment cost of the alkali waste liquid of the solar cell and high construction cost of a wastewater integrated system are solved, and the treatment cost of the alkali waste liquid and the acid waste liquid is remarkably reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste liquid treatment, and in particular to a system for adding alkali waste liquid into acid waste liquid. Background Art

[0002] In the texturing process and alkaline polishing process of solar cells, electronic grade NaOH solution with a concentration of 48% is used, mixed with a small amount of pure water, and then the cells are subjected to alkaline corrosion processing. A large amount of alkaline waste liquid is generated in this process. The alkaline waste liquid flows to the waste liquid collection pool through the pipeline gravity, and then is lifted to the concentrated alkali collection pool of the wastewater station by a water pump, and then lifted to the dilute alkali collection pool by a pump, and finally lifted to the dilute alkali reaction pool, and then acid-base neutralization treatment is carried out by adding industrial grade H2SO4 solution with a concentration of 50%. It can only be discharged after meeting the emission standards.

[0003] Photovoltaic monocrystalline silicon wafers are the upstream industry of solar cell wafers. During the production process, they need to go through processes such as grooving, cutting, degumming and cleaning. The above processes will produce a large amount of acid waste liquid, which will flow to the waste liquid collection pool through pipes and then be lifted to the wastewater station by water pumps. During the treatment process, it is necessary to add 30% industrial-grade NaOH solution for acid-base neutralization treatment, and it can only be discharged after meeting the emission standards.

[0004] In the related art, the alkaline waste liquid generated during the texturing process and alkaline polishing process of solar cells and the acid waste liquid generated during the production of photovoltaic monocrystalline silicon wafers all need to be treated separately, with high treatment costs, and the cost of building a complete set of wastewater treatment systems is also high. Utility Model Content

[0005] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the purpose of the utility model is to propose a system for adding alkaline waste liquid to acid waste liquid. The utility model can safely and stably introduce the alkaline waste liquid generated in the texturing process and alkaline polishing process of solar cell sheets into the acid waste liquid treatment process of photovoltaic monocrystalline silicon wafers for treatment, thereby solving the problem of high cost of acid waste liquid treatment of monocrystalline silicon wafers, solving the problem of high cost of alkaline waste liquid treatment of solar cells, solving the problem of high cost of construction of wastewater complete system, and significantly reducing the treatment cost of alkaline waste liquid and acid waste liquid.

[0006] In order to achieve the above-mentioned purpose, the utility model proposes a system for adding alkali waste liquid to acid waste liquid. According to an embodiment of the utility model, the system for adding alkali waste liquid to acid waste liquid comprises:

[0007] An alkali waste liquid collecting device, wherein the alkali waste liquid collecting device is used to collect alkali waste liquid, wherein the alkali waste liquid contains hydrogen peroxide and process additives;

[0008] a first pump, one end of which is connected to the alkali waste liquid collecting device;

[0009] an alkali waste liquid pretreatment device, one end of which is connected to the other end of the first pump;

[0010] a second pump, one end of which is connected to the other end of the alkali waste liquid pretreatment device;

[0011] An acid-base neutralization device is connected to the other end of the second pump, and a pH detection unit is provided in the acid-base neutralization device.

[0012] According to the system for adding alkali waste liquid to acid waste liquid in the above embodiment of the utility model, it includes an alkali waste liquid collection device, a first pump, an alkali waste liquid pretreatment device, a second pump and an acid-base neutralization device, wherein the alkali waste liquid collection device is used to collect the alkali waste liquid generated in the texturing process and alkali polishing process of solar cell sheets; the first pump is used to transfer the alkali waste liquid to the alkali waste liquid pretreatment device, and the alkali waste liquid pretreatment device is used to pre-treat the hydrogen peroxide and process additives in the alkali waste liquid; the second pump is used to transfer the pre-treated alkali waste liquid to the acid-base neutralization device, and the acid-base neutralization device is used for neutralization reaction between the alkali waste liquid and the acid waste liquid. Thus, the system can safely and stably introduce the alkali waste liquid generated in the texturing process and alkali polishing process of solar cell sheets into the acid waste liquid treatment process of photovoltaic monocrystalline silicon wafers for treatment, thereby solving the problem of high cost of acid waste liquid treatment of monocrystalline silicon wafers, solving the problem of high cost of alkali waste liquid treatment of solar cells, solving the problem of high cost of construction of wastewater complete system, and significantly reducing the treatment cost of alkali waste liquid and acid waste liquid.

[0013] In addition, the system for adding alkali waste liquid to acid waste liquid according to the above embodiment of the utility model may also have the following additional technical features:

[0014] In some embodiments of the present invention, the system further comprises: a liquid level meter, wherein the liquid level meter is arranged in the alkali waste liquid collecting device.

[0015] In some embodiments of the present invention, the system further comprises: a first valve, which is arranged on a pipeline between the second pump and the acid-base neutralization device.

[0016] In some embodiments of the present invention, the system further includes: a PLC control unit, which is respectively connected to the liquid level meter, the first pump, the second pump, the pH detection unit and the first valve through electrical signals.

[0017] In some embodiments of the present invention, the system further comprises: a second valve, which is arranged on a pipeline between the alkali waste liquid collecting device and the first pump.

[0018] In some embodiments of the present invention, the system further comprises: a third valve, wherein the third valve is disposed on the pipeline between the second valve and the first pump.

[0019] In some embodiments of the present invention, the system further comprises: a check valve, which is arranged on a pipeline between the first pump and the alkali waste liquid pretreatment device.

[0020] In some embodiments of the present invention, the system further comprises: a first diameter-changing device, wherein the first diameter-changing device is arranged on the pipeline between the first pump and the check valve.

[0021] In some embodiments of the present invention, the system further comprises: a pressure detection unit, wherein the pressure detection unit is arranged on the pipeline between the first diameter reducing device and the check valve.

[0022] In some embodiments of the utility model, the alkaline waste liquid collection device is an alkaline waste liquid collection tank; and / or, the alkaline waste liquid pretreatment device is an alkaline waste liquid pretreatment tank; and / or, the acid-base neutralization device is an acid-base neutralization tank; and / or, the pH detection unit is a pH detection instrument.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 It is a structural schematic diagram of a system for adding alkaline waste liquid into acid waste liquid according to an embodiment of the utility model.

[0026] Reference numerals:

[0027] 1-liquid level meter, 2-alkaline waste liquid collecting device, 3-second valve, 4-third valve, 5-first pump, 6-first reducing device, 7-pressure detection unit, 8-check valve, 9-alkaline waste liquid pretreatment device, 10-second pump, 11-first valve, 12-acid-base neutralization device, 13-PLC control unit. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] The utility model proposes a system for adding alkali waste liquid to acid waste liquid. Figure 1 , including: an alkali waste liquid collection device 2, a first pump 5, an alkali waste liquid pretreatment device 9, a second pump 10 and an acid-base neutralization device 12, wherein the alkali waste liquid collection device 2 is used to collect alkali waste liquid, one end of the first pump 5 is connected to the alkali waste liquid collection device 2, one end of the alkali waste liquid pretreatment device 9 is connected to the other end of the first pump 5, one end of the second pump 10 is connected to the other end of the alkali waste liquid pretreatment device 9, the acid-base neutralization device 12 is connected to the other end of the second pump 10, and a pH detection unit (not shown in the figure) is provided in the acid-base neutralization device 12. Thus, the system can safely and stably introduce the alkali waste liquid generated in the texturing process and alkali polishing process of the solar cell into the acid waste liquid treatment process of the photovoltaic single crystal silicon wafer for treatment, thereby solving the problem of high cost of acid waste liquid treatment of the single crystal silicon wafer, solving the problem of high cost of alkali waste liquid treatment of the solar cell, solving the problem of high cost of wastewater complete system construction, and significantly reducing the treatment cost of alkali waste liquid and acid waste liquid.

[0034] The principle of the system for adding alkali waste liquid to acid waste liquid proposed by the utility model to achieve the above beneficial effects is described in detail below:

[0035] In the related art, the alkaline waste liquid generated during the texturing process and alkaline polishing process of solar cells and the acid waste liquid generated during the production of photovoltaic monocrystalline silicon wafers need to be treated separately, which has high treatment costs and the cost of building a complete set of wastewater treatment systems is also high.

[0036] In view of this, the utility model provides a system for adding alkaline waste liquid to acid waste liquid, which introduces the alkaline waste liquid generated in the texturing process and alkali polishing process of solar cell sheets into the acid waste liquid treatment process of photovoltaic monocrystalline silicon wafers for treatment, thereby solving the following problems: 1) The problem of high cost of acid waste liquid treatment of monocrystalline silicon wafers is solved, and the alkaline waste liquid generated in the texturing process and alkali polishing process of solar cell sheets can replace the 30% industrial-grade NaOH solution required in the acid waste liquid treatment process of monocrystalline silicon wafers, and avoids the transportation risk of NaOH solution suppliers and the risk of on-site personnel filling hazardous chemicals; 2) The problem of high cost of alkaline waste liquid treatment of batteries is solved, and the 50% industrial-grade H2SO4 solution required in the wastewater treatment process of battery factories is reduced, and the transportation risk of third-party pharmaceutical suppliers and the risk of on-site personnel filling hazardous chemicals are reduced; 3) The problem of high cost of wastewater complete system construction is solved, and the company's construction cost is reduced.

[0037] Specifically, the system for adding alkaline waste liquid to acid waste liquid provided by the utility model comprises an alkaline waste liquid collecting device 2, a first pump 5, an alkaline waste liquid pretreatment device 9, a second pump 10 and an acid-base neutralization device 12, wherein the alkaline waste liquid collecting device 2 is used to collect the alkaline waste liquid generated during the texturing process and the alkali polishing process of the solar cell, that is, the alkaline waste liquid generated during the texturing process and the alkali polishing process of the solar cell is concentrated in the alkaline waste liquid collecting device 2; the first pump 5 is then used to transport the alkaline waste liquid to the alkaline waste liquid pretreatment device 9, which contains ferrous sulfate and a flocculant to pre-treat the hydrogen peroxide and process additives in the alkaline waste liquid; and the second pump 10 is then used to transport the pretreated alkaline waste liquid to the acid-base neutralization device 12 to undergo a neutralization reaction with the acid waste liquid of the photovoltaic single crystal silicon wafer in the acid-base neutralization device 12. The pH detection unit in the acid-base neutralization device 12 is used to monitor the pH of the neutralization liquid in the acid-base neutralization device 12. When the pH is acidic, the control system adds alkaline waste liquid to the acid-base neutralization device 12. When the pH is alkaline, the addition of alkaline waste liquid is suspended, and the control system adds acid waste liquid to the acid-base neutralization device 12.

[0038] It should be noted that in the treatment of acid waste liquid from photovoltaic monocrystalline silicon wafers, after the acid-base neutralization treatment, flocculation and precipitation are required to obtain a supernatant, and then the supernatant enters the biochemical system to remove pollutants such as carbon, nitrogen, and phosphorus. However, the alkaline waste liquid generated during the texturing process and alkali polishing process of solar cell wafers contains a large amount of hydrogen peroxide and process additives. Therefore, before the alkaline waste liquid generated during the texturing process and alkali polishing process of solar cell wafers is added to the acid waste liquid of photovoltaic monocrystalline silicon wafers, the hydrogen peroxide and process additives in the alkaline waste liquid need to be removed first. Therefore, the utility model arranges an alkaline waste liquid pretreatment device 9 before the acid-base neutralization device 12, and adds ferrous sulfate to the alkaline waste liquid pretreatment device 9 to oxidize and reduce the hydrogen peroxide in the alkaline waste liquid. At the same time, flocculants such as polyaluminum chloride are added to the alkaline waste liquid pretreatment device 9 to flocculate the process additives in the alkaline waste liquid. Therefore, before the alkaline waste liquid is added to the acid waste liquid of photovoltaic monocrystalline silicon wafers, the hydrogen peroxide and process additives in the alkaline waste liquid are first removed to avoid adverse effects on the process after the acid-base neutralization treatment, so that the alkaline waste liquid generated during the texturing process and alkali polishing process of solar cell wafers can be safely and stably used in the acid waste liquid treatment process of photovoltaic monocrystalline silicon wafers.

[0039] The inventors have found that if the hydrogen peroxide in the alkaline waste liquid is not removed before the acid-base neutralization treatment, the hydrogen peroxide will enter the acid waste liquid treatment process of the photovoltaic monocrystalline silicon wafers together with the alkaline waste liquid, causing the hydrogen peroxide to enter the biochemical system after the acid-base neutralization treatment, thereby causing the bacteria in the biochemical system to be poisoned and die, resulting in excessive carbon, nitrogen and phosphorus content in the discharged wastewater. If the process additives in the alkaline waste liquid are not removed before the acid-base neutralization treatment, the process additives will enter the acid waste liquid treatment process of the photovoltaic monocrystalline silicon wafers together with the alkaline waste liquid, causing the process additives to enter the flocculation and precipitation system after the acid-base neutralization treatment, thereby causing large fluctuations in the flocculation and precipitation process.

[0040] As some specific examples, the alkali waste liquid collection device 2 can be an alkali waste liquid collection tank; and / or, the alkali waste liquid pretreatment device 9 can be an alkali waste liquid pretreatment tank; and / or, the acid-base neutralization device 12 can be an acid-base neutralization tank; and / or, the pH detection unit can be a pH detection instrument.

[0041] According to some specific embodiments of the present invention, Figure 1 The system further comprises: a liquid level meter 1 , which is arranged in the alkali waste liquid collecting device 2 and is used to monitor the liquid level of the alkali waste liquid in the alkali waste liquid collecting device 2 .

[0042] According to some more specific embodiments of the present invention, refer to the attached Figure 1 The system further includes: a first valve 11, which is disposed on a pipeline between the second pump 10 and the acid-base neutralization device 12, and is used to control whether to transfer the pretreated alkali waste liquid to the acid-base neutralization device 12. As a specific example, the first valve 11 may be a pneumatic valve.

[0043] According to some specific embodiments of the present invention, Figure 1The system further includes: a PLC control unit 13, which is connected to the liquid level meter 1, the first pump 5, the second pump 10, the pH detection unit and the first valve 11 through electrical signals. The liquid level meter 1 transmits the liquid level information of the alkali waste liquid in the alkali waste liquid collecting device 2 to the PLC control unit 13, and the PLC control unit 13 determines whether to start the first pump 5 according to the liquid level information of the alkali waste liquid in the alkali waste liquid collecting device 2. For example, when the alkali waste liquid in the alkali waste liquid collecting device 2 reaches a preset liquid level, the first pump 5 is started to transfer the alkali waste liquid to the alkali waste liquid pretreatment device 9, which contains ferrous sulfate and flocculants to pre-treat the hydrogen peroxide and process additives in the alkali waste liquid. The pH detection unit transmits the pH information of the neutralized liquid in the acid-base neutralization device 12 to the PLC control unit 13. The PLC control unit 13 decides whether to open the second pump 10 and the first valve 11 according to the pH value of the neutralized liquid in the acid-base neutralization device 12. For example, when the pH value of the neutralized liquid in the acid-base neutralization device 12 is less than 7, the second pump 10 and the first valve 11 are controlled to be opened, and the pretreated alkaline waste liquid is transferred to the acid-base neutralization device 12 to undergo a neutralization reaction with the acid waste liquid of the photovoltaic single crystal silicon wafer in the acid-base neutralization device 12 until the pH value of the neutralized liquid in the acid-base neutralization device 12 is equal to 7.

[0044] According to some specific embodiments of the present invention, Figure 1 The system further includes: a second valve 3, which is disposed on the pipeline between the alkali waste liquid collection device 2 and the first pump 5, and is used to control the circulation of the alkali waste liquid between the alkali waste liquid collection device 2 and the first pump 5. As a specific example, the second valve 3 can be a worm gear butterfly valve.

[0045] According to some specific embodiments of the present invention, Figure 1 The system further includes: a third valve 4, which is arranged on the pipeline between the second valve 3 and the first pump 5, and is used to control the circulation of the alkali waste liquid between the second valve 3 and the first pump 5. When a device downstream of the third valve 4 fails, the third valve 4 can be closed to repair the failed device downstream of the third valve 4; at the same time, the second valve 3 is opened to guide the alkali waste liquid in the alkali waste liquid collection device 2 to another place for treatment. As a specific example, the third valve 4 can be a butterfly valve.

[0046] According to some specific embodiments of the present invention, Figure 1 The system further comprises: a check valve 8, which is arranged on the pipeline between the first pump 5 and the alkali waste liquid pretreatment device 9, and is used to prevent the alkali waste liquid from flowing back.

[0047] According to some specific embodiments of the present invention, Figure 1The system further includes: a first diameter reducing device 6, which is arranged on the pipeline between the first pump 5 and the check valve 8. Since the diameter of the first pump 5 is small, the first diameter reducing device 6 can be used to increase the diameter of the pipeline after passing through the first pump 5. As a specific example, the first diameter reducing device 6 can be a UPVC diameter reducing device.

[0048] Similarly, the system further includes: a second diameter reducing device (not shown in the figure), which is arranged on the pipeline between the second pump 10 and the first valve 11. Since the diameter of the second pump 10 is small, the second diameter reducing device can be used to increase the diameter of the pipeline after passing through the second pump 10. As a specific example, the second diameter reducing device can be a UPVC diameter reducing device.

[0049] According to some specific embodiments of the present invention, Figure 1 The system further includes: a pressure detection unit 7, which is disposed on the pipeline between the first diameter reducing device 6 and the check valve 8, and is used to monitor the pressure of the alkali waste liquid after passing through the first diameter reducing device 6. As a specific example, the pressure detection unit 7 can be a mechanical pressure gauge.

[0050] As some specific examples, the third valve 4, the first pump 5, the first diameter reducing device 6, the pressure detection unit 7, the check valve 8 and the second pump 10 respectively include two groups, one of which is used and the other can be used as a backup.

[0051] As some specific examples, the first valve 11 and the acid-base neutralization device 12 include multiple groups (for example, four groups), and the multiple groups of acid-base neutralization devices can perform acid-base neutralization treatment at the same time, thereby improving efficiency.

[0052] In addition, the alkaline waste liquid generated during the texturing process and alkaline polishing process of solar cells is alkaline corrosive, the water temperature is about 40°C, the pH value is greater than 12, the conveying pipeline, the first pump 5, the second pump 10, and various valves can be made of anti-corrosion and alkali-resistant materials to meet the corresponding waterproof level. The pipeline material should be UPVC chemical, SCH80, etc., and the power supply is 380V, the power is required to be not less than 15kw, and the CDA pressure must not be less than 3kg.

[0053] The process of using the above system to introduce the alkaline waste liquid generated in the texturing process and alkaline polishing process of solar cell sheets into the acid waste liquid treatment process of photovoltaic monocrystalline silicon wafers for treatment is as follows:

[0054] The alkali waste liquid generated during the texturing process and alkali polishing process of the solar cell is concentrated in the alkali waste liquid collecting device 2, and the liquid level of the alkali waste liquid in the alkali waste liquid collecting device 2 is monitored by the liquid level meter 1. The liquid level meter 1 transmits the liquid level information of the alkali waste liquid in the alkali waste liquid collecting device 2 to the PLC control unit 13. When the alkali waste liquid in the alkali waste liquid collecting device 2 reaches a preset liquid level, the first pump 5 is turned on to transfer the alkali waste liquid to the alkali waste liquid pretreatment device 9. The alkali waste liquid pretreatment device 9 contains ferrous sulfate and flocculant to pre-treat the hydrogen peroxide and process additives in the alkali waste liquid. The pH of the neutralized liquid in the acid-base neutralization device 12 is then monitored by a pH detection unit. When the pH is acidic, the PLC control unit 13 controls the second pump 10 and the first valve 11 to open, and the pretreated alkaline waste liquid is transferred to the acid-base neutralization device 12 to undergo a neutralization reaction with the acid waste liquid of the photovoltaic single crystal silicon wafer in the acid-base neutralization device 12 until the pH value of the neutralized liquid in the acid-base neutralization device 12 is equal to 7.

[0055] Furthermore, after the alkaline waste liquid generated during the texturing process and alkaline polishing process of the solar cell and the acid waste liquid of the photovoltaic monocrystalline silicon wafer are neutralized, the neutralized liquid needs to be transferred to the flocculation sedimentation system for flocculation sedimentation to obtain the supernatant, and then the supernatant is transferred to the biochemical system to remove pollutants such as carbon, nitrogen, and phosphorus. It can only be discharged after meeting the emission standards.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0057] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A system for adding alkali waste liquid to acid waste liquid, characterized in that: include: An alkali waste liquid collecting device, wherein the alkali waste liquid collecting device is used to collect alkali waste liquid, wherein the alkali waste liquid contains hydrogen peroxide and process additives; a first pump, one end of which is connected to the alkali waste liquid collecting device; an alkali waste liquid pretreatment device, one end of which is connected to the other end of the first pump; a second pump, one end of which is connected to the other end of the alkali waste liquid pretreatment device; An acid-base neutralization device is connected to the other end of the second pump, and a pH detection unit is provided in the acid-base neutralization device.

2. The system for adding alkali waste liquid to acid waste liquid according to claim 1, characterized in that: Also includes: A liquid level meter is arranged in the alkali waste liquid collecting device.

3. The system for adding alkali waste liquid to acid waste liquid according to claim 2, characterized in that: Also includes: A first valve is arranged on a pipeline between the second pump and the acid-base neutralization device.

4. The system for adding alkali waste liquid to acid waste liquid according to claim 3, characterized in that: Also includes: A PLC control unit is connected to the liquid level meter, the first pump, the second pump, the pH detection unit and the first valve respectively through electrical signals.

5. The system for adding alkali waste liquid to acid waste liquid according to any one of claims 1 to 4, characterized in that: Also includes: A second valve is arranged on a pipeline between the alkali waste liquid collecting device and the first pump.

6. The system for adding alkali waste liquid to acid waste liquid according to claim 5, characterized in that: Also includes: A third valve is disposed on a pipeline between the second valve and the first pump.

7. The system for adding alkali waste liquid to acid waste liquid according to any one of claims 1 to 4, characterized in that: Also includes: A check valve is arranged on the pipeline between the first pump and the alkali waste liquid pretreatment device.

8. The system for adding alkali waste liquid to acid waste liquid according to claim 7, characterized in that: Also includes: A first diameter reducing device is provided on the pipeline between the first pump and the check valve.

9. The system for adding alkali waste liquid to acid waste liquid according to claim 8, characterized in that: Also includes: A pressure detection unit is provided on the pipeline between the first diameter reducing device and the check valve.

10. The system for adding alkali waste liquid to acid waste liquid according to any one of claims 1 to 4, characterized in that: The alkali waste liquid collection device is an alkali waste liquid collection tank; And / or, the alkaline waste liquid pretreatment device is an alkaline waste liquid pretreatment tank; And / or, the acid-base neutralization device is an acid-base neutralization tank; And / or, the pH detection unit is a pH detection instrument.

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