Method for treating papermaking chemimechanical pulp wastewater

Abstract

The invention provides a treatment method of papermaking chemimechanical pulp wastewater. The treatment method comprises the following steps: carrying out air flotation treatment on the papermaking chemimechanical pulp wastewater by using an air flotation machine, and adding a chemical agent into the air flotation machine; mixing the chemimechanical pulp wastewater subjected to air flotation treatment with paper machine wastewater according to a preset proportion; and adding a flocculating agent into the mixed wastewater for precipitation. According to the papermaking chemimechanical pulp wastewater treatment method provided by the embodiment of the invention, the air flotation treatment section is added before preliminary precipitation, the chemical agent is added in the air flotation treatment process to adsorb suspended substances in the chemimechanical pulp wastewater, and adsorbed floccules are discharged through the air flotation section, so that the phenomenon of'floating sludge 'does not occur any more when the adsorbed floccules are mixed with paper machine wastewater subsequently; further, a flocculating agent can be continuously added into the primary sedimentation tank for flocculation and sedimentation, and a subsequent treatment process is carried out; the treatment method can greatly reduce the treatment pressure of the wastewater system and improve the treatment effect of the wastewater treatment system.

Description

Technical Field

[0001] This application relates to the technical field of wastewater treatment, specifically to a method for treating papermaking chemimechanical pulp wastewater. Background Technology

[0002] Eucalyptus is one of my country's important fast-growing tree species, possessing advantages such as a short growth cycle, good fiber morphology, and strong adaptability, making it a crucial fiber raw material for chemimechanical pulping in my country. Vigorously developing eucalyptus chemimechanical pulping is of great significance to the healthy and sustainable development of my country's paper industry. The wastewater generated during eucalyptus chemimechanical pulping has poor biodegradability and is difficult to biodegrade. The mainstream process includes preliminary sedimentation, hydrolysis, anaerobic treatment, aerobic treatment, Fenton reaction, and final discharge. In treating eucalyptus chemimechanical pulping wastewater, COD is the main limiting pollutant. However, conventional chemimechanical pulping wastewater treatment methods are prone to "floating sludge" phenomena, severely affecting the pretreatment effect of chemimechanical pulping wastewater and significantly contributing to the decline in the treatment capacity of biological systems. Summary of the Invention

[0003] The first aspect of this application provides a method for treating papermaking chemimechanical pulp wastewater, the method comprising: The papermaking chemimechanical pulp wastewater is treated by flotation, and chemicals are added to the flotation machine at the same time. The chemical mechanical pulp wastewater after air flotation treatment is mixed with paper machine wastewater according to a preset ratio; Add flocculant to the mixed wastewater to induce sedimentation.

[0004] In some optional embodiments, in the step of using an air flotation machine to treat papermaking chemimechanical pulp wastewater while adding chemicals to the air flotation machine, the chemicals include any one or more combinations of polyacrylamide, polyaluminum chloride, and bentonite.

[0005] In some optional embodiments, the chemical includes polyacrylamide, and the amount of polyacrylamide added is 5-30 ppm.

[0006] In some optional embodiments, the chemical includes polyaluminum chloride, and the amount of polyaluminum chloride added is 200-1000 ppm.

[0007] In some optional embodiments, the chemical includes bentonite, with an addition amount of 200-800 ppm.

[0008] In some optional embodiments, in the step of using an air flotation machine to treat papermaking chemimechanical pulp wastewater while adding chemicals to the air flotation machine, the chemicals include cationic polyacrylamide and bentonite; the amount of cationic polyacrylamide added is 5-30 ppm, and the amount of bentonite added is 200-800 ppm.

[0009] In some optional embodiments, the temperature of the papermaking chemimechanical pulp wastewater being treated is 55 ± 5 degrees Celsius.

[0010] In some optional embodiments, the treatment method further includes detecting the temperature of the papermaking chemimechanical pulp wastewater being treated and adjusting the dosage of chemicals based on the water temperature.

[0011] In some optional embodiments, in the step of adjusting the dosage of chemicals according to the water temperature, if the water temperature of the papermaking chemimechanical pulp wastewater being treated is higher than 60 degrees Celsius, the dosage of chemicals is increased; if the water temperature of the papermaking chemimechanical pulp wastewater being treated is lower than 40 degrees Celsius, the dosage of chemicals is reduced.

[0012] In some optional embodiments, in the step of mixing the chemimechanical pulp wastewater after air flotation treatment with the paper machine wastewater in a preset ratio, the chemimechanical pulp wastewater after air flotation treatment with the paper machine wastewater is mixed in a ratio of (1±0.1):(2±0.1).

[0013] The papermaking chemimechanical pulp wastewater treatment method provided in this application embodiment adds an air flotation treatment section before the initial sedimentation, and adds chemicals during the air flotation treatment to adsorb suspended matter in the chemimechanical pulp wastewater. The adsorbed flocs are discharged through the air flotation section, and when mixed with paper machine wastewater, the "floating mud" phenomenon no longer occurs. Then, flocculants can be added to the primary sedimentation tank for flocculation and sedimentation, and subsequent treatment processes can be carried out. This treatment method can significantly reduce the treatment pressure of the wastewater system and improve the treatment effect of the wastewater treatment system. Using the papermaking chemimechanical pulp wastewater treatment method in this embodiment, the COD, turbidity and SS of the treated wastewater are significantly reduced. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic flowchart of an embodiment of the method for treating papermaking chemimechanical pulp wastewater according to this application; Figure 2This is a schematic flowchart of another embodiment of the method for treating papermaking chemimechanical pulp wastewater according to this application. Detailed Implementation

[0016] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0017] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0018] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0019] The papermaking chemimechanical pulp wastewater treatment method in this embodiment adds an air flotation stage before primary sedimentation. Bentonite, PAC, PAM, and other chemicals are used to adsorb suspended matter in the wastewater, and the adsorbed flocs are discharged through the air flotation stage. Subsequently, the wastewater is mixed with paper machine wastewater at a preset ratio, and an anionic flocculant is added to the primary sedimentation tank for flocculation and sedimentation. The supernatant from the primary sedimentation tank then undergoes hydrolysis, anaerobic treatment, aerobic treatment, Fenton reaction, and final discharge. Compared to traditional chemimechanical pulp treatment processes, this process has a beneficial effect on reducing the pressure on the biological system.

[0020] With increasing demands for chemimechanical pulp strength, the amount of chemicals such as hydrogen peroxide and liquid alkali added during the pulping process is constantly increasing. This has led to a surge in the average COD of chemimechanical pulp wastewater to around 18,000-20,000 mg / L, with a maximum of 24,000 mg / L. Compared to traditional chemimechanical pulp wastewater, it exhibits higher COD, turbidity, suspended solids (SS), and residual hydrogen peroxide, making treatment more challenging. Ineffective pretreatment of chemimechanical pulp wastewater can directly cause abnormalities in the biological system, easily leading to risks such as exceeding wastewater discharge standards.

[0021] In view of this, this application provides a method for treating papermaking chemimechanical pulp wastewater. Please refer to [link to relevant documentation]. Figure 1 , Figure 1 This is a schematic flowchart of an embodiment of the method for treating papermaking chemimechanical pulp wastewater according to this application. The method for treating papermaking chemimechanical pulp wastewater in this embodiment includes, but is not limited to, the following steps.

[0022] Step S100: The papermaking chemimechanical pulp wastewater is treated by flotation using an air flotation machine, and chemicals are added to the air flotation machine at the same time.

[0023] In this step, the flotation machine can be a CQJ type ultra-efficient shallow flotation water purifier with a maximum treatment capacity of 417m³. 3 / h, return flow rate is 100m 3 / h, dissolved air water pressure is 400 bar.

[0024] In this embodiment, the chemical agents added during the flotation treatment of papermaking chemimechanical pulp wastewater in the flotation machine include polyacrylamide (PAM), polyaluminum chloride (PAC), and bentonite (a non-metallic mineral with montmorillonite as its main mineral component; montmorillonite has a 2:1 crystal structure consisting of two silicon-oxygen tetrahedra sandwiching a layer of aluminum-oxygen octahedra; due to the presence of certain cations such as Cu, Mg, Na, and K in the layered structure formed by montmorillonite cells, and the unstable interaction between these cations and montmorillonite cells, it is easily exchanged by other cations, thus exhibiting good ion exchange properties). Optionally, the amount of polyacrylamide added is 5-30 ppm, specifically values ​​such as 5 ppm, 8 ppm, 10 ppm, 15 ppm, 16 ppm, 20 ppm, 22 ppm, 27 ppm, and 30 ppm. The addition amount of polyaluminum chloride is 200-1000 ppm, specifically 200 ppm, 250 ppm, 300 ppm, 400 ppm, 500 ppm, 800 ppm, 1000 ppm, etc. The addition amount of bentonite is 200-800 ppm, specifically 200 ppm, 230 ppm, 250 ppm, 300 ppm, 500 ppm, 600 ppm, 650 ppm, 800 ppm, etc.

[0025] Since the temperature of the papermaking chemimechanical pulp wastewater being treated affects the reaction of the chemicals, the amount of chemicals added in this embodiment is based on the temperature of the papermaking chemimechanical pulp wastewater being treated being 55±5 degrees Celsius.

[0026] The laboratory-scale air flotation simulation test method for chemimechanical pulp wastewater is as follows: Prepare a high-pressure spray bottle, fill it with water to the mark, and aerate it. Prepare a 500ml beaker and take 400ml of chemimechanical pulp wastewater sample into it. Add PAC (polyaluminum chloride), bentonite, and PAM (polyacrylamide) to the beaker, stirring and mixing for 1 minute after each addition, with a 1-minute interval between each addition. Aim the nozzle of the spray bottle at the surface of the liquid in the beaker and release a small amount of dissolved air water for 1-2 seconds, repeating 3 times. Small bubbles should be generated on the surface of the liquid during release. After 1 minute, observe the surface and side conditions of the sample. Take the middle layer of liquid for COD, SS, turbidity, and other tests. The test results are shown in the table below.

[0027]

[0028] The following conclusions can be drawn from the table above: PAMs No. 1 and No. 2 are cationic polyacrylamides, while PAMs No. 3 and No. 4 are anionic polyacrylamides. Modified bentonite exhibits strong adsorption and cation exchange properties.

[0029] Since the temperature of the chemical pulp wastewater exceeds 55℃, it has an adverse effect on the coagulation effect of PAC. PAM No. 1 and No. 4 have poor flocculation effect under high temperature environment, and the flocs in Example 1 and Example 4 are small.

[0030] In Example 3, the use of PAM No. 3 within an extended temperature range resulted in a certain flocculation effect on the chemimechanical slurry wastewater. Combined with the adsorption effect of bentonite (which exhibits good adsorption capacity at 55℃), the floc size was moderate. The suspended solids (SS) in the chemimechanical slurry wastewater decreased from 2419 mg / L to 1230 mg / L, and the turbidity decreased from 1378 NTU to 898 NTU.

[0031] In the preferred embodiment 2 of the flotation treatment scheme for chemical mechanical slurry wastewater, bentonite + No. 2 PAM is used for treatment. First, the strong adsorption and strong cation exchange performance of bentonite are used to adsorb the suspended solids in the chemical mechanical slurry wastewater. Then, flocculation is carried out by No. 2 PAM (cationic polyacrylamide). The SS of the chemical mechanical slurry wastewater decreased from 2419 mg / L to 679 mg / L, and the turbidity decreased from 1378 NTU to 662 NTU.

[0032] Please continue reading. Figure 1 In this embodiment, the method for treating papermaking chemimechanical pulp wastewater further includes step S200, which involves mixing the chemimechanical pulp wastewater after air flotation treatment with paper machine wastewater in a preset ratio.

[0033] In step S200, the chemical mechanical pulp wastewater after air flotation treatment and the paper machine wastewater can be mixed and diluted in a ratio of (1±0.1):(2±0.1). The specific ratio of chemical mechanical pulp wastewater to paper machine wastewater can be 0.9:2, 0.9:2.1, 1:2, 1:2.1, 1.1:2.1, etc.

[0034] The daily treatment capacity of chemical pulp wastewater is 10,000 m³. 3 Around 55℃ in summer, the wastewater temperature of the chemimechanical pulp exceeds 55℃, and the wastewater volume of the paper machine is 20,000 m³. 3 After dilution, subsequent initial sedimentation treatment is carried out.

[0035] Please continue reading. Figure 1 In this embodiment, the method for treating papermaking chemimechanical pulp wastewater further includes step S300, which involves adding a flocculant to the mixed wastewater for sedimentation.

[0036] In this step, the mixed wastewater may be placed in a primary sedimentation tank, and then an anionic flocculant may be added to the mixed wastewater for flocculation and sedimentation. Subsequent wastewater treatment steps may also include hydrolysis, anaerobic treatment, aerobic treatment, secondary sedimentation, Fenton reaction, coagulation sedimentation, and final discharge. The subsequent treatment processes do not involve improvements to this patent and are within the understanding of those skilled in the art, and will not be detailed here.

[0037] The papermaking chemimechanical pulp wastewater treatment method in this embodiment adds an air flotation treatment section before the initial sedimentation, and adds chemicals during the air flotation treatment to adsorb suspended matter in the chemimechanical pulp wastewater. The adsorbed flocs are discharged through the air flotation section, and when mixed with paper machine wastewater, the "floating mud" phenomenon no longer occurs. Then, flocculants can be added to the primary sedimentation tank for flocculation and sedimentation, and subsequent treatment processes can be carried out. This treatment method can significantly reduce the treatment pressure of the wastewater system and improve the treatment effect of the wastewater treatment system. Using the papermaking chemimechanical pulp wastewater treatment method in this embodiment, the COD, turbidity, and SS of the treated wastewater are significantly reduced.

[0038] Please see Figure 2 , Figure 2 This is a schematic flowchart of another embodiment of the method for treating papermaking chemimechanical pulp wastewater according to this application. The method for treating papermaking chemimechanical pulp wastewater in this embodiment includes, but is not limited to, the following steps.

[0039] Step S100: The papermaking chemimechanical pulp wastewater is treated by flotation using an air flotation machine, and chemicals are added to the air flotation machine at the same time.

[0040] In this step, the flotation machine can be a CQJ type ultra-efficient shallow flotation water purifier with a maximum treatment capacity of 417m³. 3 / h, return flow rate is 100m 3 / h, dissolved air water pressure is 400 bar.

[0041] In this embodiment, the chemical agents added during the flotation treatment of papermaking chemimechanical pulp wastewater in the flotation machine include polyacrylamide (PAM), polyaluminum chloride (PAC), and bentonite (a non-metallic mineral with montmorillonite as its main mineral component; montmorillonite has a 2:1 crystal structure consisting of two silicon-oxygen tetrahedra sandwiching a layer of aluminum-oxygen octahedra; due to the presence of certain cations such as Cu, Mg, Na, and K in the layered structure formed by montmorillonite cells, and the unstable interaction between these cations and montmorillonite cells, it is easily exchanged by other cations, thus exhibiting good ion exchange properties). Optionally, the amount of polyacrylamide added is 5-30 ppm, specifically values ​​such as 5 ppm, 8 ppm, 10 ppm, 15 ppm, 16 ppm, 20 ppm, 22 ppm, 27 ppm, and 30 ppm. The addition amount of polyaluminum chloride is 200-1000 ppm, specifically 200 ppm, 250 ppm, 300 ppm, 400 ppm, 500 ppm, 800 ppm, 1000 ppm, etc. The addition amount of bentonite is 200-800 ppm, specifically 200 ppm, 230 ppm, 250 ppm, 300 ppm, 500 ppm, 600 ppm, 650 ppm, 800 ppm, etc.

[0042] Since the temperature of the papermaking chemimechanical pulp wastewater being treated affects the reaction of the chemicals, the treatment method in this embodiment further includes step S400, detecting the water temperature of the papermaking chemimechanical pulp wastewater being treated, and step S500, adjusting the dosage of chemicals according to the water temperature.

[0043] In step S500, if the temperature of the treated papermaking chemimechanical pulp wastewater is higher than 60 degrees Celsius, the dosage of the chemical is increased; if the temperature is lower than 40 degrees Celsius, the dosage of the chemical is reduced. For example, the dosage ranges for the three chemicals are: polyacrylamide 5-30 ppm, polyaluminum chloride 200-1000 ppm, and bentonite 200-800 ppm. The overall dosage range remains constant within this range. The specific dosage is adjusted according to the temperature. For instance, if the temperature of the treated papermaking chemimechanical pulp wastewater is 62 degrees Celsius (higher than 60 degrees Celsius), the dosage of the three chemicals (any one or two of them) can be within a larger range. The dosage is as follows: 10-30 ppm for polyacrylamide, 500-1000 ppm for polyaluminum chloride, and 400-800 ppm for bentonite. If the water temperature for treating papermaking chemimechanical pulp wastewater is 35 degrees Celsius (below 40 degrees Celsius), the dosage of the above three chemicals (any one or two of them) can be in a wider range, specifically: 5-15 ppm for polyacrylamide, 200-600 ppm for polyaluminum chloride, and 200-500 ppm for bentonite.

[0044] The laboratory-scale air flotation simulation test method for chemimechanical pulp wastewater is as follows: Prepare a high-pressure spray bottle, fill it with water to the mark, and aerate it. Prepare a 500ml beaker and take 400ml of chemimechanical pulp wastewater sample into it. Add PAC (polyaluminum chloride), bentonite, and PAM (polyacrylamide) to the beaker, stirring and mixing for 1 minute after each addition, with a 1-minute interval between additions of different chemicals. Aim the nozzle of the spray bottle at the surface of the liquid in the beaker and release a small amount of dissolved air water from the spray bottle for 1-2 seconds, repeating 3 times. Small bubbles should be generated on the surface of the liquid during release. After waiting for 1 minute, observe the surface and side conditions of the sample. Take the middle layer of liquid for COD, SS, turbidity, and other tests. The specific test results are as described in the previous examples and will not be repeated here.

[0045] Please continue reading. Figure 2 In this embodiment, the method for treating papermaking chemimechanical pulp wastewater may also include step S200, which involves mixing the chemimechanical pulp wastewater after air flotation treatment with paper machine wastewater in a preset ratio.

[0046] In step S200, the chemical mechanical pulp wastewater after air flotation treatment and the paper machine wastewater can be mixed and diluted in a ratio of (1±0.1):(2±0.1). The specific ratio of chemical mechanical pulp wastewater to paper machine wastewater can be 0.9:2, 0.9:2.1, 1:2, 1:2.1, 1.1:2.1, etc.

[0047] The daily treatment capacity of chemical pulp wastewater is 10,000 m³. 3 Around 55℃ in summer, the wastewater temperature of the chemimechanical pulp exceeds 55℃, and the wastewater volume of the paper machine is 20,000 m³. 3 After dilution, subsequent initial sedimentation treatment is carried out.

[0048] Please continue reading. Figure 2 In this embodiment, the method for treating papermaking chemimechanical pulp wastewater also includes step S300, which involves adding a flocculant to the mixed wastewater for sedimentation.

[0049] In this step, the mixed wastewater may be placed in a primary sedimentation tank, and then an anionic flocculant may be added to the mixed wastewater for flocculation and sedimentation. Subsequent wastewater treatment steps may also include hydrolysis, anaerobic treatment, aerobic treatment, secondary sedimentation, Fenton reaction, coagulation sedimentation, and final discharge. The subsequent treatment processes do not involve improvements to this patent and are within the understanding of those skilled in the art, and will not be detailed here.

[0050] The treatment method for papermaking chemimechanical pulp wastewater in this application improves upon the preliminary sedimentation in traditional chemimechanical pulp wastewater pretreatment by employing a two-stage treatment process of air flotation and primary sedimentation. Example 2 is the preferred embodiment of the air flotation treatment scheme for chemimechanical pulp wastewater. Compared to single-stage treatment, the COD, turbidity, and SS of the chemimechanical pulp wastewater treated in the two stages are all reduced, thus improving the efficiency of the biochemical system. Actual application test parameters are as follows.

[0051] The parameters for the air flotation process are shown in the table below.

[0052]

[0053] As can be seen from the table above, after the chemical pulp wastewater passes through the air flotation section, the average SS removal rate is 71.68% and the turbidity removal rate is 37.11%, indicating a good air flotation effect.

[0054] The effluent data for the primary sedimentation tank and the secondary sedimentation tank are shown in the table below.

[0055]

[0056] According to the data in Table 2, the addition of the air flotation section significantly reduced the SS and COD in both the primary sedimentation tank effluent and the secondary sedimentation tank effluent.

[0057] Analysis of the characteristics of chemimechanical pulp wastewater revealed that its high residual hydrogen peroxide content easily leads to "floating sludge" during the initial sedimentation stage after mixing with paper machine wastewater. This severely affects the pretreatment effect of the chemimechanical pulp wastewater and is a significant factor contributing to the decline in the treatment capacity of the biological system. The treatment method for papermaking chemimechanical pulp wastewater in this application improves upon the traditional initial sedimentation process by employing a two-stage treatment method: air flotation and primary sedimentation. Simulation of the air flotation dosing scheme showed that the COD, turbidity, and SS of the chemimechanical pulp wastewater treated in the two stages decreased compared to the single-stage treatment, thus improving the effectiveness of the biological system.

[0058] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. A method for treating papermaking chemimechanical pulp wastewater, characterized in that, The processing method includes: The papermaking chemimechanical pulp wastewater is treated by flotation, and chemicals are added to the flotation machine at the same time. The chemical mechanical pulp wastewater after air flotation treatment is mixed with paper machine wastewater according to a preset ratio; Add flocculant to the mixed wastewater to induce sedimentation.

2. The processing method according to claim 1, characterized in that, In the step of using an air flotation machine to treat papermaking chemimechanical pulp wastewater and adding chemical agents to the air flotation machine, the chemical agents include any one or more combinations of polyacrylamide, polyaluminum chloride, and bentonite.

3. The processing method according to claim 2, characterized in that, The chemical includes polyacrylamide, and the amount of polyacrylamide added is 5-30 ppm.

4. The processing method according to claim 2, characterized in that, The chemical includes polyaluminum chloride, and the amount of polyaluminum chloride added is 200-1000 ppm.

5. The processing method according to claim 2, characterized in that, The chemical drug includes bentonite, and the amount of bentonite added is 200-800 ppm.

6. The processing method according to claim 1, characterized in that, In the step of using an air flotation machine to treat papermaking chemimechanical pulp wastewater and adding chemicals to the air flotation machine, the chemicals include cationic polyacrylamide and bentonite; the amount of cationic polyacrylamide added is 5-30 ppm, and the amount of bentonite added is 200-800 ppm.

7. The processing method according to any one of claims 3-6, characterized in that, The temperature of the papermaking chemimechanical pulp wastewater being treated was 55±5 degrees Celsius.

8. The processing method according to claim 1, characterized in that, The treatment method also includes detecting the water temperature of the papermaking chemimechanical pulp wastewater being treated and adjusting the dosage of chemicals according to the water temperature.

9. The processing method according to claim 8, characterized in that, In the step of adjusting the dosage of chemicals according to water temperature, if the water temperature of the papermaking chemimechanical pulp wastewater being treated is higher than 60 degrees Celsius, the dosage of chemicals is increased; if the water temperature of the papermaking chemimechanical pulp wastewater being treated is lower than 40 degrees Celsius, the dosage of chemicals is reduced.

10. The processing method according to claim 1, characterized in that, In the step of mixing the chemimechanical pulp wastewater after air flotation treatment with paper machine wastewater in a preset ratio, the chemimechanical pulp wastewater after air flotation treatment with paper machine wastewater is mixed in a ratio of (1±0.1):(2±0.1).

Images