Wastewater treatment device for polycarboxylic acid production

Abstract

The invention provides a wastewater treatment device for polycarboxylic acid production, and relates to the technical field of wastewater treatment. The wastewater treatment device for polycarboxylic acid production comprises a pretreatment unit, a main treatment unit and a post-treatment unit, the pretreatment unit is used for carrying out initial filtration on wastewater, and the initial filtration comprises screening out large-particle impurities in the wastewater through stirring; the main treatment unit comprises a bio-membrane reactor with microorganisms and is used for degrading organic matters in the wastewater; the post-treatment unit is communicated with the bio-membrane reactor and is used for carrying out secondary filtration and tertiary filtration on the wastewater. Therefore, the wastewater treatment efficiency can be improved, and the concentration of pollutants in the wastewater can be remarkably reduced within a short time.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wastewater treatment, and in particular to a wastewater treatment device for polycarboxylic acid production. Background Art

[0002] Polycarboxylic acid-based high-performance water reducer (liquid) is the third generation of high-performance water reducer developed after ordinary water reducers represented by wood calcium and high-efficiency water reducers represented by naphthalene. It is currently the most cutting-edge, technologically advanced, best application prospect and best comprehensive performance high-efficiency water reducer in the world.

[0003] At present, the wastewater generated in the production process of polycarboxylic acid contains high concentrations of organic matter and inorganic salts. The traditional wastewater treatment methods have problems such as low treatment efficiency, high cost, and secondary pollution. In addition, a large amount of wastewater is generated during the production process of polycarboxylic acid water reducer, which needs to be treated by a wastewater treatment device before it can be discharged. The existing wastewater treatment device has a large amount of residue adhering to its inner wall surface due to the long-term inflow of wastewater, which is inconvenient to clean. Over time, it is easy to cause rust inside the wastewater treatment device, further leading to the problem of low treatment efficiency of the existing polycarboxylic acid wastewater treatment device. Summary of the invention

[0004] The present disclosure provides a highly efficient, low-cost, and environmentally friendly wastewater treatment device for polycarboxylic acid production, so as to at least solve the above technical problems existing in the prior art.

[0005] According to a first aspect of the present disclosure, there is provided a wastewater treatment device for polycarboxylic acid production, comprising: a pretreatment unit, a main treatment unit and a post-treatment unit, wherein the pretreatment unit is used for performing initial filtration on the wastewater, and the initial filtration comprises screening out large particle impurities in the wastewater by stirring; the main treatment unit comprises a biofilm reactor with microorganisms, which is used for degrading organic matter in the wastewater; the post-treatment unit is connected to the biofilm reactor, and is used for performing secondary filtration and tertiary filtration on the wastewater.

[0006] Exemplarily, the filtered liquid containing microorganisms in the biofilm reactor is introduced into the container in advance.

[0007] For example, wastewater from polycarboxylic acid production or reaction gas may be introduced into the pretreatment unit at a preset frequency, and the reaction gas may react with some substances in the wastewater to produce solid residue.

[0008] In some embodiments, the pretreatment unit includes a reactor, a stirring device located inside the reactor, and a vibrating screen connected to the bottom of the reactor, wherein the vibrating screen is used to screen out large particle impurities of pulmonary edema.

[0009] Exemplarily, the reactor is made of stainless steel vessel with surface spray-painted, and the spray-painted treatment can avoid corrosion problems.

[0010] In some embodiments, the stirring device includes a stirring shaft and a stirring blade inserted into the outer periphery of the stirring shaft; there are multiple stirring blades, and the stirring blades are arranged in a staggered manner.

[0011] Exemplarily, the staggered arrangement of multiple stirring blades can improve the stirring efficiency of the wastewater and the solid residue in the wastewater, and can also increase the contact area between the wastewater and the aforementioned corresponding reaction gas, further improving the wastewater reaction efficiency.

[0012] In some embodiments, the pretreatment unit further includes a sewage inlet and a vent, and the sewage inlet and the vent are connected to the reactor via a valve port and a coupling in sequence.

[0013] Exemplarily, the sewage inlet and the vent are two different pipe openings, which can be connected to a valve port through pipelines. The valve port here can be understood as a solenoid valve. The solenoid valve is selected according to actual needs, as long as it is ensured to include at least two inlets and two outlets. It should be noted here that the two outlets are connected to a pipeline respectively, and the two pipelines are constrained to be the same overall structure by bundling, and then connected with the coupling. The coupling is installed on the top surface of the reactor, and the top surface of the reactor has holes connected to the above two pipelines, which facilitates the passage of sewage and reaction gas into the reactor.

[0014] In some embodiments, the primary treatment unit comprises a biofilm reactor, wherein the biofilm reactor comprises wastewater containing specific microorganisms.

[0015] It should be pointed out that polycarboxylic acid generally includes ether polycarboxylic acid water reducers and ester polycarboxylic acid water reducers. For example, polyether and unsaturated acid are polymerized under the action of an initiator to form a finished product (ether polycarboxylic acid water reducer); alcohol ether and unsaturated acid are esterified into macromonomers and then polymerized to form a finished product (ester polycarboxylic acid water reducer). They all introduce branched carboxyl groups into the main chain polyether to form a comb-type polymer.

[0016] In some embodiments, the pretreatment unit is connected to the main treatment unit via a first main pipeline, one end of the first main pipeline extends into the bottom of the reactor, and the other end of the first main pipeline extends into the bottom of the biofilm reactor.

[0017] Exemplarily, a switch valve is further provided between the pre-processing unit and the main processing unit in the first main pipeline, and the switch valve has a built-in control circuit board, which can be used to automatically open and close the passage of the first main pipeline; alternatively, the switch valve is manually operated.

[0018] In some embodiments, the post-treatment unit includes a reaction vessel and a biofilm filtration layer, wherein the biofilm filtration layer is located above the wastewater level in the reaction vessel, and the wastewater from the main treatment unit flows to the bottom of the reaction vessel through the biofilm filtration layer.

[0019] Exemplarily, the biofilm filtration layer can be composed of at least three layers, which are stacked in the longitudinal direction. Considering the filtering effect, the sides of the biofilm filtration layer are completely attached to the inner wall of the reaction vessel, and the reaction vessel is completely cut off along the transverse section to prevent wastewater from flowing directly into the reaction vessel without being filtered.

[0020] In some embodiments, a second main pipeline is connected between the main processing unit and the post-processing unit, one end of the second main pipeline is connected to the bottom surface of the biofilm reactor, the other end of the second main pipeline is connected to the reaction vessel, and the pipe mouth is located above the biofilm filtration layer.

[0021] Exemplarily, a switch valve is further provided between the main processing unit and the post-processing unit in the second main pipeline, and the switch valve has a built-in control circuit board, which can be used to automatically open and close the passage of the second main pipeline; alternatively, the switch valve is manually operated.

[0022] In some embodiments, the post-processing unit also includes an adsorption device, which includes an adsorption layer arranged around its periphery, a pump body arranged inside itself, and a plurality of adsorption inlet pipes and a plurality of adsorption outlet pipes connected between the pump body and the adsorption layer, one of the adsorption inlet pipes being connected to one of the adsorption outlet pipes.

[0023] Exemplarily, both the adsorption inlet pipe and the adsorption outlet pipe are flexible pipes.

[0024] In some embodiments, the adsorption device includes a closed shell, which is covered on the outer periphery of the pump body, and the adsorption layer is located around the closed shell.

[0025] The wastewater treatment device for polycarboxylic acid production disclosed in the present invention is used to filter out large particle impurities after initial filtration through comprehensive application of a pretreatment unit, a main treatment unit and a post-treatment unit, and then degrade organic matter in the wastewater through the main treatment unit, and then perform secondary filtration and tertiary filtration by the post-treatment unit, so that polycarboxylic acid wastewater can be efficiently filtered. In general, the polycarboxylic acid wastewater treatment efficiency is high, and the concentration of pollutants in the wastewater can be significantly reduced in a short time; the overall device has low production cost, simple operation and easy maintenance; the overall device meets environmental protection requirements, does not generate secondary pollution, and is conducive to sustainable development.

[0026] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which: In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0028] Figure 1 A schematic structural diagram of a wastewater treatment device for polycarboxylic acid production according to an embodiment of the present disclosure is shown.

[0029] Description of the numbers in the figure: 001-wastewater treatment device for polycarboxylic acid production; 10-pretreatment unit; 20-main treatment unit; 30-post-treatment unit; 11-reactor; 12-stirring device; 121-stirring shaft; 122-stirring blade; 13-vibrating screen; 14-wastewater inlet; 15-vent; 16-valve port; 17-coupling; 21-biofilm reactor; 22-first main line; 31-reaction vessel; 32-biofilm filtration layer; 33-adsorption device; 331-adsorption layer; 332-pump body; 333-adsorption inlet pipe; 334-adsorption outlet pipe; 34-second main line. DETAILED DESCRIPTION

[0030] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0031] Polycarboxylic acid-based high-efficiency water-reducing agent products can be divided into two categories according to their main chain structures: one category is based on acrylic acid or methacrylic acid as the main chain, with polyethers of different side chain lengths grafted on it. The other category is based on maleic anhydride as the main chain, with polyethers of different side chain lengths grafted on it. Based on this, a series of high-performance water-reducing agent products with different characteristics have been derived.

[0032] Before the emergence of polycarboxylic acid admixtures, there were lignin sulfonate admixtures, naphthalene sulfonate formaldehyde condensates, melamine formaldehyde condensates, acetone sulfonate formaldehyde condensates, amino sulfonate formaldehyde condensates, etc. At first, Japan took the lead in successfully developing polycarboxylic acid water reducers. The new generation of polycarboxylic acid high-efficiency water reducers overcomes some of the disadvantages of traditional water reducers and has outstanding advantages such as low dosage, good collapse retention performance, low concrete shrinkage, strong adjustability in molecular structure, great potential for high performance, and no formaldehyde is used in the production process.

[0033] However, the wastewater generated during the production of polycarboxylic acid contains high concentrations of organic matter and inorganic salts. Traditional wastewater treatment methods have problems such as low treatment efficiency, high cost, and secondary pollution. In addition, a large amount of wastewater is generated during the production of polycarboxylic acid water reducer, which needs to be treated by a wastewater treatment device before it can be discharged. The existing wastewater treatment device has a large amount of residue adhering to its inner wall surface due to the long-term flow of wastewater inside, which is inconvenient to clean. Over time, it is easy to cause rust inside the wastewater treatment device, further leading to the problem of low treatment efficiency of the existing polycarboxylic acid wastewater treatment device.

[0034] In order to alleviate the above-mentioned problems, the embodiment of the present disclosure provides a wastewater treatment device 001 for polycarboxylic acid production, which can first pass the wastewater through a pretreatment unit 10, then flow into the main treatment unit 20 for biodegradation, and finally pass through the post-treatment unit 30 for final purification. The entire process can chemically react the wastewater to generate solid residues, and can also degrade the organic matter in the wastewater. After further filtering the wastewater residues through multiple filtrations, the filtered wastewater can be discharged according to actual needs. It should be pointed out that the wastewater treatment device 001 for polycarboxylic acid production in the embodiment of the present disclosure can be set after the polycarboxylic acid production setting. The specific contents of the wastewater treatment device 001 for polycarboxylic acid production are explained as follows: refer to Figure 1 The embodiment of the present disclosure provides a wastewater treatment device 001 for polycarboxylic acid production, which includes: a pretreatment unit 10, a main treatment unit 20 and a post-treatment unit 30; it should be noted that, in accordance with the treatment sequence, the pretreatment unit 10 is located at the first position, the main treatment unit 20 is located in the middle position, and the post-treatment unit 30 is located at the last position, and the three treatment units are connected by pipelines so that the wastewater can flow among the three.

[0035] Among them, the pretreatment unit 10 is used to remove large particles of impurities in the wastewater, which can be understood as initial filtration; the main treatment unit 20 adopts a new type of biofilm reactor 21, which uses specific microorganisms to degrade organic matter in the wastewater; the post-treatment unit 30 further purifies the wastewater to ensure that it meets the emission standards, which can be understood as performing secondary and tertiary filtration of the wastewater in the post-treatment unit 30. The wastewater treatment device 001 for polycarboxylic acid production according to the embodiment of the present disclosure has high wastewater treatment efficiency and can significantly reduce the concentration of pollutants in the wastewater in a short time; the overall device has low production cost, simple operation and easy maintenance; the overall device meets environmental protection requirements, does not produce secondary pollution, and is conducive to sustainable development.

[0036] Exemplarily, the filtered liquid with microorganisms in the biofilm reactor 21 is pre-introduced into the container. In addition, by introducing polycarboxylic acid production wastewater or reaction gas into the pretreatment unit 10 at a preset frequency, the reaction gas can react with some substances in the wastewater to produce solid residues. Exemplarily, the reaction gas includes but is not limited to oxygen or other reaction gases.

[0037] Specifically, in the polycarboxylic acid production wastewater treatment device 001 of the embodiment of the present disclosure, the pretreatment unit 10 includes a reactor 11, a stirring device 12 located inside the reactor 11, and a vibrating screen 13 connected to the bottom of the reactor 11, and the vibrating screen 13 can screen out large particle impurities of pulmonary edema. Exemplarily, the stirring device 12 includes a stirring shaft 121 and a stirring blade 122 inserted into the outer periphery of the stirring shaft 121. The stirring blade 122 has a plurality of stirring blades, and the plurality of stirring blades 122 are staggered.

[0038] Exemplarily, the reaction kettle 11 is made of a stainless steel vessel with a surface spray-painted surface, and the spray-painting treatment can avoid corrosion problems.

[0039] Exemplarily, the pretreatment unit 10 further includes a sewage inlet 14 and a vent 15, which are connected to the reactor 11 of the pretreatment unit 10 through a valve port 16 and a coupling 17 in turn. The vent 15 can be used to introduce steam, and the sewage during the stirring process can be cooled. Alternatively, the vent 15 can be used to introduce oxygen or other reaction gases, so that the wastewater reacts chemically with oxygen or other reaction gases under reaction conditions to generate solid residues or other environmentally friendly gases. Exemplarily, the environmentally friendly gas includes but is not limited to carbon dioxide.

[0040] Specifically, the pretreatment unit 10 is located in the previous process of the main treatment unit 20. The main treatment unit 20 includes a biofilm reactor 21, which includes wastewater with specific microorganisms. The microorganisms in the wastewater decompose the macromolecules of the pollutants into small molecules, creating conditions for the subsequent redox reaction. Furthermore, the pretreatment unit 10 and the main treatment unit 20 are connected to the first main line 22, one end of the first main line 22 extends into the bottom of the reactor 11 of the pretreatment unit 10, and the other end of the first main line 22 extends into the bottom of the biofilm reactor 21. In the polycarboxylic acid production wastewater treatment device 001 of the present embodiment, the design details of the biofilm reactor 21 in the main treatment unit 20 include the selection of microbial strains and culture conditions. Among them, the main treatment unit 20 adopts the design of a new biofilm reactor 21, which improves the degradation efficiency of microorganisms. At the same time, a special microbial strain is used to efficiently decompose specific organic substances in polycarboxylic acid wastewater.

[0041] Specifically, in the polycarboxylic acid production wastewater treatment device 001 of the embodiment of the present disclosure, the post-treatment unit 30 adopts an integrated method of membrane separation and adsorption technology to effectively remove residual pollutants in the wastewater. Exemplarily, the post-treatment unit 30 includes a reaction vessel 31, and a biofilm filtration layer 32 is arranged in the reaction vessel 31. Exemplarily, the biofilm filtration layer 32 includes at least three layers arranged in a stacked manner. From top to bottom, the mesh diameter of each layer of the biofilm filtration layer 32 gradually decreases, and the residual pollutants can be screened out step by step. Further, the biofilm filtration layer 32 is located above the wastewater liquid level, and an adsorption device 33 is centrally arranged on the surface and inside of the wastewater. The adsorption device 33 includes an adsorption layer 331 arranged around the outer periphery of the adsorption device 33, a pump body 332 arranged inside, and a plurality of adsorption inlet pipes 333 and a plurality of adsorption outlet pipes 334 arranged radially and connected between the pump body 332 and the adsorption layer 331. One adsorption inlet pipe 333 is connected to one adsorption outlet pipe 334, which is convenient for adsorbing impurities in the wastewater at least twice to perform final filtration. It should be pointed out that, considering the water-proof performance of the adsorption device 33, a closed shell is provided for the adsorption device 33, and the closed shell is covered on the outer periphery of the pump body 332, so that the adsorption layer 331 is located around the closed shell. Exemplarily, the main treatment unit 20 and the post-treatment unit 30 are connected to the second main line 34, one end of the second main line 34 is connected to the bottom surface of the biofilm reactor 21, and the other end of the second main line 34 is connected to the reactor vessel 31 of the post-treatment unit 30, and the pipe mouth is located above the biofilm filtration layer 32.

[0042] Furthermore, both the adsorption inlet pipe 333 and the adsorption outlet pipe 334 are flexible pipes.

[0043] Exemplarily, both the adsorption inlet pipe 333 and the adsorption outlet pipe 334 are spray-painted to prevent corrosion of both and increase their service life.

[0044] In addition to the above scheme, the actual application scenario of the wastewater treatment device 001 for polycarboxylic acid production of the embodiment of the present disclosure is considered. Exemplarily, the pretreatment unit 10 adopts a plurality of stirring blades 122 arranged in an interlaced manner, which can improve the stirring efficiency of the wastewater and the solid residue in the wastewater, and can also increase the contact area between the wastewater and the aforementioned corresponding reaction gas, and further improve the wastewater reaction efficiency. Exemplarily, the sewage inlet 14 and the vent 15 are two different pipe openings, which can be connected to a valve port 16 through a pipeline respectively. The valve port 16 here can be understood as a solenoid valve. The solenoid valve is selected according to actual needs, as long as it is ensured that at least two inlets and two outlets are included. It should be noted here that the two outlets are connected to a pipeline respectively, and the two pipelines are constrained to be the same integral structure by bundling, and then connected to the coupling 17. The coupling 17 is installed on the top surface of the reactor 11, and the top surface of the reactor 11 has a hole connected to the aforementioned two pipelines, which is convenient for sewage and reaction gas to enter the reactor 11.

[0045] Considering the product characteristics of polycarboxylic acid, in actual production, polycarboxylic acid generally includes ether polycarboxylic acid water reducer and ester polycarboxylic acid water reducer. For example, polyether and unsaturated acid are polymerized under the action of initiator to form a finished product (ether polycarboxylic acid water reducer); alcohol ether and unsaturated acid are acidified into macromonomers and then polymerized to form a finished product (ester polycarboxylic acid water reducer). They all introduce branched carboxyl groups into the main chain polyether to form a comb-type polymer.

[0046] Further considering the control of the wastewater flow rate between the pretreatment unit 10 and the main treatment unit 20, a switch valve is also provided between the pretreatment unit 10 and the main treatment unit 20 in the first main line 22. The switch valve has a built-in control circuit board, which can be used to automatically open and close the passage of the first main line 22; alternatively, the switch valve is manually operated.

[0047] Considering the filtering effect of the biofilm filter layer 32, the biofilm filter layer 32 can be composed of at least three layers, which are stacked in the longitudinal direction. Considering the filtering effect, the sides of the biofilm filter layer 32 are completely attached to the inner wall of the reaction vessel 31, and the reaction vessel is completely cut off along the transverse section to prevent wastewater from flowing directly into the reaction vessel 31 without being filtered.

[0048] In order to further control the wastewater flow rate between the main treatment unit 20 and the post-treatment unit 30, a switch valve is further provided between the second main line 34 and the post-treatment unit 30. The switch valve has a built-in control circuit board, which can be used to automatically open and close the passage of the second main line 34; alternatively, the switch valve is manually operated.

[0049] In actual application, the polycarboxylic acid production wastewater treatment device 001 of the embodiment of the present disclosure is installed between the polycarboxylic acid production equipment and the wastewater discharge equipment. The polycarboxylic acid wastewater is introduced into the pretreatment unit 10 through the sewage inlet 14. At the same time, oxygen or other reaction gas or steam is introduced into the pretreatment unit 10 through the vent 15. Under the action of the coupling 17 and the external drive motor, the stirring shaft 121 can rotate in the reactor 11, thereby driving the stirring blade 122 to continuously stir the polycarboxylic acid wastewater. During the process, the polycarboxylic acid wastewater and the reaction gas react chemically under the reaction conditions and generate solid residue. Under the continuous stirring of the stirring shaft 121 and the stirring blade 122, the polycarboxylic acid wastewater fully reacts with the reaction gas. Then, under the action of the vibrating screen 13, the solid residue can be deposited at the bottom of the reactor 11. Then, the reacted polycarboxylic acid wastewater flows to the biofilm reactor 21 of the main treatment unit 20 through the first main pipeline 22. There are special microbial strains in the biofilm reactor 21, which can efficiently decompose specific organic substances in the polycarboxylic acid wastewater. Afterwards, the polycarboxylic acid wastewater after secondary treatment flows to the reaction vessel 31 of the post-treatment unit 30 through the second main pipe 34. It should be noted that the reaction vessel 31 can be made of the same material as the reactor 11. In the reaction vessel 31, the polycarboxylic acid wastewater flowing out through the second main pipe 34 sequentially passes through the three-layer biofilm filtration layer 32 at the bottom of the fluid reaction vessel 31, and an adsorption device 33 is arranged below the biofilm filtration layer 32 to perform the final adsorption filtration on the polycarboxylic acid wastewater, where the adsorption is mainly small particles of residue.

[0050] As required, the reaction vessel 31 may be provided with a purification outlet, and the polycarboxylic acid wastewater that has undergone a series of treatments flows out through the purification outlet and is directly discharged or flows to a wastewater discharge device for subsequent treatment.

[0051] By using the wastewater treatment device 001 for polycarboxylic acid production disclosed in the present invention, through the comprehensive application of the pretreatment unit 10, the main treatment unit 20 and the post-treatment unit 30, large particles of impurities are filtered out after initial filtration, and then the organic matter in the wastewater is degraded by the main treatment unit 20, and then the post-treatment unit 30 performs secondary filtration and tertiary filtration, the polycarboxylic acid wastewater can be efficiently filtered.

[0052] In general, the polycarboxylic acid production wastewater treatment device 001 according to the embodiment of the present disclosure has high efficiency in treating polycarboxylic acid wastewater and can significantly reduce the concentration of pollutants in the wastewater in a short time; the overall device has low production cost, simple operation and easy maintenance; the overall device meets environmental protection requirements, does not produce secondary pollution, and is conducive to sustainable development.

[0053] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

[0054] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0055] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A wastewater treatment device for polycarboxylic acid production, characterized in that: include: A pretreatment unit, the pretreatment unit is used to perform initial filtration on the wastewater, the initial filtration includes removing large particle impurities in the wastewater by stirring; A main treatment unit, the main treatment unit comprising a biofilm reactor with microorganisms for degrading organic matter in the wastewater; A post-treatment unit is connected to the biofilm reactor and is used for performing secondary filtration and tertiary filtration on the wastewater.

2. The polycarboxylic acid production wastewater treatment device according to claim 1, characterized in that: The pretreatment unit comprises a reactor, a stirring device located inside the reactor and a vibrating screen connected to the bottom of the reactor, wherein the vibrating screen is used to screen out large particle impurities of pulmonary edema.

3. The polycarboxylic acid production wastewater treatment device according to claim 2, characterized in that: The stirring device comprises a stirring shaft and a stirring blade inserted on the outer periphery of the stirring shaft; the stirring blades are provided in plurality and are arranged in a staggered manner.

4. The polycarboxylic acid production wastewater treatment device according to claim 3, characterized in that: The pretreatment unit also includes a sewage inlet and a vent, which are connected to the reactor via a valve port and a coupling in sequence.

5. The wastewater treatment device for polycarboxylic acid production according to claim 2, characterized in that: The main treatment unit includes a biofilm reactor, and the biofilm reactor includes wastewater with specific microorganisms.

6. The polycarboxylic acid production wastewater treatment device according to claim 5, characterized in that: The pretreatment unit is connected to the main treatment unit by a first main pipeline, one end of the first main pipeline extends into the bottom of the reactor, and the other end of the first main pipeline extends into the bottom of the biofilm reactor.

7. The polycarboxylic acid production wastewater treatment device according to claim 6, characterized in that: The post-treatment unit comprises a reaction vessel and a biofilm filtration layer. The biofilm filtration layer is located above the wastewater liquid level in the reaction vessel. The wastewater from the main treatment unit flows to the bottom of the reaction vessel through the biofilm filtration layer.

8. The polycarboxylic acid production wastewater treatment device according to claim 7, characterized in that: The main processing unit and the post-processing unit are connected by a second main pipeline, one end of the second main pipeline is connected to the bottom surface of the biofilm reactor, the other end of the second main pipeline is connected to the reaction vessel, and the pipe mouth is located above the biofilm filtration layer.

9. The polycarboxylic acid production wastewater treatment device according to claim 1, characterized in that: The post-processing unit also includes an adsorption device, which includes an adsorption layer arranged around its periphery, a pump body arranged inside itself, and a plurality of adsorption inlet pipes and a plurality of adsorption outlet pipes connected between the pump body and the adsorption layer, one of the adsorption inlet pipes is connected to one of the adsorption outlet pipes.

10. The polycarboxylic acid production wastewater treatment device according to claim 9, characterized in that: The adsorption device comprises a closed shell, which is covered on the outer periphery of the pump body, and the adsorption layer is located around the closed shell.

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