A method for treating organic wastewater generated in a photoresist resin synthesis process

Abstract

The application discloses a treatment method of organic wastewater generated in a photoresist resin synthesis process, and belongs to the technical field of organic wastewater treatment. The method comprises the following steps: S1, adding carboxymethyl cellulose (anion type), polyacrylamide and ethylenediaminetetraacetic acid into softened water and stirring and dissolving to obtain solution A; S2, adding the solution A into wastewater generated in the production of photoresist resin, and performing stirring, standing and pressure filtration treatment, so that organic matters, suspended matters, acidic substances and the like in the wastewater can be effectively removed, and the wastewater can reach the discharge standard. The application provides a treatment method of organic wastewater generated in the photoresist resin synthesis process and a preparation process of reagents used in the treatment method, effectively reduces the treatment cost of the organic wastewater, and has the advantages of simple treatment method, solid-liquid separation after chemical reagent treatment, wastewater reaching the discharge standard, effectively removing organic matters, suspended matters, acidic substances and the like in the wastewater after treatment, shortening the treatment time, and improving the production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of organic wastewater treatment, in particular to a treatment method of organic wastewater generated in the process of synthesizing photoresist resin. BACKGROUND

[0002] Wastewater discharge is a prominent environmental problem in the synthetic resin industry. Synthetic resin wastewater is characterized by multiple pollutants, high organic content, great environmental hazards, and certain treatment difficulties.

[0003] In addition, there are many links in the generation of wastewater, including: (1) raw material water and polymerization water, which are discharged together with the material from the reaction kettle during the production process; (2) product washing wastewater, which accounts for up to 90% of the total wastewater; (3) equipment cleaning wastewater; (4) wastewater discharged by vacuum pumps and circulating coolers, etc.

[0004] The wastewater generated in the process of resin production mainly includes acid and alkali washing water, precipitate washing water, and resin glue liquid wastewater. The main components of these wastewaters are organic matter, inorganic matter, heavy metal ions, and suspended solids, among which the content of organic matter and CODcr is very high, and the pH value is acidic or neutral. Due to the presence of a large amount of organic matter and suspended solids in these wastewaters, if they are directly discharged or improperly treated, they will cause serious environmental pollution.

[0005] The main challenges in the treatment of organic wastewater generated in the process of synthesizing photoresist resin lie in the complexity of its composition, high pollutant load, removal of refractory substances, limitations of technical options, and control of treatment cost. Therefore, finding an economical and efficient treatment scheme that can stably meet the standards is a major problem in this field. SUMMARY

[0006] The purpose of the present application is to provide a treatment method of organic wastewater generated in the process of synthesizing photoresist resin, to solve the problems of complex composition and high treatment cost of organic wastewater generated in the process of synthesizing photoresist resin.

[0007] To achieve the above-mentioned purpose, the present application provides a treatment method of organic wastewater generated in the process of synthesizing photoresist resin, which specifically comprises the following steps:

[0008] S1, carboxymethyl cellulose, polyacrylamide, ethylenediaminetetraacetic acid, and desalted water are mixed and stirred according to the mass ratio to dissolve and obtain solution A;

[0009] S2, solution A and organic wastewater generated in the process of synthesizing photoresist resin are mixed and stirred, and then left to stand after stirring;

[0010] S3, the obtained suspension after standing in step two is subjected to pressure filtration to realize solid-liquid separation, and the treatment of organic wastewater is completed.

[0011] Preferably, in the method for treating organic wastewater generated in the process of synthesizing a photoresist resin, the mass ratio of carboxymethyl cellulose, polyacrylamide, ethylenediaminetetraacetic acid, and desalted water in step S1 is 2:(3-5):(0.2-0.5):(10-15).

[0012] Preferably, in the method for treating organic wastewater generated in the process of synthesizing a photoresist resin, the volume ratio of solution A to wastewater in step S2 is 1:(300-500).

[0013] Preferably, in the method for treating organic wastewater generated in the process of synthesizing a photoresist resin, the stirring in step S2 is stopped after 20-30 minutes and the solution is left to stand for 30-40 minutes.

[0014] Preferably, in the method for treating organic wastewater generated in the process of synthesizing a photoresist resin, the obtained suspension is filtered by a filter press to achieve solid-liquid separation.

[0015] Preferably, in the method for treating organic wastewater generated in the process of synthesizing a photoresist resin, the pH value of the generated organic wastewater is 2.5-6.0, the COD concentration is 500-3000 mg / L, the suspended substance concentration is 100-500 mg / L, and the organic matter content is 200-1000 mg / L.

[0016] Preferably, in the method for treating organic wastewater generated in the process of synthesizing a photoresist resin, the carboxymethyl cellulose is an anionic carboxymethyl cellulose.

[0017] Therefore, the method for treating organic wastewater generated in the process of synthesizing a photoresist resin can effectively remove heavy metal ions in the wastewater by using chemical treatment technology, and can also treat organic matters such as COD, thereby effectively reducing the treatment cost of the organic wastewater, and solving the problems of complex composition of the organic wastewater generated in the process of synthesizing a photoresist resin and high treatment cost. After the treatment of the chemical reagent, the wastewater is subjected to solid-liquid separation, so that the wastewater meets the discharge standard. After the treatment, the organic matters, suspended substances, and acidic substances in the wastewater can be effectively removed, the treatment time is shortened, and the production efficiency is improved.

[0018] The technical solutions of the present application will be further described in detail through examples. DETAILED DESCRIPTION

[0019] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Multiple" generally includes at least two.

[0021] It should also be noted that the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the goods or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or include elements inherent to such goods or devices. Without more limitation, the element defined by the sentence "including a…" does not exclude the presence of another identical element in the goods or devices including the element.

[0022] Embodiment 1

[0023] The pH value of the wastewater to be treated is known: 2.1; COD concentration: 2171.9 mg / L; suspended solids concentration: 260.7 mg / L; organic matter content: 660.5 mg / L.

[0024] S1, anionic carboxymethyl cellulose, polyacrylamide, ethylenediaminetetraacetic acid, desalted water are mixed and stirred according to the mass ratio of 2:3:0.2:10 to dissolve, to obtain solution A;

[0025] S2, solution A: wastewater is mixed and stirred at a volume ratio of 1:300, and after stirring, it is left to stand, so that the mixed solution is reacted and precipitated;

[0026] S3, the suspension obtained after standing in step two is filtered by a filter press. Under the action of pressure, solid particles gradually accumulate on the filter cloth or filter plate to form a solid filter cake, while the liquid passes through the filter cloth or filter plate into the liquid collection system to realize solid-liquid separation. After solid-liquid separation, the wastewater treated to reach the discharge standard is obtained.

[0027] A blank control group is set up, and the pH value of the wastewater in the control group is measured: 2.3; COD concentration: 1190.4 mg / L; suspended solids concentration: 80.6 mg / L; organic matter content: 500 mg / L.

[0028] The measured values ​​of the treated wastewater were: pH 6.5; COD concentration: 100.5 mg / L; suspended solids concentration: 20.1 mg / L; organic matter content: 200 mg / L.

[0029] Example 2

[0030] The wastewater to be treated has the following characteristics: pH value: 2.33; COD concentration: 2783.2 mg / L; suspended solids concentration: 330.5 mg / L; organic matter content: 709.5 mg / L.

[0031] S1. Mix and dissolve anionic carboxymethyl cellulose, polyacrylamide, ethylenediaminetetraacetic acid, and deionized water in a mass ratio of 2:4:0.35:13 to obtain solution A;

[0032] S2. Mix solution A and wastewater at a volume ratio of 1:400, stir, and then let stand to allow the mixture to react and precipitate.

[0033] S3. The suspension obtained in step two after settling is filtered through a filter press. Under pressure, solid particles gradually accumulate on the filter cloth or filter plate to form a solid filter cake, while the liquid passes through the filter cloth or filter plate into the liquid collection system to achieve solid-liquid separation. After solid-liquid separation, the treated wastewater meets the discharge standards.

[0034] A blank control group was set up, and the pH value, COD concentration, suspended solids concentration, and organic matter content of the wastewater in the control group were measured to be 2.3, 1197.2 mg / L, 87.6 mg / L, and 550.7 mg / L, respectively.

[0035] The measured values ​​of the treated wastewater were: pH 6.7; COD concentration: 105.6 mg / L; suspended solids concentration: 22.7 mg / L; organic matter content: 177.6 mg / L.

[0036] Example 3

[0037] The wastewater to be treated has the following characteristics: pH value: 2.62; COD concentration: 2378.2 mg / L; suspended solids concentration: 330.7 mg / L; organic matter content: 722.3 mg / L.

[0038] S1. Mix and dissolve anionic carboxymethyl cellulose, polyacrylamide, ethylenediaminetetraacetic acid, and deionized water in a mass ratio of 2:5:0.5:15 to obtain solution A;

[0039] S2. Mix solution A and wastewater at a volume ratio of 1:500, stir, and then let stand to allow the mixture to react and precipitate.

[0040] S3. The suspension obtained in step two after settling is filtered through a filter press. Under pressure, solid particles gradually accumulate on the filter cloth or filter plate to form a solid filter cake, while the liquid passes through the filter cloth or filter plate into the liquid collection system to achieve solid-liquid separation. After solid-liquid separation, the treated wastewater meets the discharge standards.

[0041] A blank control group was set up, and the pH value, COD concentration, suspended solids concentration, and organic matter content of the wastewater in the control group were measured to be 2.62, 1200.1 mg / L, 80.2 mg / L, and 500 mg / L, respectively.

[0042] The measured values ​​of the treated wastewater were: pH 6.5; COD concentration: 107.4 mg / L; suspended solids concentration: 23.1 mg / L; organic matter content: 170.5 mg / L.

[0043] Table 1 shows the pH value, COD concentration, suspended solids concentration, and organic matter content of wastewater before and after treatment in Examples 1-3, as well as the blank control group.

[0044] Table 1 Comparison of values ​​before and after wastewater treatment

[0045]

[0046]

[0047] Therefore, this invention employs a method for treating organic wastewater generated during the synthesis of photoresist resin. By preparing chemical reagents to treat the organic wastewater, this chemical treatment technology effectively removes heavy metal ions from the wastewater and also treats organic substances such as COD, effectively reducing the treatment cost of organic wastewater. The treatment method is simple and solves the problems of complex composition and high treatment cost of organic wastewater generated during the synthesis of photoresist resin. After treatment with chemical reagents, solid-liquid separation is performed to ensure the wastewater meets discharge standards. After treatment, organic matter, suspended solids, acidic substances, etc., in the wastewater can be effectively removed, and the treatment time is shortened, improving production efficiency.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for treating organic wastewater generated in a photoresist resin synthesis process, characterized by: Specifically comprising the following steps: ​ S1, carboxymethyl cellulose, polyacrylamide, ethylenediaminetetraacetic acid, desalted water are mixed and stirred according to the mass ratio of 2: (3-5): (0.2-0.5): (10-15), and dissolved to obtain solution A; the carboxymethyl cellulose is anionic carboxymethyl cellulose; S2, solution A and organic wastewater generated in the production process of photoresist resin are mixed and stirred, and after stirring, they are left to stand; the volume ratio of solution A to wastewater is 1: (300-500); S3, the obtained suspension after standing in step two is pressure filtered to realize solid-liquid separation, and the organic wastewater treatment is completed; The pH value of the generated organic wastewater is 2.5-6.0; the COD concentration is 500-3000 mg / L; the suspended solids concentration is 100-500 mg / L; and the organic matter content is 200-1000 mg / L.

2. The method according to claim 1, wherein the wastewater is generated in a process for synthesizing a photoresist resin. In the step S2, the mixing and stirring is stopped after 20-30 min, and the standing is 30-40 min.

3. The method according to claim 1, wherein the wastewater is generated in a process of synthesizing a photoresist resin. In the step S3, the obtained suspension is pressure filtered by a filter press to achieve the purpose of solid-liquid separation.

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