A resin formulation method for removing trace impurities from coal chemical wastewater

Abstract

This invention discloses a resin compounding method for removing trace impurities from coal chemical wastewater, specifically relating to the field of wastewater treatment technology. It solves the problems of existing technologies, such as difficulty in eliminating trace impurities, complex processes, high costs, and large amounts of wastewater generated. The method is characterized by the following steps: screening out a gel-type strong base anion exchange resin A; screening out a macroporous adsorption resin B; testing and measuring various indicators of resins A and B in a coal chemical wastewater environment; determining the compounding ratio of resins A and B based on the measured indicators and compounding them into a composite resin C; using composite resin C for adsorption; and regenerating the resin after adsorption saturation. This invention has the advantages of good impurity removal effect, simple process, low cost, and environmental friendliness.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically relating to a resin compounding method for removing trace impurities from coal chemical wastewater. Background Technology

[0002] In the coal chemical industry, processes such as coking, coal gasification, and coal liquefaction often generate large amounts of industrial wastewater. This wastewater is typically complex in composition, containing not only a large amount of recalcitrant toxic and harmful pollutants, resulting in high TOC concentrations, but also exhibiting high color and salt concentration, classifying it as high-concentration organic biochemical wastewater that is difficult to biodegrade. Due to its inherent water quality characteristics, this type of wastewater cannot be directly discharged into the environment and is usually treated conventionally for in-plant reuse or resource utilization. However, even after conventional treatment, trace amounts of recalcitrant organic matter, active silica, and fluoride ions often remain, failing to meet the requirements for in-plant reuse or resource utilization. Therefore, it is necessary to further remove trace amounts of recalcitrant organic matter, active silica, and fluoride ions from coal chemical wastewater to meet subsequent utilization requirements. Resin processes are a commonly used treatment method for removing trace components. Resin is a high-molecular polymer adsorbent that often adsorbs target substances through chemical bond chelation, ion exchange, and pore adsorption to achieve separation or purification. However, single resins are often targeted at one or a class of substances. To achieve the simultaneous removal of trace amounts of recalcitrant organic matter, active silicon, and fluoride ions from wastewater, composite resins are a better choice. Among them, gel-type strong base anion exchange resins loaded with active metal element groups can effectively form stable complexes with fluoride ions in water to remove fluoride ions, while removing active silicon components in water through ion exchange; while macroporous adsorption resins, due to their good macroporous network structure and large specific surface area, can effectively adsorb organic matter. The advantages of using these two resins in combination are: (1) simultaneous removal of trace amounts of recalcitrant organic matter, active silicon, and fluoride ions; (2) saving process equipment and simplifying process operation; (3) reducing the amount of wastewater produced after resin regeneration and cleaning, and saving the amount of resin regeneration reagent used. Chinese patent document CN105174577A discloses a pretreatment process and apparatus for coal chemical wastewater. The process involves filtering the wastewater and then adsorbing it in a multi-stage resin adsorption tank. The BOD5 / CODcr ratio of the wastewater is increased from less than 0.2 in the raw water to more than 0.53. Ammonia stripping and regeneration solvent separation and recovery are achieved through a multi-functional distillation column, resulting in effluent ammonia nitrogen levels of less than 150 mg / L. After resin adsorption saturation, regeneration is performed using a solvent regeneration method. The regenerated solvent is recovered through a distillation column, separating a regenerated solvent with a purity greater than 95% for recycling, while simultaneously obtaining crude phenol. The multi-stage stirred resin adsorption tank pretreatment of the coal chemical wastewater, with the resin undergoing staged countercurrent desorption using a circulating regeneration solvent, improves the resin regeneration rate and the utilization rate of the regeneration solvent, shortens the process flow, and saves on equipment investment costs.

[0003] However, the aforementioned coal chemical wastewater pretreatment process and device still have the following shortcomings: 1. Difficulty in eliminating trace impurities: Although the process can improve the BOD5 / CODcr value, some trace amounts of recalcitrant organic matter or other trace impurities may still remain and cannot be completely removed. 2. Complex process operation: This process includes multiple complex operating units, requiring a high level of operational skills and management. The complex operation may lead to operator errors, increasing the difficulty of maintenance and management. Summary of the Invention

[0004] The purpose of this invention is to address the problems of existing technologies, such as difficulty in eliminating trace impurities, complex processes, high costs, and excessive wastewater generation. This invention provides a resin compounding method for removing trace impurities from coal chemical wastewater, achieving advantages such as good impurity treatment effect, simple process, low cost, and environmental friendliness. Specifically, this is achieved through the following technical solution:

[0005] A method for removing trace impurities from coal chemical wastewater, characterized by comprising the following steps:

[0006] S1: Screening out gel-type strong base anion exchange resin A;

[0007] S2: Screen out macroporous adsorption resin B;

[0008] S3: Various indicators of resin A and resin B were tested and measured in a coal chemical wastewater environment.

[0009] S4: Based on the measured indicators of resin A and resin B, determine the composite ratio of resin A and resin B and composite them into composite resin C.

[0010] S5: Adsorption is performed using composite resin C. After adsorption saturation, regeneration is carried out.

[0011] The advantage of this method is its high efficiency in removing trace impurities from coal chemical wastewater. By screening gel-type strong-base anion exchange resin A and macroporous adsorption resin B, and then determining their composite ratio based on experimentally measured indicators, a composite resin C is formed. After adsorption using composite resin C, trace impurities can be effectively removed, and regeneration is then performed. This method can improve wastewater treatment efficiency, reduce impurity content, thereby protecting the environment and ensuring compliant wastewater discharge.

[0012] Preferably, the resin A has a fluoride-removing active group, which is an active group containing a metal element M, and its form is RM(OH). n , where R is a carbon, hydrogen, or nitrogen group; the following reaction occurs in a coal chemical wastewater environment:

[0013] RM(OH) n +F -→RM(OH) n-1 F+OH -

[0014] RM(OH) n +SiO3 2- →RM(OH) n-2 SiO3 + 2OH -

[0015] Resin A possesses defluorination active groups, which can remove fluoride ions and activated silica from wastewater. These defluorination active groups chemically react with fluoride ions and activated silica, adsorbing them onto the resin and thus removing trace impurities from the wastewater. This method of using resin A with defluorination active groups can achieve highly efficient removal of specific pollutants to a certain extent.

[0016] Preferably, step S2 is further expressed as:

[0017] S2.1: Organic matter in water is classified into low molecular weight organic matter, medium molecular weight organic matter, and high molecular weight organic matter according to molecular weight;

[0018] S2.2: For low molecular weight organic compounds, the average pore size of resin B is 0-10 nm; for medium molecular weight organic compounds, the average pore size of resin B is 10-30 nm; and for high molecular weight organic compounds, the average pore size of resin B is >30 nm.

[0019] S2.3: Organic matter in water is classified into non-polar organic matter, weakly polar organic matter, moderately polar organic matter, and polar organic matter according to molecular polarity;

[0020] S2.4: For non-polar organic compounds, select the corresponding resin B as a non-polar resin; for weakly polar organic compounds, select the corresponding resin B as a weakly polar resin; for moderately polar organic compounds, select the corresponding resin B as a moderately polar resin; and for polar organic compounds, select the corresponding resin B as a polar resin.

[0021] In step S2, appropriate resin type B and pore size were selected for adsorption based on the molecular weight and polarity of the organic matter. This classification by molecular weight and polarity helps to more effectively select suitable resin B for adsorption, improving the removal efficiency. By classifying organic matter with different molecular weights and polarities, it is possible to better adapt to different wastewater compositions and optimize the adsorption effect, thereby improving the efficiency of wastewater treatment.

[0022] Preferably, the low molecular weight organic compound has a value of 0–500 Da, the medium molecular weight organic compound has a value of 500–1000 Da, and the high molecular weight organic compound has a value of >1000 Da.

[0023] This method categorizes organic matter into low-molecular-weight, medium-molecular-weight, and high-molecular-weight organic compounds based on their molecular weight, facilitating more precise selection of the appropriate resin B for adsorption. By classifying organic matter within different molecular weight ranges, the characteristics of organic matter in these ranges can be controlled and removed, thereby improving wastewater treatment efficiency.

[0024] Preferably, step S3 is further expressed as:

[0025] S3.1: Under the environment of coal chemical wastewater, the actual adsorption capacity Q of resin A for fluoride ions was determined by experiment. A1 And the adsorption concentration difference ΔF; S3.2: Under the environment of coal chemical wastewater, the actual adsorption capacity Q of resin A for activated silicon was obtained by experiment. A2 And the adsorption concentration difference ΔSi; S3.3: Under the environment of coal chemical wastewater, the actual adsorption capacity Q of resin B for the target organic matter was obtained by experiment. B And the adsorption concentration difference ΔTOC.

[0026] In step S3, the adsorption capacity and concentration difference of resin A for fluoride ions and activated silica, and resin B for the target organic matter were experimentally determined. This experimental data helps determine the adsorption performance of resins A and B and provides a basis for determining the resin composite ratio in subsequent steps. Obtaining experimental data allows for a more accurate understanding of the composition and properties of trace impurities in the wastewater, thereby guiding subsequent treatment steps.

[0027] Preferably, step S4 is further expressed as:

[0028] S4.1: Summarize the measured actual adsorption capacity Q of resin A for fluoride ions. A1 and the adsorption concentration difference ΔF, and the actual adsorption capacity Q of resin A for activated silicon. A2 and the adsorption concentration difference ΔSi and the actual adsorption capacity Q of resin B for the target organic compound. B and the adsorption concentration difference ΔTOC;

[0029] S4.2: If Q A1 / ΔF>Q A2 If / ΔSi, then the composite ratio of resin A and resin B is Q. B / ΔTOC:Q A2 / ΔSi is 0.8 to 1.2 times; if Q A1 / ΔF A2 If / ΔSi, then the composite ratio of resin A and resin B is Q. B / ΔTOC:Q A1 / ΔF is 0.8 to 1.2 times;

[0030] ​S4:3: According to the composite ratio, resin A and resin B are combined to form composite resin C;

[0031] The composite ratio mentioned above is a volume ratio.

[0032] In step S4, the composite ratio of resins A and B was determined based on the experimentally measured adsorption capacity and concentration difference. The composite ratio of resins A and B was determined by comparing the ratios of different indicators according to their different adsorption properties. This comparison and judgment based on experimental data allows for a more scientific determination of the composition of composite resin C, resulting in superior adsorption performance and improved wastewater treatment efficiency.

[0033] Preferably, in step S5, the regeneration process includes regenerating the composite resin C with a sodium hydroxide solution and then washing it with distilled water until neutral.

[0034] In step S5, the composite resin C is regenerated using a sodium hydroxide solution and then washed with distilled water until neutral. This regeneration method allows for the recycling of composite resin C, reducing processing costs and protecting the environment. Simultaneously, washing with distilled water cleans the composite resin C, ensuring that the regenerated resin C does not contaminate the processing procedure.

[0035] Preferably, the concentration of the sodium hydroxide solution is 3%-10%.

[0036] The sodium hydroxide solution concentration described in this method is 3%-10%, a range suitable for the regeneration of composite resin C. An appropriately concentrated sodium hydroxide solution can effectively remove trace impurities from the wastewater adsorbed on the composite resin C, thus achieving its regeneration. Furthermore, using distilled water for neutral washing of the composite resin C avoids the influence of acidity or alkalinity during the treatment process and ensures that the final wastewater treatment results meet relevant environmental protection requirements.

[0037] Therefore, the present invention has the following beneficial effects:

[0038] 1. Excellent Impurity Removal: This coal chemical wastewater treatment method utilizes composite resin C, where resins A and B specifically adsorb fluoride ions, activated silicon, and organic matter, respectively. Detailed experimental procedures were used to measure the actual adsorption capacity and concentration differences of different resins, demonstrating that composite resin C can efficiently remove trace impurities, ensuring that the water quality meets standards.

[0039] 2. Simple Process: This invention employs simple process steps, including resin screening, index testing, determination of compounding ratio, adsorption, and regeneration treatment. These steps are relatively intuitive and easy to implement. Through meticulous classification, appropriate resins are used for organic compounds with different molecular weights and polarities, making the treatment process more precise.

[0040] 3. Low cost: This invention selectively uses different resin types instead of a single resin, which reduces costs. Furthermore, by using composite resin C and adjusting the composite ratio according to the actual adsorption capacity, the required resin amount is minimized, further saving costs. The reagents and solutions required throughout the process are relatively simple to use, reducing wastewater production after resin regeneration and cleaning, and also reducing the amount of resin regeneration agents used, thereby lowering costs.

[0041] 4. Environmental Protection: The fluoride-removing active groups of resin A used in this invention have high adsorption efficiency for fluoride ions, and its fluoride removal reaction is environmentally friendly. The regeneration stage uses a low-concentration sodium hydroxide solution (3%-10%), which helps reduce the amount of chemicals used and minimizes the environmental impact of the wastewater treatment process. Attached Figure Description

[0042] Figure 1 This is a flowchart of the method of the present invention;

[0043] Figure 2 This is an experimental result diagram of one embodiment of the present invention;

[0044] Figure 3 The figure shows the experimental results of another embodiment of the present invention. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0046] like Figures 1 to 3 As shown, a resin compounding method for removing trace impurities from coal chemical wastewater is characterized by comprising the following steps:

[0047] 1. Screening for gel-type strong base anion exchange resin A with fluoride removal active groups;

[0048] 2. Based on the average molecular weight and polarity of organic matter in water, select macroporous adsorption resin B with suitable polarity and pore size;

[0049] 3. Under the environment of coal chemical wastewater, the actual adsorption capacity Q of resin A for fluoride ions and activated silicon was determined by separate experiments. A1 and Q A2 and the adsorption concentration differences ΔF and ΔSi;

[0050] 4. Under the environment of coal chemical wastewater, the actual adsorption capacity Q of resin B for the target organic matter was determined by separate experiments. B and the adsorption concentration difference ΔTOC;

[0051] 5. According to Q A1 Q A2 QB ΔF, ΔSi, and ΔTOC are used to determine the composite ratio of resin A and resin B and to synthesize composite resin C.

[0052] 6. After the composite resin C is saturated with adsorption, regenerate the composite resin with a 3% to 10% sodium hydroxide solution, and then wash it with distilled water until it is neutral.

[0053] like Figure 1 As shown, the present invention first requires screening for gel-type strong base anion exchange resin A with fluoride-removing active groups. The fluoride-removing active groups refer to active groups containing the metal element M, and their phenotype is: RM(OH). n (R is a carbon, hydrogen, or nitrogen group), which allows it to undergo the following two reactions:

[0054] RM(OH) n +F - →RM(OH) n-1 F+OH -

[0055] RM(OH) n +SiO3 2- →RM(OH) n-2 SiO3 + 2OH -

[0056] This allows resin A to effectively adsorb ions and active silicon; while the metal element M includes, but is not limited to: cerium, zirconium, iron, neodymium, aluminum, lanthanum, and nickel; regarding the selection of resin A, resin A includes, but is not limited to, various types of resins such as LX-760, HPF3500, HPF4000, HPF5200, ZGFS821, CH-87, CH-32, and A-23.

[0057] Secondly, based on the average molecular weight and polarity of organic matter in the water, suitable macroporous adsorption resin B with appropriate polarity and pore size was selected. First, the organic matter in the water was classified according to molecular weight into low-molecular-weight organic matter (0–500 Da), medium-molecular-weight organic matter (500–1000 Da), and high-molecular-weight organic matter (>1000 Da). The corresponding average pore sizes of the selected macroporous adsorption resin B were 0–10 nm, 10–30 nm, and >30 nm, respectively. Then, the organic matter in the water was classified according to molecular polarity into non-polar organic matter, weakly polar organic matter, and moderately polar organic matter. For polar organic compounds, the polarity of the macroporous adsorption resin B selected is as follows: non-polar resin, weakly polar resin, medium polar resin, and polar resin. Regarding the selection of resin B, resin B includes, but is not limited to, various types of resins such as SD200, SD300, SD333, SD600, ADS600, ADS750, ADS800, HP266, HP515, HP268, HP3600, HP1036, HP355, HP388, DA201, DM301, and S-8.

[0058] Next, under the condition of coal chemical wastewater, the actual adsorption capacity Q of resin A for fluoride ions and activated silicon was determined by separate experiments. A1 and Q A2 The adsorption concentration differences ΔF and ΔSi, and the actual adsorption capacity Q of resin B for the target organic compound obtained from the experiment. B and the adsorption concentration difference ΔTOC; and based on Q A1 Q A2 Q B ΔF, ΔSi, and ΔTOC are used to determine the composite ratio of resin A and resin B: If Q A1 / ΔF>Q A2 If / ΔSi, then the composite ratio (volume ratio) of resin A and resin B is Q. B / ΔTOC:Q A2 / ΔSi is 0.8 to 1.2 times; if Q A1 / ΔF A2 If / ΔSi, then the composite ratio (volume ratio) of resin A and resin B is Q. B / ΔTOC:Q A1 / ΔF is 0.8 to 1.2 times.

[0059] Finally, according to the compounding ratio, composite resin C is compounded. After it is saturated with adsorption, composite resin C is regenerated with 3% to 10% sodium hydroxide solution, and then washed with distilled water until neutral.

[0060] ​In summary, this invention utilizes a composite resin C to treat coal chemical wastewater. It is obtained by combining a gel-type strong-base anion exchange resin A with defluorination active groups and a macroporous adsorption resin B that matches the characteristics of organic matter in the water. In the preparation of composite resin C, suitable resins are first screened from various types of gel-type strong-base anion exchange resins A. These resins possess defluorination active groups containing metallic elements M, such as cerium, zirconium, iron, neodymium, aluminum, lanthanum, and nickel. These active groups allow the resin to effectively adsorb fluoride ions and active silicon by reacting with fluoride ions and active silicon. Similarly, suitable resins are screened from various types of macroporous adsorption resins B, based on the average molecular weight and polarity of the organic matter in the water. These resins have different pore sizes and polarities to meet the adsorption requirements of low-molecular-weight, medium-molecular-weight, and high-molecular-weight organic matter, as well as non-polar, weakly polar, moderately polar, and polar organic matter. Experiments were conducted in a coal chemical wastewater environment to determine the actual adsorption capacity of resin A for fluoride ions and activated silica, and the actual adsorption capacities of resins A and B for the target organic compounds were measured. Based on these experimental data, the composite ratio of resin A and resin B can be determined. If Q A1 / ΔF>Q A2 / ΔSi(where Q) A1 and Q A2 Let ΔF and ΔSi be the actual adsorption capacities of resin A for fluoride ions and activated silicon, respectively, and ΔF and ΔSi be the adsorption concentration differences. Then, the composite ratio (volume ratio) of resin A and resin B is Q. B / ΔTOC:Q A2 / ΔSi is 0.8 to 1.2 times (where QB is the actual adsorption capacity of resin B for the target organic compound, and ΔTOC is the adsorption concentration difference). If Q A1 / ΔF A2 / ΔSi, the composite ratio is Q B / ΔTOC:Q A1 / ΔF is 0.8 to 1.2 times. Finally, according to the determined compounding ratio, resin A and resin B are compounded to obtain composite resin C. Once composite resin C is saturated with adsorbents in the wastewater, it can be regenerated using a 3% to 10% sodium hydroxide solution. After regeneration, composite resin C is rinsed with distilled water until neutral to prepare it for the next round of adsorption.

[0061] ​This composite resin C system offers several advantages. First, the combination of resin A and resin B allows for the effective adsorption of fluoride ions, activated silica, and target organic matter in the wastewater. The fluoride-removing active groups of resin A efficiently remove fluoride ions from the wastewater, while the selective adsorption characteristics of resin B effectively remove target organic matter. Second, by selecting appropriate resin B based on the different molecular weights and polarities of organic pollutants, efficient adsorption capacity for different types of organic pollutants can be ensured. Finally, the composite resin C has a high adsorption capacity, which can extend the recycling time of treated wastewater and improve treatment efficiency.

[0062] In summary, the design and preparation process of this composite resin C system fully considers the characteristics of wastewater and the properties of the adsorbent material, enabling the efficient removal of fluoride ions, active silica, and target organic matter from the wastewater. The application of this system is expected to play a significant role in the treatment of coal chemical wastewater, improving wastewater treatment efficiency, reducing water pollution, and contributing to environmental protection.

[0063] like Figure 2 In one embodiment shown, the present invention first screens out a gel-type strong base anion exchange resin A1. This resin A1 is used to remove anionic pollutants, such as fluoride ions and activated silica, from wastewater. It contains active groups containing the metal element M, such as RM(OH). n In this system, R represents carbon, hydrogen, and nitrogen groups. These groups can react with pollutants in wastewater, such as forming RM(OH) with fluoride ions. n-1 F+OH -The reaction proceeds as follows. Then, the organic matter in the wastewater is classified according to its molecular weight into low-molecular-weight organic matter, medium-molecular-weight organic matter, and high-molecular-weight organic matter. This helps determine which resin B1 to select, and then the resin B1 with the corresponding average pore size is selected based on the molecular weight of the organic matter. For example, low-molecular-weight organic matter is selected using resin B1 with an average pore size of 0–10 nm, medium-molecular-weight organic matter using resin B1 with an average pore size of 10–30 nm, and high-molecular-weight organic matter using resin B1 with an average pore size greater than 30 nm. Next, the organic matter in the wastewater is classified according to its polarity into non-polar, weakly polar, moderately polar, and polar organic matter, and the corresponding polar resin B1 is selected based on the polarity of the organic matter. For example, non-polar organic matter can be selected using a non-polar resin, weakly polar organic matter can be selected using a weakly polar resin, moderately polar organic matter can be selected using a moderately polar resin, and polar organic matter can be selected using a polar resin. Subsequently, experiments were conducted to determine various parameters of resins A1 and B1. Specifically, the actual adsorption capacity of resin A for fluoride ions and activated silica, and the actual adsorption capacity of resin B for the target organic compound, were measured. These experimental results will be used to determine the composite ratio of resins A1 and B1. First, the measured actual adsorption capacities of resin A for fluoride ions and activated silica, and the adsorption concentration differences of resin B1 for the target organic compound, were summarized. Then, the composite ratio of resins A1 and B1 was determined based on a certain proportional relationship. This ratio can be determined according to Q. A1 / ΔF and Q A2 Determined by comparing / ΔSi. If Q A1 / ΔF>Q A2 If / ΔSi, then the composite ratio of resin A1 and resin B1 will be Q. B / ΔTOC:Q A2 / ΔSi is 0.8 to 1.2 times; if Q A1 / ΔF A2 / ΔSi, then the recombination ratio will be Q B / ΔTOC: 0.8 to 1.2 times QA1 / ΔF, these ratios are based on volume ratio. In this embodiment, the composite ratio of resin A1 and resin B1 is determined to be 1:2; composite resin C1 is synthesized according to the composite ratio of 1:2 and used to adsorb pollutants in wastewater. Once composite resin C is saturated, it needs to be regenerated. In this embodiment, composite resin C1 is regenerated using a 4% sodium hydroxide solution, and then washed with distilled water until neutral. The final measured values ​​are as follows: Figure 2 The experimental results shown are from Figure 2 As can be seen, when the total amount of resin used is equal and the ratio of resin A1 to resin B1 in the composite resin is 1:2, the removal rate of trace recalcitrant organic matter in coal chemical wastewater is 89.03%, the removal rate of activated silicon is 92.36%, the removal rate of fluoride ions is 89.62%, the composite resin regeneration agent is reduced by 28.57%, and the production of composite resin regeneration wastewater is reduced by 40%.​

[0064] In this embodiment, with the same total amount of resin and a 1:2 ratio of resin A1 to resin B1 in the composite resin, the treatment effect on coal chemical wastewater is significant: the high organic matter removal rate and fluoride ion removal rate ensure the effective degradation and removal of pollutants in the wastewater, reducing environmental impact; the increased activated silica removal rate reduces the silicon content in the wastewater, contributing to improved water quality safety and sustainability; by saving on reagent usage and reducing the production of reclaimed wastewater, not only are costs reduced, but resource consumption and the burden of wastewater treatment are also decreased. In conclusion, using this composite resin to treat coal chemical wastewater can achieve efficient utilization of materials and energy, while protecting the environment and reducing costs, making an important contribution to sustainable development.

[0065] like Figure 3 In one embodiment shown, the present invention screened and obtained a gel-type strong base anion exchange resin A2 with fluoride removal active groups; based on the molecular weight and polarity of the main organic matter in coal chemical wastewater, macroporous adsorption resin B2 was screened and obtained; in the environment of coal chemical wastewater, the actual adsorption capacity Q of resin A2 for fluoride ions and active silicon was determined by separate experiments. A1 and Q A2 and the adsorption concentration differences ΔF and ΔSi, as well as the actual adsorption capacity Q of resin B2 for the target organic compound. B and the adsorption concentration difference ΔTOC; based on Q A1 Q A2 Q B The composite ratio of resin A2 to resin B2 was determined to be 1:4 based on ΔF, ΔSi, and ΔTOC. Composite resin C2 was then synthesized according to this ratio. After composite resin C2 was saturated with adsorption, it was regenerated with a 4% sodium hydroxide solution and then washed with distilled water until neutral.

[0066] The final measurement was as follows Figure 3 The experimental results shown are from Figure 3 As can be seen, when the total amount of resin used is equal and the ratio of resin A2 to resin B2 in the composite resin is 1:4, the removal rate of trace recalcitrant organic matter in coal chemical wastewater is 92.08%, the removal rate of activated silicon is 95.33%, the removal rate of fluoride ions is 92.34%, the composite resin regeneration agent is reduced by 14.89%, and the wastewater production of composite resin regeneration is reduced by 20.29%.

[0067] Combining the results of the two embodiments, the advantages of this resin combination scheme are not only reflected in the treatment effect, but also in economic and environmental aspects:

[0068] First, the high organic matter removal rate and fluoride ion removal rate indicate that the composite resin can effectively degrade and remove pollutants in wastewater, thereby reducing adverse environmental impacts and meeting environmental protection requirements.

[0069] Secondly, the increased removal rate of activated silica means a reduction in the silica content in wastewater, which helps improve the safety and sustainability of water quality. This is particularly important for the coal chemical industry, as reducing silica content can decrease equipment corrosion and clogging, extend equipment life, and improve operating efficiency.

[0070] Furthermore, compared to existing methods, this composite resin regeneration agent saves on reagent usage and reduces the amount of composite resin regeneration wastewater produced. This not only lowers treatment costs but also reduces resource consumption and the burden of wastewater treatment. Such economic and emission reduction benefits reinforce each other, aligning with the principles of sustainable development.

[0071] In summary, this invention demonstrates excellent comprehensive effects in treating coal chemical wastewater. It not only protects the environment and improves water quality but also conserves resources and reduces costs, making a significant contribution to sustainable development. This solution has broad application prospects and is expected to be widely used in the field of coal chemical wastewater treatment.

[0072] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A resin compounding method for removing trace impurities from coal chemical wastewater, characterized in that, Includes the following steps: S1: Gel-type strong base anion exchange resin A was selected; resin A has fluoride removal active groups, which are active groups containing metal element M, and their form is: RM(OH). n , where R is a carbon, hydrogen, or nitrogen group; the following reaction occurs in a coal chemical wastewater environment: R-M(OH) n +F - →R-M(OH) n-1 F+OH - , R-M(OH) n +SiO3 2- →R-M(OH) n-2 SiO3+2OH - ; S2: Screen out macroporous adsorption resin B; S3: Various indicators of resin A and resin B were tested and measured in a coal chemical wastewater environment. S4: Based on the measured indicators of resin A and resin B, determine the composite ratio of resin A and resin B and composite them into composite resin C; summarize the measured actual adsorption capacity Q of resin A for fluoride ions. A1 and the adsorption concentration difference ΔF, and the actual adsorption capacity Q of resin A for activated silicon. A2 and the adsorption concentration difference ΔSi and the actual adsorption capacity Q of resin B for the target organic compound. B and the adsorption concentration difference ΔTOC, if Q A1 / ΔF>Q A2 / ΔSi, the composite ratio of resin A and resin B is Q B / ΔTOC:Q A2 / ΔSi is 0.8 to 1.2 times; if Q A1 / ΔF A2 If / ΔSi, then the composite ratio of resin A and resin B is Q. B / ΔTOC:Q A1 / ΔF is 0.8 to 1.2 times, where the composite ratio is a volume ratio;​ S5: Adsorption is performed using composite resin C. After adsorption saturation, regeneration is carried out.

2. The resin compounding method for removing trace impurities from coal chemical wastewater according to claim 1, characterized in that, In step S5, the regeneration process includes regenerating the composite resin C with sodium hydroxide solution and then washing it with distilled water until neutral.

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