Method for treating organic waste salt by using deep eutectic solvent and application thereof

Abstract

The application belongs to the technical field of wastewater treatment, and particularly relates to a method for treating organic waste salt by means of a eutectic solvent and application thereof. A hydrogen bond donor and a hydrogen bond acceptor are prepared by means of ultrasonic-assisted heating to obtain a eutectic solvent. The eutectic solvent is mixed with organic waste salt by means of ultrasonic assistance to obtain a mixed solution. The mixed solution is subjected to solid-liquid separation to obtain wet salt and a solvent. The wet salt is washed thoroughly, and a washing solution and salt are collected. The method provided by the application has the characteristics of greenness, safety, simplicity, high organic matter removal rate and sustainable circulation in the whole process, and provides an innovative solution for the pretreatment and resource utilization of industrial organic waste salt.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically relating to a method for treating organic waste salts by eutectic solvent extraction and its application. Background Technology

[0002] Currently, high-polluting industries such as pharmaceuticals, petrochemicals, printing and dyeing, and coal chemicals generate industrial organic waste salts from high-concentration saline organic wastewater that are concentrated through evaporation. These waste salts are rich in carcinogenic organic pollutants such as polycyclic aromatic hydrocarbons (PAHs) and halogenated hydrocarbons, posing a systemic threat to the ecological environment. Persistent organic pollutants (POPs) in these waste salts can accumulate through soil leaching and groundwater migration, resulting in bioaccumulation effects. Their ecotoxicity and carcinogenic risk indices significantly exceed safety thresholds.

[0003] Currently, the main methods for treating organic waste salts include high-temperature pyrolysis, salt washing, extraction, and chemical oxidation. Among these, salt washing uses saturated brine as the washing agent, which is simple to operate, but multi-stage washing increases water consumption and generates polluted wastewater, making it unsuitable for waste salts with complex compositions. Extraction methods use ethanol or methanol as the extractant, which has low energy consumption, but the extractant is volatile and flammable, easily causing secondary pollution and increasing safety risks, and its removal effect on low-concentration or multi-component mixed organic matter is poor. There is an urgent need to develop a new, green, safe, recyclable, and efficient technology for treating waste salts with low concentrations or high content of multi-component organic matter.

[0004] Eutectic solvents (DES) are currently widely used in research fields such as biological and food extraction, environmental remediation, electrochemistry, materials science, and chemical synthesis and catalysis. In biological and food extraction, they are highly effective at extracting target products. In environmental remediation, they are primarily used for oxidative desulfurization and waste gas absorption, but their application in waste salt treatment remains technologically lacking. Currently, waste salt treatment technologies disclosed in Chinese patent applications mostly employ high-temperature pyrolysis, catalytic oxidation, and single-solvent washing methods; no patented methods involving the pretreatment of organic waste salts using eutectic solvents have been disclosed. Summary of the Invention

[0005] This invention primarily provides a highly efficient and stable eutectic solvent, and a method for the sustainable extraction and treatment of organic waste salts using this eutectic solvent, along with its application. This overcomes the problems of existing technologies, such as poor removal efficiency for low-concentration or multi-component mixed organic matter, easy secondary pollution, and high safety risks. The technical solution is as follows:

[0006] A method for treating organic waste salt by extraction with a eutectic solvent involves preparing a eutectic solvent by ultrasonic-assisted heating of a hydrogen bond donor and a hydrogen bond acceptor; mixing the eutectic solvent with the organic waste salt by ultrasonic-assisted mixing to obtain a mixture; performing solid-liquid separation on the mixture to obtain wet salt and solvent; and thoroughly washing the wet salt to collect the washing liquid and salt.

[0007] Furthermore, the hydrogen bond acceptor is a quaternary ammonium salt; the hydrogen bond donor is an organic nitrogen compound or a polyol.

[0008] Furthermore, the hydrogen bond acceptor includes one or more of choline chloride, tetrabutylammonium chloride, or quaternized polyamine.

[0009] Furthermore, the organic nitrogen compound includes one or more of urea, monoethanolamine, or diethanolamine; the polyol includes one or more of glycerol, ethylene glycol, or propylene glycol.

[0010] Furthermore, the molar ratio of hydrogen bond acceptor to hydrogen bond donor is 1:1 to 5; the mass ratio of the organic waste salt to the eutectic solvent is 1:1 to 5.

[0011] Furthermore, the ultrasonic power of the ultrasound is 100-200W; the ultrasonic frequency is 20-30kHz; the ultrasonic time is 10-20min; the preparation temperature is 50-80℃; the preparation time is 20-40min; the mixing temperature is 25-60℃; and the mixing time is 20-35min.

[0012] Furthermore, the wet salt is fully dispersed in ethanol at a mass ratio of 1:1 to 1.5, and the salt and washing liquid are separated and collected.

[0013] Furthermore, the solvent and washing solution are purified to recover the eutectic solvent.

[0014] Furthermore, the purification involves filtering the solvent and washing solution, followed by dehydration; and then distilling under reduced pressure at 75–85°C to recover the eutectic solvent.

[0015] The above-mentioned method for treating organic waste salt by eutectic solvent extraction is applied in wastewater treatment, wherein the organic waste salt contains one or more organic substances.

[0016] By adopting the above scheme, the method of the present invention has the following advantages:

[0017] 1. Quaternary ammonium cation (R4N) + Carrying a permanent positive charge, it attracts anionic pollutants such as sulfate, nitrate, and organic sulfonate from waste salts directly through electrostatic attraction, bringing the anions close to the DES phase interface to achieve electrostatic enrichment. Quaternary ammonium groups can effectively remove anionic dyes through charge neutralization. The ion pairs formed in the quaternary ammonium compound can efficiently adsorb halogen ions through solvent polarity.

[0018] 2. Quaternary ammonium cations form a three-dimensional hydrogen bond network with organic nitrogen compounds or polyols, which disrupts the binding of pollutants to the salt matrix and enhances the solubility of oxygen-containing anions such as phosphate and carboxylate. The hydrophilic hydrogen bond donors form strong hydrogen bonds with oxygen-containing anions through oxygen atoms. The hydrogen bonding effect and the electrostatic effect of the quaternary ammonium cations work together to efficiently remove oxygen-containing anions.

[0019] 3. The eutectic solvent of this invention exhibits highly efficient dissolution and removal capabilities for both low-concentration and high-concentration multi-component mixed organic compounds. Its quaternary ammonium cations can combine with anions in organic waste salts through electrostatic interactions, breaking the ionic bonds between the waste salts and organic matter, and releasing the organic matter. Meanwhile, the anions, as strong hydrogen bond acceptors, enhance the polarity of the solvent, thereby improving the dissolution capacity for organic matter. Organic nitrogen compounds such as monoethanolamine and diethanolamine contain amino and hydroxyl groups, which can synergistically complex anions and enhance removal.

[0020] 4. For example, medium- and long-chain quaternary ammonium salts such as tetraethylammonium chloride can simultaneously adsorb anionic pollutants through electrostatic interactions and adsorb halogenated hydrocarbons through hydrophobic chains, reducing coexistence interference; the polar structure of quaternary ammonium salt compounds gives low co-solubility solvents a high dielectric constant, making them suitable for dissolving polar or moderately polar organic compounds.

[0021] 5. The eutectic solvent of the present invention is inexpensive and widely available. Eutectic solvents with it as hydrogen bond acceptor components are easy to prepare and have low cost, low volatility, low loss, low toxicity, and most components are biodegradable and can be recycled after recovery.

[0022] 6. Ultrasonic waves are introduced during the preparation of eutectic solvents and the treatment of waste salts. The cavitation effect is used to improve the efficiency and stability of the eutectic solvent preparation, so that the eutectic solvent is fully and uniformly mixed with the organic waste salt, accelerating the desorption of organic matter from the salt lattice, penetrating the waste salt lattice, destroying the lattice structure, releasing organic matter and impurities, while retaining the main components of the salt.

[0023] 7. The eutectic solvent of this invention has low toxicity, low volatility, low flammability, and is biodegradable, avoiding secondary pollution and safety risks associated with traditional solvents. The method of this invention systematically treats organic pollutants and inorganic impurities in organic waste salts, achieving the goals of harmlessness and resource utilization of the salts, thus possessing significant environmental and resource value. Attached Figure Description

[0024] Figure 1 This is a comparison diagram of the treatment of three types of organic waste salt before and after Example 1;

[0025] Figure 2 The TOC removal rate of the eutectic solvent for the three waste salts in each embodiment is shown.

[0026] Figure 3 The TOC removal rate of the eutectic solvent for the three waste salts in each control experiment is shown.

[0027] Figure 4 Flowchart for the preparation of eutectic solvents;

[0028] Figure 5 Flowchart for treating organic waste salts using eutectic solvents. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The properties of the organic waste salts in the following examples and control experiments are shown in Table 1:

[0031] Table 1:

[0032]

[0033] Example 1: (1) Choline chloride and urea were mixed in a reactor at a molar ratio of 1:4. The mixture was sonicated for 20 min at a power of 150 W and a frequency of 20 kHz. Then, it was stirred for 20 min at a constant temperature of 60 °C in a water bath at a speed of 300 r / min to obtain a eutectic solvent.

[0034] (2) Mix organic waste salt 1 with eutectic solvent in a reactor at a mass ratio of 1:4. Sonicate for 20 min at a power of 200 W and a frequency of 25 kHz. Then, stir at 300 r / min for 20 min in a constant temperature water bath at 40 °C to obtain a mixture. Centrifuge the mixture at 4000 r / min for 5 min to separate the solvent and wet salt.

[0035] (3) Add 1.25 times the mass of waste salt to the wet salt and stir at 300 r / min for 10 min; after centrifugation at 4000 r / min for 5 min, the washing liquid and salt are separated.

[0036] (4) Wash the obtained salt twice as in step (3), and dry the final salt in a forced-air drying oven at 80°C for 1 hour to obtain salt with most organic matter and impurities removed.

[0037] (5) After filtering the solvent and the washing liquid from multiple washes through a 0.22 μm filter membrane and dehydrating with urea, the solvent and the washing liquid were subjected to vacuum distillation at 75–85 °C and 0.02 MPa water bath conditions to recover the eutectic solvent.

[0038] Organic waste salt 2 and organic waste salt 3 were treated according to the method described in Example 1 of the treatment of organic waste salt 1. A comparison of the treated organic waste salts 1-3 with the original salt is shown below. Figure 1 As shown in the figure, the treated organic waste salt is lighter in color than the original salt, indicating that the method of the present invention can visually remove most of the colored impurities, and the effect is significant.

[0039] Example 2: The difference from Example 1 is as follows:

[0040] (1) Choline chloride and glycerol were mixed in a reactor at a molar ratio of 1:2. The mixture was sonicated for 10 min at a power of 180 W and a frequency of 25 kHz. Then, it was stirred in a constant temperature water bath at 50 °C at a speed of 400 r / min for 20 min to obtain a eutectic solvent.

[0041] (2) Mix organic waste salt 1 with eutectic solvent in a reactor at a mass ratio of 1:3. Sonicate for 10 min at a power of 180 W and a frequency of 25 kHz. Then, stir at 400 r / min for 20 min in a constant temperature water bath at 50 °C to obtain a mixture. Centrifuge the mixture at 3500 r / min for 10 min to separate the solvent and wet salt.

[0042] (3) Add 1.5 times the mass of waste salt to the wet salt and stir at 400 r / min for 5 min; after centrifugation at 3500 r / min for 10 min, the washing liquid and salt are separated.

[0043] Organic waste salt 2 and organic waste salt 3 are treated according to the method of Example 2 for treating organic waste salt 1.

[0044] Example 3: The difference from Example 1 is as follows:

[0045] (1) Choline chloride and ethylene glycol were mixed in a reactor at a molar ratio of 1:5. The mixture was sonicated for 20 min at a power of 180 W and a frequency of 30 kHz. Then, it was stirred in an 80 °C constant temperature water bath at a speed of 200 r / min for 40 min to obtain a eutectic solvent.

[0046] (2) Mix organic waste salt 1 with eutectic solvent in a reactor at a mass ratio of 1:2. Sonicate for 20 min at a power of 180 W and a frequency of 30 kHz. Then, stir at 200 r / min for 40 min in a constant temperature water bath at 80 °C to obtain a mixture. Centrifuge the mixture at 4500 r / min for 7 min to separate the solvent and wet salt.

[0047] (3) Add 1.2 times the mass of waste salt to the wet salt and stir at 200 r / min for 10 min; after centrifugation at 4500 r / min for 7 min, the washing liquid and salt are separated.

[0048] Organic waste salt 2 and organic waste salt 3 are treated according to the method of Example 3 for treating organic waste salt 1.

[0049] Example 4: The difference from Example 1 is as follows:

[0050] (1) Choline chloride and diethanolamine were mixed in a reactor at a molar ratio of 1:1.5. The mixture was sonicated for 15 min at a power of 200 W and a frequency of 25 kHz, and then stirred at a constant temperature of 80 °C for 30 min at a speed of 400 r / min to obtain a eutectic solvent.

[0051] (2) Mix organic waste salt 1 with eutectic solvent in a reactor at a mass ratio of 1:4. Sonicate for 15 min at a power of 200 W and a frequency of 25 kHz. Then, stir at 400 r / min for 35 min in a constant temperature water bath at 80 °C to obtain a mixture. Centrifuge the mixture at 5000 r / min for 6 min to separate the solvent and wet salt.

[0052] (3) Add 1.4 times the mass of waste salt to the wet salt and stir at 400 r / min for 8 min; after centrifugation at 5000 r / min for 6 min, the washing liquid and salt are separated.

[0053] Organic waste salt 2 and organic waste salt 3 are treated according to the method of Example 4 for treating organic waste salt 1.

[0054] Example 5: The difference from Example 1 is as follows:

[0055] (1) Tetrabutylammonium chloride and ethylene glycol were mixed in a reactor at a molar ratio of 1:3. The mixture was sonicated for 10 min at a power of 125 W and a frequency of 20 kHz. Then, it was stirred in a constant temperature water bath at 65 °C at a speed of 350 r / min for 25 min to obtain a eutectic solvent.

[0056] (2) Mix organic waste salt 1 with eutectic solvent in a reactor at a mass ratio of 1:1. Sonicate for 10 min at a power of 200 W and a frequency of 20 kHz. Then, stir at 350 r / min for 25 min in a constant temperature water bath at 65 °C to obtain a mixture. Centrifuge the mixture at 4000 r / min for 5 min to separate the solvent and wet salt.

[0057] (3) Add 1.35 times the mass of waste salt to the wet salt and stir at 350 r / min for 5 min; after centrifugation at 4000 r / min for 5 min, the washing liquid and salt are separated.

[0058] Organic waste salt 2 and organic waste salt 3 are treated according to the method of Example 5 for treating organic waste salt 1.

[0059] Example 6: The difference from Example 1 is as follows:

[0060] (1) Quaternized polyamine and monoethanolamine were mixed in a reactor at a molar ratio of 1:1, and sonicated for 20 min at a power of 100 W and a frequency of 20 kHz. Then, the mixture was stirred at a constant temperature of 300 r / min for 30 min in a 60 °C water bath to obtain a eutectic solvent.

[0061] (2) Mix organic waste salt 1 with eutectic solvent in a reactor at a mass ratio of 1:2. Sonicate for 20 min at a power of 100W and a frequency of 20kHz. Then, stir at 300r / min for 20 min in a constant temperature water bath at 40℃ to obtain a mixture. Centrifuge the mixture at 4000r / min for 5 min to separate the solvent and wet salt.

[0062] (3) Add 1.25 times the mass of waste salt to the wet salt and stir at 300 r / min for 10 min; after centrifugation at 4000 r / min for 5 min, the washing liquid and salt are separated.

[0063] Organic waste salt 2 and organic waste salt 3 are treated according to the method of Example 5 for treating organic waste salt 1.

[0064] Control Experiment 1: The difference from Example 1 is as follows:

[0065] (1) Mix choline chloride and urea in a reactor at a molar ratio of 1:4, then heat in a 60°C constant temperature water bath and stir at 300 r / min for 20 min to obtain a eutectic solvent.

[0066] (2) Mix organic waste salt 1 with eutectic solvent in a reactor at a mass ratio of 1:4, then stir at 300 r / min for 20 min in a constant temperature water bath at 40℃ to obtain a mixture; after centrifuging the mixture at 4000 r / min for 5 min, separate the solvent and wet salt.

[0067] Organic waste salt 2 and organic waste salt 3 were treated using the same method as in control experiment 1 for treating organic waste salt 1.

[0068] Control Experiment 2: The difference from Example 1 is as follows:

[0069] (1) Choline chloride and glycerol were mixed in a reactor at a molar ratio of 1:2. The mixture was sonicated for 30 min at a power of 80 W and a frequency of 20 kHz. Then, it was stirred in a constant temperature water bath at 40 °C at a speed of 400 r / min for 20 min to obtain a eutectic solvent.

[0070] (2) Mix organic waste salt 1 with eutectic solvent in a reactor at a mass ratio of 1:3. Sonicate for 30 min at a power of 80 W and a frequency of 20 kHz. Then, in a constant temperature water bath at 40 °C, stir at a speed of 400 r / min for 20 min to obtain a mixture. After centrifuging the mixture at 3500 r / min for 10 min, separate the solvent and wet salt.

[0071] Organic waste salt 2 and organic waste salt 3 were treated using the same method as in control experiment 2 for treating organic waste salt 1.

[0072] Control Experiment 3: The difference from Example 1 is as follows:

[0073] (1) Choline chloride and ethylene glycol were mixed in a reactor at a molar ratio of 1:5, and then the mixture was stirred at 200 r / min for 40 min in a constant temperature water bath at 80°C to obtain a eutectic solvent.

[0074] (2) Mix organic waste salt 1 with eutectic solvent in a reactor at a mass ratio of 1:2, then heat in an 80°C constant temperature water bath and stir at 200 r / min for 40 min to obtain a mixture; centrifuge the mixture at 4500 r / min for 7 min to separate the solvent and wet salt.

[0075] Organic waste salt 2 and organic waste salt 3 were treated using the same method as in control experiment 3 for treating organic waste salt 1.

[0076] Control Experiment 4: The difference from Example 1 is as follows:

[0077] (1) Choline chloride and diethanolamine were mixed in a reactor at a molar ratio of 1:1.5, and then the mixture was stirred at 400 r / min for 30 min in a constant temperature water bath at 80°C to obtain a eutectic solvent.

[0078] (2) Mix organic waste salt 1 with eutectic solvent in a reactor at a mass ratio of 1:4, then heat in an 80°C constant temperature water bath and stir at 400 r / min for 35 min to obtain a mixture; centrifuge the mixture at 5000 r / min for 6 min to separate the solvent and wet salt.

[0079] Organic waste salt 2 and organic waste salt 3 were treated using the same method as in control experiment 4 for treating organic waste salt 1.

[0080] Control Experiment 5: The difference from Example 1 is as follows:

[0081] (1) Tetrabutylammonium chloride and ethylene glycol were mixed in a reactor at a molar ratio of 1:3. The mixture was sonicated for 10 min at a power of 300 W and a frequency of 20 kHz, and then stirred at a constant temperature of 65 °C for 25 min at a speed of 350 r / min to obtain a eutectic solvent.

[0082] (2) Mix organic waste salt 1 with eutectic solvent in a reactor at a mass ratio of 1:1, then stir at 350 r / min for 25 min in a constant temperature water bath at 65℃ to obtain a mixture; after centrifuging the mixture at 4000 r / min for 5 min, separate the solvent and wet salt.

[0083] Organic waste salt 2 and organic waste salt 3 were treated using the same method as in control experiment 5 for treating organic waste salt 1.

[0084] Control Experiment 6: The difference from Example 1 is as follows:

[0085] (1) Quaternized polyamine and monoethanolamine were mixed in a reactor at a molar ratio of 1:1, and then stirred at 300 r / min for 30 min in a constant temperature water bath at 60°C to obtain a eutectic solvent.

[0086] (2) Mix organic waste salt 1 with eutectic solvent in a reactor at a mass ratio of 1:2, then heat in a 40°C constant temperature water bath and stir at 300 r / min for 20 min to obtain a mixture; centrifuge the mixture at 4000 r / min for 5 min to separate the solvent and wet salt.

[0087] Organic waste salt 2 and organic waste salt 3 were treated using the same method as in control experiment 6 for treating organic waste salt 1.

[0088] Example Sample Testing:

[0089] The results of the TOC removal rates of organic waste salts 1, 2, and 3 in the various examples and control experiments are as follows: Figure 2 and Figure 3 As shown. Comparison Figure 1 and Figure 2It can be seen that the TOC removal rate of organic waste salt treated using the eutectic solvent and method of the present invention is above 80%, while the removal rate of the control experiment is only above 70%, and about 10% lower than that of each example. This indicates that the conditions in the method of the present invention can directly affect the removal effect; whether or not ultrasound is used, and the frequency and power of ultrasound, have a significant impact on the TOC removal rate. Furthermore, the figure also shows that the treatment effect of the method of the present invention on the three types of waste salt is relatively average. However, the TOC removal rate of the eutectic solvent in Example 1, prepared from choline chloride and urea, is significantly better than that of the eutectic solvent prepared from quaternized polyamine and monoethanolamine in Example 6. This indicates that the composition of the eutectic solvent of the present invention has a significant impact on the treatment effect of organic waste salt.

[0090] The XRF characterization results of organic waste salts 1-3 before and after treatment in Example 1 are shown in Tables 2-4:

[0091] Table 2: Organic Waste Salt 1:

[0092] O 19.7668％ 14.1792％ Cl 39.8518％ 45.1822％ Na 30.8884％ 36.8571％ Si 0.3573％ 0.2314％ K 1.3951％ 0.9121％ C 1.8762％ 1.6378％ Ca 0.2532％ 0.1861％ Mg 0.4164％ 0.3956％ S 5.1948％ 0.4185％

[0093] Table 3: Organic Waste Salt 2:

[0094] O 25.2236％ 15.4359％ Cl 33.4377％ 44.8739％ Na 29.3267％ 36.3798％ N 0.7375％ 0.4256％ Fe 1.3638％ 1.0135％ C 5.3652％ 1.2547％ Ca 0.1638％ 0.0942％ Al 0.1869％ 0.1533％ S 4.1948％ 0.3691％

[0095] Table 4: Organic Waste Salt 3:

[0096] O 32.2488％ 11.9399％ Cl 28.2271％ 46.7438％ Na 25.2695％ 35.1257％ Br 4.3473％ 0.4263％ K 1.2436％ 0.9124％ C 1.5198％ 2.6378％ N 0.8351％ 0.9861％ Si 0.1542％ 0.3841％ P 6.1546％ 0.8439％

[0097] As can be seen from Tables 2-4 above, the levels of S and P in the organic waste salt decreased significantly after treatment, indicating that the method of this invention has a significant removal effect on these acid radicals. Simultaneously, the contents of O, Br, K, C, and Ca in the treated organic waste salt also decreased significantly, with NaCl remaining as the main substance. This demonstrates that the method of this invention can not only remove S and P-based acid radicals but also has a significant removal effect on other halogens and metal elements, resulting in a purer NaCl salt. This not only achieves the removal of organic matter but also lays a good foundation for the resource utilization of salt.

[0098] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this invention.

Claims

1. A method for treating organic waste salts by eutectic solvent extraction, characterized in that, A eutectic solvent was prepared by ultrasonic-assisted heating of a hydrogen bond donor and a hydrogen bond acceptor; the eutectic solvent was then ultrasonically mixed with organic waste salt to obtain a mixture; the mixture was subjected to solid-liquid separation to obtain wet salt and solvent; the wet salt was thoroughly washed, and the washing liquid and salt were collected; the hydrogen bond acceptor was a quaternary ammonium salt. The hydrogen bond donor is an organic nitrogen compound or a polyol.

2. The method for treating organic waste salts by eutectic solvent extraction according to claim 1, characterized in that, The hydrogen bond acceptor includes one or more of choline chloride, tetrabutylammonium chloride, or quaternized polyamine.

3. The method for treating organic waste salts by eutectic solvent extraction according to claim 2, characterized in that, The organic nitrogen compound includes one or more of urea, monoethanolamine, or diethanolamine; the polyol includes one or more of glycerol, ethylene glycol, or propylene glycol.

4. The method for treating organic waste salts by eutectic solvent extraction according to claim 1, characterized in that, The molar ratio of hydrogen bond acceptor to hydrogen bond donor is 1:1~5; the mass ratio of the organic waste salt to the eutectic solvent is 1:1~5.

5. The method for treating organic waste salts by eutectic solvent extraction according to claim 1, characterized in that, The ultrasonic power is 100~200W; the ultrasonic frequency is 20~30kHz; the ultrasonic time is 10~20min; the preparation temperature is 50~80℃; the preparation time is 20~40min; the mixing temperature is 25~60℃; and the mixing time is 20~35min.

6. The method for treating organic waste salts by eutectic solvent extraction according to claim 1, characterized in that, Disperse the wet salt in ethanol at a mass ratio of 1:1 to 1.5, then separate and collect the salt and washing liquid.

7. The method for treating organic waste salts by eutectic solvent extraction according to claim 1, characterized in that, The solvent and washing solution were purified, and the eutectic solvent was recovered.

8. The method for treating organic waste salts by eutectic solvent extraction according to claim 7, characterized in that, The purification process involves filtering the solvent and washing solution, followed by dehydration; and then distilling under reduced pressure at 75-85°C to recover the eutectic solvent.

9. The application of the method for treating organic waste salts by eutectic solvent extraction according to any one of claims 1 to 8 in wastewater treatment, characterized in that, The organic waste salt contains one or more types of organic matter.

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