A method for treating organic amine wastewater

Abstract

This invention provides a method for treating organic amine wastewater, comprising the following steps: (1) subjecting the organic amine wastewater to pH adjustment and sedimentation treatment sequentially to obtain neutralized wastewater with a pH value of 8-10; (2) subjecting the neutralized wastewater to adsorption treatment by contacting it with an aerogel composite material to obtain an organic amine concentration not exceeding 15 mg·L⁻¹. ‑1 The wastewater after treatment and the saturated aerogel composite material; wherein the surface of the aerogel composite material includes at least one of hydroxyl, carboxyl, and sulfonic acid functional groups; the particle size range of the aerogel composite material is 5-50 nm, and the specific surface area is 350-700 m². 2 / g, pore volume is 0.05-0.5mL / g, and average pore size is 0.2-2.5nm; the method is simple and easy to implement, with low operating cost, and can deeply adsorb organic amine substances in wastewater, reduce the concentration of organic amines in wastewater, better meet the requirements of downstream biochemical treatment, and solve the comprehensive treatment problem of traditional organic amine wastewater.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and specifically relates to a method for treating organic amine wastewater. Background Technology

[0002] In the field of wastewater treatment, how to remove nutrients such as nitrogen and phosphorus and prevent eutrophication of water bodies has been a problem that researchers have been trying to solve. Currently, methods for phosphorus removal have become increasingly sophisticated and have achieved good results. However, due to the diverse types of nitrogen in wastewater, especially wastewater containing organic amines, it is difficult to achieve efficient treatment.

[0003] Organic amines are important chemical raw materials with wide applications in pesticides, pharmaceuticals, rubber, synthetic dyes, petroleum, leather tanning, detergents, and organic synthesis and inorganic chemical industries. There are many types of organic amines, mainly including monomethylamine, dimethylamine, trimethylamine, dimethylformamide, dimethylacetamide, and N-methylpyrrolidone. Because each product's production process leaves residual raw materials and intermediates in the wastewater, the main components of this wastewater are methylamine, methanol, sodium methoxide, dimethylformamide, dimethylacetamide, N-methylpyrrolidone, and some nitrogen-containing heterocyclic substances. Therefore, organic amine wastewater is complex in composition, toxic and harmful, difficult to biodegrade, high in nitrogen and low in carbon, and exhibits large fluctuations in water quality and quantity, making it a challenging type of industrial wastewater to treat.

[0004] Currently, existing technologies for treating organic amine wastewater mainly include physical, chemical, and biochemical methods. Physical and chemical methods utilize basic physical and chemical properties to achieve separation, degradation, and recovery. Physical methods primarily include distillation, extraction, stripping, and gas stripping, and are generally suitable for high-concentration organic amine wastewater. Chemical methods mainly include oxidation treatments such as the Fenton process, photocatalysis, electrocatalysis, and chemical catalysis. These methods require large amounts of reagents, easily lead to secondary pollution, and the oxidants cannot be recovered. Biochemical methods utilize the growth, development, and metabolism of microorganisms to convert dissolved organic amine substances into biological cytoplasm, thereby achieving the degradation of pollutants. Biochemical methods are currently the most commonly used methods for treating organic amine wastewater, mainly including aerobic biological treatment, anaerobic biological treatment, and their combined processes.

[0005] However, organic amine wastewater possesses a certain degree of biotoxicity, and direct biological treatment of it can severely damage the biological treatment system. Although domesticated organic amine-tolerant microorganisms can meet the wastewater treatment requirements, changes in the concentration of organic amines in the wastewater can lead to metabolic changes in these microorganisms, reducing their ability to degrade organic matter. It is evident that direct biological treatment of organic amine wastewater is challenging, typically requiring unit operations such as equalization tanks, anaerobic reactors, short-cut denitrification / anaerobic ammonia oxidation reactors, aerobic reactors, and sedimentation tanks. This presents a complex process flow and requires high concentrations of organic amines in the wastewater. Therefore, biological methods are often combined with other methods as a post-treatment process for organic amine wastewater. Currently, there is an urgent need to find a simple and easy-to-implement method for treating organic amine wastewater that exhibits good selective adsorption of organic amine pollutants. Summary of the Invention

[0006] This invention provides a method for treating organic amine wastewater, which solves the problems of selective removal of organic amines from wastewater and complex operation in the prior art.

[0007] This invention provides a method for treating organic amine wastewater, comprising the following steps:

[0008] (1) The organic amine wastewater was subjected to pH adjustment and sedimentation treatment in sequence to obtain neutralized wastewater with a pH value of 8-10;

[0009] (2) The neutralized wastewater is contacted with the aerogel composite material for adsorption treatment to obtain an organic amine concentration of not more than 15 mg·L⁻¹. -1 Wastewater and saturated aerogel composite materials after treatment;

[0010] The surface of the aerogel composite material includes at least one of hydroxyl, carboxyl, and sulfonic acid functional groups; the particle size of the aerogel composite material ranges from 5 to 50 nm, and the specific surface area is 350 to 700 m². 2 / g, pore volume is 0.05-0.5mL / g, and average pore size is 0.2-2.5nm.

[0011] Furthermore, in step (2), the particle size range of the aerogel composite material is 10-30 nm, and the specific surface area is 450-600 m². 2 / g, pore volume is 0.15-0.35mL / g, and average pore size is 0.7-2nm.

[0012] Furthermore, the concentration of organic amines in the organic amine wastewater is 500-3000 mg·L⁻¹. -1 .

[0013] Furthermore, the mass ratio of the organic amine in the neutralized wastewater to the mass of the aerogel composite material is (10-100):1, the adsorption treatment time is 60-480 min, and the adsorption treatment temperature is 20-60℃.

[0014] Furthermore, the adsorption treatment is carried out using an adsorption bed, wherein the empty bed gas velocity of the adsorption bed is 2000-6000 h⁻¹. -1 The apparent gas velocity is 0.05-0.5 m / s, and the bed pressure drop is 2-6 kPa.

[0015] Furthermore, it also includes step (3), which involves contacting the saturated aerogel composite material with an eluent for elution treatment to obtain a regenerated aerogel composite material and a desorption liquid; and then having the regenerated aerogel composite material participate in the adsorption treatment again.

[0016] Further, the mass ratio of the eluent to the saturated aerogel composite material is (5-50):1, the desorption treatment time is 60-480 min, and the desorption temperature is 20-60℃.

[0017] Furthermore, it also includes step (4), concentrating the desorption solution to obtain an organic amine product and a regenerated eluent; and allowing the regenerated eluent to participate in the elution process again.

[0018] Furthermore, the concentration process includes at least one of evaporation, distillation, and membrane separation; and / or,

[0019] The eluent includes at least one of water, steam, hydrochloric acid, sulfuric acid, nitric acid, formic acid, acetic acid, or hot air; and / or,

[0020] The organic amine wastewater is subjected to pH adjustment treatment using a pH adjuster, wherein the pH adjuster includes at least one selected from hydrochloric acid, nitric acid, formic acid, acetic acid, phosphoric acid, and sulfuric acid; and / or,

[0021] The organic amine wastewater is subjected to sedimentation treatment using a sedimentation agent, wherein the sedimentation agent includes at least one of aluminum sulfate, alum, sodium aluminate, ferric chloride, ferrous sulfate, ferric sulfate polyacrylamide, and polyimide.

[0022] Furthermore, step (2) also includes biochemical treatment of the treated wastewater.

[0023] This invention provides a method for treating organic amine wastewater, which involves pH adjustment and sedimentation, and the use of particles with at least one of hydroxyl, carboxyl, and sulfonic acid functional groups on their surface, with a particle size range of 5-50 nm and a specific surface area of ​​350-700 m². 2An aerogel composite material with a pore volume of 0.05-0.5 mL / g and an average pore size of 0.2-2.5 nm was brought into full contact with organic amine wastewater for selective adsorption treatment, ensuring that the concentration of organic amines in the treated wastewater did not exceed 15 mg·L⁻¹. -1 The method is simple and easy to implement, with low operating costs. It can deeply adsorb organic amine substances in wastewater and reduce the concentration of organic amines in wastewater, thus better meeting the requirements of downstream biochemical treatment and solving the comprehensive treatment problem of traditional organic amine wastewater. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] This invention provides a method for treating organic amine wastewater, comprising the following steps:

[0026] (1) The organic amine wastewater was subjected to pH adjustment and sedimentation treatment in sequence to obtain neutralized wastewater with a pH value of 8-10;

[0027] (2) The neutralized wastewater was contacted with the aerogel composite material for adsorption treatment to obtain an organic amine concentration of no more than 15 mg·L⁻¹. -1 Wastewater and saturated aerogel composite materials after treatment;

[0028] The surface of the aerogel composite material includes at least one of hydroxyl, carboxyl, and sulfonic acid functional groups; the particle size range of the aerogel composite material is 5-50 nm, and the specific surface area is 350-700 m². 2 / g, pore volume is 0.05-0.5mL / g, and average pore size is 0.2-2.5nm.

[0029] The organic amine wastewater of this invention refers to wastewater containing residual raw materials and intermediate products generated during the production of organic amine products. Since there are many types of organic amines, including monomethylamine, dimethylamine, trimethylamine, dimethylformamide, dimethylacetamide, N-methylpyrrolidone, etc., the composition of organic amine wastewater is also relatively complex, mainly including methylamine, methanol, sodium methoxide, dimethylformamide, dimethylacetamide, N-methylpyrrolidone, and some nitrogen-containing heterocyclic substances.

[0030] In step (1), the organic amine wastewater is subjected to pH adjustment and sedimentation treatment in sequence to obtain neutralized wastewater with a pH value of 8-10. Generally, organic amine wastewater is strongly alkaline and requires the addition of pH adjuster to adjust the pH value to 8-10. In addition, since there are suspended solids in the organic amine wastewater itself and precipitated impurities may be generated during the pH adjustment process, a sedimentation agent needs to be added to remove the suspended solids. This invention does not limit the type of pH adjuster and can be selected from at least one of hydrochloric acid, nitric acid, formic acid, acetic acid, phosphoric acid or sulfuric acid. This invention also does not limit the type of sedimentation agent and can be selected from at least one of aluminum sulfate, alum, sodium aluminate, ferric chloride, ferrous sulfate, ferric sulfate polyacrylamide or polyimide. It is understood that after step (1), the neutralized wastewater also needs to be filtered or centrifuged to remove the solid particles.

[0031] In step (2), the neutralized wastewater is treated by adsorption using aerogel composite material as an adsorbent until the concentration of organic amines is no higher than 15 mg·L⁻¹. -1 The wastewater after treatment, and the saturated aerogel composite material adsorbed with organic amines; wherein the surface of the aerogel composite material includes at least one of hydroxyl, carboxyl, and sulfonic acid functional groups; the particle size range of the aerogel composite material is 5-50 nm, and the specific surface area is 350-700 m². 2 The aerogel composite material, with a pore volume of 0.05-0.5 mL / g and an average pore size of 0.2-2.5 nm, exhibits significant effects in adsorbing organic amine pollutants in wastewater under the aforementioned parameters. It achieves selective adsorption of organic amines in wastewater, ensuring that the concentration of organic amines in the treated wastewater does not exceed 15 mg·L⁻¹. -1 ;

[0032] This invention does not limit the source of aerogel composite materials, as long as the surface includes at least one of hydroxyl, carboxyl, and sulfonic acid functional groups, and the particle size ranges from 5-50 nm and the specific surface area is 350-700 m². 2 Any aerogel composite material with a pore volume of 0.05-0.5 mL / g and an average pore size of 0.2-2.5 nm can be used; in one specific embodiment, the present invention uses HUALU-Pyshield Lite type aerogel composite material.

[0033] This invention provides a method for treating organic amine wastewater. The method involves pH adjustment and sedimentation to obtain neutralized wastewater with a pH of 8-10. The wastewater is then treated using particles containing at least one of hydroxyl, carboxyl, and sulfonic acid functional groups on their surface, with a particle size range of 5-50 nm and a specific surface area of ​​350-700 m². 2Aerogel composite materials with a pore volume of 0.05-0.5 mL / g and an average pore size of 0.2-2.5 nm were used to selectively adsorb and treat neutralized wastewater, ensuring that the concentration of organic amines in the treated wastewater did not exceed 15 mg·L⁻¹. -1 This can better meet the requirements of downstream biochemical treatment.

[0034] Furthermore, in step (2), the particle size range of the aerogel composite material is 10-30 nm, and the specific surface area is 450-600 m². 2 / g, pore volume is 0.15-0.35mL / g, and average pore size is 0.7-2nm.

[0035] The inventors discovered that by further refining the dimensional parameters of the aerogel composite material, the particle size range of the aerogel composite material is 10-30 nm, and the specific surface area is 450-600 m². 2 When the concentration of organic amines in the treated wastewater is 0.15-0.35 mL / g, the pore volume is 0.15-0.35 mL / g, and the average pore size is 0.7-2 nm, the concentration of organic amines in the treated wastewater can be kept below 10 mg·L⁻¹. -1 This allows for better fulfillment of the requirements of downstream biochemical treatment.

[0036] In one specific embodiment, the concentration of organic amines in the organic amine wastewater is 500-3000 mg·L. - 1 1 .

[0037] The initial concentration of organic amines in organic amine wastewater affects the treatment efficiency. The inventors discovered that when the concentration of organic amines in the wastewater is 500-3000 mg·L⁻¹, the treatment efficiency is significantly improved. -1 Furthermore, the treatment method provided by this invention has a better effect on the treatment of organic amine wastewater and can further reduce the concentration of organic amines in the wastewater.

[0038] Furthermore, the mass ratio of organic amines in the neutralized wastewater to the mass of the aerogel composite material is (10-100):1, the adsorption treatment time is 60-480 min, and the adsorption treatment temperature is 20-60℃.

[0039] It is understandable that the higher the concentration of organic amines in wastewater, the more adsorbent is required and the longer the adsorption time. Through research, the inventors found that when the mass ratio of organic amines in the wastewater to the mass of the aerogel composite material is (10-100):1, the adsorption treatment time is 60-480 min, and the adsorption treatment temperature is 20-60℃, the treatment effect can be further improved and the organic amine content in the wastewater can be reduced.

[0040] Optionally, the adsorption treatment is carried out using an adsorption bed, with an empty bed gas velocity of 2000-6000 h⁻¹. -1The apparent gas velocity is 0.05-0.5 m / s, and the bed pressure drop is 2-6 kPa.

[0041] Since adsorption treatment requires sufficient contact between the aerogel composite material and the organic amine wastewater, an adsorption bed can be selected. This is achieved by further defining the parameters of the adsorption bed, specifically, the empty bed gas velocity of the adsorption bed is set to 2000-6000 h⁻¹. -1 When the apparent gas velocity is 0.05-0.5 m / s and the bed pressure drop is 2-6 kPa, the adsorption efficiency of aerogel composite materials for organic amine wastewater can be further improved, the treatment time can be further shortened, and the concentration of organic amines in the wastewater can be further reduced.

[0042] In one specific embodiment, the method further includes step (3), which involves contacting the saturated aerogel composite material with the eluent for elution treatment to obtain a regenerated aerogel composite material and a desorption liquid; and then allowing the regenerated aerogel composite material to participate in the adsorption treatment again.

[0043] Since the aerogel composite material used in this invention is a regenerable adsorbent, in order to meet the requirements of environmental protection, cost reduction and no consumption of auxiliary materials, the saturated aerogel composite material that has adsorbed organic amines can be contacted with an eluent for elution treatment to regenerate the aerogel composite material, resulting in a regenerated aerogel composite material with organic amines removed and a desorption liquid containing dissolved organic amines. The regenerated aerogel composite material can then participate in the adsorption treatment of organic amine wastewater, so that the treatment method does not require the consumption of auxiliary materials and reduces operating costs.

[0044] Furthermore, the mass ratio of eluent to saturated aerogel composite material is (5-50):1, the desorption treatment time is 60-480 min, and the desorption temperature is 20-60℃.

[0045] It is understandable that aerogel composites adsorbed with organic amines need to be regenerated by adding an eluent. The inventors discovered that when the mass ratio of the eluent to the saturated aerogel composite is (5-50):1, the desorption treatment time is 60-480 min, and the desorption temperature is 20-60℃, the adsorption capacity of the aerogel composite can be better regenerated, and the cost can be reduced.

[0046] Furthermore, it also includes step (4), which involves concentrating the desorption solution to obtain an organic amine product and a regenerated eluent; and then having the regenerated eluent participate in the elution process again.

[0047] Since the desorption solution contains a large amount of eluted organic amines, direct discharge not only pollutes the environment but also wastes organic amine raw materials. Therefore, the desorption solution is concentrated to separate the organic amines from the desorption solution, obtaining organic amine products and regenerated eluent. Furthermore, the regenerated eluent, from which the organic amines have been removed, is used again to elute saturated aerogel composite materials. By switching between adsorption and elution treatment, the applicability of the treatment method to organic amine wastewater concentrations can be further improved, and costs can be further reduced.

[0048] In one specific embodiment, the concentration process includes at least one of evaporation, distillation, and membrane separation.

[0049] It is understood that the concentration process is used to separate the organic amines from the eluent in the desorption solution. This invention does not limit the specific method of concentration process, and may include at least one of evaporation, distillation and membrane separation; further reducing costs and obtaining organic amine products;

[0050] In another specific embodiment, the eluent includes at least one of water, water vapor, hydrochloric acid, sulfuric acid, nitric acid, formic acid, acetic acid, or hot air;

[0051] The pH of organic amine wastewater is adjusted using a pH adjuster, wherein the pH adjuster includes at least one selected from hydrochloric acid, nitric acid, formic acid, acetic acid, phosphoric acid, and sulfuric acid; and / or,

[0052] Organic amine wastewater is treated by settling using a settling agent, wherein the settling agent includes at least one of aluminum sulfate, alum, sodium aluminate, ferric chloride, ferrous sulfate, ferric sulfate polyacrylamide, and polyimide.

[0053] Furthermore, step (2) also includes biochemical treatment of the treated wastewater.

[0054] The method for treating organic amine wastewater provided by this invention can ensure that the concentration of organic amines in the treated wastewater does not exceed 15 mg·L⁻¹. -1 It can meet the index requirements of ordinary biological treatment. Therefore, direct biological treatment of the treated wastewater can further reduce the nitrogen content and COD in the wastewater, and achieve further purification of the wastewater.

[0055] The following detailed description of a method for treating organic amine wastewater provided by the present invention is provided through specific embodiments.

[0056] Example 1

[0057] (1) Hydrochloric acid was added to the organic amine wastewater for pH adjustment, and then polyacrylamide was added for sedimentation treatment to obtain neutralized wastewater with a pH value of 8.3;

[0058] (2) The neutralized wastewater and the aerogel composite material were contacted in an adsorption bed for adsorption treatment. The mass ratio of organic amines in the added neutralized wastewater to the mass of the aerogel composite material was 10:1. The adsorption treatment time was 240 min, and the adsorption treatment temperature was 40℃, resulting in treated wastewater and saturated aerogel composite material. The aerogel composite material was of model HUALU-Pyshield Lite, and its surface included hydroxyl, carboxyl, and sulfonic acid functional groups. The particle size was 20 nm, and the specific surface area was 550 m². 2 / g, pore volume is 0.2mL / g, average pore size is 1.3nm; adsorption bed empty gas velocity is 4000h / g. -1 The apparent gas velocity is 0.25 m / s, and the bed pressure drop is 4.2 kPa.

[0059] Example 2

[0060] The difference between this embodiment and embodiment 1 is that in step 2), the mass ratio of the organic amine added to the neutralized wastewater to the aerogel composite material is 110:1.

[0061] Example 3

[0062] The difference between this embodiment and embodiment 1 is that in step 2), the adsorption treatment time is 30 minutes.

[0063] Example 4

[0064] The difference between this embodiment and embodiment 1 is that in step 2), the adsorption treatment temperature is 15°C.

[0065] Example 5

[0066] The difference between this embodiment and Embodiment 1 is that in step 2), the empty bed gas velocity of the adsorption bed is 7000 h⁻¹. -1 .

[0067] Example 6

[0068] The difference between this embodiment and Embodiment 1 is that in step 2), the apparent gas velocity of the adsorption bed is 0.6 m / s.

[0069] Example 7

[0070] The difference between this embodiment and embodiment 1 is that in step 2), the pressure drop of the adsorption bed is 1.5 kPa.

[0071] Example 8

[0072] The difference between this embodiment and Embodiment 1 is that it also includes:

[0073] Step (3) involves contacting the saturated aerogel composite material with hydrochloric acid for elution treatment to obtain a regenerated aerogel composite material and a desorption solution; the regenerated aerogel composite material is then subjected to adsorption treatment again; wherein the mass ratio of the saturated aerogel composite material to the eluent is 1:30, the desorption treatment time is 360 min, and the desorption temperature is 40℃.

[0074] Step (4): Distill the desorption solution to obtain organic amine products and regenerated eluent; then allow the regenerated eluent to participate in the elution process.

[0075] Comparative Example 1

[0076] The difference between this comparative example and Example 1 is that in step (2), the neutralized wastewater is contacted with ZHF activated carbon in an adsorption bed for adsorption treatment; wherein, the particle size range of the activated carbon is 30 nm and the specific surface area is 600 m². 2 / g, pore volume is 0.15mL / g, average pore size is 1.5nm

[0077] Comparative Example 2

[0078] The difference between this comparative example and Example 1 is that in step (2), the neutralized wastewater is brought into contact with HJ-1 resin in the adsorption bed for adsorption treatment;

[0079] Among them, the particle size range of HJ-1 resin is 50nm, and the specific surface area is 500m². 2 / g, pore volume is 0.3mL / g, and average pore size is 13nm.

[0080] Comparative Example 3

[0081] The difference between this comparative example and Example 1 is that in step (2), the aerogel composite material prepared by the atmospheric pressure drying method does not include hydroxyl, carboxyl and sulfonic acid functional groups on its surface.

[0082] Experimental Example 1

[0083] Organic amine wastewater was treated using the methods described in the above embodiments and comparative examples. The COD value of the treated wastewater was determined by potassium dichromate method, the TN value was determined by sodium reagent spectrophotometry, the organic amine content was determined by gas chromatography-mass spectrometry, the suspended solids content was determined by muffle furnace combustion-gravimetric method, and the pH value was determined by pH meter. The water quality analysis results are shown in Table 1.

[0084] The COD of the original organic amine wastewater used in this experiment was 15000 mg·L⁻¹. -1 TN is 3000 mg·L -1 The organic amine content was 2050 mg·L⁻¹. -1 The suspended solids content was 850 mg·L⁻¹. -1 The pH value is 12.0.

[0085] Table 1

[0086]

[0087]

[0088] Experimental Example 2

[0089] The organic amine wastewater was treated using the methods described in the above embodiments and comparative examples. The COD value of the treated wastewater was determined by potassium dichromate method, the TN value was determined by sodium reagent spectrophotometry, the organic amine content was determined by gas chromatography-mass spectrometry, the suspended solids content was determined by muffle furnace combustion-gravimetric method, and the pH value was determined by pH meter. The water quality analysis results are shown in Table 2.

[0090] The original organic amine water used in this experiment had a COD of 20,000 mg / L. -1 TN is 4700 mg·L -1 The organic amine content was 3850 mg·L⁻¹. -1 The suspended solids content was 1060 mg·L⁻¹ -1 The pH value is 12.9.

[0091] Table 2

[0092]

[0093] As shown in Tables 1 and 2, the method for treating organic amine wastewater provided by this invention can effectively treat wastewater of different treatment volumes, and the organic amine content in the wastewater is greatly reduced after treatment, ensuring that the organic amine concentration does not exceed 15 mg·L⁻¹. -1 This can better meet the requirements of downstream biochemical treatment.

[0094] 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 the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for treating organic amine wastewater, characterized by, The method comprises the following steps: (1) sequentially performing pH adjustment treatment and sedimentation treatment on the organic amine wastewater to obtain neutralized wastewater with a pH value of 8-10; the organic amine wastewater comprises methylamine, methanol, sodium methoxide, dimethylformamide, dimethylacetamide, N-methylpyrrolidone and nitrogen-containing heterocyclic substances; (2) The neutralized wastewater is contacted with aerogel composite material for adsorption treatment, to obtain treated wastewater with organic amine concentration not higher than 15 mg·L -1 of saturated aerogel composite material; the model of the aerogel composite material is HUALU-Pyshield Lite; The surface of the aerogel composite comprises hydroxyl, carboxyl and sulfonic acid functional groups; the particle size of the aerogel composite ranges from 10 to 30 nm, the specific surface area ranges from 450 to 600 m 2 / g, the pore volume ranges from 0.15 to 0.35 mL / g, and the average pore size ranges from 0.7 to 2 nm. The organic amine concentration in the organic amine wastewater is 500-3000 mg·L -1 ; The adsorption treatment is carried out by using an adsorption bed, the empty bed gas speed of the adsorption bed is 2000-6000h -1 , the apparent gas speed is 0.05-0.5m / s, and the bed layer pressure drop is 2-6kpa; The ratio of the mass of the organic amine in the neutralized wastewater to the mass of the aerogel composite material is (10-100):1, the adsorption treatment time is 60-480 min, and the adsorption treatment temperature is 20-60℃.

2. The treatment method according to claim 1, characterized in that, The method further comprises step (3) of contacting the saturated aerogel composite material with an eluent to perform elution treatment, to obtain a regenerated aerogel composite material and a desorption liquid; and causing the regenerated aerogel composite material to participate in the adsorption treatment again.

3. The treatment method according to claim 2, characterized in that, The mass ratio of the eluent to the saturated aerogel composite material is (5-50):1, the desorption treatment time is 60-480 min, and the desorption temperature is 20-60℃.

4. The treatment method according to claim 2 or 3, characterized in that, The method further comprises step (4) of performing concentration treatment on the desorption liquid to obtain an organic amine product and a regenerated eluent; and causing the regenerated eluent to participate in the elution treatment again.

5. The treatment method according to claim 4, characterized in that, The concentration treatment comprises at least one of evaporation, distillation and membrane separation; and / or, The eluent comprises at least one of water, water vapor, hydrochloric acid, sulfuric acid, nitric acid, formic acid, acetic acid and hot air; and / or, The pH adjustment treatment on the organic amine wastewater is performed by using a pH adjuster, wherein the pH adjuster comprises at least one of hydrochloric acid, nitric acid, formic acid, acetic acid, phosphoric acid and sulfuric acid; and / or, The sedimentation treatment on the organic amine wastewater is performed by using a sedimentation agent, wherein the sedimentation agent comprises at least one of aluminum sulfate, alum, sodium aluminate, ferric trichloride, ferrous sulfate, ferric sulfate, polyacrylamine and polyimide.

6. The treatment method of claim 1, wherein In step (2), the method further comprises performing biochemical treatment on the treated wastewater.

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