Treatment method of N,N-dimethylacetamide wastewater

Abstract

The present application relates to a method for treating N,N-dimethylacetamide wastewater. Reagent A and reagent B are provided; wherein, the reagent A is activated carbon for solid-loaded iron ions; the reagent B is an aqueous solution of hydrogen peroxide; the reagent A and the reagent B are sequentially added to N,N-dimethylacetamide wastewater to react. The above-mentioned method for treating N,N-dimethylacetamide wastewater, the activated carbon for solid-loaded iron ions is coordinated with the aqueous solution of hydrogen peroxide, has an excellent decomposition effect on the N,N-dimethylacetamide in N,N-dimethylacetamide wastewater, and has a high decomposition efficiency. Meanwhile, the operation of wastewater treatment is simple, the operation safety is high, the energy consumption is low, and the material is green and environmentally friendly, and the cost is low.

Description

Technical Field

[0001] The present application relates to the field of industrial wastewater treatment, and in particular to a method for treating N,N-dimethylacetamide wastewater. Background Art

[0002] N,N-dimethylacetamide (DMAc) is a non-proton, highly polar solvent with a slight ammonia odor. It has strong solubility and can dissolve a wide range of substances. It is miscible with water, aromatic compounds, esters, ketones, alcohols, ethers, benzene, and chloroform, and can activate compound molecules. Therefore, it is widely used as a solvent and catalyst.

[0003] During the production process of cefuroxime, wastewater contains a large amount of DMAc, which needs to be treated before it can be discharged. Traditional methods for treating DMAc wastewater include:

[0004] (1) In 2010, Li Jie et al. used iron-carbon micro-electrolysis-Fenton reagent to treat DMAc wastewater. After micro-electrolysis treatment, the -CH3 and C=O groups of DMAC can be destroyed. After Fenton oxidation, -NH- is destroyed, and finally the DMAC macromolecule is converted into a small molecule.

[0005] (2) In 2012, Duan Nini et al. used the UASB method to treat DMAc wastewater, which is a biochemical method for treating wastewater. In addition, in 2017, Lu Xiaopan et al. used anaerobic-aerobic biological fluidized bed coupling to treat DMAc wastewater, in which glucose and ammonium chloride were used as external carbon sources and nitrogen sources, and the CODCr / NH 4+ -N≤2, hydraulic retention time (HRT) 14.9h for wastewater treatment;

[0006] (3) In 2018, Yin Yurong et al. used activated carbon fiber adsorption-iron-carbon electrolysis to treat DMAc wastewater;

[0007] (4) In 2018, Zhang Lifu et al. used ultraviolet catalytic ozone to oxidize DMAc in wastewater.

[0008] Although the above-mentioned DMAc wastewater treatment methods can achieve certain treatment effects, they all have disadvantages such as high energy consumption, expensive materials, and complex operations. Summary of the Invention

[0009] Based on this, the present application provides a method for treating N,N-dimethylacetamide (DMAc) wastewater with good treatment effect, low energy consumption and cost, and simple operation.

[0010] The present application provides a method for treating N,N-dimethylacetamide wastewater, comprising the following steps:

[0011] Reagent A and reagent B are provided; wherein, reagent A is activated carbon immobilized with iron ions; and reagent B is an aqueous solution of hydrogen peroxide;

[0012] The reagent A and the reagent B are sequentially added into N,N-dimethylacetamide wastewater to carry out a reaction.

[0013] In one embodiment, the reaction temperature is 30°C to 65°C; further, the reaction temperature is 35°C to 65°C or 45°C to 65°C; further, the reaction temperature is 45°C to 55°C.

[0014] In one embodiment, the pH of the reaction is controlled to be 3.5-7; further, the pH of the reaction is controlled to be 3.5-5.5; further, the pH of the reaction is controlled to be 3.5-4.5 or 4.6-5.5.

[0015] In one embodiment, the mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the activated carbon in the reagent A is 1:(2-10); further, the mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the activated carbon in the reagent A is 1:(3-6); further, the mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the activated carbon in the reagent A is 1:(3-3.5) or 1:(3.7-4.1) or 1:(4.2-5).

[0016] In one embodiment, the mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the hydrogen peroxide in the reagent B is 1:(0.3-15); further, the mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the hydrogen peroxide in the reagent B is 1:(5-15); further, the mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the hydrogen peroxide in the reagent B is 1:(5-7) or 1:(8-9) or 1:(10-13).

[0017] In one embodiment, the molar ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the iron ions in the reagent A is 1:(0.76-5); further, the molar ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the iron ions in the reagent A is 1:(1.2-5); further, the molar ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the iron ions in the reagent A is 1:(1.4-5); further, the molar ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the iron ions in the reagent A is 1:(1.4-1.6) or 1:(1.8-2.5) or 1:(2.6-4) or 1:(4.2-5).

[0018] In one embodiment, the iron ion is a trivalent iron ion; further, the salt of the iron ion is one or more of FeCl3, FeCl3·6H2O, FeBr3, Fe2(SO4)3 and Fe(CH3COO)3.

[0019] In one embodiment, the iron ion salt is one or more of FeCl3, FeCl3·6H2O and FeBr3.

[0020] In one embodiment, the mass concentration of hydrogen peroxide in the aqueous solution of hydrogen peroxide is 20% to 35%.

[0021] In one embodiment, the N,N-dimethylacetamide wastewater is N,N-dimethylacetamide wastewater generated during the synthesis of cefuroxime.

[0022] The above-mentioned N,N-dimethylacetamide wastewater treatment method combines activated carbon loaded with iron ions with an aqueous solution of hydrogen peroxide, achieving excellent decomposition of N,N-dimethylacetamide in the wastewater with high decomposition efficiency. Furthermore, the wastewater treatment process is simple, safe, energy-efficient, and environmentally friendly, with low cost.

[0023] Furthermore, by optimizing the types of raw materials, the ratios between the raw materials, and the condition parameters of the wastewater treatment process, with the overall coordination of all optimized parameters, the above treatment method can ultimately significantly reduce the N,N-dimethylacetamide content in N,N-dimethylacetamide wastewater while maintaining low energy consumption and low cost. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the N,N-dimethylacetamide wastewater treatment method of the present application in conjunction with specific examples. The present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0026] As used herein, "one or more" refers to any one, any two, or any two or more of the listed items.

[0027] In this application, terms such as "first aspect" and "second aspect" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor as implicitly indicating the importance or quantity of the technical features indicated. Furthermore, terms such as "first" and "second" serve only as non-exhaustive enumeration and description and should not constitute a closed-ended limitation on quantity.

[0028] In this application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0029] In this application, when referring to numerical ranges, unless otherwise specified, the numerical ranges are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges subsumed therein.

[0030] Unless otherwise specified, the percentage contents mentioned in this application refer to mass percentage for solid-liquid mixture and solid-solid mixture, and refer to volume percentage for liquid-liquid mixture.

[0031] The percentage concentrations mentioned in this application, unless otherwise specified, refer to the final concentration, which refers to the percentage of the added component in the system after the addition of the component.

[0032] The temperature parameters in this application, unless otherwise specified, allow for both constant temperature treatment and treatment within a certain temperature range. The constant temperature treatment allows for temperature fluctuations within the precision range of instrument control.

[0033] An example of the present application provides a method for treating N,N-dimethylacetamide wastewater, comprising the following steps:

[0034] Reagent A and reagent B are provided; wherein, reagent A is activated carbon immobilized with iron ions; and reagent B is an aqueous solution of hydrogen peroxide;

[0035] The reagent A and the reagent B are sequentially added into N,N-dimethylacetamide wastewater to carry out a reaction.

[0036] In one example, the method for preparing the reagent A comprises the following steps:

[0037] mixing the iron ion salt with water to prepare an aqueous solution of iron ions;

[0038] The reagent A is prepared by mixing the aqueous solution of iron ions with the activated carbon.

[0039] In one example, the acidic powdered activated carbon has a specific surface area of ​​800 to 1200 square meters per gram.

[0040] In one example, mixing is performed until the material is semi-solid.

[0041] In one example, the mass ratio of the iron ion salt to water is: (0.5-2): 1. Specifically, the mass ratio of the iron ion salt to water includes but is not limited to: 0.5:1, 0.7:1, 0.8:1, 0.9:1, 0.94:1, 1:1, 1.08:1, 1.1:1, 1.16:1, 1.2:1, 1.4:1, 1.5:1, 1.57:1, 1.6:1, 1.65:1, 1.7:1, 1.72:1, 1.75:1, 1.8:1, 1.9:1, and 2:1.

[0042] In one example, the reaction temperature is 30°C to 65°C. Specifically, the reaction temperature includes but is not limited to: 30°C, 32°C, 35°C, 38°C, 40°C, 42°C, 45°C, 48°C, 50°C, 52°C, 55°C, 58°C, 60°C, 62°C, and 65°C. Furthermore, the reaction temperature is 35°C to 65°C or 45°C to 65°C; further, the reaction temperature is 45°C to 55°C.

[0043] In one example, the reaction time is 0.5 h to 5 h. Specifically, the reaction time includes but is not limited to: 0.5 h, 1 h, 1.5 h, 2 h, 3 h, 4 h, 5 h. Further, the reaction time is 0.5 h to 2 h.

[0044] In one example, the pH of the reaction is controlled to be 3.5 to 7. Specifically, the pH of the reaction includes but is not limited to: 3.5, 4, 4.5, 4.6, 5, 5.5, 6, 6.5, 7. Furthermore, the pH of the reaction is controlled to be 3.5 to 5.5 or 3.5 to 4.5 or 4.6 to 5.5.

[0045] In one example, the mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the activated carbon in the reagent A is 1:(2-10). Specifically, the mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the activated carbon in the reagent A includes but is not limited to: 1:2, 1:2.2, 1:2.4, 1:2.5, 1:2.7, 1:2.9, 1:3, 1:3.2, 1:3.4, 1:3.5, 1:3.7, 1:3.9, 1:4, 1:4.1, 1:4.2, 1:4.4, 1:4.5, 1:4.6, 1:4.8, 1:5, 1:5.5, 1:6, 1:7, 1:8, 1:9, 1:10. Furthermore, the mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the activated carbon in the reagent A is 1:(3-8), 1:(3-6), 1:(3-5), 1:(3-4) or 1:(3-3.5) or 1:(3.7-4.1) or 1:(4.2-5).

[0046] In one example, the mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the hydrogen peroxide in the reagent B is 1:(0.3-15). Specifically, the mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the hydrogen peroxide in the reagent B includes but is not limited to: 1:0.3, 1:0.35, 1:0.4, 1:0.43, 1:0.45, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.82, 1:0.85, 1:0.9, 1:1, 1:1.2, 1: 1:15. Further, the mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the hydrogen peroxide in the reagent B is: (5-15), 1:(5-12), 1:(5-8) or 1:(5-7) or 1:(8-9) or 1:(10-13).

[0047] In one example, the molar ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the iron ions in the reagent A is 1:(0.76-5). Specifically, the molar ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the iron ions in the reagent A includes but is not limited to: 1:0.76, 1:0.8, 1:0.9, 1:0.9, 1:1, 1:1.1, 1:1.3, 1:1.4, 1:1.5, 1:1.51, 1:1.6, 1:1.8, 1:1.9, 1:2, 1:2.16, 1:2.3, 1:2.5, 1:2.6, 1:2.8, 1:3, 1:3.2, 1:3.5, 1:4, 1:4.2, 1:4.5, 1:5. Furthermore, the molar ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the iron ions in the reagent A is 1:(1.2-5) or 1:(1.4-5); further, the molar ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the iron ions in the reagent A is 1:(1.4-1.6) or 1:(1.8-2.5) or 1:(2.6-4) or 1:(4.2-5).

[0048] In one example, the iron ions are ferric ions.

[0049] In one example, the iron ion salt is one or more of FeCl3, FeCl3·6H2O, FeBr3, Fe2(SO4)3, Fe(CH3COO)3, and FeCl2. Further, the iron ion salt is one or more of FeCl3, FeCl3·6H2O, and FeBr3.

[0050] In one example, the mass concentration of hydrogen peroxide in the aqueous solution of hydrogen peroxide is 20% to 35%, further 25% to 30%. Specifically, the mass concentration of hydrogen peroxide in the aqueous solution of hydrogen peroxide includes but is not limited to: 20%, 23%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, and 35%.

[0051] In one example, the N,N-dimethylacetamide wastewater is N,N-dimethylacetamide wastewater generated during the synthesis of cefuroxime.

[0052] In one example, the mass fraction of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater is 0.5% to 5%. Specifically, the mass fraction of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater includes but is not limited to: 0.5%, 1%, 1.5%, 2%, 3%, 4%, and 5%.

[0053] The following are specific examples. Unless otherwise specified, the raw materials used in the examples are all commercially available products.

[0054] The activated carbon used in the examples is acidic powdered activated carbon with a specific surface area of ​​1000 m2 / g.

[0055] Example 1

[0056] Take 200g of N,N-dimethylacetamide (DMAC) wastewater produced during the synthesis of cefuroxime, where the mass fraction of DMAC is 1%. Take 2g of DMAc as 1eq.

[0057] The treatment steps of above-mentioned DMAC wastewater are as follows:

[0058] (1) Weigh 9.4 g of FeCl3·6H2O (1.51 eq), add 6 g of water to dissolve, then add 6.8 g of activated carbon and stir until it becomes a muddy mass that just absorbs the FeCl3·6H2O aqueous solution to prepare a solid catalyst;

[0059] (2) The solid catalyst of step (1) was first added to the DMAC wastewater, and then 42.1 g of a 28% (mass percentage) H2O2 aqueous solution (15.1 eq) was slowly added dropwise, wherein the reaction temperature was controlled at T = 50°C, the pH was controlled at 4 during the reaction, and the reaction time was 1 h.

[0060] Examples 2-1 to 2-6

[0061] Take 200g of N,N-dimethylacetamide (DMAC) wastewater produced during the synthesis of cefuroxime, where the mass fraction of DMAC is 1%. Take 2g of DMAc as 1eq.

[0062] The treatment steps of above-mentioned DMAC wastewater are as follows:

[0063] (1) Weigh iron salt, add 6 g of water to dissolve, then add 6.8 g of activated carbon and stir until it becomes a muddy paste that just absorbs the iron salt solution to prepare a solid catalyst;

[0064] (2) The solid catalyst of step (1) was first added to the DMAC wastewater, and then 42.1 g of a 28% (mass percentage) H2O2 aqueous solution (15.1 eq) was slowly added dropwise, wherein the reaction temperature was controlled at T = 30°C, the pH was controlled at 4 during the reaction, and the reaction time was 1 h.

[0065] In 2-1 to 2-5, the types of iron salts used in the above step (1) are different, namely 9.4gFeCl3·6H2O (1.51eq), 5.64gFeCl3 (1.51eq), 10.3gFeBr3 (1.51eq), 6.96gFe2(SO4)3 (0.755eq), and 6.5gFe(CH3COO)3 (1.51eq).

[0066] In 2-6, the iron salt used in the above step (1) is 6.5gFeCl2 (1.51eq), and the reaction temperature of the above step (2) is controlled to T=50°C, and other conditions remain unchanged.

[0067] Examples 3-1 to 3-7

[0068] Take 200g of N,N-dimethylacetamide (DMAC) wastewater produced during the synthesis of cefuroxime, where the mass fraction of DMAC is 1%. Take 2g of DMAc as 1eq.

[0069] The treatment steps of above-mentioned DMAC wastewater are as follows:

[0070] (1) Weigh 9.4 g of FeCl3·6H2O (1.51 eq), add 6 g of water to dissolve, then add 6.8 g of activated carbon and stir until it becomes a muddy mass that just absorbs the FeCl3·6H2O aqueous solution to prepare a solid catalyst;

[0071] (2) First, the solid catalyst of step (1) was added to the DMAC wastewater, and then a 28% (mass percentage) H2O2 aqueous solution was slowly added dropwise, wherein the reaction temperature was controlled to be T=30°C, the pH was controlled to be 4 during the reaction, and the reaction time was 1 h.

[0072] In Examples 3-1 to 3-7, the amount of 28% (mass percentage) H2O2 aqueous solution used in step (2) is different, namely 3.1g (1.1eq), 5.9g (2.1eq), 8.6g (3.1eq), 20.9g (7.55eq), 42.1g (15.1eq), 63.1g (22.65eq), and 84.2g (30.2eq).

[0073] Examples 4-1 to 4-6

[0074] Take 200g of N,N-dimethylacetamide (DMAC) wastewater produced during the synthesis of cefuroxime, where the mass fraction of DMAC is 1%. Take 2g of DMAc as 1eq.

[0075] The treatment steps of above-mentioned DMAC wastewater are as follows:

[0076] (1) Weigh FeCl3·6H2O, add 6g of water to dissolve it, then add 6.8g of activated carbon and stir until it becomes a muddy paste that just absorbs the FeCl3·6H2O aqueous solution to prepare a solid catalyst;

[0077] (2) The solid catalyst of step (1) was first added to the DMAC wastewater, and then 42.1 g of a 28% (mass percentage) H2O2 aqueous solution (15.1 eq) was slowly added dropwise, wherein the reaction temperature was controlled at T = 30°C, the pH was controlled at 4 during the reaction, and the reaction time was 1 h.

[0078] In Examples 4-1 to 4-6, the amount of FeCl3·6H2O used in step (1) is different, namely 0.76eq, 1eq, 1.51eq, 2.16eq, 3eq, and 5eq, respectively.

[0079] Examples 5-1 to 5-4

[0080] Take 200g of N,N-dimethylacetamide (DMAC) wastewater produced during the synthesis of cefuroxime, where the mass fraction of DMAC is 1%. Take 2g of DMAc as 1eq.

[0081] The treatment steps of above-mentioned DMAC wastewater are as follows:

[0082] (1) Weigh 9.4 g of FeCl3·6H2O (1.51 eq), add 6 g of water to dissolve, then add 6.8 g of activated carbon and stir until it becomes a muddy mass that just absorbs the FeCl3·6H2O aqueous solution to prepare a solid catalyst;

[0083] (2) The solid catalyst of step (1) was first added to the DMAC wastewater, and then 42.1 g of a 28% (mass percentage) H2O2 aqueous solution (15.1 eq) was slowly added dropwise, wherein the reaction temperature was controlled at T = 30°C, the pH was controlled during the reaction, and the reaction time was 1 h.

[0084] In Examples 5-1 to 5-4, the pH control during the reaction in step (2) was different, namely pH=4, pH=5, pH=6, and pH=7.

[0085] Examples 6-1 to 6-3

[0086] The DMAC wastewater and treatment steps of Examples 6-1 to 6-3 are the same as those of Example 1, with the main difference being that the reaction temperature control during the reaction in step (2) is different, and is replaced with T = 30°C, T = 40°C, and T = 60°C in sequence.

[0087] Examples 7-1 to 7-4

[0088] The DMAC wastewater and treatment steps of Examples 7-1 to 7-4 are the same as those of Example 1, with the main difference being that the amount of activated carbon in step (1) is different, being replaced with 4.8 g, 5.8 g, 7.8 g, and 8.8 g, respectively.

[0089] Comparative Example 1

[0090] Take 200g of N,N-dimethylacetamide (DMAC) wastewater produced during the synthesis of cefuroxime, where the mass fraction of DMAC is 1%. Take 2g of DMAc as 1eq.

[0091] The treatment steps of above-mentioned DMAC wastewater are as follows:

[0092] (1) Weigh 9.4 g of FeCl3·6H2O (1.51 eq) and dissolve it in 6 g of water to prepare an FeCl3·6H2O aqueous solution;

[0093] (2) The FeCl3·6H2O aqueous solution in step (1) was first slowly added dropwise to the DMAC wastewater, and then 42.1 g of a 28% (mass percentage) H2O2 aqueous solution (15.1 eq) was slowly added dropwise, wherein the reaction temperature was controlled at T = 30°C, the pH was controlled at 4 during the reaction, and the reaction time was 1 h.

[0094] The residual amount of DMAC in the treated DMAC wastewater of each Example and Comparative Example was calculated using the following formula: Residual Amount = COD Value of Treated Wastewater / COD Value of Untreated Wastewater. The COD value of the N,N-dimethylacetamide wastewater (with a DMAC mass fraction of 1%) in the Examples and Comparative Examples was 17759 (i.e., the COD value of the untreated wastewater).

[0095] The results are shown in Table 1 below:

[0096] Table 1

[0097]

[0098]

[0099]

[0100] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0101] The embodiments described above only express several implementation methods of the present application, which are convenient for understanding the technical solutions of the present application in a specific and detailed manner, but they cannot be understood as limiting the scope of protection of the patent application. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several variations and improvements can be made, which all fall within the scope of protection of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are all within the scope of protection of the claims attached to the present application. Therefore, the scope of protection of the patent application of this application shall be based on the content of the attached claims, and the description can be used to interpret the content of the claims.

Claims

1. A method for treating N,N-dimethylacetamide wastewater, characterized in that: The steps include: Reagent A and reagent B are provided; wherein, reagent A is activated carbon immobilized with iron ions; reagent B is an aqueous solution of hydrogen peroxide; and the iron ions are trivalent iron ions; Adding the reagent A and the reagent B sequentially into N,N-dimethylacetamide wastewater to react; The reaction temperature is 45°C to 65°C; the reaction pH is controlled to be 3.5 to 5.5; The mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the activated carbon in the reagent A is 1:(3.4-6).

2. The method for treating N,N-dimethylacetamide wastewater according to claim 1, wherein The reaction temperature is 50°C to 60°C.

3. The method for treating N,N-dimethylacetamide wastewater according to claim 1, wherein: The pH of the reaction is controlled to be 4-5.

4. The method for treating N,N-dimethylacetamide wastewater according to claim 1, wherein: The mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the activated carbon in the reagent A is 1:(3.4-4.4).

5. The method for treating N,N-dimethylacetamide wastewater according to claim 1, wherein: The mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the hydrogen peroxide in the reagent B is 1:(0.3-15).

6. The method for treating N,N-dimethylacetamide wastewater according to claim 5, characterized in that: The mass ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the hydrogen peroxide in the reagent B is 1:(5-15).

7. The method for treating N,N-dimethylacetamide wastewater according to claim 1, wherein: The molar ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the iron ions in the reagent A is 1:(0.76-5).

8. The method for treating N,N-dimethylacetamide wastewater according to claim 7, characterized in that: The molar ratio of N,N-dimethylacetamide in the N,N-dimethylacetamide wastewater to the iron ions in the reagent A is 1:(1.2-5).

9. The method for treating N,N-dimethylacetamide wastewater according to claim 1, wherein: The iron ion salt is one or more of FeCl3, FeCl3·6H2O, FeBr3, Fe2(SO4)3 and Fe(CH3COO)3.

10. The method for treating N,N-dimethylacetamide wastewater according to claim 9, characterized in that: The iron ion salt is one or more of FeCl3, FeCl3·6H2O and FeBr3.

11. The method for treating N,N-dimethylacetamide wastewater according to claim 1, characterized in that: The mass concentration of hydrogen peroxide in the aqueous solution of hydrogen peroxide is 20% to 35%.

12. The method for treating N,N-dimethylacetamide wastewater according to any one of claims 1 to 11, characterized in that: The N,N-dimethylacetamide wastewater is N,N-dimethylacetamide wastewater generated during the synthesis of cefuroxime.

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