CN113318724B - Preparation method of cow dung biogas residue carbon and application of cow dung biogas residue carbon in persulfate activation system - Google Patents
Preparation method of cow dung biogas residue carbon and application of cow dung biogas residue carbon in persulfate activation system Download PDFInfo
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- CN113318724B CN113318724B CN202110460672.0A CN202110460672A CN113318724B CN 113318724 B CN113318724 B CN 113318724B CN 202110460672 A CN202110460672 A CN 202110460672A CN 113318724 B CN113318724 B CN 113318724B
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- 210000003608 fece Anatomy 0.000 title claims abstract description 67
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 58
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 title claims abstract description 29
- 230000004913 activation Effects 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000002351 wastewater Substances 0.000 claims abstract description 32
- 238000003763 carbonization Methods 0.000 claims abstract description 15
- 229940123317 Sulfonamide antibiotic Drugs 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
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- 238000000034 method Methods 0.000 claims description 7
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- 238000004090 dissolution Methods 0.000 abstract 1
- JLDCNMJPBBKAHH-UHFFFAOYSA-N sodium;(4-aminophenyl)sulfonyl-pyrimidin-2-ylazanide Chemical compound [Na+].C1=CC(N)=CC=C1S(=O)(=O)[N-]C1=NC=CC=N1 JLDCNMJPBBKAHH-UHFFFAOYSA-N 0.000 description 19
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- OVBPIULPVIDEAO-LBPRGKRZSA-N folic acid Chemical compound C=1N=C2NC(N)=NC(=O)C2=NC=1CNC1=CC=C(C(=O)N[C@@H](CCC(O)=O)C(O)=O)C=C1 OVBPIULPVIDEAO-LBPRGKRZSA-N 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
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- 150000003456 sulfonamides Chemical class 0.000 description 4
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- 229910020343 SiS2 Inorganic materials 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 2
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- 229910052681 coesite Inorganic materials 0.000 description 2
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- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 206010007269 Carcinogenicity Diseases 0.000 description 1
- 206010059866 Drug resistance Diseases 0.000 description 1
- 241000192125 Firmicutes Species 0.000 description 1
- 229910003481 amorphous carbon Inorganic materials 0.000 description 1
- 239000003674 animal food additive Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010871 livestock manure Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 125000005385 peroxodisulfate group Chemical group 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 229960002135 sulfadimidine Drugs 0.000 description 1
- ASWVTGNCAZCNNR-UHFFFAOYSA-N sulfamethazine Chemical compound CC1=CC(C)=NC(NS(=O)(=O)C=2C=CC(N)=CC=2)=N1 ASWVTGNCAZCNNR-UHFFFAOYSA-N 0.000 description 1
- JNMRHUJNCSQMMB-UHFFFAOYSA-N sulfathiazole Chemical compound C1=CC(N)=CC=C1S(=O)(=O)NC1=NC=CS1 JNMRHUJNCSQMMB-UHFFFAOYSA-N 0.000 description 1
- 229960001544 sulfathiazole Drugs 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000000273 veterinary drug Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
- B01J27/04—Sulfides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/40—Organic compounds containing sulfur
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
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Abstract
The invention provides a preparation method of cow dung biogas residue carbon and application thereof in a persulfate activation system; the preparation method comprises the following steps: pyrolyzing cow dung biogas residue at the low temperature of 400-450 ℃, adding water, uniformly mixing, performing microwave carbonization for 25-45min, and finally performing suction filtration and drying to obtain the cow dung biogas residue; the application comprises the following steps: putting the cow dung biogas residue carbon and persulfate into the culture wastewater containing the sulfonamide antibiotics, stirring at normal temperature for reaction, and activating the persulfate by using the cow dung biogas residue carbon to degrade the sulfonamide antibiotics in the culture wastewater. The preparation method of the cow dung biogas residue carbon provided by the invention has the advantages that the selected raw materials are wide in source and simple, the prepared cow dung biogas residue carbon is high in activity, low in cost and free of metal dissolution; by adopting the cow dung biogas residue carbon activated persulfate to treat the sulfonamide antibiotics in the culture wastewater, the degradation efficiency is high, the operation and management are convenient, and the reduction treatment and resource utilization of biogas residue can be realized while the culture wastewater is subjected to advanced treatment.
Description
Technical Field
The invention relates to the technical field of catalytic treatment of organic wastewater, and particularly relates to a preparation method of cow dung biogas residue carbon and application of the cow dung biogas residue carbon in a persulfate activation system.
Background
Nowadays, China has become one of the largest countries in livestock and poultry breeding scale in the world. In the process of livestock breeding, the antibiotics for livestock are not only used as disease treatment drugs, but also widely used as feed additives for promoting growth and preventing diseases, and the sulfonamides are typical veterinary drugs; the medicine can interfere the synthesis of bacterial folic acid to prevent the bacterial folic acid from growing and propagating, can inhibit most gram-positive bacteria and partial gram-negative bacteria, enhance the drug resistance of the bacteria, and even has certain carcinogenicity. After biological treatment of many antibiotic waste water, biochemical indexes and the like in the antibiotic waste water can basically reach the standard, but a certain amount of antibiotic and products thereof which are difficult to degrade still remain in the antibiotic waste water, thereby bringing potential threat to water ecological safety.
On the other hand, with the gradual expansion of the livestock and poultry breeding scale in China, a large amount of excrement discharged in the breeding process becomes one of the problems which must be solved in the development of the breeding industry; the biogas engineering is an effective treatment mode for livestock and poultry manure in China at present. The biogas residues are used as one of residues of biogas fermentation, and the fertilizer is the most main digestion mode of the biogas residues at the present stage in China; however, the fertilizer has potential risks of promoting secondary salinization of soil and the like, and due to continuous and concentrated generation of biogas residues, especially with the construction of large and medium-sized biogas projects, a large amount of biogas residues far exceed the consumption level of peripheral farmlands/lands. In the operation of certain large-scale biogas projects, the disposal of biogas residues becomes a bottleneck problem which restricts the normal operation of the biogas projects.
In the treatment technology aiming at the organic pollutants difficult to degrade, the persulfate activation technology is widely applied. Because the persulfate has stable property at normal temperature and normal pressure, a certain mode is usually required to be adopted for activating the persulfate; among them, the applications include transition metal activation and non-metal carbon activation, and the transition metal is often dissolved out due to metal, so that the potential risk of secondary pollution is caused.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a preparation method of cow dung biogas residue carbon and application thereof in a persulfate activation system.
The invention adopts the following technical scheme:
a preparation method of cow dung biogas residue carbon comprises the following steps:
pyrolyzing the cow dung biogas residue at the low temperature of 400-450 ℃, adding water, uniformly mixing, performing microwave carbonization for 25-45min, and finally performing suction filtration and drying to obtain the cow dung biogas residue.
In the above technical solution, the frequency and power of the microwave carbonization are 2.2-2.6GHz and 450-500W, respectively.
Further, in the above technical scheme, the temperature of the microwave carbonization is 135-160 ℃.
In a preferred embodiment of the invention, the preparation method of the cow dung biogas residue carbon specifically comprises the following steps:
s1, naturally drying fresh cow dung biogas residues in a cow farm, crushing, and sieving with a 10-mesh sieve;
s2, filling the screen underflow in the step S1 into a 30mL crucible, placing the crucible into a muffle furnace, heating to 100 ℃ at the speed of 5 ℃/min, then preserving heat for 1h, heating to 450 ℃ at the speed of 10 ℃/min, preserving heat for 2h, naturally cooling, and taking out;
s3, mixing the pyrolysis product in the step S2 and water according to the weight ratio of 1g: uniformly mixing 5mL of the mixture, placing the mixture in a microwave instrument, adjusting the frequency, power and temperature of the microwave instrument to be 2.45GHz, 500W and 150 ℃, and performing microwave carbonization for 30 min;
s4, performing suction filtration on the product after microwave carbonization treatment, drying at 80-100 ℃, grinding, and sieving with a 100-mesh sieve to obtain the cow dung biogas residue carbon.
The invention also provides the cow dung biogas residue carbon prepared by the preparation method.
Specifically, the surface of the cow dung biogas residue carbon has a rich cellular porous structure, and specifically shows various shapes such as micron-sized spheres, blocks and irregular shapes.
The invention also provides an application of the cow dung biogas residue carbon in a persulfate activation system, which specifically comprises the following steps:
putting the cow dung biogas residue carbon and persulfate into the culture wastewater containing the sulfonamide antibiotics, stirring at normal temperature for reaction, and using the cow dung biogas residue carbon to activate the persulfate so as to degrade the sulfonamide antibiotics in the culture wastewater.
In the technical scheme, the addition amount of the cow dung biogas residue carbon is controlled to be 1.0-1.2g/L in mass concentration of the cow dung biogas residue carbon in the culture wastewater.
In the technical scheme, the addition amount of the persulfate is controlled to be 10-15mM of the molar concentration of the persulfate in the culture wastewater.
Further, in the technical scheme, the pH value of the aquaculture wastewater is 3.0-9.0.
Compared with the prior art, the invention has the beneficial effects that:
(1) the raw material selected by the preparation method of the cow dung biogas residue carbon provided by the invention is the cow dung biogas residue which is a by-product of the biogas fermentation of a farm, the bottleneck problem of restricting the normal operation of large-scale biogas engineering is solved, a new approach is provided for the reduction treatment and resource utilization of the biogas residue, the selected preparation process is low-temperature pyrolysis and microwave rapid carbonization, the defects of high pyrolysis temperature, long carbonization time and the like can be avoided, no modification treatment is needed, the preparation method is simple, the prepared cow dung biogas residue carbon has high activity and low cost, and no metal is dissolved out;
(2) the persulfate activation system constructed by the cow dung biogas residue carbon provided by the invention does not need to adjust the pH value of wastewater when treating sulfonamide antibiotic wastewater, has the advantages of good treatment effect, low system energy consumption, simple process and simple and convenient operation, and the selected cow dung biogas residue carbon for activating persulfate has low cost, is environment-friendly and has good practical application prospect.
Drawings
FIG. 1 is a scanning electron micrograph of cow dung biogas residue carbon prepared according to an embodiment of the present invention;
FIG. 2 is a second scanning electron micrograph of cow dung biogas residue carbon prepared according to the embodiment of the present invention;
FIG. 3 is an XRD spectrum of carbon from cow dung biogas residue prepared by the embodiment of the present invention;
FIG. 4 is an X-ray fluorescence spectrum of the cow dung biogas residue carbon prepared by the embodiment of the invention.
Detailed Description
The present invention is further described in detail below with reference to specific examples so that those skilled in the art can more clearly understand the present invention. The following examples are provided only for illustrating the present invention and are not intended to limit the scope of the present invention. All other embodiments obtained by a person skilled in the art based on the specific embodiments of the present invention without any inventive step are within the scope of the present invention.
In the examples of the present invention, all the raw material components are commercially available products well known to those skilled in the art, unless otherwise specified; in the examples of the present invention, unless otherwise specified, all technical means used are conventional means well known to those skilled in the art.
In the examples of the present invention, the raw materials used were all conventional commercially available products.
Example 1
The embodiment of the invention provides a preparation method of cow dung biogas residue carbon, which specifically comprises the following steps:
s1, naturally drying fresh cow dung biogas residues in a cow farm, crushing, and sieving with a 10-mesh sieve;
s2, taking undersize materials to fill a crucible of 30mL, putting the crucible into a muffle furnace, heating to 100 ℃ at the speed of 5 ℃/min, then preserving heat for 1h, heating to 450 ℃ at the speed of 10 ℃/min, preserving heat for 2h, naturally cooling, and taking out;
s3, mixing the pyrolysis product in the crucible with water according to the weight ratio of 1g: uniformly mixing 5mL of the mixture, placing the mixture in a microwave instrument, adjusting the frequency, power and temperature of the microwave instrument to be 2.45GHz, 500W and 150 ℃, and performing microwave carbonization treatment for 30 min;
s4, performing suction filtration on the product after microwave carbonization treatment, drying at 80-100 ℃, grinding, and sieving with a 100-mesh sieve to obtain the cow dung biogas residue carbon.
FIG. 1-2 is a scanning electron micrograph of cow dung biogas residue carbon prepared according to the embodiment of the present invention; as can be seen from the figure, the cow dung biogas residue carbon presents various shapes such as micron-sized spheres, blocks, irregular shapes and the like, and the surface of the cow dung biogas residue carbon has a rich cellular porous structure.
FIG. 3 is an XRD spectrum of carbon from cow dung biogas residue prepared by the embodiment of the present invention; as can be seen from the figure, the prepared cow dung biogas residue carbon sample and SiO2(#46-1045) and SiS2(47-1376) the standard PDF card has very high matching degree, in addition, the broad peak of 2 theta between 20-30 degrees corresponds to the diffraction peak of amorphous carbon, which shows that the prepared cow dung biogas residue carbon sample is SiO2And SiS2Multicomponent biochar is a predominant crystalline phase.
Fig. 4 is an X-ray fluorescence spectrum of the cow dung biogas residue carbon prepared by the embodiment of the present invention, and the following table 1 shows the detection result of the X-ray fluorescence spectrometer (corresponding to fig. 4).
TABLE 1X-ray fluorescence spectrometer test results
As can be seen from the results of fig. 4 and table 1, the prepared cow dung biogas residue carbon sample contains various components, and after oxygen is removed, the content of Si is highest (49.60 Wt%), the content of carbon is second (21.02%), and the sum of the contents of Si and carbon is more than 70% of the total weight, which indicates that Si and C are main constituent elements of cow dung biogas residue carbon, and in addition, cow dung biogas residue carbon also contains various other trace components, such as K, Ca, Mg, S, Al, Fe, Ti, Mn, and the like.
Application example 1 treatment effect of different systems on sulfadiazine sodium in aquaculture wastewater
Experimental methods
Initial concentration of sulfadiazine sodium (in C)oExpressed as the same below) was 10mg/L, the amount of peroxodisulfate (expressed as PDS, the same below) was 10mM, the amount of cow dung biogas residue charcoal (expressed as BRC, the same below) was 1.0g/L, the natural pH of the wastewater (7.5. + -. 0.1) was 25. + -. 1 ℃.
Results of the experiment
The results of the specific experiments are shown in table 2 below.
TABLE 2 treatment Effect of different systems on sulfadiazine sodium
The results in the table 2 are analyzed, so that the single BRC system has a weak adsorption effect on sulfadiazine sodium, and the removal rate of sulfadiazine sodium after 2 hours of treatment is only 5.1%; the adsorption effect of a single PDS system on sulfadiazine sodium is also common, and the removal rate of the sulfadiazine sodium after 2 hours of treatment is 46.9%; and the removal rate of the BRC/PDS system is as high as 95.5%, which shows that the constructed persulfate activation system has a very good treatment effect on sulfadiazine sodium.
Application example 2BRC/PDS System to degradation effects of various sulfonamides antibiotics
Experimental methods
The initial concentration of the sulfonamide antibiotics is 10mg/L, [ PDS ] ═ 10mM, [ BRC ] ═ 1.0g/L, the wastewater natural pH, the reaction temperature is 25. + -. 1 ℃.
Results of the experiment
The results of the specific experiments are shown in table 3 below.
TABLE 3 degradation Effect of BRC/PDS System on various sulfonamides
The results in the table 3 are analyzed, and the BRC/PDS system has more than 94% of degradation rate on the sulfathiazole, the sulfamethazine and the sulfadiazine sodium, which shows that the constructed persulfate activation system has good degradation effect on various sulfonamides antibiotics.
Application example 3 influence of BRC dosing amount on treatment of sulfadiazine sodium in aquaculture wastewater by persulfate activation system
Experimental methods
C0＝10mg/L，[PDS]The wastewater had a natural pH of 10mM and the reaction temperature was 25. + -. 1 ℃.
Results of the experiment
The results of the specific experiments are shown in table 4 below.
TABLE 4 Effect of BRC dosing on sulfadiazine sodium degradation Effect
The results in the table 4 are analyzed, so that the residual rate of sulfadiazine sodium in the wastewater is gradually reduced along with the continuous increase of the BRC adding amount, and the degradation effect is obviously improved; when the BRC adding amount is increased from 0.8g/L to 1.0g/L and 1.2g/L, after 2 hours of reaction, the degradation rate is respectively increased from 79.2% to 95.5% and 96.0%, which shows that the using amount of the activating agent is in the range of 1.0-1.2g/L, and the persulfate activating system has very obvious degradation effect on the sulfadiazine sodium wastewater.
Application example 4 influence of PDS dosage on treatment of sulfadiazine sodium in aquaculture wastewater by persulfate activation system
Experimental methods
C0＝10mg/L，[BRC]1.0g/L, the wastewater natural pH, reaction temperature 25 + -1 deg.C.
Results of the experiment
The results of the specific experiments are shown in table 5 below.
The results in Table 5 show that the degradation rate of the system to sulfadiazine sodium is kept above 92% and the degradation effect is good when the dosage of PDS is within the range of 10-15 mM.
TABLE 5 Effect of PDS dosage on the degradation Effect of sulfadiazine sodium
Application example 5 initial pH value (pH) of wastewater0) Influence on degradation effect of sulfadiazine sodium
Experimental methods
C0＝10mg/L，[PDS]＝10mM，[BRC]The reaction temperature was 25 ± 1 ℃ at 1.0 g/L.
Results of the experiment
The results of the specific experiments are shown in table 6 below.
TABLE 6 pH0Influence on degradation effect of sulfadiazine sodium in aquaculture wastewater
The results in Table 6 show that the initial pH value of the wastewater is within the range of 3.0-9.0, the degradation rate of the system to sulfadiazine sodium is kept above 91%, and the degradation effect is good.
It should be noted that the above examples are only for further illustration and description of the technical solution of the present invention, and are not intended to further limit the technical solution of the present invention, and the method of the present invention is only a preferred embodiment, and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A preparation method of cow dung biogas residue carbon, which is characterized in that,
the method comprises the following steps: pyrolyzing cow dung biogas residue at the temperature of 400-450 ℃, adding water, uniformly mixing, performing microwave carbonization for 25-45min, and finally performing suction filtration and drying to obtain the cow dung biogas residue;
the frequency and the power of the microwave carbonization are respectively 2.2-2.6GHz and 450-500W;
the temperature of the microwave carbonization is 135-160 ℃.
2. The method for preparing cow dung biogas residue carbon according to claim 1, wherein,
the method specifically comprises the following steps:
s1, naturally drying fresh cow dung biogas residues in a cow farm, crushing, and sieving with a 10-mesh sieve;
s2, filling the screen underflow in the step S1 into a 30mL crucible, placing the crucible into a muffle furnace, heating to 100 ℃ at the speed of 5 ℃/min, then preserving heat for 1h, heating to 450 ℃ at the speed of 10 ℃/min, preserving heat for 2h, naturally cooling, and taking out;
s3, uniformly mixing the pyrolysis product obtained in the step S2 and water according to the proportion of 1g to 5mL, placing the mixture in a microwave instrument, adjusting the frequency, power and temperature of the microwave instrument to be 2.45GHz, 500W and 150 ℃, and performing microwave carbonization for 30 min;
s4, performing suction filtration on the product after microwave carbonization treatment, drying at 80-100 ℃, grinding, and sieving with a 100-mesh sieve to obtain the cow dung biogas residue carbon.
3. A cow dung biogas residue carbon prepared by the preparation method of claim 1 or 2.
4. The use of the cow dung biogas residue carbon in a persulfate activation system according to claim 3, wherein,
putting the cow dung biogas residue carbon and persulfate into the culture wastewater containing the sulfonamide antibiotics, stirring at normal temperature for reaction, and using the cow dung biogas residue carbon to activate the persulfate so as to degrade the sulfonamide antibiotics in the culture wastewater.
5. The use of cow dung biogas residue carbon in a persulfate activation system according to claim 4, wherein,
the adding amount of the cow dung biogas residue carbon is controlled to be 1.0-1.2g/L in mass concentration of the cow dung biogas residue carbon in the culture wastewater.
6. The use of cow dung biogas residue carbon in a persulfate activation system according to claim 4, wherein,
the addition amount of the persulfate is to control the molar concentration of the persulfate in the culture wastewater to be 10-15 mM.
7. The use of cow dung biogas residue carbon according to any one of claims 4-6, characterized in that,
the pH value of the aquaculture wastewater is 3.0-9.0.
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