CN114671482A - Method for synchronously removing heavy metal-organic matter combined pollution - Google Patents
Method for synchronously removing heavy metal-organic matter combined pollution Download PDFInfo
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Classifications
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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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
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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
- C02F2101/34—Organic compounds containing oxygen
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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
- C02F2101/38—Organic compounds containing nitrogen
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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
- C02F2103/003—Wastewater from hospitals, laboratories and the like, heavily contaminated by pathogenic microorganisms
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
Abstract
The invention belongs to the field of wastewater treatment, and discloses a method for synchronously removing heavy metal-organic matter combined pollution, which comprises the following steps: (1) preparing N-doped sludge biochar by a pyrolysis method; (2) adding N-doped sludge biochar and hydrogen peroxide solution into the wastewater containing heavy metals and organic matters, and stirring for reaction to synchronously remove the heavy metals and the organic matters in the wastewater. The invention discloses a mixingThe N sludge biochar and the wastewater treatment method are particularly suitable for treating wastewater polluted by heavy metals and organic matters in a combined way, and the heavy metal Cu in 2h2+The removal rate of the sulfadiazine can reach 64.8 percent, the removal rate of the sulfadiazine reaches 100 percent, and meanwhile, the biological toxicity level of the wastewater is obviously reduced.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a method for synchronously removing heavy metal-organic matter composite pollution and a method for wastewater treatment by using the same.
Background
With the rapid development and evolution of human civilization, the pollution degree of the ecological environment is increasingly serious, and the influence on water resources is particularly obvious. At present, heavy metals and antibiotics are the two most prominent contaminants in water. With the rapid development of industries such as metal plating, mining, feed, pesticide and the like, more and more heavy metal wastewater is discharged into a water body by a direct or indirect means, so that the problem of heavy metal pollution of the water body is increasingly serious; antibiotics are used as new pollutants in livestock raising and medical treatment, so that water bodies near farms and hospitals are easily subjected to composite pollution of heavy metals and antibiotics.
Both antibiotics and heavy metal pollutants have persistence and cause potential harm to human bodies and the environment for a long time. Heavy metals cannot be biologically decomposed, are easy to accumulate in organisms, and can enter human bodies through food chain enrichment; antibiotic contamination can induce resistance genes (ARGs) in microorganisms and can transfer to other species at the gene level, thereby posing a significant threat to human health. The combined toxicity caused by antibiotic and heavy metal combined pollution is obviously stronger than that caused by single pollution. The antibiotic contains a large amount of functional groups such as hydroxyl, carboxyl, amino and the like and electron donor atoms, can be complexed with heavy metals, and is converted into a composite pollutant with stronger toxicity and durability. The concentration level of heavy metals in the environment is in a certain relation with the appearance and increase of antibiotic resistance in organisms, and the increase of the abundance of ARGs in the environment is also closely related to the concentration of heavy metals. In addition, the toxicity mechanism of antibiotic and heavy metal combined pollution is different from the acute toxicity mechanism caused by single pollution of the antibiotic and the heavy metal. Therefore, the research on remediation of heavy metal and antibiotic combined pollution has become the key point of water body treatment.
At present, the research on the combined pollution of antibiotics and heavy metals is still incomplete, the mutual relation and the action mechanism between the two pollutants are not clear, and an effective technology aiming at the restoration of the combined pollution is lacked. The composite polluted wastewater is still treated by stages according to the conventional wastewater treatment method, but the treatment effect of a single remediation technology is not ideal due to great difference of the properties of pollutants, and the water body still contains composite pollutants with certain concentration. Therefore, there is a need to develop a related repair material or technology that can simultaneously remove the composite contamination with high efficiency.
The biochar has wide application in the aspects of heavy metal and antibiotic remediation, and has good potential of synchronously removing combined pollution. The preparation of the sludge biochar material (SBC) by pyrolysis with sludge as a substrate is one of the important ways of sludge resource treatment. Related researches on the sludge biochar show that the sludge biochar has a certain removing effect on heavy metals and antibiotics in a water body, and the original sludge biochar has a limited removing effect on the heavy metals and the antibiotics due to small specific surface area and small number of functional groups, so that the popularization and the application of the sludge biochar are seriously restricted. Research shows that the electronic arrangement, crystal structure, chemical reaction, pH value and electrical conductivity of the original biochar can be changed by doping N atoms into the biochar, the reaction activity of the biochar is obviously improved, and meanwhile, the original good physical and chemical properties of the biochar are kept.
The N-doped biochar has a good application prospect in the aspect of removing heavy metals and antibiotics in wastewater, but a method for synchronously removing heavy metal and organic matter combined pollution by using N-doped sludge biochar (NSBC) is unavailable at present.
Disclosure of Invention
In order to synchronously and efficiently remove the heavy metal and organic compound pollution in the wastewater, the invention provides a method for removing the heavy metal and organic pollutant in the wastewater, N-doped sludge biochar and trace hydrogen peroxide are added into the wastewater treatment process, NSBC can efficiently adsorb the heavy metal, and after the trace hydrogen peroxide is added, the heavy metal adsorbed on the surface of NSBC can catalyze the hydrogen peroxide to generate hydroxyl free radical (the·OH and singlet oxygen: (1O2) The invention utilizes the high adsorption performance of N-doped sludge biochar on heavy metals to remove heavy metals, heavy metals and hydrogen peroxide generated by catalysis in wastewater·OH and1O2can degrade organic pollutants, simultaneously accelerate the electron transfer speed on the surface of the N-doped sludge carbon in the catalysis process, and promote the N-doped sludge biochar to catalyze the hydrogen peroxide to generate a large amount of hydrogen peroxide·OH and1O2the organic pollutants are efficiently degraded, and the aim of synchronously removing the heavy metals and the organic pollutants is fulfilled.
The invention aims to provide a material for removing heavy metal and organic compound pollution in wastewater.
The invention also aims to provide a preparation method of the material for removing the composite pollution of the heavy metal and the organic matter in the wastewater.
Still another object of the present invention is to provide a method for wastewater treatment using the material for removing combined pollution of heavy metals and organic matters in wastewater.
In order to realize the purpose, the invention adopts the following technical scheme:
a method for synchronously removing heavy metal-organic matter composite pollution comprises the following steps:
(1) preparing N-doped sludge biochar by a pyrolysis method;
(2) adding N-doped sludge biochar and hydrogen peroxide solution into the wastewater containing heavy metals and organic matters, and stirring for reaction to synchronously remove the heavy metals and the organic matters in the wastewater.
Preferably, the sludge and the nitrogen-containing compound are mixed according to the mass ratio of 2: 1, mixing and stirring in a solvent, fully and uniformly mixing by ultrasound, drying the solvent by distillation, heating to 700 +/-100 ℃ in a protective atmosphere, and pyrolyzing for 2.5 +/-1.5 hours to prepare the N-doped sludge biochar. The material has good adsorption performance and catalytic performance, large specific surface area and total porosity, contains rich metal elements, and the doped nitrogen atoms change the charge arrangement of the N-doped sludge biochar and improve the catalytic capability of the N-doped sludge biochar and hydrogen peroxide.
Preferably, the nitrogen-containing compound is one or more of urea, melamine and ammonium chloride.
Preferably, the temperature rise rate is 5 ± 3 ℃/min.
Preferably, the concentration of the N-doped sludge biochar added in the step (2) is 0.8 +/-0.4 g/L, and the concentration of hydrogen peroxide is 20 +/-10 mM.
Preferably, the concentration of heavy metals in the wastewater is 10-200 mg/L, the organic pollutants comprise one or more of sulfonamide antibiotics, the concentration of the sulfonamide antibiotics is 3-40 mg/L, and the reaction time is 1-4 h.
Preferably, the concentration of heavy metals in the wastewater is 100 +/-50 mg/L, the organic pollutants comprise one or more of sulfanilamide antibiotics, the concentration of the sulfanilamide antibiotics is 20 +/-10 mg/L, and the reaction time is 2 +/-0.5 h.
Preferably, the organic contaminant is sulfadiazine.
Preferably, the pH range of the wastewater is 3-9.
Preferably, the heavy metal comprises one or more of copper, chromium, cobalt, manganese and iron.
In the wastewater treatment process, the mechanism of synchronously removing the heavy metal and organic compound pollution by the N-doped sludge biochar is that the N-doped sludge biochar firstly adsorbs the heavy metal to the surface through a plurality of mechanisms of ion exchange, complexation and surface precipitation and catalyzes H 2O2In the process, the electron transfer on the surface of the N-doped sludge biochar is accelerated, and the N-doped sludge biochar is promoted to catalyze H2O2Produce more·OH and1O2the organic pollutants are attracted to the surface of the N-doped sludge biochar under the electrostatic action and are preferentially attracted to the surface of the N-doped sludge biochar·OH and1O2oxidation and degradation, and reduction of the biological toxicity of the wastewater.
In particular, the removal of organic pollutants in wastewater is mainly N-doped sludge biochar catalyzed H2O2Produced by·OH and1O2the organic pollutants are mainly degraded on the surface of the N-doped sludge biochar. Heavy metal catalysis alone H2O2Produced by·The OH has limited degradation effect on organic pollutants; the N-doped sludge biochar alone cannot effectively catalyze H2O2And organic pollutants can not be effectively degraded.
The method for treating the wastewater comprises the step of removing heavy metals and organic pollutants in the wastewater.
Compared with the conventional method for treating the composite pollution of heavy metal and organic matter in a segmented manner, the method for synchronously removing the composite pollution by the N-doped sludge biochar is simpler in process, more environment-friendly, more thorough in degradation effect and remarkable in reduction of biotoxicity. The N-doped sludge biochar is used for adsorbing heavy metals, so that the heavy metals in the wastewater can be effectively removed, and the reaction of the adsorbed heavy metals and hydrogen peroxide can promote the N-doped sludge biochar to catalyze the hydrogen peroxide to generate active substances and efficiently degrade organic pollutants. The reaction time is only 2 hours, which is shorter than the time of the traditional treatment method.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention can be used for synchronously removing the heavy metal and organic pollutant combined pollution in the wastewater. The method of the invention adds the N-doped sludge biochar and a trace hydrogen peroxide solution into the wastewater to realize the synchronous removal of the composite pollution of the wastewater. In the wastewater treatment method, the N-doped sludge biochar can adsorb and remove heavy metals, and can promote the catalysis of the N-doped sludge biochar on hydrogen peroxide by utilizing the reaction of the adsorbed heavy metals and the hydrogen peroxide to generate active substances to efficiently degrade organic pollutants, so that the reaction time is shortened to 2 hours.
The wastewater treatment method is particularly suitable for treating aquaculture wastewater and medical wastewater, can efficiently remove heavy metals and organic pollutants in the wastewater, and remarkably reduces the biotoxicity level of the wastewater. Using the method for treating wastewater of the present invention, Cu in wastewater2+The removal rate can reach 64.8 percent, the removal rate of Sulfadiazine (SD) can reach 100 percent, and the biological toxicity can be reduced to 2.626mg/L mercuric chloride equivalent.
Drawings
FIG. 1 shows the combination of N-doped sludge biochar with Cu in example 22+Cu in sulfadiazine combined pollution 2+The removal effect map of (1).
FIG. 2 is a graph of the removal of sulfadiazine by various systems of example 2.
FIG. 3 shows the combination of N-doped sludge biochar with Cu in example 22+And a free radical quenching experimental result chart in the sulfadiazine combined pollution removal process; use of tert-butanol in quenching systems·OH; potassium iodide for quenching N-doped sludge biochar surface·OH; superoxide dismutase is used for quenching superoxide anion free radicals in a system; use of histidine in quenching systems1O2And a small part·OH。
FIG. 4 shows the combination of N-doped sludge biochar with Cu in example 32+The effect graph of removing heavy metal when various heavy metal ions coexist in sulfadiazine composite pollution; a is the coexistence of Cu and Cd; b is the coexistence of Cu and Cr; c is the coexistence of Cu and Pb; d is the coexistence of Cu and Zn; e is the coexistence of five heavy metals of Cu, Zn, Pb, Cd and Cr.
FIG. 5 shows the combination of N-doped sludge biochar with Cu in example 32+And the sulfadiazine has the effect of removing sulfadiazine when various heavy metal ions coexist in sulfadiazine composite pollution.
FIG. 6 shows the effect of the N-doped sludge charcoal on removing sulfadiazine in the system with different metals and sulfadiazine in example 3.
FIG. 7 shows the effect of the N-doped sludge biochar in example 3 on the removal of heavy metals in a coexistence system of different heavy metals and sulfadiazine.
Detailed Description
The invention will be further explained in detail with reference to the drawings and specific examples in the following description, which are not intended to limit the invention in any way. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Unless otherwise indicated, reagents and materials used in the following examples are commercially available.
Example 1 preparation of N-doped sludge biochar
1) Municipal sludge of a Dalmatian sand sewage treatment plant in Guangzhou city is dried in a drying oven at 100 ℃ to constant weight, so that the sludge is completely dehydrated.
2) The dried sludge is ground and sieved by a 200-mesh (the particle size of the sludge particles is about 75 mu m) wood sieve, and the sludge is collected by a cloth bag and then placed in a dryer for storage for subsequent pyrolysis.
3) Mixing urea and sludge according to the mass ratio of 1:2, adding the mixture into 300mL of ethanol (wherein the mass of the urea and the sludge is not less than 40g and not more than 120g), and performing ultrasonic treatment for 30min to fully and uniformly mix the urea and the sludge in the ethanol.
4) After the ultrasonic treatment is finished, stirring the mixture in a constant-temperature water bath kettle at 35 ℃ for 8 hours to completely volatilize the ethanol; collecting the mixture of residual urea and sludge into a bag, and placing the bag in a dryer for storage.
5) Placing the mixture of sludge and urea in a small ceramic disc, putting the small ceramic disc into a tubular furnace, and introducing N2As protective gas, the material is pyrolyzed for 2.5h at 700 ℃, and the heating rate is set to be 5 ℃ min-1。
6) And (3) washing the N-doped sludge biochar obtained by pyrolysis with deionized water for 3 times, and drying in an oven at 100 ℃ for 24 hours. Collecting the dried N-doped sludge biochar by using a cloth bag, and placing the biochar into a dryer for storage for later use.
Example 2 experiment for synchronously removing Cu and sulfadiazine composite pollution in wastewater by using N-doped sludge biochar
In order to explore the optimal removal performance of N-doped sludge biochar for removing heavy metal and sulfadiazine composite pollution in wastewater, Cu is selected as a target heavy metal, and the specific experimental conditions are designed as follows: taking 1g/L of Cu2+5mL of mother liquor, 16.7mL of 60mg/L SD mother liquor, 28.3mL of ultrapure water and H2O2100 μ L of the solution (commercial 30% strength) was added to a 100mL serum bottle to keep the Cu in solution2+The concentration is 100mg/L, the SD concentration is 20mg/L, H2O2The concentration is 20 mM; weighing 0.04g of N-doped sludge biochar, and adding the N-doped sludge biochar into a serum bottle to ensure that the concentration of NSBC in the system is 0.8 g/L; no buffer was added to adjust the pH.
Stirring the serum bottle on a magnetic stirrer at a constant speed for 2h, and sampling at 0min, 15 min, 30 min, 60 min, 90 min and 120min respectively. For determining the SD: and (3) stopping the degradation reaction of SD by taking 500 mu L of sample and 500 mu L of methanol, filtering the mixed solution by using a 0.22 mu m organic filter head, transferring the filtered mixed solution into a 1mL HPLC sample bottle, and storing the sample in a refrigerator at 4 ℃ to be detected. For measuring Cu 2+: taking 4mL of sample, centrifuging at 6000r/min for 4min, and passing through 0A22 μm aqueous filter head was transferred to a 5mL centrifuge tube, and 2 drops of a 2% nitric acid solution were added and measured by ICP-OES. The biological acute toxicity in the waste water is measured by GB/T15441-1995 luminescent bacteria method for measuring the acute toxicity of water.
As shown in figure 1, Cu in the combined pollution system after 2h2+The removal rate of the catalyst can reach 64.8 percent; as shown in fig. 2, the degradation rate of sulfadiazine in the 2h composite pollution system can reach 100%; as shown in Table 1, the acute toxicity of the wastewater after 10h reaction is reduced to 2.626mg/L mercuric chloride equivalent; as shown in figure 3, the degradation rate of sulfadiazine after adding tert-butyl alcohol and potassium iodide is less than 60%, which shows that the N-doped sludge biochar surface in the system·OH plays an important role in the degradation of sulfadiazine; superoxide dismutase does not influence the degradation of sulfadiazine, which shows that superoxide anion free radicals in the system do not participate in the degradation of sulfadiazine; the degradation of sulfadiazine is greatly inhibited after histidine is added, which indicates that the degradation of sulfadiazine in the system is greatly inhibited1O2Plays an important role in degrading sulfadiazine, namely the main mechanism of removing sulfadiazine by the N-doped sludge biochar is the surface of the N-doped sludge biochar ·The free radical pathway of OH and1O2non-free radical route (c).
TABLE 1 acute toxicity Change of N-doped sludge biochar on water quality after Cu and sulfadiazine composite polluted wastewater treatment
Example 3 experiment for synchronously removing heavy metals and sulfadiazine combined pollution in wastewater by doping N sludge biochar when multiple heavy metals coexist
In order to simulate the performance of N-doped sludge biochar in removing heavy metal and sulfadiazine composite pollution in wastewater under the coexistence of multiple heavy metals in actual wastewater, 5mL of Zn with the mother liquor concentration of 100mg/L is respectively added into the solution2+、Pb2+、Cd2+、Cr6 +Otherwise, the conditions were exactly the same as in example 2, so that the concentration of each metal in the solution was 100 mg/L. GetThe sample and the measurement method were the same as in example 2.
As shown in FIG. 4, when a plurality of metals coexist, Cu2+The removal effect of the copper is lower than that of Cu2+A separate system. Sludge biochar pair Pb doped with N2+And Cu2+All have good removal performance which respectively reaches 41 percent and 29 percent; n-doped sludge biochar pair Zn2+、Cd2+、Cr6+The three metal ions also have a certain removing effect; when various heavy metal ions coexist, the N-doped sludge biochar has the effect of removing all heavy metal ions, and the removal rates are Pb respectively2+32％，Cu2+19.5％，Cr6+11％，Zn2+8.3％，Cd2+5.1 percent. As shown in FIG. 5, the degradation rates of sulfadiazine in the experimental group in which Cu coexists with Zn, Pb and Cd are 83.7%, 82.9% and 84.5%, respectively; when Cu and Cr coexist, Cr 6+The catalyst has good catalytic capability on hydrogen peroxide, so that the degradation rate of sulfadiazine is still 100 percent; when Cu, Zn, Pb, Cd and Cr are compounded, Cr is contained6+Has better catalytic ability to hydrogen peroxide than other metals, and Cr6+The self-body has strong oxidability, so that the degradation rate of sulfadiazine in the group with coexisting composite metals can still reach 100 percent. Experimental data show that the N-doped sludge biochar has good removal performance on coexisting metal ions and has an excellent degradation effect on sulfadiazine.
The above embodiments are preferred embodiments of the present invention, and the present invention mainly illustrates the methods and the application ideas based on the methods, and the simple parameter substitutions in the embodiments cannot be described in detail in the embodiments, but do not limit the protection scope of the present invention, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be regarded as equivalent substitutions included in the protection scope of the present invention.
Claims (10)
1. A method for synchronously removing heavy metal-organic matter composite pollution is characterized by comprising the following steps:
(1) preparing N-doped sludge biochar by a pyrolysis method;
(2) Adding N-doped sludge biochar and hydrogen peroxide solution into the wastewater containing heavy metals and organic matters, and stirring for reaction to synchronously remove the heavy metals and the organic matters in the wastewater.
2. The method according to claim 1, characterized in that the sludge and the nitrogen-containing compound are mixed in a mass ratio of 2: 1, mixing and stirring in a solvent, fully and uniformly mixing by ultrasound, drying the solvent by distillation, heating to 700 +/-100 ℃ in a protective atmosphere, and pyrolyzing for 2.5 +/-1.5 hours to prepare the N-doped sludge biochar.
3. The method for preparing the material according to claim 2, wherein the nitrogen-containing compound is one or more of urea, melamine and ammonium chloride.
4. A method for preparing the material of claim 2, wherein the temperature increase rate is 5 ± 3 ℃/min.
5. The method according to claim 1 or 2 or 3 or 4, characterized in that the N-doped sludge biochar added in the step (2) has a concentration of 0.8 +/-0.4 g/L and a hydrogen peroxide concentration of 20 +/-10 mM.
6. The method according to claim 5, wherein the concentration of heavy metals in the wastewater is 10-200 mg/L, the organic pollutants comprise one or more of sulfanilamide antibiotics, the concentration of the sulfanilamide antibiotics is 3-40 mg/L, and the reaction time is 1-4 h.
7. The method according to claim 6, wherein the concentration of heavy metals in the wastewater is 100 + 50mg/L, the organic pollutants comprise one or more of sulfanilamide antibiotics, the concentration of sulfanilamide antibiotics is 20 + 10mg/L, and the reaction time is 2 + 0.5 h.
8. The method of claim 7, wherein the organic contaminant is sulfadiazine.
9. The method of claim 1 or 2 or 3 or 4, wherein the wastewater has a pH in the range of 3 to 9.
10. The method of claim 1 or 2 or 3 or 4, wherein the heavy metal comprises one or more of copper, zinc, lead, cadmium, nickel, chromium, cobalt, manganese, iron.
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| US20190099743A1 (en) * | 2017-10-04 | 2019-04-04 | Board Of Supervisors Of Louisiana State University And Agricultural And Mechanical College | Catalyst Composition Including a Biochar, and Related Methods |
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| CN115555006B (en) * | 2022-11-08 | 2023-08-15 | 广东省科学院生态环境与土壤研究所 | Preparation method and application of enteromorpha biological carbon catalyst |
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