CN115814760A - Preparation and application of sludge biochar - Google Patents
Preparation and application of sludge biochar Download PDFInfo
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- CN115814760A CN115814760A CN202310028022.8A CN202310028022A CN115814760A CN 115814760 A CN115814760 A CN 115814760A CN 202310028022 A CN202310028022 A CN 202310028022A CN 115814760 A CN115814760 A CN 115814760A
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- 239000010802 sludge Substances 0.000 title claims abstract description 130
- 238000002360 preparation method Methods 0.000 title claims description 17
- 238000003756 stirring Methods 0.000 claims abstract description 56
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 24
- 239000007864 aqueous solution Substances 0.000 claims abstract description 23
- 125000002091 cationic group Chemical group 0.000 claims abstract description 23
- UMPKMCDVBZFQOK-UHFFFAOYSA-N potassium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[K+].[Fe+3] UMPKMCDVBZFQOK-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000003750 conditioning effect Effects 0.000 claims description 33
- 230000001143 conditioned effect Effects 0.000 claims description 23
- 238000000197 pyrolysis Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 8
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- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 8
- 238000001179 sorption measurement Methods 0.000 abstract description 30
- 239000011148 porous material Substances 0.000 abstract description 11
- 239000002131 composite material Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 72
- 208000023445 Congenital pulmonary airway malformation Diseases 0.000 description 22
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- 125000003277 amino group Chemical group 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
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- 239000001257 hydrogen Substances 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
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Abstract
A process for preparing the biochar from sludge includes such steps as adding the aqueous solution of Cationic Polyacrylamide (CPAM) to sludge, stirring, adding potassium ferrate (K) 2 FeO 4 ) And carrying out secondary stirring treatment. After the sludge biochar prepared by the invention is treated by the composite conditioner, the specific surface area, the pore volume and the like of the prepared sludge biochar are improved, and CO is treated at a lower temperature 2 Has the advantages ofThe adsorption capacity can reach 114.72mg/g at 30 ℃, and the application of the sludge biochar in CO adsorption 2 Providing better orientation.
Description
Technical Field
The invention relates to the technical field of preparation of a biochar material, and particularly relates to preparation and application of sludge biochar.
Background
With the acceleration of urbanization in China, the discharge amount of sewage is increased, and the amount of sludge serving as a by-product of sewage treatment is also increased continuously. The daily treatment capacity of urban sewage in China reaches 19185 cubic meters by 2020, and the daily treatment capacity of dry sludge produced in China reaches 561 million tons. Due to the restriction of economic technology and other aspects, the mode of sludge treatment in China is single, and the existing sludge treatment main mode is that a large amount of sludge is incinerated and buried after dehydration. Since the industrial revolution, CO in air was generated by the combustion of fossil fuels such as coal and petroleum in large quantities 2 The content of CO is increasing continuously, as predicted by the International Committee for climate Change (IPCC) of the United nations 2 The concentration will reach 570ppm in 2100 years, the earth temperature rises by 1.9 ℃, and 2 ℃ should be the upper limit of tolerable climate warming.
Therefore, we must continuously improve the energy sourceThe structure, CCUS (Carbon Capture, inactivation and Storage), can contribute 14% of power in Carbon emission reduction, is considered as one of the most promising key technologies for Carbon emission reduction, and is highly regarded by countries in the world. Solid adsorbents are the hot spot of current research and are also technologies that are more likely to be commercially applied in the future. The carbon-based adsorbent is a common solid adsorbent, and has a porous structure, contains multiple functional groups and active point positions, and is beneficial to CO 2 And (4) adsorbing. If the municipal excess sludge is used for preparing the sludge biochar for CO 2 Trapping, not only solves the problem of difficult sludge treatment and disposal, but also is CO 2 Makes contribution to emission reduction and achieves the synergistic development of pollution reduction and carbon reduction.
In the prior art, cationic polyacrylamide is used as a conditioner to condition sludge, but the cracking temperature required for preparing sludge biochar reaches 800 ℃, and CO is adsorbed 2 The most excellent temperature is 90 ℃, which has great limitation on practical application.
Disclosure of Invention
The invention aims to provide a preparation method of sludge biochar.
The second purpose of the invention is to provide the application of the sludge biochar.
The purpose of the invention is realized by the following technical scheme:
a preparation method of sludge biochar is characterized by comprising the following steps: firstly conditioning the sludge, and then performing pyrolysis, wherein the conditioning is to add a Cationic Polyacrylamide (CPAM) aqueous solution into the sludge, stir the sludge, and then add potassium ferrate (K) 2 FeO 4 ) And carrying out secondary stirring treatment.
Further, after the secondary stirring treatment, the temperature of the sludge is raised to 50-60 ℃ and kept for 5-6min.
In the invention, CPAM conditioning is adopted firstly, and then K is adopted 2 FeO 4 Conditioning, so that each conditioner fully conditions the sludge, organic matters in the sludge are decomposed more completely, the specific surface area, pore volume and the like of the finally generated sludge biochar are larger, the pore diameter structure is regulated and controlled, and the biochar pair C is enhancedO 2 Molecular adsorption force.
In addition, the amino group may be reacted with CO 2 Condensation is carried out, oxygen-containing functional groups on the surface of the sludge biochar can be in a hydrogen bond form with CO 2 And (4) combining. The temperature is increased to promote the residual K in the sludge 2 FeO 4 Reacting with polyacrylamide and the conditioning decomposition product thereof, generating a small molecular structure by condensation, hydrogen bond formation and other modes, and increasing the content of structures such as oxygen-containing functional groups, amino groups and the like in the biochar.
Further, the CPAM aqueous solution is prepared by dissolving CPAM in deionized water to prepare a CPAM solution with a volume concentration of 0.1%.
Furthermore, the addition amount of the CPAM solution is 20-80mg/g sludge dry weight, K 2 FeO 4 The addition amount of (B) is 20-80mg/g sludge dry weight.
Further, the stirring is carried out for 30s at a rotating speed of 200-300r/min so as to be uniformly mixed, and then the stirring is carried out for 3min at a rotating speed of 25-35 r/min.
Further, the second stirring is performed at 1000r/min for 1min, and then at 150-200r/min for 4min.
Further, the pyrolysis is to add the conditioned sludge into N 2 Heating to 600-650 ℃ in the atmosphere, and preserving heat for 1h.
Most specifically, the preparation method of the sludge biochar is characterized by comprising the following steps:
step 1: conditioning treatment
Adding 0.1% cationic polyacrylamide aqueous solution into sludge, rapidly stirring at 200-300r/min for 30s to mix well, slowly stirring at 25-35r/min for 3min, and adding K 2 FeO 4 Stirring at 1000r/min for 1min, stirring at 150-200r/min for 4min, and heating to 50-60 deg.C for 5-6min; cationic polyacrylamide aqueous solution, K 2 FeO 4 The mass ratio of the sludge to the dry weight of the sludge is 20-30mg:60-80mg:1g of a compound;
step 2: pyrolysis treatment
Introducing 10min N into the sludge conditioned in the step 1 2 In N at 2 Keeping the temperature for 1h at 600-650 ℃ in the atmosphere.
The application of the sludge biochar is characterized in that: for adsorbing CO 2 。
A sludge biochar is characterized in that: the sludge biochar is obtained by conditioning sludge and then pyrolyzing the sludge, wherein the conditioning is to add a Cationic Polyacrylamide (CPAM) aqueous solution into the sludge, stir the solution and add potassium ferrate (K) 2 FeO 4 ) And carrying out secondary stirring treatment.
Further, after the secondary stirring treatment, the temperature of the sludge is raised to 50-60 ℃ and kept for 5-6min.
Further, the CPAM aqueous solution is prepared by dissolving CPAM in deionized water to prepare a CPAM solution with a volume concentration of 0.1%.
Further, the addition amount of the CPAM solution is 20-80mg/g sludge dry weight, K 2 FeO 4 The addition amount of (B) is 20-80mg/g sludge dry weight.
Further, the stirring is carried out for 30s at a rotating speed of 200-300r/min so as to be uniformly mixed, and then the stirring is carried out for 3min at a rotating speed of 25-35 r/min.
Further, the second stirring is performed at 1000r/min for 1min, and then at 150-200r/min for 4min.
Further, the pyrolysis is to add the conditioned sludge into N 2 Heating to 600-650 ℃ in the atmosphere, and preserving heat for 1h.
The invention has the following technical effects:
after the sludge biochar prepared by the invention is treated by the composite conditioner, the specific surface area, the pore volume and the like of the prepared sludge biochar are improved, and CO is treated at a lower temperature 2 Has excellent adsorption performance, and the adsorption capacity can reach 114.72mg/g at 30 ℃. Application of sludge biochar in CO adsorption 2 Providing better orientation.
Drawings
FIG. 1: scanning electron microscope images of the sludge biochar prepared by the invention.
FIG. 2: the sludge biochar prepared by the invention can react on CO at different temperatures 2 Graph of adsorption performance of (a).
FIG. 3: the element content of the sludge biochar prepared by each scheme is in proportion.
FIG. 4: the functional group spectrogram of the sludge biochar prepared by each scheme.
Detailed Description
The present invention is described in detail below by way of examples, it should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and those skilled in the art can make some insubstantial modifications and variations to the present invention based on the above disclosure.
Example 1
A preparation method of sludge biochar comprises the following steps:
step 1: conditioning treatment
Adding 0.1 volume percent of cationic polyacrylamide aqueous solution into the sludge, quickly stirring for 30s at the rotating speed of 250r/min to uniformly mix, slowly stirring for 3min at the rotating speed of 30r/min, and then adding K 2 FeO 4 Stirring at 1000r/min for 1min, stirring at 200r/min for 4min, and heating to 55 deg.C for 6min; cationic polyacrylamide aqueous solution, K 2 FeO 4 The mass ratio of the sludge to the dry weight of the sludge is 20mg:80mg:1g of a compound;
step 2: pyrolysis treatment
Introducing 10min N into the sludge conditioned in the step 1 2 In N at 2 Keeping the temperature for 1h at 600-650 ℃ in the atmosphere.
In order to compare the performance of the sludge biochar prepared by the invention, the invention is firstly conditioned by cationic polyacrylamide, and then K is added 2 FeO 4 The sludge biochar prepared by conditioning is marked as SB-CPAM-PF; no conditioner is added for conditioning treatment, and the sludge biochar is directly prepared and is marked as RSB; only adding Cationic Polyacrylamide (CPAM) for conditioning treatment to prepare sludge-removing biochar which is recorded as SB-CPAM; addition of K only 2 FeO 4 The charcoal was conditioned and the charcoal was designated SB-PF.
As shown in figure 1, the sludge biochar RSB, SB-CPAM, SB-PF and SB-CPAM-PF are sequentially arranged, and the surface topography structure of the biochar is shown in figure 1. From the figure, K can be observed 2 FeO 4 The roughness of the surface of the conditioned sludge biochar is reduced, and aggregates appear, which is probably due to K 2 FeO 4 The iron oxide generated after hydrolysis in water plays an aggregating role on the surface of the biochar. The surface roughness of the sludge biochar conditioned by adding CPAM is correspondingly reduced, and CPAM conditioning is firstly carried out, and then K conditioning is carried out 2 FeO 4 The sludge biochar prepared after conditioning has a small amount of filaments and a large amount of pore structures.
The biochar of each sludge is coupled with CO 2 Carrying out an adsorption test:
about 5mg of each of RSB, SB-CPAM, SB-PF and SB-CPAM-PF samples were tested at 120 ℃ for N 2 Degassing the biochar for 40min under the atmosphere, and then carrying out N 2 Naturally dropping to the specified temperature (30, 50, 70, 90, 110 ℃) under the atmosphere, and finishing the reaction on CO at the gas flow rate of 50ml/min 2 The adsorption time was 90min, and the results are shown in FIG. 2.
As a result: raw sludge biochar RSB is to CO at 30 DEG C 2 The adsorption performance is optimal, and the optimal adsorption quantity is 75.69mg/g; the sludge biochar SB-CPAM prepared after CPAM conditioning is added to CO at 90 DEG C 2 The best adsorption performance is achieved, the adsorption capacity is 80.81mg/g, and K is added 2 FeO 4 Conditioning sludge biochar SB-PF for CO at 50 DEG C 2 The adsorption performance is best, and the adsorption quantity is 81.68mg/g; while the SB-CPAM-PF prepared in example 1 was on CO at 30 deg.C 2 The adsorption capacity of (2) was the best, and the adsorption capacity was 114.72mg/g. It can be seen that CPAM and K are used respectively 2 FeO 4 The sludge biochar prepared by conditioning is used for treating CO at the temperature of 30 DEG C 2 Adsorption performance was not the best, but by first conditioning with CPAM and then K 2 FeO 4 The prepared sludge biochar is conditioned to CO at the temperature of 30 DEG C 2 An excellent adsorption effect is produced.
Comparative example 1
A preparation method of sludge biochar comprises the following steps:
step 1: conditioning treatment
Adding K into sludge 2 FeO 4 Stirring at 1000r/min for 1min, and then stirring at 200r/min for 4min; then adding a cationic polyacrylamide aqueous solution with the volume concentration of 0.1%, quickly stirring for 30s at the rotating speed of 250r/min to uniformly mix, slowly stirring for 3min at the rotating speed of 30r/min, and then raising the temperature of the sludge to 55 ℃ and keeping the temperature for 6min; cationic polyacrylamide aqueous solution, K 2 FeO 4 The mass ratio of the sludge to the dry weight of the sludge is 20mg:80mg:1g of a compound;
step 2: pyrolysis treatment
Introducing 10min N into the sludge conditioned in the step 1 2 In N at 2 Keeping the temperature for 1h at 600 ℃ in the atmosphere.
The sludge charcoal prepared in comparative example 1 was designated as SB-PF-CPAM. SB-PF-CPAM on CO at 50 deg.C 2 The adsorption capacity of (2) was the best, and the adsorption capacity was 94.81mg/g.
As can be seen from FIG. 3, K is added 2 FeO 4 Conditioning, namely increasing the content of C element on the surface of the prepared biochar SB-PF, and reducing the content of O and N; adding K first 2 FeO 4 Adding the C element content on the surface of the biological carbon SB-PF-CPAM prepared by CAMP conditioning to increase, reducing the O and N contents, adding CPAM and then K 2 FeO 4 The content of the element C on the surface of the prepared biochar SB-CPAM-PF is reduced, and the content of O and N is increased compared with that of SB-PF-CPAM. The carbon content can increase CO 2 London dispersion force with the organism, which contributes to CO 2 The excessive O content also helps the charcoal to adsorb CO 2 The N moiety and N-based functional group also play a role in creating Lewis basic sites and inducing electronic structural changes, enhancing acidic CO 2 And basic N, thereby improving the CO-p-reaction 2 And (4) adsorption performance.
Comparative example 2
A preparation method of sludge biochar comprises the following steps:
step 1: conditioning treatment
Adding a cationic polyacrylamide aqueous solution with the volume concentration of 0.1% into the sludge, quickly stirring for 30s at the rotating speed of 250r/min to uniformly mix, then slowly stirring for 3min at the rotating speed of 30r/min, then adding chitosan, quickly stirring for 1min at 1000r/min, and then stirring for 4min at 200 r/min; the mass ratio of the cationic polyacrylamide aqueous solution to the chitosan to the sludge is 20mg:1mg:1g;
step 2: pyrolysis treatment
Introducing N for 10min into the sludge treated in the step 1 2 In N at 2 Keeping the temperature for 1h at 600 ℃ under the atmosphere.
The sludge biochar prepared in comparative example 2 was designated as SB-CPAM-C. SB-CPAM-C on CO at 50 deg.C 2 The adsorption capacity of (2) was the best, and the adsorption capacity was 85.69mg/g.
As shown in FIG. 4, RSB has three peaks corresponding to 1350cm respectively according to the surface functional group pattern of biochar -1 Of (C is a-CH) 2 -，1600cm -1 Tensile vibration at N-H, 3400cm -1 Stretching of the O-H. The category of the biochar surface functional groups is not increased after the addition of the lytic agent and the flocculating agent, but the SB-PF-CPAM is at 3440cm -1 The peak value of (A) is increased, and the values of SB-CPAM-PF and SB-CPAM-C are at 1600cm -1 And 3440cm -1 The peak at (a) increases. The increased O-H peak of SB-CPAM-C is apparently due to the high amount of O-H contained in chitosan itself. This indicates that CPAM and C are successfully attached to the charcoal surface and that the basic nitrogen functionality helps to increase the acidic CO 2 Adsorption of (3).
Comparative example 3
A preparation method of sludge biochar comprises the following steps:
step 1: conditioning treatment
Adding K into sludge 2 FeO 4 Stirring at 1000r/min for 1min, and then stirring at 200r/min for 4min; then adding chitosan, rapidly stirring at 250r/min for 30s for mixing, slowly stirring at 30r/min for 3min 2 FeO 4 The mass ratio of the chitosan to the sludge is 80mg:1mg:1g of a compound;
step 2: pyrolysis treatment
Introducing 10min N into the sludge conditioned in the step 1 2 In N at 2 Keeping the temperature for 1h at 600 ℃ in the atmosphere.
The sludge biochar prepared in comparative example 3 was designated as SB-PF-C. SB-PF-C on CO at 30 deg.C 2 The adsorption performance is optimal, and the adsorption quantity is 86.56mg/g.
The physical properties of the surface of each sludge biochar are shown in table 1.
Table 1:
as can be seen from the above table, CPAM conditioning is first applied followed by K 2 FeO 4 After conditioning, the specific surface area, micropore area and pore volume of the prepared sludge biochar are increased, and the average pore diameter is reduced. If K is used first 2 FeO 4 The specific surface area, the micropore area and the pore volume of the sludge biochar prepared by conditioning are all reduced, and the pore diameter is in an increasing trend. However, it is known in the art that the closer the pore size is to the size of the adsorbed molecule, the stronger the adsorption force when only a single factor of pore size is considered.
The dehydration performance of the conditioned sludge is as follows:
100mL of raw sludge and K are measured by a measuring cylinder 2 FeO 4 Pouring the conditioned sludge, the conditioned sludge samples of example 1, comparative example 1 and comparative example 2 and comparative example 3 into a Buchner funnel, controlling the suction filtration pressure to be 0.030MPa, carrying out vacuum filtration dehydration, stopping filtration after 10min of suction filtration, placing the part intercepted on the filter paper into a weighing bottle with constant weight, weighing and recording. The weighing bottle is placed in an oven to be dried at 105 (+ -2) DEG C until the weight is constant. The calculation formula of the water content (FCM) of the filter cake is as formula (1):
in the formula: m-weight bottle mass, g;
m 1 -adding the mass of the filter cake before drying, g;
m 2 -adding the dried mud cake to a weighing bottle in mass g.
As a result: the water content of the mud cake after the raw sludge dehydration is 82.25 percent, and the single K 2 FeO 4 The water content of the conditioned mud cake is 77.65%, the water content of the conditioned mud cake in example 1 is 75.14%, the water content of the conditioned mud cake in comparative example 1 is 76.48%, the water content of the conditioned mud cake in comparative example 2 is 75.84%, and the water content of the conditioned mud cake in comparative example 3 is 74.70%.
Example 2
A preparation method of sludge biochar comprises the following steps:
step 1: conditioning treatment
Adding 0.1 volume percent of cationic polyacrylamide aqueous solution into the sludge, quickly stirring for 30s at the rotating speed of 250r/min to uniformly mix, slowly stirring for 3min at the rotating speed of 30r/min, and then adding K 2 FeO 4 Stirring at 1000r/min for 1min, and then stirring at 200r/min for 4min; cationic polyacrylamide aqueous solution, K 2 FeO 4 The mass ratio of the sludge to the dry weight of the sludge is 20-30mg:60-80mg:1g of a compound;
step 2: pyrolysis treatment
Introducing 10min N into the sludge conditioned in the step 1 2 In N at 2 Keeping the temperature for 1h at 600 ℃ under the atmosphere.
SB-CPAM-PF prepared in this example for CO 2 The amount of adsorption of (A) was 101.27mg/g.
Example 3
A preparation method of sludge biochar comprises the following steps:
step 1: conditioning treatment
Adding 0.1 volume percent of cationic polyacrylamide aqueous solution into the sludge, quickly stirring for 3s at the rotating speed of 250r/min to uniformly mix, slowly stirring for 3min at the rotating speed of 25r/min, and then adding K 2 FeO 4 Stirring at 1000r/min for 1min, stirring at 150r/min for 4min, and heating to 50 deg.C for 5min; cationic polyacrylamide aqueous solution, K 2 FeO 4 Mass ratio to dry weight of sludge30mg:60mg:1g of a compound;
step 2: pyrolysis treatment
Introducing N for 10min into the sludge treated in the step 1 2 In N at 2 The temperature is kept for 1h at 620 ℃ under the atmosphere.
SB-CPAM-PF prepared in this example for CO 2 The amount of adsorbed was 112.49mg/g.
Example 4
The preparation method of the sludge biochar is characterized by comprising the following steps of:
step 1: conditioning treatment
Adding 0.1 volume percent of cationic polyacrylamide aqueous solution into the sludge, quickly stirring for 30s at the rotating speed of 300r/min to uniformly mix, slowly stirring for 3min at the rotating speed of 35r/min, and then adding K 2 FeO 4 Stirring at 1000r/min for 1min, stirring at 180r/min for 4min, and heating to 60 deg.C for 5min; cationic polyacrylamide aqueous solution, K 2 FeO 4 The mass ratio of the sludge to the dry weight is 25mg:70mg:1g of a compound;
step 2: pyrolysis treatment
Introducing 10min N into the sludge conditioned in the step 1 2 In N at 2 Keeping the temperature for 1h at 650 ℃ in the atmosphere.
SB-CPAM-PF prepared in this example for CO 2 The adsorption amount of (A) was 111.58mg/g.
Claims (9)
1. A preparation method of sludge biochar is characterized by comprising the following steps: firstly conditioning the sludge, and then performing pyrolysis, wherein the conditioning is to add a Cationic Polyacrylamide (CPAM) aqueous solution into the sludge, stir the sludge, and then add potassium ferrate (K) 2 FeO 4 ) And carrying out secondary stirring treatment.
2. The method for preparing sludge biochar as claimed in claim 1, which is characterized in that: after the secondary stirring treatment, the temperature of the sludge is raised to 50-60 ℃ and kept for 5-6min.
3. The method for preparing sludge biochar as claimed in claim 1 or 2, wherein: the CPAM aqueous solution is prepared by dissolving CPAM in deionized water to prepare CPAM solution with volume concentration of 0.1%.
4. A method for preparing sludge biochar as claimed in any one of claims 1 to 3, wherein: the addition amount of the CPAM solution is 20-30mg/g sludge dry weight, K 2 FeO 4 The addition amount of (B) is 60-80mg/g dry weight of sludge.
5. The method for preparing sludge biochar as claimed in any one of claims 1 to 4, wherein: the stirring is carried out for 30s at a rotating speed of 200-300r/min to be uniformly mixed, and then the stirring is carried out for 3min at a rotating speed of 25-35 r/min.
6. The method for preparing sludge biochar as claimed in claim 5, wherein the method comprises the following steps: the secondary stirring is carried out at 1000r/min for 1min, and then at 150-200r/min for 4min.
7. The method for preparing sludge biochar as claimed in claim 6, wherein the method comprises the following steps: the pyrolysis is to add the conditioned sludge into N 2 Heating to 600-650 ℃ in the atmosphere, and preserving heat for 1h.
8. The preparation method of the sludge biochar is characterized by comprising the following steps:
step 1: conditioning treatment
Adding 0.1% cationic polyacrylamide aqueous solution into sludge, rapidly stirring at 200-300r/min for 30s to mix well, slowly stirring at 25-35r/min for 3min, and adding K 2 FeO 4 Stirring at 1000r/min for 1min, stirring at 150-200r/min for 4min, and heating to 50-60 deg.C for 5-6min; cationic polyacrylamide aqueous solution, K 2 FeO 4 The mass ratio of the sludge to the dry weight of the sludge is 20-30mg:60-80mg：1g；
Step 2: pyrolysis treatment
Introducing 10min N into the sludge conditioned in the step 1 2 In N at 2 Keeping the temperature for 1h at 600-650 ℃ in the atmosphere.
9. The use of the sludge biochar prepared by the preparation method of claim 8 is characterized in that: for adsorbing CO 2 。
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