CN114213173A - Method for preparing solid organic fertilizer from peanut residues and product - Google Patents
Method for preparing solid organic fertilizer from peanut residues and product Download PDFInfo
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- CN114213173A CN114213173A CN202111604737.0A CN202111604737A CN114213173A CN 114213173 A CN114213173 A CN 114213173A CN 202111604737 A CN202111604737 A CN 202111604737A CN 114213173 A CN114213173 A CN 114213173A
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- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D9/00—Other inorganic fertilisers
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- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
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- C05G5/12—Granules or flakes
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Abstract
The invention belongs to the technical field of agricultural fertilizers, and discloses a method for preparing a solid organic fertilizer by using peanut residues and a product. Adding water into peanut residue powder or a mixture of the peanut residue powder and cellulose/hemicellulose-containing agricultural and forestry waste powder, and stirring and mixing uniformly; stirring the obtained mixture for reaction under the atmosphere of inert gas; and adding an organic solvent into the obtained mixture, mixing, and performing suction filtration, washing, drying and granulation to obtain the solid organic fertilizer. The method can shorten the time for preparing the fertilizer from the peanut residues, the prepared solid organic fertilizer has high organic matter content and low heavy metal pollution risk, does not contain harmful bacteria, and can realize the value-added utilization of agricultural and forestry wastes represented by corncobs. The invention has great application potential in the aspects of recycling, value-added utilization and organic fertilizer preparation of agricultural and forestry wastes.
Description
Technical Field
The invention belongs to the technical field of agricultural fertilizers, and particularly relates to a method for preparing a solid organic fertilizer by utilizing peanut residues and a product.
Background
The bio-organic fertilizer is a soil-friendly fertilizer, and is widely popularized and used as a substitute of a chemical fertilizer. The biological organic fertilizer is prepared by taking livestock and poultry manure, municipal domestic waste, crop straws, agricultural and sideline products and organic wastes generated by food processing as raw materials and processing the raw materials through processes of composting, retting, fermenting and the like, and can obviously improve the nutrient utilization rate and the soil loosening degree and improve the physical and chemical properties of soil. The peanut residues are typical representatives of agricultural and sideline product wastes, contain rich nutritional ingredients and can be used for preparing solid organic fertilizers.
The research on the preparation of organic fertilizer by using peanut residues as raw materials disclosed at present is relatively extensive. The invention discloses a CN101012136A patent published in 8.8.2007 in China and introduces an organic fertilizer and a preparation method thereof, wherein the organic fertilizer is prepared by peanut residue, poultry manure and peat in a certain proportion and is fermented for 3-10 days at 25-30 ℃. The organic fertilizer has balanced nutrients and can improve the quality of crops. The invention discloses a CN106146059A patent published in 2016, 11, 23 and introduces an organic fertilizer, which is prepared by mixing raw materials such as peanut residue, chicken manure, plant ash and the like according to a certain proportion and fermenting for 12 days at normal temperature. The fertilizer has simple preparation method and low cost, and contains various nutrient substances required by plant growth. The invention discloses a CN108383660A invention published in 8, 8 and 10 months in 2018 in China, which introduces an agricultural planting multifunctional organic fertilizer, and the fertilizer is prepared by mixing raw materials such as peanut residue, cow dung, straws, trace elements and the like according to a certain proportion. The invention can better meet the elements required by the growth of crops, is suitable for most crops and improves the soil quality.
The technology has the following defects: the prepared fertilizer has balanced nutrients and can improve soil; but the raw material sources are complex, the fertilizer preparation period is long, and harmful bacteria are easy to breed and secondary pollution is caused in the fertilizer preparation process.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for preparing a solid organic fertilizer by utilizing the hydrothermal carbonization of peanut residues, which can obviously shorten the preparation period and avoid environmental pollution; the prepared solid organic fertilizer meets the standard NYT525-2021 of the Chinese agricultural organic fertilizer, and has high organic matter content, low heavy metal pollution risk and no harmful bacteria. Meanwhile, the value-added utilization of the agricultural and forestry wastes represented by the corncobs can be realized.
As an efficient and environment-friendly biomass treatment mode, the hydrothermal carbonization has the advantages of mild reaction conditions, low requirements on pretreatment of raw materials, almost no generation of harmful byproducts, and wide application in the aspects of preparing soil conditioners, adsorbents, biological organic fertilizers and the like. The preparation period can be shortened by carrying out hydrothermal carbonization treatment on the peanut residues, and the solid organic fertilizer which is rich in nutrients and high in organic matters is prepared.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for preparing a solid organic fertilizer by using peanut residues comprises the following steps:
(1) adding water into peanut residue powder or a mixture of the peanut residue powder and cellulose/hemicellulose-containing agricultural and forestry waste powder, and stirring and mixing uniformly;
(2) stirring the mixture obtained in the step (1) for reaction under the atmosphere of inert gas;
(3) and (3) adding an organic solvent into the mixture obtained in the step (2), mixing, and performing suction filtration, washing, drying, grinding and granulation to obtain the solid organic fertilizer.
Preferably, the particle size of the peanut residue powder in the step (1) is less than 0.30 mm; the grain diameter of the agriculture and forestry waste containing cellulose/hemicellulose is less than 0.30 mm.
Further preferably, the preparation of the peanut residue powder and the cellulose/hemicellulose-containing agricultural and forestry waste powder comprises the following steps: respectively grinding fresh peanut residues and cellulose/hemicellulose-containing agricultural and forestry waste into fine particles with the particle size of less than 0.30mm, and drying;
more preferably, the drying temperature is 105-115 ℃, and the drying time is 12-24 h;
preferably, in the step (1), the cellulose/hemicellulose-containing agricultural and forestry waste is corncobs; the cellulose/hemicellulose-containing agricultural and forestry waste can be subjected to Maillard reaction with peanut residues in the hydrothermal carbonization process, so that the fixation of nitrogen in a solid organic fertilizer is realized, and the value-added utilization of the agricultural and forestry waste can be realized.
Preferably, the water in step (1) is deionized water. The ratio of the volume of the water to the mass of the peanut residue powder or the mixture of the peanut residue powder and the cellulose/hemicellulose-containing agricultural and forestry waste powder is 6-15mL:1 g. More preferably, the ratio is 10mL to 1 g.
Preferably, in the step (1), the mixture of the peanut residue powder and the cellulose/hemicellulose-containing agricultural and forestry waste powder has a cellulose/hemicellulose-containing agricultural and forestry waste powder mass fraction of 0-95% and not 0.
Further preferably, the mixture of the peanut residue powder and the cellulose/hemicellulose-containing agricultural and forestry waste powder has a cellulose/hemicellulose-containing agricultural and forestry waste powder mass fraction of 25% -75%.
Preferably, the inert gas in the step (2) is at least one of nitrogen or helium; the pressure of the inert gas atmosphere is 0.2-0.5 MPa.
Preferably, in the step (2), the inert gas atmosphere is nitrogen, and the purity is 99.999%; the operation is as follows: and (3) introducing nitrogen with the pressure of 0.1MPa into the reaction kettle, opening an exhaust valve to exhaust air, closing the exhaust valve after 5min, increasing the air inlet pressure to 0.3MPa, and closing an air inlet valve after 1 min.
Preferably, in the step (2), the temperature of the stirring reaction is 180-260 ℃; the stirring reaction time is 30min-240 min; the speed of the stirring reaction is 300-800 rpm.
Further preferably, the temperature of the stirring reaction is 240-260 ℃; the stirring reaction time is 60min-120 min; the speed of the stirring reaction is 500-600 rpm.
Preferably, the organic solvent in step (3) is ethyl acetate or dichloromethane; the volume ratio of the organic solvent to the water in the step (1) is 1:1-1: 2.
Further preferably, the volume ratio of the organic solvent to the water in the step (1) is 1: 2.
Preferably, the temperature for drying in the step (3) is 105-115 ℃, and the time is 12-24 h.
Preferably, in the step (3), the separation instrument adopted by vacuum filtration is a sand core funnel, and the maximum value of the vacuum pressure is 0.1 MPa.
The solid organic fertilizer is prepared by the method for preparing the solid organic fertilizer by using the peanut residues.
The invention has the following advantages and beneficial effects:
(1) the method disclosed by the invention has the advantages that the required reaction device is simple, the reaction condition is mild, the reaction solvent is deionized water, the time for preparing the solid organic fertilizer from the peanut residues can be greatly shortened, and meanwhile, the environmental pollution is avoided; the prepared solid organic fertilizer meets the requirements of NYT525-2021, has high organic matter content and low heavy metal pollution risk, and does not contain harmful bacteria.
(2) According to the method, the peanut residues and the cellulose/hemicellulose-rich agricultural and forestry waste are mixed for hydrothermal carbonization by utilizing Maillard reaction, so that the nitrogen recovery rate in the solid fertilizer can be further improved, the ash content is reduced, and the adverse effect of excessive salt on plants and soil is avoided.
(3) The corncob selected by the method belongs to the agriculture and forestry waste rich in cellulose/hemicellulose, and can realize value-added utilization of cellulose, hemicellulose and other biomass resources.
Drawings
FIG. 1a is the elemental composition of ash from peanut residue feedstock in examples 1-6.
FIG. 1b shows the elemental composition of the ash of the corn cob feed in examples 1-6.
FIG. 2a is a surface microstructure of the peanut residue raw material of example 1.
Fig. 2b is a surface microstructure view of the solid organic fertilizer prepared by hydrothermal carbonization of peanut residues in example 1.
Fig. 3a is a surface microstructure diagram of the solid organic fertilizer in example 2.
Fig. 3b is a surface microstructure diagram of the solid organic fertilizer in example 3.
Detailed Description
The present invention is specifically described below with reference to examples, but the embodiments and the scope of the present invention are not limited to the following examples.
Example 1
The method for preparing the solid organic fertilizer by using the peanut residues comprises the following specific steps:
(1) grinding fresh peanut residue powder into fine particles with the particle size of less than 0.18mm, and drying in a drying oven at 105 ℃ for 12h to obtain the raw material.
(2) 10.00g of peanut residues are weighed into a 316L stainless steel reaction kettle with a capacity of 250 ml. 100ml of deionized water is poured into the reaction kettle, mechanical stirring is carried out for 5min, then nitrogen is introduced to remove air, and the initial pressure in the reaction kettle is maintained at 0.3 Mpa.
(3) The reaction temperature is set to 240 ℃, the magneton rotating speed is 500rpm, the temperature of the reaction kettle is raised to the set temperature at the heating rate of 2 ℃/min and then is maintained for 60 min. After the reaction is finished, when the reaction kettle is naturally cooled to 100 ℃, tap water is introduced into a cooling coil of the reaction kettle to accelerate the cooling to room temperature, and then an exhaust valve is opened to exhaust gas in the reaction kettle.
(4) Adding 50mL of ethyl acetate into the reaction kettle, mixing, filtering, washing and separating out a solid product. And drying the solid product in a drying oven at 110 ℃ for 12h, and then grinding into particles to obtain the solid organic fertilizer.
Example 2
The method for preparing the solid organic fertilizer by using the peanut residues comprises the following specific steps:
(1) grinding fresh peanut residue and corncob powder into fine particles with the particle size of less than 0.25mm, and drying in a drying oven at 105 ℃ for 16h to obtain the raw materials.
(2) 5.00g of peanut residues were weighed into a 316L stainless steel reaction kettle having a capacity of 250ml, and 5.00g of corncobs were added. 100ml of deionized water is poured into the reaction kettle, mechanical stirring is carried out for 5min, then nitrogen is introduced to remove air, and the initial pressure in the reaction kettle is maintained at 0.2 Mpa.
(3) The reaction temperature is set to 240 ℃, the magneton rotating speed is 700rpm, the temperature of the reaction kettle is raised to the set temperature at the heating rate of 2 ℃/min and then is maintained for 60 min. After the reaction is finished, when the reaction kettle is naturally cooled to 100 ℃, tap water is introduced into a cooling coil of the reaction kettle to accelerate the cooling to room temperature, and then an exhaust valve is opened to exhaust gas in the reaction kettle.
(4) Adding 70mL of ethyl acetate into the reaction kettle, mixing, filtering, washing and separating out a solid product. And (3) drying the solid product in a drying oven at 105 ℃ for 24h, and then grinding into particles to obtain the solid organic fertilizer.
Example 3
The method for preparing the solid organic fertilizer by using the peanut residues comprises the following specific steps:
(1) grinding fresh peanut residue and corncob powder into fine particles with the particle size of less than 0.30mm, and drying in a drying oven at 105 ℃ for 24h to obtain the raw materials.
(2) 5.00g of peanut residues were weighed into a 316L stainless steel reaction kettle having a capacity of 250ml, and 5.00g of corncobs were added. 100ml of deionized water is poured into the reaction kettle, mechanical stirring is carried out for 5min, then nitrogen is introduced to remove air, and the initial pressure in the reaction kettle is maintained at 0.4 Mpa.
(3) The reaction temperature is set to be 260 ℃, the rotating speed of magnetons is 600rpm, the temperature of the reaction kettle is raised to the set temperature at the heating rate of 2 ℃/min and then is maintained for 60min, and the reaction is finished. After the reaction is finished, when the reaction kettle is naturally cooled to 100 ℃, tap water is introduced into a cooling coil of the reaction kettle to accelerate the cooling to room temperature, and then an exhaust valve is opened to exhaust gas in the reaction kettle.
(4) Adding 80mL of ethyl acetate into the reaction kettle, mixing, and filtering, washing and separating out a solid product. And drying the solid product in a drying oven at 115 ℃ for 16h, and then grinding into particles to obtain the solid organic fertilizer.
Example 4
The method for preparing the solid organic fertilizer by using the peanut residues comprises the following specific steps:
(1) grinding fresh peanut residue and corncob powder into fine particles with the particle size of less than 0.25mm, and drying in a drying oven at 105 ℃ for 16h to obtain the raw materials.
(2) 5.00g of peanut residues were weighed into a 316L stainless steel reaction kettle having a capacity of 250ml, and 5.00g of corncobs were added. 100ml of deionized water is poured into the reaction kettle, mechanical stirring is carried out for 5min, then nitrogen is introduced to remove air, and the initial pressure in the reaction kettle is maintained at 0.2 Mpa.
(3) The reaction temperature is set to 240 ℃, the magneton rotating speed is 700rpm, the temperature of the reaction kettle is raised to the set temperature at the heating rate of 2 ℃/min and then is maintained for 120min, and the reaction is finished. After the reaction is finished, when the reaction kettle is naturally cooled to 100 ℃, tap water is introduced into a cooling coil of the reaction kettle to accelerate the cooling to room temperature, and then an exhaust valve is opened to exhaust gas in the reaction kettle.
(4) Adding 70mL of ethyl acetate into the reaction kettle, mixing, filtering, washing and separating out a solid product. And (3) drying the solid product in a drying oven at 105 ℃ for 24h, and then grinding into particles to obtain the solid organic fertilizer.
Example 5
The method for preparing the solid organic fertilizer by using the peanut residues comprises the following specific steps:
(1) grinding fresh peanut residue and corncob powder into fine particles with the particle size of less than 0.25mm, and drying in a drying oven at 105 ℃ for 16h to obtain the raw materials.
(2) 7.50g of peanut residues are weighed into a 316L stainless steel reaction kettle with a capacity of 250ml, while 2.50g of corncobs are added. 100ml of deionized water is poured into the reaction kettle, mechanical stirring is carried out for 5min, then nitrogen is introduced to remove air, and the initial pressure in the reaction kettle is maintained at 0.2 Mpa.
(3) The reaction temperature is set to 240 ℃, the magneton rotating speed is 700rpm, the temperature of the reaction kettle is raised to the set temperature at the heating rate of 2 ℃/min and then is maintained for 120min, and the reaction is finished. After the reaction is finished, when the reaction kettle is naturally cooled to 100 ℃, tap water is introduced into a cooling coil of the reaction kettle to accelerate the cooling to room temperature, and then an exhaust valve is opened to exhaust gas in the reaction kettle.
(4) Adding 70mL of ethyl acetate into the reaction kettle, mixing, filtering, washing and separating out a solid product. And (3) drying the solid product in a drying oven at 105 ℃ for 24h, and then grinding into particles to obtain the solid organic fertilizer.
Example 6
The method for preparing the solid organic fertilizer by using the peanut residues comprises the following specific steps:
(1) grinding fresh peanut residue and corncob powder into fine particles with the particle size of less than 0.25mm, and drying in a drying oven at 105 ℃ for 16h to obtain the raw materials.
(2) 2.50g of peanut residues are weighed into a 316L stainless steel reaction kettle with a capacity of 250ml, while 7.50g of corncobs are added. 100ml of deionized water is poured into the reaction kettle, mechanical stirring is carried out for 5min, then nitrogen is introduced to remove air, and the initial pressure in the reaction kettle is maintained at 0.2 Mpa.
(3) The reaction temperature is set to 240 ℃, the magneton rotating speed is 700rpm, the temperature of the reaction kettle is raised to the set temperature at the heating rate of 2 ℃/min and then is maintained for 120min, and the reaction is finished. After the reaction is finished, when the reaction kettle is naturally cooled to 100 ℃, tap water is introduced into a cooling coil of the reaction kettle to accelerate the cooling to room temperature, and then an exhaust valve is opened to exhaust gas in the reaction kettle.
(4) Adding 70mL of ethyl acetate into the reaction kettle, mixing, filtering, washing and separating out a solid product. And (3) drying the solid product in a drying oven at 105 ℃ for 24h, and then grinding into particles to obtain the solid organic fertilizer.
The basic properties of the peanut residues and the corn cob feedstock used in examples 1-6 are shown in Table 1, and the ash of corn cobs and peanut residues is prepared at 550 ℃ by reference to the standard ASTM D2974-14, in which the metallic elements of the feedstock are deposited.
FIGS. 1a and 1b show the elemental composition of ash in peanut residue and corn cob feedstocks as detected by Energy Dispersive Spectroscopy (EDS). As shown in the figure 1a and the figure 1b, the raw materials of the corncobs and the peanut residues do not contain heavy metal elements such As As, Hg, Pb, Cd and Cr mentioned in the NYT525-2021 of the Chinese agricultural organic fertilizer standard. Therefore, the solid organic fertilizer prepared by the method provided by the invention has no risk of heavy metal pollution.
The solid organic fertilizer prepared in the embodiments 1 to 6 is prepared by hydrothermal carbonization at 240 ℃ to 260 ℃ to obtain a solid product, and drying at 105 ℃ for 12 to 24 hours to obtain the solid organic fertilizer. The moisture content of the solid organic fertilizer is less than 30% which is lower than the moisture content required by the Chinese agricultural organic fertilizer standard NYT525-2021, and the solid organic fertilizer does not contain ascarid eggs and faecal coliform bacteria, and can meet the requirements of the Chinese agricultural organic fertilizer standard NYT 525-2021.
The pH values of the solid organic fertilizer prepared in the embodiments 1-6 are measured to be between 5.5 and 8.5 according to the test method in the Chinese agricultural organic fertilizer standard NYT525-2021, and the requirements of the NYT525-2021 are met.
The basic properties of the peanut residue raw materials and the prepared solid organic fertilizer in examples 1-6 are shown in Table 1. As can be seen from Table 1, the peanut residue material contains total nutrients (N + P)2O5+K2O) reached 13.065%, but the C/N ratio was 4.78 and the ash content was 6.675%. Too small C/N ratio can cause damage to plant growth, and peanut residues are not suitable for being directly used as organic fertilizers.
In the embodiment 1, after the peanut residues are subjected to hydrothermal carbonization, the total nutrient of the solid product meets the requirement that the total nutrient is more than 4.0% in the NYT525-2021 standard of Chinese agricultural organic fertilizer, the organic matter meets the standard that the organic matter is more than 30%, the other indexes meet the requirements in the standard, the C/N ratio is improved to 9.51, the decomposition degree is moderate, and the solid product has the potential of being used as a solid organic fertilizer. However, the yield of solid product was only 16.08%, the N recovery was 11.33%, and the ash content was 11.519% as determined by reference to the standard ASTM D2974-14. In examples 2-3, after 50% of corncobs are added, the solid product still has the potential of being used as an organic fertilizer by referring to the Chinese agricultural organic fertilizer standard NYT525-2021, and the quality of the prepared solid organic fertilizer is higher than that of the solid organic fertilizer in example 1. In example 2, the C/N ratio of the solid organic fertilizer was increased to 12.64, which is close to the C/N ratio of microbial cells in soil, the solid yield was increased to 28.13%, the ash content was reduced to 0.895%, and the N recovery rate was increased to 30.84%. In example 4, after 50% by mass of corncobs are added, the reaction time is prolonged to 120min, the solid product can meet the requirements of the Chinese agricultural organic fertilizer standard NYT525-2021, the total nutrient content is 6.331%, and the N recovery rate reaches 34.90%.
The method provided by the invention can shorten the time for preparing the fertilizer from the peanut residues, can avoid environmental pollution, and the prepared solid organic fertilizer has high organic matter content, low heavy metal pollution risk and no harmful bacteria, and can realize value-added utilization of agricultural and forestry wastes represented by corncobs.
TABLE 1
Note: the above test results were all measured in the oven-dried state.
The surface microstructures of the peanut residue raw material used in examples 1-3 and the solid organic fertilizer product obtained by the preparation are shown in fig. 2a, fig. 2b, fig. 3a and fig. 3 b. In example 1, the peanut residues are subjected to hydrothermal carbonization, and then the surface is smooth, and the polymerized structure is destroyed, so that a porous surface structure containing spherical particles is formed. The surface microstructures of the solid organic fertilizers prepared in the examples 2 and 3 show more spherical particles and porous structures. The method provided by the invention can enable the prepared solid organic fertilizer to have a more loose porous structure, thereby having better performances of loosening soil and absorbing nutrients.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A method for preparing a solid organic fertilizer by using peanut residues is characterized by comprising the following steps:
(1) adding water into peanut residue powder or a mixture of the peanut residue powder and cellulose/hemicellulose-containing agricultural and forestry waste powder, and stirring and mixing uniformly;
(2) stirring the mixture obtained in the step (1) for reaction under the atmosphere of inert gas;
(3) and (3) adding an organic solvent into the mixture obtained in the step (2), mixing, and performing suction filtration, washing, drying and granulation to obtain the solid organic fertilizer.
2. The method for preparing the solid organic fertilizer by using the peanut residues as claimed in claim 1, wherein the particle size of the peanut residue powder in the step (1) is less than 0.30 mm; the grain diameter of the agriculture and forestry waste containing cellulose/hemicellulose is less than 0.30 mm.
3. The method for preparing the solid organic fertilizer by utilizing the peanut residues as claimed in claim 1, wherein in the step (1), the cellulose/hemicellulose-containing agricultural and forestry waste is corncobs; the water is deionized water; the ratio of the volume of the water to the mass of the peanut residue powder or the mixture of the peanut residue powder and the cellulose/hemicellulose-containing agricultural and forestry waste powder is 6-15mL:1 g.
4. The method for preparing the solid organic fertilizer by using the peanut residues as claimed in claim 1, wherein in the step (1), the mass fraction of the cellulose/hemicellulose-containing agricultural and forestry waste powder in the mixture of the peanut residue powder and the cellulose/hemicellulose-containing agricultural and forestry waste powder is 0-95% and is not 0.
5. The method for preparing the solid organic fertilizer by using the peanut residues as claimed in claim 4, wherein the mass fraction of the cellulose/hemicellulose-containing agricultural and forestry waste powder in the mixture of the peanut residue powder and the cellulose/hemicellulose-containing agricultural and forestry waste powder is 25-75%.
6. The method for preparing the solid organic fertilizer by using the peanut residues as claimed in claim 1, wherein the inert gas in the step (2) is at least one of nitrogen or helium; the pressure of the inert gas atmosphere is 0.2-0.5 MPa.
7. The method for preparing the solid organic fertilizer by using the peanut residues as claimed in claim 1, wherein in the step (2), the temperature of the stirring reaction is 180-260 ℃; the stirring reaction time is 30min-240 min; the speed of the stirring reaction is 300-800 rpm.
8. The method for preparing the solid organic fertilizer by using the peanut residues as claimed in claim 7, wherein the temperature of the stirring reaction is 240-260 ℃; the stirring reaction time is 60min-120 min; the speed of the stirring reaction is 500-600 rpm.
9. The method for preparing the solid organic fertilizer by using the peanut residues as claimed in claim 1, wherein the organic solvent in the step (3) is ethyl acetate or dichloromethane; the volume ratio of the organic solvent to the water in the step (1) is 1:1-1: 2; the drying temperature in the step (3) is 105-115 ℃, and the time is 12-24 h.
10. The solid organic fertilizer prepared by the method for preparing the solid organic fertilizer by using the peanut residues as claimed in any one of claims 1 to 9.
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| US10434551B1 (en) * | 2018-12-10 | 2019-10-08 | China University Of Petroleum (East China) | Method for improving saline-alkaline soil by using biomass rapid pyrolysis product |
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