CN111517870A - Preparation method of organic fertilizer - Google Patents
Preparation method of organic fertilizer Download PDFInfo
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- CN111517870A CN111517870A CN202010606568.3A CN202010606568A CN111517870A CN 111517870 A CN111517870 A CN 111517870A CN 202010606568 A CN202010606568 A CN 202010606568A CN 111517870 A CN111517870 A CN 111517870A
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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
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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- C—CHEMISTRY; METALLURGY
- 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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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
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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
- 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
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
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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
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
Abstract
The invention provides a preparation method of an organic fertilizer, which comprises the following steps: processing the straws into straw particles, and putting the straw particles into a stirrer for stirring; adding the biogas residues into the stirrer to be stirred to form a mixture A; adding industrial brown sugar into the mixture A to adjust the carbon-nitrogen ratio, adding furfural wastewater to adjust the pH value, and continuously stirring to form a mixture B; adding activated carbon, zeolite and bentonite into the mixture B, and continuously stirring to form a mixture C; and composting, drying, granulating, crushing and screening the mixture C to prepare the organic fertilizer. According to the invention, the straw and the biogas residues are used as composting raw materials, and the activated carbon and the industrial brown sugar are added, so that the maturity of a compost mixture can be effectively promoted, odorous gas generated in the composting process is reduced, heavy metal elements such as Cu, Pb, Zn and the like in soil are degraded to a certain degree, and the promotion effect of the prepared organic fertilizer on the growth of crops is improved.
Description
Technical Field
The invention relates to the technical field of organic fertilizer preparation, in particular to a preparation method of an organic fertilizer.
Background
So far, the yield of the straws is about 9 hundred million tons every year in China, the yield of the straws is large, and the production places are relatively centralized. However, the current straw high-value utilization technology is not complete, so that the average utilization rate of the total straws is at a lower level.
The processing to the straw in traditional agriculture is mostly returning to the field and directly burning for nutrient composition in the straw can't be by make full use of, and have about 20% straw burnt and direct abandonment each year, and the nutrient substance in the straw can't by make full use of, and economic benefits can not by full play, and can cause certain pollution to the environment.
The estimated current annual biogas waste (including biogas residues and biogas slurry) yield of China is about 4 hundred million tons. For a long time, due to the problems of low nutrient content of the biogas manure, backward returning equipment and the like, the main treatment mode of the biogas manure and the biogas residues in China still uses the biogas manure and the biogas residues as agricultural fertilizers to return to the field for utilization after simple processing, so that the total utilization rate of the biogas manure in China is low.
In the prior art, although the straw is used for biogas residue compost as a high-value utilization effect, the biogas residue and the straw are used as substrates to carry out composting by matching with other agricultural wastes, so that the high-value utilization of the biogas residue and the straw is realized. However, the existing organic fertilizer preparation method has low utilization rate of nutrient substances, nitrogen is lost to a certain extent, substances such as heavy metals in the organic fertilizer are not removed, and the fertilizing effect of the organic fertilizer is poor.
Disclosure of Invention
The invention solves the problems that: the existing organic fertilizer preparation method has low utilization rate of nutrient substances, certain loss of nitrogen, no removal of substances such as heavy metals in the organic fertilizer and the like, and poor fertilization effect of the organic fertilizer.
In order to solve the problems, the invention provides a preparation method of an organic fertilizer, which comprises the following steps:
step S1, processing the straws into straw particles, and placing the straw particles into a stirrer for stirring;
step S2, adding the biogas residues into the stirrer to be stirred to form a mixture A;
step S3, adding industrial brown sugar into the mixture A to adjust the carbon-nitrogen ratio, adding furfural wastewater to adjust the pH value, and continuing stirring to form a mixture B;
step S4, adding activated carbon, zeolite and bentonite into the mixture B, and continuously stirring to form a mixture C;
and step S5, composting, drying, granulating, crushing and screening the mixture C to prepare the organic fertilizer.
Optionally, in the step S1, the straw is processed into a long strip with a length of 2cm to 3cm, and the long strip of straw particles are placed into the stirrer to be stirred for 7min to 8 min.
Optionally, the method for preparing organic fertilizer according to claim 1, wherein in the step S2, the mass ratio of the biogas residues to the straw particles put into the stirrer is 7: 1 to 9: 1, in the range of.
Optionally, in the step S3, adding the industrial brown sugar to the mixture B in a carbon-nitrogen ratio of 25: 1 to 30: 1, in the range of.
Optionally, supplementary water is further added in the step S3 until the water content in the mixture B reaches 65% to 70%.
Optionally, in the step S4, the total mass of the activated carbon, the zeolite and the bentonite added accounts for 5% to 7% of the total mass of the mixture C.
Optionally, the mass ratio of the activated carbon to the zeolite is in the range of 2: 1 to 4.5: 1, the mass ratio of the activated carbon to the bentonite is 1: 1 to 2.5: 1, in the range of.
Optionally, in step S5, an extrusion molding process is used for granulation.
Optionally, in the step S5, the composting the mixture C includes:
stacking the mixture C in a strip-shaped manner, wherein the stacking height is in a range of 1.3-1.5 m, turning the mixture C at intervals of 3-5 days, and the stacking time is in a range of 50-60 days.
Optionally, the drying is performed in a vacuum drying oven in a decompression manner until the moisture content of the material is in a range of 15% to 20%.
Compared with the prior art, the preparation method of the organic fertilizer provided by the invention has the following advantages:
(1) the invention takes the straws and the biogas residues as composting raw materials, and adds the activated carbon and the industrial brown sugar, so that the maturity of a compost mixture can be effectively promoted, the odor gas generated in the composting process can be reduced, heavy metal elements such as Cu, Pb, Zn and the like in soil can be degraded to a certain degree, and a certain promotion effect on the growth vigor of crops can be realized in the final application process of the fertilizer.
(2) According to the invention, the activated carbon is added, so that the decomposition degree of a compost mixture can be effectively promoted, and compared with a fertilizer without the activated carbon, the composting time can be greatly reduced. Meanwhile, the addition of the activated carbon can play a certain role in nitrogen preservation on compost mixtures, remove a large amount of odorous gas in organic fertilizers and absorb NH3And H2S and other odorous gases, and can generate passivation effect on heavy metals such as Cr, Pb and Cd in soil, and reduce the content of heavy metal elements in the organic fertilizer.
(3) Compared with other sugars, the industrial brown sugar added in the fertilizer preparation process can serve as nutrient substances for supplementing carbon sources and microorganisms, and the industrial brown sugar also contains part of mineral elements such as iron, calcium, potassium and the like, so that the nutrient content of the fertilizer can be increased, and the iron and the calcium are all trace elements necessary for plant growth, so that the growth of plants can be effectively promoted by adding the industrial brown sugar.
(4) According to the invention, by regulating and controlling initial composting parameters such as initial carbon-nitrogen ratio and water content of compost and the addition proportion of activated carbon in the composting process, the problems of low composting efficiency, insufficient substrate utilization, low decomposition degree, odor gas and greenhouse gas generated in the composting process and the like in the prior art are solved, and the nutrition of the composted finished fertilizer is more comprehensive. And due to the addition of the activated carbon, the water holding rate of the organic fertilizer can be improved, the nutrient utilization rate of the organic fertilizer is increased, the release amount of heavy metals in the organic fertilizer is reduced, the organic fertilizer in a finished fertilizer product has good adsorbability, adsorbable pollutants and partial heavy metals in soil can be adsorbed and degraded, the environmental pollution is effectively reduced, the heavy metal content is reduced, and the soil fertility is improved.
Drawings
Fig. 1 is a schematic flow diagram of a preparation method of the organic fertilizer.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In addition, the terms "comprising," "including," "containing," and "having" are intended to be non-limiting, i.e., that other steps and other ingredients can be added that do not affect the results. "within a range" includes the endpoints.
In addition, although the invention has described the forms of S1, S2, S3 and the like for each step in the preparation, the description is only for the convenience of understanding, and the forms of S1, S2, S3 and the like do not represent the limitation of the sequence of each step.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
With reference to fig. 1, the invention provides a preparation method of an organic fertilizer, comprising the following steps:
step S1, processing the straws into straw particles, and placing the straw particles into a stirrer for stirring;
step S2, adding the biogas residues into the stirrer to be stirred to form a mixture A;
step S3, adding industrial brown sugar into the mixture A to adjust the carbon-nitrogen ratio, adding furfural wastewater to adjust the pH value, and continuing stirring to form a mixture B;
step S4, adding activated carbon, zeolite and bentonite into the mixture B, and continuously stirring to form a mixture C;
and step S5, composting, drying, granulating and screening the mixture C to prepare the organic fertilizer.
The invention provides an organic fertilizer preparation method by combining the efficacy of active carbon in the composting process, aiming at the problems of low utilization rate of biogas residues and straws, low utilization rate of nutrient substances of an organic fertilizer prepared in the composting process of straws and biogas residues, certain loss of nitrogen, no removal of substances such as heavy metals in the organic fertilizer, poor fertilization effect of the organic fertilizer and the like: the straw and the biogas residues are used as composting raw materials, and the activated carbon and the industrial brown sugar are added, so that the decomposition degree of a compost mixture can be effectively promoted, odorous gas generated in the composting process is reduced, heavy metal elements such as Cu, Pb, Zn and the like in soil are degraded to a certain degree, and a certain promotion effect on the growth vigor of crops is realized in the final application process of the fertilizer.
In step S1, the straw is cut into strips of 2cm to 3cm, and the strips of straw particles are placed in a stirrer and stirred for 7min to 8min, so that the straw particles are sufficiently smashed, and the straw can absorb biogas slurry nutrients, and can be conveniently molded and fixed.
Specifically, in step S2, the mass ratio of the straw particles to the straw particles in the stirrer is 7: 1 to 9: 1, stirring the biogas residues in a stirrer, and fully stirring and uniformly mixing the biogas residues and the straw particles. Preferably, the mass ratio of the biogas residues to the straw particles is 8: 1, stirring and mixing for 5-6 min.
Specifically, in step S3, industrial brown sugar is added to mixture a until the carbon-nitrogen ratio in mixture B is 25: 1 to 30: 1, preferably 28: compared with other sugars, the industrial brown sugar is added in the fertilizer preparation process, can serve as nutrient substances for supplementing carbon sources and microorganisms, and also contains part of mineral elements such as iron, calcium and potassium, so that the nutrient content of the fertilizer can be increased, and the iron and the calcium are all trace elements necessary for plant growth, so that the growth of plants can be effectively promoted by adding the industrial brown sugar.
Specifically, furfural waste water is added in step S3 until the pH in the mixture B is between 6.3 and 6.7, preferably the pH is 6.5; optionally, the water content in the mixture B is in the range of 65% to 70% by adding supplementary water, preferably the water content is 65%. According to the preparation method of the organic fertilizer, the furfural wastewater can be used for adjusting the initial pH value, and meanwhile, a large amount of acid substances in the furfural wastewater can also be used for pretreating auxiliary material straw particles and biogas residues in a substrate, so that three elements (lignin, cellulose and hemicellulose) in the two components are fully degraded, the compost starting speed is higher, and the organic matter is more fully degraded.
Specifically, in step S4, the total amount of activated carbon, zeolite and bentonite added is 5 to 7%, preferably 6%, of the total mass of the mixture C. Wherein the mass ratio of the activated carbon to the zeolite is in the range of 2: 1 to 4.5: 1, the mass ratio of the activated carbon to the bentonite is 1: 1 to 2.5: 1, in the range of. Preferably, the mass ratio of the activated carbon, the zeolite and the bentonite is 3: 1: 2. the activated carbon can effectively promote the decomposition degree of the compost mixture, and compared with the fertilizer without the activated carbon, the composting time can be greatly reduced. Meanwhile, the addition of the activated carbon can play a certain role in nitrogen preservation on compost mixtures, remove a large amount of odorous gas in organic fertilizers and absorb NH3And H2S and other odorous gases, and can generate passivation effect on heavy metals such as Cr, Pb and Cd in soil, and reduce the content of heavy metal elements in the organic fertilizer.
Zeolite and bentonite cooperate as the auxiliary additive, can assist the active carbon to adsorb harmful substance such as heavy metal in the compost in-process, especially to the Cu of fertilizer preparation in-process, Pb and Zn element adsorb to and waste gas even harmful gas adsorb, reduce the pollution to the environment in the fertilizer use. Moreover, the addition of the zeolite and the bentonite can increase the porosity of the organic fertilizer, so that the organic fertilizer in the finished fertilizer has good adsorbability, adsorbable pollutants and partial heavy metals in the soil can be adsorbed and degraded, the environmental pollution is effectively reduced, the content of the heavy metals is reduced, and the soil fertility is improved.
Specifically, the composting of the embodiment includes stacking the mixture C in long-strip stacks, wherein the stacking height is in a range from 1.3 m to 1.5 m, turning the stacks every 3 days to 5 days, and the composting time is in a range from 60 days to 70 days. The method comprises the steps of composting, drying, wherein the drying is carried out in a vacuum drying oven in a decompression mode until the water content of organic fertilizer after composting is in a range of 15-20%, carrying out extrusion forming granulation through an extruder, crushing and screening to prepare granular organic fertilizer with a certain particle size, and after the organic fertilizer is applied to soil, the total nitrogen content, the quick-acting phosphorus content, the quick-acting potassium content and the water holding rate in the soil are increased, the volume weight of the soil is reduced, and the seed germination rate and the growth vigor of crops after application are improved remarkably.
In the embodiment, the problems of low composting efficiency, insufficient utilization of substrates, low decomposition degree, odor gas, greenhouse gas and the like generated in the composting process are solved by regulating and controlling initial composting parameters such as initial carbon-nitrogen ratio, water content and the like of compost and the addition proportion of activated carbon in the composting process, and meanwhile, the nutrition of the finished fertilizer after composting is more comprehensive. And due to the addition of the activated carbon, the water holding rate of the organic fertilizer can be improved, the nutrient utilization rate of the organic fertilizer is increased, the release amount of heavy metals in the organic fertilizer is reduced, the organic fertilizer in a finished fertilizer product has good adsorbability, adsorbable pollutants and partial heavy metals in soil can be adsorbed and degraded, the environmental pollution is effectively reduced, the heavy metal content is reduced, and the soil fertility is improved.
Example one
On the basis of the above embodiment, this embodiment provides a specific preparation method of an organic fertilizer, which includes the following steps:
s1, cutting the straws into strips of 2-3 cm, putting the strip-shaped straw particles into a stirrer for stirring for 8min, and smashing the straw particles;
step S2, adding biogas residues into the stirrer, wherein the mass ratio of the biogas residues to the straw particles is 8: 1, stirring for 5min, and fully and uniformly mixing biogas residues and straw particles to form a mixture A;
step S3, gradually adding industrial brown sugar into the mixture A to adjust the carbon-nitrogen ratio until the carbon-nitrogen ratio in the reaction system reaches 30: 1, adding supplementary water or biogas slurry to adjust the water content to 65%, and stirring for 5min to form a mixture B;
step S4, adding activated carbon, zeolite and bentonite into the mixture B, and continuing stirring for 5min to form a mixture C; wherein the total mass of the activated carbon, the zeolite and the bentonite accounts for 6% of the mixture C, and the mass ratio of the activated carbon to the zeolite to the bentonite is 3: 1: 2, and the bentonite is preferably sodium bentonite;
s5, transporting the uniformly mixed mixture C to a composting area, stacking the mixture C in a long-strip stacking manner, controlling the height to be 1.5 m, turning the pile body every 3 days, and stacking for 60 days; then the composted materials are dried in a decompression mode through a vacuum drying box to enable the water content of the composted materials to be stable to about 18 percent, and the composted materials are put into a double-roll extrusion granulator for granulation; crushing and screening the large pieces formed by extrusion to obtain the solid finished organic fertilizer with a certain particle size. The dried substances are looser by adopting reduced pressure drying, so that the subsequent forming is easier, and the drying temperature of the reduced pressure drying is lower, so that the strains in the dried substances can keep higher activity and can not be inactivated due to high temperature.
Specifically, this embodiment adopts the technology of extrusion, compares with traditional granulation mode, and the improvement that is showing the intensity of fertilizer, has reduced the returning charge rate of fertilizer.
The organic fertilizer prepared by the preparation method is analyzed in terms of organic matter mass fraction, total nutrients, moisture mass fraction, pH value, arsenic, mercury, lead, cadmium and chromium content, and is compared with new organic fertilizer standards, and specific results are shown in table 1.
TABLE 1 contents of nutrients, water and heavy metals in organic fertilizer
| Detecting item names | NY525-2012 | Measured in fact |
| Organic matter mass fraction (in oven dried basis)% | 45 | 50.35 |
| Total nutrient (TN + P)2O5+K2O) (based on the dry basis),% | 5.0 | 7.52 |
| Water (fresh sample) mass fraction% | 30 | 15 |
| PH value (pH) | 5.5～8.5 | 6.5 |
| Total arsenic (As) (on a dried basis), mg/kg | 15 | 9.26 |
| Total mercury (Hg) (on a dried basis), mg/kg | 2 | 1.28 |
| Total lead (Pb) (on a dry basis), mg/kg | 50 | 35.84 |
| Total cadmium (Cd) (on a dried basis), mg/kg | 3 | 1.36 |
| Total chromium (Cr) (on a dried basis), mg/kg | 150 | 44.95 |
As shown in Table 1, the organic fertilizer prepared by the preparation method of the organic fertilizer has the organic matter and total nutrient reaching the standard content of the organic fertilizer, has low water content, and the contents of arsenic, mercury, lead, cadmium and chromium are all lower than the standard content of the organic fertilizer, so that the use standard of the organic fertilizer is met, the content of nutrient substances is greatly improved, and the content of heavy metal elements is reduced.
Example two
In this example, on the basis of the above examples, the experimental sample with activated carbon added is compared with the blank sample without activated carbon added, wherein the added amount of activated carbon is 2% of the total mass of the mixture C, and the composting time, total nitrogen content, NH content3Removal amount and H2The results of comparison of the S removal amounts are shown in Table 2.
TABLE 2 parameter table for adding activated carbon to prepare organic fertilizer and not adding activated carbon to prepare organic fertilizer
As can be seen from the table 2, the activated carbon can shorten the composting time by about 15 days, and the total nitrogen content is also approximately doubled, so that the content of nitrogen elements in the organic fertilizer is greatly improved. And the activated carbon can remove most of odorous gases generated in the composting process, wherein NH3The removal rate can reach 82 percent, H2S removal rate can be up toAnd the pollution to the environment in the composting process and the organic fertilizer using process is reduced by 75 percent. Experiments show that the time spent on the organic fertilizer prepared by the preparation method when the Germination Index (GI) of seeds reaches 80% is shortened by 4-5 days compared with the time spent on the organic fertilizer without adding activated carbon, so that the time spent on composting of the organic fertilizer is shortened, and the preparation efficiency of the organic fertilizer is improved.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. A preparation method of an organic fertilizer is characterized by comprising the following steps:
step S1, processing the straws into straw particles, and placing the straw particles into a stirrer for stirring;
step S2, adding the biogas residues into the stirrer to be stirred to form a mixture A;
step S3, adding industrial brown sugar into the mixture A to adjust the carbon-nitrogen ratio, adding furfural wastewater to adjust the pH value, and continuing stirring to form a mixture B;
step S4, adding activated carbon, zeolite and bentonite into the mixture B, and continuously stirring to form a mixture C;
and step S5, composting, drying, granulating and screening the mixture C to prepare the organic fertilizer.
2. The method for preparing organic fertilizer according to claim 1, wherein in step S1, the straw is processed into a strip shape with a length of 2cm to 3cm, and the strip-shaped straw particles are placed into the stirrer and stirred for 7min to 8 min.
3. The method for preparing organic fertilizer according to claim 1, wherein in the step S2, the mass ratio of the biogas residues to the straw particles put into the stirrer is 7: 1 to 9: 1, in the range of.
4. The method for preparing organic fertilizer according to claim 1, wherein in the step S3, the industrial brown sugar is added until the carbon-nitrogen ratio in the mixture B is 25: 1 to 30: 1, in the range of.
5. The method for preparing organic fertilizer according to claim 4, wherein supplementary water is further added in the step S3 until the water content in the mixture B reaches 65-70%.
6. The method for preparing organic fertilizer according to claim 1, wherein in step S4, the total mass of the added activated carbon, zeolite and bentonite accounts for 5-7% of the total mass of the mixture C.
7. The preparation method of the organic fertilizer as claimed in claim 6, wherein the mass ratio of the activated carbon to the zeolite is 2: 1 to 4.5: 1, the mass ratio of the activated carbon to the bentonite is 1: 1 to 2.5: 1, in the range of.
8. The method for preparing organic fertilizer according to claim 1, wherein the step S5 is implemented by granulating through extrusion molding.
9. The method for preparing a biochar-based organic fertilizer as claimed in claim 1, wherein in the step S5, the composting the mixture C comprises:
stacking the mixture C in a strip-shaped manner, wherein the stacking height is in a range of 1.3-1.5 m, turning the mixture C at intervals of 3-5 days, and the stacking time is in a range of 50-60 days.
10. The preparation method of the biochar-based organic fertilizer as claimed in claim 1, wherein the drying is carried out in a decompression type manner by adopting a vacuum drying oven until the moisture content of the materials is within a range of 15-20%.
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