CN112225419B - Method for resource utilization of livestock and poultry manure - Google Patents
Method for resource utilization of livestock and poultry manure Download PDFInfo
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- CN112225419B CN112225419B CN202011036448.0A CN202011036448A CN112225419B CN 112225419 B CN112225419 B CN 112225419B CN 202011036448 A CN202011036448 A CN 202011036448A CN 112225419 B CN112225419 B CN 112225419B
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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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
- C02F11/00—Treatment of sludge; Devices therefor
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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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- 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 method for recycling livestock and poultry manure, and belongs to the technical field of waste treatment and disposal. The method for resource utilization of livestock and poultry manure provided by the invention comprises the following steps: (1) mixing the livestock and poultry manure with sulfuric acid to obtain mixed feed liquid; (2) carrying out hydrothermal carbonization treatment on the mixed material liquid, and then carrying out solid-liquid separation on the obtained product system to obtain a hydrothermal liquid and a solid carbonized product; (3) mixing the hydrothermal solution with lime water to obtain a liquid containing a bactericide component; mixing the solid carbonized product with a potassium hydroxide solution to obtain a mixed material with the pH value of 6.0-8.0, and drying the mixed material to be used as a soil conditioner; or mixing the mixed material with livestock and poultry manure and urea, and then performing composting fermentation to obtain the carbon-based organic fertilizer. The method provided by the invention can realize harmless and quantitative reduction treatment of the whole process of the livestock and poultry manure, and can realize the resource utilization of the whole elements of the livestock and poultry manure.
Description
Technical Field
The invention relates to the technical field of waste treatment and disposal, in particular to a method for recycling livestock and poultry manure.
Background
The livestock and poultry manure is complex in components, is rich in organic matters, mineral elements such as nitrogen, phosphorus, potassium and the like, plant nutrient components, and also contains toxic and harmful substances such as urate, sulfide, amine compounds, bacteria, insect eggs, antibiotics, copper, zinc and the like, and is easy to generate greenhouse gas and harmful gas. At present, the mainstream treatment technology of domestic and foreign animal manure is aerobic composting and anaerobic fermentation. Converting the livestock and poultry manure into decomposed organic fertilizer through aerobic composting; anaerobic fermentation, which aims at energy production, produces not only biogas but also a large amount of biogas slurry and biogas residues. However, the composting and decomposing process of the livestock and poultry manure is long in period and wide in occupied area, odor and percolate are easily generated, and the decomposed organic fertilizer is large in amount; the biogas slurry/biogas residue produced by anaerobic fermentation has high water content, high transportation cost and easy generation of secondary pollution. In addition, the problem of residue of heavy metals such as copper in the fermentation products of livestock and poultry manure cannot be effectively solved no matter anaerobic fermentation or aerobic composting, and the problem of food safety is caused by accumulation of heavy metals in soil crops along with the fertilizing application of compost products or biogas slurry/biogas residues. Therefore, at present, advanced and applicable livestock manure reduction, harmless treatment and resource utilization technologies are urgently needed to be developed so as to better balance the relationship between regional ecological environment protection and healthy development of livestock breeding industry.
Disclosure of Invention
The invention aims to provide a method for recycling livestock and poultry manure, which can realize the reduction, harmless treatment and recycling of the livestock and poultry manure.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for resource utilization of livestock and poultry manure, which comprises the following steps:
(1) mixing the livestock and poultry manure with sulfuric acid to obtain mixed feed liquid;
(2) carrying out hydrothermal carbonization treatment on the mixed material liquid, and then carrying out solid-liquid separation on the obtained product system to obtain a hydrothermal liquid and a solid carbonized product;
(3) mixing the hydrothermal solution with lime water to obtain a liquid containing a bactericide component;
mixing the solid carbonized product with a potassium hydroxide solution to obtain a mixed material with the pH value of 6.0-8.0, and drying the mixed material to be used as a soil conditioner; or mixing the mixed material with livestock and poultry manure and urea, and then performing composting fermentation to obtain the carbon-based organic fertilizer.
Preferably, the solid content of the livestock and poultry manure in the step (1) and the step (3) is 10-90 wt% independently, and the copper ion content is 100-2000 mg/kg independently.
Preferably, the molar ratio of the copper ions in the livestock and poultry manure to the sulfate ions in the sulfate in the step (1) is 1: (1.0-2.0), wherein the concentration of the sulfuric acid is 1-10 wt%.
Preferably, the solid content of the mixed feed liquid in the step (1) is 10-60 wt%.
Preferably, the temperature of the hydrothermal carbonization reaction in the step (2) is 120-280 ℃ and the time is 0.5-6 h.
Preferably, the molar ratio of copper ions in the hydrothermal solution to calcium ions in the limewater in the step (3) is 1: (2-5).
Preferably, the concentration of the potassium hydroxide solution in the step (3) is 1-10 wt%.
Preferably, the mass ratio of the mixed materials to the livestock and poultry manure in the step (3) is 1: (5-20); the dosage of the urea is such that the carbon-nitrogen ratio in the system is (20-30): 1 is taken as a reference.
Preferably, the temperature of the composting fermentation is 50-60 ℃, and the time is 7-15 days.
Preferably, during the composting fermentation process, the surface of the compost body is covered with a plastic film or a mud seal.
The invention provides a method for resource utilization of livestock and poultry manure, which comprises the following steps: (1) mixing the livestock and poultry manure with sulfuric acid to obtain mixed feed liquid; (2) carrying out hydrothermal carbonization treatment on the mixed material liquid, and then carrying out solid-liquid separation on the obtained product system to obtain a hydrothermal liquid and a solid carbonized product; (3) mixing the hydrothermal solution with lime water to obtain a liquid containing a bactericide component; mixing the solid carbonized product with a potassium hydroxide solution to obtain a mixed material with the pH value of 6.0-8.0, and drying the mixed material to be used as a soil conditioner; or mixing the mixed material with livestock and poultry manure and urea, and then performing composting fermentation to obtain the carbon-based organic fertilizer. The method provided by the invention can realize harmless and quantitative reduction treatment of the whole process of the livestock and poultry manure, and can realize the resource utilization of the whole elements of the livestock and poultry manure. Specifically, the livestock and poultry manure is treated by a hydrothermal carbonization method, so that the solid body amount can be greatly reduced (by 50-80%), bacteria, insect eggs and the like are thoroughly killed, organic pollutants such as antibiotics and the like are fully cracked, the generation of malodor is reduced, and carbon fixation and recovery of plant nutrient components can be realized.
In addition, the method provided by the invention has the advantages of simple operation steps, mild reaction conditions and high biomass charcoal yield, is a new way for value-added conversion and resource utilization of livestock and poultry manure, and has great practical significance for promoting harmless, quantitative reduction and resource utilization of livestock and poultry breeding waste, solving the contradiction between concentrated discharge of livestock and poultry breeding waste and insufficient land bearing capacity and balancing the contradiction between regional ecological environment protection and sustainable development of livestock and poultry breeding.
Drawings
FIG. 1 is a process flow diagram of the livestock and poultry manure resource utilization method of the invention.
Detailed Description
The invention provides a method for resource utilization of livestock and poultry manure, which comprises the following steps:
(1) mixing the livestock and poultry manure with sulfuric acid to obtain mixed feed liquid;
(2) carrying out hydrothermal carbonization treatment on the mixed feed liquid, and then carrying out solid-liquid separation on the obtained product system to obtain hydrothermal liquid and a solid carbonized product;
(3) mixing the hydrothermal solution with lime water to obtain a liquid containing a bactericide component;
mixing the solid carbonized product with a potassium hydroxide solution to obtain a mixed material with the pH value of 6.0-8.0, and drying the mixed material to be used as a soil conditioner; or mixing the mixed material with livestock and poultry manure and urea, and then performing composting fermentation to obtain the carbon-based organic fertilizer.
The invention mixes the livestock and poultry manure with sulfuric acid to obtain mixed feed liquid. The source of the livestock and poultry manure is not particularly limited, and the livestock and poultry manure comprises but is not limited to fresh manure, bedding materials or biogas slurry and biogas residues after anaerobic fermentation treatment of livestock and poultry raised in intensive scale such as chicken, pigs, cows and the like. In the invention, the solid content of the livestock and poultry manure is preferably 10-90 wt%, and specifically 10-30 wt%, 20-50 wt%, 30-50 wt% or 40-70 wt%; the preferable copper ion content is 100-2000 mg/kg, and more specifically, 200-500 mg/kg, 500-1000 mg/kg, 500-2000 mg/kg or 800-1500 mg/kg. In the present invention, the concentration of the sulfuric acid is preferably 1 to 10 wt%, and specifically may be 1 wt%, 5 wt%, or 10 wt%. In the present invention, the molar ratio of copper ions to sulfate ions in the animal manure is preferably 1: (1.0-2.0), specifically 1:1.0, 1:1.5, or 1:2.0, which is beneficial to ensure that copper ions are fully combined with sulfate radicals to form copper sulfate.
In the invention, the solid content of the mixed feed liquid obtained by mixing the livestock and poultry manure and the sulfuric acid is preferably 20-40 wt%, and specifically can be 20 wt%, 30 wt% or 40 wt%; specifically, if the solid content of the mixed feed liquid obtained by mixing the livestock and poultry manure and the sulfuric acid is high, the solid content can be adjusted by adding water, so that the requirements can be met.
After the mixed material liquid is obtained, the invention carries out hydrothermal carbonization treatment on the mixed material liquid, and then carries out solid-liquid separation on the obtained product system to obtain hydrothermal liquid and a solid carbonized product. In the invention, the temperature of the hydrothermal carbonization reaction is preferably 120-280 ℃, and specifically can be 120 ℃, 200 ℃ or 280 ℃; the time of the hydrothermal carbonization reaction is preferably 0.5-6 h, and specifically can be 0.5h, 2h or 6 h. In the invention, the hydrothermal carbonization treatment is preferably carried out in a hydrothermal reaction kettle. According to the invention, the system obtained by the hydrothermal carbonization treatment is preferably cooled to room temperature and then subjected to solid-liquid separation, and the solid-liquid separation mode is not particularly limited, and can be realized by adopting a mode known by persons skilled in the art, such as suction filtration.
The invention mixes the livestock and poultry manure with sulfuric acid, carries out hydrothermal carbonization treatment on the obtained mixed feed liquid, and utilizes autogenous pressure to pyrolyze and carbonize the livestock and poultry manure to generate a solid carbonized product, hydrothermal liquid and a small amount of gas (such as water vapor and CO)2Etc.); 50-90% of copper ions and zinc ions in the livestock and poultry manure are transferred to the hydrothermal solution, and then the solid carbonized product and the hydrothermal solution are respectively treated correspondingly, so that the full-element resource utilization of the livestock and poultry manure can be realized. In the invention, zinc in the solid carbonized product and the hydrothermal solution belongs to nutrient elements, and the zinc content does not need to be considered when the solid carbonized product or the hydrothermal solution is treated.
After obtaining the hydrothermal solution, the invention preferably further removes impurities from the hydrothermal solution by sand filtration, and then mixes the obtained filtrate with lime water to obtain a liquid containing a bactericide component. The addition amount of the limewater is preferably determined according to the content of copper ions in the hydrothermal solution, wherein the molar ratio of the copper ions in the hydrothermal solution to the calcium ions in the limewater is preferably 1: (2-5), specifically 1:2, 1:2.5, 1:4 or 1: 5. In the invention, the liquid containing the bactericide component has the effects of both bactericide and liquid fertilizer, and particularly, the liquid containing the bactericide component is Bordeaux mixture (the effective component is CuSO)4·xCu(OH)2·yCa(OH)2·zH2O), has bactericidal effect, and can be used for preventing and treating grape anthracnose, white rot, anthracnose, downy mildew, potato late blight, etc.; at the same time, because of the hydrothermal liquidContains zinc ions, small molecular organic acid (such as fulvic acid or humic acid) and nitrogen, phosphorus, potassium and other nutrient components, thereby having the effect of liquid fertilizer.
After a solid carbonized product is obtained, the solid carbonized product is mixed with a potassium hydroxide solution to obtain a mixed material with the pH value of 6.0-8.0, and the mixed material is dried and then used as a soil conditioner. In the present invention, the concentration of the potassium hydroxide solution is preferably 1 to 10 wt%, and specifically may be 1 wt%, 5 wt%, or 10 wt%. According to the invention, an applicable soil type is further selected preferably according to the pH value of the mixed material, specifically, when the pH value of the mixed material is 6.0-7.0, the mixed material is a slightly acidic product and can be used as a modifier for alkaline soil (such as saline-alkali soil and greenhouse soil); when the pH value of the mixed material is 7.0-8.0, the mixed material is a slightly alkaline product and can be used as a modifier for acid soil (such as a paddy field). The concrete use mode of the soil conditioner is not particularly limited, and a method well known to those skilled in the art can be adopted.
The invention can also mix the mixed material with livestock and poultry manure and urea and then carry out composting fermentation to obtain the carbon-based organic fertilizer. In the present invention, the source, solid content and optional range of copper ion content of the livestock manure are preferably the same as those of the livestock manure in the above technical solution, and are not described herein again. In the invention, the mass ratio of the mixed material to the livestock and poultry manure is preferably 1: (5-20), specifically 1:5, 1:10 or 1: 20; the dosage of the urea is preferably such that the carbon-nitrogen ratio (the ratio of the total content of carbon to the total content of nitrogen in the system) in the system is (20-30): 1 as a reference, the carbon-nitrogen ratio can be specifically 20:1, 25:1 or 30: 1. In the present invention, the nitrogen content of the urea is preferably 45 wt%.
In the invention, the temperature of the composting fermentation is preferably 50-60 ℃, and the time is preferably 7-15 days. In the present invention, during the composting fermentation process, the surface of the compost is preferably covered with a plastic film or a mud seal. The specific operation mode of the composting fermentation is not particularly limited in the present invention, and can be a mode known to those skilled in the art.
FIG. 1 is a process flow diagram of a method for recycling livestock and poultry manure, in which livestock and poultry manure is mixed with sulfuric acid and then subjected to hydrothermal carbonization treatment, and then the obtained product system is subjected to solid-liquid separation to obtain hydrothermal solution and a solid carbonized product; mixing the hydrothermal solution with lime water to obtain liquid containing bactericide component (effective component is CuSO)4·xCu(OH)2·yCa(OH)2·zH2O, can prevent and treat grape anthracnose, white rot, anthracnose, downy mildew, potato late blight and the like); mixing the solid carbonized product with a potassium hydroxide solution to obtain a mixed material with a pH value of 6.0-8.0, wherein the mixed material can be directly used as a soil conditioner after being dried, a slightly acidic product can be used as a conditioner for alkaline soil (such as saline-alkali soil and greenhouse soil) when the pH value of the mixed material is 6.0-7.0, and a slightly alkaline product can be used as a conditioner for acidic soil (such as a paddy field) when the pH value of the mixed material is 7.0-8.0; or mixing the mixed material with livestock and poultry manure and urea, and then performing composting fermentation to obtain the carbon-based organic fertilizer.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The livestock and poultry manure in the embodiment is pig manure in a pig farm, the solid content is 30-50 wt%, and the Cu content is2+The content is 800-1500 mg/kg; the method for treating the livestock and poultry manure comprises the following steps:
mixing the livestock and poultry manure with 10 wt% sulfuric acid, wherein the molar ratio of copper ions in the livestock and poultry manure to sulfate radicals in the sulfuric acid is 1:2.0, so that copper ions are fully combined with sulfate radicals to form copper sulfate; then adjusting the solid content of the obtained system to 20 wt% by using water, transferring the system to a hydrothermal reaction kettle, heating to 120 ℃, and carrying out hydrothermal carbonization reaction for 6 hours; after the hydrothermal carbonization reaction is finished, cooling the obtained system to room temperature (25 ℃) and then carrying out suction filtration to obtain a solid carbonization product and hydrothermal liquid;
mixing a potassium hydroxide solution with a concentration of 10 wt% with the solid carbonized product to obtain a mixed system with a pH value of about 7.0, wherein the mixed system and the livestock and poultry manure are mixed in a mass ratio of 1:20, and adjusting the C/N ratio to 20:1, performing composting fermentation (the temperature is 50-60 ℃, the time is 15 days; and a plastic film covers the surface of a pile body in the fermentation process) to obtain a carbon-based organic fertilizer;
mixing the hydrothermal solution with lime water, wherein the molar ratio of copper ions in the hydrothermal solution to calcium ions in the hydrated lime is 1:4, preparing a liquid containing a bactericide component (the effective component is CuSO)4·xCu(OH)2·yCa(OH)2·zH2O)。
Example 2
The livestock and poultry manure in the embodiment is chicken manure in a chicken farm, the solid content is 40-70 wt%, and the Cu content is2+The content is 500-1000 mg/kg; the method for treating the livestock and poultry manure comprises the following steps:
mixing the livestock and poultry manure with 1 wt% sulfuric acid, wherein the molar ratio of copper ions in the livestock and poultry manure to sulfate radicals in the sulfuric acid is 1:1.0, so that copper ions are fully combined with sulfate radicals to form copper sulfate; then adjusting the solid content of the obtained system to 30 wt% by using water, transferring the system to a hydrothermal reaction kettle, heating to 280 ℃, and carrying out hydrothermal carbonization reaction for 0.5 h; after the hydrothermal carbonization reaction is finished, cooling the obtained system to room temperature (25 ℃) and then carrying out suction filtration to obtain a solid carbonization product and hydrothermal liquid;
mixing a potassium hydroxide solution with the concentration of 1 wt% with the solid carbonized product to obtain a mixed system with the pH value of about 8.0, wherein the mixed system and the livestock and poultry manure are mixed according to the mass ratio of 1:5, and adjusting the C/N ratio to 30:1, performing composting fermentation (the temperature is 50-60 ℃, the time is 10 days; and the surface of a pile body is subjected to mud sealing in the fermentation process) to obtain a carbon-based organic fertilizer;
mixing the hydrothermal solution with lime water, wherein the molar ratio of copper ions in the hydrothermal solution to calcium ions in the hydrated lime is 1:2, preparing a liquid containing a bactericide component (the effective component is CuSO)4·xCu(OH)2·yCa(OH)2·zH2O)。
Example 3
The livestock and poultry manure in the embodiment is specifically cow manure of a cattle farm, the solid content is 20-50 wt%, and the Cu content is2+The content is 200-500 mg/kg; the method for treating the livestock and poultry manure comprises the following steps:
mixing the livestock and poultry manure with 5 wt% sulfuric acid, wherein the molar ratio of copper ions in the livestock and poultry manure to sulfate radicals in the sulfuric acid is 1:1.5, fully combining copper ions with sulfate radicals to form copper sulfate; then adjusting the solid content of the obtained system to 15 wt% by using water, transferring the system to a hydrothermal reaction kettle, heating to 120 ℃, and carrying out hydrothermal carbonization reaction for 6 hours; after the hydrothermal carbonization reaction is finished, cooling the obtained system to room temperature (25 ℃) and then carrying out suction filtration to obtain a solid carbonization product and hydrothermal liquid;
mixing a 5 wt% potassium hydroxide solution with the solid carbonized product to ensure that the pH value of the obtained mixed system is 7.0-8.0, and directly using the obtained material as an improver for acid soil (specifically a paddy field);
mixing the hydrothermal solution with lime water, wherein the molar ratio of copper ions in the hydrothermal solution to calcium ions in the hydrated lime is 1:2.5 preparing a liquid containing a bactericide component (the effective component is CuSO)4·xCu(OH)2·yCa(OH)2·zH2O)。
Example 4
In the embodiment, the livestock and poultry manure is solid biogas residue obtained by anaerobic fermentation of the manure in a pig farm, the solid content is 10-30 wt%, and the Cu content is2+The content is 500-2000 mg/kg; the method for treating the livestock and poultry manure comprises the following steps:
mixing the livestock and poultry manure with 10 wt% sulfuric acid, wherein the molar ratio of copper ions in the livestock and poultry manure to sulfate radicals in the sulfuric acid is 1:2.0, fully combining copper ions with sulfate radicals to form copper sulfate; then adjusting the solid content of the obtained system to 10 wt% by using water, transferring the system to a hydrothermal reaction kettle, heating to 280 ℃, and carrying out hydrothermal carbonization reaction for 0.5 h; after the hydrothermal carbonization reaction is finished, cooling the obtained system to room temperature (25 ℃) and then carrying out suction filtration to obtain a solid carbonized product and hydrothermal liquid;
mixing a potassium hydroxide solution with the concentration of 10 wt% with the solid carbonization product to ensure that the pH value of the obtained mixed system is 6.0-7.0, and directly using the obtained material as a modifier for alkaline soil (specifically saline-alkali soil);
mixing the hydrothermal solution with lime water, wherein the molar ratio of copper ions in the hydrothermal solution to calcium ions in the hydrated lime is 1:5, preparing a liquid containing a bactericide component (the effective component is CuSO)4·xCu(OH)2·yCa(OH)2·zH2O)。
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (10)
1. A method for resource utilization of livestock and poultry manure comprises the following steps:
(1) mixing the livestock and poultry manure with sulfuric acid to obtain mixed feed liquid;
(2) carrying out hydrothermal carbonization treatment on the mixed material liquid, and then carrying out solid-liquid separation on the obtained product system to obtain a hydrothermal liquid and a solid carbonized product;
(3) mixing the hydrothermal solution with lime water to obtain a liquid containing a bactericide component;
mixing the solid carbonized product with a potassium hydroxide solution to obtain a mixed material with the pH value of 6.0-8.0, and drying the mixed material to be used as a soil conditioner; or mixing the mixed material with livestock and poultry manure and urea, and then performing composting fermentation to obtain the carbon-based organic fertilizer.
2. The method as claimed in claim 1, wherein the solid content of the livestock and poultry manure in the steps (1) and (3) is 10-90 wt% independently, and the copper ion content is 100-2000 mg/kg independently.
3. The method as claimed in claim 2, wherein the molar ratio of the copper ions to the sulfate ions in the animal manure in the step (1) is 1: (1.0-2.0), wherein the concentration of the sulfuric acid is 1-10 wt%.
4. The method according to any one of claims 1 to 3, wherein the solid content of the mixed liquor in the step (1) is 10 to 60 wt%.
5. The method according to claim 1, wherein the hydrothermal carbonization reaction in the step (2) is carried out at a temperature of 120 to 280 ℃ for 0.5 to 6 hours.
6. The method of claim 1, wherein the molar ratio of copper ions in the hydrothermal solution to calcium ions in the limewater in the step (3) is 1: (2-5).
7. The method according to claim 1, wherein the concentration of the potassium hydroxide solution in the step (3) is 1 to 10 wt%.
8. The method as claimed in claim 1 or 2, wherein the mass ratio of the mixed material to the livestock and poultry manure in the step (3) is 1: (5-20); the dosage of the urea is such that the carbon-nitrogen ratio in the system is (20-30): 1 is taken as a reference.
9. The method according to claim 8, wherein the temperature of the composting fermentation is 50-60 ℃ and the time is 7-15 days.
10. The method of claim 9, wherein during the composting fermentation, the surface of the compost is covered with a plastic film or a mud seal.
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| CN105315017A (en) * | 2015-10-21 | 2016-02-10 | 宋成芳 | Method for preparing solid organic carbon fertilizer with livestock breeding waste being raw material |
| CN109232026A (en) * | 2018-10-22 | 2019-01-18 | 江西农业大学 | A kind of swine manure treatment method rapidly and efficiently |
| WO2019043031A1 (en) * | 2017-09-04 | 2019-03-07 | Suez Groupe | Method and equipment for digesting a biodegradable liquid filtrate |
| CN111423884A (en) * | 2020-04-28 | 2020-07-17 | 浙江科技学院 | Acid soil conditioner and application method and application thereof |
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| CN105315017A (en) * | 2015-10-21 | 2016-02-10 | 宋成芳 | Method for preparing solid organic carbon fertilizer with livestock breeding waste being raw material |
| WO2019043031A1 (en) * | 2017-09-04 | 2019-03-07 | Suez Groupe | Method and equipment for digesting a biodegradable liquid filtrate |
| CN109232026A (en) * | 2018-10-22 | 2019-01-18 | 江西农业大学 | A kind of swine manure treatment method rapidly and efficiently |
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