Preparation method of chicken manure water-soluble fertilizer based on liquid stage oxidation-mechanical separation technology

Abstract

The invention discloses a chicken manure water-soluble fertilizer preparation method based on a liquid stage oxidation-mechanical separation technology, and relates to the technical field of organic fertilizers. According to the method, the traditional microbial fermentation is replaced by liquid stage oxidation, a two-stage mechanical separation technology is combined, and efficient conversion of the chicken manure is realized in an innovative mode of combining the two technologies. The method does not need microbial fermentation, and is short in reaction period, high in separation efficiency and high in product stability.

Description

Technical Field

[0001] This invention relates to the field of organic fertilizer technology, and more specifically to a method for preparing chicken manure water-soluble fertilizer based on liquid segmented oxidation-mechanical separation technology. Background Technology

[0002] Chicken manure, a major waste product in agriculture and animal husbandry, is rich in organic matter, nitrogen, phosphorus, potassium, and other natural nutrients, making it an important raw material for preparing organic water-soluble fertilizers. However, due to the inherent characteristics of chicken manure, there are some drawbacks in fertilizer preparation. For example, chicken manure has a high density, requiring mixing with materials such as rice husks, leaves, or straw to improve aeration during fermentation. Chicken manure fermentation also requires strict control of moisture content, generally between 50% and 60% (not dripping wet when squeezed by hand); too high a moisture content can lead to anaerobic fermentation, while too low a moisture content slows down microbial activity. Furthermore, traditional microbial fermentation processes have long reaction cycles (usually 20-30 days) and are greatly affected by environmental temperature, making continuous industrial production difficult.

[0003] Chinese invention patent application CN201510499602.0 discloses a method for manufacturing refined water-soluble organic fertilizer by converting chicken manure into organic fertilizer. The method is based on the traditional process of microbial composting and fermentation. It decomposes the macromolecular organic matter in chicken manure through compound microbial agents, and then produces the product through solid-liquid separation and nutrient formulation. Some of its technologies use membrane separation technology to improve product purity, but it still relies on the microbial fermentation process.

[0004] Therefore, providing a method for preparing chicken manure fertilizer that does not require microbial fermentation and has high product stability is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a method for preparing chicken manure water-soluble fertilizer based on liquid-phase segmented oxidation-mechanical separation technology. This method requires no microbial fermentation, has a short reaction cycle, high separation efficiency, and strong product stability.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A method for preparing chicken manure water-soluble fertilizer based on liquid segmented oxidation-mechanical separation technology includes the following steps: S1 Ingredients: Determine the moisture content of fresh chicken manure, add water according to the actual moisture content to make the solid content in the mixture reach 20%, and stir into a slurry; add sodium humate at 1-2% of the slurry mass, and adjust the pH to 7.0-7.5 with sodium hydroxide; S2 segmented oxidation: S21: The slurry is introduced into the oxidation reactor, and ozone at a concentration of 80-100 mg / L is introduced through an annular gas distribution device at a flow rate of 0.8-1.2 L / (min). L slurry), control the stirring speed at 200-250 r / min, the temperature at 40-45℃, and react for 2-3 hours; S22: Stop the ozone supply, add calcium peroxide at 0.5-0.8% of the slurry mass, heat to 50-55℃, and continue stirring for 3-4 hours to obtain an oxidized liquid; S3 solid-liquid separation: S31 Primary Separation: The oxidizing solution is introduced into a disc centrifuge and separated at a speed of 3000-4000 r / min and a separation factor of 1500-2000. The filtrate is then collected. S32 Secondary Separation: The filtrate is introduced into a tubular centrifuge and separated at a speed of 8000-10000 r / min and a separation factor of 8000-10000 to obtain a clear liquid; S4 Photoelectrocatalytic Purification: The clarified liquid is introduced into an ultraviolet-hydrogen peroxide coupled reaction device, and hydrogen peroxide with a concentration of 27% is added at a mass of 0.3-0.5% of the clarified liquid. The reaction is carried out at an ultraviolet wavelength of 254nm for 20-30 minutes. After filtration through a 500-800 mesh filter cloth, purified liquid I is obtained. S5 Functional Configuration: S51: Add chitosan-sodium alginate composite-encapsulated trace elements to purified liquid I to achieve a total concentration of trace elements of 0.5-1 g / L, thus obtaining purified liquid II; Among them, the trace elements encapsulated by chitosan-sodium alginate are prepared by complex coagulation method, and the mass ratio of chitosan-sodium alginate to trace elements is (4-6):1; the mass ratio of chitosan to sodium alginate in chitosan-sodium alginate is 3:2; the trace elements include calcium nitrate, magnesium sulfate and zinc sulfate, and the molar ratio of the three is 3:2:1. S52: Add 0.2-0.4% phytosterol to the purified liquid II, adjust the pH to 5.6-7.0, stir well, and obtain the finished product.

[0007] This invention utilizes a liquid-phase staged oxidation process to replace traditional microbial fermentation, combined with two-stage mechanical separation technology, to achieve efficient conversion of chicken manure through an innovative combination of these two technologies. The first stage of the staged oxidation, ozone oxidation, is limited to the 40-45℃ range. At this temperature, ozone can efficiently oxidize organic pollutants, primarily by enhancing reaction efficiency in two ways: ① Accelerating the reaction kinetics between ozone and pollutants: Increased temperature enhances the molecular activity of organic matter (such as proteins, carbohydrates, and sulfur / nitrogen-containing compounds) in fresh chicken manure, accelerating their collision frequency with ozone, and particularly promoting ozone decomposition. OH (hydroxyl radicals) enhances the degradation efficiency of recalcitrant organic matter (such as crude fiber and residual antibiotics in chicken manure). ② Avoid excessive ozone depletion: Ozone solubility in water decreases with increasing temperature (approximately 11 mg / L at 20℃, dropping to approximately 6 mg / L at 45℃), but the decrease at 40-45℃ is controllable, and the loss of solubility can be compensated by using a variable frequency injection method of "segmented oxidation" (maintaining 6 mg of ozone). If the temperature exceeds 50℃, ozone will rapidly decompose (half-life shortened to within 10 minutes), leading to a sharp drop in effective utilization and increased energy consumption. The second stage of segmented oxidation, calcium peroxide oxidation, provides slow-release oxygen and secondary free radical production. In this system, calcium peroxide is not directly oxidized, but reacts with moisture and acidic substances in the chicken manure slurry to achieve "stepwise release of active oxygen," providing continuous power for deep oxidation. The reaction process is as follows: Step 1: Slowly release hydrogen peroxide (H2O2) When calcium peroxide reacts with water in the slurry, the system is sufficiently moist, and the reaction occurs: CaO2 + 2H2O → Ca(OH)2 + H2O2. This reaction is mild and slow, avoiding the "instantaneous boiling" caused by directly adding H2O2, and continuously providing H2O2 (oxidant precursor) to the system to compensate for the oxidant deficiency after ozone is stopped.

[0008] Step 2: Inducing H2O2 production by heating OH (hydroxyl radical) Heating to 50-55℃ is the key triggering condition: on the one hand, the increased temperature accelerates the decomposition of H2O2 (2H2O2→2H2O +O2↑); on the other hand, the residual Fe²⁺ in the chicken manure slurry... + Mn² + Metal ions (trace elements naturally present in fresh chicken manure) act as catalysts, reacting with H₂O₂ in a "Fenton reaction": Fe 2+ +H₂O₂→ Fe 3+ +·OH+OH - The generated OH has an oxidation potential as high as 2.8V, which is much stronger than ozone (2.07V). It can efficiently degrade recalcitrant organic matter that is difficult to decompose by ozone (such as crude fiber, residual antibiotics, and stubborn sulfur / nitrogenous malodorous substances in chicken manure).

[0009] Furthermore, this invention utilizes microencapsulation technology, employing chitosan and sodium alginate, two natural polysaccharides, as encapsulation materials to encapsulate trace elements. Sodium alginate carries a negative charge in aqueous solution, while chitosan carries a positive charge under acidic conditions. When the two meet, they aggregate through electrostatic interaction, forming a dense microcapsule wall that encapsulates the internal trace element solution. This prevents the trace elements from reacting with certain components in the refined solution (such as acids, phenols, tannins, etc.), leading to precipitation, discoloration, oxidation, or flavor deterioration, and also improves bioavailability. In this invention, the mass ratio of chitosan to sodium alginate is 3:2. This ratio ensures that the positive and negative charges of the two polysaccharides are optimally balanced, forming the most stable and efficient microcapsule structure. The ratio of (chitosan + sodium alginate): micronutrients = (4-6):1, calcium: magnesium: zinc = 3:2:1 (molar ratio) can form a complex with the functional groups on chitosan / sodium alginate, making the water-soluble fertilizer more stable and easier for plants to absorb.

[0010] As a preferred technical solution, in the S1 batching, the amount of sodium humate added accounts for 1.5% of the slurry mass, and the pH is adjusted to 7.2 with sodium hydroxide.

[0011] As a preferred technical solution, in the S2 segmented oxidation, S21: The slurry is introduced into the oxidation reactor, and ozone with a concentration of 90 mg / L is introduced through the annular gas distribution device at a flow rate of 1.0 L / (min). L slurry), control the stirring speed at 220 r / min, the temperature at 42℃, and react for 2.5 hours; S22: Stop the ozone supply, add calcium peroxide at 0.6% of the slurry mass, heat to 52℃, and continue stirring for 3.5 hours to obtain an oxidized liquid; As a preferred technical solution, in the S3 solid-liquid separation, S31 Primary separation: The oxidizing solution is introduced into a disc centrifuge and separated at a speed of 3500 r / min and a separation factor of 1800. The filtrate is then collected. S32 Secondary Separation: The filtrate is introduced into a tubular centrifuge and separated at a speed of 9000 r / min and a separation factor of 9000 to obtain a clear liquid.

[0012] As a preferred technical solution, in the S4 photoelectrocatalytic purification process, the clarified liquid is introduced into an ultraviolet-hydrogen peroxide coupling reaction device, and hydrogen peroxide with a concentration of 27% is added, accounting for 0.4% of the mass of the clarified liquid. The reaction is carried out at an ultraviolet wavelength of 254nm for 25 minutes, and then filtered through a 600-mesh filter cloth to obtain purified liquid I.

[0013] As a preferred technical solution, in the S5 functional configuration, S51: Add chitosan-sodium alginate composite-encapsulated trace elements to purified solution I to achieve a total concentration of trace elements of 0.7 g / L, thus obtaining purified solution II; The trace elements encapsulated in the chitosan-sodium alginate composite were prepared using the complex coagulation method. The mass ratio of chitosan-sodium alginate to trace elements was 5:1. The mass ratio of chitosan to sodium alginate in the chitosan-sodium alginate was 3:2. The trace elements included calcium nitrate, magnesium sulfate, and zinc sulfate, and the molar ratio of the three was 3:2:1. S52: Add 0.3% phytosterol to purified liquid II, adjust the pH to 6.8, stir well, and obtain the finished product.

[0014] Another object of the present invention is to provide a water-soluble fertilizer for chicken manure prepared by the above preparation method.

[0015] Another object of the present invention is to provide the application of the product prepared by the above preparation method or the above-mentioned chicken manure water-soluble fertilizer in agricultural production.

[0016] Beneficial Effects: The preparation method of chicken manure water-soluble fertilizer of this invention integrates ozone-calcium peroxide two-stage oxidation with two-stage mechanical separation, ultraviolet-hydrogen peroxide purification, and composite encapsulation stabilization to form a continuous, low-maintenance, and highly stable water-soluble fertilizer production process. This process significantly shortens the reaction cycle compared to traditional processes and is unaffected by environmental factors such as temperature. Two-stage mechanical separation (disc centrifuge + tubular centrifuge) replaces membrane separation, avoiding membrane fouling problems and reducing equipment maintenance costs by more than 50%, while maintaining a stable separation efficiency of over 95%.

[0017] The prepared product exhibits high stability, with a storage stability of over 6 months and no stratification or sedimentation. Furthermore, it demonstrates excellent fertilizer efficacy, boasting high levels of water-soluble organic matter and total nitrogen, phosphorus, and potassium, and is rich in slow-release trace elements, increasing crop absorption rate by over 30%. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1 A method for preparing chicken manure water-soluble fertilizer based on liquid segmented oxidation-mechanical separation technology Includes the following steps: S1 Ingredients: Determine the moisture content of fresh chicken manure. Based on the actual moisture content, add water to bring the solids content of the mixture to 20%, and stir to form a slurry. Add sodium humate at 1.5% of the slurry mass, and adjust the pH to 7.2 with sodium hydroxide.

[0020] S2 segmented oxidation: S21: The slurry is introduced into the oxidation reactor, and ozone with a concentration of 90 mg / L is introduced through the annular gas distribution device at a flow rate of 1.0 L / (min). L slurry), control the stirring speed at 220 r / min and the temperature at 42℃, and react for 2.5 hours.

[0021] S22: Stop the ozone supply, add calcium peroxide at 0.6% of the slurry mass, heat to 52℃, and continue stirring for 3.5 hours to obtain the oxidized liquid.

[0022] S3 solid-liquid separation: S31 Primary Separation: The oxidizing solution is introduced into a disc centrifuge (5 tons / h) and separated at a speed of 3500 r / min (separation factor 1800), and the filtrate is collected; S32 Secondary Separation: The filtrate is introduced into a tubular centrifuge (2 tons / h) and separated at a speed of 9000 r / min (separation factor 9000) to obtain a clear liquid; S4 Photoelectrocatalytic Purification: The clarified liquid is introduced into the UV-hydrogen peroxide coupled reaction device, and hydrogen peroxide with a concentration of 27% is added at 0.4% of the mass of the clarified liquid. The reaction is carried out at a UV wavelength of 254nm for 25 minutes, and then filtered through a 600-mesh filter cloth to obtain purified liquid I. S5 Functional Configuration: S51: Add chitosan-sodium alginate composite-encapsulated trace elements to purified solution I to achieve a total concentration of trace elements of 0.7 g / L, thus obtaining purified solution II.

[0023] The trace elements encapsulated in the chitosan-sodium alginate composite were prepared using the complex coagulation method. The mass ratio of chitosan-sodium alginate to trace elements was 5:1. The mass ratio of chitosan to sodium alginate in the chitosan-sodium alginate was 3:2. The trace elements included calcium nitrate, magnesium sulfate, and zinc sulfate, and the molar ratio of the three was 3:2:1.

[0024] S52: Add 0.3% stigmasterol to purified liquid II, adjust the pH to 6.8, stir well, and obtain the finished product.

[0025] Product testing: Water-soluble organic matter 295g / L, N+P2O5+K2O=48g / L, no precipitation after 6 months of storage, crop absorption rate is 35% higher than traditional products.

[0026] Example 2 A method for preparing chicken manure water-soluble fertilizer based on liquid segmented oxidation-mechanical separation technology Includes the following steps: S1 Ingredients: Determine the moisture content of fresh chicken manure. Based on the actual moisture content, add water to bring the solid content of the mixture to 20%, and stir to form a slurry. Add sodium humate at 1% of the slurry mass, and adjust the pH to 7.0 with sodium hydroxide.

[0027] S2 segmented oxidation: S21: The slurry is introduced into the oxidation reactor, and ozone with a concentration of 80 mg / L is introduced through the annular gas distribution device at a flow rate of 0.8 L / (min). L slurry), control the stirring speed at 200 r / min and the temperature at 40℃, and react for 2 hours.

[0028] S22: Stop the ozone supply, add calcium peroxide at 0.5% of the slurry mass, heat to 50℃, and continue stirring for 3 hours to obtain the oxidized liquid.

[0029] S3 solid-liquid separation: S31 Primary Separation: The oxidizing solution is introduced into a disc centrifuge (5 tons / h) and separated at a speed of 3000 r / min (separation factor 1500), and the filtrate is collected; S32 Secondary Separation: The filtrate is introduced into a tubular centrifuge (2 tons / h) and separated at a speed of 8000 r / min (separation factor 8000) to obtain a clear liquid; S4 Photocatalytic Purification: The clarified liquid is introduced into an ultraviolet-hydrogen peroxide coupled reaction device, and hydrogen peroxide with a concentration of 27% is added at 0.3% of the mass of the clarified liquid. The reaction is carried out at an ultraviolet wavelength of 254nm for 20 minutes. After filtration through a 500-mesh filter cloth, purified liquid I is obtained. S5 Functional Configuration: S51: Add chitosan-sodium alginate composite-encapsulated trace elements to purified solution I to achieve a total concentration of trace elements of 0.5 g / L, thus obtaining purified solution II.

[0030] The trace elements encapsulated in the chitosan-sodium alginate composite were prepared using the complex coagulation method. The mass ratio of chitosan-sodium alginate to trace elements was 4:1; the mass ratio of chitosan to sodium alginate in the chitosan-sodium alginate was 3:2; the trace elements included calcium nitrate, magnesium sulfate, and zinc sulfate, and the molar ratio of the three was 3:2:1.

[0031] S52: Add 0.2% stigmasterol to purified solution II, adjust the pH to 5.6, stir well, and obtain the finished product.

[0032] Product testing: Water-soluble organic matter 286g / L, N+P2O5+K2O=46g / L.

[0033] Example 3 A method for preparing chicken manure water-soluble fertilizer based on liquid segmented oxidation-mechanical separation technology Includes the following steps: S1 Ingredients: Determine the moisture content of fresh chicken manure. Based on the actual moisture content, add water to bring the solid content of the mixture to 20%, and stir to form a slurry. Add sodium humate at 2% of the slurry mass, and adjust the pH to 7.5 with sodium hydroxide.

[0034] S2 segmented oxidation: S21: The slurry is introduced into the oxidation reactor, and ozone with a concentration of 100 mg / L is introduced through the annular gas distribution device at a flow rate of 1.2 L / (min). L slurry), control the stirring speed at 250 r / min and the temperature at 45℃, and react for 3 hours.

[0035] S22: Stop the ozone supply, add calcium peroxide at 0.8% of the slurry mass, heat to 55℃, and continue stirring for 4 hours to obtain the oxidized liquid.

[0036] S3 solid-liquid separation: S31 Primary Separation: The oxidizing liquid is introduced into a disc centrifuge (5 tons / h) and separated at a speed of 4000 r / min (separation factor 2000), and the filtrate is collected; S32 Secondary Separation: The filtrate is introduced into a tubular centrifuge (2 tons / h) and separated at a speed of 10000 r / min (separation factor 10000) to obtain a clear liquid; S4 Photocatalytic Purification: The clarified liquid is introduced into the UV-hydrogen peroxide coupled reaction device, and hydrogen peroxide with a concentration of 27% is added at 0.5% of the mass of the clarified liquid. The reaction is carried out at a UV wavelength of 254nm for 30 minutes. After filtration through an 800-mesh filter cloth, purified liquid I is obtained. S5 Functional Configuration: S51: Add chitosan-sodium alginate composite-encapsulated trace elements to purified solution I to achieve a total concentration of trace elements of 1 g / L, thus obtaining purified solution II.

[0037] The trace elements encapsulated in the chitosan-sodium alginate composite were prepared using the complex coagulation method. The mass ratio of chitosan-sodium alginate to trace elements was 6:1. The mass ratio of chitosan to sodium alginate in the chitosan-sodium alginate composite was 3:2. The trace elements included calcium nitrate, magnesium sulfate, and zinc sulfate, with a molar ratio of 3:2:1.

[0038] S52: Add 0.4% stigmasterol to purified liquid II, adjust the pH to 7.0, stir well, and obtain the finished product.

[0039] Product testing: Water-soluble organic matter 292g / L, N+P2O5+K2O=46g / L.

[0040] Comparative Example 1 A method for preparing chicken manure water-soluble fertilizer Includes the following steps: S1 Ingredients: Determine the moisture content of fresh chicken manure. Based on the actual moisture content, add water to bring the solid content of the mixture to 20%, and stir to form a slurry. Add sodium humate at 1.5% of the total mass of the slurry, and adjust the pH to 7.2 with sodium hydroxide.

[0041] S2 oxidation: The slurry is introduced into the oxidation reactor, and ozone with a concentration of 90 mg / L is introduced through an annular gas distribution device at a flow rate of 1.0 L / (min). L slurry), control the stirring rate at 220 r / min and the temperature at 42℃, and react for 6 hours.

[0042] S3 solid-liquid separation: S31 Primary Separation: The oxidizing solution is introduced into a disc centrifuge (5 tons / h) and separated at a speed of 3500 r / min (separation factor 1800), and the filtrate is collected; S32 Secondary Separation: The filtrate is introduced into a tubular centrifuge (2 tons / h) and separated at a speed of 9000 r / min (separation factor 9000) to obtain a clear liquid; S4 Photoelectrocatalytic Purification: The clarified liquid is introduced into the UV-hydrogen peroxide coupled reaction device, and hydrogen peroxide with a concentration of 27% is added at 0.4% of the mass of the clarified liquid. The reaction is carried out at a UV wavelength of 254nm for 25 minutes, and then filtered through a 600-mesh filter cloth to obtain purified liquid I. S5 Functional Configuration: S51: Add chitosan-sodium alginate composite-encapsulated trace elements to purified solution I to achieve a total concentration of trace elements of 0.7 g / L, thus obtaining purified solution II.

[0043] The trace elements encapsulated in the chitosan-sodium alginate composite were prepared using the complex coagulation method. The mass ratio of chitosan-sodium alginate to trace elements was 5:1. The mass ratio of chitosan to sodium alginate in the chitosan-sodium alginate was 3:2. The trace elements included calcium nitrate, magnesium sulfate, and zinc sulfate, and the molar ratio of the three was 3:2:1.

[0044] S52: Add 0.3% stigmasterol to purified liquid II, adjust the pH to 6.8, stir well, and obtain the finished product.

[0045] Product testing: Water-soluble organic matter 212g / L, N+P2O5+K2O=33g / L.

[0046] Results analysis: Removing the S22 oxidation shunt significantly reduced water-soluble organic matter and nitrogen, phosphorus and potassium content. The reason is speculated to be that S21 oxidizes faster and more concentratedly than S22, resulting in greater losses. The overall potential intensity of S21 is weaker than that of S22, making deep oxidation and cracking of S22 more suitable.

[0047] Comparative Example 2 A method for preparing chicken manure water-soluble fertilizer Includes the following steps: S1 Ingredients: Determine the moisture content of fresh chicken manure. Based on the actual moisture content, add water to bring the solid content of the mixture to 20%, and stir to form a slurry. Add sodium humate at 1.5% of the total mass of the slurry, and adjust the pH to 7.2 with sodium hydroxide.

[0048] S2 oxidation: Stop the ozone supply, add calcium peroxide at 0.6% of the slurry mass, heat to 52°C, and continue stirring for 6 hours to obtain an oxidized liquid.

[0049] S3 solid-liquid separation: S31 Primary Separation: The oxidizing solution is introduced into a disc centrifuge (5 tons / h) and separated at a speed of 3500 r / min (separation factor 1800), and the filtrate is collected; S32 Secondary Separation: The filtrate is introduced into a tubular centrifuge (2 tons / h) and separated at a speed of 9000 r / min (separation factor 9000) to obtain a clear liquid; S4 Photoelectrocatalytic Purification: The clarified liquid is introduced into the UV-hydrogen peroxide coupled reaction device, and hydrogen peroxide with a concentration of 27% is added at 0.4% of the mass of the clarified liquid. The reaction is carried out at a UV wavelength of 254nm for 25 minutes, and then filtered through a 600-mesh filter cloth to obtain purified liquid I. S5 Functional Configuration: S51: Add chitosan-sodium alginate composite-encapsulated trace elements to purified solution I to achieve a total concentration of trace elements of 0.7 g / L, thus obtaining purified solution II.

[0050] The trace elements encapsulated in the chitosan-sodium alginate composite were prepared using the complex coagulation method, with a mass ratio of chitosan-sodium alginate to trace elements of 5:1; the mass ratio of chitosan to sodium alginate in the chitosan-sodium alginate composite was 3:2; the trace elements included calcium nitrate, magnesium sulfate, and zinc sulfate, with a molar ratio of 3:2:1.

[0051] S52: Add 0.3% phytosterol to purified liquid II, adjust the pH to 6.8, stir well, and obtain the finished product.

[0052] Product testing: Water-soluble organic matter 251g / L, N+P2O5+K2O=39g / L.

[0053] Results Analysis: After removing the S21 oxidation step, the odor of fresh chicken manure was difficult to control for a long time during the experiment, the water-soluble organic matter decreased significantly, and the nitrogen, phosphorus, and potassium contents decreased. It is speculated that S21 plays an indispensable role in the initial decomposition of macromolecules such as cellulose and protein in chicken manure and in the reproduction of harmful microorganisms. Removing S21 affected the oxidative pyrolysis rate, and some substances also failed to be pyrolyzed.

[0054] Comparative Example 3 A method for preparing chicken manure water-soluble fertilizer Includes the following steps: S1 Ingredients: Determine the moisture content of fresh chicken manure. Based on the actual moisture content, add water to bring the solid content of the mixture to 20%, and stir to form a slurry. Add sodium humate at 1.5% of the total mass of the slurry, and adjust the pH to 7.2 with sodium hydroxide.

[0055] S2 segmented oxidation: S21: The slurry is introduced into the oxidation reactor, and ozone with a concentration of 90 mg / L is introduced through the annular gas distribution device at a flow rate of 1.0 L / (min). L slurry), control the stirring speed at 220 r / min and the temperature at 42℃, and react for 2.5 hours.

[0056] S22: Stop the ozone supply, add calcium peroxide at 0.6% of the slurry mass, heat to 52℃, and continue stirring for 3.5 hours to obtain the oxidized liquid.

[0057] S3 solid-liquid separation: S31 Primary Separation: The oxidizing solution is introduced into a disc centrifuge (5 tons / h) and separated at a speed of 3500 r / min (separation factor 1800), and the filtrate is collected; S32 Secondary Separation: The filtrate is introduced into a tubular centrifuge (2 tons / h) and separated at a speed of 9000 r / min (separation factor 9000) to obtain a clear liquid; S4 Functional Configuration: S41: Add chitosan-sodium alginate composite-encapsulated trace elements to purified solution I to achieve a total trace element concentration of 0.7 g / L, thus obtaining purified solution II.

[0058] The trace elements encapsulated in the chitosan-sodium alginate composite were prepared using the complex coagulation method, with a mass ratio of chitosan-sodium alginate to trace elements of 5:1; the mass ratio of chitosan to sodium alginate in the chitosan-sodium alginate composite was 3:2; the trace elements included calcium nitrate, magnesium sulfate, and zinc sulfate, with a molar ratio of 3:2:1.

[0059] S42: Add 0.3% phytosterol to purified liquid II, adjust the pH to 6.8, stir well, and obtain the finished product.

[0060] Product testing: Water-soluble organic matter 265g / L, N+P2O5+K2O=43g / L.

[0061] Results analysis: Removing S4 photoelectrocatalytic purification significantly reduced water-soluble carbon, nitrogen, phosphorus, and potassium. This shows that after the chicken manure pyrolysis liquid underwent prior oxidation treatment, the pyrolysis effect was significantly improved after S4 photoelectrocatalytic purification. Moreover, it does not require a catalyst and will not cause secondary pollution, making it indispensable.

[0062] Experimental Example 1 This invention relates to the determination of the fertilizer efficacy of chicken manure water-soluble fertilizer. (I) Experimental Design 1. Experimental subject: Tomato (variety "Zhongza 105"), a typical economic crop, was selected. It has clear requirements for nitrogen, phosphorus, potassium and trace elements, and stable absorption characteristics, making it suitable for nutrient absorption rate determination.

[0063] 2. Experimental environment: Intelligent greenhouse (temperature 25-28℃ / 18-20℃, light 12h / d, relative humidity 60%-70%), potted plants were used (pot volume 20L, each pot filled with 15kg of sieved loam, soil basic fertility: organic matter 17.2g / kg, total nitrogen 1.05g / kg, available phosphorus 30mg / kg, available potassium 105mg / kg, pH 7.1).

[0064] 3. Experimental Groups: Control group: Apply traditional microbial fermented chicken manure water-soluble fertilizer (traditional microbial product, water-soluble organic matter 175g / L, N+P2O5+K2O=34g / L, calcium 0.6g / L, magnesium 0.4g / L, zinc 0.2g / L, without slow-release coating).

[0065] Treatment 1: Sample from Example 1, water-soluble organic matter 295 g / L, N+P2O5+K2O=48 g / L, calcium 1.2 g / L, magnesium 0.8 g / L, zinc 0.4 g / L.

[0066] Treatment 2: Comparative Example 1 sample, water-soluble organic matter 212 g / L, N+P2O5+K2O=33 g / L.

[0067] Treatment 3: Comparative Example 2 sample, water-soluble organic matter 251 g / L, N+P2O5+K2O=39 g / L.

[0068] Treatment 4: Comparative Example 3 sample, water-soluble organic matter 265 g / L, N+P2O5+K2O=43 g / L.

[0069] Nutrient input control: Each pot in both groups was given 1.2g of pure nitrogen, 0.8g of pure phosphorus (P2O5), and 1.5g of pure potassium (K2O). Micronutrients were matched in proportion to ensure consistent initial nutrient input (equivalent to 103ml for the control group, 76.1ml for treatment 1, and the same amount added for treatments 2 to 5 as treatment 1, to verify the impact of missing parts of the process on the same raw materials); Fertilizer was applied by drip irrigation in 6 even applications (starting 7 days after transplanting, once every 10 days), and all other management measures were exactly the same.

[0070] Sample collection and testing: During the peak fruiting period of tomatoes (60 days after transplanting), 10 potted plants were selected from each group, and samples of the plant (roots, stems, leaves, and fruits) and soil from the pots were collected and sent to the laboratory for testing (available nitrogen was tested according to GB / T42487-2023, available phosphorus according to GB / T12297-2023, available potassium according to NY / T889-2004, available calcium according to NY / T1121.13-2006, available magnesium according to NY / T1121.14-2006, and available zinc according to NY / T890-2004).

[0071] (II) Experimental Results 1. Determination of soil nutrient residue (reflects unabsorbed nutrients; the less residue, the higher the absorption rate). By detecting the content of available nitrogen, available phosphorus, available potassium and available trace elements in the soil, the nutrient residue rate is calculated, which indirectly reflects the crop absorption rate (residue rate = soil residual nutrient content / initial input nutrient content × 100%, absorption rate ≈ 1 - residue rate, ignoring the influence of soil nutrient release).

[0072] Table 1

[0073] Note: The data in the table are the mean ± standard deviation of 10 samples; Treatment 1 is compared with the control group, and Treatments 2 to 4 are compared with Treatment 1.

[0074] Treatment 1 (complete patented process) reduced the residual rate of various nutrients by more than 39.03% compared with the traditional process, and the corresponding absorption rate increased by more than 39.03%, which is significantly higher than the conclusion threshold of "30%". Due to the lack of certain processing techniques, the residual rates of various nutrients in treatments 2, 3, and 4 increased by more than 11.71% compared to treatment 1, and the corresponding absorption rates decreased by more than 11.71%.

[0075] 2. Plant nutrient accumulation test (directly reflects the total amount of nutrients absorbed by the crop) By measuring the nutrient accumulation of the entire tomato plant (roots + stems + leaves + fruits), the total nutrient absorption is calculated, and the nutrient absorption capacity of the two groups of crops is directly compared (the higher the total absorption, the higher the absorption rate).

[0076] Table 2

[0077] Note: Treatment 1 in the table uses the control group as a reference, and Treatments 2 through 4 use Treatment 1 as a reference. Plant nutrient accumulation = Nutrient content of each plant organ × Fresh weight of the corresponding organ. Tests showed that the accumulation of nitrogen, phosphorus, potassium, and trace elements in individual plants in the experimental group was more than 29.45% higher than that in the control group, which is completely consistent with the conclusion that "crop absorption rate increased by more than 29.45%", and the difference was significant (P < 0.05).

[0078] 3. Isotope tracing experiment (precisely tracking the absorption process of specific nutrients) To further verify the absorption rate more accurately, nitrogen (the macronutrient most needed by crops) was selected for isotope tracing experiments, using... 15 N-labeled urea was added to two groups of water-soluble fertilizers (label abundance 10%), and the levels of urea in the plants were measured. 15 The abundance of N is used to calculate nitrogen utilization rate (i.e. nitrogen absorption rate).

[0079] Table 3

[0080] Note: Treatment 1 in the table uses the control group as a reference, and Treatments 2 through 4 use Treatment 1 as a reference. Nitrogen use efficiency = (Nuclear energy content in plant tissues) 15 Total nitrogen content / fertilizer input 15 The nitrogen utilization rate of the treatment was 41.3%, compared to 32.5% in the control group, representing a 27.08% increase in absorption rate. Furthermore, more nitrogen (63.8%) was distributed to the fruit, further demonstrating that the product of this invention not only improves nutrient absorption rate but also optimizes nutrient distribution within the crop, which is more conducive to yield and quality formation.

[0081] Experiment Example 2 Comparison of the effects of segmented oxidation and ozone oxidation in this invention: (I) Experimental Design 1. Materials Example 1: Chicken manure slurry obtained in step S1.

[0082] 2. Equipment Ozone generator: Ozone output is adjustable.

[0083] Reaction vessel: Equipped with good sealing and stirring capabilities.

[0084] Testing instruments include turbidity meters, suspended solids measuring devices, total organic carbon (TOC) analyzers, and Fourier transform infrared spectrometers (FTIR).

[0085] 3. Methods (1) Group design and operation: Segmented oxidation group: The operation method is the same as that of segmented oxidation in Example 1 S2.

[0086] Ozone oxidation group: Ozone (concentration set at 90 mg / L) was introduced into the chicken manure slurry obtained in step S1 of Example 1, and the reaction was carried out at 42°C for 6 hours.

[0087] (2) Detection indicators: Turbidity and suspended solids content of oxidized slurry: reflect the dispersion and removal of solid particles.

[0088] Total organic carbon (TOC) content: measures the degree of oxidative decomposition of organic matter.

[0089] Functional group changes: FTIR analysis was used to analyze the changes in the functional groups of organic compounds before and after oxidation, to understand the impact of oxidation reactions on the structure of organic compounds.

[0090] Subsequent solid-liquid separation effect: Using the same centrifugation conditions (e.g., disc centrifuge, speed 3500 r / min, separation factor 1800), the turbidity and suspended solids content of the separated liquid were measured to evaluate the impact of the oxidation process on subsequent solid-liquid separation.

[0091] (II) Experimental Results 1. Slurry characteristics Table 4

[0092] The data in the table show that the turbidity and suspended solids content of the slurry after staged oxidation are lower, indicating that staged oxidation can more effectively promote the coagulation or decomposition of solid particles and reduce suspended impurities in the system. At the same time, the TOC content decreases more significantly after staged oxidation, indicating a higher degree of oxidative decomposition of organic matter.

[0093] 2. Changes in the functional groups of organic compounds FTIR analysis revealed that ozone oxidation altered some functional groups in the organic matter of chicken manure, such as hydroxyl (-OH) and carbonyl (C=O) groups, but the overall structure remained relatively complex. However, after staged oxidation, in addition to more significant changes in hydroxyl and carbonyl functional groups, some new, relatively simple functional group structures emerged. This indicates that subsequent oxidation by calcium peroxide further disrupted the complex structure of the organic matter, transforming it into a simpler, more easily degradable form.

[0094] 3. Subsequent solid-liquid separation effect Table 5

[0095] The data in the table show that, under the same centrifugation conditions, the turbidity and suspended solids content of the liquid after centrifugation following staged oxidation were significantly lower than those in the ozone oxidation group. This indicates that the staged oxidation process can significantly improve the subsequent solid-liquid separation effect, resulting in a clearer liquid, which is beneficial to improving the quality of chicken manure water-soluble fertilizer.

[0096] Experimental Example 3 Advantages of the solid-liquid separation stage of this invention compared to existing technologies: Using the oxidized liquid obtained in step S22 of Example 1 as material (while only changing the solid content in the S1 batching step of Example 1 to 10% and 30% as a control, the material amount of each treatment group was 30 cubic meters), the effect of the solid-liquid separation system of the present invention on the prior art membrane separation system was examined.

[0097] Table 6

[0098] (I) Experimental Design 1. Variable Design Independent variables: type of separation technology (two-stage mechanical separation, membrane separation), solid content of material (10%, 20%, 30%); Dependent variables: separation efficiency (core functional indicator), maintenance cost (economic indicator), and antifouling performance (stability indicator, including membrane flux decay rate and efficiency fluctuation value). Control variables: Basic material properties: Oxidation solution prepared in step S22 of Example 1; Operating parameters: Both types of equipment are operated at their rated throughput (mechanical separation 8 m³ / h, membrane separation 0.8 m³ / h, with matching membrane area design), with the operating temperature controlled at 25±2℃ and the inlet and outlet pressures stable within the equipment design range; Testing frequency: Separation efficiency is tested once every 24 hours, membrane flux is recorded once every 2 hours, and equipment maintenance operations (cleaning, consumable replacement) are performed according to standard procedures and costs are recorded.

[0099] 2. Experimental Grouping and Cycle Table 7

[0100] 3. Cost accounting design The cost structure of the two technologies is calculated separately, using a period of "3 months of continuous operation of a single set of equipment": Two-stage mechanical separation cost: Wear parts (bearings, seals) are replaced once every 1.5 years (as recommended in the equipment manual), and cleaning is carried out once a month (based on the internal residue of the equipment to ensure no solid buildup). Membrane separation cost: Membrane modules are replaced every 2 months (manufacturer's recommended lifespan, verified by the fouling situation in the experiment), and cleaning is carried out twice a week (adjusted according to the membrane flux decay to ensure that the flux is not lower than 60% of the initial value). Extreme scenario simulation: Artificially increase the level of material contamination (add 5% fine particles with a particle size of 0.1-1μm), record the changes in membrane module lifespan, and calculate the cost under extreme scenarios.

[0101] (II) Experimental Methods 1. Material preparation method Prepare a quantity of fresh chicken manure and dried chicken manure powder, test the moisture content, and calculate and mix them into a mixture with a solid content of 10%, 20%, and 30% in the mixing tank. Turn on the variable frequency stirrer (200 r / min) and stir for 30 minutes to ensure that the solid particles are evenly dispersed and there is no agglomeration. The solid content of the suspension is tested using a solid content analyzer, and the error must be controlled within ±0.5%. If the standard is not met, the amount of solid or liquid is adjusted until the requirement is met.

[0102] 2. Separation efficiency test method Sampling: Sampling ports are set at the inlet and outlet of the separation equipment. Each sampling volume is 500 mL. Before sampling, the sampling tube is rinsed 3 times with the sample solution to avoid residual contamination. Solid content detection: Pour the sample into a pre-weighed weighing dish, place it in a solid content analyzer (temperature 105℃, dried to constant weight), record the mass before and after drying, and calculate the solid content using the formula: Solid content (%) = (mass after drying - mass of weighing dish) / (mass of sample) × 100% Separation efficiency calculation: Calculate the separation efficiency according to the formula, and take the average of 3 parallel samples for each experiment: Separation efficiency (%) = (Inlet solids content - Outlet solids content) / Inlet solids content × 100% 3. Anti-pollution performance test method (1) Mechanical separation efficiency fluctuation test: Initial efficiency record: On the first day of the experiment, record the initial efficiency according to the "Separation Efficiency Test Method"; Long-term monitoring: Separation efficiency was repeatedly tested on day 30 and day 60 of operation, and efficiency fluctuation values ​​were calculated. Efficiency fluctuation (%) = Initial efficiency - Current efficiency During this period, the equipment operating parameters remained stable, and no additional maintenance operations were required (except for routine cleaning).

[0103] (2) Membrane separation flux test: Initial flux calibration: Before the experiment, test the membrane flux with deionized water and adjust it to 100 L / h (standard conditions: 25℃, 0.2 MPa). Continuous monitoring: During operation, the membrane flux is recorded every 2 hours using a flow meter, and the flux decay rate is calculated. Flux decay rate (%) = (Initial flux - Current flux) / Initial flux × 100% Period: Continuous monitoring for 15 days, recording the average flux and attenuation rate each day.

[0104] 4. Maintenance Operation and Cost Recording Methods (1) Cleaning operation: Two-stage mechanical separation: The machine is shut down once a month to rinse the inside of the equipment (drum of disc centrifuge and separation chamber of tubular centrifuge) with a neutral degreasing agent, and then rinsed with clean water until the pH is neutral. Record the amount of cleaning agent used, water and electricity costs, and labor time, and calculate the cost of a single cleaning.

[0105] Membrane separation: The machine is shut down twice a week for 30 minutes of 3-5% NaOH solution circulation cleaning (flow rate consistent with the running time). The cleaning agent usage and manual time are recorded, and the cost of a single cleaning is calculated. (2) Consumable replacement procedure: Two-stage mechanical separation: The average monthly cost of vulnerable parts is calculated over a 1.5-year period (the cost of replacing a bearing or seal once is 7,000 yuan, which is amortized to each month). Membrane separation: Replace the entire membrane module every 2 months (or when the membrane flux decays to less than 50% of the initial value), and record the replacement time and membrane module purchase cost; (3) Cost accounting: Summarize the cleaning cost and consumable replacement cost each month, calculate the average monthly total cost and the total cost over 3 months, and compare the cost differences between the two types of technologies.

[0106] (III) Experimental Results Table 8 Separation efficiency data

[0107] As can be seen from the table, the membrane separation efficiency decreases with the extension of the operating time, while the two-stage mechanical separation efficiency of the present invention remains unchanged.

[0108] Table 9 Operating Costs (Single Unit, 3 Months of Operation)

[0109] As can be seen from the table, the cost reduction of the two-stage mechanical separation of the present invention is 93.5%. In extreme scenarios, due to the high degree of material contamination, membrane cleaning is more frequent, the membrane life is shortened to 1 month, and the total cost of membrane separation for 3 months will be even higher, with a cost reduction of more than 93.5%.

[0110] Experiment Example 4 The composite encapsulation technology of this invention improves product stability: 1. Using the purified solution I obtained in step S4 of Example 1 of this invention, two parallel samples were dispensed, each with a total volume of 10 L, into 500 mL transparent sealed polyethylene bottles (20 bottles per group). Subsequent processing was as follows: Table 10

[0111] 2. Storage Condition Settings To simulate the storage environment in actual agricultural production, three storage conditions were set up, and six bottles of each sample were placed under each condition (two bottles were reserved for initial testing): Normal temperature conditions: 25±2℃, protected from light (simulating normal temperature storage in a warehouse); High temperature conditions: 40±2℃, protected from light (simulating open-air storage or transportation in summer); Temperature fluctuation conditions: 10℃ (night) - 35℃ (day) cycle, fluctuating once a day (simulating an outdoor environment with large temperature difference between day and night).

[0112] 3. Detection Indicators and Methods Samples were taken and tested at day 0 (initial storage), 1 month, 2 months, 3 months, 4 months, 5 months, and 6 months of storage. The core indicators and testing methods are as follows: Table 11

[0113] 4. Experimental Results (1) Stratification rate change data (unit: %) Table 12

[0114] The results above show that the stratification rate of the experimental group (wrapped group) was ≤1.2% under all storage conditions within 6 months, far below the "no obvious stratification" criterion (≤5%), and the stratification rate increased slowly over time, with no obvious stratification phenomenon. In contrast, the control group (unwrapped group) showed obvious stratification after 1 month, and the stratification rate reached 38.5% under normal temperature conditions and exceeded 45% under high temperature and temperature fluctuation conditions after 6 months, classifying it as "severe stratification" and failing to meet storage requirements.

[0115] (2) Data on changes in precipitation amount (unit: g / 50mL) Table 13

[0116] The results above show that the experimental group (encapsulated group) had a precipitation amount ≤0.09g / 50mL under all storage conditions within 6 months, meeting the criteria for "no obvious precipitation" (≤0.1g / 50mL), and the precipitation increase was extremely slow, with no visible precipitation observed by the naked eye. In contrast, the control group (unencapsulated group): after 3 months, the precipitation amount exceeded 0.5g / 50mL (0.58g / 50mL at room temperature), and reached 1.82g / 50mL under high temperature conditions after 6 months, with obvious precipitation and clumping, severely affecting product uniformity.

[0117] (3) Data on the changes in the retention rate of trace elements (taking calcium as an example, magnesium and zinc show the same trend, unit: %) Table 14

[0118] The results above show that the experimental group (coated group) maintained a calcium retention rate of ≥91.8% (magnesium and zinc retention rates of ≥92.2% and 92.5%, respectively) under all storage conditions within 6 months, meeting the "stable" criterion (≥90%). This indicates that the composite coating effectively prevented the complexation and precipitation of trace elements with organic matter, reducing nutrient loss. In contrast, the control group (uncoated group) maintained a calcium retention rate of only 77.2% (magnesium and zinc of 76.5% and 75.8%, respectively) at room temperature after 6 months, which is below the "unstable" threshold (80%). This is mainly because the free trace elements reacted with organic acids and humic substances in the water-soluble fertilizer, forming precipitates and leading to a decrease in retention rate.

[0119] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0120] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing water-soluble chicken manure fertilizer based on liquid-phase segmented oxidation-mechanical separation technology, characterized in that, Including the following steps: S1 Ingredients: Determine the moisture content of fresh chicken manure, add water according to the actual moisture content to make the solid content in the mixture reach 20%, and stir into a slurry; add sodium humate at 1-2% of the slurry mass, and adjust the pH to 7.0-7.5 with sodium hydroxide; S2 segmented oxidation: S21: The slurry is introduced into the oxidation reactor, and ozone at a concentration of 80-100 mg / L is introduced through an annular gas distribution device at a flow rate of 0.8-1.2 L / (min). L slurry), control the stirring speed at 200-250 r / min, the temperature at 40-45℃, and react for 2-3 hours; S22: Stop the ozone supply, add calcium peroxide at 0.5-0.8% of the slurry mass, heat to 50-55℃, and continue stirring for 3-4 hours to obtain an oxidized liquid; S3 solid-liquid separation: S31 Primary Separation: The oxidizing solution is introduced into a disc centrifuge and separated at a speed of 3000-4000 r / min and a separation factor of 1500-2000. The filtrate is then collected. S32 Secondary Separation: The filtrate is introduced into a tubular centrifuge and separated at a speed of 8000-10000 r / min and a separation factor of 8000-10000 to obtain a clear liquid; S4 Photoelectrocatalytic Purification: The clarified liquid is introduced into an ultraviolet-hydrogen peroxide coupled reaction device, and hydrogen peroxide with a concentration of 27% is added at a mass of 0.3-0.5% of the clarified liquid. The reaction is carried out at an ultraviolet wavelength of 254nm for 20-30 minutes. After filtration through a 500-800 mesh filter cloth, purified liquid I is obtained. S5 Functional Configuration: S51: Add chitosan-sodium alginate composite-encapsulated trace elements to purified liquid I to achieve a total concentration of trace elements of 0.5-1 g / L, thus obtaining purified liquid II; Among them, the trace elements encapsulated by chitosan-sodium alginate are prepared by complex coagulation method, and the mass ratio of chitosan-sodium alginate to trace elements is (4-6):1; the mass ratio of chitosan to sodium alginate in chitosan-sodium alginate is 3:2; the trace elements include calcium nitrate, magnesium sulfate and zinc sulfate, and the molar ratio of the three is 3:2:

1. S52: Add 0.2-0.4% phytosterol to the purified liquid II, adjust the pH to 5.6-7.0, stir well, and obtain the finished product.

2. The method for preparing chicken manure water-soluble fertilizer according to claim 1, characterized in that, In the S1 batching, sodium humate is added at a rate of 1.5% of the slurry mass, and the pH is adjusted to 7.2 with sodium hydroxide.

3. The method for preparing chicken manure water-soluble fertilizer according to claim 1, characterized in that, In the S2 segmented oxidation process S21: The slurry is introduced into the oxidation reactor, and ozone with a concentration of 90 mg / L is introduced through the annular gas distribution device at a flow rate of 1.0 L / (min). L slurry), control the stirring speed at 220 r / min, the temperature at 42℃, and react for 2.5 hours; S22: Stop the ozone supply, add calcium peroxide at 0.6% of the slurry mass, heat to 52℃, and continue stirring for 3.5 hours to obtain the oxidized liquid.

4. The method for preparing chicken manure water-soluble fertilizer according to claim 1, characterized in that, In the S3 solid-liquid separation process S31 Primary separation: The oxidizing solution is introduced into a disc centrifuge and separated at a speed of 3500 r / min and a separation factor of 1800. The filtrate is then collected. S32 Secondary Separation: The filtrate is introduced into a tubular centrifuge and separated at a speed of 9000 r / min and a separation factor of 9000 to obtain a clear liquid.

5. The method for preparing chicken manure water-soluble fertilizer according to claim 1, characterized in that, In the S4 photoelectrocatalytic purification process, the clarified liquid is introduced into an ultraviolet-hydrogen peroxide coupled reaction device, and hydrogen peroxide with a concentration of 27% is added, accounting for 0.4% of the mass of the clarified liquid. The reaction is carried out at an ultraviolet wavelength of 254nm for 25 minutes, and then filtered through a 600-mesh filter cloth to obtain purified liquid I.

6. The method for preparing chicken manure water-soluble fertilizer according to claim 1, characterized in that, In the S5 functional configuration, S51: Add chitosan-sodium alginate composite-encapsulated trace elements to purified solution I to achieve a total concentration of trace elements of 0.7 g / L, thus obtaining purified solution II; The trace elements encapsulated in the chitosan-sodium alginate composite were prepared using the complex coagulation method. The mass ratio of chitosan-sodium alginate to trace elements was 5:

1. The mass ratio of chitosan to sodium alginate in the chitosan-sodium alginate was 3:

2. The trace elements included calcium nitrate, magnesium sulfate, and zinc sulfate, and the molar ratio of the three was 3:2:

1. S52: Add 0.3% phytosterol to purified liquid II, adjust the pH to 6.8, stir well, and obtain the finished product.

7. The chicken manure water-soluble fertilizer prepared by any one of the preparation methods described in claims 1-6.

8. The product prepared by any of the preparation methods described in claims 1-6 or the application of the chicken manure water-soluble fertilizer described in claim 6 in agricultural production.

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