Method for preparing granular biogas residue soil conditioner for feeding machine

Abstract

The invention discloses a method for preparing a granular biogas residue soil conditioner for both a feeding machine and a machine, which comprises 90-100 parts of biogas residue with the water content of 3-5% after dry-wet separation, 5-10 parts of an acid regulating agent, 3-5 parts of a binder, 20-30 parts of turf, 15-25 parts of perlite, 5-8 parts of mineral fertilizer, 2-4 parts of trace elements and 1-2 parts of sophorolipid with the concentration of 3% and used as a wetting agent. An acid regulating agent, a binding agent, trace elements and the like are scientifically proportioned, the acid regulating agent is formed by mixing vinegar residues and furfural residues according to a specific proportion according to different soil types and can be flexibly adjusted according to the soil acidity and alkalinity difference, and the binding agent is formed by mixing konjac polysaccharide and modified chitosan according to a certain proportion and is stable in binding performance in a humid environment; the forming effect of the modifier particles is remarkably improved, the modifier particles are not prone to being damped and broken in the storage process, the modifier particles can be evenly scattered in the field application process, it is guaranteed that the modifier makes full contact with soil, and therefore the soil improvement effect is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of soil and fertilizer technology, specifically relating to a method for preparing granular biogas residue soil conditioner for both feed and machinery use. Background Technology

[0002] Soil, as the foundation of agricultural production, directly affects the yield and quality of crops. In recent years, affected by factors such as unreasonable fertilization, over-cultivation, and environmental pollution, soil degradation has become increasingly severe globally, including soil acidification, compaction, and declining fertility, seriously hindering the sustainable development of agriculture. Biogas residue, as a solid residue from the anaerobic fermentation of organic matter, is rich in organic matter, humic acid, macroelements such as nitrogen, phosphorus, and potassium, as well as various trace elements such as zinc and iron. It also contains various amino acids, enzymes, and beneficial microbial communities. These components endow biogas residue with many soil-improving properties. Therefore, developing biogas residue into a soil conditioner can not only realize the resource utilization of waste and reduce environmental pressure, but also provide a green and sustainable solution for soil improvement, with significant ecological and economic benefits.

[0003] In the current raw material processing stage of preparing soil conditioners using biogas residue, traditional technologies are mostly limited to simply mixing a few common materials, lacking a scientific ratio of auxiliary functional materials such as acidifiers, binders, and trace elements. The use of acidifiers often does not fully consider the differences in pH among different soil types. For example, in acidic red soil areas, some conditioners use acidifiers that are too weak or insufficient in amount, failing to effectively neutralize soil acidity. In saline-alkali soil areas, improper selection of acidifiers may exacerbate soil salinization. Furthermore, some conditioners use ordinary starch-based binders, whose binding performance decreases significantly in humid environments, resulting in poor granulation of the conditioner. These binders are prone to moisture absorption and breakage during storage, making it difficult to spread evenly in the field and affecting the improvement effect. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing granular biogas residue soil conditioner for both feed and machinery use, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a granular biogas residue soil conditioner for both feed and machinery preparation, comprising:

[0006] 90-100 parts of biogas residue with a moisture content of 3-5% after dry-wet separation, 5-10 parts of acidifier, 3-5 parts of binder, 20-30 parts of peat, 15-25 parts of perlite, 5-8 parts of mineral fertilizer, 2-4 parts of trace elements, and 1-2 parts of sophorolipid at a concentration of 3% used as a wetting agent.

[0007] Preferably, by weight, it includes 95 parts of biogas residue with a moisture content of 4% after dry-wet separation, 8 parts of acidifier, 4 parts of binder, 25 parts of peat, 20 parts of perlite, 7 parts of mineral fertilizer, 3 parts of trace elements, and 1.5 parts of sophorolipid at a concentration of 3% as a wetting agent.

[0008] Preferably, the acidifier is a mixture of vinegar residue and furfural residue in a 1:2 ratio, and the binder is a mixture of konjac polysaccharide and modified chitosan in a 1:1.5 ratio.

[0009] Preferably, the mineral fertilizer is calcium or magnesium, the trace element is zinc or iron, the konjac polysaccharide is obtained from konjac by water extraction and alcohol precipitation, followed by purification steps such as deproteinization and decolorization, and the modified chitosan is obtained by carboxymethylation modification of chitosan to enhance its binding properties.

[0010] A method for preparing granular biogas residue soil conditioner for both feed and machinery use includes the following steps:

[0011] S1. After removing impurities, the biogas residue is separated into biogas liquid by a dry-wet separator. The biogas residue is turned over and dried until the moisture content reaches 4%. The biogas residue, wetting agent, and binder are added to the mixer in proportion and mixed thoroughly.

[0012] S2. Then add peat moss, perlite, mineral fertilizer, trace elements, and sophoryl ester to the mixer and mix it evenly with the biogas residue.

[0013] S3. After uniform mixing, the mixture is taken out from the mixer and conveyed to the granulation mold. During the granulation process, the mixture is pressed into cylindrical particles with a diameter of 3-5mm by the extrusion action of the mold.

[0014] S4. When using the warm air drying method, hot air is sent into the drying chamber by a fan to reduce the moisture content of the particles to 8-10%. When using the flat-bottom drying method, the particles are evenly spread on a clean cement floor or plastic film and dried in sunny weather, turning them 2-3 times a day. The dried particles are then sieved through a double-layer screen with apertures of 2.5-3.5mm and 3.5-5.5mm to remove unqualified particles with a diameter less than 2.5mm and greater than 5.5mm.

[0015] S5. After drying, the granules are packaged in small-mouthed bags. Granular soil conditioners are sealed in sealed bags.

[0016] Preferably, in steps S1 and S2, the mixing time is 15-20 minutes to ensure that all materials are mixed evenly.

[0017] Preferably, in steps S1 and S2, the rotation speed is controlled at 100-150 rpm during material mixing.

[0018] Preferably, in step S4, the drying temperature is controlled at 60-80℃ and the drying time is 30-60 minutes. During the drying process, the moisture content of the particles is detected every 10 minutes, and the hot air temperature and flow rate are adjusted in a timely manner according to the change in moisture content. If flat-bottom drying is used, the drying time is no less than 2 days.

[0019] Preferably, the surface of the mixer in steps S1 and S2 is provided with a vibration motor, the bottom of the mixer is connected to a frame, and several dampers are connected between the frame and the mixer.

[0020] Preferably, a servo motor is connected to the bottom of the mixer, and the output shaft of the servo motor rotates through the mixer and connects to the rotating block. A stirring rod is connected to the surface of the rotating block, and a pressure roller is rotatably connected to the stirring rod through a bearing.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] (1) By using biogas residue as the core raw material, and using agricultural organic wastes such as vinegar residue and furfural residue as acidifiers, and using raw materials such as konjac polysaccharide and modified chitosan to prepare binders, the efficient utilization of various organic wastes has been achieved, realizing the dual goals of waste resource utilization and ecological environmental protection.

[0023] (2) In terms of raw material ratio, by scientifically ratioing acidifiers, binders, trace elements, etc., compared with the traditional technology of simply mixing several common materials, it can more accurately meet the needs of soil improvement. For different soil types, the acidifier is made by mixing vinegar residue and furfural residue in a specific ratio, which can be flexibly adjusted according to the difference in soil pH. It effectively solves the problems of insufficient alkalinity or insufficient addition of acidifiers in acidic red soil areas and the problem of improper selection of acidifiers in saline-alkali soil areas aggravating soil salinization. It improves the effectiveness of pH adjustment for various types of soil and creates a more suitable soil environment for crop growth.

[0024] (3) The binder is a mixture of konjac polysaccharide and modified chitosan in a certain proportion. Compared with ordinary starch binders, it has stable bonding performance in a humid environment, which significantly improves the molding effect of the modifier particles. The modifier particles are not easily damp and broken during storage. When applied in the field, they can be evenly spread, ensuring that the modifier is in full contact with the soil, thereby effectively improving the soil improvement effect and reducing the situation of low soil improvement efficiency caused by problems in the application of the modifier.

[0025] (4) A vibration motor is installed on the surface of the mixer, and a frame is connected to the bottom with a damper. A servo motor is also connected to the bottom of the mixer. The surface of the rotating block is connected to the stirring rod, and the stirring rod is connected to the pressure roller through the bearing. This makes the stirring process more efficient and the material mixing more uniform. At the same time, while the stirring rod stirs the material, the pressure roller can also roll the material. The rolling action of the pressure roller applies pressure to the material, which can break up the lumps in the material, crush the large particles, and promote the mutual penetration and filling of gaps of different materials under pressure. This effectively improves the uniformity of material mixing and avoids the occurrence of uneven local components. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the electron microscope structure of the biogas residue of the present invention;

[0027] Figure 2 This is a diagram illustrating the effect of applying the soil amendment particles of this invention into the soil;

[0028] Figure 3 These are diagrams illustrating the effects of applying the amendment particles of this invention to different types of soil.

[0029] Figure 4 This diagram illustrates the effect of applying different amounts of biogas residue-based soil conditioner on the plant height, stem diameter, and chlorophyll content of dryland maize.

[0030] Figure 5 This diagram illustrates the effect of applying different amounts of biogas residue-based soil conditioner on the plant height of maize during the growing season in dryland areas.

[0031] Figure 6 This diagram illustrates the effect of applying different amounts of biogas residue-based soil conditioner on the yield of corn in dryland areas according to the present invention.

[0032] Figure 7 This diagram illustrates the effect of applying different amounts of biogas residue-based soil conditioner on soil compaction according to the present invention.

[0033] Figure 8 This diagram illustrates the effect of applying different amounts of biogas residue-based soil conditioner on soil bulk density and soil moisture content according to the present invention.

[0034] Figure 9 This diagram illustrates the effect of applying different amounts of biogas residue-based soil conditioner on soil moisture content according to the present invention.

[0035] Figure 10 This diagram illustrates the effect of applying different amounts of biogas residue-based soil conditioner on soil organic matter content according to the present invention.

[0036] Figure 11 This is an illustration of the effect of sealing and packaging granular soil conditioner with the sealing bag of the present invention;

[0037] Figure 12 This is a schematic diagram of the mixer of the present invention;

[0038] Figure 13 This is a top view of the mixer of the present invention.

[0039] In the diagram: 1. Mixer; 2. Vibration motor; 3. Frame; 4. Damper; 5. Servo motor; 6. Rotating block; 7. Mixing rod; 8. Pressure roller. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0042] This invention provides, for example Figure 1-13 The invention described is a granular biogas residue soil conditioner for both feed and machinery preparation, comprising:

[0043] 90-100 parts of biogas residue with a moisture content of 3-5% after dry-wet separation, 5-10 parts of acidifier, 3-5 parts of binder, 20-30 parts of peat, 15-25 parts of perlite, 5-8 parts of mineral fertilizer, 2-4 parts of trace elements, and 1-2 parts of sophorolipid at a concentration of 3% used as a wetting agent.

[0044] By weight, it includes 95 parts of biogas residue with a moisture content of 4% after dry-wet separation, 8 parts of acidifier, 4 parts of binder, 25 parts of peat, 20 parts of perlite, 7 parts of mineral fertilizer, 3 parts of trace elements, and 1.5 parts of 3% sophorolipid as a wetting agent.

[0045] The acidifier is a mixture of vinegar residue and furfural residue in a 1:2 ratio, and the binder is a mixture of konjac polysaccharide and modified chitosan in a 1:1.5 ratio.

[0046] The mineral fertilizer is calcium or magnesium, the trace element is zinc or iron, the konjac polysaccharide is extracted from konjac by water extraction and alcohol precipitation, and then purified by deproteinization, decolorization and other purification steps. The modified chitosan is modified by carboxymethylation of chitosan to enhance its binding properties.

[0047] A method for preparing granular biogas residue soil conditioner for both feed and machinery use includes the following steps:

[0048] S1. After removing impurities, the biogas residue is separated into biogas liquid by a dry-wet separator. The biogas residue is turned over and dried until the moisture content reaches 4%. The biogas residue, wetting agent, and binder are added to mixer 1 in proportion and mixed thoroughly.

[0049] S2. Then add peat moss, perlite, mineral fertilizer, trace elements, and sophoryl ester to mixer 1 and mix it evenly with biogas residue.

[0050] S3. After uniform mixing, the mixture is taken out from the mixer 1 and conveyed to the granulation mold. During the granulation process, the mixture is pressed into cylindrical particles with a diameter of 3-5mm by the extrusion action of the mold.

[0051] S4. When using the warm air drying method, hot air is sent into the drying chamber by a fan to reduce the moisture content of the particles to 8-10%. When using the flat-bottom drying method, the particles are evenly spread on a clean cement floor or plastic film and dried in sunny weather, turning them 2-3 times a day. The dried particles are then sieved through a double-layer screen with apertures of 2.5-3.5mm and 3.5-5.5mm to remove unqualified particles with a diameter less than 2.5mm and greater than 5.5mm.

[0052] S5. After drying, the granules are packaged in small-mouthed bags. Granular soil conditioners are sealed in sealed bags.

[0053] In steps S1 and S2, the mixing time for the materials is 15-20 minutes, and during the mixing process, it is ensured that all materials are mixed evenly.

[0054] In steps S1 and S2, the rotation speed is controlled at 100-150 rpm during material mixing.

[0055] In step S4, the drying temperature is controlled at 60-80℃ and the drying time is 30-60 minutes. During the drying process, the moisture content of the particles is checked every 10 minutes, and the hot air temperature and flow rate are adjusted in time according to the change in moisture content. If flat drying is used, the drying time is no less than 2 days.

[0056] In steps S1 and S2, the surface of the mixer 1 is equipped with a vibration motor 2. A frame 3 is connected to the bottom of the mixer 1, and several dampers 4 are connected between the frame 3 and the mixer 1. A servo motor 5 is connected to the bottom of the mixer 1, and the output shaft of the servo motor 5 rotates through the mixer 1 and connects to a rotating block 6. A stirring rod 7 is connected to the surface of the rotating block 6, and a pressure roller 8 is rotatably connected to the stirring rod 7 via a sealed bearing. The vibration motor 2 on the surface of the mixer 1 generates high-frequency micro-amplitude vibrations, which can reduce the friction between materials, enhance material flowability, and make the materials easier to be driven by the stirring rod 7 during the mixing process. This, combined with the mechanical stirring motion of the mixer 1, greatly improves the mixing uniformity and efficiency, and prevents material lumps. The mixing may be uneven or partially uneven. The frame 3 provides a stable support for the mixer 1 and is fixed to the foundation with anchor bolts. It can withstand the gravity, inertial force and vibration force generated by the operation of the mixer 1, ensuring stable operation of the equipment. At the same time, the damper 4 is installed between the frame 3 and the mixer 1, which can effectively absorb the vibration energy transmitted by the vibration motor 2, reduce the overall vibration amplitude of the equipment, reduce equipment wear and noise, and extend service life. The servo motor 5 controls the speed and angle of the rotating block 6 and the mixing rod 7, ensuring the mixing force and speed of the material. The pressure roller 8 on the mixing rod 7 moderately crushes the material during the mixing process, which helps to further break up the lumpy material, ensuring the efficient, stable and high-quality preparation of the soil conditioner mixture.

[0057] Example

[0058] Target users: large-scale planting bases, agricultural cooperatives and professional growers. These groups have the means to apply the ammunition, can accurately control the amount applied, and can give full play to the advantage of uniform spreading of granular amendments.

[0059] Raw material characteristics and proportions:

[0060] Biogas residue: Taken from biogas digesters with cow dung and chicken manure as the main fermentation raw materials, after dry and wet separation, the moisture content is reduced to 4%. At this time, the biogas residue is loose and powdery, with a pH value of about 7.2 and an organic matter content of ≥35%. It is necessary to use a combination of vibrating screen and manual sorting to thoroughly remove impurities such as gravel and plastic.

[0061] Acidifier: Mix vinegar residue (strong acidity, pH about 3.5-4.5) and furfural residue (pH about 3.0-4.0) in a 1:2 ratio to slowly release acidic substances and adjust soil pH.

[0062] Binder: Konjac polysaccharide and modified chitosan are mixed in a 1:1.5 ratio. The former has good film-forming properties, while the latter can enhance the mechanical strength of the particles. Both need to be ground into 200-mesh fine powder in advance for use.

[0063] Other raw materials: peat moss is selected from high-altitude peat moss in Northeast China with an organic matter content of >50%; perlite particle size is 2-3mm; mineral fertilizer is a calcium-magnesium mixture (calcium-magnesium ratio 3:2); trace elements are selected from zinc-iron chelates that are easily soluble in water.

[0064] Detailed preparation steps:

[0065] Pretreatment of biogas residue: A horizontal screw discharge sedimentation centrifuge is used for dry and wet separation. The horizontal screw discharge sedimentation centrifuge can break the fibrous entanglement structure in the biogas residue, making the moisture distribution more uniform. At the same time, the porosity of the material is adjusted by mechanical extrusion, reducing the exposure of hydrophobic groups, thereby increasing the water absorption rate of the treated biogas residue particles, so that they can play a faster role in soil improvement after being mixed with soil. The separation parameters of the horizontal screw discharge sedimentation centrifuge are set with a speed of 3000 r / min and a separation time of 15 minutes. The separated biogas residue is spread evenly on the hardened site with a thickness of no more than 10 cm. It is turned over twice a day, morning and evening, and monitored in real time using a temperature and humidity recorder. When the moisture content is stable at 4%, it is transferred to the next stage.

[0066] Mixing stage: Using mixer 1, first add biogas residue, 3% sophorolipid wetting agent and binder to mixer 1, turn on vibrating motor 2 (frequency 50Hz), and servo motor 5 mixes the materials at a speed of 120 rpm. When the servo motor 5 is working, it can drive the rotating block 6 to rotate. The rotating block 6 drives the stirring rod 7 to stir and mix the materials. At the same time, the stirring rod 7 can drive the pressure roller 8 to rotate and roll the materials. The rolling action applies pressure to the materials, which can break up the lumps in the materials, crush large particles, and improve the mixing uniformity of the materials.

[0067] Granulation and molding: The uniformly mixed material is granulated using a ring die granulator with a die diameter of 4mm and a compression ratio of 1:6. The screw speed is adjusted to 80r / min by a frequency converter, and the die pressure is controlled at 0.3MPa. During the production process, the particle length (standard is 4±0.5mm) and hardness (requirement ≥1.8kgf) are checked every hour, and the screw speed and die pressure are finely adjusted according to the test results.

[0068] Drying and screening: The granulated material is dried using a mesh belt dryer. The hot air temperature is set to 60℃, the mesh belt speed is 0.8m / min, and the drying time is 40 minutes. The dried granules are then screened through a double-layer vibrating screen (upper screen with a mesh size of 5.5mm and lower screen with a mesh size of 2.5mm). The particle diameter is controlled to be 3-5mm. Unqualified particles are collected and re-crushed and granulated.

[0069] Packaging and storage: Use 0.15mm thick PE sealed bags with food-grade deoxidizer packets inside. Use a fully automatic packaging machine to vacuum seal the soil conditioner granules. Each bag weighs 20kg. The storage warehouse should maintain a temperature of 10-30℃ and a relative humidity of <60%. Regularly check the integrity of the packaging.

[0070] Field application effect study of different application rates

[0071] Using different amounts of biogas residue soil conditioner granules as the research object, and the maize variety A1819, which was bred by the Shanxi Organic Dryland Agriculture Research Institute, as the test crop, an experiment on the appropriate amount of biogas residue soil conditioner was carried out in Lifang Village, Yuci. The experiment adopted a randomized block design, with application rates of 0 (T1), 20 kg / mu (T2), 30 kg / mu (T3), and 40 kg / mu (T4), with each treatment replicated 3 times. The plot area was 6×4 m2, and the plots of different treatments were separated by ridging. 4400 maize plants were planted per 667 m2, with a plant spacing of 0.28 m and a row spacing of 0.50 m. Before sowing, compound fertilizer (N:P2O5:K2O=17-17-17) of 40 kg / mu was applied, and other management was the same as usual. (1) Effects of different amounts of biogas residue soil conditioner on plant height, stem diameter and chlorophyll content of dryland maize.

[0072] Depend on Figure 4-5 It can be seen that the plant height and stem diameter of maize varied with the application rate and region of biogas residue-based soil conditioner. In Lifang, Yuci, there was no significant difference in plant height among different application rates during the early growth stage of maize. However, in the later growth stage, the plant height of the T3 treatment was significantly increased by 8.88% compared with the CK treatment.

[0073] (2) Effects of applying different amounts of biogas residue-based soil conditioner on the yield of maize in dryland areas

[0074] Depend on Figure 6 It was found that at the Lifang experimental site in Yuci, the maize yield of the T3 treatment was significantly higher than that of other treatments, with a 9.02% increase compared to the control (CK). Compared to other treatments using biogas residue-based soil conditioners, the yield increased significantly by 135.57 kg–156.70 kg, an increase of 15.65%–18.54%. At the Qinbi experimental site in Hongtong, the yield of the T3 treatment increased by 16.01% compared to the CK treatment, but the difference was not statistically significant. The yield of the T3 treatment was significantly higher than that of the T1 and T2 treatments by 22.49%–23.27%.

[0075] (3) Effects of applying different amounts of biogas residue-based soil conditioner on soil compaction

[0076] Depend on Figure 7It was found that at the Lifang experimental site in Yuci, there were no significant differences in soil compaction among the treatments in the 0-5cm and 5-10cm soil layers during the early and late growth stages of dryland maize. In the mid-growth stage (0-5cm soil layer), the compaction of the CK treatment was significantly higher than other treatments, while the soil compaction value of the T3 treatment was significantly lower than that of the CK treatment by 45.77%. In the 5-10cm soil layer, the compaction of the T3 treatment was lower than all other treatments, and its soil compaction was significantly lower than that of the CK treatment by 40.57%. In the 10-30cm soil layer, there were no significant differences among the treatments in the early growth stage of dryland maize. In the mid-growth stage, the soil compaction of the treatments applying biogas residue-based soil conditioner was significantly lower than that of the CK, with the T1 treatment showing a 29.11% reduction in soil compaction compared to the CK. In the late growth stage of dryland maize, the soil compaction of the T3 treatment was 24.51% lower than that of the CK treatment.

[0077] (4) Effects of applying different amounts of biogas residue-based soil conditioner on soil bulk density and soil moisture content

[0078] Depend on Figure 8-9 It was found that the soil compaction in the 10-30cm soil layer was significantly higher than that in other soils, while the soil bulk density did not differ significantly among treatments. At the Lifang experimental site in Yuci, the soil moisture content in the 0-5cm soil layer during the early growth stage of dryland maize did not differ significantly among treatments. In the 5-10cm soil layer analysis, regardless of whether it was the early or middle growth stage of dryland maize, the soil moisture content of treatments T1 and T3 was significantly higher than that of the control (CK) treatment. Compared with the CK treatment, the soil moisture content increased by 21.52%–29.10% and 20.24%–20.83% in the two periods, respectively. In the later growth stage of dryland maize, the soil moisture content in the 5-10cm soil layer of the CK treatment was significantly higher than that of other treatments, while the differences among the other treatments were not significant. At the Qinbi experimental site in Hongtong, the differences in soil moisture content among different soil layers were significant, while the differences among different treatments were not significant.

[0079] (5) Effects of applying different amounts of biogas residue-based soil conditioner on soil organic matter content

[0080] Depend on Figure 10 It can be seen that soil nutrients show an overall decreasing trend as the growth period of dryland maize progresses. In the early stage of dryland maize growth (0-30cm soil layer), the soil organic matter content in the treatments using biogas residue-based soil conditioners was higher than that in the control (CK) treatment, with increases ranging from 4.99% to 13.43%. In the later stage of dryland maize growth, the soil organic matter content in the 5-10cm soil layer of the T2 treatment was significantly higher than that of the CK treatment by 8.25%.

[0081] Experimental data on water repellency of biogas residue

[0082] Table 1. Water repellency of biogas residue-based soil conditioners

[0083]

[0084] wetting agent test

[0085] Table 2. Effects of adding different concentrations of wetting agent on biogas residue-based soil conditioner

[0086]

[0087] In a specific embodiment, an experiment was conducted using a modified feed machine. The results showed that the soil treated with the granular biogas residue soil conditioner prepared in this invention reduced soil bulk density, promoted plant growth, and significantly increased soil organic matter. At the same time, the product is completely degradable in the soil with no residue, making it an environmentally friendly product.

[0088] The implementation reveals the raw material costs: biogas residue is agricultural waste, with a procurement cost of about 200 yuan / ton, which is far lower than that of commercial organic fertilizer (800-1200 yuan / ton); the cost of acidifiers such as vinegar residue and furfural residue is only 1 / 3 of that of industrial-grade acidifiers.

[0089] Production-side savings: Compared with traditional soil conditioners, each ton of product can reduce raw material costs by about 400 yuan. If the annual production capacity is 1,000 tons, the annual cost savings will be 400,000 yuan.

[0090] User benefits: Applying 30kg of this soil conditioner per mu (costing about 60 yuan) can replace 20kg of commercial conditioner (costing about 120 yuan), while reducing fertilizer use by 15%, resulting in an overall reduction of agricultural input expenditure of 80-100 yuan per mu.

[0091] Economic benefits:

[0092] Short-term: The Yuci Lifang trial showed that the T3 treatment (30kg / mu) increased the corn yield by 135.57kg / mu. Based on the market price of 2.8 yuan / kg, the income per mu increased by 379.6 yuan, with an input-output ratio of 1:6.3.

[0093] Long-term: Continuous application for 3 years can increase the soil organic matter content by 13.43%, reduce subsequent improvement investment, and save an average of 120 yuan per mu per year in maintenance costs.

[0094] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A granular biogas residue soil conditioner for both feed and machinery preparation, characterized in that, include: The mixture consists of 90-100 parts of biogas residue with a moisture content of 3-5% after dry-wet separation, 5-10 parts of acidifier, 3-5 parts of binder, 20-30 parts of peat moss, 15-25 parts of perlite, 5-8 parts of mineral fertilizer, 2-4 parts of trace elements, and 1-2 parts of sophorolipid at a concentration of 3% used as a wetting agent. The remainder is mineral fertilizer.

2. The feed and machinery dual-purpose granular biogas residue soil conditioner according to claim 1, characterized in that: By weight, it includes 95 parts of biogas residue with a moisture content of 4% after dry-wet separation, 8 parts of acidifier, 4 parts of binder, 25 parts of peat, 20 parts of perlite, 7 parts of mineral fertilizer, 3 parts of trace elements, and 1.5 parts of 3% sophorolipid as a wetting agent.

3. The feed and machinery dual-purpose granular biogas residue soil conditioner according to claim 1, characterized in that: The acidifier is a mixture of vinegar residue and furfural residue in a 1:2 ratio, and the binder is a mixture of konjac polysaccharide and modified chitosan in a 1:1.5 ratio.

4. The feed and machinery dual-purpose granular biogas residue soil conditioner according to claim 1, characterized in that: The mineral fertilizer is calcium or magnesium, and the trace element is zinc or iron.

5. A method for preparing granular biogas residue soil conditioner for both feed and machinery use, characterized in that, This method is used to prepare the feed and machinery dual-purpose granular biogas residue soil conditioner according to any one of claims 1-4, comprising the following steps: S1. After removing impurities, the biogas residue is separated into biogas liquid by a dry-wet separator. The biogas residue is turned over and dried until the moisture content reaches 4%. The biogas residue, wetting agent, and binder are added to the mixer (1) in proportion and mixed thoroughly. S2. Then add peat moss, perlite, mineral fertilizer, trace elements and sophorolipids into the mixer (1) and mix them evenly with the biogas residue. S3. After uniform mixing, the mixture is taken out from the mixer (1) and conveyed to the granulation mold. During the granulation process, the mixture is pressed into cylindrical particles with a diameter of 3-5 mm by the squeezing action of the mold. S4. When using the warm air drying method, hot air is sent into the drying chamber by a fan to reduce the moisture content of the particles to 8-10%. When using the flat-bottom drying method, the particles are evenly spread on a clean cement floor or plastic film and dried in sunny weather, turning them 2-3 times a day. The dried particles are then sieved through a double-layer screen with apertures of 2.5-3.5mm and 3.5-5.5mm to remove unqualified particles with a diameter less than 2.5mm and greater than 5.5mm. S5. After drying, the granules are sealed in small-mouthed sealed bags to package the granular soil conditioner.

6. The method for preparing granular biogas residue soil conditioner for both feed and machinery use according to claim 5, characterized in that: In steps S1 and S2, the mixing time for the materials is 15-20 minutes to ensure that the materials are mixed evenly.

7. The method for preparing granular biogas residue soil conditioner for both feed and machinery use according to claim 5, characterized in that: In steps S1 and S2, the rotation speed is controlled at 100-150 rpm during material mixing.

8. The method for preparing granular biogas residue soil conditioner for both feed and machinery use according to claim 5, characterized in that: In step S4, the drying temperature is controlled at 60-80℃ and the drying time is 30-60 minutes. During the drying process, the moisture content of the particles is checked every 10 minutes, and the hot air temperature and flow rate are adjusted in time according to the change in moisture content. If flat drying is used, the drying time is no less than 2 days.

9. The method for preparing granular biogas residue soil conditioner for both feed and machinery use according to claim 5, characterized in that: The surface of the mixer (1) in steps S1 and S2 is provided with a vibration motor (2), and the bottom of the mixer (1) is connected to a frame (3), and several dampers (4) are also connected between the frame (3) and the mixer (1).

10. The method for preparing granular biogas residue soil conditioner for both feed and machinery use according to claim 5, characterized in that: The bottom of the mixer (1) is connected to a servo motor (5), and the output shaft of the servo motor (5) rotates through the mixer (1) and is connected to the rotating block (6). The surface of the rotating block (6) is connected to a stirring rod (7), and a pressure roller (8) is rotatably connected to the stirring rod (7) through a bearing.

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