Modified biomass ash, and a preparation method and application thereof

Abstract

The application discloses modified biomass ash as well as a preparation method and application thereof, and belongs to the technical field of modified materials. The preparation method of the modified biomass ash comprises the following steps: mixing biomass ash, poultry feather hydrolysate and a flocculating agent, and then drying to obtain the modified biomass ash. The application further provides modified biomass ash prepared by the above preparation method. In addition, the application further provides application of the modified biomass ash prepared by the above preparation method or the modified biomass ash in preparation of a soil conditioner. The modified biomass ash can improve heavy metal contaminated soil and improve the quality of crops.

Description

Technical Field

[0001] This invention relates to the field of modified materials technology, specifically to a modified biomass ash, its preparation method, and its application. Background Technology

[0002] Biomass energy, as an important form of renewable energy, has seen rapid development accompanied by the generation of large amounts of biomass ash. Landfilling biomass ash not only increases the economic burden but also occupies land and poses unpredictable environmental risks. Although biomass ash is a solid waste, it is also a usable resource from a resource utilization perspective. Currently, the utilization of biomass ash both domestically and internationally is mainly in construction, agriculture, and the environment, and also includes the manufacture of mineral and ceramic materials and the recovery of useful components. In agricultural production, the best utilization method is the production of soil conditioners. Studies have found that biomass ash has a good soil-improving effect and a significant effect on crop quality enhancement.

[0003] Modification of biomass ash mainly falls into two categories: physical modification, exemplified by ball milling, and chemical modification. Physical modification significantly improves the adsorption capacity of ball-milled biomass ash; however, prolonged milling leads to fly ash agglomeration, drastically reducing specific surface area and adsorption efficiency. Chemical modification includes organic and inorganic salt modifications. Current research on biomass ash modification primarily focuses on chemical modification. Most modified biomass ash exhibits good pollutant adsorption performance or effective soil remediation. However, the cost of the modified materials is a limiting factor for the practical application and industrial transformation of modified biomass ash. Developing new modification technologies with controllable costs is therefore of practical significance. How to obtain modified biomass ash that improves soil and enhances crop quality using simple methods is a problem that current technologies need to address. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a modified biomass ash, its preparation method and application, thereby solving the technical problem in the prior art of how to obtain modified biomass ash that can improve soil and enhance crop quality using a simple method.

[0005] To achieve the above-mentioned technical objectives, the present invention provides a method for preparing modified biomass ash, comprising the following steps:

[0006] Modified biomass ash is obtained by mixing biomass ash, poultry feather hydrolysate, and flocculant, followed by drying.

[0007] Further, the poultry feather hydrolysate is prepared by the following steps: adding poultry feathers at a solid-liquid mass-volume ratio of 1g:4-5mL to an acidic solution with a concentration of 4-4.5mol / L, hydrolyzing the solution at 90-100℃ to obtain the poultry feather hydrolysate, and adjusting the pH of the hydrolysate to 1-6 with a neutralizing agent.

[0008] Further, the acidic solution is a sulfuric acid solution; and / or, the neutralizing agent is Ca(OH)2.

[0009] Further, the ratio of the biomass ash to the poultry feather hydrolysate is 1g:5-14mL; and / or, the amount of flocculant added is 5-10% of the mass of the biomass ash.

[0010] Furthermore, the flocculant is one or both of polyferric sulfate and polyacrylamide.

[0011] Furthermore, the mixture further includes an oscillating reaction; further, the oscillating reaction is carried out at a temperature of 25-28°C and a rate of 175-190 r·min. -1 .

[0012] Furthermore, the duration of the oscillation reaction is 24-28 hours.

[0013] Furthermore, following the oscillating reaction, a centrifugal treatment is also included: the centrifugation speed is 3500-4000 r·min. -1 The time is 10-20 minutes.

[0014] In addition, the present invention also proposes a modified biomass ash, which is prepared by the above preparation method.

[0015] Furthermore, the present invention also proposes a modified biomass ash prepared by the above-mentioned method, or the application of the above-mentioned modified biomass ash in the production of soil conditioners.

[0016] Compared with the prior art, the beneficial effects of the present invention include: the present invention mixes biomass ash, poultry feather hydrolysate and flocculant, and then dries to obtain modified biomass ash. This modified biomass ash can load amino acids in the hydrolysate and has a nitrogen slow-release effect. It also has the function of adsorbing and passivating cadmium. It can improve the quality of crops while reducing the cadmium and nitrate content of crops and promote the conversion of cadmium in the soil in exchange-bound and carbonate-bound forms with higher plant availability to iron-manganese oxide-bound forms with lower plant availability. Furthermore, it can particularly increase the vitamin C, soluble protein and soluble sugar content of Chinese cabbage and reduce the cadmium and nitrate content of Chinese cabbage. Attached Figure Description

[0017] Figure 1This is the result of the soluble protein content of bok choy obtained from different treatments in the greenhouse experiment proposed in this invention.

[0018] Figure 2 These are the results of the soluble sugar content of bok choy obtained from different treatments in the greenhouse experiment of this invention.

[0019] Figure 3 The results show the vitamin C content of bok choy obtained from different treatments in the greenhouse experiment proposed in this invention.

[0020] Figure 4 The results show the nitrate content of bok choy obtained from different treatments in the greenhouse experiment proposed in this invention.

[0021] Figure 5 This is the result of cadmium content in bok choy obtained from different treatments in the greenhouse experiment proposed in this invention. Detailed Implementation

[0022] This specific embodiment provides a method for preparing modified biomass ash, including the following steps:

[0023] Biomass ash, poultry feather hydrolysate, and flocculant are mixed and then subjected to a shaking reaction for 24-28 hours; furthermore, the shaking reaction is carried out at a temperature of 25-28℃ and a rate of 175-190 r·min. -1 Then, centrifuge at a speed of 3500-4000 r / min. -1 The drying process takes 10-20 minutes; followed by drying to obtain modified biomass ash; the ratio of biomass ash to poultry feather hydrolysate is 1g:5-14mL; and / or, the amount of flocculant added is 5-10% of the mass of the biomass ash; the flocculant is one or both of polyferric sulfate (PFS) and polyacrylamide (PAM). The biomass ash can be from a biomass power plant or heating plant, and is the ash obtained from burning biomass briquettes.

[0024] In some embodiments, the poultry feather hydrolysate is prepared by the following steps: adding poultry feathers at a solid-liquid mass-volume ratio of 1g:4-5mL to an acidic solution with a concentration of 4-4.5mol / L, hydrolyzing at 90-100℃ for 7-10h to obtain chicken feather hydrolysate, and adjusting the pH of the hydrolysate to 3-4 with a neutralizing agent. In some embodiments, the poultry feathers can be chicken feathers, duck feathers, or goose feathers, etc.

[0025] This specific embodiment also proposes a modified biomass ash, which is prepared by the above preparation method.

[0026] This specific embodiment also proposes a modified biomass ash prepared by the above-mentioned method, or the application of the above-mentioned modified biomass ash in the production of soil conditioners.

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] It should be noted that the biomass ash in the following examples was provided by Hubei Xiangyanghu Biotechnology Co., Ltd., and was obtained by burning straw and rice husks.

[0029] Example 1

[0030] This embodiment proposes an amino acid-supported modified biomass ash, which is prepared by the following steps:

[0031] (1) Preparation of chicken feather hydrolysate

[0032] Add 125g of chicken feathers to 500mL of 4.5mol / L H2SO4 solution and hydrolyze at 100℃ for 7h. After the reaction is complete, let the hydrolysate cool to room temperature, filter out the residue, and obtain chicken feather hydrolysate. Use Ca(OH)2 as a neutralizing agent to adjust the pH of the chicken feather hydrolysate to 1, 2, 3, 4, 5 and 6 for a total of six groups.

[0033] (2) Modification of biomass ash

[0034] Six groups of 1.25g biomass ash were weighed into 50mL centrifuge tubes, and 10mL of chicken feather hydrolysate with pH values ​​of 1, 2, 3, 4, 5, and 6 were added to each tube. 12.5mL of 5g / L PAM solution was then added, and the mixtures were centrifuged at 25℃ at 175r·min. -1 The reaction was carried out at a rate of oscillation for 24 hours. The reaction was carried out at 4000 r·min⁻¹. -1 Centrifuge at a certain speed for 10 minutes, and dry the residual solid to prepare amino acid-supported modified biomass ash.

[0035] Example 2

[0036] This embodiment proposes an amino acid-supported modified biomass ash, which is prepared by the following steps:

[0037] (1) Preparation of chicken feather hydrolysate

[0038] 125g of chicken feathers were added to 500mL of 4.5mol / L H2SO4 solution and hydrolyzed at 100℃ for 7h. After the reaction was complete, the hydrolysate was cooled to room temperature, and the residue was filtered off to obtain chicken feather hydrolysate. The pH of the chicken feather hydrolysate was adjusted to 1, 2, 3, 4, 5, and 6 using Ca(OH)2 as a neutralizing agent, resulting in six groups.

[0039] (2) Modification of biomass ash

[0040] Six groups of 1.25g biomass ash were weighed into 50mL centrifuge tubes, and 10mL of chicken feather hydrolysate with pH values ​​of 1, 2, 3, 4, 5, and 6 were added respectively. 1.25mL of 50g / L PFS solution was then added, and the mixtures were centrifuged at 25℃ at 175r·min. -1 The reaction was carried out at a rate of oscillation for 24 hours. The reaction was carried out at 4000 r·min⁻¹. -1 Centrifuge at a certain speed for 10 minutes, and dry the residual solid to prepare amino acid-supported modified biomass ash.

[0041] Example 3

[0042] This embodiment proposes an amino acid-supported modified biomass ash, which is prepared by the following steps:

[0043] (1) Preparation of chicken feather hydrolysate

[0044] 125g of chicken feathers were added to 500mL of 4.5mol / L H2SO4 solution and hydrolyzed at 100℃ for 7h. After the reaction was completed, the digestion solution was cooled to room temperature, and the residue was filtered off to obtain the chicken feather hydrolysate. The pH of the chicken feather hydrolysate was adjusted to 3 using Ca(OH)2 as a neutralizing agent.

[0045] (2) Modification of biomass ash

[0046] Weigh 1.00 g of each of the five groups of biomass ash into 50 mL centrifuge tubes, and add 13.3, 10, 8, 6.7, and 5.7 mL of chicken feather hydrolysate, respectively, with solid-liquid concentrations of 75, 100, 125, 150, and 175 g / L. Add 12.5 mL of 5 g / L PAM solution, and centrifuge at 25 °C and 175 r·min. -1 The reaction was carried out at a rate of oscillation for 24 hours. The reaction was carried out at 4000 r·min⁻¹. -1 Centrifuge at a certain speed for 10 minutes, and dry the residual solid to prepare amino acid-supported modified biomass ash.

[0047] Example 4:

[0048] This embodiment proposes an amino acid-supported modified biomass ash, which is prepared by the following steps:

[0049] (1) Preparation of chicken feather hydrolysate

[0050] 125g of chicken feathers were added to 500mL of 4.5mol / L H2SO4 solution and hydrolyzed at 100℃ for 7h. After the reaction was completed, the digestion solution was cooled to room temperature, and the residue was filtered off to obtain the chicken feather hydrolysate. The pH of the chicken feather hydrolysate was adjusted to 3 using Ca(OH)2 as a neutralizing agent.

[0051] (2) Modification of biomass ash

[0052] Five groups of 1.00g biomass ash were weighed into 50mL centrifuge tubes, and 13.3, 10, 8, 6.7, and 5.7mL of chicken feather hydrolysate were added respectively, with solid-liquid mass concentrations of 75, 100, 125, 150, and 175g / L. 1.25mL of 50g / L PFS solution was added, and the mixtures were centrifuged at 25℃ at 175r·min. -1 The reaction was carried out at a rate of oscillation for 24 hours. The reaction was carried out at 4000 r·min⁻¹. -1 Centrifuge at a certain speed for 10 minutes, and dry the residual solid to prepare amino acid-supported modified biomass ash.

[0053] Example 5

[0054] This embodiment proposes an amino acid-supported modified biomass ash, which is prepared by the following steps:

[0055] (1) Preparation of chicken feather hydrolysate

[0056] 125g of chicken feathers were added to 500mL of 4.5mol / L H2SO4 solution and hydrolyzed at 100℃ for 7h. After the reaction was complete, the hydrolysate was cooled to room temperature, and the residue was filtered off to obtain the chicken feather hydrolysate. The pH of the chicken feather hydrolysate was adjusted to 3 using Ca(OH)2 as a neutralizing agent.

[0057] (2) Modification of biomass ash

[0058] Weigh 1.25 g of biomass ash into a 50 mL centrifuge tube, add 10 mL of chicken feather hydrolysate at pH 3, then add 12.5 mL of 5 g / L PAM solution and 1.25 mL of 50 g / L PFS solution, and centrifuge at 25 °C and 175 r·min. -1 The rate of the oscillating reaction was 4000 r·min for 24 h. -1 Centrifuge at a certain speed for 10 minutes, and dry the residual solid to prepare amino acid-supported modified biomass ash.

[0059] Example 6

[0060] This embodiment proposes an amino acid-supported modified biomass ash, which is prepared by the following steps:

[0061] (1) Preparation of chicken feather hydrolysate

[0062] 100g of chicken feathers were added to 500mL of 4mol / L H2SO4 solution and hydrolyzed at 90℃ for 10h. After the reaction was complete, the hydrolysate was cooled to room temperature, and the residue was filtered off to obtain the chicken feather hydrolysate. The pH of the chicken feather hydrolysate was adjusted to 3 using Ca(OH)2 as a neutralizing agent.

[0063] (2) Modification of biomass ash

[0064] Weigh 1.25 g of biomass ash into a 50 mL centrifuge tube, add 12.5 mL of chicken feather hydrolysate at pH 3, add 1.25 mL of 50 g / L PFS solution, and centrifuge at 190 r·min at 28 °C. -1 The reaction was carried out at a rate of oscillation for 28 h. The reaction was carried out at 3500 r·min. -1 Centrifuge at a certain speed for 20 minutes, and dry the residual solid to prepare amino acid-supported modified biomass ash.

[0065] In Example 1, the pH of the chicken feather hydrolysate varied from 1 to 6. The main difference between Example 1 and Example 2 was the addition of different flocculants. Among the hydrolysates with different pH values, the total nitrogen content of the biomass ash was highest at pH=3. In Example 1, the total nitrogen content was highest at 1.1% when PAM was added, while in Example 2, the total nitrogen content was highest at 0.8% when PFS was added.

[0066] Example 3 used different solid-liquid mass concentrations of 75, 100, 125, 150, and 175 g / L, differing from Example 4 mainly in the type of flocculant used. At a concentration of 125 g / L, the total nitrogen content of the bioash with added PAM reached a maximum of 1.1%; with added PFS, the total nitrogen content was 1.0%. Although further increasing the solid-liquid mass concentration would increase the total nitrogen content of the bioash, the increase was relatively small. Considering economic efficiency, 125 g / L was chosen as the optimal solid-liquid mass concentration.

[0067] Example 5 added two flocculants. The total nitrogen content of biomass ash modified by the combination of 5% PAM and 5% PFS at pH=3 and a solid-liquid mass concentration of 125 g / mL was 1.8%. The total nitrogen content of biomass ash modified by the combination of flocculants was significantly higher than that modified by flocculants alone.

[0068] The experimental results show that the production conditions in Example 5 are optimal.

[0069] Greenhouse pot experiment with fertilizer:

[0070] (1) The amino acid-modified biomass ash prepared in Example 5 was used in a pot experiment to verify the fertilizer effect. Two treatment groups were set up: no cadmium pollution (no cadmium added) and simulated cadmium pollution (cadmium added amount of 0.6 mg / kg). There were 6 treatments in each group, for a total of 12 treatments, and 3 replicates for each treatment.

[0071] CK treatment: Soil cadmium pollution concentration was 0 mg / kg. Phosphorus and potassium fertilizers were applied at a rate of 0.10 g P2O5 and 0.20 g K2O / kg soil.

[0072] Treatment CK1: Soil cadmium pollution concentration was 0 mg / kg. Phosphorus and potassium fertilizers were applied as basal fertilizer at a rate of 0.10 g P₂O₅ and 0.20 g K₂O / kg soil. Dilute sulfuric acid with the same acid content as the hydrolysate was applied.

[0073] Hy treatment: Soil cadmium pollution concentration was 0 mg / kg. Phosphorus and potassium fertilizers were applied at a rate of 0.10 g P2O5 and 0.20 g K2O / kg soil. Amino acid hydrolysate was applied at a rate of 0.2 g N (5.3 mL hydrolysate) / kg soil.

[0074] BA treatment: Soil cadmium pollution concentration was 0 mg / kg. Phosphorus and potassium fertilizers were applied as a base fertilizer at a rate of 0.10 g P₂O₅ and 0.20 g K₂O / kg soil. Biomass ash was applied at a rate of 11.2 g / kg soil.

[0075] BAHy treatment: Soil cadmium pollution concentration was 0 mg / kg. Phosphorus and potassium fertilizers were applied as a base fertilizer at a rate of 0.10 g P₂O₅ and 0.20 g K₂O / kg soil. Biomass ash and amino acid hydrolysate were then applied. The biomass ash and amino acid hydrolysate were applied at a rate of 11.2 g biomass ash + 5.3 mL hydrolysate (0.2 g N) / kg soil.

[0076] MBA treatment: The soil cadmium pollution concentration was 0 mg / kg. Phosphorus and potassium fertilizers were applied at a rate of 0.10 g P2O5 and 0.20 g K2O / kg soil. Modified bioash from Example 5 was applied at a rate of 0.2 g N (11.2 g modified bioash (MBA)) / kg soil.

[0077] CK-Cd treatment: Soil cadmium pollution concentration was 0.6 mg / kg. Phosphorus and potassium fertilizers were applied as base fertilizers at a rate of 0.10 g P2O5 and 0.20 g K2O / kg soil.

[0078] CK1-Cd treatment: Soil cadmium pollution concentration was 0.6 mg / kg. Phosphorus and potassium fertilizers were applied as basal fertilizers at a rate of 0.10 g P2O5 and 0.20 g K2O / kg soil. Dilute sulfuric acid with the same acid content as the hydrolysate was applied.

[0079] Hy-Cd treatment: The soil cadmium pollution concentration was 0.6 mg / kg. Phosphorus and potassium fertilizers were applied at a rate of 0.10 g P2O5 and 0.20 g K2O / kg soil, and amino acid hydrolysate was applied at a rate of 0.2 g N (5.3 mL hydrolysate) / kg soil.

[0080] BA-Cd treatment: The soil cadmium pollution concentration was 0.6 mg / kg. Phosphorus and potassium fertilizers were applied at a rate of 0.10 g P2O5 and 0.20 g K2O / kg soil. Biomass ash was applied at a rate of 11.2 g / kg soil.

[0081] BAHy-Cd treatment: Soil cadmium pollution concentration was 0 mg / kg. Phosphorus and potassium fertilizers were applied as basal fertilizer at a rate of 0.10 g P2O5 and 0.20 g K2O / kg soil. Biomass ash and amino acid hydrolysate were applied at a rate of 11.2 g biomass ash + 5.3 mL hydrolysate / kg soil.

[0082] MBA-Cd treatment: The soil cadmium pollution concentration was 0.6 mg / kg. Phosphorus and potassium fertilizers were applied as a base fertilizer at a rate of 0.10 g P₂O₅ and 0.20 g K₂O / kg soil. Modified biomass ash from Example 5 was applied at a rate of 0.2 g N (11.2 g modified biomass ash (MBA)) / kg soil. The experimental results are shown in Table 1 and... Figure 1-5 As shown.

[0083] Table 1. Effects of different treatments on the yield of potted bok choy

[0084]

[0085] Note: The test soil was taken from Xin'andu Street, Dongxihu District, Wuhan City, Hubei Province (30°45′48.42″N, 113°56′10.25″E). It is a calcareous soil with a pH of 7.6, organic matter of 5.7 g / kg, available nitrogen of 325 mg / kg, available phosphorus of 7.5 mg / kg, available potassium of 95.2 mg / kg, and cadmium not detected.

[0086] Table 1 shows that in calcareous soil without cadmium pollution (no added cadmium), the yields of MBA, BAHy, and Hy increased by 39.9%, 24.3%, and 21.6% respectively compared to CK1. MBA's yield increased by 12.5% ​​compared to BAHy, while BA's yield increased by only 4.1% compared to CK1. In calcareous soil with simulated cadmium pollution (cadmium addition of 0.6 mg / kg), the yields of MBA-Cd, BAHy-Cd, and Hy-Cd increased by 47.4%, 24.8%, and 27.1% respectively compared to CK1-Cd. MBA-Cd's yield increased by 18.1% compared to BAHy-Cd, and BA-Cd's yield increased by 10.5% compared to CK1-Cd.

[0087] In summary, regardless of whether the soil is free of cadmium pollution or contaminated with cadmium, the application of modified biomass ash (MBA) can significantly increase the yield of pak choi, with better results than the application of biomass ash alone (BA), the application of hydrolysate alone (Hy), or the mixture of biomass ash and chicken feather hydrolysate (BAHy). This indicates that modified biomass ash (MBA) can better promote the increase of pak choi yield.

[0088] Figure 1-3The study investigated three quality indicators of pak choy under different fertilization treatments. All fertilization treatments improved pak choy quality. In cadmium-free soil, the MBA treatment significantly increased the soluble sugar, vitamin C, and soluble protein content of pak choy compared to the control (CK0), reaching 11.5 mg / g, 141.5 mg / g, and 7.8 mg / g, respectively, representing increases of 51.5%, 29.4%, and 12.9% compared to the CK0 treatment. In simulated cadmium-contaminated soil, the MBA treatment resulted in soluble sugar, vitamin C, and soluble protein content of pak choy at 10.1 mg / g, 139.6 mg / g, and 6.9 mg / g, respectively, increases of 49.6%, 38.0%, and 12.9% compared to the CK0-Cd treatment.

[0089] Figure 4 The cadmium content of pak choi under different treatments was shown in the order of CK1-Cd > Hy-Cd > CK0-Cd > BAHy-Cd > MBA-Cd, indicating that modified biomass ash can reduce cadmium accumulation in pak choi.

[0090] Figure 5 The distribution of cadmium speciation in soil from pot experiments under different treatments is shown in Figure 5. F1 represents residual cadmium, F2 represents organically bound cadmium, F3 represents cadmium bound by iron-manganese oxides, F4 represents carbonate-bound cadmium, and F5 represents exchangeable cadmium. Significant differences were observed in cadmium speciation among the different treatments. In the MBA-Cd treatment, the proportions of exchangeable cadmium, carbonate-bound cadmium, and cadmium bound by iron-manganese oxides were 19.7%, 31.7%, and 43.8%, respectively, accounting for 95.2% of the total cadmium. MBA-Cd had the lowest proportion of exchangeable cadmium and the highest proportion of cadmium bound by iron-manganese oxides among the six treatments. This indicates that modified biomass ash can better promote the conversion of cadmium speciation to iron-manganese oxides, which have lower bioavailability in plants, thus having a passivating effect.

[0091] Therefore, the amino acid-modified bioash produced by the production method proposed in this invention can not only increase the yield and quality of Chinese cabbage, but also improve the soil and reduce the content of plant-available cadmium in the soil, thereby reducing the amount of cadmium absorbed by plants.

[0092] This invention utilizes sulfuric acid to hydrolyze chicken feathers, mixes the resulting amino acid hydrolysate with biomass ash, and adds a flocculant solution to produce amino acid-supported modified biomass ash. Firstly, it effectively utilizes biomass ash and chicken feathers, reducing waste treatment costs; secondly, it produces amino acid-supported modified biomass ash with a certain nitrogen slow-release effect; and thirdly, it enhances the adsorption and passivation capabilities of biomass ash for cadmium.

[0093] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for preparing a modified biomass ash, characterized by, The method comprises the following steps: The biomass ash, the poultry feather hydrolysate and a flocculating agent are mixed, and then dried to obtain modified biomass ash; The poultry feather hydrolysate is prepared by the following steps: the poultry feather is added into an acid solution with a concentration of 4-4.5 mol / L at a solid-liquid mass volume ratio of 1 g:4-5 mL, and a hydrolysis reaction is carried out at 90-100 ℃ to obtain the poultry feather hydrolysate, and a neutralizing agent is used to adjust the pH of the hydrolysate to 1-6; The biomass ash and the poultry feather hydrolysate are used in a ratio of 1 g:5-14 mL; the addition amount of the flocculating agent is 5-10% of the mass of the biomass ash; and the flocculating agent is one or both of polymeric ferric sulfate and polyacrylamide.

2. The method of claim 1, wherein the modified biomass ash is prepared by the steps of: The acid solution is a sulfuric acid solution; and / or the neutralizing agent is Ca(OH)2.

3. The method of claim 1, wherein the modified biomass ash is prepared by the steps of: After mixing, an oscillation reaction is further included; further, the oscillation reaction has a temperature of 25-28℃ and a rate of 175-190 r·min -1 .

4. The method of producing a modified biomass ash according to claim 3, characterized by, The oscillation reaction is carried out for 24-28 h.

5. The method of claim 3, wherein the modified biomass ash is prepared by the steps of: The oscillation reaction is followed by centrifugal treatment: the centrifugal treatment is at a rotation speed of 3500-4000 r·min -1 , and for a time of 10-20 min.

6. A modified biomass ash characterized in that, The modified biomass ash is prepared by the preparation method of any one of claims 1-5.

7. The modified biomass ash prepared by the preparation method of any one of claims 1-5 or the application of the modified biomass ash of claim 6 in the preparation of soil conditioners.

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