Regeneration method of solid waste
By pre-treating, impregnating, and regenerating waste concrete blocks and biomass waste, and utilizing the enzymes in the composite bacterial solution to promote the decomposition of lignocellulose and the formation of calcium carbonate deposits, the problems of high modification cost and poor mechanical properties of waste concrete blocks are solved, and low-cost, high-performance recycled concrete is achieved.
Patent Information
- Application Number
- CN202411183101.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2026-03-06
AI Technical Summary
Existing technologies suffer from high costs in modifying waste concrete blocks and poor mechanical properties of recycled concrete.
By pre-treating, impregnating, and regenerating waste concrete blocks and biomass waste containing lignocellulose, cellulase and carbonic anhydrase in the compound bacterial solution are used to promote the decomposition of lignocellulose and form calcium carbonate deposits in the regeneration process, reducing water absorption and crushing index. Then, it is mixed with cement to form recycled concrete.
This has enabled the reduction of the cost of recycled concrete and the improvement of its mechanical properties, including compressive strength, splitting strength and modulus of elasticity.
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Figure CN121609534A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of waste treatment technology, and more specifically, to a method for regenerating solid waste. Background Technology
[0002] Building demolition typically generates a large amount of waste concrete blocks. Improper disposal of these blocks can lead to long-term environmental pollution and resource waste. Therefore, how to handle waste concrete blocks has become a major issue concerning the green development of the construction industry.
[0003] In related technologies, waste concrete blocks are modified to address their defects, such as high water absorption, high porosity, and high crushing index, by adding nanomaterials to obtain recycled concrete. However, the above modifications are not only costly, but also result in recycled concrete with poor mechanical properties. Summary of the Invention
[0004] In view of this, this application provides a method for recycling solid waste, which can reduce the cost of obtaining recycled concrete and also enable the recycled concrete to have good mechanical properties.
[0005] This application provides a method for recycling solid waste, including: The pretreatment process involves pretreating the solid waste to obtain crushed material, wherein the solid waste includes waste concrete blocks and biomass waste containing lignocellulose. The impregnation process involves impregnating the crushed material in a compound bacterial solution to obtain a slurry, wherein the compound bacterial solution includes a first strain capable of releasing cellulase and a second strain capable of releasing carbonic anhydrase. In the recycling process, the slurry is mixed with a calcium salt solution to obtain recycled aggregate; In the mixing process, the recycled aggregate and cement are stirred and mixed to obtain recycled concrete.
[0006] According to any of the foregoing embodiments of this application, the pretreatment step includes: The first crushing step involves crushing the waste concrete blocks to obtain crushed material with a particle size of 5mm-30mm. The second crushing step involves subjecting the biomass waste to a second crushing process to obtain a second crushed material with a particle size of 12.5µm-25µm. The first crushed material and the second crushed material are mixed to form the crushed material.
[0007] According to any of the foregoing embodiments of this application, the mass ratio of the first crushed material to the second crushed material is (5-10):1.
[0008] According to any of the foregoing embodiments of this application, in the impregnation process, the first strain includes at least one of Trichoderma, Aspergillus, and Penicillium.
[0009] According to any of the foregoing embodiments of this application, in the impregnation process, the second strain includes at least one of Proteobacterium, Bacteroides, and Actinomycetes.
[0010] According to any of the foregoing embodiments of this application, the ratio of the concentration C1 of the first strain in the compound bacterial solution to the concentration C2 of the second strain in the compound bacterial solution is (1-10):1.
[0011] According to any of the foregoing embodiments of this application, the concentration C1 of the first strain in the composite bacterial solution is 10. 20 cfu / mL-10 30 cfu / mL.
[0012] According to any of the foregoing embodiments of this application, the concentration C2 of the second strain in the composite bacterial solution is 10. 18 cfu / mL-10 25 cfu / mL.
[0013] According to any of the foregoing embodiments of this application, the impregnation time of the impregnation process is 2-5 days, and the processing time of the regeneration process is 3-6 days.
[0014] According to any of the foregoing embodiments of this application, the solid-liquid ratio of the crushed material and the composite bacterial solution is (60-150) mL: 1 kg.
[0015] This application provides a method for recycling solid waste, comprising: a pretreatment step, in which the solid waste is pretreated to obtain crushed material, wherein the solid waste includes waste concrete blocks and biomass waste containing lignocellulose; an impregnation step, in which the crushed material is impregnated in a composite bacterial solution to obtain a slurry, wherein the composite bacterial solution includes a first strain capable of releasing cellulase and a second strain capable of releasing carbonic anhydrase; a recycling step, in which the slurry is mixed with a calcium salt solution to obtain recycled aggregate; and a mixing step, in which the recycled aggregate is stirred and mixed with cement to obtain recycled concrete. In the above technical solution, by pretreating, impregnating, and recycling solid waste including waste concrete blocks and biomass waste containing lignocellulose, the obtained recycled aggregate has a low water absorption rate and crushing index. Further mixing reduces the cost of the recycled concrete and also gives it good mechanical properties.
[0016] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description
[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. In the drawings: Figure 1 A schematic flowchart of a solid waste recycling method provided in some embodiments of this application is shown.
[0018] Figure 2 A schematic flowchart of a method for recycling solid waste provided in other embodiments of this application is shown. Detailed Implementation
[0019] In this document, the terms “a,” “the,” “at least one,” and “one or more” are used interchangeably. Thus, for example, a coating composition containing “a” additional additive can be interpreted as meaning that the coating composition contains “one or more” additional additives.
[0020] For simplicity, this paper discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form an undefined range; and any lower limit can be combined with other lower limits to form an undefined range, just as any upper limit can be combined with any other upper limit to form an undefined range. Furthermore, although not explicitly stated, every point or individual value between the endpoints of a range is included within that range. Therefore, each point or individual value can serve as its own lower or upper limit and be combined with any other point or individual value, or with other lower or upper limits, to form an undefined range.
[0021] The foregoing description of this invention is not intended to describe every disclosed embodiment or implementation. Instead, the following description provides more specific examples of exemplary embodiments. Throughout the application, guidance is provided through a series of embodiments that can be used in various combinations. In each instance, the enumeration is merely representative and should not be construed as exhaustive.
[0022] Please see Figure 1 As shown in the embodiment of this application, a method for recycling solid waste is provided, including: S100, Pre-treatment process, pre-treating solid waste to obtain crushed material, wherein the solid waste includes waste concrete blocks and biomass waste containing lignocellulose; S200, Impregnation process, in which the crushed material is impregnated in a compound bacterial solution to obtain a slurry, wherein the compound bacterial solution includes a first strain capable of releasing cellulase and a second strain capable of releasing carbonic anhydrase. S300, the recycling process, involves mixing the slurry with a calcium salt-containing solution to obtain recycled aggregate; S400, the mixing process, involves mixing recycled aggregates and cement to obtain recycled concrete.
[0023] The solid waste recycling method provided in this application involves attaching a first strain capable of releasing cellulase and a second strain capable of releasing carbonic anhydrase to the surface of the crushed material through an impregnation process. The cellulase released by the first strain can promote the decomposition of lignocellulose in biomass waste to form carbon dioxide, while the second strain can further convert carbon dioxide into carbonate. In the recycling process, the carbonate can combine with calcium in calcium salts to form calcium carbonate, which is deposited on the surface, pores, and cracks of the crushed concrete particles. This results in recycled aggregate with low water absorption, crushing index, and porosity. When mixed with cement, the resulting recycled concrete exhibits good mechanical properties.
[0024] Therefore, the above technical solution pre-treats, impregnates, and regenerates solid waste, including waste concrete blocks and biomass waste containing lignocellulose. The resulting recycled aggregate has a low water absorption rate and crushing index. After further mixing, the cost of the recycled concrete can be reduced, and the recycled concrete can also have good mechanical properties.
[0025] In one possible implementation, biomass waste may include at least one of straw, rice husks, stems, and leaves. These biomass wastes contain a high amount of lignocellulose and are readily available, further reducing recycling costs.
[0026] In the embodiments of this application, solid waste can be pretreated to obtain crushed material of the required particle size according to actual application needs.
[0027] Please see Figure 2 As shown, in one possible implementation, the pretreatment step of S100 includes: S110, First crushing step: The waste concrete blocks are subjected to first crushing treatment to obtain first crushed material with a particle size of 5mm-30mm. S120, Second crushing step, the biomass waste is subjected to a second crushing process to obtain a second crushed material with a particle size of 12.5µm-25µm; The first crushed material and the second crushed material are mixed to form the crushed material.
[0028] In the above embodiments, instruments well known in the art, such as ultrafine pulverizers, can be used for crushing. Crushing waste concrete yields a first batch of crushed material with a particle size of 5mm-30mm, which helps improve the compressive strength and modulus of elasticity of the recycled concrete. Crushing biomass waste yields a second batch of crushed material with a particle size of 12.5µm-25µm, which helps improve the compressive strength of the recycled concrete and reduce its crushing index.
[0029] For example, the particle size of the first crushed material may be, but is not limited to, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, or any combination of two of the above values. For instance, the particle size range of the first crushed material may be 5 mm-10 mm, 10 mm-20 mm, or 20 mm-30 mm.
[0030] The particle size of the second crushed material may be, but is not limited to, 12.5µm, 13µm, 13.5µm, 14µm, 14.5µm, 15µm, 15.5µm, 16µm, 16.5µm, 17µm, 17.5µm, 18µm, 18.5µm, 19µm, 19.5µm, 20µm, 20.5µm, 21µm, 21.5µm, 22µm, 22.5µm, 23µm, 23.5µm, 24µm, 24.5µm, 25µm, or any two of the above values.
[0031] In one possible implementation, the mass ratio of the first crushed material to the second crushed material is (5-10):1. A mass ratio of the first crushed material to the second crushed material within the aforementioned range can facilitate the formation and deposition of calcium carbonate in the first crushed material, while also contributing to an increase in the elastic modulus of the recycled concrete.
[0032] In one possible implementation, during the impregnation process, the first strain includes at least one of the genera Trichoderma, Aspergillus, and Penicillium.
[0033] In one possible implementation, during the impregnation process, the second strain includes at least one of the genera Proteobacterium, Bacteroides, and Actinomycetes.
[0034] In one possible implementation, the ratio of the concentration C1 of the first strain in the compound bacterial solution to the concentration C2 of the second strain in the compound bacterial solution is (1-10):1.
[0035] In one possible implementation, the concentration C1 of the first strain in the compound bacterial solution is 10. 20 cfu / mL-10 30 cfu / mL.
[0036] In one possible implementation, the concentration C2 of the second strain in the compound bacterial solution is 10. 18 cfu / mL-10 25 cfu / mL.
[0037] In one possible implementation, the immersion time of the immersion process is 2-5 days, and the processing time of the regeneration process is 3-6 days.
[0038] In one possible implementation, the solid-liquid ratio of the crushed material and the composite bacterial solution is (60-150) mL: 1 kg. Example
[0039] The following embodiments describe the disclosure of this application in more detail. These embodiments are merely illustrative, as various modifications and variations will be apparent to those skilled in the art within the scope of the disclosure of this application. Unless otherwise stated, all parts, percentages, and ratios reported in the following embodiments are based on weight, and all reagents used in the embodiments are commercially available and ready for use without further processing. Example
[0040] This embodiment provides a method for recycling solid waste, including the following steps: 5 kg of waste concrete and 1 kg of corn stalks were crushed to obtain 10 mm waste concrete crushed material and 15 µm corn stalk crushed material. Waste concrete fragments and corn stalk fragments were soaked in 600 mL of a compound bacterial solution for 3 days to obtain a slurry. The concentration of Trichoderma in the compound bacterial solution was 10. 20 cfu / mL, Proteobacterium concentration was 10 19 cfu / mL; The above slurry was mixed with an aqueous solution containing 25 g / L calcium nitrate and 0.5 g / L glucose and treated for 4 days to obtain recycled aggregate. The recycled aggregate, cement, and water are mixed in a mass ratio of 4:2:1 to obtain recycled concrete. Example
[0041] This embodiment provides a method for recycling solid waste, including the following steps: 12 kg of waste concrete and 2 kg of corn stalks were crushed to obtain 10 mm waste concrete crushed material and 15 µm corn stalk crushed material. Waste concrete fragments and corn stalk fragments were soaked in 1080 mL of a compound bacterial solution for 3 days to obtain a slurry. The concentration of Trichoderma in the compound bacterial solution was 10. 20 cfu / mL, Proteobacterium concentration was 10 19 cfu / mL; The above slurry was mixed with an aqueous solution containing 25 g / L calcium nitrate and 0.5 g / L glucose and treated for 4 days to obtain recycled aggregate. The recycled aggregate, cement, and water are mixed in a mass ratio of 4:2:1 to obtain recycled concrete. Example
[0042] This embodiment provides a method for recycling solid waste, including the following steps: 14 kg of waste concrete and 2 kg of corn stalks were crushed to obtain 10 mm waste concrete crushed material and 15 µm corn stalk crushed material. Waste concrete fragments and corn stalk fragments were soaked in 980 mL of a compound bacterial solution for 3 days to obtain a slurry. The concentration of Trichoderma in the compound bacterial solution was 10. 20 cfu / mL, Proteobacterium concentration was 10 19 cfu / mL; The above slurry was mixed with an aqueous solution containing 25 g / L calcium nitrate and 0.5 g / L glucose and treated for 4 days to obtain recycled aggregate. The recycled aggregate, cement, and water are mixed in a mass ratio of 4:2:1 to obtain recycled concrete. Example
[0043] This embodiment provides a method for recycling solid waste, including the following steps: 5 kg of waste concrete and 1 kg of corn stalks were crushed to obtain 10 mm waste concrete crushed material and 15 µm corn stalk crushed material. Waste concrete fragments and corn stalk fragments were soaked in 600 mL of a compound bacterial solution for 3 days to obtain a slurry. The concentration of Trichoderma in the compound bacterial solution was 10. 25 cfu / mL, Proteobacterium concentration was 10 24 cfu / mL; The above slurry was mixed with an aqueous solution containing 25 g / L calcium nitrate and 0.5 g / L glucose and treated for 4 days to obtain recycled aggregate. The recycled aggregate, cement, and water are mixed in a mass ratio of 4:2:1 to obtain recycled concrete. Example
[0044] This embodiment provides a method for recycling solid waste, including the following steps: 5 kg of waste concrete and 1 kg of corn stalks were crushed to obtain 10 mm waste concrete crushed material and 15 µm corn stalk crushed material. Waste concrete fragments and corn stalk fragments were soaked in 600 mL of a compound bacterial solution for 3 days to obtain a slurry. The concentration of Trichoderma in the compound bacterial solution was 8 × 10⁻⁶. 20 cfu / mL, Proteobacterium concentration was 10 20 cfu / mL; The above slurry was mixed with an aqueous solution containing 25 g / L calcium nitrate and 0.5 g / L glucose and treated for 4 days to obtain recycled aggregate. The recycled aggregate, cement, and water are mixed in a mass ratio of 4:2:1 to obtain recycled concrete. Example
[0045] This embodiment provides a method for recycling solid waste, including the following steps: 5 kg of waste concrete and 1 kg of corn stalks were crushed to obtain 10 mm waste concrete crushed material and 15 µm corn stalk crushed material. Waste concrete fragments and corn stalk fragments were soaked in 600 mL of a compound bacterial solution for 3 days to obtain a slurry. The concentration of Trichoderma in the compound bacterial solution was 2 × 10⁻⁶. 20 cfu / mL, Proteobacterium concentration was 10 20 cfu / mL; The above slurry was mixed with an aqueous solution containing 25 g / L calcium nitrate and 0.5 g / L glucose and treated for 4 days to obtain recycled aggregate. The recycled aggregate, cement, and water are mixed in a mass ratio of 4:2:1 to obtain recycled concrete.
[0046] This comparative example provides a method for recycling solid waste, including the following steps: 5 kg of waste concrete was crushed to obtain 10 mm waste concrete fragments. Waste concrete fragments were soaked in 600 mL of a compound bacterial solution for 3 days to obtain a slurry. The concentration of Trichoderma in the compound bacterial solution was 10. 25 cfu / mL, Proteobacterium concentration was 10 24 cfu / mL; The above slurry was mixed with an aqueous solution containing 25 g / L calcium nitrate and 0.5 g / L glucose and treated for 4 days to obtain recycled aggregate. The recycled aggregate, cement, and water are mixed in a mass ratio of 4:2:1 to obtain recycled concrete.
[0047] This comparative example provides a method for recycling solid waste, including the following steps: 5 kg of waste concrete and 1 kg of corn stalks were crushed to obtain 10 mm waste concrete crushed material and 15 µm corn stalk crushed material. Waste concrete fragments and corn stalk fragments were soaked in 600 mL of a compound bacterial solution for 3 days to obtain a slurry. The concentration of Trichoderma in the compound bacterial solution was 10. 20 cfu / mL; The above slurry was mixed with an aqueous solution containing 25 g / L calcium nitrate and 0.5 g / L glucose and treated for 4 days to obtain recycled aggregate. The recycled aggregate, cement, and water are mixed in a mass ratio of 4:2:1 to obtain recycled concrete.
[0048] This comparative example provides a method for recycling solid waste, including the following steps: 5 kg of waste concrete and 1 kg of corn stalks were crushed to obtain 10 mm waste concrete crushed material and 15 µm corn stalk crushed material. Waste concrete fragments and corn stalk fragments were soaked in 600 mL of a compound bacterial solution for 3 days to obtain a slurry. The concentration of Trichoderma in the compound bacterial solution was 10. 20 cfu / mL; The above slurry was mixed with an aqueous solution containing 25 g / L calcium nitrate and 0.5 g / L glucose and treated for 4 days to obtain recycled aggregate. The recycled aggregate, cement, and water are mixed in a mass ratio of 4:2:1 to obtain recycled concrete.
[0049] The samples provided in Examples 1-6 and Comparative Examples 1-3 were subjected to various performance tests. The test methods for water absorption and crushing index are as specified in national standard JGJ 52-2006, and the test methods for compressive strength, splitting strength and elastic modulus are as specified in national standard GB / T 50081-2002. The test results are shown in Table 1. Table 1 Test results of Examples 1-6 and Comparative Examples 1-3 Serial Number Water absorption rate Crushing index compressive strength Splitting strength elastic modulus Example 1 4.2% 16.1% 59.6 MPa 4.2MPa 40.3 GPa Example 2 4.3% 16.6% 58.3 MPa 4.0MPa 38.9 GPa Example 3 4.5% 16.9% 56.1 MPa 3.8MPa 37.3 GPa Example 4 3.9% 15.2% 60.8 MPa 4.5MPa 42.1 GPa Example 5 4.0% 15.8% 59.9MPa 4.3MPa 41.2 GPa Example 6 4.1% 16.0% 59.8 MPa 4.25MPa 40.7 GPa Comparative Example 1 9.4% 21.5% 31.8MPa 2.2MPa 20.4 GPa Comparative Example 2 7.3% 19.8% 35.2 MPa 3.0MPa 28.6 GPa Comparative Example 3 6.9% 18.4% 39.6 MPa 3.3MPa 30.2 GPa As shown in Table 1, in the solid waste recycling method provided in the embodiments of this application, the above technical solution pre-treats, impregnates and regenerates solid waste including waste concrete blocks and biomass waste containing lignocellulose. The resulting recycled aggregate has a low water absorption rate and crushing index. After mixing, the cost of the recycled concrete can be reduced and the recycled concrete can also have good mechanical properties.
[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A method of recycling solid waste material, characterized by, The application relates to a method for recycling solid waste. The method comprises the following steps: a pretreatment step of pretreating the solid waste to obtain crushed materials, wherein the solid waste comprises waste concrete blocks and biomass waste containing lignocellulose; an immersion step of immersing the crushed materials in a composite bacterial solution to obtain slurry, wherein the composite bacterial solution comprises a first bacterial strain capable of releasing cellulase and a second bacterial strain capable of releasing carbonic anhydrase; a regeneration step of mixing the slurry and a calcium salt solution to obtain regenerated aggregate; 2. The regeneration method according to claim 1, characterized by, a mixing step of stirring and mixing the regenerated aggregate and cement to obtain recycled concrete. The pretreatment step comprises: a first crushing step of performing first crushing treatment on the waste concrete blocks to obtain first crushed materials with a particle size of 5mm-30mm; a second crushing step of performing second crushing treatment on the biomass waste to obtain second crushed materials with a particle size of 12.5mu m-25mu m; 3. The regeneration method according to claim 2, characterized by, wherein the first crushed materials and the second crushed materials are mixed to form the crushed materials.
4. The regeneration method according to claim 1, characterized by, The mass ratio of the first crushed materials to the second crushed materials is (5-10):
1.
5. The regeneration method according to claim 1, characterized by, In the immersion step, the first bacterial strain comprises at least one of Trichoderma, Aspergillus and Penicillium.
6. The regeneration method according to claim 1, characterized by, In the immersion step, the second bacterial strain comprises at least one of Proteus, Bacteroides and Actinomyces.
7. The regeneration method according to claim 6, characterized by, The concentration C1 of the first strain in the complex bacteria solution is 10 20 cfu / mL-10 30 cfu / mL.
8. The regeneration method according to claim 6, characterized by, The concentration C2 of the second strain in the complex bacteria solution is 10 18 cfu / mL-10 25 cfu / mL.
9. The regeneration method according to claim 1, characterized by, The concentration C1 of the first bacterial strain in the composite bacterial solution and the concentration C2 of the second bacterial strain in the composite bacterial solution are in a ratio of (1-10):
1.
10. The regeneration method according to claim 1, characterized by, The immersion time of the immersion step is 2d-5d, and the treatment time of the regeneration step is 3d-6d. The solid-liquid ratio of the crushed materials to the composite bacterial solution is (60-150)mL:1kg.