A method for accelerating the soil formation of concrete solid waste

Abstract

The application discloses a method for accelerating soil formation of concrete solid waste, and belongs to the technical field of solid waste treatment and resource utilization. The method is realized through the following steps: (1) crushing and screening the concrete solid waste; (2) adding a salt solution to the crushed concrete blocks, and performing soaking / drainage circulation; (3) performing secondary crushing and screening on the concrete solid waste corroded and weathered by salt, and recovering the oversize material; (4) adding silicate bacteria to the undersize material; and (5) adding fungi and green manure plants. The method can accelerate weathering and pulverization of the concrete solid waste by corroding the concrete through salt, reduce the structural strength of the concrete solid waste, separate and recover sand and stone materials resistant to weathering through secondary crushing and screening of weathering products of the concrete solid waste, accelerate mineral weathering and stabilization of the undersize material by adding silicate bacteria, improve the air permeability, soil conservation and fertilizer storage performance of the weathering products of the concrete by adding fungi and green manure plants, and realize accelerated soil formation of the concrete solid waste.

Description

Technical Field

[0001] This invention belongs to the field of solid waste treatment and resource utilization technology, specifically relating to a method for accelerating the conversion of concrete solid waste into soil. Background Technology

[0002] Construction waste is a general term for waste generated during the construction, renovation, and demolition of various buildings, structures, pipelines, roads, bridges, and home renovations. Concrete solid waste is the main solid waste generated after concrete reaches its service life and is demolished, accounting for 60% to 70% of the total construction solid waste. It is estimated that my country generates approximately 6 × 10⁶ tons of construction waste annually. 8 t Concrete solid waste.

[0003] Currently, the treatment and disposal methods for concrete solid waste include on-site utilization, centralized disposal, stockpiling and landfilling, and production of resource-based products. Among these, the resource utilization of concrete solid waste mostly involves recycling it in the form of recycled aggregates. In engineering projects, on-site or centralized disposal methods are commonly used to produce recycled aggregates from the generated concrete solid waste; these recycled aggregates are then used in various construction projects. However, this method has a low resource utilization rate, resulting in poor environmental benefits. Furthermore, the stockpiling and landfilling of waste concrete occupies land, leading to ecological damage and the waste of resources such as aggregates from construction solid waste. Therefore, there is an urgent need to develop a new technology for the resource utilization of concrete solid waste, improve the resource utilization rate, reduce ecological damage, and provide technical support for the large-scale disposal and resource utilization of bulk solid waste.

[0004] Currently, the soil conversion of bulk solid waste has become a research trend. Concrete solid waste contains a structural framework of gravel and other sand and gravel, as well as a mineral aggregate composed of silicate minerals. It is difficult to weather under natural conditions. Based on the theory of mineral weathering into soil and corrosion, this invention proposes a new technology for the resource utilization of concrete solid waste. Summary of the Invention

[0005] In response to the need for resource utilization and ecological protection of concrete solid waste, this invention proposes a method for accelerating the soil formation of concrete solid waste.

[0006] Invention principle: By corroding concrete with salt, the structural strength of concrete solid waste is reduced, accelerating its weathering and pulverization; by secondary crushing and screening of the weathered products of concrete solid waste, weather-resistant sand and gravel are separated and recovered; by adding silicate bacteria to the undersize material, the mineral weathering and stabilization are accelerated; by adding fungi and green manure plants, the air permeability, moisture retention and fertilizer storage performance of concrete weathered products are improved, thus accelerating the transformation of concrete solid waste into soil.

[0007] This invention is achieved through the following technical solution:

[0008] (1) Crushing and screening concrete solid waste;

[0009] (2) Add sulfate solution to the crushed concrete fragments and repeat the soaking-draining cycle.

[0010] (3) The concrete solid waste that has been weathered by salt corrosion is subjected to secondary crushing and screening to recover the material on the screen.

[0011] (4) Add silicate bacteria to the sieved material;

[0012] (5) Add fungi and green manure plants to accelerate the transformation of concrete solid waste into soil.

[0013] Preferably, in step (1), the particle size of the concrete solid waste after crushing and screening is 40~150mm.

[0014] Preferably, in step (2), the salt solution is one or a combination of sulfate, chloride, and nitrate.

[0015] Preferably, in step (2), the anion mass concentration of the salt solution is 0.1% to 20%.

[0016] Preferably, in step (2), the number of soaking / draining cycles is 1 to 80, the soaking time is 1 to 24 hours each time, and the draining time is 1 to 24 hours each time.

[0017] Preferably, in step (3), the particle size of the material on the sieve is 10~40mm.

[0018] Preferably, in step (4), the type of silicate bacteria is Bacillus mucilaginosus (Bacillus mucilaginosus). Bacillus mucilaginous Krassilnikov ), Bacillus circularis ( Circulating Bacillus ), Polymyxin Bacillus ( Paenibacillus polymyxa ), soil Bacillus ( Soil Bacillus ), Soil-borne empty cluster bacteria ( Cenococcus geophilus One or more combinations of ).

[0019] Preferably, in step (5), the fungus is Aspergillus niger (…). Black aspergillus ), Ectomycorrhizal fungi ( Ectomycorrhizal fungi ), Aspergillus fumigatus ( Aspergillus fumigatus ), small black mold ( Penicillium spiny ), Basilella Talaromyces sp. One or more combinations of )

[0020] Preferably, in step (5), the green manure plant types are Amorpha fruticosa, Caragana, Astragalus, Osmanthus, Sophora, and Sesbania.

[0021] Compared with existing technologies, the advantages of this invention are:

[0022] (1) By using salt to weather and corrode concrete solid waste, the structural strength of weathering products is significantly reduced, thus reducing the energy consumption of solid waste crushing.

[0023] (2) By selectively screening the weathering products, difficult-to-weather stones such as pebbles can be recovered.

[0024] (3) By improving the air permeability, moisture retention and fertilizer storage performance of concrete solid waste weathering products, large-scale disposal and soil utilization of concrete solid waste can be realized. Attached Figure Description

[0025] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0026] The present invention will be further described below with reference to embodiments, but this is not intended to limit the present invention in any way. Any modifications or substitutions made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0027] Example 1:

[0028] (1) The concrete solid waste is crushed and screened to obtain concrete solid waste with a particle size of 40~150mm;

[0029] (2) Add a sulfate solution with an anionic mass concentration of 0.1% to 2% to the crushed concrete fragments, and perform alternating soaking and draining cycles, 1 to 10 times, with each soaking time lasting 1 to 4 hours and each draining time lasting 1 to 4 hours.

[0030] (3) Concrete solid waste that has been weathered by salt corrosion is subjected to secondary crushing and screening to recover the material on the screen with a particle size of 10~40mm.

[0031] (4) Add Bacillus subtilis ( ) to the sieve undersize material. Bacillus mucilaginous Krassilnikov );

[0032] (5) Add Aspergillus niger to the sieve residue ( Black aspergillus );

[0033] (6) Add Amorpha genus to the sieved material.

[0034] Example 2:

[0035] (1) The concrete solid waste is crushed and screened to obtain concrete solid waste with a particle size of 40~150mm;

[0036] (2) Add a 2%~5% anion sulfate solution to the crushed concrete fragments and repeat the soaking-draining cycle 10~20 times, with each soaking lasting 4~8 hours and each draining lasting 4~8 hours.

[0037] (3) Concrete solid waste that has been weathered by salt corrosion is subjected to secondary crushing and screening to recover the material on the screen with a particle size of 10~40mm.

[0038] (4) Add Bacillus circulatoryus (Bc. circulatoryus) to the sieve undersize. Circulating Bacillus );

[0039] (5) Add Aspergillus fumigatus to the sieve undersize material ( Aspergillus fumigatus );

[0040] (6) Add Astragalus membranaceus to the sieved material.

[0041] Example 3:

[0042] (1) The concrete solid waste is crushed and screened to obtain concrete solid waste with a particle size of 40~150mm;

[0043] (2) Add a 5%~10% anion sulfate solution to the crushed concrete fragments and repeat the soaking-draining cycle 20~40 times, with each soaking lasting 8~12 hours and each draining lasting 8~12 hours.

[0044] (3) Concrete solid waste that has been weathered by salt corrosion is subjected to secondary crushing and screening to recover the material on the screen with a particle size of 10~40mm.

[0045] (4) Add Polymyxin Bacillus (PMP) to the sieve undersize material. Paenibacillus polymyxa ) and soil Bacillus ( Soil Bacillus );

[0046] (5) Add ectomycorrhizal fungi to the sieved material ( Ectomycorrhizal fungi ) and small black mold ( Penicillium spinulosum );

[0047] (6) Add Astragalus membranaceus to the sieved material.

[0048] Example 4:

[0049] (1) The concrete solid waste is crushed and screened to obtain concrete solid waste with a particle size of 40~150mm;

[0050] (2) Add a sulfate solution with an anionic mass concentration of 10%~15% to the crushed concrete fragments and perform alternating soaking and draining cycles, 40~60 times, with each soaking time lasting 12~18 hours and each draining time lasting 12~18 hours.

[0051] (3) Concrete solid waste that has been weathered by salt corrosion is subjected to secondary crushing and screening to recover the material on the screen with a particle size of 10~40mm.

[0052] (4) Add Bacillus subtilis ( ) to the sieve undersize material. Bacillus mucilaginous Krassilnikov ), soil Bacillus ( Soil Bacillus ) and terrestrial empty mass bacteria ( Cenococcus geophilus );

[0053] (5) Add Aspergillus niger to the sieve residue ( Black aspergillus Aspergillus fumigatus ( ) Aspergillus fumigatus ) and small black mold ( Penicillium spinulosum );

[0054] (6) Add pig manure beans to the sieved material.

[0055] Example 5:

[0056] (1) The concrete solid waste is crushed and screened to obtain concrete solid waste with a particle size of 40~150mm;

[0057] (2) Add a sulfate solution with an anionic mass concentration of 15%~20% to the crushed concrete fragments and perform alternating soaking and draining cycles, 60~80 times, with each soaking time lasting 18~24 hours and each draining time lasting 18~24 hours.

[0058] (3) Concrete solid waste that has been weathered by salt corrosion is subjected to secondary crushing and screening to recover the material on the screen with a particle size of 10~40mm.

[0059] (4) Add Bacillus subtilis ( ) to the sieve undersize material. Bacillus mucilaginous Krassilnikov ), Bacillus circularis ( Circulating Bacillus ), Polymyxin Bacillus ( Paenibacillus polymyxa ) and soil Bacillus ( Soil Bacillus );

[0060] (5) Add ectomycorrhizal fungi to the sieved material ( Ectomycorrhizal fungi ), Aspergillus fumigatus ( Aspergillus fumigatus ), small black mold ( Penicillium spinulosum ) and basket bacteria ( Talaromyces sp. );

[0061] (6) Add sessile to the sieved material.

Claims

1. A method for accelerating the conversion of concrete solid waste into soil, characterized by the following steps: (1) Crushing and screening concrete solid waste; (2) Add salt solution to the broken concrete fragments and repeat the soaking-draining cycle. (3) The concrete solid waste that has been weathered by salt corrosion is subjected to secondary crushing and screening to recover the material on the screen. (4) Add silicate bacteria to the sieved material; (5) Add fungi and green manure plants to accelerate the transformation of concrete solid waste into soil; after the silicate minerals have weathered and stabilized, add fungi and green manure plants, the type of fungi being Aspergillus niger ( Asperillus niger ), Ectomycorrhizal fungi ( Ectomycorrhizal fungi ), Aspergillus fumigatus ( Aspergillus fumigatus ), small black mold ( Penicillium spinulosum ), Basilella Talaromyces sp. One or more combinations of the following: the types of green manure plants to be added are Amorpha fruticosa, Caragana, Astragalus, Osmanthus, Lepidium, and Sesbania.

2. The method for accelerating the conversion of concrete solid waste into soil according to claim 1, characterized in that... The particle size of the concrete solid waste in step (1) after crushing and screening is 40~150mm.

3. The method for accelerating the conversion of concrete solid waste into soil according to claim 1, characterized in that... The salt solution added in step (2) is one or a combination of sulfate, chloride, and nitrate.

4. The method for accelerating the conversion of concrete solid waste into soil according to claim 1, characterized in that... In step (2), the anion concentration of the added salt solution is 0.1% to 20%.

5. The method for accelerating the conversion of concrete solid waste into soil according to claim 1, characterized in that... In step (2), the soaking / draining cycle is 1 to 80 times, the soaking time is 1 to 24 hours each time, and the draining time is 1 to 24 hours each time.

6. The method for accelerating the conversion of concrete solid waste into soil according to claim 1, characterized in that... In step (3), the particle size of the material recovered after secondary crushing and screening is 10~40mm.

7. The method for accelerating the conversion of concrete solid waste into soil according to claim 1, characterized in that... In step (4), the type of silicate bacteria added to the sieve undersize is Bacillus mucilaginosus (Bacillus mucilaginosus). Bacillus mucilaginosus Krassilnikov ), Bacillus circularis ( Bacillus circulans ), Polymyxin Bacillus ( Paenibacillus polymyxa ), soil Bacillus ( Bacilluse edaphicus ), Soil-borne empty cluster bacteria ( Cenococcum geophilum One or more combinations of ).

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