A method and device for coordinated treatment of garden solid waste and construction solid waste

Abstract

The present invention relates to a method and device for the coordinated treatment of garden solid waste and construction solid waste, and the treatment method includes: S1, garden solid waste is first sorted to obtain leaves and branches; leaves are squeezed to obtain squeezed liquid and squeezed residue; S2, construction solid waste is sorted to obtain wood components and inorganic components; S3, branches and wood components are mixed and crushed and then pyrolyzed and carbonized to obtain biochar; biochar is mixed with squeezed liquid and heated to obtain loaded modified biochar; S4, after the inorganic component is crushed, the residual material after magnetic separation is screened to obtain <1mm fine ash soil and mixed with loaded modified biochar to obtain mixed modified nutrient soil. The present invention utilizes garden waste and construction waste to produce high-quality modified nutrient soil through coordinated treatment, solves the problems of rapid reduction of garden branches, difficulty in composting leaves, and difficulty in utilizing fine ash soil in construction, fully embodies the concept of circular economy and clean production, and has good economic and environmental benefits.

Description

Technical Field

[0001] The present invention belongs to the technical field of garden solid waste and construction solid waste treatment, and in particular relates to a method and device for coordinated treatment of garden solid waste and construction solid waste. Background Art

[0002] With the rapid development of the economy and society, people have higher and higher requirements for living standards and quality. my country's urbanization process has accelerated rapidly, the scale of urban housing construction has expanded, and the amount of new construction, reconstruction, expansion and demolition of projects has continued to increase, resulting in a large amount of construction waste, which has caused many inconveniences to people's lives. In the process of urbanization and urban renewal, a large amount of abandoned construction sludge, slag and solid waste will be generated. These construction wastes are the main components of urban garbage, accounting for about 30%-40% of the total amount of urban garbage. The stacking and landfilling of construction waste not only occupies a large amount of land, but also pollutes water, air and soil, seriously affecting the city appearance and environmental sanitation. In addition, the slag spillage and the flying of dust and ash sand during the transportation and stacking process cause secondary pollution to the urban air, directly or indirectly affecting the air quality.

[0003] On the other hand, with the development of cities and the improvement of living standards, the amount of garden waste such as dead branches, fallen leaves, and withered flowers generated in the process of greening maintenance, plant pruning and processing operations is huge. The traditional methods of garden waste treatment are landfill, incineration, and disposal. The traditional treatment methods can no longer meet the requirements of large-scale treatment and the goal of low-carbon disposal at this stage. The greening waste composting technology uses dead branches, fallen leaves, withered flowers and grass clippings as composting raw materials. Under the basic conditions of meeting the growth and reproduction of microorganisms, after a period of aerobic fermentation, the organic matter is degraded and converted into humus or organic nutrients to obtain the final mature compost product for resource utilization; but due to the high cellulose content in fallen leaves and the difficulty in degradation, the composting cycle is generally long, which limits the large-scale composting of fallen leaves. Overall, the greening waste composting process has problems such as slow temperature rise, long cycle, poor quality of compost products, easy odor, and nutrient loss. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing separate treatment of garden solid waste and construction solid waste, such as high cost, limited product resource utilization, and long treatment cycle, and to provide a method and device for the coordinated treatment of garden solid waste and construction solid waste.

[0005] In view of the current status of garden solid waste and construction solid waste treatment, the present invention develops a technology for the coordinated treatment of two types of solid waste and their conversion into high value-added products, which can not only reduce the treatment cost of landscaping, but also realize the resource utilization of construction waste, greatly save resources, achieve the goal of low-carbon treatment, and will produce significant social, economic and environmental benefits.

[0006] Specifically, the present invention provides a method for co-processing garden solid waste and construction solid waste, the method comprising:

[0007] S1. Garden solid waste is first sorted to obtain leaves and branches; the leaves are squeezed to obtain squeezed liquid and squeezed residue;

[0008] S2, sorting construction solid waste to obtain wood components and inorganic components;

[0009] S3, the branches and wood components are mixed and crushed, and then mixed with the pressed residue obtained in S1 for pyrolysis and carbonization treatment to obtain biochar; the biochar is mixed with the pressed liquid obtained in S1, and heated by the waste heat of hot flue gas to promote the decomposition of organic matter and the growth of microorganisms to obtain loaded modified biochar;

[0010] S4. After the inorganic components are crushed, the iron-containing components obtained by magnetic separation are recycled; the residual materials after magnetic separation are sieved to obtain granular materials ≥1mm for use as raw materials for building materials; the obtained fine ash soil <1mm is mixed with the loaded modified biochar to obtain modified nutrient soil.

[0011] Furthermore, in step S3, the pyrolysis temperature is 600°C to 800°C; the pyrolysis time is 30 to 60 minutes; the combustible gas produced by the pyrolysis is used as fuel in the pyrolysis process to achieve self-sufficiency of system energy. Preferably, the weight mixing ratio of biochar to squeezed liquid is 1: (0.5 to 2).

[0012] Furthermore, in step S3, the flue gas exhaust is used to heat the squeezed liquid to load the modified biochar, promote the decomposition of organic matter and the growth of microorganisms, and finally purify the flue gas to achieve standard emission.

[0013] Furthermore, in step S4, the mixing ratio of fine ash soil and loaded modified biochar is (2-5):1; the modified nutrient soil obtained after mixing and modification is suitable for soil remediation, mine greening, greening soil and other purposes.

[0014] In addition, the present invention also provides a device for the coordinated treatment of garden solid waste and construction solid waste, including: a sorting device 1#, a conveying device 1#, a crushing device 1#, a conveying device 2#, a pressing and dehydrating device, a conveying device 3#, a conveying device 4#, a pyrolysis device, a combustion device, a cooling device, a conveying device 5#, a biochar loading device, a conveying device 6#, a conveying device 7#, a purification and emission device, a sorting device 2#, a crushing device 2#, a conveying device 8#, a conveying device 9#, a magnetic separation device, a screening device, a conveying device 10#, a conveying device 11#, a conveying device 12#, a conveying device 13#, and a mixing and modification device.

[0015] The device connection sequence is as follows:

[0016] The branch outlet of sorting device 1# is connected to the inlet of conveying device 1#; the outlet of conveying device 1# is connected to the crushing device; the outlet of crushing device is connected to conveying device 4#; the outlet of conveying device 4# is connected to the pyrolysis device; the outlet of pyrolysis device is connected to the cooling device; the outlet of cooling device is connected to the inlet of conveying device 5#; the outlet of conveying device 5# is connected to the inlet of biochar loading device; the outlet of biochar loading device is connected to the inlet of conveying device 13#; the outlet of conveying device 13# is connected to the inlet of mixing and modification device;

[0017] The leaf outlet of the sorting device 1# is connected to the inlet of the conveying device 2#; the outlet of the conveying device 2# is connected to the inlet of the pressing and dehydrating device; the outlet of the pressing and dehydrating device is connected to the inlet of the conveying device 6#; the outlet of the conveying device 6# is connected to the inlet of the biochar loading device;

[0018] The wood component outlet of the sorting device 2# is connected to the inlet of the conveying device 8#, and the outlet of the conveying device 8# is connected to the inlet of the crushing device 1#; the inorganic component outlet of the sorting device 2# is connected to the inlet of the crushing device 2#; the outlet of the crushing device 2# is connected to the inlet of the conveying device 9#; and the outlet of the conveying device 9# is connected to the inlet of the magnetic separation device;

[0019] The iron-containing component outlet of the magnetic separation device is connected to the inlet of the conveying device 10#; the outlet of the residual material after magnetic separation is connected to the inlet of the screening device; the outlet of the screening device for granular materials ≥1mm is connected to the inlet of the conveying device 11#; the outlet of the screening device for fine ash <1mm is connected to the inlet of the conveying device 12#; the outlet of the conveying device 12# is connected to the inlet of the mixing and modification device.

[0020] Furthermore, the device for coordinated treatment of garden solid waste and construction solid waste provided by the present invention also includes a pyrolysis gas outlet of a pyrolysis device connected to a fuel inlet of a combustion device, and the hot flue gas of the combustion device is used to heat the heat source of the pyrolysis device; the flue gas exhaust outlet of the pyrolysis device is connected to the inlet of a biochar loading device; the flue gas outlet of the biochar loading device is connected to the inlet of a conveying device 7#; and the outlet of the conveying device 7# is connected to a purification and emission device.

[0021] Furthermore, the sorting device 1# is a conventional air sorting device with a coarse crushing system.

[0022] Furthermore, the conveying device 1#, conveying device 2#, conveying device 3#, conveying device 8#, conveying device 9#, conveying device 10#, and conveying device 11# are belt conveyors.

[0023] Furthermore, the conveying device 4#, conveying device 5#, conveying device 12#, and conveying device 13# are screw conveyors, belt conveyors, or scraper conveyors.

[0024] Furthermore, the crushing device 1# is a shearing crusher.

[0025] Furthermore, the squeezing and dehydrating device is a screw extruder or a high-pressure dehydrator.

[0026] Furthermore, the pyrolysis device is an indirect heating drum-type pyrolysis furnace.

[0027] Furthermore, the combustion device is a coal gas or natural gas combustion furnace.

[0028] Furthermore, the cooling device is an indirect cooling rotary drum, and the cooling medium is cold water or cold air.

[0029] Furthermore, the biochar loading device is a mixing tank or a drum mixer with a stirring device.

[0030] Furthermore, the conveying device 6# is a water pump.

[0031] Furthermore, the conveying device 7# is a flue gas induced draft fan.

[0032] Furthermore, the purification and emission device is a common flue gas and exhaust gas purification system.

[0033] Furthermore, the sorting device 2# is a gravity sorting device or a manual sorting device.

[0034] Furthermore, the crushing device 2# is a jaw crusher, a hammer crusher or a compound crusher.

[0035] Furthermore, the magnetic separation device is a common ferromagnetic separation device.

[0036] Furthermore, the screening device is a vibrating screen or a drum screen.

[0037] Furthermore, the mixing and modifying device is a ribbon mixer or a drum mixer.

[0038] One of the inventive points of the present invention is to solve the problem of high cost and long cycle of lignin recovery in garden waste. The prior art composts garden waste, but lignin is difficult to degrade during the composting process, or requires additional reagents and a long cycle to degrade. Therefore, the present invention uses the organic matter-rich squeezed liquid obtained after squeezing for mixing and modification with biochar, and the residue mainly composed of lignin is mixed with branches and pyrolyzed to prepare biochar, thereby realizing efficient resource utilization of garden waste.

[0039] Another inventive point of the present invention is to solve the problem of recycling fine dust in construction waste. At present, dust <1mm in construction waste is difficult to utilize, and most of it is landfilled. Landfilling does not meet the requirements of green development, which has seriously restricted the development of resource utilization of construction waste. The present invention further mixes dust <1mm with modified biochar to prepare modified nutrient soil, which can achieve efficient coordinated disposal of garden waste and construction waste, not only solving the problem of dust recycling, but also improving the quality of nutrient soil.

[0040] The third inventive point of the present invention is the synergistic combination of garden solid waste and construction solid waste. This includes: 1) separating leaves and branches, squeezing leaves to extract juice for later use, pyrolyzing residues and branches from leaves, and woody raw materials in construction solid waste to form biochar; 2) mixing biochar with juice squeezed from garden leaves, and using pyrolysis flue gas for co-heating to promote organic matter decomposition and microbial growth, and obtain loaded modified biochar; 3) combining loaded modified biochar with construction fine ash to further improve the fineness of biochar and obtain modified nutrient soil. The previous and subsequent steps in the whole process are interrelated, and the materials are fully recycled and utilized in the system without any waste, forming a closed loop.

[0041] The pyrolysis furnace used in the present invention is an indirect heating method, wherein the temperature of the pyrolysis carbonization section is 600-800°C and the material residence time is 30-60 minutes, which can obtain a biochar with good pore structure and functional group distribution. The biochar is mixed with tree squeezed liquid and heated by the waste heat of flue gas to mature, and modified biochar with colony distribution and fertilizer effect can be achieved.

[0042] The present invention fully embodies the concept of circular economy and clean production, has good economic and environmental benefits, and has the following beneficial effects:

[0043] (1) Using garden waste and construction waste as the main raw materials and producing high-quality modified nutrient soil through coordinated processing can solve the problems of rapid reduction of garden branches, difficulty in composting leaves, and difficulty in utilizing fine ash soil in construction.

[0044] (2) The wood components in construction waste are mixed with tree branches and pyrolyzed to produce biochar. The inorganic components ≥1 mm are used as building materials, and the components <1 mm are modified with biochar to produce nutrient soil. The obtained nutrient soil has high content of effective elements such as carbon, nitrogen, phosphorus and potassium, and can be used for soil improvement, mine reforestation or greening planting soil; it can promote plant growth, conserve water resources, solidify heavy metals, enhance plant disease resistance, and reduce maintenance costs, thereby realizing the recycling of resources and creating a good soil ecological microenvironment.

[0045] (3) The organic matter content of the mixture is significantly increased by fully mixing the leaf squeezed liquid with porous biochar. After being decomposed, it has a good microbial community and fertilizer effect, which improves the quality of the nutrient soil. Since biochar has relatively rough particles and a large specific surface area, it provides a good microenvironment for microorganisms. The carboxyl structure is a typical structure of biochar, which can adsorb and retain more cations, increase the CEC value of the porous biochar obtained by the adsorption squeezed liquid, retain more nutrients, and enhance the product quality. Biochar with high porosity can provide a habitat and shelter for heterotrophic aerobic microorganisms, protect the microbial community, avoid competition with other types of microorganisms, increase and ensure the number of heterotrophic aerobic microorganisms; moreover, biochar is also rich in nutrients, especially phosphorus, which can meet the formation of a large amount of ATP required for the reproduction of heterotrophic aerobic microorganisms, regulate their nutrient balance, and lay a good foundation for subsequent mixing with fine ash soil from construction solid waste as nutrient soil.

[0046] (4) The new technology fully realizes the coordinated harmlessness, reduction and resource utilization of garden waste and construction waste, with zero waste discharge, simple process control, and good social, economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic diagram of a device for co-processing garden solid waste and construction solid waste provided by the present invention;

[0048] Figure 2 A process flow chart for the coordinated treatment of garden solid waste and construction solid waste provided by the present invention.

[0049] Description of Reference Numerals

[0050] 1. Sorting device 1#, 2. Conveying device 1#, 3. Crushing device 1#, 4. Conveying device 2#, 5. Pressing and dehydrating device, 6. Conveying device 3#, 7. Conveying device 4#, 8. Pyrolysis device, 9. Combustion device, 10. Cooling device, 11. Conveying device 5#, 12. Biochar loading device, 13. Conveying device 6#, 14. Conveying device 7#, 15. Purification and emission device, 16. Sorting device 2#, 17. Crushing device 2#, 18. Conveying device 8#, 19. Conveying device 9#, 20. Magnetic separation device, 21. Screening device, 22. Conveying device 10#, 23. Conveying device 11#, 24. Conveying device 12#, 25. Conveying device 13#, 26 Mixing and modification device. DETAILED DESCRIPTION

[0051] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0052] Example 1

[0053] like Figure 1 As shown, the coordinated treatment device for garden solid waste and construction solid waste used in the embodiment includes: 1. sorting device 1#, 2. conveying device 1#, 3. crushing device 1#, 4. conveying device 2#, 5. pressing and dehydrating device, 6. conveying device 3#, 7. conveying device 4#, 8. pyrolysis device, 9. combustion device, 10. cooling device, 11. conveying device 5#, 12. biochar loading device, 13. conveying device 6#, 14. conveying device 7#, 15. purification and emission device, 16. sorting device 2#, 17. crushing device 2#, 18. conveying device 8#, 19. conveying device 9#, 20. magnetic separation device, 21. screening device, 22. conveying device 10#, 23. conveying device 11#, 24. conveying device 12#, 25. conveying device 13#, 26. mixing and modification device.

[0054] The branch outlet of sorting device 1# is connected to the inlet of conveying device 1#; the outlet of conveying device 1# is connected to the crushing device; the outlet of crushing device is connected to conveying device 4#; the outlet of conveying device 4# is connected to the pyrolysis device; the outlet of pyrolysis device is connected to the cooling device; the outlet of cooling device is connected to the inlet of conveying device 5#; the outlet of conveying device 5# is connected to the inlet of biochar loading device; the outlet of biochar loading device is connected to the inlet of conveying device 13#; the outlet of conveying device 13# is connected to the inlet of mixing and modification device;

[0055] The leaf outlet of the sorting device 1# is connected to the inlet of the conveying device 2#; the outlet of the conveying device 2# is connected to the inlet of the pressing and dehydrating device; the outlet of the pressing and dehydrating device is connected to the inlet of the conveying device 6#; the outlet of the conveying device 6# is connected to the inlet of the biochar loading device;

[0056] The wood component outlet of the sorting device 2# is connected to the inlet of the conveying device 8#, and the outlet of the conveying device 8# is connected to the inlet of the crushing device 1#; the inorganic component outlet of the sorting device 2# is connected to the inlet of the crushing device 2#; the outlet of the crushing device 2# is connected to the inlet of the conveying device 9#; and the outlet of the conveying device 9# is connected to the inlet of the magnetic separation device;

[0057] The iron-containing component outlet of the magnetic separation device is connected to the inlet of the conveying device 10#; the outlet of the residual material after magnetic separation is connected to the inlet of the screening device; the outlet of the screening device for granular materials ≥1mm is connected to the inlet of the conveying device 11#; the outlet of the screening device for fine ash <1mm is connected to the inlet of the conveying device 12#; the outlet of the conveying device 12# is connected to the inlet of the mixing and modification device.

[0058] Preferably, the pyrolysis gas outlet of the pyrolysis device is connected to the fuel inlet of the combustion device, and the hot flue gas of the combustion device is used to heat the heat source of the pyrolysis device; the flue gas exhaust outlet of the pyrolysis device is connected to the inlet of the biochar loading device; the flue gas outlet of the biochar loading device is connected to the inlet of the conveying device 7#; the outlet of the conveying device 7# is connected to the purification emission device.

[0059] like Figure 1 and Figure 2 As shown, the garden solid waste is crushed and winnowed by the sorting device 1# to obtain branch particles and leaves, wherein the branch is transported to the crushing device 1# through the conveying device 1# for crushing treatment; the crushed material is transported to the pyrolysis device through the conveying device 4# for pyrolysis treatment; the pyrolysis temperature is 600℃~800℃, and the pyrolysis time is 30~60min; the pyrolysis gas of the pyrolysis device is burned in the combustion device, and the hot flue gas is used to heat the heat source of the pyrolysis device; the flue gas exhaust of the pyrolysis device is introduced into the biochar loading device, which is used for mixing, maturing and modifying the biochar and leaf squeeze liquid, and finally discharged after being treated by the purification emission device to meet the standards.

[0060] The red-hot biochar produced by the pyrolysis device is directly cooled in the cooling device. After cooling, the material is transported to the biochar loading device by the conveying device 5#. The leaves obtained by the sorting device 1# are transported to the pressing and dehydrating device by the conveying device 2# to obtain the pressed residue and pressed liquid. The pressed residue is transported to the crushing device 1# by the conveying device 3# and mixed with branches and other materials for fine crushing. The pressed liquid is transported to the biochar loading device by the conveying device 6# for biochar mixed modification treatment. The weight mixing ratio of biochar to pressed liquid is 1: (0.5~2).

[0061] The construction solid waste is sorted by the sorting device 2# to obtain wood components and inorganic components. The wood components are transported by the conveying device 8# to the crushing device 1# and mixed with branches and pressed residues for fine crushing for subsequent pyrolysis carbon treatment. The inorganic components obtained by sorting enter the crushing device 2# for crushing, and the crushed materials are transported by the conveying device 9#; first, the iron-containing materials are selected by the magnetic separation device and transported to the material yard by the conveying device 10#; the residual materials after magnetic separation are screened by the screening device, and the granular materials ≥1mm are transported to the material yard by the conveying device 11# and used as raw materials for building materials; the fine ash soil <1mm produced by the screening device is transported by the conveying device 12# to the mixing and modification device, and mixed and modified with the biochar loaded with the squeeze liquid, and the mixing ratio of fine ash soil and loaded modified biochar is (2~5):1; after mixing and modification, modified nutrient soil is obtained.

[0062] Example 2

[0063] A method for co-processing garden solid waste and construction solid waste, the method comprising:

[0064] S1. Garden solid waste is first sorted to obtain leaves and branches; the leaves are squeezed to obtain squeezed liquid and squeezed residue;

[0065] S2, sorting construction solid waste to obtain wood components and inorganic components;

[0066] S3, branches and wood components are mixed and crushed, and then mixed with the pressed residue obtained in S1 for pyrolysis and carbonization treatment, the pyrolysis temperature is 650°C; the pyrolysis time is 30 minutes; biochar is obtained; the biochar is mixed with the pressed liquid obtained in S1, the weight mixing ratio of biochar to pressed liquid is 1:1, and the waste heat of hot flue gas is used for heating to promote the decomposition of organic matter and the growth of microorganisms, and the loaded modified biochar is obtained;

[0067] S4. After the inorganic components of the construction solid waste are crushed, the iron-containing components obtained by magnetic separation are recycled; the residual materials after magnetic separation are sieved to obtain granular materials ≥1mm for use as raw materials for building materials; the fine ash soil <1mm is obtained and mixed with the loaded modified biochar to obtain modified nutrient soil, and the mixing ratio of fine ash soil to loaded modified biochar is 4:1.

[0068] Application effect: The obtained modified biochar is a modified product of pyrolytic carbon, ash soil and leaf squeezed organic liquid. Compared with simple pyrolytic carbon, it has a more complete pore structure and richer surface functional groups. It also carries nutrients and microbial flora, and the soil's carbon fixation and emission reduction capabilities are significantly improved.

[0069] The obtained modified biochar can be applied to the improvement of acidic and barren soils, which can improve soil quality, avoid soil inorganic carbon loss >15%, reduce carbon emissions by more than 10%, and increase crop yields by >10%. Applying it to mine greening soil is beneficial to the balanced growth of the roots of pioneer soil-fixing herbs and shrubs, and has excellent ecological value.

[0070] Example 3

[0071] A method for co-processing garden solid waste and construction solid waste, the method comprising:

[0072] S1. Garden solid waste is first sorted to obtain leaves and branches; the leaves are squeezed to obtain squeezed liquid and squeezed residue;

[0073] S2, sorting construction solid waste to obtain wood components and inorganic components;

[0074] S3, branches and wood components are mixed and crushed, and then mixed with the pressed residue obtained in S1 for pyrolysis and carbonization treatment, the pyrolysis temperature is 750°C; the pyrolysis time is 30 minutes; biochar is obtained; the biochar is mixed with the pressed liquid obtained in S1, the weight mixing ratio of biochar to pressed liquid is 1:2, and the waste heat of hot flue gas is used for heating to promote the decomposition of organic matter and the growth of microorganisms, and the loaded modified biochar is obtained;

[0075] S4. After the inorganic components of the construction solid waste are crushed, the iron-containing components obtained by magnetic separation are recycled; the residual materials after magnetic separation are sieved to obtain granular materials ≥1mm for use as raw materials for building materials; the fine ash soil <1mm is obtained and mixed with the loaded modified biochar to obtain modified nutrient soil, and the mixing ratio of fine ash soil to loaded modified biochar is 3:1.

[0076] Application effect: The obtained modified biochar is used for the remediation of heavy metal contaminated soil. Compared with conventional biochar remediation materials, due to the synergistic effect of pyrolysis carbon induced by functional microorganisms and the alkaline functional groups in the ash soil, it greatly promotes the transformation of metals such as copper, zinc, chromium, lead, cadmium, and manganese into a more stable residual state, and the heavy metal passivation / solidification efficiency is increased by more than 20%.

[0077] Comparative Example 1

[0078] On the basis of Example 2, the leaves and branches were not distinguished, that is, the garden solid waste was directly mixed with the building wood components and then pyrolyzed. It was found that: since the leaves and branches were not distinguished, the water content of the leaves was high, and the energy consumption increased during the pyrolysis process; on the other hand, if the leaves were not pressed, it would be impossible to obtain a liquid rich in organic matter and nutrients such as nitrogen and phosphorus, and it would be impossible to modify the biochar, improve its quality, and realize the resource utilization of the leaves according to their quality.

[0079] Comparative Example 2

[0080] On the basis of Example 2, the inorganic components in the construction solid waste are not subjected to magnetic separation, that is, they are directly classified according to particle size and then classified into construction materials or nutrient soil. It is found that this will cause steel wires, steel sheets, etc. in the construction ash soil to enter the construction materials, which on the one hand wastes high-value iron-containing raw materials and on the other hand affects its use as a construction material. At the same time, if it enters the soil without magnetic separation, it will not only waste high-value iron-containing raw materials, but also affect the soil quality and soil improvement effect.

[0081] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A method for collaboratively treating garden solid waste and construction solid waste using a collaborative treatment device for garden solid waste and construction solid waste, characterized in that: The device for implementing the coordinated treatment method of garden solid waste and construction solid waste includes: a sorting device 1#, a conveying device 1#, a crushing device 1#, a conveying device 2#, a pressing and dehydrating device, a conveying device 3#, a conveying device 4#, a pyrolysis device, a combustion device, a cooling device, a conveying device 5#, a biochar loading device, a conveying device 6#, a conveying device 7#, a purification and discharge device, a sorting device 2#, a crushing device 2#, a conveying device 8#, a conveying device 9#, a magnetic separation device, a screening device, a conveying device 10#, a conveying device 11#, a conveying device 12#, a conveying device 13#, and a mixing and modification device; The order of device connection is: The branch outlet of sorting device 1# is connected to the inlet of conveying device 1#; the outlet of conveying device 1# is connected to the crushing device; the outlet of crushing device is connected to conveying device 4#; the outlet of conveying device 4# is connected to the pyrolysis device; the outlet of pyrolysis device is connected to the cooling device; the outlet of cooling device is connected to the inlet of conveying device 5#; the outlet of conveying device 5# is connected to the inlet of biochar loading device; the outlet of biochar loading device is connected to the inlet of conveying device 13#; the outlet of conveying device 13# is connected to the inlet of mixing and modification device; The leaf outlet of the sorting device 1# is connected to the inlet of the conveying device 2#; the outlet of the conveying device 2# is connected to the inlet of the pressing and dehydrating device; the outlet of the pressing and dehydrating device is connected to the inlet of the conveying device 6#; the outlet of the conveying device 6# is connected to the inlet of the biochar loading device; The wood component outlet of the sorting device 2# is connected to the inlet of the conveying device 8#, and the outlet of the conveying device 8# is connected to the inlet of the crushing device 1#; the inorganic component outlet of the sorting device 2# is connected to the inlet of the crushing device 2#; the outlet of the crushing device 2# is connected to the inlet of the conveying device 9#; and the outlet of the conveying device 9# is connected to the inlet of the magnetic separation device; The iron component outlet of the magnetic separation device is connected to the inlet of the conveying device 10#; the residual material outlet after magnetic separation is connected to the inlet of the screening device; the particle material outlet of the screening device ≥1mm is connected to the inlet of the conveying device 11#; the fine dust outlet of the screening device <1mm is connected to the inlet of the conveying device 12#; the outlet of the conveying device 12# is connected to the inlet of the mixing and modification device; The pyrolysis gas outlet of the pyrolysis device is connected to the fuel inlet of the combustion device, and the hot flue gas of the combustion device is used to heat the heat source of the pyrolysis device; the flue gas outlet of the pyrolysis device is connected to the inlet of the biochar loading device; the flue gas outlet of the biochar loading device is connected to the inlet of the conveying device 7#; the outlet of the conveying device 7# is connected to the purification and emission device; Methods include: S1. The garden solid waste is first sorted to obtain leaves and branches; the leaves are squeezed to obtain squeezed liquid and squeezed residue; S2, sorting construction solid waste to obtain wood components and inorganic components; S3, mixing and crushing the branches obtained in S1 and the wood components obtained in S2, and mixing the crushed products with the pressed residues obtained in S1 for pyrolysis and carbonization treatment to obtain biochar; The biochar is mixed with the squeezed liquid obtained in S1, and heated by using the hot flue gas in the pyrolysis carbonization treatment to obtain loaded modified biochar; S4. The inorganic components obtained in S2 are crushed, and the iron-containing components obtained by magnetic separation are recycled; the iron-free components after magnetic separation are sieved to obtain granular materials with a size ≥1mm and fine ash soil with a size <1mm, wherein the fine ash soil is mixed with the loaded modified biochar described in S3 to obtain modified nutrient soil.

2. The method for collaboratively treating garden solid waste and construction solid waste using a collaborative treatment device for garden solid waste and construction solid waste according to claim 1, characterized in that: In step S3, the pyrolysis temperature is 600°C to 800°C; the pyrolysis time is 30 to 60 minutes; the combustible gas produced by the pyrolysis is used as fuel for the pyrolysis process to achieve energy self-sufficiency of the system.

3. The method for collaboratively processing garden solid waste and construction solid waste using a collaborative processing device for garden solid waste and construction solid waste according to claim 1 or 2, characterized in that: In step S3, the weight mixing ratio of biochar to squeezed liquid is 1:(0.5~2).

4. The method for collaboratively processing garden solid waste and construction solid waste using a collaborative processing device for garden solid waste and construction solid waste according to claim 1 or 2, characterized in that: In step S3, the flue gas exhaust in the pyrolysis carbonization treatment is used to heat the mixture of the biochar and the squeezed liquid to promote the decomposition of organic matter and the growth of microorganisms, and finally the flue gas exhaust is purified to achieve standard emission.

5. The method for collaboratively treating garden solid waste and construction solid waste using a collaborative treatment device for garden solid waste and construction solid waste according to claim 1, characterized in that: In step S4, the granular material is used as a raw material for building materials.

6. The method for collaboratively treating garden solid waste and construction solid waste using a collaborative treatment device for garden solid waste and construction solid waste according to claim 1 or 5, characterized in that: In step S4, the weight ratio of fine ash soil to loaded modified biochar is (2-5):

1.

7. The method for collaboratively treating garden solid waste and construction solid waste using a collaborative treatment device for garden solid waste and construction solid waste according to claim 1 or 5, characterized in that: In step S4, the modified nutrient soil is suitable for soil remediation, mine greening, and greening soil.

8. The method for collaboratively treating garden solid waste and construction solid waste using a collaborative treatment device for garden solid waste and construction solid waste according to claim 1, characterized in that: The separation device 1# is a conventional air separation device with a coarse crushing system; The conveying device 1#, conveying device 2#, conveying device 3#, conveying device 8#, conveying device 9#, conveying device 10#, and conveying device 11# are belt conveyors; The conveying device 4#, conveying device 5#, conveying device 12#, and conveying device 13# are screw conveyors, belt conveyors, or scraper conveyors; The crushing device 1# is a shearing crusher; The squeezing and dehydrating device is a screw extruder or a high-pressure dehydrator; The pyrolysis device is an indirect heating drum pyrolysis furnace; The combustion device is a coal gas or natural gas combustion furnace; The cooling device is an indirect cooling rotary drum, and the cooling medium is cold water or cold air; The biochar loading device is a mixing tank or a drum mixer with a stirring device; The conveying device 6# is a water pump; The conveying device 7# is a flue gas induced draft fan; The purification and emission device is a common flue gas and tail gas purification system; The sorting device 2# is a gravity sorting device or a manual sorting device; The crushing device 2# is a jaw crusher or a hammer crusher or a compound crusher; The magnetic separation device is a common ferromagnetic separation device; The screening device is a vibrating screen or a drum screen; The mixing and modifying device is a ribbon mixer or a drum mixer.

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