CN108273833B - In-situ layered utilization of building solid waste and application of building solid waste in reducing soil saline-alkali - Google Patents

In-situ layered utilization of building solid waste and application of building solid waste in reducing soil saline-alkali Download PDF

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CN108273833B
CN108273833B CN201810205918.8A CN201810205918A CN108273833B CN 108273833 B CN108273833 B CN 108273833B CN 201810205918 A CN201810205918 A CN 201810205918A CN 108273833 B CN108273833 B CN 108273833B
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soil
solid waste
layer
waste
fine
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CN108273833A (en
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张浪
朱永官
罗启仕
郑思俊
韩继刚
李晓策
伍海兵
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Shanghai Academy of Landscape Architecture Science and Planning
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE
    • B09B3/00Destroying solid waste or transforming solid waste into something useful or harmless
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • B09C1/10Reclamation of contaminated soil microbiologically, biologically or by using enzymes

Abstract

The invention provides a local layering utilization of building solid waste, which comprises the steps of crushing and screening the site building solid waste by using two types of coarse solid waste and fine solid waste; crushing plant residues, weeds, fallen leaves and branches by using two types of coarse greening plant wastes and fine greening plant wastes; adding soil, organic and inorganic improved materials and microbial agents into original soil of a field to form prepared soil for later use; and filling a coarse solid waste layer, a fine solid waste layer, a coarse green plant waste layer, a fine solid waste layer, a fine green plant waste layer and a prepared soil layer from the bottom layer to the surface layer by utilizing the field with the dug original soil, finally covering the field with a planting soil layer, and compacting during layered filling. By adopting the technical scheme of the invention, the cost for improving the physical structure of the soil in the engineering project field is reduced, and the environment-friendly effect of cyclic utilization is obvious; the solid waste layer cuts off the pores of the soil capillary to avoid the problem of salt and alkali return.

Description

In-situ layered utilization of building solid waste and application of building solid waste in reducing soil saline-alkali
Technical Field
The invention relates to an ecological utilization method of solid waste of a building, in particular to an ecological utilization method of solid waste for reducing the saline-alkali soil and achieving an economic effect.
Background
Solid waste such as building is one of the main sources of urban solid waste, and a large amount of solid waste such as building generally remains in engineering project sites and needs to be treated and cleared, and at present, there are three general ways for solid waste treatment at home and abroad: directly transported to remote landfill, used as a topographic construction material and recycled as a building material after being treated. Because of the influence of various types of solid wastes such as buildings, inconvenient transportation, engineering cost control and the like, the urban building wastes mainly adopt a different-place landfill mode at present, and a large amount of solid waste treatment cost and transportation cost need to be input, thereby bringing unnecessary waste. Meanwhile, landfill also causes waste of land resources and risks of secondary pollution for cities with shortage of land resources. Therefore, there is a need for an effective, rational and simple technical method for on-site disposal of solid waste such as construction of construction sites in engineering projects, which addresses the above problems, and which does not cause pollution to the site soil. Meanwhile, the utilization of solid wastes such as buildings on the spot inevitably causes the impoverishment of soil nutrients of the site, and is not beneficial to the subsequent ecological utilization of the site, such as the construction of park green lands, the construction of ecological galleries and the like.
Disclosure of Invention
The invention aims to solve the problems, provides a method for in-situ consumption of solid wastes such as buildings and the like and improvement of soil saline-alkali, and aims to comprehensively utilize the solid wastes such as buildings and the like with different particle sizes in a consumption site, apply green plant wastes, compost products of the green plant wastes and prepared soil to improve in-situ soil nutrient conditions and reduce the soil saline-alkali. The method has the characteristics of convenience, rapidness, less investment and no secondary pollution, has various effects of improving the physical structure and nutrient conditions of urban soil, reducing the saline-alkali content of the soil and the like, and has obvious economic benefit and ecological benefit.
A method for consuming solid wastes such as buildings and the like in a layering mode on site and reducing saline and alkaline content of soil specifically comprises the following steps:
(1) crushing and screening solid wastes of site buildings:
crushing and screening the site building solid waste according to two types of coarse solid waste and fine solid waste; sorting out materials (generally controlled to be 10-30 cm) which can decay for a long time and cause the deformation of the foundation (such as residual branches, foam and the like) due to volume variables;
the coarse solid waste: the solid waste formed after breaking and dismantling the buildings and the terraces is subjected to sorting and crushing treatment, and the particle size of the solid waste is 16cm-30 cm;
the fine solid waste: the solid waste formed after breaking and dismantling the buildings and the terraces is subjected to sorting and crushing treatment, and the particle size of the solid waste is less than 16 cm.
(2) Preparing green plant wastes:
crushing plant residues, weeds, fallen leaves and branches according to two types of coarse greening plant wastes and fine greening plant wastes;
the coarse green plant waste refers to tree and shrub trimmings, thinning matters, lawn trimmings, weeds, fallen leaves, branches, garden and waste grass and flowers in a flower bed, which are generated in the natural or maintenance process of green plants in urban green lands or suburb forest lands, and the particle size is 20-40 mm;
the fine greening plant waste refers to waste of trees and shrubs, cuttings, lawn cuttings, weeds, fallen leaves, branches, gardens and waste flowers in flower beds generated in the natural or maintenance process of greening plants in urban green lands or suburb forest lands, and the particle size of the waste is less than 13 mm.
(3) Preparing the prepared soil:
digging original soil, and adding foreign soil, organic and inorganic improved materials and microbial agents into the original soil of the field to form prepared soil for later use; the prepared soil is prepared by human intervention and meets the nutritional requirements of healthy and rapid growth of plants. The method is mainly characterized in that original soil, foreign soil, organic and inorganic improved materials and microbial agents are scientifically prepared according to the site conditions, and the method has good physical properties and high biological activity and environmental regulation and control capability.
The physical and chemical properties of the raw soil in the compound soil are that the pH is more than 8, the EC is less than 0.3mS/cm, the organic matter is less than 12g/kg, and the texture is sticky and heavy. The physical and chemical properties of the alien soil are that the pH is more than 9, the EC is less than 0.15mS/cm, the organic matter is less than 10g/kg, and the texture is sticky and heavy.
The addition mass ratio of the original soil, the foreign soil, the organic and inorganic improved material and the microbial agent in the prepared soil is 100: 20-40: 1-10: 0.1-2.
The addition mass ratio of the original soil, the foreign soil, the organic and inorganic improved material and the microbial agent in the prepared soil is 100: 28: 6: 1.
the organic and inorganic improved material is prepared from dry branches and fallen leaves waste, mushroom slag, vinegar slag, organic fertilizer, humic acid, polyacrylamide, desulfurized gypsum and sulfur according to a mass ratio of 40-50: 10-15: 16-25: 10-15: 1-5: 1-8: 3-7: 5-10.
Further preferably, the organic and inorganic modified material also comprises ammonium polyphosphate, and the addition amount of the ammonium polyphosphate accounts for 10-15% of the organic and inorganic modified material; the polyacrylamide can be replaced by acrylic acid or acrylamide modified chitosan; the desulfurization gypsum can be replaced by phosphogypsum.
The organic and inorganic improved material can be preferably ammonium polyphosphate, phosphogypsum, humic acid, acrylic acid or acrylamide modified chitosan, and the mass ratio of the organic and inorganic improved material is 1-3:20-40:5-10:5-10, and the mass ratio of the organic and inorganic improved material is 2: 33:8:8.
The microbial agent is a microbial agent for improving soil, and specifically comprises a phosphate-solubilizing microbial agent (Bacillus megaterium) Silicate microorganism bacterium agent: (Bacillus mucilaginosus) Organic material decomposing agent (A)Bacillus subtilis、Paenibacillus polymyxa、Bacillus pumilus) Or a soil remediation agent (a)Bacillus licheniformis、Pseudomonas putida) One or more of (a).
(4) The layered digestion construction method comprises the following steps:
the method comprises the steps of utilizing a field after the original soil is dug, determining the depth of a digestion site and the layering thickness according to the types and the total amount of solid wastes such as buildings and green plant wastes, filling a coarse solid waste layer, a fine solid waste layer, a coarse green plant waste layer, a fine solid waste layer, a fine green plant waste layer and a prepared soil layer from the bottom layer to the surface layer, finally covering a planting soil layer (soil meeting the requirements of garden greening planting on the original field), and compacting during layering filling, so that the in-situ layering utilization of the solid wastes of the buildings can be completed.
In the step (4), the thicknesses of the coarse solid waste layer, the fine solid waste layer, the coarse green plant waste layer, the fine solid waste layer, the fine green plant waste layer and the ecological soil layer are respectively filled from the bottom layer to the surface layer, and are 25-50cm, 10-20cm and 50cm in sequence.
More preferably, in the step (4), the thicknesses of the coarse solid waste layer, the fine solid waste layer, the coarse green plant waste layer, the fine solid waste layer, the fine green plant waste layer and the compost layer are 40cm, 30cm, 15cm and 50cm in this order from the bottom layer to the surface layer.
The technical scheme of the invention is the application of the in-situ layered utilization of the building solid waste in the reduction of the saline and alkaline of the soil. The saline-alkali soil is soil containing soluble salts and having the salt content of 0.1-0.2%, and the salt content of the saline-alkali soil can be reduced by 15-20% within one year by adopting the technical scheme of the invention.
The invention has the advantages that:
according to the technical scheme, the multi-layer structure with different pore conditions is constructed by layering the solid wastes such as buildings with different particle sizes, so that the solid wastes can be reasonably utilized on site without damaging the basic structure of the soil, and meanwhile, the greening wastes with different treatment degrees, compost products of the greening wastes and the compost and the formulated soil are combined to improve the nutrients of the soil, so that the problem of soil impoverishment can be avoided. The multilayer structure can greatly improve the infiltration rate of the field soil and has the additional effect of accelerating the leaching of the saline and alkaline of the urban soil and reducing the salt alkalinity.
In the formula of the compound soil, the organic and inorganic improved material is compounded by ammonium polyphosphate, phosphogypsum, humic acid, acrylic acid or acrylamide modified chitosan high polymer material and other raw materials, so that the physicochemical properties of the original soil are improved. The ammonium polyphosphate can slowly release nitrogen and phosphorus fertilizer efficiency factors and improve the nutrient structure of soil. The phosphogypsum provides a certain amount of phosphorus nutrients on one hand, and regulates the pH value of the soil and enhances the buffering capacity of the soil on the other hand. The humic acid can be separated from and combined with metal ions in water, is beneficial to transmitting nutrient elements to crops, can improve the soil structure and is beneficial to the growth of the crops. The soil conditioner of the chitosan polymer material modified by the acrylic acid or the acrylamide obviously increases the water-stable aggregate content of the soil, increases the water erosion resistance of the soil and correspondingly reduces water and soil loss.
After the dead branches and fallen leaves waste, the mushroom slag and the vinegar slag are mixed with other raw materials, under the action of weak acidity, the porous rate is increased, the decomposition of the solid waste of the green plants is facilitated, and the effects of digestion and discharge are achieved.
The method is simple, convenient and quick, has lower cost and easy popularization, and has various advantages, such as directly utilizing solid wastes of buildings and the like on site, and reducing resource waste and secondary pollution; the physical structure of the soil of the engineering project site is improved at low cost, and the environmental protection effect of cyclic utilization is obvious; the problem of salt and alkali return is avoided by cutting off the pores of the soil capillary through solid waste layers such as buildings and the like; the prepared soil improves the soil nutrient condition, and is beneficial to ecological utilization of the field in the later period; the method has extremely high guiding application value for the treatment and utilization of solid wastes in the engineering project field and the improvement of field soil, and has considerable economic benefit.
Drawings
Fig. 1 is a structural diagram of the construction of the in-situ layered consumption of the solid wastes of the building, wherein 1 is a coarse solid waste layer, 2 is a fine solid waste layer, 3 is a coarse green plant waste layer, 4 is a mixed layer of the fine green plant wastes and the auxiliary soil, and 5 is a planting soil layer.
Detailed description of the invention
Example 1
(1) Crushing and screening solid wastes of site buildings:
crushing and screening the site building solid waste according to two types of coarse solid waste and fine solid waste; sorting out materials which can decay for a long time and cause the deformation of the foundation (such as residual branches, foam and the like) caused by volume variables;
the coarse solid waste: the solid waste formed after breaking and dismantling the buildings and the terraces is subjected to sorting and crushing treatment, and the particle size of the solid waste is 20-30 cm;
the fine solid waste: the solid waste formed after breaking and dismantling the buildings and the terraces is subjected to sorting and crushing treatment, and the particle size of the solid waste is 10-16 cm.
(2) Preparing green plant wastes:
crushing plant residues, weeds, fallen leaves and branches according to two types of coarse greening plant wastes and fine greening plant wastes;
the coarse green plant waste refers to arbors and shrubs, cuttings, lawn cuttings, weeds, fallen leaves, branches, garden and waste grass and flowers in flower beds generated in the natural or maintenance process of green plants in urban green lands or suburb forest lands, and the particle size is 35-40 mm;
the fine greening plant waste refers to tree and shrub trimmings, intermediate cuts, lawn trimmings, weeds, fallen leaves, branches, garden and waste grass and flowers in a flower bed, which are generated in the natural or maintenance process of greening plants in urban green lands or suburb forest lands, and the particle size is 5-8 mm.
(3) Preparing the prepared soil:
digging original soil, and adding foreign soil, organic and inorganic improved materials and microbial agents into the original soil of the field to form prepared soil for later use; the prepared soil is prepared by human intervention and meets the nutritional requirements of healthy and rapid growth of plants. The method is mainly characterized in that original soil, foreign soil, organic and inorganic improved materials and microbial agents are scientifically prepared according to the site conditions, and the method has good physical properties and high biological activity and environmental regulation and control capability.
The addition mass ratio of the original soil, the foreign soil, the organic and inorganic improved material and the microbial agent in the prepared soil is 100: 28: 6: 1. the physical and chemical properties of the raw soil in the compound soil are that the pH is more than 8, the EC is less than 0.3mS/cm, the organic matter is less than 12g/kg, and the texture is sticky and heavy. The physical and chemical properties of the alien soil are that the pH is more than 9, the EC is less than 0.15mS/cm, the organic matter is less than 10g/kg, and the texture is sticky and heavy.
The organic and inorganic improved material is prepared from ammonium polyphosphate, phosphogypsum, humic acid and acrylamide modified chitosan high polymer material according to the mass ratio of 2: 33:8: 8.
The microbial agent isBacillus megaterium
(4) The layered digestion construction method comprises the following steps:
the method comprises the steps of utilizing a field after the original soil is dug, determining the depth of a digestion site and the layering thickness according to the types and the total amount of solid wastes such as buildings and green plant wastes, filling a coarse solid waste layer, a fine solid waste layer, a coarse green plant waste layer, a fine solid waste layer, a fine green plant waste layer and a prepared soil layer from the bottom layer to the surface layer, finally covering a planting soil layer (soil meeting the requirements of garden greening planting on the original field), and compacting during layering filling, so that the in-situ layering utilization of the solid wastes of the buildings can be completed.
The thicknesses of a coarse solid waste layer, a fine solid waste layer, a coarse green plant waste layer, a fine solid waste layer, a fine green plant waste and a mixed layer of the auxiliary soil (the mixture ratio of the two is 1: 1) which are respectively filled from the bottom layer to the surface layer are 40cm, 30cm, 15cm and 50cm in sequence.
By adopting the technical scheme of the invention, the saline-alkali soil containing soluble salts and having the salt content of 0.15 percent can be reduced to 0.141 percent within 6 months (3 months to 9 months).
Example 2
(1) Crushing and screening solid wastes of site buildings:
crushing and screening the site building solid waste according to two types of coarse solid waste and fine solid waste; sorting out materials which can decay for a long time and cause the deformation of the foundation (such as residual branches, foam and the like) caused by volume variables;
the coarse solid waste: the solid waste formed after breaking and dismantling the buildings and the terraces is subjected to sorting and crushing treatment, and the particle size of the solid waste is 16cm-20 cm;
the fine solid waste: the solid waste formed after breaking and dismantling the buildings and the terraces is subjected to sorting and crushing treatment, and the particle size of the solid waste is 10cm-16 cm.
(2) Preparing green plant wastes:
crushing plant residues, weeds, fallen leaves and branches according to two types of coarse greening plant wastes and fine greening plant wastes;
the coarse green plant waste refers to arbors and shrubs, cuttings, lawn cuttings, weeds, fallen leaves, branches, garden and waste grass and flowers in flower beds, which are generated in the natural or maintenance process of green plants in urban green lands or suburb forest lands, and the particle size is 25-35 mm;
the fine greening plant waste refers to waste of trees and shrubs, cuttings, lawn cuttings, weeds, fallen leaves, branches, gardens and waste flowers in flower beds generated in the natural or maintenance process of greening plants in urban green lands or suburb forest lands, and the particle size of the waste is 10-13 mm.
(3) Preparing the prepared soil:
digging original soil, and adding foreign soil, organic and inorganic improved materials and microbial agents into the original soil of the field to form prepared soil for later use; the prepared soil is prepared by human intervention and meets the nutritional requirements of healthy and rapid growth of plants. The method is mainly characterized in that original soil, foreign soil, organic and inorganic improved materials and microbial agents are scientifically prepared according to the site conditions, and the method has good physical properties and high biological activity and environmental regulation and control capability.
The addition mass ratio of the original soil, the foreign soil, the organic and inorganic improved material and the microbial agent in the prepared soil is 100: 28: 7.2: 1.5. the physical and chemical properties of the raw soil in the compound soil are that the pH is more than 8, the EC is less than 0.3mS/cm, the organic matter is less than 12g/kg, and the texture is sticky and heavy. The physical and chemical properties of the alien soil are that the pH is more than 9, the EC is less than 0.15mS/cm, the organic matter is less than 10g/kg, and the texture is sticky and heavy.
The organic and inorganic improved material is prepared from ammonium polyphosphate, phosphogypsum, humic acid and acrylic acid modified chitosan high polymer materials according to the mass ratio of 1.5: 28: 6.5: 6.
The microbial agent isPaenibacillus polymyxa。
(4) The layered digestion construction method comprises the following steps:
the method comprises the steps of utilizing a field after the original soil is dug, determining the depth of a digestion site and the layering thickness according to the types and the total amount of solid wastes such as buildings and green plant wastes, filling a coarse solid waste layer, a fine solid waste layer, a coarse green plant waste layer, a fine solid waste layer, a fine green plant waste layer and a prepared soil layer from the bottom layer to the surface layer, finally covering a planting soil layer (soil meeting the requirements of garden greening planting on the original field), and compacting during layering filling, so that the in-situ layering utilization of the solid wastes of the buildings can be completed.
The thicknesses of a coarse solid waste layer, a fine solid waste layer, a coarse green plant waste layer, a fine solid waste layer, a fine green plant waste and a mixed layer of the auxiliary soil (the mixture ratio of the two is 1: 1) which are respectively filled from the bottom layer to the surface layer are 30cm, 25cm, 20cm and 50cm in sequence.
The technical scheme of the invention is the application of the in-situ layered utilization of the building solid waste in the reduction of the saline and alkaline of the soil.
By adopting the technical scheme of the invention, the saline-alkali soil containing soluble salts and having the salt content of 0.15 percent can be reduced to 0.133 percent within 10 months (3 months-1 month of the next year).
Example 3
(1) Crushing and screening solid wastes of site buildings:
crushing and screening the site building solid waste according to two types of coarse solid waste and fine solid waste; sorting out materials which can decay for a long time and cause the deformation of the foundation (such as residual branches, foam and the like) caused by volume variables;
the coarse solid waste: the solid waste formed after breaking and dismantling the buildings and the terraces is subjected to sorting and crushing treatment, and the particle size of the solid waste is 25-30 cm;
the fine solid waste: the solid waste formed after breaking and dismantling the buildings and the terraces is subjected to sorting and crushing treatment, and the particle size of the solid waste is 8-12 cm.
(2) Preparing green plant wastes:
crushing plant residues, weeds, fallen leaves and branches according to two types of coarse greening plant wastes and fine greening plant wastes;
the coarse green plant waste refers to arbors and shrubs, cuttings, lawn cuttings, weeds, fallen leaves, branches, garden and waste grass and flowers in flower beds generated in the natural or maintenance process of green plants in urban green lands or suburb forest lands, and the particle size is 35-40 mm;
the fine greening plant waste refers to tree and shrub trimmings, intermediate cuts, lawn trimmings, weeds, fallen leaves, branches, garden and waste grass and flowers in a flower bed, which are generated in the natural or maintenance process of greening plants in urban green lands or suburb forest lands, and the particle size is 5-8 mm.
(3) Preparing the prepared soil:
digging original soil, and adding foreign soil, organic and inorganic improved materials and microbial agents into the original soil of the field to form prepared soil for later use; the prepared soil is prepared by human intervention and meets the nutritional requirements of healthy and rapid growth of plants. The method is mainly characterized in that original soil, foreign soil, organic and inorganic improved materials and microbial agents are scientifically prepared according to the site conditions, and the method has good physical properties and high biological activity and environmental regulation and control capability.
The addition mass ratio of the original soil, the foreign soil, the organic and inorganic improved material and the microbial agent in the prepared soil is 100: 21: 7: 1.1. the physical and chemical properties of the raw soil in the compound soil are that the pH is more than 8, the EC is less than 0.3mS/cm, the organic matter is less than 12g/kg, and the texture is sticky and heavy. The physical and chemical properties of the alien soil are that the pH is more than 9, the EC is less than 0.15mS/cm, the organic matter is less than 10g/kg, and the texture is sticky and heavy.
The organic and inorganic improved material is prepared from dry branches and fallen leaves waste, mushroom slag, vinegar slag, organic fertilizer, humic acid, polyacrylamide, desulfurized gypsum and sulfur according to a mass ratio of 43: 12: 20: 14: 3.5: 2.7: 3.5: 6.8.
The microbial agent isBacillus megaterium
(4) The layered digestion construction method comprises the following steps:
the method comprises the steps of utilizing a field after the original soil is dug, determining the depth of a digestion site and the layering thickness according to the types and the total amount of solid wastes such as buildings and green plant wastes, filling a coarse solid waste layer, a fine solid waste layer, a coarse green plant waste layer, a fine solid waste layer, a fine green plant waste layer and a prepared soil layer from the bottom layer to the surface layer, finally covering a planting soil layer (soil meeting the requirements of garden greening planting on the original field), and compacting during layering filling, so that the in-situ layering utilization of the solid wastes of the buildings can be completed.
The thicknesses of a coarse solid waste layer, a fine solid waste layer, a coarse green plant waste layer, a fine solid waste layer, a fine green plant waste and a mixed layer of the auxiliary soil (the mixture ratio of the two is 1: 1) which are respectively filled from the bottom layer to the surface layer are 44cm, 38cm, 19cm, 12cm and 50cm in sequence.
By adopting the technical scheme of the invention, the saline-alkali soil containing soluble salts and having the salt content of 0.15 percent can be reduced to 0.12 percent within 12 months (3 months-3 months of the next year).
Example 4
(1) Crushing and screening solid wastes of site buildings:
crushing and screening the site building solid waste according to two types of coarse solid waste and fine solid waste; sorting out materials which can decay for a long time and cause the deformation of the foundation (such as residual branches, foam and the like) caused by volume variables;
the coarse solid waste: the solid waste formed after breaking and dismantling the buildings and the terraces is subjected to sorting and crushing treatment, and the particle size of the solid waste is 16cm-20 cm;
the fine solid waste: the solid waste formed after breaking and dismantling the buildings and the terraces is subjected to sorting and crushing treatment, and the particle size of the solid waste is 10cm-16 cm.
(2) Preparing green plant wastes:
crushing plant residues, weeds, fallen leaves and branches according to two types of coarse greening plant wastes and fine greening plant wastes;
the coarse green plant waste refers to arbors and shrubs, cuttings, lawn cuttings, weeds, fallen leaves, branches, garden and waste grass and flowers in flower beds, which are generated in the natural or maintenance process of green plants in urban green lands or suburb forest lands, and the particle size is 25-35 mm;
the fine greening plant waste refers to waste of trees and shrubs, cuttings, lawn cuttings, weeds, fallen leaves, branches, gardens and waste flowers in flower beds generated in the natural or maintenance process of greening plants in urban green lands or suburb forest lands, and the particle size of the waste is 10-13 mm.
(3) Preparing the prepared soil:
digging original soil, and adding foreign soil, organic and inorganic improved materials and microbial agents into the original soil of the field to form prepared soil for later use; the prepared soil is prepared by human intervention and meets the nutritional requirements of healthy and rapid growth of plants. The method is mainly characterized in that original soil, foreign soil, organic and inorganic improved materials and microbial agents are scientifically prepared according to the site conditions, and the method has good physical properties and high biological activity and environmental regulation and control capability.
The addition mass ratio of the original soil, the foreign soil, the organic and inorganic improved material and the microbial agent in the prepared soil is 100: 30: 5: 1.5. the physical and chemical properties of the raw soil in the compound soil are that the pH is more than 8, the EC is less than 0.3mS/cm, the organic matter is less than 12g/kg, and the texture is sticky and heavy. The physical and chemical properties of the alien soil are that the pH is more than 9, the EC is less than 0.15mS/cm, the organic matter is less than 10g/kg, and the texture is sticky and heavy.
The organic and inorganic improved material is replaced by dead branches and fallen leaves waste, mushroom residue, vinegar residue, organic fertilizer, humic acid and chitosan modified by acrylic acid, and phosphogypsum, sulfur and ammonium polyphosphate in a mass ratio of 42: 13: 22: 13: 3.5: 2.5: 5.5: 8.5: 15.4.
The microbial agent isBacillus subtilis。
(4) The layered digestion construction method comprises the following steps:
the method comprises the steps of utilizing a field after the original soil is dug, determining the depth of a digestion site and the layering thickness according to the types and the total amount of solid wastes such as buildings and green plant wastes, filling a coarse solid waste layer, a fine solid waste layer, a coarse green plant waste layer, a fine solid waste layer, a fine green plant waste layer and a prepared soil layer from the bottom layer to the surface layer, finally covering a planting soil layer (soil meeting the requirements of garden greening planting on the original field), and compacting during layering filling, so that the in-situ layering utilization of the solid wastes of the buildings can be completed.
The thicknesses of a coarse solid waste layer, a fine solid waste layer, a coarse green plant waste layer, a fine solid waste layer, a fine green plant waste and a mixed layer of the auxiliary soil (the mixture ratio of the two is 1: 1) which are respectively filled from the bottom layer to the surface layer are respectively 38cm, 25cm, 16cm, 14cm and 50 cm.
The technical scheme of the invention is the application of the in-situ layered utilization of the building solid waste in the reduction of the saline and alkaline of the soil.
By adopting the technical scheme of the invention, the saline-alkali soil containing soluble salts and having the salt content of 0.15 percent can be reduced to 0.12 percent within 12 months (3 months-3 months of the next year).

Claims (5)

1. The application of in-situ layered utilization of solid waste in building in reducing saline and alkali in soil, the saline and alkali soil being soil containing soluble salt and with salt content of 0.1-0.2%, and the characteristic is that,
(1) crushing and screening solid wastes of site buildings:
crushing and screening the site building solid waste according to two types of coarse solid waste and fine solid waste;
(2) preparing green plant wastes:
crushing and screening green plant wastes including weeds, fallen leaves and branches according to two types of coarse green plant wastes and fine green plant wastes;
(3) preparing the prepared soil:
digging original soil, and adding soil dressing, organic and inorganic improved materials and a microbial agent into the original soil of a field to form prepared soil for later use, wherein the adding mass ratio of the original soil, the soil dressing, the organic and inorganic improved materials and the microbial agent in the prepared soil is 100: 20-40: 1-10: 0.1-2, wherein the microbial agent is a microbial agent for improving soil;
the organic and inorganic improved material is prepared from ammonium polyphosphate, phosphogypsum, humic acid and acrylamide modified chitosan high polymer material according to the mass ratio of 2: 33:8:8, preparing a mixture;
(4) the layered digestion construction method comprises the following steps:
the method comprises the steps of filling a coarse solid waste layer, a fine solid waste layer, a coarse green plant waste layer, a fine solid waste layer, a fine green plant waste layer and a prepared soil layer from a bottom layer to a surface layer of a field dug from original soil, finally covering the field on a planting soil layer, compacting during layered filling, filling the coarse solid waste layer, the fine solid waste layer, the coarse green plant waste layer, the fine solid waste layer, the fine green plant waste layer and the prepared soil layer from the bottom layer to the surface layer in sequence, wherein the thicknesses of the coarse solid waste layer, the fine solid waste layer, the coarse green plant waste layer, the fine solid waste layer, the fine green plant waste layer and the prepared soil layer are 25-50cm, 10-20cm and 50cm, so that the in-situ layered utilization of the solid waste of the building can be completed.
2. Use of the in situ stratified utility of building solid waste as claimed in claim 1 for reducing soil salinity and alkalinity, wherein the coarse solid waste is: the solid waste formed after breaking and dismantling the buildings and the terraces is subjected to sorting and crushing treatment, and the particle size of the solid waste is 16cm-30 cm;
the fine solid waste: the solid waste formed after breaking and dismantling the buildings and the terraces is subjected to sorting and crushing treatment, and the particle size of the solid waste is less than 16 cm.
3. The use of in situ stratification of waste solids from buildings according to claim 1 for reducing the salinity of soils,
the coarse green plant waste refers to the waste of arbors and shrubs, lawn trimmings, weeds, fallen leaves, branches, gardens and waste grass and flowers in flower beds generated in the natural or maintenance process of green plants in urban green lands or suburb forest lands, and the particle size is 20-40 mm;
the fine greening plant waste refers to waste of arbors and shrubs, lawn trimmings, weeds, fallen leaves, branches, gardens and waste grass and flowers in flower beds, which are generated in the natural or maintenance process of greening plants in urban green lands or suburb forest lands, and the particle size of the waste is less than 13 mm.
4. The application of the in-situ layered utilization of the building solid waste in the reduction of the saline and alkaline content of the soil as claimed in claim 1, wherein the addition mass ratio of the original soil, the foreign soil, the organic and inorganic improving materials and the microbial agent in the prepared soil is 100: 28: 6: 1.
5. the use of the in-situ layered utilization of the building solid waste in the reduction of the saline and alkaline content of the soil according to claim 1, wherein in the step (4), the thicknesses of the coarse solid waste layer, the fine solid waste layer, the coarse green plant waste layer, the fine solid waste layer, the fine green plant waste layer and the regolith layer are 40cm, 30cm, 15cm and 50cm in sequence from the bottom layer to the surface layer.
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