Composite modifier applicable to regeneration of green plant soil from engineering abandoned soil and preparation method of composite modifier

Abstract

The invention discloses a composite modifier applicable to regeneration of green plant soil from engineering abandoned soil and a preparation method thereof. The composite modifier comprises the following components in percentage by weight: 81.5-97.5% of a sterilizing and disinfecting component, 0.06-0.14% of an oxygen increasing component, 0.6-1.7% of a fertility increasing component and 1.7-2.7% of a pH adjusting component, the sterilization and disinfection component is formed by compounding citric acid, sodium benzoate, potassium oxide and chlorine dioxide powder, and the weight percentages of the citric acid, the sodium benzoate, the potassium oxide and the chlorine dioxide powder are respectively 30-44%, 5-8%, 0.5-0.9% and 46-61% of the sterilization and disinfection component. According to the composite modifier applicable to regeneration of the green plant soil from the engineering abandoned soil and the preparation method, improvement is carried out on the basis of a common soil modifier formula, so that the soil modifier prepared from various inorganic salts and organic raw materials is provided, and the soil modifier is used in the plant growth process, so that the growth rate of plants is increased, and the quality of the plants is improved. The novel composite modifier is mixed into the engineering abandoned soil, so that the effects of improving the soil structure and physicochemical properties, improving the disease resistance of crops, sterilizing, strengthening seedlings, increasing the yield and improving the quality are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of composite soil improvers for greening, and in particular relates to a composite improver suitable for regenerating greening soil from engineering abandoned soil and a preparation method thereof. Background Art

[0002] With the rapid development of urban construction in China, the discharge of engineering waste soil has increased year by year. However, China's current utilization rate of engineering waste soil is low, and there is still a lot of waste. Compared with developed countries, China has a huge room for improvement in its ability to handle engineering waste soil. Engineering waste soil has the following characteristics: it contains harmful impurities, etc., which is a problem of how to reasonably recycle and utilize it; it has complex and diverse components and high water content. The composition and properties of different soil bodies are very different, and it cannot be used directly without distinction; it lacks fertility, the soil is compact and has low oxygen content. At present, most of the construction waste is engineering waste soil, which has the characteristics of large quantity, complex composition, and difficult treatment. It has become a problem that needs to be solved in the sustainable development of cities today. Therefore, in order to make full use of and improve engineering waste soil, it is an extremely important scientific task to research, develop, and apply soil improvement products, control soil degradation and heavy metal pollution, and ensure plant growth.

[0003] Commonly used soil conditioners on the market include biochar, compost humus, surfactants, etc. These soil conditioners have the disadvantages of single element content, incomplete effective ingredients, low content, etc., which are insufficient to meet the requirements for plant growth and easily cause soil compaction, which is not conducive to root development and growth. The present invention relates to a soil conditioner prepared by mixing multiple inorganic salts and organic raw materials. Summary of the invention

[0004] The purpose of the present invention is to provide a composite improver and a preparation method suitable for regenerating green plant soil from engineering waste soil. By improving the commonly used soil improver formula, a soil improver prepared from a variety of inorganic salts and organic raw materials is provided. During the plant growth process, the new composite improver is mixed into the engineering waste soil to achieve the effects of improving soil structure and physical and chemical properties, improving crop disease resistance, sterilization, seedling strengthening, increasing yield, and improving quality.

[0005] To achieve the above-mentioned purpose, the present invention provides a composite improver suitable for regenerating green soil from engineering abandoned soil, which comprises the following components by weight percentage: 81.5-97.5% of a sterilization component, 0.06-0.14% of an oxygenation component, 0.6-1.7% of a fertilization component, and 1.7-2.7% of a pH adjustment component; The sterilization and disinfection component is formed by a composite of citric acid, sodium benzoate, potassium oxide and chlorine dioxide powder, and the weight percentages of citric acid, sodium benzoate, potassium oxide and chlorine dioxide powder account for 30-44%, 5-8%, 0.5-0.9% and 46-61% of the sterilization and disinfection component respectively.

[0006] Preferably, the oxygen-enhancing component is calcium peroxide particles with a particle size of 3-5 mm; the fattening component is composed of superphosphate and urea with a particle size of 3-5 mm, which account for 45-92% and 8-55% of the fattening component by weight respectively; and the pH modulation component is aluminum sulfate.

[0007] A method for preparing a composite improver suitable for regenerating green soil from engineering abandoned soil, comprising the following steps: S1. The sterilization and disinfection component, the oxygenation component, the fertilization component and the pH modulation component are converted into actual weight percentages for mixing to prepare powders or granules; S2, mixing the raw materials of each component to prepare a bulk mixture, and sealing the prepared bulk mixture, and storing it in an environment with low temperature and dry conditions to obtain a composite improver suitable for regenerating green soil from engineering abandoned soil; S3, mix the prepared composite improver for regenerating green soil with engineering waste soil in a ratio of 1:11-1:15, and let it stand for 6-8 days; S4. Use the abandoned engineering soil with the addition of a composite improver suitable for regenerating green plant soil from abandoned engineering soil as the organic matrix, and take Manila lawn as the reference vegetation to observe its germination rate and seedling height.

[0008] Preferably, in step S3, before the prepared bulk mixture is mixed into the engineering waste soil, the soil is firstly fully broken up and then mixed and stirred with the prepared bulk mixture.

[0009] Preferably, in step S4, after the engineering waste soil to which the composite improver suitable for regenerating green plant soil from engineering waste soil is added is used as the organic matrix, the moisture content of the mixed material is controlled to be 45-55wt%.

[0010] The present invention adopts the above-mentioned composite improver and preparation method suitable for regenerating green soil from engineering abandoned soil, and the beneficial effects are as follows: 1. The composite improver for regenerating green plant soil from abandoned engineering soil prepared by the present invention can achieve the effects of sterilization, topdressing and oxygenation through material hydrolysis or its own chemical properties, and has a certain effect on improving the abandoned engineering soil that lacks fertility, has tight soil quality and low oxygen content, and has alkalinity, which is not conducive to plant growth; it can reduce soil alkalinity, improve water and fertilizer retention capacity, and improve soil conditions from all aspects, with obvious effects; it is easy to produce and environmentally friendly; 2. The composite improver of engineering abandoned soil regeneration green plant soil prepared by the present invention is a mixed product of organic matter and inorganic salt. After being applied to the soil, it is decomposed and transformed by microorganisms to re-synthesize complex organic colloids. It contains soluble egg protein and humic acid, has moderate cohesiveness, can make clay loose, and sandy soil bonded to form a stable aggregate structure, and contains a variety of nutrients, which is beneficial to the activity of microorganisms and the growth of plants. It has the fertilizer effect of organic and inorganic fertilizers, realizes the stability of fertilizer and water conservation structure, and the application effect of smooth spraying is a good soil improver; 3. The composite improver for regenerating greening soil from engineering waste soil prepared by the present invention can improve the physical and chemical properties of engineering waste soil, which is beneficial to promoting the reuse of engineering waste soil, being green, environmentally friendly, and energy-saving; and conforms to the development trend of waste resource utilization, large-scale and factory-based treatment and the requirements of spraying greening.

[0011] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention is a flow chart of an embodiment of a composite improver and a preparation method suitable for regenerating green plant soil from engineering waste soil. DETAILED DESCRIPTION

[0013] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0014] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0015] like Figure 1 As shown, a method for preparing a composite improver suitable for regenerating green soil from engineering abandoned soil comprises the following steps: S1. The sterilization and disinfection component, the oxygenation component, the fertilization component and the pH modulation component are converted into actual weight percentages for mixing to prepare powders or granules.

[0016] The weight percentage of each component is specifically as follows: 81.5-97.5% of the sterilization component, 0.06-0.14% of the oxygenation component, 0.6-1.7% of the fertilizer component, and 1.7-2.7% of the pH adjustment component.

[0017] The raw materials used for soil sterilization and disinfection are as follows: the soil sterilization and disinfection component is formed by a compound of citric acid, sodium benzoate, potassium oxide and chlorine dioxide powder. Among them, citric acid has a good effect of killing bacterial spores. Sodium benzoate has a good effect on yeast, mold and some bacteria. Citric acid and sodium benzoate achieve the sterilization effect by destroying the cell membrane.

[0018] Potassium oxide can kill pests or make them unable to survive. Chlorine dioxide disinfectant powder uses its strong oxidizing action to forcibly plunder electrons to oxidize and decompose amino acids in microorganisms, inhibit their growth and kill them, thereby achieving the purpose of killing pathogenic bacteria in the soil and distributing organic toxins in the soil.

[0019] The distribution ratio of each component in the soil sterilization and disinfection component is measured by weight percentage: 30-44% of citric acid, 5-8% of sodium benzoate, 0.5-0.9% of potassium oxide, and 46-61% of chlorine dioxide disinfection powder.

[0020] The raw materials used for soil oxygenation are as follows: the soil oxygenation component is calcium peroxide, which is in granular form with a particle size of 3-5mm. Calcium peroxide reacts with water to produce oxygen, and the process is relatively slow, which can achieve the effect of releasing oxygen for a long time.

[0021] The raw materials used for soil topdressing are as follows: the soil fertilization component is composed of superphosphate and urea, and the particle size is 3-5mm. Among them, the application of superphosphate in calcareous soil can significantly increase the effective phosphorus content of the soil and supplement the nutrients lacking in the raw soil. Its proportion accounts for 45-92% of the soil fertilization component by weight percentage. Urea is a high-concentration nitrogen fertilizer that can promote cell division and growth, making branches and leaves grow luxuriantly. Its proportion accounts for 8-55% of the soil fertilization component by weight percentage.

[0022] The raw material composition for adjusting soil pH is as follows: Aluminum sulfate is used as the soil pH modulation component, which hydrolyzes to form aluminum hydroxide and produces a small amount of dilute sulfuric acid solution, which can be used to adjust the soil pH value.

[0023] S2. The raw materials of each component are mixed evenly to prepare a bulk mixture, and the bulk mixture is sealed and stored in a low-temperature dry environment to obtain a composite improver suitable for regenerating green soil from engineering abandoned soil.

[0024] S3. First, break up the soil thoroughly, and mix it evenly according to the ratio of 1:11-1:15 of the composite improver suitable for regenerated green plant soil of engineering waste soil: engineering waste soil, and let it stand for 6-8 days to loosen the soil.

[0025] S4. The engineering waste soil with the composite improver suitable for regenerating green soil from engineering waste soil was used as the organic matrix. To ensure the full hydrolysis reaction of the raw materials, the moisture content of the mixed materials was controlled to be 45-55wt%. The Manila lawn was used as the reference vegetation to observe its germination rate and seedling height.

[0026] Embodiment 1 S1. 35% of citric acid, 6% of sodium benzoate, 0.5% of potassium oxide, 54.9% of chlorine dioxide disinfectant powder, 0.1% of calcium peroxide, 0.5% of superphosphate, 0.5% of urea and 2.5% of aluminum sulfate are mixed according to the weight percentage and converted into actual numbers to prepare powder or granules.

[0027] S2. The raw materials of each component are mixed evenly to prepare a bulk mixture, and the bulk mixture is sealed and stored in a low-temperature dry environment to obtain a composite improver suitable for regenerating green soil from engineering abandoned soil.

[0028] S3. Mix the prepared composite improver for regenerating green plant soil with engineering waste soil in a ratio of 1:12 and let it stand for 7 days.

[0029] S4. Add the composite improver suitable for regenerating green soil from engineering waste soil as the organic matrix, and control the moisture content of the mixed material to 50wt%. Take Manila lawn as the reference vegetation, and observe its germination rate and seedling height.

[0030] It can be observed that the germination rate and seedling growth of Manila grass seeds mixed with the composite improver for regenerating green plant soil from engineering waste soil prepared in this embodiment were significantly better than those of the control group not using the composite improver for regenerating green plant soil from engineering waste soil prepared in this embodiment.

[0031] Embodiment 2 S1. 44% citric acid, 6% sodium benzoate, 0.9% potassium oxide, 45.5% chlorine dioxide disinfectant powder, 0.1% calcium peroxide, 1% superphosphate, 0.5% urea, and 2% aluminum sulfate are mixed according to weight percentage and converted into actual numbers to prepare powder or granules.

[0032] S2. The raw materials of each component are mixed evenly to prepare a bulk mixture, and the bulk mixture is sealed and stored in a low-temperature dry environment to obtain a composite improver suitable for regenerating green soil from engineering abandoned soil.

[0033] S3. Mix the prepared composite improver for regenerating green plant soil with engineering waste soil in a ratio of 1:12 and let it stand for 7 days.

[0034] S4. Add the composite improver suitable for regenerating green soil from engineering waste soil as the organic matrix, and control the moisture content of the mixed material to 55wt%. Take Manila lawn as the reference vegetation, and observe its germination rate and seedling height.

[0035] It can be observed that the germination rate and seedling growth of Manila grass seeds mixed with the composite improver for regenerating green plant soil from engineering waste soil prepared in this embodiment were significantly better than those of the control group not using the composite improver for regenerating green plant soil from engineering waste soil prepared in this embodiment.

[0036] Therefore, the present invention adopts the above-mentioned composite improver and preparation method suitable for regenerating green plant soil from engineering waste soil, and improves it on the basis of the commonly used soil improver formula to provide a soil improver prepared from a variety of inorganic salts and organic raw materials. During the plant growth process, the new composite improver is mixed into the engineering waste soil to achieve the effects of improving soil structure and physical and chemical properties, improving crop disease resistance, sterilization, strengthening seedlings, increasing yield, and improving quality.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A composite improver suitable for regenerating green soil from engineering waste soil, characterized in that: The components include the following by weight percentage: sterilization component 81.5-97.5%, oxygenation component 0.06-0.14%, fertilization component 0.6-1.7%, pH adjustment component 1.7-2.7%; The sterilization and disinfection component is formed by a composite of citric acid, sodium benzoate, potassium oxide and chlorine dioxide powder, and the weight percentages of citric acid, sodium benzoate, potassium oxide and chlorine dioxide powder account for 30-44%, 5-8%, 0.5-0.9% and 46-61% of the sterilization and disinfection component respectively.

2. The composite improver suitable for regenerating green soil from engineering waste soil according to claim 1, characterized in that: The oxygen-enhancing component is calcium peroxide particles with a particle size of 3-5 mm; the fertilizing component is composed of superphosphate and urea with a particle size of 3-5 mm, which account for 45-92% and 8-55% of the fertilizing component by weight respectively; and the pH modulation component is aluminum sulfate.

3. A method for preparing a composite improver suitable for regenerating green soil from engineering waste soil as described in any one of claims 1-2, characterized in that: The following steps are involved: S1. The sterilization and disinfection component, the oxygenation component, the fertilization component and the pH modulation component are converted into actual weight percentages for mixing to prepare powders or granules; S2, mixing the raw materials of each component to prepare a bulk mixture, and sealing the prepared bulk mixture, and storing it in an environment with low temperature and dry conditions to obtain a composite improver suitable for regenerating green soil from engineering abandoned soil; S3, mix the prepared composite improver for regenerating green soil with engineering waste soil in a ratio of 1:11-1:15, and let it stand for 6-8 days; S4. Use the abandoned engineering soil with the addition of a composite improver suitable for regenerating green plant soil from abandoned engineering soil as the organic matrix, and take Manila lawn as the reference vegetation to observe its germination rate and seedling height.

4. The method for preparing a composite improver suitable for regenerating green soil from engineering waste soil according to claim 3, characterized in that: In step S3, before the prepared bulk mixture is mixed into the engineering waste soil, the soil is firstly fully broken up and then mixed and stirred with the prepared bulk mixture.

5. The method for preparing a composite improver suitable for regenerating green soil from engineering waste soil according to claim 3, characterized in that: In step S4, after the engineering waste soil to which the composite improver suitable for regenerating green plant soil from engineering waste soil is added is used as the organic matrix, the moisture content of the mixed material is controlled to be 45-55wt%.

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