A saline-alkali soil ecological restoration slurry, a preparation method and application thereof

Abstract

The application provides a desertification soil ecological restoration slurry and a preparation method and application thereof, and relates to the technical field of soil treatment. Guar gum powder is placed in water, heated and stirred to obtain a guar gum water solution with a mass concentration of 0.5-1%; triethanolamine and microcrystalline cellulose are sequentially added to the guar gum water solution, heated and stirred to obtain a mixed solution; chitosan and glycerol are added to the mixed solution, heated and stirred, and the mixture is cooled to room temperature to obtain the desertification soil ecological restoration slurry. The application uses guar gum, chitosan, microcrystalline cellulose, triethanolamine and glycerol as raw materials to prepare a green and environment-friendly desertification soil ecological restoration slurry, which can be used to restore desertification soil, significantly reduce soil water loss and promote plant growth.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soil remediation, in particular to a kind of sandy soil ecological restoration slurry and its preparation method and application. BACKGROUND

[0002] Soil desertification refers to the process of soil surface losing organic matter and nutrients due to dry climate, vegetation destruction and other reasons, becoming barren, loose and easily blown away by wind erosion. This phenomenon occurs worldwide, especially in arid and semi-arid regions. Therefore, effectively managing soil desertification is a serious ecological and environmental problem.

[0003] Using soil remediation agent to repair sandy soil is one of the effective solutions, for example, a kind of sandy soil improvement method is disclosed in patent CN103348838A, which is a solid organic matter that can be dissolved in water, forming a solution with cohesiveness and adhesion, then mixed with sandy soil to form; After water evaporation, the organic matter in it can bond sandy soil particles and can be dissolved in water again when encountering water, thus forming a solution with cohesiveness and adhesion to bond sandy soil particles. The sandy soil improved by the above method has certain stability and water storage capacity, and can provide growing conditions for plants, but this technology still has the problem of limited water storage capacity, and the organic matter used has certain environmental safety hazards.

[0004] Therefore, the present application provides a green and environmentally friendly technology that can significantly improve the physicochemical properties of improved sandy soil, thereby improving the survival rate of crops. SUMMARY

[0005] Based on this, the present application provides a kind of sandy soil ecological restoration slurry and its preparation method and application. The present application is to use guar gum, chitosan, microcrystalline cellulose, triethanolamine and glycerol as raw materials to prepare a kind of green and environmentally friendly sandy soil ecological restoration slurry, which is used to improve sandy soil, can significantly reduce soil water loss and promote plant growth.

[0006] The preparation method of the sandy soil ecological restoration slurry according to the present application comprises the following steps:

[0007] (1) Put guar gum powder into water, heat and stir until uniform to obtain a guar gum aqueous solution with a mass concentration of 0.5% to 1%;

[0008] (2) Add triethanolamine and microcrystalline cellulose to the guar gum aqueous solution in sequence, heat and stir until uniform to obtain a mixed solution;

[0009] (3) Add chitosan and glycerol to the mixed solution, heat and stir until uniform, and cool to room temperature to obtain a sandy soil ecological restoration slurry.

[0010] Guar gum is a non-ionic galactomannan extracted from the endosperm of the legume Cyamopsis tetragonoloba. Guar gum and its derivatives have good water solubility. In step (1), the guar gum aqueous solution is prepared by heating treatment, so that the guar gum can be quickly water-soluble, thereby improving the dispersibility and stability of the aqueous solution. Preferably, the heating temperature in step (1) is 40℃, the stirring speed is 600-1200 rpm, and the stirring time is 2h.

[0011] Microcrystalline cellulose is a purified, partially depolymerized cellulose, white, odorless, tasteless, crystalline powder composed of porous particles. It can be used as an anti-caking agent, an emulsifier, a dispersant, an adhesive, a tabletting agent and a tissue improver; it can also be used as a heat stabilizer and a carrier for rapid drying. Triethanolamine is hygroscopic, colorless and viscous liquid at room temperature, slightly ammonia odor, easily soluble in water and ethanol. Triethanolamine has alkalinity, can absorb CO2 and H2S, and its aqueous solution is alkaline, can react with various acids to generate ester, amide salt, and can also form lipids with higher fatty acids. In the present application, triethanolamine is used to activate microcrystalline cellulose, and microcrystalline cellulose can be mixed and cross-linked with guar gum to form an interpenetrating network. Preferably, the mass concentration of microcrystalline cellulose in the mixed solution in step (2) is 0.05%-0.2%; preferably, the volume ratio of the amount of triethanolamine added to the guar gum aqueous solution in step (2) is 1:2000-5000.

[0012] In order to make the microcrystalline cellulose and triethanolamine fully dispersed in the guar gum aqueous solution, the heating temperature in step (2) is 50℃, the stirring speed is 600-1200 rpm, and the stirring time is 0.5h.

[0013] In order to further consolidate the interpenetrating network structure formed, chitosan and glycerol are added. The mass of chitosan added is 0.05%-0.2%, and the volume ratio of the amount of glycerol added to the mixed solution is 1:200-1000. In order to further improve the dispersibility and stability of the prepared sandification soil ecological restoration slurry, the heating temperature in step (3) is controlled to be 50℃, the stirring speed is 300-800 rpm, and the stirring time is 0.5h.

[0014] The present application also provides the use of the sandification soil ecological restoration slurry, which is mixed with sandification soil at a volume ratio of 1:5-8.

[0015] Compared with the prior art, the present application has the following beneficial effects: the present application uses natural raw materials such as guar gum, chitosan and microcrystalline cellulose to prepare the desertification soil ecological restoration slurry, which is less polluting, green and environmentally friendly, and is more conducive to the recovery of vegetation. The desert soil improved by the desertification soil ecological restoration slurry has a slower water loss rate and a higher ryegrass seed germination rate. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The water retention performance of the modified desert soil 1, the modified desert soil 2 and the ordinary desert soil;

[0017] Figure 2 The germination rate of the modified desert soil and the ordinary desert soil for planting ryegrass. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the present application clearer, the preferred embodiments of the present application are further described in detail below in combination with examples.

[0019] Example 1

[0020] A desertification soil ecological restoration slurry is prepared by the following method:

[0021] (1) Guar gum powder is placed in water, heated and stirred at 40℃ for 2h, wherein the stirring speed is 1000rpm, to obtain a guar gum aqueous solution with a mass concentration of 1%;

[0022] (2) Triethanolamine and microcrystalline cellulose are sequentially added to the guar gum aqueous solution, heated and stirred at 50℃ for 0.5h, wherein the stirring speed is 1200rpm, to obtain a mixed solution; wherein the mass concentration of microcrystalline cellulose in the mixed solution is 0.1%; the volume ratio of the amount of triethanolamine added to the volume of the guar gum aqueous solution is 1:2000;

[0023] (3) Chitosan and glycerol are added to the mixed solution, heated and stirred at 50℃ for 0.5h, wherein the stirring speed is 500rpm, and the desertification soil ecological restoration slurry is obtained after cooling to room temperature; wherein the added mass of chitosan is 0.1%, and the volume ratio of the amount of glycerol added to the volume of the mixed solution is 1:200.

[0024] Example 2

[0025] A desertification soil ecological restoration slurry is prepared by the following method:

[0026] (1) Guar gum powder is placed in water, heated and stirred at 40℃ for 2h, wherein the stirring speed is 1000rpm, to obtain a guar gum aqueous solution with a mass concentration of 0.5%;

[0027] (2) adding triethanolamine and microcrystalline cellulose into the guar gum aqueous solution in sequence, heating and stirring at 50°C for 0.5h, wherein the stirring speed is 1200rpm, to obtain a mixed solution; wherein the mass concentration of the microcrystalline cellulose in the mixed solution is 0.2%; the volume ratio of the added amount of triethanolamine to the guar gum aqueous solution is 1:1000;

[0028] (3) adding chitosan and glycerol into the mixed solution, heating and stirring at 50°C for 0.5h, wherein the stirring speed is 500rpm, to obtain the sandy soil ecological restoration slurry after cooling to room temperature; wherein the added mass of chitosan is 0.2%, and the volume ratio of the added amount of glycerol to the mixed solution is 1:500.

[0029] Example 3

[0030] A sandy soil ecological restoration slurry is prepared by the following method:

[0031] (1) placing guar gum powder into water, heating and stirring at 40°C for 2h, wherein the stirring speed is 1000rpm, to obtain a guar gum aqueous solution with a mass concentration of 0.5%;

[0032] (2) adding triethanolamine and microcrystalline cellulose into the guar gum aqueous solution in sequence, heating and stirring at 50°C for 0.5h, wherein the stirring speed is 1200rpm, to obtain a mixed solution; wherein the mass concentration of the microcrystalline cellulose in the mixed solution is 0.05%; the volume ratio of the added amount of triethanolamine to the guar gum aqueous solution is 1:200;

[0033] (3) adding chitosan and glycerol into the mixed solution, heating and stirring at 50°C for 0.5h, wherein the stirring speed is 500rpm, to obtain the sandy soil ecological restoration slurry after cooling to room temperature; wherein the added mass of chitosan is 0.2%, and the volume ratio of the added amount of glycerol to the mixed solution is 1:1000.

[0034] Example 4

[0035] A sandy soil ecological restoration slurry is prepared by the following method:

[0036] (1) placing guar gum powder into water, heating and stirring at 40°C for 2h, wherein the stirring speed is 1000rpm, to obtain a guar gum aqueous solution with a mass concentration of 0.5%;

[0037] (2) adding triethanolamine and microcrystalline cellulose into the guar gum aqueous solution in sequence, heating and stirring at 50°C for 0.5h, wherein the stirring speed is 1200rpm, to obtain a mixed solution; wherein the mass concentration of the microcrystalline cellulose in the mixed solution is 0.2%; the volume ratio of the added amount of triethanolamine to the guar gum aqueous solution is 1:300;

[0038] (3) adding chitosan and glycerol into the mixed solution, heating and stirring at 50°C for 0.5h, wherein the stirring speed is 500rpm, and obtaining the sandy soil ecological restoration slurry after cooling to room temperature; wherein the added mass of chitosan is 0.05%, and the volume ratio of the added amount of glycerol to the mixed solution is 1:800.

[0039] Comparative Example 1

[0040] A sandy soil ecological restoration slurry is prepared by the following method:

[0041] (1) placing guar gum powder in water, heating and stirring at 40°C for 2h, wherein the stirring speed is 1000rpm, and obtaining a guar gum aqueous solution with a mass concentration of 1%;

[0042] (2) adding triethanolamine into the guar gum aqueous solution in sequence, heating and stirring at 50°C for 0.5h, wherein the stirring speed is 1200rpm, and obtaining a mixed solution; wherein the volume ratio of the added amount of triethanolamine to the guar gum aqueous solution is 1:2000;

[0043] (3) adding glycerol into the mixed solution, heating and stirring at 50°C for 0.5h, wherein the stirring speed is 500rpm, and obtaining the sandy soil ecological restoration slurry after cooling to room temperature; wherein the volume ratio of the added amount of glycerol to the mixed solution is 1:200.

[0044] The sandy soil ecological restoration slurries prepared by Example 1 and Comparative Example 1 are used to treat sandy soil respectively, and the specific treatment method is to mix the sandy soil ecological restoration slurry with the sandy soil in a volume ratio of 1:8. The sandy soil improved by the sandy soil ecological restoration slurry prepared by Example 1 is marked as modified sandy soil 1, and the sandy soil improved by the sandy soil ecological restoration slurry prepared by Comparative Example 1 is marked as modified sandy soil 2. A control group is added, wherein the control group is to mix the unimproved sandy soil with water in a volume ratio of 8:1, and then obtain ordinary sandy soil.

[0045] The modified sandy soil 1 and the modified sandy soil 2 as well as the ordinary sandy soil are subjected to soil water retention capacity experiment, and the specific experimental method is as follows:

[0046] The above sandy soils are weighed and recorded, and then placed in a 25°C oven for heat preservation, and the air blowing is turned off. Then the soil weight is recorded until the weight is unchanged. The results are as follows: Figure 1As shown in Figure 6, the quality of the sandy soil modified by the sandy soil ecological restoration slurry of Example 1 is stable at about 96 hours, indicating that the water in the sandy soil needs about 4 days to completely lose, while the ordinary sandy soil loses all water in about 48 hours. This experimental result shows that the water retention performance of the sandy soil modified by the sandy soil ecological restoration slurry of the present application is improved, which is more conducive to the recovery of vegetation. Figure 1 As can also be seen from Figure 6, the water retention performance of modified sandy soil 1 is stronger than that of modified sandy soil 2.

[0047] The sandy soil ecological restoration slurry prepared in Example 2 was mixed with sandy soil at a volume ratio of 1:8 to obtain modified sandy soil. The modified sandy soil and the above ordinary sandy soil were respectively planted with rye grass to observe the seed germination. The specific planting method is as follows:

[0048] The rye grass seeds were respectively planted in the above sandy soil and placed in a 25°C dark light-proof environment for seed germination experiment. The number of germinated seeds was counted every day, and no additional water was supplied during the period. The results are shown in Figure 7. Figure 2 As shown in Figure 7, the germination rate of rye grass in the sandy soil modified by the sandy soil ecological restoration slurry reached 92%, while the germination rate of rye grass in the unmodified sandy soil was 48%, indicating that the sandy soil modified by the present application is more conducive to the germination of rye grass seeds.

[0049] The above-described examples are part of the embodiments of the present application, rather than all the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

Claims

1. A method for preparing a slurry for ecological rehabilitation of a sandy soil, characterized in that, The method comprises the following steps: (1) placing guar gum powder in water, heating and stirring to obtain a guar gum aqueous solution with a mass concentration of 0.5%-1%; (2) sequentially adding triethanolamine and microcrystalline cellulose to the guar gum aqueous solution, heating and stirring to obtain a mixed solution; (3) adding chitosan and glycerol to the mixed solution, heating and stirring, and cooling to room temperature to obtain a sandy soil ecological restoration slurry.

2. The method for preparing the sand soil ecological restoration slurry according to claim 1, characterized in that, In step (1), the heating temperature is 40°C, the stirring speed is 600-1200 rpm, and the stirring time is 2 h.

3. The method of claim 1, wherein the sand soil ecological restoration slurry is prepared by mixing the sand soil ecological restoration agent with water in a ratio of 1: 1 to 1:

10. In step (2), the heating temperature is 50°C, the stirring speed is 600-1200 rpm, and the stirring time is 0.5 h.

4. The method of claim 1, wherein the sand soil ecological restoration slurry is prepared by mixing the sand soil ecological restoration agent with water in a ratio of 1: 1 to 1:

10. In step (2), the mass concentration of microcrystalline cellulose in the mixed solution is 0.05%-0.2%.

5. The method of claim 1, wherein the sand soil ecological restoration slurry is prepared by mixing the sand soil ecological restoration agent with water in a ratio of 1: 1 to 1:

10. In step (2), the volume ratio of the amount of triethanolamine added to the volume of the guar gum aqueous solution is 1:2000-5000.

6. The method of claim 1, wherein the sand soil ecological restoration slurry is prepared by mixing the sand soil ecological restoration agent with water in a ratio of 1: 1 to 1:

10. In step (3), the heating temperature is 50°C, the stirring speed is 300-800 rpm, and the stirring time is 0.5 h.

7. The method of claim 1, wherein the sand soil ecological restoration slurry is prepared by mixing the sand soil ecological restoration agent with water in a ratio of 1: 1 to 1:

10. In step (3), the volume ratio of the amount of glycerol added to the volume of the mixed solution is 1:200-1000.

8. The method of claim 1, wherein the sand soil ecological restoration slurry is prepared by mixing the sand soil ecological restoration agent with water in a ratio of 1: 1 to 1:

10. In step (3), the mass concentration of chitosan in the sandy soil ecological restoration slurry is 0.05%-0.2%.

9. A slurry for ecological rehabilitation of a desertified soil, characterized in that it comprises: The sandy soil ecological restoration slurry is prepared by any one of the methods of claims 1-8.

10. Use of the slurry for ecological restoration of sandy soils according to claim 1, characterized by that, The sandy soil ecological restoration slurry is mixed with sandy soil at a volume ratio of 1:5-8.

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