Efficient and environment-friendly saline-alkali soil modifier preparation device

Abstract

The utility model relates to the technical field of saline-alkali soil improvers, in particular to an efficient and environment-friendly saline-alkali soil improver preparation device. The device comprises a first mixing cylinder, a vacuum drying box and a second mixing cylinder. The first mixing cylinder comprises a first cylinder body, a first feeding port formed in the top of the first cylinder body, a first discharging port formed in the bottom of the first cylinder body, a first stirring assembly arranged in the first cylinder body and a temperature control assembly arranged in the first cylinder body. The vacuum drying box comprises a machine body, a vacuum chamber installed on the upper portion in the machine body and a vacuumizing assembly installed on the lower portion in the machine body. The second mixing cylinder comprises a second cylinder body, a second feeding hole formed in the top of the second cylinder body, a second discharging hole formed in the bottom of the second cylinder body, and a second stirring assembly arranged in the second cylinder body.

Description

TECHNICAL FIELD

[0001] The utility model relates to saline-alkali soil modifier technical field especially relates to a kind of efficient environmental protection's saline-alkali soil modifier preparation device. BACKGROUND

[0002] With the increasingly serious global environmental problems, the management and improvement of saline-alkali soil become the key issue of sustainable development of agriculture. The temperature control of the traditional saline-alkali soil modifier preparation device usually depends on a single heating or cooling system, which causes uneven temperature distribution inside the mixing cylinder, resulting in local overheating or overcooling phenomenon affecting the mixing effect of microbial inoculant and materials, and further affecting the quality and stability of the final product. In addition, the shaft center of the stirring mechanism in the cylinder deviates due to rotation during stirring, which further causes uneven stirring and poor material mixing effect. SUMMARY

[0003] The utility model overcomes the insufficient of prior art, provides a kind of efficient environmental protection's saline-alkali soil modifier preparation device.

[0004] To achieve the above purpose, the utility model adopts the technical scheme that:

[0005] A kind of efficient environmental protection's saline-alkali soil modifier preparation device, including first mixing cylinder, vacuum drying oven and second mixing cylinder;

[0006] The first mixing cylinder includes a first cylinder body, a first feed inlet disposed at the top of the first cylinder body, a first discharge outlet disposed at the bottom of the first cylinder body, a first stirring assembly disposed inside the first cylinder body, and a temperature control assembly disposed inside the first cylinder body.

[0007] The vacuum drying oven includes a machine body, a vacuum chamber installed at the upper part inside the machine body, and a vacuum pumping assembly installed at the lower part inside the machine body.

[0008] The second mixing cylinder includes a second cylinder body, a second feed inlet disposed at the top of the second cylinder body, a second discharge outlet disposed at the bottom of the second cylinder body, and a second stirring assembly disposed inside the second cylinder body.

[0009] In a preferred embodiment of the utility model, the temperature control assembly includes a medium pipe. The medium pipe is spirally wound around the axis of the first mixing cylinder and abuts against the inner wall of the first mixing cylinder. The first end and the last end of the medium pipe extend outward through the inner wall of the first mixing cylinder to form a medium inlet and a medium outlet, respectively.

[0010] In a preferred embodiment of the utility model, the first stirring assembly comprises a stirring shaft arranged in the first mixing cylinder, a stirring paddle arranged at the bottom of the stirring shaft, a positioning seat arranged at the bottom of the first mixing cylinder, and a first power unit arranged at the top of the first mixing cylinder; the positioning seat comprises a plurality of supports abutting against the inner wall of the first mixing cylinder and a shaft seat fixed at the top of the support leg; the top end of the stirring shaft is connected with the first power unit, and the tail end is rotatably arranged in the center of the shaft seat.

[0011] In a preferred embodiment of the utility model, a hollow jacket is arranged on the lateral side of the first mixing cylinder, and the jacket is provided with a liquid inlet and a liquid outlet.

[0012] In a preferred embodiment of the utility model, a ventilation assembly is further arranged in the first mixing cylinder; the ventilation assembly comprises a mounting support fixed on the inner wall of the first mixing cylinder and a ventilation pipe fixed on the mounting support; one end of the ventilation pipe is close to the bottom of the first mixing cylinder, and the other end extends outward from the top of the first mixing cylinder.

[0013] In a preferred embodiment of the utility model, a sampling valve is further arranged at the bottom of the first mixing cylinder.

[0014] In a preferred embodiment of the utility model, a window is further arranged on the first mixing cylinder for observing the inside of the cylinder.

[0015] The utility model solves the defects in the background art and has the following beneficial effects:

[0016] (1) The temperature control assembly comprises a medium pipe, the medium pipe is helically arranged around the axis of the first mixing cylinder, heat transfer medium is introduced into the medium pipe during use, and the temperature in the first mixing cylinder is controlled through the circulation of the heat transfer medium. The helical medium pipe can uniformly distribute heat, avoid local overheating or overcooling, and ensure that the materials are mixed at an appropriate temperature.

[0017] (2) The first stirring assembly comprises a stirring shaft arranged in the first mixing cylinder, a stirring paddle arranged at the bottom of the stirring shaft, a positioning seat arranged at the bottom of the first mixing cylinder, and a first power unit arranged at the top of the first mixing cylinder. The positioning seat comprises a plurality of supports abutting against the inner wall of the first mixing cylinder and a shaft seat fixed at the top of the support leg; the top end of the stirring shaft is connected with the first power unit, and the tail end is rotatably arranged in the center of the shaft seat. The positioning seat is used to ensure the stable operation of the stirring shaft and prevent uneven stirring caused by the movement of the stirring shaft during stirring. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model will be further described in connection with the drawings and embodiments;

[0019] Figure 1It is a flow chart of a preparation method of a high-efficiency and environmentally-friendly saline-alkali soil improver.

[0020] Figure 2 It is a structural schematic diagram of a preparation device of a high-efficiency and environmentally-friendly saline-alkali soil improver.

[0021] Figure 3 It is a structural schematic diagram of a first mixing cylinder.

[0022] Figure 4 It is a structural schematic diagram of a vacuum drying oven.

[0023] Figure 5 It is a structural schematic diagram of a second mixing cylinder.

[0024] In the figure: 1, first mixing cylinder; 2, vacuum drying oven; 3, second mixing cylinder; 11, first cylinder body; 12, first feeding port; 13, first discharging port; 14, first stirring assembly; 15, temperature control assembly; 16, jacket; 17, aeration assembly; 18, sampling valve; 19, sight window; 21, machine body; 22, vacuum chamber; 23, vacuum pumping assembly; 31, second cylinder body; 32, second feeding port; 33, second discharging port; 34, second stirring assembly; 141, stirring shaft; 142, stirring paddle; 143, positioning seat; 144, first power unit; 151, medium pipe; 152, medium inlet; 153, medium outlet; 161, liquid inlet; 162, liquid outlet; 171, mounting bracket; 172, aeration pipe; 1431, bracket; 1432, shaft seat. DETAILED DESCRIPTION

[0025] The utility model will be explained in further detail in combination with the drawings and embodiments, these drawings are all simplified schematic diagrams, only with the schematic way the basic structure of the utility model is explained, therefore it only shows the related structure of the utility model.

[0026] SUMMARY

[0027] Saline-alkali soil improver is a kind of additive for improving soil properties, divided into natural improver, artificial synthetic improver, biological improver and composite improver, wherein natural improver utilizes inherent inorganic and organic material, artificial synthetic improver includes high molecular polymer, and biological improver is based on the symbiotic relationship between microorganism and plant.These improvers play an important role in improving soil quality and promoting agricultural production, but also have certain limitations, such as biological improver may be limited by soil environment, and artificial synthetic material may face degradation problem.Therefore, research and development of soil improvement scheme suitable for the resources and cultivation characteristics of specific region have important significance for improving degraded soil and increasing cultivated land area.

[0028] The high-efficiency and environment-friendly saline-alkali soil improver provided by the application is suitable for carbonate type saline-alkali soil, and the soil usually has a high pH value and contains more carbonates and bicarbonates.

[0029] The titanium gypsum in the application is an industrial by-product, and the main component is calcium sulfate, which has the ability to neutralize soil alkalinity, and can reduce the pH value of soil by reacting with alkaline substances in the soil; the microbial agent can promote the decomposition and circulation of organic matter in the soil, improve the biological activity and fertility of the soil, and reduce the alkalinity of the soil; the amino acid is a nutrient substance necessary for plant growth, which can be directly absorbed and utilized by plants, promotes plant growth, and at the same time forms a chelate with multivalent metal ions in the soil to improve the granular structure of the soil; the sediment is a soil deposited in slow or still water after physical and chemical action and biological reaction process, which can improve the physical and chemical properties of the soil, and improve the soil fertility and aggregation degree.

[0030] The biochar in the application is a mesoporous material, and the production process includes hydrothermal carbonization, pyrolysis, gasification and biomass boiler combustion. Among them, the hydrothermal carbonization is a thermochemical process in the temperature range of 180-375 DEG C, in which process, the biomass is in a subcritical or supercritical water environment, and automatically generates pressure (2-6 MPa) in a closed system, and realizes the conversion of high-moisture biomass into hydrothermal carbon in a short time (from a few minutes to a few hours); pyrolysis refers to a process for preparing biochar from biomass raw materials at a temperature of 300-1200 DEG C in an oxygen-free or limited oxygen atmosphere; gasification is a thermochemical process for preparing biochar at a higher temperature (> 500 DEG C) and under anaerobic conditions; biomass boiler combustion refers to a combustion reactor mainly by heating biomass in the presence of oxygen, and the gas produced near the biomass is combusted, and since the combustion technology usually does not cause complete combustion, biochar can be obtained therefrom.

[0031] The spray drying method mentioned in the application is a drying technology that atomizes liquid materials into small droplets and contacts with hot air to quickly evaporate water. The advantages of this method are that the drying speed is fast, usually only a few seconds are needed, and the solution, emulsion can be directly dried into powder or granular product, and in the spray drying process, the temperature of the droplets is relatively low, which can reduce the denaturation and loss of heat-sensitive materials. The vacuum drying method is a drying method carried out under reduced pressure, and by reducing the pressure, water can be removed at a lower temperature, reducing the oxidation and thermal damage of the material and maintaining its original properties. The freeze-drying method is to freeze the water-containing material into a solid first, and then under the conditions of low temperature and low pressure, the water is directly sublimated into steam, so as to achieve the purpose of drying.

[0032] The exemplary culture conditions of various bacterial agents in the application are as follows:

[0033] The alkali-resistant Bacillus is cultured in beef extract peptone medium (NA) at 30°C for 24-36 h, with pH controlled at about 8.

[0034] The culture medium for Bacillus licheniformis is composed of α-lactose 2 g / L, soybean meal 20 g / L, MnSO4 1 g / L, FeSO4 0.01 g / L, MgSO4 0.04 g / L, and K2HPO4 2 g / L, and the culture conditions are inoculum 4%, culture time 24-48 h, and initial pH 7. In a 50 L fermenter, the maximum viable cell count is 1.36×10^9 CFU / mL.

[0035] The Bacillus megaterium is cultured in beef extract peptone medium (NA) with pH ranging from 4.8 to 9.0, and the pH value shows a trend of first decreasing and then increasing during the culture process. The culture temperature is 30°C in the early stage and is increased to 36°C in the later stage, and the culture time is 24-48 h.

[0036] The Azotobacter is cultured in Yersin medium with pH controlled at 8-10. According to the detection of nitrogen fixation activity, the culture time is 24-36 h.

[0037] The Trichoderma is grown on potato dextrose agar (PDA) medium composed of potato, glucose, and agar, with pH and culture time being 3-7 days.

[0038] The salt-tolerant Actinomyces is cultured in ISP-1 medium with 1-2% NaCl solution added, pH ranging from 6 to 8, culture temperature being 25-37°C, and culture time being 24-48 h.

[0039] The lactic acid bacteria are grown in MRS medium, and a buffer is added to adjust the pH to 6.6 after 2.5 hours of fermentation. Then, the original fermentation liquid is added with an equal volume of nutrient factors (whey: tomato juice: carrot juice: milk = 4:6:6:5) for 4 hours of fermentation.

[0040] Exemplary method

[0041] As shown in Figure 1 A high-efficiency and environmentally-friendly saline-alkali soil improvement agent preparation method includes the following steps:

[0042] S1, a plurality of microbial agents are respectively placed in culture media for culture, and after the culture period ends, the microbial agents are mixed to obtain a composite microbial agent;

[0043] S2, carboxymethyl cellulose sodium is dissolved in distilled water for modification treatment to obtain a modified carboxymethyl cellulose sodium solution;

[0044] S3, the modified carboxymethyl cellulose sodium solution, sodium alginate, and chitosan are mixed to obtain a coating solution;

[0045] S4, mixing the complex microbial inoculant, glucose solution, biochar and coating liquid, stirring and dispersing, and then drying to obtain a complex biological agent;

[0046] S5, mixing the bottom mud, titanium gypsum, complex biological agent, amino acid, phosphate rock powder and iron fertilizer to obtain a saline-alkali soil improver.

[0047] In the following, each step will be described in detail.

[0048] The microbial inoculant in step S1 includes one or more of alkali-tolerant Bacillus, Bacillus licheniformis, Bacillus mucilaginosus, nitrogen-fixing bacteria, Trichoderma, salt-tolerant actinomycetes and lactic acid bacteria.

[0049] The preparation method of the modified sodium carboxymethyl cellulose solution in step S2 is as follows: after dissolving sodium carboxymethyl cellulose in distilled water, nitrogen is introduced to remove air, and the temperature is raised to 65-75°C. Potassium persulfate is added and stirred for 20-40 min; γ-aminobutyric acid and magnesium sulfate are added in turn, and stirred and heated at 65-75°C for 2-4 h; cooled to 20-26°C, and stand for 40-60 min to obtain the modified sodium carboxymethyl cellulose solution.

[0050] The preparation method of the coating liquid in step S3 is as follows: mix the modified sodium carboxymethyl cellulose solution, sodium alginate and chitosan, heat the mixed solution to 50-60°C and stir; after all components are completely dissolved, add 1%-3% glycerol to adjust the viscosity and moisture retention of the coating liquid, and add 1%-3% calcium chloride solution to adjust the strength and stability of the coating liquid; wherein the viscosity of the modified sodium carboxymethyl cellulose solution is between 10-50 mPa.s; the mass ratio of the modified sodium carboxymethyl cellulose solution, sodium alginate, chitosan, glycerol and calcium chloride solution in the coating liquid is 40-80%, 12-25%, 12-25%, 3-8% and 3-8% respectively.

[0051] The preparation method of the biochar in step S4 is hydrothermal carbonization or biomass boiler combustion.

[0052] The mass ratio of the complex microbial inoculant, glucose solution, biochar and coating liquid in step S4 is 20-40%, 5-15%, 20-40% and 20-40% respectively; the drying method of the mixture is one of spray drying, vacuum drying and freeze drying.

[0053] The mass ratio of the bottom mud, titanium gypsum, complex biological agent, amino acid, phosphate rock powder and iron fertilizer in step S5 is 25-40%, 35-50%, 15-25%, 5-10%, 6-12% and 6-12% respectively.

[0054] Exemplary device

[0055] As Figure 2 shown in the figure, a kind of efficient environmental protection's saline-alkali soil improvement agent preparation device, including first mixing cylinder 1, vacuum drying oven 2 and second mixing cylinder 3, by mixing raw materials in first mixing cylinder 1, then by vacuum drying oven 2 drying, finally further processing in second mixing cylinder 3.

[0056] First mixing cylinder 1 includes first cylinder body 11, first feed inlet 12 being arranged at the top of first cylinder body 11, first discharge port 13 being arranged at the bottom of first cylinder body 11, first stirring assembly 14 being arranged in the inside of first cylinder body 11 and temperature control assembly 15 being arranged in the inside of first cylinder body 11;

[0057] Vacuum drying oven 2 includes machine body 21, vacuum chamber 22 being installed in the upper portion of machine body 21 and vacuum extraction assembly 23 being installed in the lower portion of machine body 21;

[0058] Second mixing cylinder 3 includes second cylinder body 31, second feed inlet 32 being arranged at the top of second cylinder body 31, second discharge port 33 being arranged at the bottom of second cylinder body 31, second stirring assembly 34 being arranged in second cylinder body 31.

[0059] Temperature control assembly 15 includes medium pipe 151;Medium pipe 151 is helically around the axis of first mixing cylinder 1, and abuts with the inner wall of first mixing cylinder 1;The first end and the last end of medium pipe 151 extend outwardly through the inner wall of first mixing cylinder 1 to form medium inlet 152 and medium outlet 153 respectively. By setting helical medium pipe 151, and circulating medium in medium pipe 151, heat is evenly distributed, and the temperature in first mixing cylinder 1 is controlled.

[0060] First stirring assembly 14 includes stirring shaft 141 being arranged in first mixing cylinder 1, stirring paddle 142 being arranged at the bottom of stirring shaft 141, positioning seat 143 being arranged at the bottom of first mixing cylinder 1 and first power unit 144 being arranged at the top of first mixing cylinder 1;Positioning seat 143 includes a plurality of supports 1431 abutting with the inner wall of first mixing cylinder 1 and shaft seat 1432 being fixed at the top of support leg 1431;The top end of stirring shaft 141 is power-connected with first power unit 144, and the end is rotatably penetrated in the center of shaft seat 1432. First power unit 144 provides power for the rotation of stirring shaft 141, and the rotation of stirring shaft 141 drives the rotation of stirring paddle 142, so as to mix the materials in first mixing cylinder 1.

[0061] First mixing cylinder 1 side is further provided with internally hollow jacket 16, and inlet 161 and outlet 162 are arranged on jacket 16. The fluid in jacket 16 circulates, and cooperates with medium pipe 151 to further control the temperature in first mixing cylinder 1.

[0062] The first mixing cylinder 1 is also provided with a ventilation assembly 17; the ventilation assembly 17 includes a mounting bracket 171 fixed on the inner wall of the first mixing cylinder 1 and a ventilation pipe 172 fixed on the mounting bracket 171; one end of the ventilation pipe 172 is close to the bottom of the first mixing cylinder 1, and the other end extends outward from the top of the first mixing cylinder 1 and is connected to an external air source. The ventilation pipe 172 is used to ventilate the first mixing cylinder 1 to remove the air in the mixed liquid.

[0063] The bottom of the first mixing cylinder 1 is also provided with a sampling valve 18 for sampling.

[0064] The first mixing cylinder 1 is also provided with a viewing window 19 for observing the inside of the cylinder. By installing a transparent viewing window 19 on the first mixing cylinder 1, the inside of the cylinder can be directly observed, which is convenient for the operator to monitor and adjust.

[0065] In use, distilled water and sodium carboxymethyl cellulose are introduced into the first mixing cylinder 1 through the first feed port 12, nitrogen is introduced into the sodium carboxymethyl cellulose solution through the ventilation pipe 172, and a circulating medium is introduced into the medium pipe 151 through the medium inlet 152, so that the temperature in the cylinder is heated to 65-75℃. Potassium persulfate is added through the first feed port 12, the first power unit 144 is started to control the rotation of the stirring shaft 141 and the stirring paddle 142 around the axis of the positioning seat 143, and the stirring is maintained for 20-40min under the above conditions. After stirring, γ-aminobutyric acid and magnesium sulfate are added through the first feed port 12, and the stirring and heating are continued at a temperature of 65-75℃ for 2-4h. After the stirring is completed, the circulating medium is introduced into the medium pipe 151 through the medium inlet 152 to reduce the temperature in the cylinder to 20-26℃, and the mixture is left to stand for 40-60min to obtain a modified sodium carboxymethyl cellulose solution.

[0066] Sodium alginate and chitosan are added into the first mixing cylinder 1 through the first feed port 12, and the temperature in the cylinder is controlled at 50-60℃ and stirred. Glycerol and calcium chloride solution are continuously added to the stirred solution through the first feed port 12 to obtain a modified sodium carboxymethyl cellulose solution.

[0067] A pre-configured compound microbial agent, biochar and glucose solution are added into the first mixing cylinder 1 through the first feed port 12, and the mixture is uniformly mixed to obtain a compound biological agent. The compound biological agent is placed in the vacuum chamber 22 of the vacuum drying box 2, and the vacuum drying assembly 23 is started to dry the compound biological agent to obtain a dried compound biological agent.

[0068] The dried compound biological agent, pre-prepared bottom mud, titanium gypsum, amino acid, phosphate rock powder and iron fertilizer are added into the second mixing cylinder 3 through the second feed port 31, and the second stirring assembly 34 of the second mixing cylinder 3 is started to stir the above-mentioned materials, and finally a high-efficiency and environmentally-friendly saline-alkali soil improver is collected through the second discharge port 32.

[0069] Throughout the whole process, the inside of the first mixing cylinder 1 is monitored through the window 19, and the mixing conditions are adjusted in time according to the inside of the cylinder to ensure the mixing effect. At the same time, sampling detection is carried out through the sampling valve 18 to ensure that the product obtained by each operation is accurate. In addition, through the cooperation of the fluid circulation in the jacket 16 and the medium pipe 151, the temperature in the first mixing cylinder 1 is accurately controlled to ensure the mixing effect of the materials.

[0070] Exemplary reagents

[0071] A high-efficiency and environmentally-friendly saline-alkali soil improver is prepared by the above-mentioned method.

[0072] Example 1

[0073] In this embodiment, acid phosphogypsum is used as a saline-alkali soil improver.

[0074] Example 2

[0075] S1, the alkali-resistant Bacillus, Bacillus licheniformis, Bacillus mucilaginosus, nitrogen-fixing bacteria, Trichoderma, salt-tolerant actinomycetes and lactic acid bacteria are respectively placed in the culture medium for cultivation, and each type of bacterial agent with more than 100 million effective viable bacteria per milliliter is obtained. Mix the various types of bacterial agents to obtain a composite microbial agent.

[0076] S2, the composite microbial agent, glucose solution and hydrothermal carbon are mixed in a feeding ratio of 2:1:4, stirred and dispersed, and then dried to obtain a composite biological agent.

[0077] S5, the bottom mud, titanium gypsum, composite biological agent and amino acid are mixed uniformly in a feeding ratio of 3:7:3:1 to obtain a saline-alkali soil improver.

[0078] Example 3

[0079] S1, the alkali-resistant Bacillus, Bacillus licheniformis, Bacillus mucilaginosus, nitrogen-fixing bacteria, Trichoderma, salt-tolerant actinomycetes and lactic acid bacteria are respectively placed in the culture medium for cultivation, and each type of bacterial agent with more than 100 million effective viable bacteria per milliliter is obtained. Mix the various types of bacterial agents to obtain a composite microbial agent.

[0080] S2, sodium carboxymethyl cellulose is dissolved in distilled water, nitrogen is introduced to remove air, heated to 70℃, potassium persulfate is added, and stirred for 20min; γ-aminobutyric acid and magnesium sulfate are added in turn, and stirred and heated at 70℃ for 2h; cooled to 20℃, and stand for 60min to obtain a modified sodium carboxymethyl cellulose solution.

[0081] S3, the modified sodium carboxymethyl cellulose solution, sodium alginate and chitosan are mixed according to the feeding ratio of 6:1:1, the mixed solution is heated to 60 DEG C and stirred for 15 min. After all the ingredients are completely dissolved, 3% glycerol and 3% calcium chloride solution are added respectively.

[0082] S4, the composite microbial agent, glucose solution, hydrothermal carbon and coating liquid are mixed according to the feeding ratio of 2:1:4:1, and after stirring and dispersing, drying is carried out to obtain a composite biological agent.

[0083] S5, the bottom mud, titanium gypsum, composite biological agent and amino acid are mixed uniformly according to the feeding ratio of 3:7:3:1 to obtain a saline-alkali soil improver.

[0084] Example 4

[0085] S1, the alkali-resistant bacillus, bacillus licheniformis, bacillus mucilaginosus, nitrogen-fixing bacteria, trichoderma, salt-tolerant actinomycetes and lactic acid bacteria are respectively placed in the culture medium for cultivation to obtain each type of bacterial agent with effective viable cell number greater than 100 million per milliliter, and the bacterial agents are mixed to obtain a composite microbial agent.

[0086] S2, the sodium carboxymethyl cellulose is dissolved in distilled water, nitrogen is introduced to exhaust air, heating is carried out to 70 DEG C, potassium persulfate is added, and stirring is carried out for 20 min; gamma-aminobutyric acid and magnesium sulfate are sequentially added, and stirring and heating are carried out at 70 DEG C for 2 h; cooling is carried out to 20 DEG C, and standing is carried out for 60 min to obtain a modified sodium carboxymethyl cellulose solution.

[0087] S3, the modified sodium carboxymethyl cellulose solution, sodium alginate and chitosan are mixed according to the feeding ratio of 4:1:1, the mixed solution is heated to 60 DEG C and stirred for 15 min. After all the ingredients are completely dissolved, 3% glycerol and 3% calcium chloride solution are added respectively.

[0088] S4, the composite microbial agent, glucose solution, hydrothermal carbon and coating liquid are mixed according to the feeding ratio of 2:1:4:1, and after stirring and dispersing, drying is carried out to obtain a composite biological agent.

[0089] S5, the bottom mud, titanium gypsum, composite biological agent and amino acid are mixed uniformly according to the feeding ratio of 3:7:3:1 to obtain a saline-alkali soil improver.

[0090] Example 5

[0091] S1, the alkali-resistant bacillus, bacillus licheniformis, bacillus mucilaginosus, nitrogen-fixing bacteria, trichoderma, salt-tolerant actinomycetes and lactic acid bacteria are respectively placed in the culture medium for cultivation to obtain each type of bacterial agent with effective viable cell number greater than 100 million per milliliter, and the bacterial agents are mixed to obtain a composite microbial agent.

[0092] S2, dissolve sodium carboxymethyl cellulose in distilled water, pass nitrogen to exhaust air, heat to 70°C, add potassium persulfate, stir for 20 min; add g-aminobutyric acid and magnesium sulfate in turn, stir and heat at 70°C for 2h; cool to 20°C, stand for 60 min, to obtain modified sodium carboxymethyl cellulose solution.

[0093] S3, mix modified sodium carboxymethyl cellulose solution, sodium alginate and chitosan according to the feeding ratio of 3:1:1, heat the mixed solution to 60°C and stir for 15 min. After all components are completely dissolved, add 3% glycerol and 3% calcium chloride solution respectively.

[0094] S4, mix the composite microbial agent, glucose solution, hydrothermal carbon and coating liquid according to the feeding ratio of 2:1:4:1, stir and disperse, then dry to obtain a composite biological agent.

[0095] S5, mix the bottom mud, titanium gypsum, composite biological agent and amino acid according to the feeding ratio of 3:7:3:1, to obtain a saline-alkali soil improver.

[0096] Example 6

[0097] S1, culture Bacillus alcaliphilus, Bacillus licheniformis, Bacillus mucilaginosus, nitrogen-fixing bacteria, Trichoderma, salt-tolerant actinomycetes and lactic acid bacteria in culture medium respectively, to obtain each type of bacterial agent with more than 100 million effective viable bacteria per milliliter, mix the bacterial agents to obtain a composite microbial agent.

[0098] S2, dissolve sodium carboxymethyl cellulose in distilled water, pass nitrogen to exhaust air, heat to 70°C, add potassium persulfate, stir for 20 min; add g-aminobutyric acid and magnesium sulfate in turn, stir and heat at 70°C for 2h; cool to 20°C, stand for 60 min, to obtain modified sodium carboxymethyl cellulose solution.

[0099] S3, mix modified sodium carboxymethyl cellulose solution, sodium alginate and chitosan according to the feeding ratio of 4:1:1, heat the mixed solution to 60°C and stir for 15 min. After all components are completely dissolved, add 3% glycerol and 3% calcium chloride solution respectively.

[0100] S4, mix the composite microbial agent, glucose solution, hydrothermal carbon and coating liquid according to the feeding ratio of 2:1:4:1, stir and disperse, then dry to obtain a composite biological agent.

[0101] S5, mix the bottom mud, titanium gypsum, composite biological agent, amino acid, phosphorite powder and ferrous sulfate according to the feeding ratio of 4:7:3:1:0.5:0.5, to obtain a saline-alkali soil improver.

[0102] Example 7

[0103] S1, Bacillus alkaliphilus, Bacillus licheniformis, Bacillus mucilaginosus, nitrogen-fixing bacteria, Trichoderma, salt-tolerant actinomycetes and lactic acid bacteria were respectively placed in culture medium for culture, to obtain each type of microbial inoculant with effective viable cell number greater than 100 million per milliliter, and the various types of microbial inoculants were mixed to obtain a composite microbial inoculant.

[0104] S2, carboxymethyl cellulose sodium was dissolved in distilled water, nitrogen was introduced to remove air, heated to 70℃, added potassium persulfate, stirred for 20 min; γ-aminobutyric acid and magnesium sulfate were added in turn, and stirred and heated at 70℃ for 2h; cooled to 20℃, and stood for 60 min to obtain a modified carboxymethyl cellulose sodium solution.

[0105] S3, the modified carboxymethyl cellulose sodium solution, sodium alginate and chitosan were mixed in a ratio of 4:1:1, the mixed solution was heated to 60℃ and stirred for 15 min. After all the ingredients were completely dissolved, 3% glycerol and 3% calcium chloride solution were added respectively.

[0106] S4, the composite microbial inoculant, glucose solution, hydrothermal carbon and coating liquid were mixed in a ratio of 2:1:4:1, stirred and dispersed, and then dried to obtain a composite biological agent.

[0107] S5, the bottom mud, titanium gypsum, composite biological agent, amino acid, phosphate rock powder and ferrous sulfate were mixed uniformly in a ratio of 4:7:3:1:1:1 to obtain a saline-alkali soil improver.

[0108] Example 8

[0109] S1, Bacillus alkaliphilus, Bacillus licheniformis, Bacillus mucilaginosus, nitrogen-fixing bacteria, Trichoderma, salt-tolerant actinomycetes and lactic acid bacteria were respectively placed in culture medium for culture, to obtain each type of microbial inoculant with effective viable cell number greater than 100 million per milliliter, and the various types of microbial inoculants were mixed to obtain a composite microbial inoculant.

[0110] S2, carboxymethyl cellulose sodium was dissolved in distilled water, nitrogen was introduced to remove air, heated to 70℃, added potassium persulfate, stirred for 20 min; γ-aminobutyric acid and magnesium sulfate were added in turn, and stirred and heated at 70℃ for 2h; cooled to 20℃, and stood for 60 min to obtain a modified carboxymethyl cellulose sodium solution.

[0111] S3, the modified carboxymethyl cellulose sodium solution, sodium alginate and chitosan were mixed in a ratio of 4:1:1, the mixed solution was heated to 60℃ and stirred for 15 min. After all the ingredients were completely dissolved, 3% glycerol and 3% calcium chloride solution were added respectively.

[0112] S4, the composite microbial inoculant, glucose solution, hydrothermal carbon and coating liquid are mixed in a feeding ratio of 2:1:4:1, stirred and dispersed, and then dried to obtain a composite biological agent.

[0113] S5, the bottom mud, titanium gypsum, composite biological agent, amino acid, phosphate rock powder and ferrous sulfate are mixed in a feeding ratio of 4:7:3:1:1.5:1.5 to obtain a saline-alkali soil improver.

[0114] Example 9

[0115] S1, the alkali-resistant Bacillus, Bacillus licheniformis, Bacillus mucilaginosus, nitrogen-fixing bacteria, Trichoderma, salt-tolerant actinomycetes and lactic acid bacteria are respectively placed in the culture medium for cultivation, and each type of bacterial agent with more than 100 million effective viable bacteria per milliliter is obtained. The composite microbial inoculant is obtained by mixing the bacterial agents.

[0116] S2, the sodium carboxymethyl cellulose is dissolved in distilled water, nitrogen is introduced to remove air, heated to 70℃, potassium persulfate is added, and stirred for 20 min; γ-aminobutyric acid and magnesium sulfate are added in turn, and stirred and heated at 70℃ for 2h; cooled to 20℃, and stand for 60 min to obtain a modified sodium carboxymethyl cellulose solution.

[0117] S3, the modified sodium carboxymethyl cellulose solution, sodium alginate and chitosan are mixed in a feeding ratio of 4:1:1, the mixed solution is heated to 60℃ and stirred for 15 min. After all the ingredients are completely dissolved, 3% glycerol and 3% calcium chloride solution are added respectively.

[0118] S4, the composite microbial inoculant, glucose solution, hydrothermal carbon and coating liquid are mixed in a feeding ratio of 2:1:4:1, stirred and dispersed, and then dried to obtain a composite biological agent.

[0119] S5, the bottom mud, titanium gypsum, composite biological agent, amino acid, phosphate rock powder and ferrous sulfate are mixed in a feeding ratio of 4:7:3:1:2:2 to obtain a saline-alkali soil improver.

[0120] Example 10

[0121] S1, the alkali-resistant Bacillus, Bacillus licheniformis, Bacillus mucilaginosus, nitrogen-fixing bacteria, Trichoderma, salt-tolerant actinomycetes and lactic acid bacteria are respectively placed in the culture medium for cultivation, and each type of bacterial agent with more than 100 million effective viable bacteria per milliliter is obtained. The composite microbial inoculant is obtained by mixing the bacterial agents.

[0122] S2, dissolve sodium carboxymethyl cellulose in distilled water, introduce nitrogen to exhaust air, heat to 70°C, add potassium persulfate, stir for 20 min; add γ-aminobutyric acid and magnesium sulfate in turn, stir and heat at 70°C for 2 h; cool to 20°C, stand for 60 min, to obtain a modified sodium carboxymethyl cellulose solution.

[0123] S3, mix the modified sodium carboxymethyl cellulose solution, sodium alginate and chitosan according to a feeding ratio of 4:1:1, heat the mixed solution to 60°C and stir for 15 min. After all the ingredients are completely dissolved, add 3% glycerol and 3% calcium chloride solution respectively.

[0124] S4, mix the composite microbial agent, glucose solution, boiler biochar and coating liquid according to a feeding ratio of 2:1:4:1, stir and disperse, then dry to obtain a composite biological agent.

[0125] S5, mix the bottom mud, titanium gypsum, composite biological agent, amino acid, phosphate rock powder and ferrous sulfate according to a feeding ratio of 4:7:3:1:1.5:1.5, to obtain a saline-alkali soil improver.

[0126] Experimental design

[0127] The test field is divided into 10 test fields, each with an area of 1 mu, and is recorded as test field 1 to 10 in turn. The saline-alkali soil improver used corresponds to the saline-alkali soil improver in Example 1 to Example 10. The experimental crop is corn, and a two-month improvement experiment is carried out, with tap water being used for regular irrigation. After the experiment, sampling analysis is carried out, and the results are shown in the following table:

[0128] Table 1 Growth of corn crops

[0129] Example Plant height / cm Plant stem thickness / cm Leaf number / piece 1 28.9 5.1 7.8 2 39.1 5.4 8.2 3 45.2 5.7 8.7 4 56.9 6.0 9.3 5 50.3 5.8 8.9 6 52.1 5.9 9.1 7 56.9 6.1 9.6 8 63.2 6.5 10.2 9 59.8 6.2 9.6 10 52.6 5.9 9.2

[0130] From the above experiments and experimental results, it can be concluded that:

[0131] (1) Example 1 and Example 2: The plant height, stem thickness and leaf number of the corn plants in Example 2 are significantly higher than those in Example 1, which is because the combination of the improver in Example 2 is more effective in promoting the growth of corn. Example 1 uses acid phosphorus gypsum as a saline-alkali soil improver, while Example 2 uses a mixture of composite microbial agent, glucose solution, hydrochar and bottom mud, titanium gypsum and amino acid as an improver. The composite microbial agent can improve the soil microbial environment and improve soil fertility, while the glucose solution and hydrochar provide carbon source and energy for the growth and activity of microorganisms, thereby further improving the soil structure and promoting the growth of crops.

[0132] (2) Example 2 and Examples 3 to 5: The corn growth in Examples (3, 4, 5) using the coating liquid is generally better than that in Example 2 without using the coating liquid. This is because the coating liquid composed of modified sodium carboxymethyl cellulose solution, sodium alginate and chitosan is not used in Example 2, but is used in Examples 3 to 5. The coating liquid can protect the microbial inoculant, improve its survival rate in adverse environmental conditions, and slowly release the microorganisms through the controlled release mechanism to enhance the bioactivity of the biochar and the soil improvement effect. In addition, the concentration of the coating liquid (i.e. the feeding ratio of each component) is different in Examples 3 to 5. If the concentration of the coating liquid is too high, a too tight wrapping layer is formed, which limits the contact of the microbial inoculant with the soil environment, thereby affecting its respiration and metabolic activity. If the concentration of the coating liquid is too low, the microbial inoculant is damaged by the external environment in the soil, resulting in inhibition of the growth of the microbial inoculant in the soil, so that it cannot fully play its role in improving the soil environment. Therefore, the corn growth in Example 4 is better than that in Examples 3 and 5.

[0133] (3) Example 4 and Examples 6 to 9: The corn growth in Examples (6, 7, 8, 9) with the addition of phosphate rock powder and iron fertilizer is generally better than that in Example 4 without the addition. This is because phosphate rock powder and iron fertilizer are not added in Example 4, but different amounts of phosphate rock powder and iron fertilizer are added in Examples 6 to 9. Phosphate rock powder as a source of phosphorus can improve the POD activity of corn; iron fertilizer can promote the antioxidant enzyme system of plants. Improving the POD and CAT activities of corn, which is specifically manifested by removing excess active oxygen free radicals in cells through improving the activities of POD and CAT, thereby protecting the cell membrane from oxidative damage, improving its growth vigor, and at the same time optimizing the metabolic pathway of corn and improving the energy utilization efficiency. In addition, the corn growth in Example 8 is better than that in Examples 6, 7 and 9, because the addition ratio of phosphate rock powder and iron fertilizer in the saline-alkali soil conditioner is different. If the amount of phosphate rock powder added is too high, the accumulation of phosphorus in the soil is too much, which competes with other nutrient elements (such as nitrogen, potassium, etc.), resulting in nutrient imbalance, affecting the absorption and utilization of other nutrient elements by corn, and further affecting the root growth and water absorption and transport. If the amount of phosphate rock powder added is too low, it cannot play the role of improving the soil physical and chemical properties of the conditioner. If the amount of iron fertilizer added is too high, it will cause soil acidification, affecting the activity of soil microorganisms and the stability of soil structure; if the amount of iron fertilizer added is too low, the antioxidant enzyme system is damaged, reducing the resistance of corn to salt stress.

[0134] (4) Examples 8 and 10: The corn growth in Example 8, which used hydrothermal charcoal, was significantly better than that in Example 10, which used boiler biochar. This is because hydrothermal charcoal has a better pore structure and adsorption performance, enabling it to more effectively adsorb and fix harmful substances in the soil while providing the carbon source and energy required by microorganisms. Although boiler biocharcoal also has certain adsorption performance, its structure and performance are inferior to those of hydrothermal charcoal. In addition, during the production of boiler biocharcoal, high temperatures lead to the loss of acidic functional groups and the formation of basic functional groups, resulting in a higher pH value for boiler biocharcoal compared to hydrothermal charcoal.

[0135] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A high-efficiency environmentally friendly saline-alkali soil improvement agent preparation device, characterized in that, It comprises a first mixing cylinder (1), a vacuum drying box (2) and a second mixing cylinder (3). The first mixing cylinder (1) comprises a first cylinder body (11), a first feeding port (12) arranged at the top of the first cylinder body (11), a first discharging port (13) arranged at the bottom of the first cylinder body (11), a first stirring assembly (14) arranged inside the first cylinder body (11) and a temperature control assembly (15) arranged inside the first cylinder body (11). The vacuum drying box (2) comprises a machine body (21), a vacuum chamber (22) arranged at the upper part of the machine body (21) and a vacuum pumping assembly (23) arranged at the lower part of the machine body (21). The second mixing cylinder (3) comprises a second cylinder body (31), a second feeding port (32) arranged at the top of the second cylinder body (31), a second discharging port (33) arranged at the bottom of the second cylinder body (31) and a second stirring assembly (34) arranged inside the second cylinder body (31).

2. The device for preparing a high-efficiency environmentally friendly saline and alkaline land modifier according to claim 1, characterized in that, The temperature control assembly (15) comprises a medium pipe (151) which is in spiral shape around the axis of the first mixing cylinder (1) and abuts against the inner wall of the first mixing cylinder (1); the first end and the last end of the medium pipe (151) extend outwardly through the inner wall of the first mixing cylinder (1) to form a medium inlet (152) and a medium outlet (153) respectively.

3. The device for preparing a high-efficiency environmentally friendly saline and alkaline land modifier according to claim 2, characterized in that, The first stirring assembly (14) comprises a stirring shaft (141) arranged inside the first mixing cylinder (1), a stirring paddle (142) arranged at the bottom of the stirring shaft (141), a positioning seat (143) arranged at the bottom inside the first mixing cylinder (1) and a first power unit (144) arranged at the top of the first mixing cylinder (1); the positioning seat (143) comprises a plurality of supports (1431) abutting against the inner wall of the first mixing cylinder (1) and a shaft seat (1432) fixed at the top of the supports (1431); the top end of the stirring shaft (141) is power-connected with the first power unit (144) and the bottom end is rotatably arranged in the center of the shaft seat (1432).

4. The device for preparing a high-efficiency environmentally friendly saline-alkali soil improver according to claim 1, characterized in that, The first mixing cylinder (1) is further provided with a jacket (16) with hollow inside, and the jacket (16) is provided with a liquid inlet (161) and a liquid outlet (162).

5. The device for preparing a high-efficiency environmentally friendly saline-alkali soil improver according to claim 3, characterized in that, The first mixing cylinder (1) is further provided with a ventilation assembly (17); the ventilation assembly (17) comprises a mounting support (171) fixed on the inner wall of the first mixing cylinder (1) and a ventilation pipe (172) fixed on the mounting support (171); one end of the ventilation pipe (172) is close to the bottom of the first mixing cylinder (1) and the other end extends outwardly from the top of the first mixing cylinder (1).

6. The device for preparing a high-efficiency environmentally friendly saline and alkaline land modifier according to claim 1, characterized in that, The bottom of the first mixing cylinder (1) is further provided with a sampling valve (18) for sampling.

7. The device for preparing a high-efficiency environmentally friendly saline and alkaline land modifier according to claim 1, characterized in that, The first mixing cylinder (1) is further provided with a window (19) for observing the inside of the cylinder.

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