Preparation method of efficient active organic-inorganic compound fertilizer containing biochar for synergism

Abstract

The invention relates to the technical field of sunscreen articles, in particular to a preparation method of a biochar-containing synergistic efficient active organic-inorganic compound fertilizer, which comprises the following steps: activating rice husk charcoal and straw charcoal, and loading materials such as nano titanium dioxide to modify biochar; the organic materials are subjected to composite microbial agent pre-fermentation and composite enzymatic hydrolysis treatment; the preparation method comprises the following steps: mixing the modified biochar with materials, adding a plurality of functional materials, extruding and granulating, and carrying out plasma treatment and double-layer coating after granulating, so as to prepare the compound fertilizer with excellent performance. Through biochar modification and multi-technology synergistic treatment, the microbial activity of the fertilizer is improved, the heavy metal adsorption and nutrient slow release capabilities are enhanced, the stress resistance and yield of crops are improved, pollution is reduced, and green and efficient production is realized.

Claims

1. A method for preparing a high-efficiency active organic-inorganic compound fertilizer containing biochar synergist, characterized in that: The following steps are involved: S1: Functional modification of biochar: rice husk charcoal and straw charcoal were mixed in a mass ratio of 2:1, activated at 450°C for 2.5 hours, cooled, mixed with 2.5% nano-titanium dioxide sol, and ultrasonically dispersed to form supported biochar. 0.8% propylene glycol alginate and 0.1% graphene quantum dots were then added for surface coating. S2: Organic material pretreatment: livestock and poultry manure and kitchen waste were mixed in a ratio of 4:1, the moisture content was adjusted to 62%, and a composite bacterial agent was added at a dosage of 0.4%. The mixture was pre-fermented at 37°C for 3.5 days, during which microwave treatment was performed every 6 hours; S3: Compound enzymatic hydrolysis treatment: 0.3% compound enzyme and 0.15% γ-polyglutamic acid were added to the pre-fermented material, 0.08 mg / L ozone was introduced, and enzymatic hydrolysis was carried out at 52°C for 7 hours; S4: Multiphase mixing: functionalized biochar was mixed with enzymatically hydrolyzed organic materials at a ratio of 1:6, inorganic nutrients were added, and then 0.08% of nano-selenium-amino acid chelate, 0.2% of polyaspartic acid, and 0.05% of temperature-responsive PNIPAM microspheres were added; S5: Extrusion granulation: the mixed material is passed through a twin-screw extruder and granulated at 65°C. The particle size is controlled at 4 mm. After granulation, low-temperature plasma treatment is performed; the low-temperature plasma treatment conditions are helium atmosphere, power 180 W, and treatment for 2.5 minutes.

2. The method for preparing a high-efficiency active organic-inorganic compound fertilizer containing biochar synergistics according to claim 1, characterized in that: It also includes the addition of 0.03% nano-zero-valent iron during the S1 biochar modification process, which is loaded by ultrasound-assisted in-situ reduction method.

3. The method for preparing a high-efficiency active organic-inorganic compound fertilizer containing biochar synergistics according to claim 1, characterized in that: The method also includes adding 0.2% magnetic biochar microspheres in the S2 pre-fermentation stage, wherein the magnetic biochar microspheres have a particle size of 100 μm and a saturation magnetization intensity of 25 emu / g, and regulating the microbial metabolic environment through an external magnetic field.

4. The method for preparing a high-efficiency active organic-inorganic compound fertilizer containing biochar synergistics according to claim 1, characterized in that: The S3 enzymatic hydrolysis process adopts variable temperature control, 52° C. for the first 3 hours and then drops to 45° C. for the next 4 hours, and 20 kHz ultrasonic waves with an ultrasonic power of 100 W are applied in an intermittent operation.

5. The method for preparing a high-efficiency active organic-inorganic compound fertilizer containing biochar synergistics according to claim 1, characterized in that: The nano-selenium-amino acid chelate in S4 was synthesized by microwave-assisted reaction at a temperature of 120° C. for 15 minutes. 4+ Form exists.

6. The method for preparing a high-efficiency active organic-inorganic compound fertilizer containing biochar synergistics according to claim 1, characterized in that: 0.1% of carbon nanotubes are added during the extrusion granulation of the S5, and the length of the carbon nanotubes is 5-10 μm.

7. The method for preparing a high-efficiency active organic-inorganic compound fertilizer containing biochar synergistics according to claim 1, characterized in that: The invention also includes a double-layer coating treatment after granulation, wherein the inner layer is a sodium alginate-chitosan composite with a thickness of 0.06 mm, and the outer layer is a polyvinyl alcohol-silicon dioxide coating with a thickness of 0.04 mm.

8. The method for preparing a high-efficiency active organic-inorganic compound fertilizer containing biochar synergistics according to claim 1, characterized in that: The composite bacterial agent is Bacillus subtilis: Bacillus licheniformis: Saccharomyces cerevisiae = 3:2:1; the composite enzyme is cellulase: protease: lipase = 5:3:2; and the inorganic nutrient is N:P2O5:K2O = 2:1:

1.

9. The method for preparing a high-efficiency active organic-inorganic compound fertilizer containing biochar synergistics according to claim 1, characterized in that: The temperature-responsive PNIPAM microspheres in S4 have an LCST of 32° C., a particle size of 50 μm, and are prepared by emulsion polymerization.

10. The method for preparing a high-efficiency active organic-inorganic compound fertilizer containing biochar synergistics according to claim 1, characterized in that: The process also includes plasma activation treatment of the finished product, wherein the plasma activation treatment conditions are an argon atmosphere, a power of 250W, and a treatment time of 4 minutes.

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