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CN-121970666-A - Collard growth matrix based on construction waste and preparation method thereof

CN121970666ACN 121970666 ACN121970666 ACN 121970666ACN-121970666-A

Abstract

The invention discloses a collard growth matrix based on construction waste and a preparation method thereof, belonging to the technical field of fertilizer synergy, the invention is based on preliminary reduction of the salt alkalinity of waste concrete and waste brick particles in the matrix, the alkaline source in the matrix is continuously acidified by adopting gypsum powder, elemental sulfur and composite bacteria, and the residual salt is locked by adopting a nutrient slow-release film, so that the effect of quickly and permanently reducing the alkali and the salt of the construction waste particles is realized, and a slightly acidic and low-salt root system environment is provided for the growth of collard. The pH value of the collard growth matrix based on the construction waste provided by the invention is maintained at 6.2-6.7, the EC value is as low as 1.0 mS.cm ‑1 ~1.4mS·cm ‑1 , the ventilation pores are more than or equal to 18%, the water holding pores are more than or equal to 45%, the total nitrogen is 1.8 g.kg ‑1 ~2.2g·kg ‑1 , the available phosphorus is more than or equal to 35 mg.kg ‑1 , and the quick-acting potassium is more than or equal to 250 mg.kg ‑1 .

Inventors

  • Mi Meixia
  • QI YUXIA
  • YU RAN

Assignees

  • 山西农业大学

Dates

Publication Date
20260505
Application Date
20260205

Claims (10)

  1. 1. The preparation method of the collard growth matrix based on the construction waste is characterized by comprising the following steps of: Mixing and stacking wet particles and gypsum powder, spraying phosphoric acid, forming a Ca-Al-Si complex layer by Ca 2+ in the gypsum powder, aluminum hydroxyl and silicon oxygen anions on the surface of the wet particles, closing hydration sites, forming a CaHPO 4 ·2H 2 O film by formed Ca (OH) 2 and PO 3 2- , and preventing OH - from being released to obtain a premix matrix; Spraying elemental sulfur into the premix substrate, spraying a composite microbial inoculum of the sulfur-containing bacillus and the bacillus, performing aerobic fermentation at 35-40 ℃, converting Fe 2+ of ferrous oxide sulfur-containing bacillus in the sulfur-containing bacillus into Fe 3+ by the elemental sulfur, and hydrolyzing to generate Fe (OH) 3 colloid to obtain a micro-aggregate; The composite microbial inoculum consists of 35% of thiobacillus thiooxidans, 25% of thiobacillus ferrooxidans, 20% of bacillus subtilis, 10% of bacillus mucilaginosus and 10% of bacillus megaterium in percentage by mass, and the total viable count of the composite microbial inoculum is more than or equal to 1 multiplied by 10 9 CFU·mL -1 ; And (3) a water-retaining agent is used for forming a water gel layer on the surface of the micro-aggregate, then thoroughly decomposed cassava residue compost and nutrient solution are added, the stack film is covered, and the stack film is compounded with perlite to obtain the collard growth matrix based on construction waste.
  2. 2. The method for preparing the collard growth substrate based on the construction waste according to claim 1, wherein the mass concentration of the citric acid and the sulfuric acid is 0.3% -0.5%, the mass ratio of the base material to the citric acid is 1:1.5-2, and the mass ratio of the base material to the sulfuric acid is 1:1.5-2.
  3. 3. The method for preparing the collard growth substrate based on the construction waste according to claim 1, wherein the amount of the gypsum powder is 1 kg-m -3 ~2kg·m -3 , the mass concentration of the phosphoric acid is 2% -4%, and the amount of the phosphoric acid is 1 kg-m -3 ~2kg·m -3 based on the volume of the collard growth substrate based on the construction waste.
  4. 4. The method for preparing the collard growth substrate based on the construction waste according to claim 1, wherein the amount of the composite microbial agent is 0.8L-m -3 ~1.2L·m -3 and the amount of the elemental sulfur is 0.3 kg-m -3 ~0.6kg·m -3 based on the volume of the collard growth substrate based on the construction waste.
  5. 5. The method for preparing a collard growth substrate based on construction waste according to claim 1, wherein the nutrient solution is prepared by mixing monoammonium phosphate with a concentration of 20g/L, potassium sulfate with a concentration of 15g/L, calcium nitrate with a concentration of 10g/L, and magnesium sulfate with a concentration of 5 g/L.
  6. 6. The method for preparing a construction waste-based collard growth substrate according to claim 5, wherein the nutrient solution is used in an amount of 50L-m -3 ~60L·m -3 based on the volume of the construction waste-based collard growth substrate.
  7. 7. The method for preparing a construction waste-based collard growth substrate according to claim 1, wherein the water-retaining agent is used in an amount of 80 g.m -3 ~120g·m -3 based on the volume of the construction waste-based collard growth substrate.
  8. 8. The method for preparing the collard growth substrate based on the construction waste according to claim 1, wherein the mass ratio of the waste concrete is 18% -22%, the mass ratio of the waste brick particles is 13% -17%, the mass ratio of the decomposed cassava residue compost is 40% -50%, and the mass ratio of the perlite is 8% -12% based on the mass of the collard growth substrate based on the construction waste.
  9. 9. The collard growing matrix based on construction waste is characterized by being prepared by the preparation method of any one of claims 1-8.
  10. 10. The construction waste-based collard growth substrate according to claim 9, wherein the construction waste-based collard growth substrate has a pH of 6.2 to 6.7 and an ec of 1.0 mS-cm -1 ~1.4mS·cm -1 .

Description

Collard growth matrix based on construction waste and preparation method thereof Technical Field The invention relates to the technical field of plant growth matrixes, in particular to a collard growth matrix based on construction waste and a preparation method thereof. Background The collard (Brassica oleracea var. Acephala) is a biennial leaf plant of Brassica of Brassicaceae, and has a leaf color of purplish red, milky white or emerald green, and is in the shape of feathered, shrunken or rosette. Collard has good cold weather preference, strong cold resistance, and cold resistance of-10deg.C to-15deg.C, can endure short-time frost for many times, has bright leaf color after frost in winter, and can be used as flower bed, flower border, potted plant or fresh tender leaf. The planting soil of the collard is loose, fertile, water-retaining, fertilizer-retaining and breathable sandy soil, loam and light clay. Common cultivation substrates for collard include turf-dominant, tapioca-residue/scale-loosening-replacement, earthworms-type, and garden waste-type. The turf is mainly compounded by turf, vermiculite and perlite, has the advantages of large porosity and low EC, but belongs to non-renewable resources, so that the cost is high, the turf is excessively strong in water retention, and accurate water control is needed during cultivation. The cassava residue/loose scale substitute is prepared by compounding cassava residue (or loose scale), peat and perlite, so that the waste is recycled, the cost is reduced by 30% compared with that of pure turf, the organic content of the culture medium of the type is high, the crown width of the plant has the maximum number of color-changing leaves, the ornamental value is highest, the carbon-nitrogen ratio is high, additional nitrogen supplement is needed in early stage, and the cassava residue is thoroughly decomposed, and secondary fermentation in later stage leads to root burning. The earthworm soil is compounded by wormcast, peat and perlite, is rich in available nutrients and beneficial microorganisms, can achieve the same yield as pure garden soil, has good buffering property, but has unstable wormcast sources and easily exceeds standard heavy metals and salts. For garden waste, the garden waste residue, peat and perlite are compounded to realize recycling of the waste. Because of the huge yield and stock of construction waste, the traditional 98% of the construction waste is directly buried, occupies about 30 ten thousand mu/year of land, blocks the soil biological chain and forms a permanent environmental risk. The construction waste is converted into the matrix, and a large-scale digestion path can be provided for the stock and increment at the same time, so that the land for landfill and the clearing cost are remarkably saved. Traditional substrates rely on non-renewable turf, with costs continually rising and limited by exploitation. After the bricks, stones and concrete in the construction waste are crushed and graded, the construction waste can replace river sand or loam as an inorganic skeleton, has wide sources and almost zero cost, not only relieves the grass carbon dependence, but also reduces the matrix selling price by 20% -40%, and has economic attraction for projects such as roof greening, mine reclamation and the like. However, when bricks and concrete are used as components of the collard growth matrix, ca (OH) 2、CaSO4 in the waste concrete and the bricks dissolves out to cause the pH value of the matrix to reach 9-11, the EC value to reach 4 mS.cm -1~6mS·cm-1, and the pH value is far beyond the proper range of the collard (pH value is about 6.0-6.8, and the EC value is less than 1.5 mS.cm -1), so that the problem of dual high alkalinity and salinity of the growth matrix is caused. Disclosure of Invention The invention provides a collard growth matrix based on construction waste and a preparation method thereof, which effectively solve the technical problem that the existing construction waste is used as a matrix component and is unsuitable for collard growth due to double high saline and alkaline, and the invention provides a slightly acidic and low-salt root system environment for collard growth on the basis of preliminarily reducing the salt alkalinity of waste concrete and waste brick particles in the matrix, continuously acidizing an alkali source in the matrix by adopting gypsum powder, elemental sulfur and composite bacteria, and locking residual salt by adopting a nutrient slow-release film. The first object of the invention is to provide a method for preparing a collard growth substrate based on construction waste, comprising the following steps: and mixing and stacking the wet particles and gypsum powder, spraying phosphoric acid, forming a Ca-Al-Si complex layer by Ca 2+ in the gypsum powder, aluminum hydroxyl and silicon oxygen anions on the surface of the wet particles, closing hydration sites, forming a CaHPO 4·2H2 O film by formed Ca