CN110950709A - Conditioner for repairing heavy metal soil and preparation method thereof - Google Patents
Conditioner for repairing heavy metal soil and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a conditioner for repairing heavy metal soil, which belongs to the technical field of soil conditioners and comprises the following components in percentage by weight: 30-35% of granular clay mineral, 20-25% of powdery livestock and poultry manure, 15-25% of calcium magnesium phosphate fertilizer, 10-20% of granular zeolite, 15-20% of straw powder and 1-3% of brevibacillus laterosporus powder, by combining the heavy metal inorganic passivator, the heavy metal organic passivator and the microorganism together to repair the heavy metal soil, on one hand, the organic passivators of the livestock manure and the straws can buffer the change of pH caused by the chemical passivator, on the other hand, the livestock manure and the straws can be combined with clay minerals, zeolite and calcium magnesium phosphate fertilizer to form a compound, thereby playing a role in preventing organic matters from being rapidly degraded to a certain extent, achieving the synergistic and complementary effects, the conditioner for heavy metal soil has the advantages of quick restoration effect on heavy metal soil, small ecological damage degree on soil and simple implementation.
Description
Technical Field
The invention relates to the technical field of soil conditioners, in particular to a conditioner for repairing heavy metal soil and a preparation method thereof.
Background
The inorganic pollutants in the soil are relatively prominent in heavy metals, and the heavy metals are easy to accumulate because the heavy metals cannot be decomposed by soil microorganisms and are converted into methyl compounds with higher toxicity, and even some methyl compounds are accumulated in a human body at harmful concentration through a food chain, so that the human health is seriously harmed. The heavy metal pollutants in soil mainly include mercury, cadmium, lead, copper, chromium, arsenic, nickel, iron, manganese, zinc, etc., although arsenic is not a heavy metal, it is usually discussed as being classified as a heavy metal because its behavior, source and harm are similar to those of heavy metals. As far as the needs for plants are concerned, the metallic elements can be classified into 2 types: the plant growth and development does not need elements, and the harm to the human health is obvious, such as cadmium, mercury, lead and the like. The plant growth and development needs elements, and has certain physiological functions to human body, such as copper, zinc, etc., but too much will cause pollution and hinder the growth and development of the plant. Since the same kind of metals have different forms in soil, and have different migration transformation characteristics and pollution properties, when researching the hazard of heavy metals in soil, attention must be paid not only to the total content of the metals, but also to the content of various forms.
The soil conditioner has the remediation principle of changing the physical and chemical properties and the micro-ecological environment of soil, and changes the existing state of heavy metals in the soil through the adsorption, precipitation or coprecipitation action of the heavy metals, thereby reducing the biological effectiveness and the mobility of the heavy metals. The treatment method of the polluted soil generally comprises biological repair, chemical repair, engineering measures and the like. The engineering treatment measures are often limited due to large engineering quantity, high cost and possible damage to the ecological functions of the soil; bioremediation has the advantages of simple implementation, no pollution and the like, but most soil conditioners have uneven quality and slow remediation effect at the present stage.
Based on the above, the invention designs a conditioner for repairing heavy metal soil and a preparation method thereof, so as to solve the problems.
Disclosure of Invention
The invention aims to provide a conditioner for repairing heavy metal soil and a preparation method thereof, aiming at solving the problems that the traditional engineering treatment measures proposed in the background technology are limited due to large engineering quantity and high cost and possible damage to the ecological function of the soil; the bioremediation has the advantages of simple implementation, no pollution and the like, but the problems of uneven quality and slow remediation effect of most soil conditioners at the present stage are solved.
In order to achieve the purpose, the invention provides the following technical scheme: a conditioner for repairing heavy metal soil comprises the following components in percentage by weight: 30-35% of granular clay mineral, 20-25% of powdery livestock and poultry manure, 15-25% of calcium magnesium phosphate fertilizer, 10-20% of granular zeolite, 15-20% of straw powder and 1-3% of brevibacillus laterosporus powder.
Preferably, the livestock manure is one or more of cattle, sheep, pig, chicken, goose and duck manure.
Preferably, the clay mineral is one of montmorillonite, vermiculite and sepiolite.
The invention also provides a preparation method of the conditioner for repairing heavy metal soil, which comprises the following steps:
step (1): drying, crushing and screening the livestock manure to prepare powdery manure;
step (2): respectively crushing and screening the clay minerals and the zeolite to obtain granular clay minerals and granular zeolite;
and (3): preparing a brevibacillus laterosporus microbial inoculum: inoculating the Brevibacillus laterosporus seed solution into a liquid fermentation culture medium according to the volume ratio of 2%, culturing for 48-72h under the conditions of 30 ℃ and the rotating speed of 150rpm, and preparing a Brevibacillus laterosporus microbial inoculum after 95% of bacteria in the fermentation solution form spores;
and (4): carrying out spray drying on the Brevibacillus laterosporus microbial inoculum prepared in the step (3) to prepare Brevibacillus laterosporus powder;
and (5): crushing and screening straws to obtain straw powder, adding the brevibacillus laterosporus powder into the straw powder, stirring and mixing uniformly, and placing the mixture in a cool place for air drying;
and (6): and (3) putting the calcium magnesium phosphate fertilizer, the powdery excrement in the step (1), the granular clay mineral in the step (2), the granular zeolite in the step (2) and the straw powder with the brevibacillus laterosporus in the step (5) into a mixer, and uniformly stirring to prepare the conditioner.
Preferably, the liquid fermentation medium in the step (3) comprises the following components in percentage by mass: 1.0% of bean cake powder, 2.0% of yeast powder, 1.0% of shrimp meal, 0.05% of sodium chloride and the balance of water, wherein the pH value is 7.0.
Preferably, a 60-140 mesh screen is adopted in the screening of the step (1), the step (2) and the step (5).
Preferably, the air inlet temperature of the spray drying in the step (4) is 150-200 ℃, and the air outlet temperature is 80-100 ℃.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the clay mineral, the zeolite and the calcium magnesium phosphate fertilizer are added to passivate heavy metal in soil, the clay mineral can adsorb some heavy metal cations on the surface of the clay mineral, and part of heavy metal ions are fixed in crystal lattices of the clay mineral; the zeolite has good thermal stability and acid resistance, and a plurality of cavities and pore canals are arranged in the zeolite, so that heavy metal ions can be adsorbed; by adding the calcium magnesium phosphate fertilizer, the pH value of the soil is increased, the negative charge on the surface of the soil is increased, the affinity of the soil to heavy metals is increased, and the MOH in the soil is increased+Increasing, further enabling heavy metals such as Cd, Cu, Hg, Zn and the like to form hydroxide or combined-state precipitation or coprecipitation, accelerating the decomposition of organic matters, fixing the heavy metals in soil, reducing the migration capacity of the heavy metals in the soil and soil plants, converting the heavy metals into insoluble compounds, reducing the absorption of crops and lightening the toxicity of the heavy metals in the soil;
by adding the livestock excrement and the Brevibacillus laterosporus microbial inoculum, the livestock excrement plays roles of complexing, intercepting and fixing heavy metal pollutants in the repair of soil heavy metal, and is beneficial to restoring a soil micro-ecological environment system; the brevibacillus laterosporus adsorbs heavy metals through extracellular adsorption and intracellular accumulation, and can secrete high molecular polymers (such as protein, polysaccharide, nucleic acid and the like) to adsorb the heavy metals;
the conditioner for heavy metal soil repairs the heavy metal soil by combining a heavy metal inorganic passivator, a heavy metal organic passivator and microorganisms, so that on one hand, the organic passivators such as livestock manure and straws can buffer the change of pH caused by a chemical passivator; on the other hand, the livestock excrement and the straws can be combined with the clay minerals, the zeolite and the calcium magnesium phosphate fertilizer to form a compound, so that the effect of preventing organic matters from being rapidly degraded is achieved to a certain extent, the synergistic and complementary effects are achieved, the conditioner for the heavy metal soil has a quick repairing effect on the heavy metal soil, the ecological damage degree on the soil is small, and the implementation is simple.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
a conditioner for repairing heavy metal soil comprises the following components in percentage by weight: 30% of granular montmorillonite, 20% of powdery cow dung, 20% of calcium magnesium phosphate fertilizer, 11% of granular zeolite, 18% of straw powder and 1% of brevibacillus laterosporus powder.
The preparation method of the conditioner for repairing heavy metal soil comprises the following steps:
step (1): drying, crushing and screening the cow dung, wherein a 100-mesh screen is adopted as a screen to prepare powdery dung;
step (2): respectively crushing and screening the montmorillonite and the zeolite, wherein a 100-mesh screen is adopted as the screen to obtain granular montmorillonite and granular zeolite;
and (3): preparing a brevibacillus laterosporus microbial inoculum: inoculating the Brevibacillus laterosporus seed solution into a liquid fermentation culture medium according to the volume ratio of 2%, culturing for 48h under the conditions of 30 ℃ and the rotating speed of 150rpm, and preparing the Brevibacillus laterosporus microbial inoculum after 95% of bacteria in the fermentation solution form spores, wherein the liquid fermentation culture medium comprises the following components in percentage by mass: 1.0% of bean cake powder, 2.0% of yeast powder, 1.0% of shrimp meal, 0.05% of sodium chloride and the balance of water, wherein the pH value is 7.0;
and (4): carrying out spray drying on the Brevibacillus laterosporus microbial inoculum prepared in the step (3), wherein the air inlet temperature of the spray drying is 150 ℃, the air outlet temperature is 80 ℃, and preparing into Brevibacillus laterosporus powder;
and (5): crushing and screening straws, wherein a 100-mesh screen is adopted as the screen to obtain straw powder, then adding the brevibacillus laterosporus powder into the straw powder, stirring and mixing uniformly, and placing the mixture in a shade place for air drying;
and (6): and (3) putting the calcium magnesium phosphate fertilizer, the powdery excrement in the step (1), the granular montmorillonite in the step (2), the granular zeolite in the step (2) and the straw powder with the brevibacillus laterosporus in the step (5) into a mixer, and uniformly stirring to prepare the conditioner 1.
Example 2:
a conditioner for repairing heavy metal soil comprises the following components in percentage by weight: 35% of granular vermiculite, 20% of powdery sheep manure, 15% of calcium magnesium phosphate fertilizer, 12% of granular zeolite, 16% of straw powder and 2% of brevibacillus laterosporus powder.
The preparation method of the conditioner for repairing heavy metal soil comprises the following steps:
step (1): drying, crushing and screening sheep manure, wherein a screen adopts a 110-mesh screen to prepare powdery manure;
step (2): respectively crushing and screening the vermiculite and the zeolite, wherein a sieve adopts a 110-mesh sieve to obtain granular vermiculite and granular zeolite;
and (3): preparing a brevibacillus laterosporus microbial inoculum: inoculating the Brevibacillus laterosporus seed solution into a liquid fermentation culture medium according to the volume ratio of 2%, culturing for 52h under the conditions of 30 ℃ and the rotating speed of 150rpm, and preparing the Brevibacillus laterosporus microbial inoculum after 95% of bacteria in the fermentation solution form spores, wherein the liquid fermentation culture medium comprises the following components in percentage by mass: 1.0% of bean cake powder, 2.0% of yeast powder, 1.0% of shrimp meal, 0.05% of sodium chloride and the balance of water, wherein the pH value is 7.0;
and (4): carrying out spray drying on the Brevibacillus laterosporus microbial inoculum prepared in the step (3), wherein the air inlet temperature of the spray drying is 160 ℃, and the air outlet temperature of the spray drying is 90 ℃, so as to prepare Brevibacillus laterosporus powder;
and (5): crushing and screening straws, wherein a screen with a 110-mesh screen is adopted to obtain straw powder, adding the brevibacillus laterosporus powder into the straw powder, stirring and mixing uniformly, and placing the mixture in a shade place for air drying;
and (6): and (3) putting the calcium magnesium phosphate fertilizer, the powdery excrement in the step (1), the granular vermiculite in the step (2), the granular zeolite in the step (2) and the straw powder with the brevibacillus laterosporus in the step (5) into a mixer, and uniformly stirring to prepare the conditioner 2.
Example 3:
a conditioner for repairing heavy metal soil comprises the following components in percentage by weight: 32% of granular sepiolite, 23% of powdered pig manure, 15% of calcium magnesium phosphate fertilizer, 10% of granular zeolite, 17% of straw powder and 3% of brevibacillus laterosporus powder.
The preparation method of the conditioner for repairing heavy metal soil comprises the following steps:
step (1): drying, crushing and screening the pig manure with a 120-mesh screen to obtain powdery manure;
step (2): respectively crushing and screening the sepiolite and the zeolite, wherein a 120-mesh screen is adopted as the screen to obtain granular sepiolite and granular zeolite;
and (3): preparing a brevibacillus laterosporus microbial inoculum: inoculating the Brevibacillus laterosporus seed solution into a liquid fermentation culture medium according to the volume ratio of 2%, culturing for 56h under the conditions of 30 ℃ and the rotating speed of 150rpm, and preparing the Brevibacillus laterosporus microbial inoculum after 95% of thalli in the fermentation solution form spores, wherein the liquid fermentation culture medium comprises the following components in percentage by mass: 1.0% of bean cake powder, 2.0% of yeast powder, 1.0% of shrimp meal, 0.05% of sodium chloride and the balance of water, wherein the pH value is 7.0;
and (4): carrying out spray drying on the brevibacillus laterosporus microbial inoculum prepared in the step (3), wherein the air inlet temperature of the spray drying is 170 ℃, and the air outlet temperature of the spray drying is 100 ℃, so as to prepare brevibacillus laterosporus powder;
and (5): crushing and screening straws, wherein a 120-mesh screen is adopted as the screen to obtain straw powder, then adding the brevibacillus laterosporus powder into the straw powder, stirring and mixing uniformly, and placing the mixture in a shade place for air drying;
and (6): and (3) putting the calcium magnesium phosphate fertilizer, the powdery excrement in the step (1), the granular sepiolite in the step (2), the granular zeolite in the step (2) and the straw powder with the brevibacillus laterosporus in the step (5) into a mixer, and uniformly stirring to prepare the conditioner 3.
Example 4:
a conditioner for repairing heavy metal soil comprises the following components in percentage by weight: 34% of granular montmorillonite, 21% of powdery chicken manure, 20% of calcium magnesium phosphate fertilizer, 12% of granular zeolite, 16% of straw powder and 2% of Brevibacillus laterosporus powder.
The preparation method of the conditioner for repairing heavy metal soil comprises the following steps:
step (1): drying, crushing and screening the chicken manure, wherein a 130-mesh screen is adopted as a screen to prepare powdery manure;
step (2): respectively crushing and screening the montmorillonite and the zeolite, wherein a 130-mesh screen is adopted as the screen to obtain granular montmorillonite and granular zeolite;
and (3): preparing a brevibacillus laterosporus microbial inoculum: inoculating the Brevibacillus laterosporus seed solution into a liquid fermentation culture medium according to the volume ratio of 2%, culturing for 60h under the conditions of 30 ℃ and the rotating speed of 150rpm, and preparing the Brevibacillus laterosporus microbial inoculum after 95% of bacteria in the fermentation solution form spores, wherein the liquid fermentation culture medium comprises the following components in percentage by mass: 1.0% of bean cake powder, 2.0% of yeast powder, 1.0% of shrimp meal, 0.05% of sodium chloride and the balance of water, wherein the pH value is 7.0;
and (4): carrying out spray drying on the Brevibacillus laterosporus microbial inoculum prepared in the step (3), wherein the air inlet temperature of the spray drying is 180 ℃, and the air outlet temperature of the spray drying is 90 ℃, so as to prepare Brevibacillus laterosporus powder;
and (5): crushing and screening straws, wherein a 130-mesh screen is adopted as the screen to obtain straw powder, then adding the brevibacillus laterosporus powder into the straw powder, stirring and mixing uniformly, and placing the mixture in a shade place for air drying;
and (6): and (3) putting the calcium magnesium phosphate fertilizer, the powdery excrement in the step (1), the granular montmorillonite in the step (2), the granular zeolite in the step (2) and the straw powder with the brevibacillus laterosporus in the step (5) into a mixer, and uniformly stirring to prepare the conditioner 4.
Example 5:
a conditioner for repairing heavy metal soil comprises the following components in percentage by weight: 31% of granular vermiculite, 21% of powdery goose manure, 17% of calcium magnesium phosphate fertilizer, 13% of granular zeolite, 15% of straw powder and 3% of brevibacillus laterosporus powder.
The preparation method of the conditioner for repairing heavy metal soil comprises the following steps:
step (1): drying, crushing and screening goose excrements, wherein a 90-mesh screen is adopted as a screen to prepare powdery excrements;
step (2): respectively crushing and screening the vermiculite and the zeolite, wherein a 90-mesh screen is adopted as a screen to obtain granular vermiculite and granular zeolite;
and (3): preparing a brevibacillus laterosporus microbial inoculum: inoculating the Brevibacillus laterosporus seed solution into a liquid fermentation culture medium according to the volume ratio of 2%, culturing for 64h under the conditions of 30 ℃ and the rotating speed of 150rpm, and preparing the Brevibacillus laterosporus microbial inoculum after 95% of bacteria in the fermentation solution form spores, wherein the liquid fermentation culture medium comprises the following components in percentage by mass: 1.0% of bean cake powder, 2.0% of yeast powder, 1.0% of shrimp meal, 0.05% of sodium chloride and the balance of water, wherein the pH value is 7.0;
and (4): carrying out spray drying on the Brevibacillus laterosporus microbial inoculum prepared in the step (3), wherein the air inlet temperature of the spray drying is 190 ℃, the air outlet temperature is 80 ℃, and preparing into Brevibacillus laterosporus powder;
and (5): crushing and screening straws, wherein a 90-mesh screen is adopted as a screen to obtain straw powder, adding the brevibacillus laterosporus powder into the straw powder, stirring and uniformly mixing, and placing the mixture in a shade place for air drying;
and (6): and (3) putting the calcium magnesium phosphate fertilizer, the powdery excrement in the step (1), the granular vermiculite in the step (2), the granular zeolite in the step (2) and the straw powder with the brevibacillus laterosporus in the step (5) into a mixer, and uniformly stirring to prepare the conditioner 5.
Example 6:
a conditioner for repairing heavy metal soil comprises the following components in percentage by weight: 31% of granular sepiolite, 24% of powdery duck manure, 15% of calcium magnesium phosphate fertilizer, 12% of granular zeolite, 15% of straw powder and 3% of brevibacillus laterosporus powder.
The preparation method of the conditioner for repairing heavy metal soil comprises the following steps:
step (1): drying, crushing and screening duck manure, wherein a 80-mesh screen is adopted as a screen to prepare powdery manure;
step (2): respectively crushing and screening the sepiolite and the zeolite, wherein a sieve mesh adopts a 80-mesh sieve to obtain granular sepiolite and granular zeolite;
and (3): preparing a brevibacillus laterosporus microbial inoculum: inoculating the Brevibacillus laterosporus seed solution into a liquid fermentation culture medium according to the volume ratio of 2%, culturing for 68h under the conditions of 30 ℃ and the rotating speed of 150rpm, and preparing the Brevibacillus laterosporus microbial inoculum after 95% of bacteria in the fermentation solution form spores, wherein the liquid fermentation culture medium comprises the following components in percentage by mass: 1.0% of bean cake powder, 2.0% of yeast powder, 1.0% of shrimp meal, 0.05% of sodium chloride and the balance of water, wherein the pH value is 7.0;
and (4): carrying out spray drying on the brevibacillus laterosporus microbial inoculum prepared in the step (3), wherein the air inlet temperature of the spray drying is 190 ℃, the air outlet temperature is 100 ℃, and preparing brevibacillus laterosporus powder;
and (5): crushing and screening straws, wherein a screen with 80 meshes is adopted to obtain straw powder, adding the brevibacillus laterosporus powder into the straw powder, stirring and uniformly mixing, and placing in a shade for air drying;
and (6): and (3) putting the calcium magnesium phosphate fertilizer, the powdery excrement in the step (1), the granular sepiolite in the step (2), the granular zeolite in the step (2) and the straw powder with the brevibacillus laterosporus in the step (5) into a mixer, and uniformly stirring to prepare the conditioner 6.
The experimental method of the conditioner comprises the following steps:
the experimental site is a paddy field in Fengyang county in Chuzhou city, Anhui province, one paddy field is selected as an experimental field, the experimental field is ploughed, raked, leveled into 7 cells, an isolation row is arranged between every two cells, one group of the experimental fields is a blank experimental region (no conditioner is added), the other six groups of the experimental fields are conditioner experimental regions and are provided with corresponding labels, the conditioners in the 6 embodiments (80 kg per mu) are sequentially and uniformly scattered in the corresponding experimental regions, raking is performed uniformly, and base fertilizer is applied after 2-3 times, and the rice is transplanted.
Data acquisition: detecting the heavy metals and pH of 7 subareas before adding the conditioner, and taking the average value of the heavy metal values of 7 subareas as an initial value; heavy metals and pH were measured in 7 partitions 15 days after the conditioner was added.
Table 1 shows the determination of the heavy metal content in the soil of different test areas in the test field
| Cr(mg/kg) | Pb(mg/kg) | pH | |
| Initial value | 0.52 | 32.46 | 5.42 |
| Ck (blank) | 0.49 | 30.51 | 5.37 |
| Conditioning agent 1 | 0.15 | 8.53 | 6.35 |
| Conditioning agent 2 | 0.12 | 8.25 | 6.13 |
| Conditioning agent 3 | 0.18 | 8.64 | 6.24 |
| Conditioning agent 4 | 0.14 | 8.32 | 6.38 |
| Conditioning agent 5 | 0.13 | 8.29 | 6.47 |
| Conditioning agent 6 | 0.10 | 7.76 | 6.56 |
From the above table, it can be seen that: compared with a blank test area, the content of cadmium and lead in the soil of the test area added with the heavy metal conditioner is obviously reduced to be within 0.2mg/kg specified by national standard, and the pH value of the soil of the test area is improved.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Rather, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. A conditioner for repairing heavy metal soil is characterized in that: comprises the following components in percentage by weight: 30-35% of granular clay mineral, 20-25% of powdery livestock and poultry manure, 15-25% of calcium magnesium phosphate fertilizer, 10-20% of granular zeolite, 15-20% of straw powder and 1-3% of brevibacillus laterosporus powder.
2. The conditioner for remediating heavy metal soil as claimed in claim 1, wherein: the livestock excrement is one or more of cow excrement, sheep excrement, pig excrement, chicken excrement, goose excrement and duck excrement.
3. The conditioner for remediating heavy metal soil as claimed in claim 1, wherein: the clay mineral is one of montmorillonite, vermiculite and sepiolite.
4. A method for preparing the conditioner for remediating heavy metal soil as claimed in claim 1, wherein the conditioner comprises the following steps: the method comprises the following steps:
step (1): drying, crushing and screening the livestock manure to prepare powdery manure;
step (2): respectively crushing and screening the clay minerals and the zeolite to obtain granular clay minerals and granular zeolite;
and (3): preparing a brevibacillus laterosporus microbial inoculum: inoculating the Brevibacillus laterosporus seed liquid into a liquid fermentation culture medium according to the volume ratio of 2%, culturing for 48-72h under the conditions of 30 ℃ and the rotating speed of 150rpm, and preparing a Brevibacillus laterosporus microbial inoculum after 95% of thalli in the fermentation liquid form spores;
and (4): carrying out spray drying on the Brevibacillus laterosporus microbial inoculum prepared in the step (3) to prepare Brevibacillus laterosporus powder;
and (5): crushing and screening straws to obtain straw powder, adding the brevibacillus laterosporus powder into the straw powder, stirring and mixing uniformly, and placing the mixture in a shade place for air drying;
and (6): and (3) putting the calcium magnesium phosphate fertilizer, the powdery excrement in the step (1), the granular clay mineral in the step (2), the granular zeolite in the step (2) and the straw powder with the brevibacillus laterosporus in the step (5) into a mixer, and uniformly stirring to prepare the conditioner.
5. The conditioner for remediating heavy metal soil and the preparation method thereof as claimed in claim 4, wherein the conditioner comprises: the liquid fermentation medium in the step (3) comprises the following components in percentage by mass: 1.0% of bean cake powder, 2.0% of yeast powder, 1.0% of shrimp meal, 0.05% of sodium chloride and the balance of water, wherein the pH value is 7.0.
6. The conditioner for remediating heavy metal soil and the preparation method thereof as claimed in claim 4, wherein the conditioner comprises: and (3) adopting a 60-140-mesh screen in the screening in the step (1), the step (2) and the step (5).
7. The conditioner for remediating heavy metal soil and the preparation method thereof as claimed in claim 4, wherein the conditioner comprises: the air inlet temperature of the spray drying in the step (4) is 150-200 ℃, and the air outlet temperature is 80-100 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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