CN114847121A - Method for preparing mine restoration nutrient soil by utilizing urban solid wastes - Google Patents
Method for preparing mine restoration nutrient soil by utilizing urban solid wastes Download PDFInfo
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- CN114847121A CN114847121A CN202210578309.3A CN202210578309A CN114847121A CN 114847121 A CN114847121 A CN 114847121A CN 202210578309 A CN202210578309 A CN 202210578309A CN 114847121 A CN114847121 A CN 114847121A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/10—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material
- A01G24/17—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material containing slag
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/10—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/20—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material
- A01G24/28—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material containing peat, moss or sphagnum
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
Abstract
The invention discloses a method for preparing mine restoration nutrient soil by utilizing urban solid wastes, which comprises the following steps: 1) crushing greening solid wastes; 2) mixing raw material municipal sludge, dried greening solid waste particles and a microbial fermentation agent, stirring and piling up the mixture into a pile body, controlling the water content of the mixed material to be 45-65%, and opening air holes on the pile body for primary fermentation; 3) when the internal temperature of the mixed material pile body rises to 65 ℃, turning and reducing the temperature once every two days, maintaining the pile body temperature above 55 ℃ for 15 days, and then fermenting at a high temperature to obtain a fermented material; 4) mixing, stirring and stacking the fermented material, the fly ash and the tail mud, performing secondary fermentation, and cooling the stack to the ambient temperature to obtain the mine restoration nutrient soil. The invention has the advantages of recycling urban solid wastes and improving the efficiency of ecological restoration of mines and waste quarry sites.
Description
The technical field is as follows:
the invention relates to the fields of mine ecological restoration and municipal sludge, power plant fly ash, mine waste tail mud and greening solid waste resource utilization, in particular to a preparation method of mine ecological restoration compound nutrient soil taking municipal sludge, greening solid waste and tail mud as main matrixes.
Background art:
municipal sludge is a by-product of municipal sewage treatment. Along with the advance of the urbanization process of China, the municipal sewage treatment amount is increased year by year, and the municipal sludge yield is increased. Municipal sludge contains certain pollutants, possibly carries pathogenic microorganisms, has high water content, and can avoid secondary pollution only by proper treatment or resource utilization. However, since the sludge in inland cities is mainly piled in the open air, unpleasant odor brings discomfort to people around, and the sludge contains organic substances, pathogenic bacteria and other components, which cause secondary pollution when directly piled or used. The municipal sludge contains rich organic matters and plant nutrient elements such as nitrogen, phosphorus and the like, which are nutrient elements required by plant growth, and the municipal sludge can be used as mine restoration nutrient soil after fermentation treatment.
Mine ecological restoration generates a large amount of greening solid wastes such as dead trees, dry branches and fallen leaves every year, generally mainly collects and stacks the trees, and occupies a large amount of places to be consumed everywhere. The natural air-dried greening waste has high carbon content and low water content, the sludge has high nitrogen content and high water content, the natural air-dried greening waste and the sludge are mixed according to a proper proportion, the C/N ratio and the water content required by high-temperature fermentation can be achieved, the landscaping waste composite sludge is utilized to pile up the nutrient soil, the physicochemical conditions of the piled up nutrient soil can be met, and the resource utilization of the landscaping waste and the wastewater treatment sludge can be realized.
The fly ash is a main solid waste of a coal-fired power plant, the electricity consumption demand is continuously increased along with the continuous development of economy, the fly ash discharge amount of the coal-fired power plant is increased year by year, a large amount of fly ash is directly stacked in a mine without treatment, a large amount of fly ash is generated, and serious pollution is caused to the surrounding environment such as atmosphere, water, soil and the like. Researches show that calcium hydroxide in the fly ash has a flocculation effect, and silicon oxide and aluminum oxide in the fly ash have a heavy metal adsorption effect, so that the calcium hydroxide has an important significance for improving the heavy metal pollution of mine soil.
A large amount of tail mud is generated in wet sand making in a mine and is stacked in a tail mud pool mode, so that a large amount of land is occupied.
The ecological restoration of mines often faces the problem that waste mine pits are poor in soil and cannot be used for planting vegetation. The nutrient soil prepared by using the urban solid wastes as main raw materials can be used in the ecological restoration of mines, the shortage of native soil is made up, meanwhile, higher fertility has positive significance in the ecological restoration, and the effects of reducing, recycling and harmlessness of the solid wastes are achieved.
The invention content is as follows:
the first purpose of the invention is to provide a method for preparing mine restoration nutrient soil by utilizing urban solid wastes;
the second purpose of the invention is to provide a mine restoration nutrient soil;
the third purpose of the invention is to provide the application of the nutrient soil for repairing the mine.
The first purpose of the invention is implemented by the following technical scheme: the invention provides a preparation method of mine ecological restoration nutrient soil, which comprises the following raw materials of municipal sludge, greening solid waste and microbial fermentation inoculum; the mass of the greening solid waste is 25-35% of that of the municipal sludge, the mass of the microbial agent is 0.01-0.02% of that of the dehydrated municipal sludge, and the municipal sludge, the greening solid waste and the microbial fermentation microbial inoculum are fermented once to form a fermentation material.
In the preparation method, the raw material also comprises fly ash, and the volume of the fly ash can be 0-10% of the volume of the fermentation material body machine.
In the preparation method, the raw materials also comprise a large amount of tail mud generated by wet sand making in a mine, and the volume of the tail mud can be 50-100% of the volume of the fermentation material.
In the preparation method, the water content of the municipal sludge is 75-81%, and specifically can be 80.5 +/-0.1%. The water content of the air-dried greening solid waste is less than 28 percent, and specifically can be 26.5 +/-0.0 percent.
In the preparation method, the water content of the fly ash is less than 1 percent, and specifically can be 0.05 percent.
In the above preparation method, the moisture content of the tail mud is less than 25%, specifically 22.6%, and the preparation steps are as follows: 1) the grinder crushes the naturally air-dried greening solid waste into dry particles; 2) mixing raw sludge and dry particles with a microbial fermentation agent, stirring, stacking into a pile, wherein the water content of the mixed material is 45-65%, opening air holes on the pile, performing primary fermentation, and covering with a waterproof cloth in rainy days; 3) when the temperature rises to 65 ℃, turning the pile once every two days to reduce the temperature, maintaining the pile temperature above 55 ℃ for 15 days, and performing high-temperature fermentation once to obtain the required fermentation material; 4) and stirring and stacking the obtained fermented material, the fly ash and the tail mud, performing secondary fermentation, and cooling the stack to the ambient temperature to obtain the mine restoration nutrient soil.
In the above preparation method, in step 2), the length and width of the bottom of the stack may be at least 3m (for example, 3.5m in length and 3m in width), and the height may be 1.5 to 2.0m (for example, 1.5 m); the surface of the pile body can be covered with materials such as rain-proof cloth and the like in the primary fermentation; in the step 3), the pile turning frequency is as follows: when the temperature of the stack body reaches more than 65 ℃, the stack is turned once every 1-3 d (such as 2 days), the total time length is not less than 15d, wherein the temperature of the stack body is more than 55 ℃ and is at least 15 d.
In the above preparation method, in the step 2), the height of the stack body during the open stacking is 1.5-2.0m (such as 1.5m), and the stacking time is not less than 15 days.
The second purpose of the invention is implemented by the following technical scheme: the mine ecological restoration nutrient soil prepared by the preparation method.
The third object of the invention is implemented by the following technical scheme: the invention further provides application of the mine ecological restoration nutrient soil in ecological restoration of plants planted in mines and waste quarry sites.
In the application, the mine and the waste quarry are gravel, gravel or bedrock, especially soil with poor nutrient substances and poor water retention;
the planting is carried out in a mode of cutting, planting, transplanting or directly sowing seeds;
the plants comprise pine seeds for mine ecological restoration, such as Chinese pine, pinus sylvestris, wild peaches, wild apricots and the like;
the application mode is as follows: the mine ecological restoration nutrient soil covering can be stirred with in-situ soil, and the mine ecological restoration nutrient soil can also be directly spread on the in-situ soil.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention makes the urban solid waste be utilized as resources;
(2) the invention can provide a large amount of nutrient soil for ecological restoration of mines and improve the efficiency of ecological restoration of mines and waste quarry sites.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a process flow chart of a preparation method of mine ecological restoration nutrient soil with urban solid wastes as main matrixes.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The municipal sludge is obtained from the drainage industry Co., Ltd of Baotou city, and has a water content of 81 +/-0.1%.
The greening solid waste is prepared by crushing dead branches, dead trees and fallen leaves generated by ecological restoration of Daqingshan mountain in Baotou city, and the water content is 26.5 +/-0.0%.
The microbial fermentation inoculum is a Jinbaobei brand I-type fertilizer starter produced by Beijing Huaxia Kangyuan science and technology Limited, and the starter flora is a composite flora composed of various natural beneficial microorganisms such as mycelial bacteria, filamentous bacteria, saccharomycetes, actinomycetes and the like, and has extremely strong aerobic fermentation performance.
The fly ash is provided by a second thermal power plant Baotou of the North United electric Power Limited liability company, the water content is 0.05 percent, and the specific properties are shown in Table 1.
Table 1, fly ash property units: % by mass
Example 1 preparation of mine ecological restoration nutrient soil by using urban solid wastes as main matrix
The municipal sludge has a water content of about 75-81% and an organic matter content of 44.3% (weight method).
Preparing materials according to the following formula, wherein each formula comprises 8.0-10.0t of total materials, performing primary fermentation to obtain a fermentation material, mixing the fermentation material with fly ash and air-dried tail mud, and performing secondary fermentation to obtain the mine restoration nutrient soil, wherein the primary fermentation material formula is municipal sludge: air drying, greening and waste fixing: 1, microbial fermentation inoculant: 25%: 0.01% (weight ratio); then fermenting the materials: tail mud: 100% of fly ash: 100%: 5 percent of the mixture is mixed according to the volume ratio and then is fermented for the second time to prepare the mine restoration nutrient soil;
the preparation method of the mine ecological restoration nutrient covering soil according to the process flow diagram shown in figure 1 comprises the following specific steps:
1) crushing the materials, wherein the particle sizes of the crushed materials are respectively within 2cm of air-drying greening solid waste;
2) mixing materials, namely uniformly mixing municipal sludge, air-dried greening solid waste and a microbial fermentation inoculant according to the proportion of the formula to obtain a mixed material;
3) performing turning type primary fermentation, namely stacking the mixed materials on the concrete ground to form a stack body with the bottom length of 3m, the width of 3m and the height of l.5m, covering cloth for rain prevention in rainy days, and turning the stack body once every 2d after the temperature of the stack body is raised to more than 65 ℃, wherein the temperature of the stack body is kept for more than 15d at more than 55 ℃;
4) and (3) performing secondary fermentation, after the field natural decomposition, uniformly mixing the primary fermentation material with the air-dried tail mud and the fly ash, and stacking, wherein the temperature of the pile body is reduced to the ambient temperature, and the odor is extremely low, so that the mine ecological restoration nutrient soil is obtained.
Example 2, preparation of mine ecological restoration nutrient soil by using urban solid wastes as main matrix
The municipal sludge has a water content of about 75-81% and an organic matter content of 44.3% (weight method).
Preparing materials according to the following formula, wherein each formula comprises 8.0-10.0t of total materials, performing primary fermentation to obtain a fermentation material, mixing the fermentation material with fly ash and air-dried tail mud, and performing secondary fermentation to obtain the mine restoration nutrient soil, wherein the primary fermentation material formula is municipal sludge: air drying, greening and waste fixing: 1, the microbial fermentation inoculum is: 25%: 0.01% (weight ratio); then fermenting the materials: tail mud: 100% of fly ash: 100%: mixing 10% of the mixture according to the volume ratio, and performing secondary fermentation to prepare the mine restoration nutrient soil;
preparing the mine ecological restoration nutrition covering soil according to the process flow chart shown in figure 1, and specifically comprising the following steps:
1) crushing the materials, wherein the particle sizes of the crushed materials are respectively within 2cm of air-drying greening solid waste;
2) mixing materials, namely uniformly mixing municipal sludge, air-dried greening solid waste and a microbial fermentation inoculant according to the proportion of the formula to obtain a mixed material;
3) performing turning type primary fermentation, namely stacking the mixed materials on the concrete ground to form a stack body with the bottom length of 3m, the width of 3m and the height of l.5m, covering cloth for rain prevention in rainy days, and turning the stack body once every 2d after the temperature of the stack body is raised to more than 65 ℃, wherein the temperature of the stack body is kept for more than 15d at more than 55 ℃;
4) and (3) performing secondary fermentation, after the field natural decomposition, uniformly mixing the primary fermentation material with the air-dried tail mud and the fly ash, and stacking, wherein the temperature of the pile body is reduced to the ambient temperature, and the odor is extremely low, so that the mine ecological restoration nutrient soil is obtained.
Example 3 preparation of mine ecological restoration nutrient soil with urban solid wastes as main matrix
The municipal sludge has a water content of about 75-81% and an organic matter content of 44.3% (weight method).
Preparing materials according to the following formula, wherein the total materials in each formula are 8.0-10.0t, performing primary fermentation to obtain a fermentation material, mixing the fermentation material with fly ash and air-dried tail mud, and performing secondary fermentation to obtain the mine restoration nutrient soil, wherein the formula of the primary fermentation material is municipal sludge: air drying, greening and waste fixing: 1, microbial fermentation inoculant: 25%: 0.01% (weight ratio); then fermenting the materials: tail mud: 100% of fly ash: 50%: 5 percent of the raw materials are mixed according to the volume ratio and then are subjected to secondary fermentation to prepare the mine restoration nutrient soil;
preparing the mine ecological restoration nutrition covering soil according to the process flow chart shown in figure 1, and specifically comprising the following steps:
1) crushing the materials, wherein the particle sizes of the crushed materials are respectively within 2cm of air-drying greening solid waste;
2) mixing materials, namely uniformly mixing municipal sludge, air-dried greening solid waste and a microbial fermentation inoculant according to the proportion of the formula to obtain a mixed material;
3) performing turning type primary fermentation, namely stacking the mixed materials on the concrete ground to form a stack body with the bottom length of 3m, the width of 3m and the height of l.5m, covering cloth for rain prevention in rainy days, and turning the stack body once every 2d after the temperature of the stack body is raised to more than 65 ℃, wherein the temperature of the stack body is kept for more than 15d at more than 55 ℃;
4) and (3) performing secondary fermentation, after the field natural decomposition, uniformly mixing the primary fermentation material with the air-dried tail mud and the fly ash, and stacking, wherein the temperature of the pile body is reduced to the ambient temperature, and the odor is extremely low, so that the mine ecological restoration nutrient soil is obtained.
Example 4 preparation of mine ecological restoration nutrient soil with urban solid wastes as main matrix
The municipal sludge has a water content of about 75-81% and an organic matter content of 44.3% (weight method).
Preparing materials according to the following formula, wherein each formula comprises 8.0-10.0t of total materials, performing primary fermentation to obtain a fermentation material, mixing the fermentation material with fly ash and air-dried tail mud, and performing secondary fermentation to obtain the mine restoration nutrient soil, wherein the primary fermentation material formula is municipal sludge: air drying, greening and waste fixing: 1, microbial fermentation inoculant: 25%: 0.01% (weight ratio); then fermenting the materials: tail mud: 100% of fly ash: 50%: mixing 10% of the mixture according to the volume ratio, and performing secondary fermentation to prepare the mine restoration nutrient soil;
the preparation method of the mine ecological restoration nutrient covering soil according to the process flow diagram shown in figure 1 comprises the following specific steps:
1) crushing the materials, wherein the particle sizes of the crushed materials are respectively within 2cm of air-drying greening solid waste;
2) mixing materials, namely uniformly mixing municipal sludge, air-dried greening solid waste and a microbial fermentation inoculant according to the proportion of the formula to obtain a mixed material;
3) performing turning type primary fermentation, namely stacking the mixed materials on the concrete ground to form a stack body with the bottom length of 3m, the width of 3m and the height of l.5m, covering cloth for rain prevention in rainy days, and turning the stack body once every 2d after the temperature of the stack body is raised to more than 65 ℃, wherein the temperature of the stack body is kept for more than 15d at more than 55 ℃;
4) and (3) performing secondary fermentation, after the field natural decomposition, uniformly mixing the primary fermentation material with the air-dried tail mud and the fly ash, and stacking, wherein the temperature of the pile body is reduced to the ambient temperature, and the odor is extremely low, so that the mine ecological restoration nutrient soil is obtained.
Example 5, examples 1-4 the main properties of the nutrient casing prepared
The method for measuring the content of the organic matters comprises the following steps: putting the uniformly mixed sample into a porcelain crucible which is weighed to be constant in weight, firstly putting the sample with large water content on a water bath pot for drying by distillation, then putting the sample into an oven for drying to be constant in weight, directly putting the dried sample into a constant temperature oven for drying to be constant in weight, and then putting the dried sample into a muffle furnace for firing. And calculating the content of the organic matters according to a formula.
Total Nitrogen (TN) determination method: digesting the sample by sulfuric acid-hydrogen peroxide, converting organic nitrogen into ammonium sulfate, absorbing ammonia distilled by alkalization by boric acid, titrating by a standard solution, and determining the total nitrogen content in the sample. The results are in terms of N.
Total Phosphorus (TP) determination method: with HCl0 4 -H 2 SO 4 And (3) digesting the solution, decomposing the sample, reacting phosphate ions with an ammonium vanadate reagent for color development, and measuring the phosphorus content by using a spectrophotometer. The results are reported as P20 s.
Total potassium (TK) assay: measured by NaOH melt-flame photometer. The results are reported as K20.
The method for measuring the water content comprises the following steps: putting the uniform sample in an evaporating dish which is weighed to constant weight, evaporating the sample to dryness on a water bath, putting the sample in an oven at 103-105 ℃ and drying the sample to constant weight, wherein the reduced weight is the water content of the sample in percentage.
The method for measuring the pH value comprises the following steps: and measuring by an electrode method.
The method for measuring the faecal coliform population comprises the following steps: coliform group bacteria in the sample were measured by a filtration membrane method.
The method for measuring the death rate of the roundworm eggs comprises the following steps: the roundworm eggs in the sample are determined by an egg collection method.
The method for measuring the leaching toxicity of the heavy metal comprises the following steps: according to the national environmental protection industry standard & lt & ltsolid waste leaching toxicity leaching method & lt & gtsulfuric acid-nitric acid method & gt (HJ/T299-2007 & lt/EN & gt), leaching is carried out by the sulfuric acid-nitric acid method, the pH range of a leaching agent is 3.20 +/-0.05, and the process of leaching toxic substances into an environmental medium by acidic precipitation is simulated. The concentration of heavy metals in the supernatant of the leachate was determined by inductively coupled plasma mass spectrometry (ICP-MS, ThermoFisher, Germany, type X Series 2).
The method for measuring the germination rate of the seeds comprises the following steps: mixing the air-dried sample with deionized water according to the weight ratio of 1: 10 (w: v), mixing, leaching and shaking for 2h, separating the leaching liquor in a 10000r/min centrifuge for 20min, and filtering the supernatant through a 0.45 mu m filter membrane. A piece of filter paper was placed in a clean petri dish, 5mL of the filtrate and 20 cabbage seeds were added, and incubated in a dark box at 25 ℃ for 48 h. And recording the germination quantity of the seeds, and calculating the germination rate of the seeds.
Table 2 main properties of nutrient soils prepared in examples 1-4
Note: execution Standard "agricultural sludge contamination control Standard
Table 3 main properties of nutrient soils prepared in examples 1-4
Note: execution Standard "agricultural sludge contamination control Standard
From the table 2 and the table 3, it can be seen that the mine ecological restoration nutrient soil prepared in the examples 1 to 4 has organic matter content, water content, pH, ascarid egg death rate, arsenic, mercury, lead, cadmium, chromium and other heavy metal content all within the standard limit range of the agricultural sludge pollutant control standard, and the number of coliform groups of the mine ecological restoration nutrient soil manure prepared in the examples 1 to 4 is as low as about 90/g, and the germination rate is as high as 100% when the mine ecological restoration nutrient soil is used for seed germination test, so that the mine ecological restoration nutrient soil prepared by the method can be completely used for mine restoration.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A method for preparing mine restoration nutrient soil by utilizing urban solid wastes is characterized by comprising the following steps: the mine restoration nutrient soil comprises the following raw materials: municipal sludge, greening solid waste, a microbial starter, fly ash and mine tail mud;
the preparation method of the mine restoration nutrient soil comprises the following steps:
1) crushing the naturally air-dried greening solid waste into dry greening solid waste particles;
2) when the environmental temperature is higher than the environmental starting temperature, mixing the raw material municipal sludge, the dried greening solid waste particles and the microbial fermentation agent according to the mass ratio of 100: 25-35: 0.01-0.02 percent of the mixture is stirred and piled into a pile body, the water content of the mixture is controlled to be 45-65 percent, air holes are opened on the pile body for primary fermentation, and rain-proof cloth is covered on the pile body in rainy days;
3) when the temperature in the mixed material pile rises to 65 ℃, turning over the pile once every two days to reduce the temperature, maintaining the pile temperature above 55 ℃ for 15 days, and performing high-temperature fermentation once to obtain a fermented material;
4) the fermented material, the fly ash and the tail mud are mixed according to the volume ratio of 100: 0-10: 50-100 of the nutrient soil is mixed, stirred and stacked, secondary fermentation is carried out, and the temperature of the stacked body is reduced to the ambient temperature to obtain the mine restoration nutrient soil.
2. The method for preparing the mine restoration nutrient soil by using the urban solid waste, according to claim 1, is characterized in that: the water content of the municipal sludge is 75-81%.
3. The method for preparing the mine restoration nutrient soil by using the urban solid waste, according to claim 1, is characterized in that: the water content of the air-dried greening solid waste is less than 28%.
4. The method for preparing the mine restoration nutrient soil by using the urban solid waste, according to claim 1, is characterized in that: the particle size of the dried greening solid waste particles is within 2 cm.
5. The method for preparing the mine restoration nutrient soil by using the urban solid waste, according to claim 1, is characterized in that: the environmental start temperature is above 10 ℃.
6. The method for preparing the mine restoration nutrient soil by using the urban solid waste, according to claim 1, is characterized in that: in the S2, the volume of the mixed material stack is 10m 3 The above.
7. The mine ecological restoration nutrient soil prepared by the preparation method of any one of claims 1-6.
8. The mine restoration nutrient soil of claim 7 is applied to plants for ecological restoration such as mines, waste quarries and the like, and is not applied to crops.
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