CN113636896A - Method for promoting sandy aggregate dewatered sludge to be in soil by using wood processing excess material and biochar thereof - Google Patents
Method for promoting sandy aggregate dewatered sludge to be in soil by using wood processing excess material and biochar thereof Download PDFInfo
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Abstract
The invention provides a method for promoting sandstone aggregate dewatered sludge to be soil by utilizing wood processing excess materials and biochar thereof. The excellent planting soil prepared by the method has reasonable structure, high fertilizer efficiency, strong water retention and drought resistance, the heavy metal content meets the national and industrial standards, the method is suitable for the growth and development of most plants, the social problems of land occupation by wastes, environmental pollution and the like are solved, the embarrassment of land resource shortage in agriculture and forestry is relieved, and the method has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of soil science, and particularly relates to a method for promoting the desertification of sandstone aggregate dehydrated sludge by using wood processing excess materials and biochar thereof.
Background
The wood processing excess material comprises sawdust, wood shavings, leftover materials and the like, the main components are carbon, oxygen, hydrogen, nitrogen and inorganic salt, and the carbon-nitrogen ratio is about 225: 1. as organic waste, wood processing excess material has wide source, low price, looseness, porosity and strong water retention and physiological acidity, and has good promotion effect on soil improvement. However, because the ratio of carbon to nitrogen is very high, the carbon cannot be effectively degraded, and the wood processing residue contains a large amount of mixed bacteria and pathogenic microorganisms, the wood processing residue is not suitable for being directly applied to soil.
The dehydrated sludge of the sandstone aggregate is solid sediment generated by a sandstone aggregate production system, macroscopically shows the shapes of solid powder such as rock powder, fiber and the like, coagulated floccules, colloids and the like, comprises inorganic or heavy metal elements such as silicon, aluminum, iron, calcium and the like, microorganisms and the like, a small amount of solidified organic matters, nitrogen, phosphorus, potassium and other nutrient elements, and has the water content of more than 85 percent. The dehydrated sludge powder of the sandstone aggregate is fine, becomes slurry when meeting water and becomes powder when being dried, and has the defects of organic matter shortage, low biological production, heavy metal enrichment and the like, so the method is not suitable for the normal growth and development of most plants.
How to properly control the physical and chemical properties of the wood processing excess material and the sandstone aggregate dewatered sludge and scientifically utilize the nutritional value of the wood processing excess material to promote the sandstone aggregate dewatered sludge to be in soil is an effective way for reducing the potential environmental risks of the wood processing excess material and the sandstone aggregate dewatered sludge, and meanwhile, the embarrassment of the shortage of agriculture and forestry land resources can be relieved, and the method has great scientific and theoretical value and wide popularization and application prospects.
Disclosure of Invention
The invention aims to provide a method for promoting the desertification of the sandstone aggregate dewatered sludge by using wood processing excess materials and biochar thereof, the method improves the defects of low fertility, heavy metal enrichment and the like of the sandstone aggregate dewatered sludge by using the wood processing excess materials and the biochar thereof, the wood processing excess materials and the biochar thereof are scientifically applied, and other auxiliary materials are properly added to realize the desertification so as to provide excellent planting soil for the growth and development of plants.
In order to achieve the technical features, the invention is realized as follows: the method for promoting the desertification of the sandstone aggregate dehydrated sludge by utilizing the wood processing excess material and the biochar thereof comprises the following steps:
step one, wood processing excess material pretreatment:
1) removing non-lignin impurities in the excess materials, and drying the excess materials until the water content is less than or equal to 10%;
2) crushing part of the rest materials to the particle size of 1-2cm to obtain a biochar raw material; part of the crushed materials are crushed to the particle size of less than or equal to 2mm, and the carbon-nitrogen ratio is adjusted to 25-30 by using 1.3-1.6% urea solution: 1, obtaining a decomposed material raw material;
step two, preparing the biochar:
1) sending the biochar raw material into a carbonization furnace for temperature-controlled and oxygen-limited pyrolysis to obtain solid biochar, condensing and standing the generated gas, taking the upper layer of pyroligneous liquor for later use, and using the lower layer of tar for preparing chemical products;
2) soaking solid biochar in HCL solution and NaOH solution in sequence, oscillating for 1-2h, then washing, drying, crushing and screening to obtain modified biochar particles;
step three, curing agent preparation:
taking modified biochar particles, adding curing auxiliary materials, namely zeolite particles and cationic polyacrylamide, and mixing the modified biochar particles, the zeolite particles and the cationic polyacrylamide in a dry mass ratio of 9-11: 0.9-1.1: 1.8-2.2, and uniformly mixing to obtain a curing agent;
step four, sand aggregate dehydrated sludge pretreatment:
1) adding a curing agent accounting for 1-1.5% of the mass of the completely dried sludge, fully mixing, and reducing the harm of heavy metals in the sludge to plant growth through the curing and stabilizing effects of the curing agent to obtain muddy sludge;
2) dehydrating the sludge, and crushing when the water content is reduced to 8-10% to obtain powdery sludge;
step five, preparing the decomposed substances:
1) taking decomposed raw materials, a fermentation microbial inoculum and fermentation auxiliary materials according to a dry mass ratio of 495-505: 9.9-10.1: 0.99-1.01, uniformly mixing, putting into a fermentation tank, adjusting the initial temperature to 25-30 ℃ and the humidity to 55-60%, and carrying out aerobic fermentation for 30-40 d;
2) turning once every 3-5 days in the fermentation period, and obtaining decomposed substances with the water content of 30-35% after the fermentation is finished;
step six, planting soil preparation:
1) taking powdery sludge and decomposed substances, and mixing the powdery sludge and the decomposed substances according to a dry mass ratio of 95-105: 45-55, uniformly mixing, and preparing planting soil;
2) and (3) diluting the wood vinegar liquid by 30-50 times to obtain a wood vinegar fertilizer, and spraying the wood vinegar fertilizer to the planting soil to obtain the excellent planting soil of the terminal product.
And in the second step, the temperature-controlled oxygen-limited pyrolysis treatment is carried out at a heating rate of 8-10 ℃/min until the temperature reaches 300-400 ℃, the temperature is kept for 1-2 hours, and nitrogen is filled as a protective gas during pyrolysis.
And in the second step, the concentrations of the HCL solution and the NaOH solution are both 0.8-1.2 mol/L.
In the second step, the particle size of the modified biochar particles is less than or equal to 1.0mm, and the specific surface area is 50m 2/g-85 m 2/g.
In the third step, the zeolite particles are porous silicate with the pH value of 7.0-7.5 and the particle size of 1.0-1.2 mm.
In the third step, the cationic polyacrylamide is a water-soluble high-molecular polymer with the molecular weight of 600-1200 ten thousand.
In the fourth step, the sandstone aggregate dewatered sludge is waste generated by a sandstone aggregate production system, the main component is silicon dioxide, the particle size is less than 0.075mm, and the volume ratio is more than or equal to 85%.
The fermentation microbial inoculum is compounded by beneficial microorganisms consisting of photosynthetic bacteria, saccharomycetes and lactic acid bacteria and extracellular enzymes thereof, the water content is 20-30%, and the number of effective viable bacteria is more than or equal to 0.30 hundred million/g.
And fifthly, the fermentation auxiliary materials are ground phosphate rock, potassium sulfate and water-absorbent polymer resin according to a dry mass ratio of 0.9-1.1: 0.9-1.1: 4.5-5.5, and mixing uniformly; the main component of the phosphate rock powder is fluorapatite, and the particle size is 0.05-0.07 mm; the potassium sulfate is water-soluble potassium fertilizer, and the potassium content is more than or equal to 50 percent; the pH value of the water-absorbent polymer resin is 6.8 to 8.0, and the particle diameter is 0.45 to 0.85 mm.
And fifthly, the index parameters of the decomposed quality are as follows: the pH value is 6.3-6.8, the organic matter content is 42-48%, the total nitrogen content is 2.63-2.87%, the total phosphorus content is 1.24-1.56%, and the total potassium content is 1.16-1.34%.
Good planting in step sixSoil index parameters: the pH value is 6.5-7.2, and the volume weight is 1.15-1.45 g/cm3The composite material is characterized by comprising 53-57% of porosity, 23-28% of water content, 45-55 g/kg of organic matters, 2.2-2.5 g/kg of total nitrogen, 35-45 mg/kg of available phosphorus, 140-170 mg/kg of quick-acting potassium, less than or equal to 2.5mg/kg of Cr, less than or equal to 30mg/kg of Cu, less than or equal to 2.0mg/kg of Hg, less than or equal to 8.0mg/kg of Ni and less than or equal to 70mg/kg of Zn.
The invention has the following beneficial effects:
1. the invention solves the social problems of land resource occupation, environmental pollution and the like of engineering construction waste sandstone aggregate dewatered sludge, and realizes the recycling, reduction and harmless utilization of the engineering construction waste sandstone aggregate dewatered sludge.
2. The invention solidifies the heavy metal in the soil and improves the soil structure and fertility by preparing the biochar and the decomposed matter from the wood processing residual material, and promotes the sandstone aggregate dewatered sludge to be soil-based. The specific surface area and the pore volume are increased through the modification treatment of the biochar, and the curing stability of the biochar can be effectively improved; pyrolyzate pyroligneous liquor is rich in various organic compounds, and has good effects of increasing soil fertility and promoting plant growth; the fermentation inoculum can rapidly increase the temperature of the stack, degrade toxic components, inhibit the propagation of harmful microorganisms and accelerate the decomposition speed; the potassium sulfate supplements potassium fertilizer and simultaneously forms a weak acid fermentation environment to promote the ground phosphate rock to gradually separate out effective phosphorus components, so as to be beneficial to plant absorption and utilization; the water-absorbent polymer resin can improve the content of water-stable aggregates in soil and reduce leaching loss of soil nutrients.
3. The main component of the dehydrated sludge of the sandstone aggregate, which is one of the main raw materials provided by the invention, is silicon dioxide, and the dehydrated sludge is a potential soil resource. The wood processing excess material promotes the sandy aggregate dehydrated sludge to be soil by various modes such as solidifying heavy metal, conditioning structure, improving fertility and the like.
4. Multiple tests prove that the planting soil prepared from the raw materials has the advantages of reasonable structure, high fertilizer efficiency, strong water retention and drought resistance, and heavy metal content meeting national and industrial standards, is suitable for the growth and development of most plants, can effectively relieve the embarrassment of soil resource shortage in agriculture and forestry, and is an important measure for practicing the national ecological civilization strategy and putting forward green, cyclic and low-carbon development.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a flow chart of the present invention.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, the present invention will be described in detail with reference to specific embodiments. It should be noted that technical features or combinations of technical features described in the following embodiments should not be considered as being isolated, and they may be combined with each other to achieve better technical effects.
Firstly, preparing raw materials:
sand aggregate sludge: the main component is silicon dioxide, the water content is more than or equal to 85 percent, and the volume of the particles with the particle size of less than 0.075mm accounts for more than or equal to 85 percent.
Wood processing excess material: selecting sawdust, wood shavings, leftover materials and the like, removing non-lignin impurities, and drying until the water content is less than or equal to 10%.
HCL solution and NaOH solution: the concentration is 0.8 to 1.2 mol/L.
Urea solution: the concentration is 1.3-1.6%.
Zeolite particles: a porous silicate having a pH of 7.0 to 7.5 and a particle diameter of 1.0 to 1.2 mm.
Cationic polyacrylamide: a water-soluble high molecular polymer having a molecular weight of 600 to 1200 ten thousand.
Fermentation inoculum: the microbial composite fertilizer is compounded by beneficial microorganisms such as photosynthetic bacteria, saccharomycetes, lactic acid bacteria and the like and extracellular enzymes thereof, the water content is 20-30%, and the effective viable count is more than or equal to 0.30 hundred million/g.
Water-absorbent Polymer resin: the pH value is 6.8-8.0, and the particle size is 0.45-0.85 mm.
Powdered rock phosphate: the main component is fluorapatite with the grain diameter of 0.05-0.07 mm.
Potassium sulfate: the water-soluble potassium fertilizer has a potassium content of more than or equal to 50 percent.
Second, specific preparation example:
example 1:
a method for promoting the desertification of the sand aggregate dehydrated sludge by using wood processing excess materials and biochar thereof comprises the following steps:
step one, wood processing excess material pretreatment: removing non-lignin impurities such as metal, plastic and the like, and drying the impurities until the water content is 8%; partially crushing to obtain a particle size of 2cm to obtain a biochar raw material; part of the powder is crushed to the grain diameter of 1mm, and the carbon nitrogen ratio is adjusted to 28 by urea solution with the concentration of 1.5 percent: 1, obtaining a decomposed material raw material;
step two, preparing the biochar: 1) sending the biochar raw material into a carbonization furnace for temperature-controlled and oxygen-limited pyrolysis for 2 hours to obtain solid biochar, condensing and standing the generated gas, taking the upper layer of pyroligneous liquor for later use, and using the lower layer of tar for preparing chemical products; 2) soaking solid biochar in HCL solution and NaOH solution in sequence, oscillating for 1.5h, then washing, drying, crushing and screening to obtain modified biochar particles with the particle size of 1.0 mm;
step three, curing agent preparation: taking modified biochar particles, adding curing auxiliary materials of zeolite particles and cationic polyacrylamide, and mixing the modified biochar particles, the zeolite particles and the cationic polyacrylamide according to a dry mass ratio of 9: 0.9: 1.8, uniformly mixing to obtain a curing agent;
step four, sand aggregate dehydrated sludge pretreatment: 1) adding a curing agent with the mass of 1.5 percent of the completely dried sludge, fully mixing, and reducing the harm of heavy metals in the sludge to plant growth through the curing and stabilizing effects of the curing agent to obtain muddy sludge; 2) dehydrating the sludge, and crushing when the water content is reduced to 8% to obtain powdery sludge;
step five, preparing the decomposed substances: 1) taking decomposed raw materials, a fermentation microbial inoculum and fermentation auxiliary materials according to a dry mass ratio of 495: 9.9: 0.99, uniformly mixing, putting into a fermentation tank, adjusting the initial temperature to be 30 degrees and the humidity to be 58 percent, and carrying out aerobic fermentation for 35 d; 2) turning over every 5d in the fermentation period, and obtaining the decomposed substances with the water content of 32 percent after the fermentation is finished.
Step six, planting soil preparation: 1) taking powdery sludge and decomposed substances, and mixing the powdery sludge and the decomposed substances according to a dry mass ratio of 95: 45, uniformly mixing, and preparing planting soil; 2) and (3) diluting the wood vinegar liquid by 40 times to obtain wood vinegar fertilizer, and spraying the wood vinegar fertilizer to the planting soil to obtain the excellent planting soil of the terminal product.
Example 2:
a method for promoting the desertification of the sand aggregate dehydrated sludge by using wood processing excess materials and biochar thereof comprises the following steps:
step one, wood processing excess material pretreatment: removing non-lignin impurities such as metal, plastic and the like, and drying the impurities until the water content is 10%; partially crushing to obtain a particle size of 1cm to obtain a biochar raw material; part of the powder is crushed to the particle size of 0.8mm, and the carbon nitrogen ratio is adjusted to 30 by using 1.5 percent urea solution: 1, obtaining a decomposed material raw material;
step two, preparing the biochar: 1) sending the biochar raw material into a carbonization furnace for temperature-controlled and oxygen-limited pyrolysis for 1.5h to obtain solid biochar, condensing and standing the generated gas, taking the upper layer of pyroligneous liquor for later use, and using the lower layer of tar for preparing chemical products; 2) soaking solid biochar in HCL solution and NaOH solution in sequence, oscillating for 2h, then washing, drying, crushing and screening to obtain modified biochar particles with the particle size of 0.9 mm;
step three, curing agent preparation: taking modified biochar particles, adding curing auxiliary materials of zeolite particles and cationic polyacrylamide, and mixing the modified biochar particles, the zeolite particles and the cationic polyacrylamide according to a dry mass ratio of 11: 1.1: 2.2, uniformly mixing to obtain a curing agent;
step four, sand aggregate dehydrated sludge pretreatment: 1) adding a curing agent accounting for 1.3 percent of the mass of the completely dried sludge, fully mixing, and reducing the harm of heavy metals in the sludge to plant growth through the curing and stabilizing effects of the curing agent to obtain muddy sludge; 2) dehydrating the sludge, and crushing when the water content is reduced to 10% to obtain powdery sludge;
step five, preparing the decomposed substances: 1) taking decomposed biomass raw materials, a fermentation microbial inoculum and fermentation auxiliary materials according to a dry mass ratio of 505: 10.1: 1.01, uniformly mixing, putting into a fermentation tank, adjusting the initial temperature to 29 ℃ and the humidity to 55%, and carrying out aerobic fermentation for 37 d; 2) turning over once every 3d in the fermentation period, and obtaining decomposed substances with the water content of 34% after the fermentation is finished;
step six, planting soil preparation: 1) taking powdery sludge and decomposed substances, and mixing the powdery sludge and the decomposed substances according to a dry mass ratio of 105: 55, mixing uniformly, and preparing planting soil; 2) and (3) diluting the wood vinegar liquid by 35 times to obtain wood vinegar fertilizer, and spraying the wood vinegar fertilizer to the planting soil to obtain the excellent planting soil of the terminal product.
Example 3:
a method for promoting the desertification of the sand aggregate dehydrated sludge by using wood processing excess materials and biochar thereof comprises the following steps:
step one, wood processing excess material pretreatment: removing non-lignin impurities such as metal, plastic and the like, and drying the impurities until the water content is 9%; partially crushing to obtain a particle size of 1.5cm to obtain a biochar raw material; part of the powder is crushed to the particle size of 0.9mm, and the carbon nitrogen ratio is adjusted to 27 by using 1.4 percent urea solution: 1, obtaining a decomposed material raw material;
step two, preparing the biochar: 1) sending the biochar raw material into a carbonization furnace for temperature-controlled and oxygen-limited pyrolysis for 1.7h to obtain solid biochar, condensing and standing the generated gas, taking the upper layer of pyroligneous liquor for later use, and using the lower layer of tar for preparing chemical products; 2) soaking solid biochar in HCL solution and NaOH solution in sequence, oscillating for 1h, then washing, drying, crushing and screening to obtain modified biochar particles with the particle size of 0.8 mm;
step three, curing agent preparation: taking modified biochar particles, adding curing auxiliary materials of zeolite particles and cationic polyacrylamide, and mixing the modified biochar particles, the zeolite particles and the cationic polyacrylamide according to a dry mass ratio of 10: 1: 2, uniformly mixing to obtain a curing agent;
step four, sand aggregate dehydrated sludge pretreatment: 1) adding a curing agent with the mass of 1.4 percent of the completely dried sludge, fully mixing, and reducing the harm of heavy metals in the sludge to plant growth through the curing and stabilizing effects of the curing agent to obtain muddy sludge; 2) dehydrating the sludge, and crushing when the water content is reduced to 9 percent to obtain powdery sludge;
step five, preparing the decomposed substances: 1) taking decomposed raw materials, a fermentation microbial inoculum and fermentation auxiliary materials according to a dry mass ratio of 500: 10: 1, uniformly mixing, putting into a fermentation tank, adjusting the initial temperature to be 28 degrees and the humidity to be 57 percent, and carrying out aerobic fermentation for 40 days; 2) turning over every 4d in the fermentation period, and obtaining decomposed substances with the water content of 30% after the fermentation is finished;
step six, planting soil preparation: 1) taking powdery sludge and decomposed substances, and mixing the powdery sludge and the decomposed substances according to a dry mass ratio of 100: 50, mixing uniformly, and preparing planting soil; 2) diluting the wood vinegar liquid by 45 times to obtain wood vinegar fertilizer, and spraying the wood vinegar fertilizer to the planting soil to obtain excellent planting soil of a terminal product;
thirdly, application of the planting soil:
directly adding planting soil with the thickness of 10-15 cm to the surface of the soil to be restored, diluting the wood vinegar liquid according to the growth requirement of the plants, and spraying the diluted wood vinegar liquid to the planting soil, so that a soil environment suitable for vegetation growth can be created. When the planting soil is added, the land is trimmed in a proper amount according to the field condition.
Fourthly, the implementation effect of each embodiment on the planting soil is as follows:
the following table 1 is a technical index table of the planting soil prepared in each example, and table 1 simultaneously lists various main functional raw materials with effects aiming at each technical index. In the method for promoting the sandstone aggregate dewatered sludge to be in soil by utilizing the wood processing excess material and the biochar thereof, the sandstone aggregate dewatered sludge macroscopically represents solid powder such as rock powder, fiber and the like, contains various inorganic or heavy metal elements such as silicon, aluminum, iron, calcium and the like, microorganisms and the like, and is a potential soil resource. The wood processing excess material is used for solidifying heavy metal in soil, improving soil structure and fertility and promoting the dehydration of sand aggregate and sludge to be soil by preparing organic carbon and decomposed substances. The obtained excellent planting soil has reasonable structure, high fertilizer efficiency and strong water retention and drought resistance, and the content of various heavy metals is far less than the national landscaping standard.
Table 1 technical index table of planting soil prepared in each example
While some embodiments of the invention have been presented in the detailed description of the invention, it will be appreciated by those skilled in the art that changes could be made to the embodiments herein without departing from the spirit of the invention. The above examples are merely illustrative and should not be taken as limiting the scope of the invention.
Claims (10)
1. The method for promoting the desertification of the sandstone aggregate dehydrated sludge by using wood processing excess materials and biochar thereof is characterized by comprising the following steps:
step one, wood processing excess material pretreatment:
1) removing non-lignin impurities in the excess materials, and drying the excess materials until the water content is less than or equal to 10%;
2) crushing part of the rest materials to the particle size of 1-2cm to obtain a biochar raw material; part of the crushed materials are crushed to the particle size of less than or equal to 2mm, and the carbon-nitrogen ratio is adjusted to 25-30 by using 1.3-1.6% urea solution: 1, obtaining a decomposed material raw material;
step two, preparing the biochar:
1) sending the biochar raw material into a carbonization furnace for temperature-controlled and oxygen-limited pyrolysis to obtain solid biochar, condensing and standing the generated gas, taking the upper layer of pyroligneous liquor for later use, and using the lower layer of tar for preparing chemical products;
2) soaking solid biochar in HCL solution and NaOH solution in sequence, oscillating for 1-2h, then washing, drying, crushing and screening to obtain modified biochar particles;
step three, curing agent preparation:
taking modified biochar particles, adding curing auxiliary materials, namely zeolite particles and cationic polyacrylamide, and mixing the modified biochar particles, the zeolite particles and the cationic polyacrylamide in a dry mass ratio of 9-11: 0.9-1.1: 1.8-2.2, and uniformly mixing to obtain a curing agent;
step four, sand aggregate dehydrated sludge pretreatment:
1) adding a curing agent accounting for 1-1.5% of the mass of the completely dried sludge, fully mixing, and reducing the harm of heavy metals in the sludge to plant growth through the curing and stabilizing effects of the curing agent to obtain muddy sludge;
2) dehydrating the sludge, and crushing when the water content is reduced to 8-10% to obtain powdery sludge;
step five, preparing the decomposed substances:
1) taking decomposed raw materials, a fermentation microbial inoculum and fermentation auxiliary materials according to a dry mass ratio of 495-505: 9.9-10.1: 0.99-1.01, uniformly mixing, putting into a fermentation tank, adjusting the initial temperature to 25-30 ℃ and the humidity to 55-60%, and carrying out aerobic fermentation for 30-40 days;
2) turning once every 3-5 days in the fermentation period, and obtaining decomposed substances with the water content of 30-35% after the fermentation is finished;
step six, planting soil preparation:
1) taking powdery sludge and decomposed substances, and mixing the powdery sludge and the decomposed substances according to a dry mass ratio of 95-105: 45-55, uniformly mixing, and preparing planting soil;
2) and (3) diluting the wood vinegar liquid by 30-50 times to obtain a wood vinegar fertilizer, and spraying the wood vinegar fertilizer to the planting soil to obtain the excellent planting soil of the terminal product.
2. The method for promoting the desertification of the sandstone aggregate dewatered sludge by using the wood processing excess material and the biochar thereof as claimed in claim 1, wherein the method comprises the following steps: heating the temperature-controlled oxygen-limited pyrolysis treatment to 300-400 ℃ at a heating rate of 8-10 ℃/min, keeping the temperature for 1-2 hours, and filling nitrogen as a protective gas during pyrolysis;
and in the second step, the concentrations of the HCL solution and the NaOH solution are both 0.8-1.2 mol/L.
3. The method for promoting the desertification of the sandstone aggregate dewatered sludge by using the wood processing excess material and the biochar thereof as claimed in claim 1, wherein the method comprises the following steps: in the second step, the particle size of the modified biochar particles is less than or equal to 1.0mm, and the specific surface area is 50m2/g～85 m2/g。
4. The method for promoting the desertification of the sandstone aggregate dewatered sludge by using the wood processing excess material and the biochar thereof as claimed in claim 1, wherein the method comprises the following steps: in the third step, the zeolite particles are porous silicate with the pH value of 7.0-7.5 and the particle size of 1.0-1.2 mm.
5. The method for promoting the desertification of the sandstone aggregate dewatered sludge by using the wood processing excess material and the biochar thereof as claimed in claim 1, wherein the method comprises the following steps: in the third step, the cationic polyacrylamide is a water-soluble high-molecular polymer with the molecular weight of 600-1200 ten thousand.
6. The method for promoting the desertification of the sandstone aggregate dewatered sludge by using the wood processing excess material and the biochar thereof as claimed in claim 1, wherein the method comprises the following steps: in the fourth step, the sandstone aggregate dewatered sludge is waste generated by a sandstone aggregate production system, the main component is silicon dioxide, the particle size is less than 0.075mm, and the volume ratio is more than or equal to 85%.
7. The method for promoting the desertification of the sandstone aggregate dewatered sludge by using the wood processing excess material and the biochar thereof as claimed in claim 1, wherein the method comprises the following steps: the fermentation microbial inoculum is compounded by beneficial microorganisms consisting of photosynthetic bacteria, saccharomycetes and lactic acid bacteria and extracellular enzymes thereof, the water content is 20-30%, and the number of effective viable bacteria is more than or equal to 0.30 hundred million/g.
8. The method for promoting the desertification of the sandstone aggregate dewatered sludge by using the wood processing excess material and the biochar thereof as claimed in claim 1, wherein the method comprises the following steps: and fifthly, the fermentation auxiliary materials are ground phosphate rock, potassium sulfate and water-absorbent polymer resin according to a dry mass ratio of 0.9-1.1: 0.9-1.1: 4.5-5.5, and mixing uniformly; the main component of the phosphate rock powder is fluorapatite, and the particle size is 0.05-0.07 mm; the potassium sulfate is water-soluble potassium fertilizer, and the potassium content is more than or equal to 50 percent; the pH value of the water-absorbent polymer resin is 6.8 to 8.0, and the particle diameter is 0.45 to 0.85 mm.
9. The method for promoting the desertification of the sandstone aggregate dewatered sludge by using the wood processing excess material and the biochar thereof as claimed in claim 1, wherein the method comprises the following steps: and fifthly, the index parameters of the decomposed quality are as follows: the pH value is 6.3-6.8, the organic matter content is 42-48%, the total nitrogen content is 2.63-2.87%, the total phosphorus content is 1.24-1.56%, and the total potassium content is 1.16-1.34%.
10. The method for promoting the desertification of the sandstone aggregate dewatered sludge by using the wood processing excess material and the biochar thereof as claimed in claim 1, wherein the method comprises the following steps: and sixthly, index parameters of the excellent planting soil are as follows: the pH value is 6.5-7.2, and the volume weight is 1.15-1.45 g/cm353-57% of porosity, 23-28% of water content and organic matter45-55 g/kg of mass, 2.2-2.5 g/kg of total nitrogen, 35-45 mg/kg of available phosphorus, 140-170 mg/kg of quick-acting potassium, less than or equal to 2.5mg/kg of Cr, less than or equal to 30mg/kg of Cu, less than or equal to 2.0mg/kg of Hg, less than or equal to 8.0mg/kg of Ni and less than or equal to 70mg/kg of Zn.
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