224results about How to "Repair pollution" patented technology

The invention provides a soil improvement type straw compound organic fertilizer and a preparation method of the soil improvement type straw compound organic fertilizer. The soil improvement type straw compound organic fertilizer is prepared from the following raw materials in parts by weight: 30 to 35 parts of rice straw, 25 to 30 parts of animal excrement, 20 to 25 parts of biological charcoal, 10 to 15 parts of soybean meal, 5 to 10 parts of cassava residue, 5 to 10 parts of diatom ooze, 2 to 2.5 parts of plant ash, 2 to 2.5 parts of turfy soil, 2 to 3 parts of zeolite powder, 3 to 4 parts of a microorganism bacterium agent, 2 to 3 parts of sodium benzoate, 2 to 3 parts of ammonium monohydrogen phosphate, 1 to 2 parts of calcium chloride, 1 to 2 parts of amino acid, 1 to 2 parts of starch, 1 to 2 parts of molasses powder and 1 to 2 parts of humic acid. The soil improvement type straw compound organic fertilizer takes plant wastes as raw materials; the quality of soil can be easily improved and the production cost can also be reduced, so that the physicochemical properties of the soil are improved, and the structure of the soil is comprehensively improved, and furthermore, the soil quality has the effects of softness, air permeability, water retention and fertilizer conservation; the aim of producing an environment-friendly high-quality organic fertilizer through preferably selecting heavy metal capable of being passivated, the biological charcoal capable of improving the fertilizer efficiency of the organic fertilizer, and conversion products of organic wastes including the biological humic acid and the like as composting base materials, and optimizing a composting process.

The invention relates to a microbe soil repairing additive and process for preparation. The process for preparation comprises that liquid microbe fertilizer containing photosynthetic bacteria, bacillus, actinomycete and lactic acid bacteria are absorbed to one or a plurality of natural organic fertilizers as grass peat and zeolite powder or the like, to be mixed proportionally. The invention further relates to the application of the microbe soil repairing additive for repairing soil. The invention can lead useful microbe into soil, uses microbe technique to transfer, absorb, degrade, and convert the contaminant in soil, adjust soil pH value, eliminate soil blocking, and restrain soil-borne disease, thereby improving soil structure, to return soil to original ecologic structure. And the viable bacteria group of the invention is planted in plant root, to quickly grow and deeply insert plant root, thereby improving yield, quality and level of agricultural product, as one ideal fertilizer of organic agriculture, with wide application in agriculture continuous development.

The invention discloses a method for preparing NZVI (nano-scale zero-valent iron) from green tea as well as an application of a suspension of the NZVI. The method comprises technological steps as follows: A, preparing a green tea dissolution solution; B, preparing a ferric trichloride solution; C, preparing the GT-NZVI (green tea-NZVI) suspension. The prepared GT-NZVI has the advantages of good suspension stability, simple preparation technology, low cost, environment-friendliness, good stability, high penetrability in an aquifer and capability of quickly and thoroughly removing hexavalent chromium in sewage and underground water.

The invention discloses a method for repairing heavy metal pollution in mine soil and sludge. The method is characterized in that wild garden chrysanthemum is planted in the mine soil and sludge polluted by the heavy metal, the heavy metals accumulated in soil such as Cd, Cu, Pb, Zn, and the like, are absorbed by adopting the cumulation property of the wild garden chrysanthemum to four heavy metals such as Cd, Cu, Pb and Zn, then most of the four metals are transferred to the overground part, thus achieving the purpose of repairing heavy metal pollution in mine soil.

The invention discloses a cadmium (Cd) passivator for acid soil. The Cd passivator is prepared from the following components of rice hull charcoal, lime, hydroxyapatite and hematite. The Cd passivator for the acid soil, which is provided by the invention, can be used for improving the pH (potential of Hydrogen) of soil and decreasing the content of CaCl2 and ethylic acid extraction state Cd, and is used for promoting the conversion of Cd in the soil from a bioavailable state (an ion exchange state) to a potential available state (a carbonate binding state and a ferromanganese oxide binding state) and an unavailable state (a residue state), reaching the purpose of passivating the activity of the Cd, effectively restoring Cd polluted acid soil, promoting the growth of a plant and decreasing the absorption to the Cd of a crop.

The invention discloses a composite microbial inoculum fertilizer. The invention is characterized in that the fertilizer is prepared from the following components in parts by weight: 6-8 parts of composite microbial inoculum, 25-35 parts of potassium sulfate, 40-55 parts of urea, 35-50 parts of calcium superphosphate, 150-175 parts of biomass power plant ash, 300-330 parts of sawdust, 200-250 parts of biological carbon, 100-115 parts of medical stone powder, 120-125 parts of zeolite powder and 7-9 parts of soil conditioner. The effective components of the composite microbial inoculum comprise Bacillus licheniformis, Bacillus pumilus, Bacillus lateraporus, Bacillus megaterium and silicate bacterium. The composite microbial inoculum is added to the product to improve the microflora distribution and microenvironment in soil; and the abundant generated derivatives chelate or block the direct damage of heavy metals to the tobacco to some extent, and have the function of restoring the polluted soil. The soil conditioner contains bowlder which contains abundant microelements beneficial to the human body, and the microelements are absorbed by the crops and converted through the food chain so as to be beneficial to the human body; and meanwhile, the adsorption component can effectively adsorb and solidify toxic heavy metal elements in soil, reduce the heavy metal elements absorbed by the crops, and enhance the crop yield.

The invention provides a five-layer coverage forced reduction in-situ mineralization restorative method, and belongs to the technical field of mine environment ecological restoration. A five-layer structure involved in the method particularly comprises a non-pollution new soil layer, a clay sealing layer, a biomass reduction sealing layer, a main reaction layer and an original tailing layer. The method comprises the steps that organic matter in biomass on the main reaction layer is taken as the reducing agent, arsenic in a high oxidation state is reduced into arsenic in a low oxidation state or in a reduced state under the effect of anaerobic bacteria, and sulphur in a high oxidation state is reduced into sulphur in a reduced state, so that the minerals of realgar, orpiment and the like are formed again; and meanwhile, a large amount of iron is reduced to form iron pyrite, arsenopyrite, pyrrhotite and other minerals with the low solubility, and the heavy metals of Pb<2+>, Zn<2+>, Cu<2+>, Hg<2+>, Cd<2+>, Sb<3+> and the like form galena, blende, copper pyrites, cinnabar, greenockite, stibnite and other sulfide minerals with the extremely low solubility, so that mine heavy metal pollution in-situ mineralization restoration is achieved.

The invention discloses a method for ultrasonically repairing heavy metal contaminated soil. The method comprises at least following steps: preparation of an extracting agent- citric acid solution; mixing of an extracting agent and polluted soil; mechanical oscillation extraction or ultrasonic-assisted extraction for soil; centrifugal separation and filtration of soil after extraction. According to the method, citric acid is selected as the extracting agent, so that the cost is relatively lower, influence on basic physicochemical property of soil is smaller, secondary pollution cannot be caused, the citric acid is an environment-friendly extracting agent, and four heavy metals including cadmium, copper, lead and zinc in the soil can be effectively removed when the extracting agent and ultrasonic waves are jointly applied to repairing of the heavy metal contaminated soil. The method has the characteristics of good removal effect, small extracting agent dosage and short repairing time.

The present invention discloses a compound agent for repairing heavy metal contaminated soil and an application thereof. The compound agent comprises the following components in parts by mass: 30-75 parts of soluble ferric salts and / or ferrous salts, 10-60 parts of calcium-based compounds, 5-20 parts of sodium lignosulfonate and 2-10 parts of an organic sulfur chelating agent. The soluble ferric salts and / or ferrous salts, calcium-based compounds, sodium lignosulfonate, and organic sulfur chelating agent of sodium dimethyl dithiocarbamate, etc. can effectively repair the compound contaminatedsoil by heavy metals of arsenic, cadmium, etc.

The invention discloses soil improvement organic biological fertilizer and a preparation method thereof. The soil improvement organic biological fertilizer comprises the following raw materials in parts by weight: 30 to 35 parts of rice straws, 25 to 30 parts of animal dung, 20 to 25 parts of charcoal, 10 to 15 parts of bean pulp, 5 to 10 parts of diatom ooze, 2 to 2.5 parts of soddy soil, 2 to 3 parts of zeolite powder, 3 to 4 parts of a microbial agent, 2 to 3 parts of sodium benzoate, 2 to 3 parts of monoammonium phosphate, 2 to 3 parts of mugwort, 2 to 2.5 parts of licorice, 1 to 2 parts of calcium chloride, 1 to 2 parts of amino acid, 1 to 2 parts of starch, 1 to 2 parts of molasses powder, and 1 to 2 parts of humic acid. The soil improvement organic biological fertilizer takes plant waste as the raw material, not only is beneficial to improve the soil quality, but also can reduce the production cost, thereby improving the physicochemical property of soil, comprehensively improving the soil structure, and enabling the soil quality to achieve the effects of softness, permeability, moisture holding and fertilizer maintenance, and optimizes the composting process by preferentially selecting organic waste converted products capable of passivating heavy metal and enhancing the fertilizer efficiency of organic fertilizer, such as charcoal, biological humic acid of and the like, as compost base materials, so as to achieve the purpose of producing environmental high-quality organic fertilizer.

The invention discloses a straw composite soil improvement agent which is prepared from, by weight, 30-40 parts of straw juice, 20-30 parts of charcoal, 20-25 parts of polyacrylamide, 10-15 parts of animal waste, 2-3 parts of turfy soil, 2-2.5 parts of plant ash, 2-3 parts of zeolite powder, 2-3 parts of microorganism function bacterium agent, 2-3 parts of sodium benzoate, 2-3 parts of amino acid, 1-2 parts of starch and 1-2 parts of molasses meal.The plant waste is adopted as the raw materials, the soil quality can be improved, and the production cost can be reduced, so that physical and chemical properties of soil are improved, the soil structure is comprehensively improved, the soil achieves the effects of softness, breathability, water retention and fertilizer maintenance, the chemical fertilizer utilization rate is improved, the developed crop root system is promoted, the crop yield is improved, and the product quality is improved.

The invention relates to a biochar-based fertilizer for restoration of heavy metal contamination of arable soil. The biochar-based fertilizer is composed of, by mass, 50% of biochar, 15% of micropowder of water-chilled dreg from a blast furnace, 30% of fresh cow dung and 5% of a composite biological inoculum. As the biochar and the micropowder of water-chilled dreg from the blast furnace undergo strict screening and effective component activation, the pH value of the soil is increased, the granular structure of the soil is improved, adsorption effect on heavy metal elements in the soil is effectively strengthened, and soil heavy metal restoration effect is enhanced; and in the composite composed by the biochar, the micropowder of water-chilled dreg from the blast furnace, the fresh cow dung and the composite biological inoculum according to a certain proportion, the biochar improves adsorption of heavy metals in a soil solution, the micropowder of water-chilled dreg enhances the silicon utilization rate of crops under the action of an activator, the crops prevent and control migration of heavy metals to the bodies of plants while absorbing silicon so as to reduce heavy metal content in the crops, and the biochar and the micropowder of water-chilled dreg have synergistic interaction in controlling of absorption of heavy metal elements in the soil by the crops.

The invention belongs to the technical field of environment pollution treatment, and more specifically relates to a heavy metal-polluted soil repairing agent prepared by attapulgite. The attapulgite-based soil heavy metal repairing agent is obtained by steps of raw ore fragmentation, acidifying treatment, airing screening, roasting and soil heavy metal restoration. According to the attapulgite-based soil heavy metal repairing agent through acidifying and heat modification, attapulgite clay has characteristics of large specific surface area and high porosity amount due to sulfuric acid acidifying treatment of the attapulgite clay, activity and adsorptivity are increased, proportion of soluble heavy metals in the soil can be effectively reduced, soil heavy metal passivation effect can be reached, and soil heavy metal pollution can be remediated.

The invention discloses a use of attapulgite in a soil heavy metal pollution restoration agent. A preparation method of the attapulgite-based soil heavy metal pollution restoration agent comprises the following steps of 1, raw ore treatment: crushing attapulgite ore, 2, acidification treatment: slowly adding 2mol / L of dilute sulphuric acid into the attapulgite ore, carrying out acidification treatment and then carrying out activation, 3, drying in the sun and screening: transporting the acidified attapulgite clay to a cement place, carrying out drying in the sun until water content is less than 14%, carrying out crushing and carrying out screening by a vibrating screen, and 4, roasting and packaging: inputting the screened powder into a roasting furnace, carrying out roasting and carrying out cooling and packaging so that the attapulgite-based soil heavy metal pollution restoration agent is prepared. The attapulgite clay subjected to sulfuric acid acidification has the characteristics of large specific surface area and high amount of porosity, has high activity and adsorptivity, can reduce a ratio of liquid heavy metal in the soil and realizes soil heavy metal passivation and heavy metal-polluted soil restoration.

The invention provides a soil heavy metal passivation agent for remediation of soil contaminated by heavy metals and losing agricultural, industrial and commercial uses and the like. The method includes 1, contaminated soil mining; 2, medicament mixing; 3, soil backfilling; and 4, reuse of the soil. The chemical agent formed by mixing a sulfide, inorganic phosphorus and an alkali undergoes a chemical reaction with the heavy metals, and the heavy metals can be transformed into long-term and stable existing heavy metal sulfides. In addition, low-cost fly ash is added in the soil, so that the heavy metals are stabilized. With the use of the above method, the heavy metals in the soil are reduced to migrate to enter a plant system. The method has the advantages of high efficiency, low cost, strong stability, long-term effectivity with once use, no causing of secondary pollution and the like. The soil heavy metal passivation agent has the characteristics of low cost, simple process, no pollution and good governance effect.

The invention discloses a soil conditioner for degrading pesticides in soil with microorganisms. The soil conditioner is prepared from, by mass, 100-200 parts of organic fermented manure, 3-5 parts of trace fertilizer, 2-5 parts of bentonite, 5-7 parts of phosphate rock powder, 3-5 parts of amino acid and 0.1-1 part of microbial flora, wherein the microbial flora is composed of pseudomonas fluorescens, rhodopseudomonas palustris, alcaligenes faecalis, pseudomonas putida, bacillus licheniformis, spherical lysine bacillus, bacillus subtilis and bacillus cereus. The soil conditioner is prepared by compounding various microbial strains, the organic fermented manure, the trace fertilizer, amino acid, the bentonite and the phosphate rock powder, and can degrade the chemical pesticides in the soil, such as organic phosphorus pesticides, heterocyclic pesticides, phenol pesticides and aromatic pesticides, and remedy the pesticide-contaminated soil.

The invention provides a fertilizer for cultivation of tobacco. The fertilizer consists of the components by weight as follows: 0.5-1.5 parts of a composite microbial agent, 3-7 parts of an activating agent, 3-7 parts of binder, and 86-92 parts of nitrogen, phosphorus and potassium fertilizer. The effective components of the composite microbial agent are Bacillus licheniformis, Bacillus pumilus, Brevibacillus laterosporus, Bacillus megatherium and Silicate bacteria. The invention further provides a preparation method and an application of the fertilizer. The product provided by the invention can remarkably improve crumb-structure of soil for cultivation of tobacco, and microflora distribution and micro-environment of the soil. A plenty of derivatives are generated, thereby chelating or blocking damage of heavy metals, and absorption and assimilation of tobacco to nutrient elements are improved, the drought resisting and disease resisting abilities of tobacco are enhanced, damage of diseases and insects caused by continuous cropping of tobacco in successive years are effectively prevented, and in particular, tobacco mosaic virus and brown spot disease are specially prevented and treated. According to the invention, the raw materials are low in cost and easy to obtain and the preparation and using methods are simple and easy to operate.

The invention relates to a rice-straw antibacterial soil amendment. The rice-straw antibacterial soil amendment is prepared from the following raw materials in parts by weight: 30-35 parts of rice straws, 20-30 parts of biochar, 10-15 parts of bean meal, 5-10 parts of cassava residue, 10-15 parts of chicken manure, 5-10 parts of diatom ooze, 2-3 parts of artemisia argyi, 2-2.5 parts of glycyrrhiza uralensis, 2-2.5 parts of pine needles, 2-3 parts of tea tree oil, 2-2.5 parts of plant ash, 2-3 parts of zeolite powder, 2-3 parts of microbial functional bacterium agent, 2-3 parts of sodium benzoate, 1-2 parts of amino acid, 1-2 parts of starch and 1-2 parts of molasses powder. According to the rice-straw antibacterial soil amendment, plant wastes are adopted as the raw materials, so that the improvement on quality of soil is facilitated, the production cost can be reduced; the physicochemical properties of the soil are improved, the structure of the soil is comprehensively improved, and the texture of the soil can achieve soft, air-permeable, water-retention and fertilizer retention effects; and the rice-straw antibacterial soil amendment plays roles in sterilizing, weeding, increasing the utilization ratio of chemical fertilizers, promoting the root system development of crops, increasing crop yield and improving product quality.

The invention relates to a high-cadmium-adsorption filamentous fungus Paecilomyces lilacinus XLA, and a preparation method and an application thereof. The preparation method comprises the following steps: 1, weighing a pot experiment soil sample used for heavy metal restoration and having a content of heavy metal cadmium of 50mg / Kg, adding to sterile water with glass beads, oscillating on a constant temperature shaking table, allowing an obtained solution to stand, taking an obtained supernatant, and carrying out serial dilution; 2, coating a Martin flat containing 60mM of cadmium with different dilution rates of dilutions, allowing the obtained flat to stand for a moment, inverting on a constant temperature culturing box, and culturing; 3, carrying out streaking purification of single colonies growing on the flat, coating the Martin flat with the obtained single colonies, and culturing; 4, carrying out separating screening to obtain the Paecilomyces lilacinus XLA stably resisting cadmium, and preserving on a PDA inclined plane for later use. The Paecilomyces lilacinus XLA is preserved and has a preservation number of CCTCC NO:M2012135. Viable and non-viable organism of the XLA can efficiently adsorb and remove the heavy metal cadmium in heavy metal sewage, so the XLA has the advantages of low cost and simple technology, and has an efficient restoration potential of heavy metal polluted soil and water.

The invention relates to a straw composite antimicrobial soil conditioner which is prepared from the following raw materials in parts by weight: 30-40 parts of straw juice, 20-30 parts of biochar, 20-25 parts of polyacrylamide, 10-15 parts of animal manure, 2-3 parts of turfy soil, 2-2.5 parts of plant ash, 2-3 parts of zeolite powder, 2-3 parts of microbial functional microbial inoculant, 2-3 parts of chitosan, 2-3 parts of mugwort extract, 2-3 parts of sodium benzoate, 2-3 parts of amino acid, 1-2 parts of starch and 1-2 parts of molasses powder. The plant wastes are used as the raw materials, thereby being beneficial to enhancing the soil quality, lowering the production cost and further improving the physicochemical properties of the soil. The soil structure is comprehensively improved, so that the soil is loose and air-permeable and has the effects of water retention and fertilizer retention, thereby enhancing the utilization ratio of the chemical fertilizer. The straw composite antimicrobial soil conditioner has the effects of killing bacteria, eliminating weed, promoting the development of the crop root system, enhancing the crop yield and improving the product quality.

The invention relates to a functional fertilizer for regulating a micro-ecological environment of soil. 50-80% of nanometer dolomite dust, 5%-15% of sugar alcohol, 5%-15% of potassium metasilicate, 5-10% of charcoal and 5%-10% of biochemical potassium fulvic acid are utilized to prepare the functional fertilizer according to the following steps: A) preparing raw materials; B) preparing nanometer dolomite dust; C) preparing a sugar alcohol water solution; D) chelating nutrients; E) pelleting for the first time; F) pelleting for the second time; G) drying. The functional fertilizer can be used for improving soil hardening, regulating soil PH and regulating soil acidification; the functional fertilizer can be used for supplementing organic matters and various medium trace elements for the soil, regulating the saturability of soil base, cation exchange capacity and nutrient balance, reducing aluminum and manganese toxicity damage and improving soil salinization; the functional fertilizer can be used for absorbing passivated heavy metal and repairing soil heavy metal pollution; the functional fertilizer also is capable of creating an excellent living environment for soil beneficial microorganisms, boosting the growth and reproduction of the microorganisms and recovering the excellent micro-ecological environment of soil.

The invention discloses a method for continuously and safely producing peppers using low-cadmium pepper / sedum plumbizincicola strip intercropping. According to the method, low-cadmium peppers and sedum plumbizincicola are planted in a strip intercropping mode at the same compartment face. By the adoption of the method, not only is it ensured that the cadmium content of pepper fruits does not exceed 0.05 mg / kg which is stipulated in the national food cadmium content limit standard (GB2762-2012), but also it is ensured that cadmium-contaminated soil is restored while agricultural work is not terminated, and the continuous and safe production of the peppers is achieved. The method for continuously and safely producing the peppers using the low-cadmium pepper / sedum plumbizincicola strip intercropping has the advantages of being low in investment, low in workload, not high in technical requirement and the like.

The invention discloses application of malva to remediation of cadmium and lead pollution of mine soil and sludge, which is characterized by planting malva in the mine soil or sludge polluted by heavy metals. The invention has the following beneficial effects: the malva is planted in the mine soil or sludge by utilizing the enrichment characteristics of malva toward cadmium, lead and other heavy metals, and can absorb the accumulated heavy metals such as cadmium, lead, etc, and most malva is transported above the ground to achieve the aim of remediating heavy metal pollution of mine soil and sludge; the malva dispenses with special management in the growth process, thus the cost is lower and the operability is strong; and meanwhile, the invention develops new plant resource varieties for remediation of plants polluted by heavy metals in the mine oil and sludge and brings new progress and development space for deep development of plant remediation technology.

The invention discloses a biological active fertilizer taking the branches and fallen leaves of poplar as raw materials and an application method thereof. The effective component of the biological active fertilizer takes the branches and fallen leaf crushed substances of the poplar and vermiculite as main raw materials. The preparation method comprises the following steps of: mixing the branches and fallen leaf crushed substances of the poplar and the vermiculite according to the volume ratio of 2:1, and then mixing into MMN liquid culture medium; inoculating multiple ectomycorrhizal fungus, and then uniformly mixing with biological active carbon, a biological organic fertilizer, a water retention agent and a biological active growth-promoting component under an aseptic condition to obtain a solid biological mycorrhiza formulation. Compared with the traditional biological fertilizer, the biological active fertilizer disclosed by the invention can obviously enhance the absorption of multiple nutrient elements of a plant root system, promote the growth of a seedling, enhance the tolerance and soil-borne diseases and insect pests resistant capacity of a plant on a drought environment, a saline-alkali environment, an impoverished environment, and the like, activate the beneficial microbes contained in rhizosphere soil, enhance the photosynthesis, enhance the carbon sequestration capacity of the plant, optimize the seedling quality and increase the market value.

The invention provides a preparation method of a selenium-rich humic acid water soluble fertilizer. The method is characterized by comprising the following steps: 1) preparing organic selenium; 2) acidizing humic acid; 3) stirring; 4) chelating; 5) concentrating. The method provided by the invention is simple to operate and easy to implement. According to the method, the prepared water soluble fertilizer can be used for lowering the residual quantity of heavy metals and pesticides in agricultural products so as to guarantee the quality safety of the agricultural products, and can improve the yield of crops at the same time, thereby conforming to the standard of selenium-rich agricultural products in China. As a result, the prepared water soluble fertilizer has a wide market prospect.

The invention belongs to the technical field of environmental remediation and particularly relates to a biological ventilation enhanced in-situ multi-phase extraction system. The biological ventilation enhanced in-situ multi-phase extraction system comprises a biological ventilation unit which uniformly injects air into a contaminated soil area and a nutrient solution injection unit which uniformly injects a nutrient solution into the contaminated soil area. The biological ventilation enhanced in-situ multi-phase extraction system further comprises a contaminant double-pump extraction unit, agroundwater treatment unit, an unsaturated zone gas treatment unit and extraction wells. The extraction wells are arranged under the ground of the contaminated soil area. The contaminant double-pump extraction unit is arranged on the ground of the contaminated soil area. The contaminant double-pump extraction unit is connected with the groundwater treatment unit and the unsaturated zone gas treatment unit. According to the biological ventilation enhanced in-situ multi-phase extraction system, the efficiency and effect of in-situ multi-phase extraction remediation of the soil and groundwater contaminated by organic matter can be enhanced through biological ventilation, and remediation of the contaminated soil and remediation of groundwater are achieved at the same time by separately extracting the groundwater and soil gas through the double-pump system.

The invention discloses a stable repairing agent for improving heavy metal soil. The stable repairing agent is prepared by compounding solidified microorganism slow-release particles, modified biomass charcoal and a chelating adsorbent, wherein the solidified microorganism slow-release particles are obtained by mixing and reacting an aqueous solution containing montmorillonite, diatomite and polyvinyl alcohol with an aqueous solution containing corn starch, a microbial agent and hydroxypropyl chitosan, the modified biomass charcoal is obtained by performing soaking pretreatment on organic matter powder through potassium chloride and magnesium chloride solutions and then performing carbonization, and the chelating adsorbent is prepared by grafting organosilane and tyrosine on the surface of hydroxyapatite. The invention further discloses a preparation method of the stable repairing agent and application of the stable repairing agent to improvement of heavy metal soil. According to the invention, natural porous mineral powder and organic matter materials are used as matrixes, the soil environment and plant survival conditions are improved, the metabolism function of microorganisms and plants is enhanced, heavy metal is solidified, stabilized and effectively reduced, and stable remediation of heavy metal soil is achieved.

The invention belongs to the technical field of soil treatment, and particularly relates to a preparation method of a soil heavy metal compound passivator. The preparation method of the invention comprises the steps of taking attapulgite as a raw material and using thioglycolic acid modified attapulgite as a carrier of fertilizer to improve the physical properties of the fertilizer, reduce the nutrient loss of the fertilizer, improve the utilization rate of the fertilizer, enhance the buffering performance of soil, and adsorb harmful elements in the soil, and repair soil heavy metal pollution; then crushing and sieving ground phosphate rock, and mixing with dried and crushed oyster mushroom spawn culture media waste to obtain slow-release compound fertilizer; finally mixing a homemade fulvic acid solution, the modified attapulgite powder and the compound fertilizer for granulation, so as to obtain the soil heavy metal compound passivator. The heavy metal compound passivator prepared by the preparation method of the invention cannot change the physical properties of the soil and can improve the fertility of the soil, meanwhile, the passivation effect is long-lasting and a broad application prospect is realized.

The invention belongs to the technical field of microbes, and particularly relates to pantoea ananatis promoting dissolution of ground phosphate rock and applications thereof. The pantoea ananatis HCR2 is deposited in the Guangdong Culture Collection Center on January 16, 2017. The accession number is GDMCC No:60140. The pantoea ananatis can effectively dissolve ground phosphate rock, and can promote a function of the ground phosphate rock for immobilizing lead in soil or solutions.

The invention discloses a method for restoring cadmium contaminated soil, which is to plant nut grass in cadmium contaminated soil. The invention adopts the specific technical scheme that the method for restoring cadmium contaminated soil is characterized by comprising the following steps: A, directly planting nut grass in cadmium contaminated soil or directly sowing seeds of nut grass for growing; and B, remaining the stubble of the planted nut grass and reaping the overground part, or after planting for years, reclaiming the whole plant and then sowing seeds or raising seedlings through cuttings. The method utilizes the principle that the root of nut grass has very strong enrichment to cadmium; and when nut grass is planted in soil, cadmium is absorbed by the root and is transferred to be stored in the overground part, so that the purpose of restoring cadmium contaminated soil can be achieved, and meanwhile, cadmium is prevented from entering the food chain and harming the health of human. Nut grass is a perennial herb, is vigorous in life force, and does not require special management during the growing process; besides, the cost is low, and the operability is strong.