92results about How to "Reduce the effective content" patented technology

The invention discloses a restoration agent for lowering cadmium/lead effective state content in soil, which is composed of quicklime, calcium sulfate, wood charcoal, iron chloride and water, wherein the weight ratio of the quicklime, calcium sulfate, wood charcoal and iron chloride is (1-2):(1-2):(1-2):(0.5-1), and the water accounts for 30-45 wt% of the soil. The restoration agent can be used for treating heavily polluted soil; and common chemical passivators can only restore lightly polluted soil, and do not have obvious effect on heavy pollution. The restoration agent can be used for treating both acidic soil and neutral soil. The restoration agent has high remediation efficiency for cadmium polluted soil; the reaction mechanisms relate to chemical precipitation and physical adsorption; and when one action fails due to change of the outside conditions, the other action can perform the guarantee function. The restoration agent has certain control actions on the lead effective state content in the polluted soil.

The invention discloses a fixed enrichment method for city life compost heavy metals through modified nanocarbon. The fixed enrichment method comprises the following steps: modifying the modified nanocarbon with the grain diameter of 20-70nm before being applied so as to obtain various types of modified nanocarbon; then sealing a layer of cotton cloth and a nylon net at the lower end of a PVC (polyvinyl chloride) tube, uniformly and proportionally mixing garbage compost with the modified nanocarbon, wherein each tube is filled with150g of a mixed material; setting the temperature during experiments to be 19-27 DEG C and the relative humidity to be 60% to 72%, and supplementing water for the compost every day, so that the content of water of the compost reaches about 70% of field moisture capacity; sampling 45d for cultivation later, and carrying out morphological analysis on the heavy metals, wherein the addition of the modified nanocarbon is 1-5%(w/w) of the weight of the garbage compost. Experimental results show that the modified nanocarbon is added so that the contents of the heavy metals in a residual form are increased, the conversion of the compost heavy metals from a plant easily-absorbed state to a difficultly-absorbed state is promoted, and the method provides a basis for the application of the modified nanocarbon on passivation and plant enrichment of the heavy metals in garbage compost.

The invention discloses a cross-linked polymer system heat stabilizer for water shutoff and profile control, and a preparation method and application thereof, wherein the heat stabilizer is composed of the following components in parts by weight: 2-8 parts of sodium thiosulfate, 30-50 parts of polyethylene glycol, 10-30 parts of urea, 1-5 parts of formaldehyde and 800-1200 parts of de-ionized water. All of the components are evenly mixed to obtain the heat stabilizer which is used as a cross-linked polymer system common in water shutoff and profile control or profile control and displacement of the oil field; and the cross-linked polymer system is composed of polyacrylamide aqueous solution and a phenolic resin cross-linking agent or organic chromium cross-linking agent. The thiourea or sodium thiosulfate of the heat stabilizer provided by the invention serves as the deoxidant, the polyethylene glycol or the urea serves as the complexing stabilizer, and the formaldehyde serves as the complexing stabilizer and the bactericide; the method for preparing the cross-linked polymer system heat stabilizer is simple and the use cost is also low; therefore, the strength and the stability of the cross-linked system both can be well improved.

The invention relates to a preparation method of more stable vitamin A microcapsules, comprising the following steps of: firstly, preparing a vitamin A oil solution containing an antioxidant from vitamin A and the antioxidant in the absence of oxygen, adding chitosan and stirring evenly, after stirring fully, filtering and removing the chitosan to obtain the vitamin A oil solution; adding octenyl succinic acid modified starch to purified water deaerated by a thermal spray deaerator, heating for dissolution; mixing the prepared octenyl succinic acid modified starch solution and the vitamin A oil solution in a certain proportion, emulsifying quickly by an on-line emulsifying machine, and instantly cooling by a cooler; and performing hot air spray drying on the emulsion to obtain stable vitamin A microcapsules. The storage life of the product prepared in the invention reaches two years.

The invention discloses a polypeptide for inhibiting aggregation and toxicity of beta amyloid protein (A beta) or a variant of the polypeptide with polypeptide functions. The polypeptide has a strong binding force with the A beta protein, so that the effective content of a beta structure can be greatly reduced when A beta achieves an aggregation balanced state, the secondary structure of A beta in a solution environment can be changed, the content of the beta structure can be greatly reduced, even the beta structure disappears, the toxicity of A beta to SH-SY5Y cells can be remarkably reduced when the concentration of the polypeptide is extremely low, and generation of A beta-induced active oxygen can be greatly inhibited. Therefore, a feasible method is provided to treatment of Alzheimer disease caused by beta amyloid protein, and thought and reference standard can be provided to discovery of polypeptide pilot compounds for treatment of amyloid protein related diseases.

The invention discloses a method for hindering the absorption of heavy metal by a plant. Modifying agent is applied to soil; the modifying agent is the combination of red mud, apatite and selenium; and the dosage of the red mud, the apatite and the selenium is as follows: 5-100g of red mud, 5-100g of apatite and 0.5-1mg of selenium are applied to 1kg of soil. According to the application of the combined modifying agent, the effective state of heavy metals in the soil can be lowered to achieve a purpose of fixedly precipitating the heavy metals so as to greatly lower the content of the heavy metals, such as cadmium, copper, lead, zinc and arsenic in plants, the plant biomass can be increased, and a technical guarantee is provided for the grain production safety of a heavy metal contaminated region.

The invention discloses a heavy metal passivator for reducing the bio-availability of cadmium in soil. The heavy metal passivator is prepared by mixing the following components in percentage by weight: 70 to 90 percent of biochar and 10 to 30 percent of modified sodium alginate. The heavy metal passivator disclosed by the invention not only has a function of passivating the heavy metal in the soil in situ, but also is capable of improving the soil structure and increasing the soil porosity, the pH (Potential of Hydrogen) of the soil is increased to a larger extent, and the function of repairing acidified soil is also obtained.

The invention discloses a sludge treatment method and an agricultural sludge biochar acquired by adopting the method. The agricultural sludge biochar is mainly prepared through low-temperature oxygen-limited decomposition of organic and inorganic antidotes and citizen sludge which are uniformly mixed, and the antidotes accounts for 3%-20% of the amount of dry matter of the citizen sludge. With the adoption of the sludge treatment method, activity and total amount of heavy metal in a carbonized product can be effectively reduced, pathogenic bacteria are killed, organic pollutants such as polycyclic aromatic hydrocarbon and the like are eliminated, and nutrients can be maintained to the greatest extent, so that the product is applicable to the plantation fields such as agriculture, forestry and the like.

Belonging to the technical field of contaminated soil remediation, the invention particularly relates to an improvement method of extremely acidified mine soil. The method utilizes an improving agentand a microbial agent to change the microbial community structure of soil, especially reduce the relative abundance of iron-sulfur oxidation acid production microorganisms and inhibit metal sulfide from oxidizing and producing acid. The improving agent can be utilized for adsorption, chelation, complexing and immobilization of heavy metal ions and reduction of the biological toxicity, thus reducing the diffusion and leakage of heavy metal ions to surrounding soil or water. The improvement method provided by the invention has the advantages of low investment cost, good acidification control andheavy metal stabilization effect, substantial increase of nutrient content, no destruction of the soil structure, and easy implementation.

The invention discloses a method for reducing the bioavailability of soil with combined heavy metal pollution. The method comprises the following steps: subjecting the soil with combined heavy metal pollution to air drying, sieving and preservation; with agricultural and forestry residues as raw materials, preparing biochar particles, and carrying out crushing, screening, air drying or stoving, and preservation; mixing the screened dried biochar particles and the soil with combined heavy metal pollution in a weight ratio of 1: 20 to 1: 100 under stirring, adding distilled water to allow the water content of the obtained mixture to reach 50 to 70% of field moisture capacity, and subjecting the mixture to standing for 5 to 7 days to allow the mixture to be fully decomposed so as to prepare achar-soil mixture with combined heavy metal pollution; and transplanting tobacco seedlings into the char-soil mixture by using a well cellar seedling transplanting method, uniformly filling the wellcellar with the mixture and allowing the growing points of the tobacco seedlings to main exposed. The method provided by the invention substantially reduces the available contents of Cd and Pb in thesoil with combined heavy metal pollution and lower absorption and enrichment of the heavy metals Cd and Pb by the roots, stems and leaves of crops; and the method has the advantages of low cost, highefficiency, simple operation and easy promotion and application.

The invention discloses a soil conditioner and a preparation method thereof. The soil conditioner comprises 40%-80% of charcoal powder, 0-30% of zeolite powder, 0-30% of lime powder and 10%-20% of montmorillonite powder.

The invention relates to aluminum alloy and provides high-strength aluminum alloy with the tensile strength of more than 700MPa and a preparation method thereof. The high-strength aluminum alloy comprises the following raw materials in percentage by weight: 0.10%-0.14% of Fe, 0.03%-0.04% of Mn, 0.02%-0.04% of Si, 0.01%-0.06% of Ti, 0.03%-0.09% of B, 2.2%-2.9% of Zn, 0.9%-1.0% of Mg, 1.1%-1.3% of Cu, 0.5%-1.0% of Ce, 0.1%-0.4% of Sc and the balance of Al.

The invention discloses a method for repairing soil contaminated by uranium tailings uranium and associated heavy metal by passivation of phosphorous-containing compounds. The method for repairing thesoil contaminated by uranium tailings uranium and associated heavy metal by passivation of the phosphorous-containing compounds comprises the steps that step one, phosphorous-containing compounds screening is carried out; step two, uranium tailings contaminated soil uranium and associated heavy metal passivation treatment is carried out; and step three, plants with uranium and associated heavy metal tolerance, small amount of enrichment and mainly enrichment in roots are screened and utilized, the plants are cultivated according to various varieties planting requirements, contents of a uranium and associated heavy metal effective state in uranium and associated heavy metal low concentration contaminated areas can be reduced, and agricultural products with edible safety are harvested and better earnings are obtained.

The invention provides a hydroxyapatite/activated carbon efficient soil conditioner and application thereof, and relates to the technical field of soil conditioners. The efficient soil conditioner isprepared from the following raw materials in parts by weight: 20-28 parts of hydroxyapatite powder, 10-15 parts of rice hull activated carbon, 7-12 parts of coconut shell activated carbon, 7-13 partsof plant ash, 6-11 parts of straw, 10-15 parts of tomato pomace, 6-10 parts of animal waste, 0.2-0.3 part of compound microbial agent and 5-11 parts of dolomite. The soil conditioner is green and environment-friendly and low in cost and can effectively reduce the effective state content of each heavy metal in soil and improves the pH value of acidic soil and is good in fertilizer retention and moisture retention effects and high in organic matter content and greatly improves the soil structure and ecological environment of the acidic soil and has a good effect on improving the acidic soil andrepairing the acidic heavy metal contaminated soil.

The invention discloses a method using catalytic oxidation of sulfur dioxide tail gas for a PH adjustment agent of phosphate rock ore dressing. According to the method, soluble iron (III), germanium (IV) and other metal ions in raw phosphate rock pulp are used as catalysts, copper (II) ions play a synergistic effect, a trace buffer is added; countercurrent contact, in a dynamic wave desulphurization tower, with the sulfur dioxide tail gas out from an absorption tower is realized, and after sulfur dioxide is absorbed, a sulfuric acid solution is formed for decomposition of the phosphate rock pulp; phosphoric acid formed by the decomposition of the phosphate rock pulp can be used as the PH adjustment agent in phosphate rock ore flotation selection, and a mineralization coupling technology of phosphorus chemical industry and phosphate rock ore dressing can be achieved. The tail gas processed by desulphurization can reach an emission standard of less than or equal to 400mg/m<3> of tail gas of the new national standard. The purification method of the sulfur dioxide tail gas in sulfuric acid production has the advantages of simple process and strong applicability, can achieve the mineralization coupling technology of phosphorus chemical industry and phosphate rock ore dressing, and has great significance in the points of view of both resources and environmental protection.

The invention belongs to the technical field of soil remediation agents, and discloses a heavy metal contaminated soil remediation agent. The heavy metal contaminated soil remediation agent comprises,by weight, 30-50 parts of modified fly ash, 20-30 parts of modified kaolinite, 10-20 parts of oxidized nanometer carbon black, 10-15 parts of biochemical fulvic acid, 3-8 parts of sodium thiosulfateand 5-10 parts of a microbial agent. The invention also discloses a preparation method of the heavy metal contaminated soil remediation agent. The preparation method comprises the following steps: (1)uniformly mixing weighed modified fly ash, modified kaolinite, oxidized nanometer carbon black, biochemical fulvic acid and sodium thiosulfate, feeding the obtained mixture into a granulator, addinga proper amount of water vapor, granulating, and drying for later use; and (2) adding the microbial agent into obtained particles, uniformly mixing, feeding the obtained mixture into a granulator, adding a proper amount of water vapor, granulating, and drying to obtain the soil remediation agent. An inorganic passivator and microorganisms are combined for use, and heavy metal ions are rapidly andefficiently fixed through the inorganic passivator; and the microbial agent is added, so that the leaching concentration of heavy metals is reduced, and the heavy metal contaminated soil is improved.

The invention discloses a soil remediation method based on modified attapulgite clay. The method comprises the following steps of S1, sampling attapulgite clay raw materials, smashing the attapulgiteclay through a smashing device, and then, adding diluted ammonium hydroxide, a dioctyl sebacate solution, a carbon base material and a remediation solution, wherein the addition mass percentage of diluted ammonium hydroxide is 0.8-1.0%, the addition mass percentage of the dioctyl sebacate solution is 1.0-1.2%, the addition mass percentage of the carbon base material is 0.8-1.5%, and the addition mass percentage of the remediation solution is 0.2-0.3%. The invention relates to the technical field of soil remediation. According to the soil remediation method based on modified attapulgite clay, the modified attapulgite clay is adopted as a soil remediation agent, a layer which is high in adsorption capability, high in adoration rate and capable of effectively adsorbing heavy metal ions in soil can be formed below a contaminated soil layer, the soil remediation solution is sprayed, plants grow to have deep roots and luxuriant leaves, chlorophyll is enhanced, nutrients are abundant, and normal juice and normal taste are recovered; soil contaminations are reduced, and the method is low in carbon and environmentally friendly and no water or fertilizer soil is lost.

The invention provides a soil passivator, a preparation method thereof and application of the soil passivator in farmland heavy metal pollution remediation, and relates to farmland heavy metal pollution soil remediation. The passivator is prepared from the following raw materials: natural zeolite, ferrous sulfate and brucite, the use amount of the ferrous sulfate is 10%-50% of the mass of the natural zeolite, the use amount of the brucite is 10%-40% of the mass of the natural zeolite, and the passivator can be obtained by uniformly mixing all the components. The passivator nt is simple in preparation method, natural in raw material source, free of secondary pollution to soil and convenient to construct, farmland fallow is not needed during application, the passivator is applied in leisureseasons, and normal agricultural planting is not affected; the passivator provided by the invention is low in price and obvious in remediation effect, can effectively reduce the content of heavy metals in crops and the content of available heavy metals in soil, and has a good application prospect in the aspect of remediation of large-scale heavy metal contaminated farmlands.