76 results about "Metal contaminated soils" patented technology

The invention belongs to the technical field of soil remediation, and in particular relates to a soil remediation agent for treating heavy metal pollution and a production method of the soil remediation agent. The soil remediation agent consists of the following raw materials in percentage by weight: 35 to 65 percent of active molasses yeast waste water chelate powder, 5 to 20 percent of silicon dioxide, 5 to 15 percent of calcium oxide, 1 to 10 percent of magnesium oxide, 0.3 to 10 percent of ammonium persulfate, 5 to 28 percent of humic acid and derivatives thereof, 0.1 to 15 percent of microcapsule inoculants, 0.1 to 5 percent of a macromolecular water-retaining agent, 0.1 to 5 percent of a heavy metal passivant, 1 to 5 percent of auxiliary agents and 1 to 45 percent of inorganic mixed fertilizer. Compared with the prior art, the soil remediation agent provided by the invention has the advantages that the organic waste liquid of yeast industry serves as one of the main raw material, so the environmental pollution caused by the organic waste liquid is reduced and the cost of the soil remediation agent is reduced; precipitation and biological action are combined, so a good effect of treating the heavy metal pollution is achieved; the main components also comprise organic fertilizer and inorganic fertilizer, so the heavy metal pollution can be effectively treated, production and income of crops are increased, continuous cropping resistance of the crops is achieved, and potential application and popularization values are achieved.

The invention relates to the technical field of contaminated soil remediation treatment, in particular to a metal contaminated soil remediation device which comprises a movable bottom frame, a soil scarifying part, a soil collecting and conveying mechanism, a soil spraying barrel assembly, a soil block crushing mechanism and a soil spraying mechanism. The metal contaminated soil remediation devicehas the beneficial technical effects that soil blocks and crushed soil can be screened, the crushed soil makes direct contact with a spraying agent and then is discharged, large soil blocks are ground into crushed soil and then make contact with the spraying agent and then are discharged, a spray head conducts rotary spraying, full contact with soil can be performed, and the remediation effect isguaranteed. The soil scarifying part is arranged at one end of the movable bottom frame and is in transmission connection with the movable bottom frame, the soil collecting and conveying mechanism isarranged on the movable bottom frame, one end of the soil collecting and conveying mechanism is located on one side of the soil scarifying part, and the other end of the soil collecting and conveyingmechanism is located above the soil spraying barrel assembly. The soil spraying cylinder assembly is arranged at the other end of the movable bottom frame, and the soil block crushing mechanism is arranged above the soil spraying cylinder assembly.

The invention discloses a planting method of jute in heavy-metal contaminated soil. The method comprises the following steps of: A, preparing soil and building a field, and applying passivator to reduce activity of heavy metal in the soil; B, selecting a specific jute variety with strong heavy metal contamination resistance, sowing in an enough amount at proper time to guarantee full seedlings; C, determining appropriate close planting, thinning/finally singlings in good time, and reserving enough basic seedlings; and D, intertilling/weeding in time, rationally topdressing/irrigating to culture effective strong plants; E, reinforcing prevention and control of diseases and insect pests to realize high yield of jute. By the jute planting method, the average yields of raw stems in light, medium and heavy contaminated jute fields are respectively 181.0+/-16.4, 174.9+/-15.7 and 158.5+/-15.3kg/mu, which reaches the high-yield level of the jute growing area in South China; and the content of heavy metal in raw jute can be controlled in a range of related standard limit, so that agricultural safety and effective utilization of heavy metal contaminated soil can be realized. The method is simple in technology and practical, and has wide application prospect in broad heavy metal contaminated areas.

The invention relates to a stabilizing restoration method for heavy-metal contaminated soil. The method is characterized in that Ca-Al hydrotalcite like compounds are used as restoring agents. The method comprises the specific steps of firstly, soil collecting: selecting contaminated soil samples, collecting and sending the contaminated soil to a laboratory, and detecting the heavy metal concentration and basic physicochemical properties of the contaminated soil; and secondly, stabilization experiment: weighing the contaminated soil, putting the contaminated soil into a 500ml beaker, adding Ca-Al like soil restoration agents of different mass percentages, adding deionized water of the corresponding volume in accordance with 60% of the soil maximum water-holding capacity, stirring the mixture uniformly, stabilizing the mixture under the natural condition, and taking samples on the second day, the seventh day and the fourteenth day after stabilization for leaching experiments. The stabilizing restoration method for heavy-metal contaminated soil has the advantages of being short in treatment time, wide in application range and low in cost.

The invention discloses application of Jujun grass on repairing soil with heavy mental cadmium pollution. The application method comprises the steps of; directly transplanting cultivated pennisetum plant Jujun grass seedlings with the heights of 10-13cm in heavy metal cadmium-polluted soil every spring, wherein the plant spacing is 25cm and the row spacing is 30cm; applying a base fertilizer, wherein the base fertilizer amount per mu is as follows: 10-12kg of pure nitrogen, 7-8kg of phosphorus pentoxide and 7-7.5kg of potassium oxide; watering in the plant cultivation period and topdressing every 60 days due to the demand of growing o f the large Jujun grass in the later period, wherein the watering amount is 7-8.5kg per mu and the topdressing amount is 4-5kg of the pure nitrogen per mu; and after the Jujun grass grows for 100-150 days, harvesting the overground part of the Jujun grass and leaving the root of the Jujun grass for sprouting. The Jujun grass has the characteristic of remarkably enriching the heavy mental cadmium and is capable of effectively utilizing the cadmium-polluted soil while continuously repairing the soil with the heavy mental cadmium pollution permanently at the same time.

The invention discloses a physico-chemical restoration method of copper-cadmium composite contaminated soil. Heavy-metal contaminated soil is subjected to physico-chemical restoration by a complex evaporation and absorption enrichment manner. The physico-chemical restoration method comprises concrete restoration steps of: firstly, adding a complex repair reagent to the contaminated soil, then fully ploughing and evenly mixing the soil and adding water; and covering a layer of natural cellulose adsorbing medium and naturally evaporating to dry in an environmental system at 35-45 DEG C after the soil surface is smoothed, thus finishing restoration. By using the method, the removal rates of total Cu and Cd in the soil can be up to over 37% and 56.9% respectively within a relatively short time (8-12 hours), and the removal rates of extractable Cu and Cd of hydrochloric acid in the soil can be up to over 60.7% and 69.4% respectively.

The invention provides a method for remediating soil co-contaminated by organochlorine pesticides and cadmium. The remediation method comprises the following steps: step 1, crushing the soil to be repaired, adding water, and turning the soil; step 2, adding additives, the Additives include distiller's grains, potassium palmitate, molecular sieves, humic acid, fly ash, silicon oxide, attapulgite, borax and sugarcane ash, turn over the soil, and let stand; Step 3, spray the seed liquid, the seed liquid includes Sporophages, Trichoderma, Lactococcus, covered with film; step 4, add compound fertilizer, turn over the soil, plant alfalfa and mountain lettuce seedlings, and harvest. The restoration method provided by the invention can simultaneously restore soil polluted by organochlorine pesticides and heavy metal cadmium, can shorten the restoration period, improve restoration and treatment efficiency, and has a significant and thorough restoration and treatment effect on soil polluted by organochlorine pesticides and heavy metal cadmium, and has broad application potential. Application prospects.

The invention discloses a treatment and repair particle for multiple heavy metal pollutants of soil. The treatment and repair particle is mainly formed by mixing an oxide compound medicament and an inorganic cementing material. A treatment and repair method for the multiple heavy metal pollutants of the soil comprises the following concrete steps of (a) mixing the oxide compound medicament and the inorganic cementing material according to the mass ratio of 1:5 to 50; (b) vibrating through a vibrating screen to form particles with the particle size being 5 to 10mm after mixing; (c) sealing and packaging the screened particles through water-soluble capsules, heating the water-soluble capsules to enable the water-soluble capsules to melt and shrink locally, and then cooling to the room temperature. The treatment and repair particle and the treatment and repair method provided by the invention has the efficacy of no toxicity, no residue, no teratogenicity, no mutation, no secondary pollution, and multiple functions. The method provided by the invention is simple and time and labor saving to operate, does not break original planting habits of farmers, is not affected by soil environment, soil desertification, PH value and weather conditions, and is stronger in practicability. The particle and the method balance both economic benefit and environment benefit, and can be fully applied in various heavy metal pollution soil treatment and repair in large scale.

The invention belongs to the technical field of pollution repairing and relates to a soil conditioner for repairing heavy metal polluted farmland and a production method of same. The soil conditioner includes biochar, minerals and cyclodextrin. The production method includes the steps of: (A) preparation of the biochar: calcining carya cathayensis peel carbon to obtain pyrolyzed biochar and performing high-pressure hydrothermal treatment to the carya cathayensis peel carbon to obtain hydrothermal biochar, and mixing the pyrolyzed biochar and the hydrothermal biochar to obtain the biochar; (B) preparation of the minerals: uniformly diatomite powder and chitosan according to the mass ratio of 3:1 to prepare a diatomite composite; (C) blending: uniformly mixing the pyrolyzed biochar, the hydrothermal biochar, the diatomite composite and sheep manure to prepare the soil repairing agent; and (D) granulation: mixing the soil repairing agent with cyclodextrin and performing granulation to obtain the soil conditioner. The soil conditioner, when being used for rice farmland, is economical and effective, allows in-situ repairing and has no addition of chemical substances.

The invention provides a method for restoring soil polluted by heavy metal through a combination of magnetotactic bacteria and plants. The magnetotactic bacteria and the soil polluted by the heavy metal are mixed and irrigated, and magnetic fields are arranged on the soil polluted by the heavy metal to collect heavy metal polluted soil containing the magnetotactic bacteria, drip washing of the soil polluted by the heave metal is conducted and backfill is conducted; bamboo willows and crimson leafbeet are planted on the soil polluted by the heavy metal at the same time, and the crimson leafbeet is removed after 50-60 days; then crimson leafbeet is planted again, and the crimson leafbeet is removed after 50-60 days; the steps of planting and removal of the crimson leafbeet are repeated; and the bamboo willows and the crimson leafbeet are removed at the same time 1.5-2.5 years later, and the steps are executed circularly and repeatedly until the content of the heavy metal in the soil is up to the safety standard. Compared with the prior art, the magnetotactic bacteria are easy to collect, the growth cycle of the bamboo willows is short and the absorption efficiency of the heavy metal is high. The crimson leafbeet is easy to grow and has a hyperaccumulation ability of cadmium. The method is capable of restoring the soil which is polluted by various heavy metals at the same time, and free of secondary pollution to the soil.

The invention discloses a compound soil repair agent, a preparation method and a repairing method thereof. The repair agent is composed of a hydroxyapatite-calcium silicate composite material and biochar, the mass ratio of the hydroxyapatite-calcium silicate composite material and the biochar is 4 to 6-9 to 1, and the biochar is poplar base biochar. The preparation method comprises the steps thatdispersion liquid of calcium chloride and dispersion liquid of sodium silicate are correspondingly prepared firstly, then a calcium chloride solution is dropwise added into a sodium silicate solutionunder ultrasonic to react, washing by deionized water and filtering are conducted after reaction is completed, calcium silicate hydrate precipitation is obtained and added into a phosphate solution toreact, the hydroxyapatite-calcium silicate composite material is obtained after filtering, and then the biochar is mixed with the composite material according to the mass ratio to obtain the soil repair agent. According to the compound repair agent, when the ratio of the hydroxyapatite-calcium silicate composite material and the biochar is 4 to 6, mutual promotion between the materials is achieved, the synergistic effect is generated, the long-term and high efficient repair effect can be achieved for heavy composite metal contaminated soil, the cost is low, the using amount is small, and environmental protection is achieved.

The invention discloses a treatment method for heavy metal contaminated soil, relating to the technical field of contaminated soil recovery. The treatment method comprises the following steps: (A) crushing to-be-treated contaminated soil; and (B) scattering a powder agent in a heavy mental soil treatment agent into the to-be-treated contaminated soil in the step (A), and spraying a water agent in the heavy mental soil treatment agent until the soil is drenched after the crushed soil and the powder agent is mixed uniformly, wherein the weight ratio of the applied heavy mental soil treatment agent to the contaminated soil is 1 to (5-6). The heavy metal contaminated soil is treated by virtue of the treatment method, so that the content of heavy metal in the soil can be rapidly decreased, the soil structure is changed, and the propagation of microorganisms is increased.

The invention relates to a method for in-situ repair of heavy metal Pb and As-polluted soil, and belongs to the technical field of heavy metal-polluted soil repair. The method uses monoammonium phosphate, diammonium phosphate, calcium superphosphate, polyaluminum ferric chloride, polyaluminium ferric sulfate, ferrous chloride and calcium oxide as raw materials; and the raw materials are fully smashed and mixed by a ball mill to obtain a soil heavy metal repair curing agent. The raw materials for synthesizing the curing agent are cheap and easy to obtain; and when the heavy metal Pb and As is cured in situ, such nutrient elements as phosphorus, nitrogen, sulfur and iron are supplied to soil, so that the polluted soil repair is integrated with the fertilization, the repair cost of the heavy metal-polluted soil can be effectively reduced, and the method is suitable for repairing large-range heavy metal-polluted soil.

The invention relates to soil and sediment remediation. The invention discloses a batch process of remediation of soil and sediment contaminated with toxic metals which is selected from the group consisting of Pb, Zn, Cd, Cu, Hg, Ni, Mo, Tl, Cr, U, Cs and Sr. In the method, apart from alkaline sedimentation of toxic metal hydroxide, toxic metals are removed from process solutions through alkaline adsorption of a polysaccharide adsorbent. Through application of alkaline adsorption, the efficiency of toxic metal removal from process solutions and alkaline and acidic recycling of chelating agent, i.e., EDTA, is significantly improved

The invention provides a phosphogypsum soil conditioner and a preparation method thereof, which are used for improving soil polluted by heavy metals, and belong to the field of soil conditioners. The phosphogypsum soil conditioner is prepared by taking phosphogypsum treated by active microorganisms as a carrier and adding modified activated carbon and an adsorbent for blending. The mass of the phosphogypsum accounts for 40-60% of the total mass of the conditioner; the mass ratio of the modified activated carbon to the phosphogypsum is 1: (3-5); and the balance is the adsorbent. The soil conditioner disclosed by the invention is rich in minerals, contains various fermentation active matters, and can be used for remarkably improving the activity of microorganisms in soil so as to improve the activity of phosphatase, so that the remediation capability of the soil is improved, an elastic mechanism of the soil for heavy metal sedimentation is formed, and the treatment effect on the heavy metal contaminated soil is remarkably improved.

The invention belongs to the technical field of chemical engineering, and relates to soil contamination restoration agents, in particular to a heavy metal contaminated soil restoration agent. The heavy metal contaminated soil restoration agent is mainly characterized by being prepared from medical stone, bentonite, perlite, diatomite, charcoal, a chelating agent and an appropriate quantity of a plant growth regulator in parts by weight. Field experiments prove that, compared with the prior art, the heavy metal contaminated soil restoration agent has the significant advantages that the comprehensive restoration capacity is sufficient, stable and long-term for various heavy metal contaminated soil, the coverage is enlarged, the pertinence is exact, the restoration agent can supply nourishment nutrition to contaminated soil, regulate plant growth, and quicken improvement and restoration.

The invention discloses a treatment method for contaminated soil and relates to the technical field of restoration of the contaminated soil. The treatment method comprises the following steps: A, crushing the contaminated soil to be treated; B, scattering powder in a soil heavy metal treatment agent into the soil to be treated in the step A, uniformly mixing crushed soil with the powder and then spraying water in the soil heavy metal treatment agent into the mixture until the soil is wet through, wherein the weight ratio of the dosed soil heavy metal treatment agent to the contaminated soil is 1:(5-6). The soil contaminated by heavy metal is treated by adopting the method, so the content of the heavy metal in the soil can be quickly reduced, the soil structure is changed, and the breeding of microorganisms is improved.

The invention discloses a soil remediation agent. The soil remediation agent is prepared from the following raw materials in parts by weight: 20-35 parts of modified diatomite, 10-20 parts of desulfurized gypsum, 8-15 parts of straw, 6-12 parts of fly ash, 4-10 parts of attapulgite, 2-8 parts of trichoderma humic acid and 1-4 parts of modified nano zero-valent iron. The soil remediation agent disclosed by the invention has an efficient remediation effect on soil polluted by organic phosphorus and heavy metals, and the content of the organic phosphorus and the heavy metals in the polluted soilcan be efficiently reduced; according to the modified diatomite disclosed by the invention, the content of organic phosphorus and heavy metals in polluted soil can be efficiently reduced by the modified nano zero-valent iron, and the modified diatomite and the modified nano zero-valent iron have a synergistic effect on the aspect of heavy metal Cd pollution.

The invention belongs to the technical field of restoration of heavy metal contaminated soil and particularly relates to a restoration method of the heavy metal contaminated soil. The restoration method is characterized by comprising the following steps that firstly, the soil to be processed is crushed so as to be screened conveniently; secondly, the crushed soil is screened through a screening device so that soil meeting the pore diameter requirement can be left for restoration; thirdly, an IDS eluting agent is prepared, specifically, the concentration of the IDS eluting agent is 7-11 mmol/L; fourthly, the soil obtained through screening is eluted with the IDS eluting agent; fifthly, filter pressing is carried out so that the eluted soil can be separated from waste fluid; and sixthly, the IDS eluting agent in the waste fluid obtained through separation is recycled, and the soil subjected to filter pressing is cleaned. The method is mainly applicable to restoration of soil contaminated by the heavy metal such as Cd, Cu and Pb, and is simple, easy to implement, short in cycle and remarkable in treating effect; and besides, the solution is easy to recycle and reuse, so that cost is low.

The invention relates to the field of soil restoration, especially relates to the field of restoration of soil polluted by heavy metals, and particularly relates to a passivation agent for cadmium polluted alkalescent soil and a restoration method. The passivation agent is prepared from montmorillonoid and cow dung. The dosage of the passivation agent is 16%. The passivation agent formed through combination of montmorillonoid and cow dung can remarkably reduce the concentration of effective state Cd in the polluted farmland soil. Meanwhile, a test proves that the passivation agent formed through combination of montmorillonoid and cow dung has a better passivation restoration effect compared with independent application of cow dung or montmorillonoid, and the passivation rate is obviously higher than the sum of the passivation rates of montmorillonoid and cow dung. When the application rate of the passivation agent is 16%, the passivation rate can be as high as 81.48%. Therefore, the passivation agent provides a more effective new route for restoration of the alkalescent farmland soil polluted by the heavy metals.

The present invention relates to novel Pcr family genes which confer tolerance to heavy metals to organisms. More particularly, the present invention relates to novel Pcr family genes which confer tolerance to cadmium. Organisms transformed with any of the Pcr genes thereby have improved resistance to and increased level of toxic materials. Soil and water contaminated with heavy metals can be cleaned in an environment-friendly and economical manner by growing the Pcr-transformed organism, especially a plant transformed with the Pcr gene.

The invention discloses application of leucaena glauca in reparation of soil polluted by heavy metal cadmium. Leucaena glauca seedlings belonging to cultivated leucaena glauca are directly transplanted into the soil polluted by cadmium heavy metal in the middle of May every year, wherein the seedlings are 6 to 9cm high, the row spacing is 20cm, the line spacing is 25cm, 22 seedlings are planted every square meter; before transplanting, base fertilizer, comprising 10 to 12kg of pure nitrogen, 7 to 8kg of phosphorus pentoxide and 8 to 9kg of potassium oxide, is applied per mu; and then the base fertilizer is covered with thin soil which is about 1cm thick; after the seedlings grow for 60 days, topdressing is carried out, to be specific, 3kg of pure nitrogen is applied per mu; in a plant cultivation stage, the water irrigation amount per mu is 6 to 8m<3>; and the leucaena glauca is harvested once or twice one year. By using the enrichment characteristic of the leucaena glauca to cadmium, the soil polluted by cadmium can be repaired for a long time by the leucaena glauca; the root and secreted nitrogen-fixing bacteria of leucaena glauca also can be used for regulating water in soil and conserving nitrogen in the soil; diffusion of pollutants and water and soil loss can be prevented; and the fertility of the soil can be improved.

The invention discloses a soil conditioner for treating heavy metal pollution of cultivated land, and relates to the technical field of soil conditioners. The soil conditioner is prepared from the following raw materials in percentage: 25 to 30 percent of plant ash, 4 to 6 percent of calcium magnesium phosphate fertilizer, 4 to 6 percent of quick lime, 15 to 18 percent of zeolite, 2 to 4 percent of hydroxyapatite, 20 to 22 percent of organic fertilizer, 3 to 5 percent of composite algae powder, 10 to 13 percent of humic acid resin, 5 to 8 percent of sodium-based modified bentonite, 1 to 2 percent of magnesium silicate and 3 to 4 percent of potassium sulfoselenide. The soil conditioner comprises, by weight, 1-2% of nano zero-valent iron and 2-3% of modified molybdenum disulfide, the sum of the content percentages of all the parts is 100%, and the soil conditioner is quick, efficient and safe in heavy metal polluted farmland remediation and can be widely applied.