45 results about "Pb contaminated soil" patented technology

A composite eluting agent for restoring Cd and Pb contaminated soil and an application method thereof belong to the technical field of soil restoration. The eluting agent is prepared mainly from EDTA (ethylenediaminetetraacetic acid) and an organic acid, wherein the organic acid is from one or any of oxalic acid, lactic acid, citric acid, humic acid, and fulvic acid. The application method of the composite eluting agent comprises the steps of (1) subjecting contaminated soil to simple crushing, and screening to remove large foreign matters and stone; (2) adding an eluting agent to the contaminated soil, keeping soil-water ratio to 1:5 to 1:10, and stirring with the soil for 2-4 h; (3) after solid-liquid separation, treating the eluting agent for recycling, adding the composite eluting agent to the contaminated soil, and stirring again for 3-6 h; (4), carrying out solid-liquid separation, and adding tap water for cleaning and eluting to obtain clean soil. By means of multi-step elution and using composite eluting agents different in concentrations, it is possible to effectively reduce Cd and Pb in soil; the method is a truly practical and economically practical eluting method.

The invention discloses a plant restoring method of lead polluted soil, which comprises the following steps: planting butterflybush flower in the soil polluted by lead through direct transplanting or sowing pattern, controlling the soil acidity at neutral or acidness, harvesting periodically or according to lead content or growing height, remaining certain segment of sprout, disposing the harvested material at special place.

The invention discloses a method for remediating lead-contaminated soil or water, which comprises the following steps: (1) collecting Polygonum criopolitanum; (2) planting Polygonum criopolitanum in soil or water; (3) periodically harvesting the Polygonum criopolitanum and part of stolons above the ground or water; (4), continuing to plant and harvest the Polygonum criopolitanum till the lead content of the soil or water reaches a safe standard; and (5) performing pollution-free disposal on the harvested Polygonum criopolitanum. In the method of the invention, the Polygonum criopolitanum is planted in the lead-contaminated soil or water, so extraction can be performed continuously, the remediation process of the soil and water is simplified, and the lead contamination problem of soil can be solved radically. The method of the invention is low in cost and high in maneuverability and avoids damaging the structure of the environmental soil and causing secondary pollution.

The invention belongs to the field of soil remediation, and discloses a soil remediation agent for reducing high-concentration cobalt and lead pollution and an application of the soil remediation agent. The soil remediation agent comprises the following components in parts by weight: 5-13 parts of sodium cetyl benzene sulfonate, 4-11 parts of calcite in powder, 7-15 parts of tartaric acid, 3-10 parts of acetylacetone, 6-11 parts of calcium chloride and 4-9 parts of sodium pyrophosphate. The application of remediating the soil by the soil remediation agent comprises the steps of crushing, mixing, spraying, plowing and the like, thus the pollution degrees of cobalt and lead in the soil can be effectively lowered.

The invention provides a method for restoring cadmium and/or lead polluted farmlands through enriched sunflower varieties. The method includes the steps of sowing sunflowers into moderately or slightly cadmium and/or lead polluted soil, absorbing cadmium and/or lead in the polluted soil through root systems of the sunflowers and transferring the cadmium and/or lead to the over-ground part; and harvesting the sunflowers absorbing the cadmium and/or lead. After harvested, the sunflowers can be transported to a special site uniformly and receive innocent treatment. According to the method, the sunflowers can absorb and accumulate the cadmium and/or lead in the polluted farmland soil and transfer the cadmium and/or lead to the over-ground part according to the characteristics of high stress resistance, fast growth, large biomass and co-enrichment of the cadmium and/or lead of the sunflowers, and therefore the content of the cadmium and/or lead in the polluted soil can be lowered. The method is suitable for treating and restoring the moderately or slightly cadmium and/or lead polluted farmland soil. Because the stress resistance of the sunflowers is high and management of the sunflowers is extensive in the growth process, the cost is low, the operability is high, and the application prospect is wide.

The invention discloses a pb-contaminated soil stabilizer and a preparation method thereof and belongs to the technical field of soil remediation. The pb-contaminated soil stabilizer is prepared fromraw materials in parts by weight as follows: 20-40 parts of red mud, 10-30 parts of carbide slag, 15-25 parts of fly ash, 5-15 parts of sodium dihydrogen phosphate, 10-20 parts of diatomite, 5-15 parts of calcium superphosphate and 10-20 parts of polyoxyethylene fatty alcohol sodium sulfate. The invention further discloses the preparation method of the pb-contaminated soil stabilizer. With the adoption of the pb-contaminated soil stabilizer, pb dissolution is reduced, bio-availability and hazardous toxicity of pb are reduced, migration of heavy metal and enrichment of the heavy metal in ecological chains are reduced, and the pb-contaminated soil stabilizer prevents pollution from rebounding with time, can be applied to subgrade bricks and the like and has the characteristics of being economical and environmentally friendly.

The invention relates to a composite preparation for fixing lead in soil and a preparation method and an application thereof. The composite preparation provided by the invention is composed of 10-80 parts by mol fraction of hydroxyapatite and 5-20 parts by mol fraction of potassium chloride, preferably 40-80 parts by mol fraction of hydroxyapatite and 10-15 parts by mol fraction of potassium chloride, most preferably 75-80 parts by mol fraction of hydroxyapatite and 10-15 parts by mol fraction of potassium chloride. The hydroxyapatite and potassium chloride are smashed and are mixed in proportion, thus the composite preparation in the invention is obtained. When the composite preparation provided by the invention is used for repairing lead polluted soil, the composite preparation is uniformly mixed with the soil to be repaired according to the mol mass ratio of the composite preparation to Pb in the lead polluted soil, namely HA: KCl: Pb= (10-80): (5-20): 10. By applying the composite preparation provided by the invention, the lead polluted soil can be effectively repaired, the fertility of the soil can be improved, and the agricultural value of the repaired soil can be improved.

The invention relates to a method for strengthening remediation of lead contaminated soil by combining gibberellin and ethylenediamine tetraacetic acid. Ryegrass is planted in the lead contaminated soil, gibberellin (GA3) is added in a foliar spray form, and the ethylenediamine tetraacetic acid (EDTA) is directly added into the soil, therefore, the purpose of strengthening remediation of the lead contaminated soil by the plants is achieved. The GA3 at the concentration of 1mu M or 10mu M can obviously relief toxicity for the plants caused by Pb and/or EDTA, and the effect of strengthening remediation of the EDTA can be significantly improved. However, 100mu M GA3 inhibits the growth of the plants, and significantly reduces the concentration of lead in the plants. The method provided by the invention is used for carrying out in situ remediation, has the advantages of low cost, simple process, environmental friendliness and the like, has a good remediation effect on lead contaminated soil, and is suitable for remediation of lead contaminated soil.

The invention relates to a method for fixing lead pollution in soil by utilizing seashore paspalum lawns, which belongs to the field of environmental improvement. The seashore paspalum lawns are planted on the soil with different lead pollution degrees by the method and the lead in the soil is absorbed and fixed through the dense underground root networks of the seashore paspalum lawns so as to prevent the rain water leaching loss of lead infectants in the soil. The seashore paspalum lawns can form dense ground surface lawn coverage, thereby preventing the lead polluted soil from spreading through raise dust. The lead content in leaves on the seashore paspalum lawns is extremely less and is only 6 to 13 percent of that in the soil and the lead is fixed in leaf tissues, thereby isolating the risk of contacting the lead pollution of people. In addition, the seashore lawns also have better sight effect and soil fixing effect and have double effects of fixing plants of the polluted soil and greening and beautifying environment.

The invention discloses an acid phosphate stabilization reparation method of lead contaminated soil. The acid phosphate stabilization reparation method is characterized by comprising the following steps: adding a sodium phosphate and phosphoric acid mixed solution into lead contaminated soil, stirring uniformly, and then maintaining. According to the invention, after stabilization treatment, the lead content of leachate in the lead contaminated soil is less than the lead content concentration limit value 0.25mg/L in standard for pollution control on the landfill site of municipal solid waste. The stabilization treatment time only needs 3 days, and the cycle is short; the reason for the short stabilization treatment time by using the acid phosphate solution is that a hydrogen ion can promote lead at the weak acid state to be dissolved, and moreover, a phosphate anion and a lead ion can generate lead phosphate precipitate which is insoluble in water.

The invention discloses a method for remediating Pb contaminated soil by accumulator flower iris. The method comprises the following steps: (1) variety selection; (2) soil preparation; (3) planting; (4) post-planting management. The Pb contaminated soil is remediated by the accumulator flower iris, the method has the advantages of causing no damage to physical and chemical properties of the soil or causing no secondary pollution, protecting the tillage layer from wind erosion and water erosion, being low in cost and high in operability and the like, is an ideal method for remediating the Pb contaminated soil, and has good market popularization and application values.

The invention provides a method for utilizing cold-resistant winter rapes for repairing cadmium and/or lead polluted farmland in winter. The method comprises the steps that before winter comes, the winter rapes are sown into the medium or mild cadmium and/or lead polluted soil, sprout, survive and grow, the root systems of the winter rapes absorb heavy metal cadmium and/or lead in the polluted soil, and the heavy metal cadmium and/or lead are/is transferred to the position above the ground; and the winter rapes absorbing the heavy metal cadmium and/or lead are harvested. After the winter rapes are harvested, the winter rapes can be conveyed to an exclusive place to be subjected to harmless treatment in a centralized manner. According to the method, the characteristics that the winter rapes are high in cold resistance and gather the cadmium and/or lead together are utilized, the cadmium and/or lead heavy metal accumulated in the polluted farmland soil are/is absorbed and transferred to the overground part, and therefore the content of cadmium and/or lead in the polluted soil is reduced. The method is suitable for treating and repairing of the medium or mild cadmium and/or lead polluted farmland soil in winter, and meanwhile due to the fact that the winter rapes are high in cold resistance, management is extensive in the growing process, and the farmland resource in summer is not occupied, the cost is low, operability is high, and good actual application prospects are achieved.

The invention discloses a method for repairing Cd or Pb contaminated soil by combining coal gasification slag with ryegrass. The method comprises the following steps: 1, air-drying soil, and sieving to remove impurities; 2, adding the coal gasification slag into the sieved soil, and uniformly mixing to obtain mixed soil; 3, carrying out chemical treatment on the mixed soil to obtain Cd or Pb contaminated soil; and 4, sowing ryegrass seeds in the Cd or Pb contaminated soil. The coal gasification slag and the ryegrass are combined to repair the Cd or Pb contaminated soil; a porous structure of silicate minerals and carbon particles in the coal gasification slag is utilized; the tolerance of ryegrass to Cd or Pb is improved, so that the remediation capacity and efficiency of ryegrass to Cd orPb contaminated soil are synergistically improved, the harm of leaching of Cd or Pb to underground water and the pollution of Cd or Pb to the environment are reduced, meanwhile, secondary pollution to the environment is avoided, and resource utilization of wastes is realized.

The invention discloses trichoderma asperellum. The strain is collected in the CGMCC on January 22, 2018, with the biological collection number of CGMCC NO.15266. The trichoderma asperellum obtained by screening and separation is excellent in tolerance and adsorption capacity for various heavy metals, particularly for lead; the trichoderma asperellum is easy to colonize and survival in heavy metal-polluted soil, particularly in lead-polluted soil, and is suitable for microbial repairing for the soil.

The invention discloses a soil purification device for lead pollution. The soil purification device comprises a lead pollution treatment well, immobilized microbial balls, a magnetic field generating device, a water pump and water spraying tubes. The lead pollution treatment well is sequentially provided with a gravel layer, an artificial substrate layer, an immobilized microorganism layer and a water permeable layer from outside to inside. The artificial substrate layer is composed of clinoptilolite and limestone. The magnetic field generating device comprises a spiral coil, a transformer and a power source, wherein the spiral coil is twined on the periphery of the immobilized microorganism layer; the spiral coil is electrically connected with the transformer; and the transformer is electrically connected with the power source. The water permeable layer is composed of a film component, and a water well is arranged in the middle of the water permeable layer. A water pumping tube is connected into the water well and is connected with a water pump, and the water pump is connected with the water spraying tubes. The water spraying tubes are evenly distributed on the surface of soil. According to the soil purification device for lead pollution, lead in the soil can be removed, and water is recycled.

The invention relates to a microorganism for repairing cadmium/and lead polluted soil and a repairing method. The nucleotide sequence of a first microorganism bacterium is shown as SEQ ID NO.1 and is named as QX8; the nucleotide sequence of the second microbial bacterium is as shown in SEQ ID NO.2 and is named as QX13; and the nucleotide sequence of the third microbial bacterium is named as TS6 as shown in SEQ ID NO.3. According to the technical scheme, microorganisms capable of being used for repairing the cadmium/lead polluted soil are screened out, the microbial agent is applied to the roots of plant varieties capable of absorbing cadmium/lead in the soil, and after the microbial agent is applied to the roots of the plants, on one hand, substances capable of promoting plant growth can be secreted, and on the other hand, the growth of the plants can be promoted. The microbial agent has the effect of promoting heavy metals in soil to be transferred to plant roots by secreting corresponding products, and the enrichment capacity of plants on cadmium/lead in the soil is improved.