43results about "Contaminated soil reclamation" patented technology

The invention discloses a layered remediation method for chromium contaminated soil. The method comprises the following steps: detecting the actual chromium contamination condition of soil, determining the boundary of severe and mild chromium contaminated soil on soil depth, performing remediation on the severe chromium contaminated soil by adopting a chemical reduction stabilization method, performing remediation on the mild chromium contaminated soil by adopting a chemical or biochemical reduction stabilization method, performing soil conservation, balancing the soil acidity and alkalinity and performing later-stage tracking and monitoring. An actual chromium contaminated field serves as a support, the combined remediation methods are selected aiming at the current situation that the contamination degrees of the upper soil and the bottom soil are different, the severe chromium contaminated soil on the surface layer is subjected to remediation by adopting the chemical reduction stabilization method, the mild chromium contaminated soil on the deep layer is subjected to remediation by adopting the chemical or biochemical reduction stabilization method, the defects that the soil properties are not distinguished and a same remediation method is adopted in a unified mode in the previous research are overcome, and ex-situ remediation and in-situ remediation are combined to be used, so that the remediation method is reasonable in application under the condition that the remediation effect is guaranteed, the remediation cost is reduced, and the method can be applied to actual soil remediation on a large scale.

The invention discloses a remediation method for cadmium-contaminated soil, and belongs to the field of soil remediation. In the remediation method, wood vinegar and biochar are prepared from rice straw and/or oilseed rape straw; paddy rice is planted in the cadmium-contaminated soil from May to October of each year firstly, and biochar is applied before paddy rice planting, so that paddy rice conforming to the national standard can be prepared in the cadmium-contaminated soil (to be specific, the cadmium content conforms to the national standard); oilseed rape is planted in the cadmium-contaminated soil from the time after the harvest of the paddy rice to May of next year, and wood vinegar is applied in a specific period to remove cadmium in the cadmium-contaminated soil safely and effectively, so that cadmium in the soil is effectively removed. Moreover, the method effectively utilizes the whole year, thereby guaranteeing the harvest of cereal crops while realizing the remediation of contaminated soil.

The invention discloses a solid microbial agent used for remedying the soil contaminated by petroleum, belonging to the technical field of bioremediation of soil contaminants. First-class seed liquid of acinetobacter radioresistens and rhodococcus erythropolis are mixed in equal parts after two steps of fermentation in liquid and solid states and cultivation to obtain the solid microbial agent, wherein, the number of effective viable bacteria of acinetobacter radioresistens and rhodococcus erythropolis is 10 to 10 CFU/g. The solid microbial agent in the invention has the advantages of low cost, high number of viable bacteria; the invention further has the advantages that micro-ecological environment improvement of the soil can be improved and secondary contamination cannot be caused to the environment, thus applicable to the bioremediation of the soil which is contaminated by petroleum and petroleum products.

The invention relates to a soil pollution treatment method and equipment. The method is used for the soil pollution treatment equipment. The method comprises the steps that moving to a target position is conducted according to a specified motion track; soil environment data of the target position are detected; a pollution repairing strategy at least corresponding to a pollution diagnosis result determined according to the soil environment data is obtained; and in terms of the pollution repairing strategy, pollution repairing operation is executed in the target position. According to the soil pollution treatment method and equipment, environment pollution status real-time monitoring and in-situ rapid repairing can be achieved simultaneously, and pollution dispersion and continuous damage to the environment are avoided. Rapid response, including entering into a pollution site timely to detect pollution status and conduct rapid repairing treatment on the pollution site, to emergent environment pollution accidents can be achieved; and furthermore, a pollution site where people cannot enter easily can be subjected to pollution detecting and repairing.

The invention discloses a remediation material and a remediation method for heavy metal contaminated soil, and belongs to the technical field of soil remediation. The remediation material comprises, by weight, 20-60 parts of modified clay minerals, 30-60 parts of calcium-magnesium based composite materials and 5-10 parts of magnesium oxides. The remediation material and the remediation method havethe advantages that the natural minerals serve as main bodies of the repairing material, free heavy metal ions can be adsorbed through reactions, the remediation material is not easy to dissolve in water, heavy metals are prevented from being absorbed by root systems of crops and animals, and the pollution risks of the water and soil environment are greatly reduced; the remediation material is low in cost, green, natural, and free of secondary pollution.

The invention provides a remediation method of soil polluted by heavy metals. The method is technically characterized in that the heavy metals in the soil are fixed by using properties of adsorption and solidification of red mud on the heavy metals; simultaneously, the red mud cooperates with plants which are planted on the surface of the soil and are capable of absorbing the heavy metals so as tofurther enhance the effect of removing the heavy metals, the plants are removed, then the heavy metals are removed, the plants are carbonized and leached, then the heavy metals are separated from carbon; in addition, the red mud is capable of releasing excessive -OH ions into the soil, enabling inorganic phosphorus in the soil to be hardened and enabling the alkalinity of the soil to be increased; the red mud is also compounded with phosphorus solubilizing bacteria and EM bacteria liquid; the phosphorus solubilizing bacteria have the effects of avoiding reduction of the content of free-statephosphorus in the soil and simultaneously avoiding rapid increase of the alkalinity of the soil.

The invention discloses a method for producing safe agricultural product on organic contaminated soil. The following steps are included: 1) a surfactant is added into water, heated and stirred to be dissolved to obtain a surfactant solution with the concentration of 500-6000 mg/L, which is prepared to be used until being cooled down to the room temperature; 2) the prepared surfactant solution is added directly into the organic contaminated soil by 50-600 mg/kg which is calculated based on the dry soil weight; 3) the crop is planted on the soil. The invention is easy to operate, economical and practical, and has distinct effect; the agricultural products produced by the method contain obviously decreased organic contaminants. The invention is applicable to the production of safe agricultural products on the organic contaminated soil.

The invention discloses a remediation method for cadmium-nitrate combined pollution of facility agriculture soil. The remediation method comprises the following steps: (1) planting sedum alfredii hance in soil under remediation, regularly harvesting the sedum alfredii hance, and removing the sedum alfredii hance after harvesting twice or triple; (2) after removing the sedum alfredii hance, planting port-grown green-stem slim-leaf water spinach, and flooding the plants with water during growing; (3) after harvesting the port-grown green-stem slim-leaf water spinach, further planting Siyuebai pakchoi in the soil; and (4) repeating steps (1) to (3) until the soil is up to the standard. According to the remediation method for cadmium-nitrate combined pollution of facility agriculture soil, the rotation manner of a Cd-hyperaccumulator, a cadmium-nitrate low-accumulation aquatic vegetable, and a cadmium-nitrate low-accumulation terraneous vegetable is adopted, and the edible safety of the vegetables is guaranteed while the soil is remediated.

The invention discloses a waste mine remediation method based on biological habitat remediation. The waste mine remediation method comprises the following steps: S1, investigating of the current situation of a waste mine: a step of checking the damage and pollution degree of the mine, collecting some soil for detection at the same time, and checking the polluted degree of the soil so as to distinguish which part of the soil is severely polluted and which part of the soil is not severely polluted. The waste mine remediation method provided by the invention has the following beneficial effects:the soil can be remediated; meanwhile, plants can be planted according to soil conditions; the survival rate of the plants is greatly improved; large-area coverage of a large amount of nutrient soil is avoided; through drainage ditch construction, surface water flowing through a mining area is discharged to a downstream, so the length and the contact time of rainwater flowing through polluted soilof the mining area are reduced; the planted plants can effectively maintain the erosion resistance of water, soil and the ground surface, so the remediation effect of the mine is greatly improved; meanwhile, the remediation time is shortened, and great convenience is brought to users.

The invention discloses a method for remediating soil polluted by Cu, Pb and As by inoculating sunflower and castor with bacillus subtilis and relates to the technical field of environmental remediation. The method includes: preparing a bacterial suspension, inoculating seeds with the bacterial suspension, preprocessing soil, culturing, managing, removing, performing subsequent processing and thelike. The method has the advantages that Cu, Pb and As are gradually transferred into the plant bodies of the castor inoculated with the bacillus subtilis and the sunflower inoculated with the bacillus subtilis during the growth of the plant bodies, and then the whole plant bodies are removed from the soil so as to remove the excessive Cu, Pb and As in the soil; the method is good in remediating effect on the soil polluted by Cu, Pb and As and easy to implement and popularize.

The invention relates to the field of soil pollution treatment facilities, and in particular relates to a soil repairing system which comprises a soil digging device, a soil separation device, a soil conveying device, a chemical feeding device and a mixing device. By virtue of the cooperation of the five parts, the purpose of soil repairing is achieved, the structures of different parts are reasonably designed, and the repairing efficiency and the repairing effects are greatly improved as a whole.

The invention relates to a permanent-magnet separator for separating harmful heavy metal in soil. The permanent-magnet separator comprises a stander, hydraulic pumps, a plurality of permanent magnets and a material containing basin. The permanent-magnet separator is characterized in that a lifting plate is together supported by the hydraulic pumps on the stander, respectively, wherein the permanent magnets are designed on the lifting plate; a casing plate is fixed on the stander among the hydraulic pumps by virtue of a connector, a plurality of nonmagnetic metal casings are designed on the casing plate, and one permanent magnet is movably connected in each cashing pipe; the movable material containing basin is arranged at the bottom of the stander. Compared with the prior art, the permanent-magnet separator has the advantages that the structure is simple and scientific, the harmful heavy metal in the soil can be separated, and the permanent-magnet separator can be used for effectively separating the harmful heavy metal from the soil, the purposes of improving the soil, benefiting the environmental protection and the body health of people, realizing the utilization of waste and turning the waste into wealth are achieved, and the permanent-magnet separator is suitable for processing the soil severely polluted by heavy metal.

The invention discloses a method for soil remediation. The method for soil remediation comprises the following step of (1) soil filtering, specifically, soil containing garbage is excavated and loosened through an excavator and then is subjected to primary filtering through a filtering net, and after being filtered, the soil is flattened again through the excavator. By carrying out primary filtering on the to-be-remediated soil, most solid substances, particularly metal and plastic products incapable of being naturally decomposed, can be filtered out, and thus the soil keeps clean; remediationis conducted by planting poplars, the effect that plants absorb part of elements in the soil can be effectively promoted, and thus overhigh sulfur and phosphorus elements in the plants are reduced; and meanwhile, grass has strong vitality, grow rapidly and can also be converted into nutrient substances after death.

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 invention discloses a composite improver for repairing heavy metal contaminated soil and a preparation process thereof. The composite improver mainly comprises the following raw materials in parts by mass: 260-310 parts of organic fertilizer, 25-31 parts of microbial agent, 0.03-0.07 part of difenoconazole, 0.05-0.1 part of pyrethrum, 0.03-0.09 part of bacillus thuringiensis, 0.04-0.08 part of dioctyl divinyltriamino glycine and 0.02-0.06 part of lactobacillus plantarum. The composite improver is simple in formula and low in cost, and has a significant effect of improving the heavy metal contaminated soil.

The invention discloses an in-situ vibration wash restoration method for a polluted soil body. The method comprises the following steps: 1) determining pollution character and range of the soil body, and selecting and determining the type of washing fluid; 2) dividing the polluted soil body into a plurality of blocky soil bodies, and arranging seepage-proofing baffles on the bottom surface and four sides of each blocky soil body respectively for separation; 3) digging a liquid collecting trough in a clean soil body at one edge of the polluted soil body; 4) enabling the most marginal blocky soil body to be adjacent to the liquid collecting trough, and forming a plurality of through holes in the seepage-proofing baffle facing to the liquid collecting trough; 5) conducting vibration wash restoration on blocky soil body adjacent to the liquid collecting trough; 6) draining the liquid collecting trough, ploughing restored blocky soil body into the liquid collecting trough, forming a new liquid collecting trough in the original position of the restored blocky soil body, and repeating the step 4) and 5); 7) repeating the step 6) until the whole polluted soil body is completely restored. The in-situ restoration of the soil body is realized, the cost of soil body restoration is reduced, and the restoration efficiency of the polluted soil body is improved.

The invention relates to an on-line water supplementary device for maintaining polluted soil electrical restoration efficiency. The on-line water supplementary device comprises a multi-channel peristaltic pump, a liquid separate charging controller, a PLC module group and a host computer which are sequentially connected and a soil conductivity sensor and a soil water sensor which are connected with the PLC module group; and the soil conductivity sensor and the soil water sensor are arranged in the soil. A method comprises the steps that when soil conductivity in each area is lowered to 10% of initial conductivity, the host computer starts the separate charging controller after obtaining the water supplementary amount of each area according to a water-conductivity relation curve; a peristaltic pump first channel module is controlled to supplement water for a high field strength area; and a second channel module and a third channel module are separately controlled to supplement water for a medium field strength area and a low field strength area through electronic flowmeters. According to the on-line water supplementary device, soil water is automatically supplemented based on the relation between the soil water and the conductivity; the polluted soil electrical soil restoration efficiency under an electrical field switching condition is maintained; and the restoration cost is lowered. The on-line water supplementary device can be applied to practical application for large-scale polluted soil electrical and electrical-biological restoration sites.

The invention provides a method for remediating polychlorinated biphenyl polluted soil through the combination of chemical elution and plants, and belongs to the field of polluted soil remediation. The method comprises the following steps that the polluted soil to be remediated is collected, ground, crushed and screened through a 60-mesh sieve, the water content of the screened soil is adjusted to be 40%-60% of the field water capacity of the soil, and the soil is kept for standby application; medicago sativa seeds with white buds being exposed through bud forcing treatment are evenly sown in the standby soil and cultivated, medicago sativa plants are thinned out after growing for two weeks, and the cultivation period of the medicago sativa plants is 90 days; and the process that eluant is sprayed into the soil is started from thinning-out, the eluant is sprayed once every 5-8 days, and thus polychlorinated biphenyls in the soil are removed. Compared with the prior art, the method is advantageous in that operation is easy, the treatment effect is good, and in-situ remediation can be achieved; the influence on the original environment is small in the remediation process, and the method can be used for a wide range of types of soil; when the method is used for practical environmental remediation, the secondary pollution risk is greatly reduced, and follow-up soil cyclic utilization is facilitated.

The invention discloses a soil composite modifier and application thereof. The soil composite modifier is prepared from, by mass, 10-20% of activated sludge, 10-20% of fulvic acid, 10-20% of charcoal,1-5% of microbial agent, 10-20% of calcium bentonite, 5-10% of zeolite flakes, 20-30% of sulfate reducing bacteria liquid and 20-30% of organic fertilizer. The prepared composite improver for the construction waste contaminated soil can improve the problem of soil alkalinization caused by disordered stacking and landfill of construction waste, can adsorb heavy metals in the construction waste andheavy metals in the deep layer of the soil, has a good effect of removing heavy metal ion pollution, meets the requirements of plant growth, and can be used for alkaline soil remediation, remediationof heavy metal pollution in soil caused by disordered stacking and landfilling of construction waste and remediation of deep soil pollution.

The present invention relates to a Sphingomonas sp. MD2 strain (KCTC 11845BP), a composition including the strain for decomposing methane or odor-producing compounds, a biocover or biofilter including the composition, a method for decomposing methane or odor-producing compounds using the composition, a system for decomposing methane or odor-producing compounds using the biocover or biofilter, and the use of the strain for decomposing methane or odor-producing compounds. According to the present invention, methane and odor can be effectively removed concurrently, and thus the cost required for the separate treatment of methane and odor can be reduced, and methane and odor-producing compounds in landfills or the like can be effectively decomposed.

The invention belongs to the technical field of contaminated soil remediation and especially relates to an electrokinetic remediation method. The method comprises the steps that a positive electrolytic tank and a negative electrolytic tank are arranged within a certain distance, a cathode conditioning agent is added into the negative electrolytic tank, and an anode conditioning agent is added intothe positive electrolytic tank; wherein the cathode conditioning agent comprises acid-modified attapulgite, acid-modified kieselguhr and rhamnolipid; the anode conditioning agent is prepared from thefollowing components: iron-loaded modified attapulgite, iron-loaded modified montmorillonite, reduced iron, waste beer yeast, bacillus and sulfate reducing bacteria. According to the electrokinetic remediation method, pollutants in the soil can be efficiently removed, the pH of the cathode and the pH of the anode can be effectively controlled, the problem that the pH of the soil is unbalanced issolved, and the electrokinetic remediation method has high practical value and wide application prospects.

The invention discloses an anode structure for soil heavy metal treatment and a soil heavy metal treatment device. The anode structure comprises an anode monomer, wherein the anode monomer comprises agraphite carbon rod and a polytetrafluoroethylene net sleeve sleeving outside the graphite carbon rod; the polytetrafluoroethylene net sleeve is attached to the outer wall of the graphite carbon rod;and pores for blocking of soil and passing by of an electric pole liquid are left on the polytetrafluoroethylene net sleeve. The polytetrafluoroethylene net sleeve can prevent soil particles from directly contacting the graphite carbon rod, prevents the soil from adhering to the graphite carbon rod, enables the graphite carbon rod to retain a sufficient reaction area, and simultaneously enables an anode liquid to penetrate through the pores and contact the graphite carbon rod, thereby ensuring smooth conduction of the whole redox circuit.