75 results about "Contaminated land" patented technology

The invention relates to a method for remediation of volatile organic compound and mercury compound contaminated soil, and belongs to the technical field of soil contamination remediation. The method comprises the steps that the contaminated soil is firstly excavated out of a contaminated land parcel, and breaking and screening treatment is carried out; then ferric chloride powder is added into soil particles according to the proportion of 1 g/kg-10 g/kg, after even mixing and stirring are carried out, vacuum heat treatment is carried out, the temperature is firstly controlled to range from 250 DEG C to 300 DEG C, and mercury and a small quantity of volatile organic compounds in the soil particles are removed; then the temperature is controlled to range from 500 DEG C to 600 DEG C, the volatile organic compounds in the soil are removed, and condensed air is supplied into the atmosphere through a vacuum pump; and the treated clean soil is taken out of a vacuum reactor. According to the method, remediation of the volatile organic compound and mercury compound contaminated soil is achieved, and the technological process is simple, efficient and free of secondary contamination.

The invention relates to a method for optimizing contaminated soil restoration scope and boundary. According to the method, a relative coordinate system is established, a unit grid is located and subjected to grid processing, a dichotomy method is used to abandon or improve the optimization of the unit grid, a contaminated land area drawn according to a geostatistical analysis interpolation method is located in the unit grid, the optimized restoration boundary comprises multiple linear polylines, the measurement inflection point is greatly reduced, and meanwhile, the relative error of the restoration areas before and after optimization is controlled to be within a range from plus or minus 1% to plus or minus 5%. The method aims at the problems of artificial increase of the implementation difficulty of the restoration work and the relatively large measurement work amount caused by the universal low regularity, the curve boundary and the existence of a large quantity of inflection points in the restoration scope and boundary determined in a current ground investigation stage, the provided optimization method is relatively high in operability, and the optimum-determined restoration boundary can be conveniently restored after rapid measurement. The method is suitable for optimum determination of the soil restoration scope and boundary in the optimization design stage of contaminated site investigation and soil restoration work.

The invention relates to a soil treatment method for inhibiting the Cd/Pb absorption of rice in a contaminated farm land and belongs to the technical field of environmental contamination control and agricultural product quality safety. On a Cd/Pb contaminated land with Cd content of less than 5mgkg<-1> and Pb content of less than 500mgkg<-1>, a biomass carbon soil improvement material is spread on the surface of the contaminated land in an amount of 10 to 40 tha<-1> after harvesting previous crops, and uniformly mixed with soil in a cultivated layer. In the invention, the raw materials are rich, the cost is low, the operation is simple, the Cd/Pb content in brown rice is reduced effectively without influencing yield, and the inhibition effect on the Cd/Pb absorption of rice is remarkable.The biomass carbon soil improvement material is applied in an amount of 40 ton per hectare; and compared with the treatment without applying the biomass carbon soil improvement material, the Cd/Pb content in the rice seeds is reduced by 40 to 50 percent.

The invention discloses an effective degradation strain for phenanthrene Sphingobium sp. Phe-1 and application thereof. The bacterial strain is preserved at the China General Microbiological Culture Collection Center, the preservation number is CGMCC No.11239, and the preservation address is No.3, No.1 West Beichen Road, Chaoyang District, Beijing. The degradation strain Phe-1 has quite good degradation effect on the polycyclic aromatic hydrocarbon such as phenanthrene, and the degradation rate of 100 mg/L phenanthrene can reach 100% in 48 hours at the temperature of 35 DEG C and the pH of 7.0. The degradation strain is an effective degradation strain, and the degradation conditions are soft, the phenanthrene with the concentration less than 200 mg/L can be degraded at the temperature of 20-35 DEG C and the pH of 5-8. Moreover, the degradation strain has a wide applied range and good application prospect, is suitable for using as a restoration bacterial strain for contaminated land, and has a better degradation capability than the other degradation bacteria.

The invention discloses a contaminated land remediation method. The method comprises the following steps: screening soil, cleaning solid substances, washing by selection, performing solid-liquid separation, performing soil detection, performing electric flocculation water treatment, precipitating and performing filter-press solid-liquid separation, wherein in the step of washing by selection, toxic soluble heavy metal ions, pesticides, plant catalytic agents and soluble organic matters in the soil are dissolved in water; and in the electric flocculation water treatment, heavy metal ions and organic matters in the water are converted into solid substances by virtue of electrochemical reaction and are flocculated from the water, so that the heavy metal ions and the organic matters comprising the pesticides, bacteria and viruses in a filter-press aqueous solution are removed. The method disclosed by the invention has the technical effects that the heavy metal ions in cleaning water are effectively removed under the condition that any chemical is not added, the physicochemical characteristics of the original soil are reduced, the full-automatic operation can be realized, the water treatment time is reduced, the remediation efficiency is improved, and the remediation cost is reduced.

The invention discloses an environmental-friendly treating and screening device for contaminated soil. The environmental-friendly treating and screening device for contaminated soil comprises a feeding pipe, a stirring tank, a medicament adding tube, a pulverizer, a heater, a stirring motor, a revolving shaft, a stirring blade, an air collecting tank, an electrode bar, a screening box, a first sieve plate, a second sieve plate, a cam and a feed delivery pipe. The feeding pipe is arranged at the top end of the stirring tank. The pulverizer is arranged in the stirring tank. The medicament addingtube is arranged at the top end of the stirring tank. The heater is arranged on the inner wall of the stirring tank. The electrode bar is arranged in the stirring tank. The stirring motor is arrangedin a clapboard cabin. The top end of the stirring tank communicates with the air collecting tank through a breather pipe. The sieve plates are obliquely arranged in the screening box. The sieve plates are moveably connected with the inner wall of the screening box. The cam is arranged at the lower part of the sieve plates. The effect and efficiency of soil treatment are improved, and the environmental protection effect is improved. Soil is screened in classification, and soil with different particle sizes is used differently. The environmental-friendly treating and screening device for contaminated soil is simple in structure, convenient to use, and beneficial to popularizing.

The invention discloses an ex-situ chemical oxidation remediation method for cyanide-contaminated soil, and belongs to the field of contaminated land remediation. The method comprises the following steps: performing humidifying and uniform stirring on the cyanide-contaminated soil after being subjected to pretreatments such as impurity removal, crushing and screening, adding a double oxidant prepared from activated persulfate and hydrogen peroxide, and thoroughly mineralizing cyanide in the soil to convert cyanide into innoxious substances, so as to reduce the concentration of cyanide in the soil. According to the ex-situ chemical oxidation remediation method for the cyanide-contaminated soil, the double oxidant prepared from activated persulfate and hydrogen peroxide is used, so that the concentration of cyanide in the soil is effectively reduced, the secondary contamination risk of the cyanide-contaminated soil is eliminated, the soil after remediation can be used for backfill, the land use function is not affected, and normal development and utilization are feasible.

The invention provides an endophyte for promoting the growth of plants and the remediation of heavy metal-contaminated soil and application thereof. Bacterial liquid of endophyte SLS18 is utilized to dip-dye Sorghum bicolor L. in a mode of seed bacteria dipping to colonize the endophyte SLS18 into the Sorghum bicolor L. to accompany each stage of the growth of the Sorghum bicolor L., so that the growth of the Sorghum bicolor L. on heavy metal-contaminated marginal land and the remediation of soil are promoted. The endophyte SLS18 is separated from the stem of a hyperaccumulator, namely pokeberry root, is obtained through screening, and is an endophyte which can be successfully colonized in the Sorghum bicolor L., has a remarkable effect of promoting the growth of the Sorghum bicolor L. and has the heavy metal resistance. A method is easy to operate, and is safe and economic, no new pollution is introduced into soil environment, heavy metal-contaminated marginal land resources can be effectively utilized so as to avoid the rival of energy crops and food crops against finite cultivated land, and heavy metal-contaminated land can also be effectively remediated.

The invention relates to a process control and monitoring system used for in situ bioremediation of contaminated land, which comprises a gas injection system, a gas extraction system, a liquid injection system, a monitoring system and a PLC (programmable logic controller) system; wherein the monitoring system comprises a temperature sensor, a gas composition monitor and a humidity sensor; the operating result of the gas injection system is displayed on the temperature sensor and the gas composition monitor; the operating result of the gas extraction system is displayed on the temperature sensor and the gas composition monitor; the operating result of the liquid injection system is displayed on the temperature sensor and the humidity sensor; and the monitoring system is connected to the PLC system and is controlled by the PLC system. The process control and monitoring system disclosed by the invention is easy to operate, reduces the labor input, improves the automation degree of the whole project, can meet the requirement that input material is reasonably distributed during the process of wide-range governance of heterogeneous contaminated land, thereby improving governance efficiency and effect while reducing the operating cost.

The invention discloses a method for remedying heavily oil-contaminated soil, and belongs to the technical field of polluted soil treatment. The method comprises the steps that 1, a surfactant is spread to a heavily oil-contaminated land parcel, the surface layer soil on the land parcel is shoveled away and stacked, animal excrement, crop straw, bentonite, urea and first oil decomposing bacteria are added for fermentation; 2, the land parcel with the surface layer soil shoveled away is turned over for 25-40 cm, water is evenly spread to reach the soil humidity being 50-65%, the pH of soil is adjusted to 7-10, second oil decomposing bacteria is added to the turned-over land parcel, alfalfa is planted on the turned-over land parcel, and the 2-3 crops of alfalfa are harvested and added into afermentation heap in the step 1 for fermentation; and 3, fermentation products in the step 1 are granulated in a granulation machine to form organic fertilizer to be spread to the alfalfa planting area. A bioremediation and phytoremediation cyclic degradation mode is formed, and the method is economical, environmentally friendly and good in remedying effect.

The invention discloses a growing culture medium for ecological remediation and a preparation method thereof. The growing culture medium comprises the following raw materials in parts by weight: 5-12 parts of lutein ester, 11-19 parts of lignocellulose, 7-15 parts of algin, 28-36 parts of straw powder, 15-25 parts of tartaric acid, 20-30 parts of variegated-leaf begonia and 1-5 parts of propyl acetate. The preparation method comprises the following steps: mixing the variegated-leaf begonia, the tartaric acid and deionized water, heating, performing ultrasonic treatment, mixing with the lignocellulose and the propyl acetate, heating, and performing ultrasonic treatment to obtain a mixture B; adding deionized water and the tartaric acid into the straw powder, heating, and performing ultrasonic treatment to obtain a mixture C; mixing the mixture B and the mixture C, adding the remaining materials, heating, and stirring till a dry state to obtain the growing culture medium. The growing culture medium can effectively improve soil, play water-retaining and fertilizer-retaining roles, improves the growth environment for plants, can provide nutrients immediately, can activate heavy metals which cannot be dissociated from the soil so as to promote heavy metal absorption of the plants, and can be applied to the fields of ecological remediation for a mining area, heavy metal-contaminated land remediation, slope remediation and the like.

The invention belongs to the field of environmental microorganisms, and particularly relates to a production method of efficient phosphorus-dissolving epicoccum sorghinum with the characteristic of resisting heavy metals. Through classification, the epicoccum sorghinum is identified. The production method includes the steps that copper tailing soil and sterile water are cultured in a mixed mode, and a heavy metal sterile mixed solution with the concentration suitable for the growth of thalluses is screened; repeated culture is conducted for six times; fourth-time culture liquid, fifth-time culture liquid and sixth-time culture liquid are sucked and added into culture mediums containing organic phosphorus and inorganic phosphorus for plate spread culture, culture dishes with a large numberof bacterial colonies are selected, plate streaking culture is conducted in the culture mediums containing the organic phosphorus and the inorganic phosphorus, and the bacterial colonies with obviousphosphorus-dissolving rings are screened; and culture purification results are subjected to shake cultivation, and finally screening purification is conducted to obtain phosphorus-dissolving bacterialstrains resisting the heavy metals. Efficient phosphorus-dissolving funguses resisting the heavy metals are screened from contaminated land, the soil phosphorus supply and demand contradiction can beadjusted, reclamation land soil in a mining area is improved, vegetation growth is promoted, the utilization ratio of heavy metal contaminated plowland soil phosphorus by crops is increased, and useof fertilizer is reduced.

The invention relates to an in-situ rapid remediation method for cadmium contaminated cultivated land based on microbial conversion. The method comprises the steps that earth dams and drainage ditches are built around the cadmium contaminated cultivated land, and then liquid collecting tanks communicating with the drainage ditches are built; seepage control thin films are paved at the bottoms and side walls of the drainage ditches and the collecting tanks; then enlarging-cultivated microbe enriched bacteria liquid is sprayed into the cadmium contaminated cultivated land, and fully and uniformly mixed with the land by adoption of agricultural land ploughing equipment; liquid obtained after natural settling flows through the drainage ditches to be collected into the liquid collecting tanks, and a cadmium-containing solution is obtained; cadmium ions in the solution are subjected to adsorption treatment in the collecting tanks; and finally the remediated land is washed to be neutral by means of non-contaminated water. Compared with a traditional method of remediating the cadmium contaminated land in a physical, chemical and plant mode, the process is short in remediation period, large in treated contaminated area, low in cost, and not prone to causing secondary pollution to the land; and the process method has the advantages of being environmentally friendly, economical and the like, and has wide application prospects in the field of cadmium contaminated land fast remediation.

A method of restoring contaminated land, for example landfill (12), comprises covering the surface of the land with a substantially uninterrupted layer of a composition including pulverised fly ash mixed with lime, the preparation creating a pozzolanic pan (14). At least one soil horizon comprising varying mixtures of pulverised fly ash, biochar and secondary treated sewage sludge or other organic material is laid over the pozzolanic pan (14).

The invention relates to a microbial multifunctional soil improver and a preparation method thereof. The microbial multifunctional soil improver comprises the components of microbes, a biogas slurry,expanded perlite (or ceramsite with pores in the surface) and perlite powder. An organic fertilizer is combined with a microbial improver and the expand perlite (or the ceramsite with the pores in thesurface) is used as a microbial carrier so as to improve the soil environment, provide protection for the microbes, achieve resource utilization of the biogas slurry and the like. Through a synergistic effect of various microbes, the purposes of promoting the growth of plant roots, enhancing the absorption capacity of the roots, inhibiting the propagation of pathogenic bacteria inside and outsideplants, reducing pests and diseases, reducing pesticide residues, inhibiting the growth and the propagation of the pathogenic bacteria, increasing organic matters in soil, and remedying organic matter and inorganic matter contaminated soil and the like are achieved. The novel microbial multifunctional soil improver can remedy the contaminated soil, improve a poor soil condition and increase the soil fertility, and has a very great research value and a very great application potential.

The invention discloses a method for restoring cyanide contaminated soil by using a low-temperature heat treatment technology. According to the method, the cyanide contaminated soil is used as a research object, common cyanides in the field soil are used as target contaminated substances, and thermal decomposition is carried out on the cyanides by using the low-temperature heat treatment technology, so that the uttermost removal of the cyanides in the soil is efficiently and safely achieved, and the treated soil meets the national "exhibition land soil environment quality evaluation standard HJ350-2007" grade-B standard; the cyanide contaminated land soil is restored by adopting the low-temperature heat treatment technology, so that the removal rate of the cyanides can reach 99% or above,and the degradation rate can reach 97% or above; the method aims at the medium-and-high-concentration cyanogen-containing soil, and the advantages that the efficiency is high, the time is short, and no secondary pollution occurs are achieved; the damage to the physical and chemical properties and the natural fertility of the treated soil is small, so that the situations that the soil can be backfilled after being treated and the agricultural production is restored become possible; and powerful technical support is provided for comprehensive treatment and safety reutilization of a cyanide contaminated site.

The invention discloses a bioremediation process for soil contaminated by landfill leachate, and belongs to the technical field of soil bioremediation. The bioremediation process for the soil contaminated by the landfill leachate comprises the steps of analysis of contaminated soil, plant cultivation, animal breeding, microorganism cultivation, transplanting and transportation, putting for contaminated land, supplementation and maintenance and soil re-utilization. Cultivation soil can be transferred to the soil of the contaminated land through a degradable transplanting device, the degradabletransplanting device can be automatically degraded under the effects of microorganisms and has no adverse impact on the environment, three soil bioremediation technologies of phytoremediation, animalremediation and microbial remediation can be comprehensively utilized for remediation of the soil contaminated by the landfill leachate, the three soil remediation technologies can promote one anotherto exert the best effect, and the improvement of the remediation effect is facilitated; compared with other soil remediation technologies, the labor and equipment investment can be reduced, and the treatment of soil contamination of complex types is better facilitated.

The invention relates to the technical field of microbe applications and in particular relates to a microbial agent, a greening waste soil remediation agent as well as a preparation method and application thereof. Each milliliter of the agent comprises 1*10<10-12> trichoderma asperellum WL spores, 1*10<10-12> geobacillus stearothermophilus viable spores and 1*10<10-12> CFU bacillus amyloliquefaciens. The agent comprises the trichoderma asperellum WL separated by the inventor, and the strain has an effect of enriching heavy metal materials, has a cellulose degradation function and can be well used for greening waste degradation and soil remediation. The invention further provides a greening waste soil remediation agent. The greening waste soil remediation agent can achieve the effects of overcoming the absorption and digestion difficulty of the conventional urban greening wastes, remediating salt and alkali lands and removing heavy metals and petrochemical pollution sources in contaminated lands.

The invention discloses a comprehensive apparatus for restoring and improving contaminated soil. The apparatus comprises an apparatus main body and a water collecting apparatus arranged inside the apparatus main body, wherein the water collecting apparatus comprises a first hollow cavity which is arranged inside the apparatus main body and has an upward opening, the circumferential side arc innerwall of the first hollow cavity is fixedly provided with partition blocks, the interior of each partition block is provided with a first through hole penetrating up and down, the interior of the lowerinner wall of the first hollow cavity is provided with a second hollow cavity in a communication manner, the interior of the second hollow cavity is a rotationally provided with a first slide block which extends upwards, the first slide block passes through the first through holes, the interior of the first slide block is provided with a third hollow cavity, and the interior of the third hollow cavity is rotationally provided with a first lead screw. The apparatus is designed to automatically store rainwater on rainy days, capture and store water molecules in the air during long-term drying,and automatically irrigate plants at regular intervals.

The invention discloses a restoration device for contaminated soil. The restoration device comprises a liquid storage tank and a main box body, wherein the liquid storage tank is horizontally arrangedabove the main box body; the inner bottom of the liquid storage tank and the inner top of the main box body communicate with each other through a guide tube; a liquid inlet is formed in the inner topof the liquid storage tank; a box cover is in threaded connection in the liquid inlet; a rotary rod is rotatably connected in the liquid storage tank; a plurality of stirring rods are fixedly connected on the rotary rod; one end of the rotary rod penetrates through the inner wall of the liquid storage tank, and is fixedly connected with a handle; a drive motor is arranged at one side of the mainbox body; the output end of the drive motor is fixedly connected with a transmission rod; one end, away from the drive motor, of the transmission rod penetrates through the outer wall of the main boxbody and extends inwards; and one extending end of the transmission rod is rotatably connected with a supporting rod. According to the restoration device disclosed by the invention, the liquid storagetank and the main box body are arranged, so that the device is relatively small in size, and is convenient in movement and use, and therefore, soil restoration efficiency is guaranteed.

The invention discloses a chromium-contaminated land remediation method. The method comprises the following steps: 1, inoculating a sterilized liquid culture medium with a Bacillus sp. strain, performing culturing to obtain a bacterial stock solution, and adding normal saline into the bacterial stock solution to dilute the bacterial stock solution to make the OD600 value be 0.8-1.5; 2, taking anduniformly mixing an aqueous urea solution and an aqueous calcium chloride solution to obtain an adhesive solution; 3, mixing the bacterial solution prepared in step 1 with the adhesive solution prepared in step 2 to obtain a reaction solution; 4, taking chromium-contaminated soil, removing impurities, and air-drying, crushing and sieving the soil; and 5, uniformly pouring the reaction solution prepared in step 3 into the pretreated soil obtained in step 4, and then carrying out constant-temperature culture for 20-40 d. The restoration remediation method can reduce Cr<6+> into Cr<3+>, and the reduction rate can reach 98%.