5119 results about "Soil remediation" patented technology

Freeze wells may be used to isolate an area for soil remediation. Freeze wells may form a frozen barrier around a treatment area. The frozen barrier may inhibit fluid from entering into the treatment area. The frozen barrier may also inhibit migration of contamination out of the treatment area. The frozen barrier may be used to surround all of the perimeter of the treatment area. A frozen barrier may also be formed above or below a treatment area. Freeze wells may be activated in advance of soil remediation so that a frozen barrier is formed when soil remediation is begun. The soil remediation may be accomplished by any type of soil remediation system, including a thermal soil remediation system. Heaters of a thermal soil remediation system may be may be placed close to the frozen barrier without the barrier being broken through during remediation.

The invention relates to a soil pollution thermal desorption restoration processing system, which belongs to a soil restoration processing system. The system comprises a feed system, a heat source system and a control system, and is characterized by further comprising a thermal desorption system and a tail gas processing device, wherein the thermal desorption system consists of a draught fan and a thermal extraction converter, and the tail gas processing device consists of a dust remover and an absorption tower. When the system is applied to processing polluted soil with main pollutants of volatile/semi-volatile organic compounds, compared with the like products in other countries, the equipment cost is only 1/3 to 1/5 of the same; the problem of secondary pollution probably brought about in the process of processing the polluted soil is thoroughly avoided; a temperature control system has better practicability; the running cost for each ton of the polluted soil is between 300 and 500 RMB, which is far low than the processing cost for hazardous landfilling and incineration of the polluted soil; and half of the purification effect of processing the polluted soil with the main pollutants of the volatile/semi-volatile organic compounds can reach between 70 and 80 percent.

The invention discloses slow-release fertilizer with the effect of soil remediation, which is prepared by polyhydroxyalkanoates which can be completely biodegraded, organic and inorganic nutrients and other substances, by slow-releasing the organic and inorganic nutrients, microorganism propagation and sustained and rapid growth of plants can be promoted, the bioactivity and water solubility of polycyclic aromatic hydrocarbons are quickened, and simultaneously, the defects of fertilizer loss and repeated fertilization can be avoided, thereby saving the cost and enhancing the soil remediation efficiency. The invention also discloses a soil pollution remediation method by utilizing the slow-release fertilizer, plants with the remediation effect are planted in the soil with the slow-release fertilizer, and efficient, environment-friendly and sustained remediation of the soil polluted by the polycyclic aromatic hydrocarbons (PAHs) can be realized by utilizing the microorganism-plant remediation technology.

The invention relates to a method for remediation of heavy metals contaminated soil by a plant-microorganism joint direction method. The detailed steps of the method of the invention are that: firstly, resistant bacteria of plant and microorganism is sifted, so as to obtain plant and microorganism bacteria strains with heavy metal resistance; and then the seeds of the resistant plant is soaked and coated in microorganism resistant bacteria solution; finally, the seeds are planted in the soil contaminated by heavy metal, therefore the soil can be remedied. The method has the advantages of good remediation effect, low cost, easy management and operation, no secondary pollution and broad application prospect, therefore, the method is the most important development direction of soil remediation technique.

The invention relates to a method for repairing contaminated soil, and aims at providing a method and a device for repairing contaminated soil with persistent organic pollutants. The device comprises a separator, a material hopper, a material feeder and an indirect-heating thermal desorbing device which are connected with one another in sequence, wherein a soil emission device is connected to the bottom of the heating thermal desorbing device; a combustion system, a waste heat utilization device and an inert gas generator are respectively connected with the indirect-heating thermal desorbing device; the combustion system is connected with an outer barrel, and the inert gas generator is connected with an inner barrel; and a tail gas processing component comprises a cyclone dust extractor, a primary spray tower, a secondary regulating spray tower, a dehumidifier, a plasma reactor, an air filter, an induced draft fan and an exhaust barrel which are connected with one another in sequence. According to the method and the device for repairing contaminated soil with persistent organic pollutants disclosed by the invention, the amount of exhaust gas needing processing is less, water consumption is low, the persistent organic pollutants are thoroughly removed, the operation cost is reduced by 30%-60%, and the contaminated soil with persistent organic pollutants can be economically and effectively processed.

The invention relates to a stable curing agent of repairing heavy metal and toxic organic matter combined polluted soil. The stable curing agent comprises the following raw materials in percentage by weight: 10-30% of cement, 10-30% of coal ash, 20-50% of clays, 2-10% of an activating agent and 2-20% of an oxidizing agent, wherein the activating agent is a composition of one or more than two of magnesium oxide, aluminum oxide, titanium dioxide or molybdenum trioxide, and the oxidizing agent is a composition of one or more than two of sodium persulfate, calcium peroxide, potassium persulfate and ammonium persulfate. The raw materials are put into a grinder to be uniformly grinded and mixed to prepare the stable curing agent with the specific surface area of 400-800/kg. The stable curing agent provided by the invention has the characteristics of low cost, good soil repairing effect and simplicity in construction.

The invention discloses a preparation method of a functional organic fertilizer for soil restoration. The method comprises the following steps: mixing crushed straws with blue-green algae according to the mass ratio of (1-5):10 to obtain a mixture, and then adding a biomass-transformed complex microbial inoculant and a biomass-transformed inductive material to the mixture; evenly mixing and then carrying out conventional stacking fermentation for 5-15 days, so as to obtain a semi-solid organic fertilizer; and mixing and pelletizing the semi-solid organic fertilizer, clay, biomass carbon ash and a heavy metal ion chelating agent according to the ratio of 1000:(50-200):(50-150):(1-5), so as to obtain the functional organic fertilizer for soil restoration. The organic fertilizer disclosed by the invention has a persistent slow-release fertilizer effect, and can adsorb, chelate and immobilize the heavy metal ions in a deactivation manner, soil fleeciness is facilitated, the moisture retention and the breathability are improved, rooting of plants is facilitated, formation of beneficial components of soil microelements and the like is optimized, the heavy metal-polluted soil is effectively restored, and secondary pollution of the soil is not caused.

The invention discloses a heavy metal contaminated soil conditioner and a plant and chemistry combined remediation method. The heavy metal contaminated soil conditioner is a mixture of red mud and slaked lime. In the invention, the plant and chemistry combined remediation method is used, the pH of the soil is regulated by a chemical method, and heavy metals in the soil are absorbed by planting energy crops, hyperaccumulative plants and the like, thereby improving the soil properties, gradually reducing the content of heavy metals in the soil, finally achieving the purpose of soil remediation, improving the plant remediation efficiency, and being favorable to large-scale commercial application.

A stabilizer suitable for heavy metal contaminated soil and an application method thereof belong to the technical field of contaminated soil remediation treatment. The invention is characterized in that: the soil stabilizer comprises the following components by mass: 5%-8% of heavy metal chelants, 10%-20% of gelled materials, 50%-65% of clay mineral, 10%-15% of alkaline excitants; the gelled material, clay mineral and alkaline excitant are mixed and grinded to obtain a Blaine specific surface area of 5000-8000 cm2/g; the mixture is sieved by a 200-mesh sieve, and the water content is less than 3%; the heavy metal chelant is prepared into a solution by water with a mass percent of the chelant being 20%-40%. The stabilizer and soil are uniformly mixed, and conserved for above 5 days. The main components of the stabilizer are mostly natural materials; after the stabilizer is used, heavy metal contaminants in soil can be rapidly and effectively stabilized, and the toxicity of the contaminants is reduced. The materials used are economical and easily available, and do not cause secondary contamination, and the stabilizer is a rapid and high-efficient stabilizer for heavy metal contaminated soil.

The invention relates to a multi-stage thermal desorption remediation system for organic polluted soil, and belongs to the technical field of soil remediation. The system consists of a first-stage thermal desorption device, a second-stage thermal desorption device, a tail gas treatment device, a secondary combustion chamber and a falling type conveying belt. Soil is preheated and desorbed primarily by high-temperature tail gas generated by thermal desorption; a two-stage or multi-stage polluted soil treatment method is adopted, and the residual heat of the tail gas is utilized fully, so that the comprehensive utilization ratio of heat energy of the system is improved obviously; soil enters a thermal desorption cabin with relatively high temperature under the gravity effect by virtue of the S-shaped falling type conveying belt, so that the energy consumption of a conveying and transmitting device and the conveying process is prevented; meanwhile, the soil conveying path and the conveying time are prolonged, the retention time is prolonged, and thus soil pollutants are desorbed relatively fully. The thermal desorption soil remediation system is reasonable in structure, is simple to operate, is convenient to use, has no secondary pollution, recycles residual heat of tail gas, and has wide application prospect and high practical value.

The invention provides an environment-friendly remediation vehicle with the soil turning function for municipal garden soil, and belongs to the technical field of soil remediation devices. The environment-friendly remediation vehicle comprises a vehicle body, wheels and a first motor and is characterized in that a cab is arranged at the upper part of the vehicle body. According to the environment-friendly remediation vehicle, a spiral soil loosening device is arranged so that the soil can be subjected to soil loosening treatment, the loosened soil enters the interior of the vehicle body through a soil collecting shovel along with the forward movement of the vehicle body and is conveyed to the interior of a soil crushing device through a conveying device, and the soil is subjected to secondary crushing and dehydration treatment; the soil is conveyed into a spiral mixing device through a slope type soil collecting and conveying device and is fully mixed with remediation liquid, in addition, spraying faucets arranged below a first slope type conveying plate in the slope type soil collecting and conveying device are arranged so that the remediation liquid can be uniformly sprayed intothe flowing soil, and the mixing effect can be improved; and along with the forward movement of the vehicle body, through the arrangement of a soil turning device, the soil in the deep layer is turnedto the ground surface so that the remediation depth of the soil remediation vehicle can be increased.

The invention discloses a carbon-based composite material for arsenic and cadmium polluted soil remediation and application of the composite material. The carbon-based composite material disclosed by the invention is prepared by the steps: taking crop straws as raw materials, and charring to prepare charcoal; mixing with an iron salt solution according to a certain solid-liquid ratio, regulating the pH value of the solution in the process so as to realize coprecipitation of the two materials; performing pyrolysis, thereby obtaining the carbon-based composite material. The carbon-based composite material prepared in the invention is applied to arsenic and cadmium compound polluted soil, and methods such as turning over, watering and the like are combined, so that the content of arsenic and cadmium in an effective state can be obviously reduced; therefore, the arsenic and cadmium in the soil can be transferred to a direction with low biotoxicity and migration, the physicochemical properties of the soil can be improved to a certain degree, and the composite material is suitable to be applied to multiple types of soil. The arsenic and cadmium ions in a water body can be effectively removed, the preparation process is simple in operating steps, and the material is wide in source, low in production cost and environment-friendly.

The invention discloses an electrodynamic and drop-irrigation combined heavy-metal-polluted soil remediation method. The method comprises the following steps of: mounting positive and negative electrodes at the two ends of heavy-metal-polluted soil, wherein the positive and negative electrodes are made from carbon fibers; respectively placing adsorbents between the positive electrode and the polluted soil and between the negative electrode and the polluted soil; placing a drop irrigation device above soil close to the absorbents; slowly dropwise adding electrolyte, buffer solution or a complexing agent and the like into the polluted soil at the two sides, and carrying out periodic polarity switching, wherein heavy metal moves under the action of electric migration and is adsorbed by the adsorbents, thus concentration of the heavy metal in the soil is reduced. According to the invention, drop irrigation technology is applied to polluted soil electric remediation, a complex anode chamber, a complex cathode chamber and an electrolyte circulating system in the traditional electrodynamic remediation are not used, a proper amount of drop irrigation liquid is reserved in the soil, electrolyte and secondary pollution are effectively avoided, and the method disclosed by the invention has the advantages of simple structure, operation convenience, practicability, effectiveness and the like.

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.

Methods are provided for remediating contaminated soil. The methods may include collecting contaminated soil at a plurality of treatment sites. The contaminated soil at one or more of the plurality of treatment sites may be at least partially contained. The method may include heating soil at a first site with a plurality of heat sources to substantially reduce contamination of the soil at the first site. Soil at a second site may be heated using a plurality of heat sources. A portion of vapors produced from the second site may be allowed to enter the substantially uncontaminated first site. Contaminants within the portion of vapors produced from the second site may be at least partially destroyed at the first site.

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 discloses preparation and an application for a heavy metal chromium contaminated soil remediation material. Preparation for biological carbon particles comprises the following steps: 1) cleaning, drying and crushing agriculture waste to obtain a substance A; and 2) placing the substance A under a protective atmosphere to deoxidize and carbonize, and grinding and sieving carbonize products to obtain the biological carbon particles. Preparation for supported type nano zero-valent iron particles comprises the following steps: 1) preparing ferrite into a solution; 2) adding biological carbon particles into the solution, and uniformly mixing the biological carbon particles with the solution; and 3) dissolving a reducing agent into a solvent to obtain a mixture, adding the mixture into the system in the last step under the protective atmosphere, stirring the mixture, sufficiently reacting the mixture, separating nano zero-valent iron, washing, drying and grinding the nano zero-valent iron to obtain the supported type nano zero-valent iron particles. The invention further discloses the application of the supported type nano zero-valent iron particles to remediating chromium contaminated soil in situ. The in-situ remediation method for the heavy metal chromium contaminated soil comprises the following steps: adding the supported type nano zero-valent iron particles into soil, uniformly mixing the supported type nano zero-valent iron particles, adding deoxygenated water, and carrying out remediation. The remediation material prepared by the preparation disclosed by the invention is high in efficiency of remediating the chromium contaminated soil, and capable of improving the soil structure and improving the soil fertility.

Belonging to the field of soil remediation, the invention relates to a biomass charcoal based soil remediation agent, which includes a photocatalytic oxidant and a carrier. The photocatalytic oxidant is titanium dioxide, and the carrier is biomass charcoal. The invention also relates to a preparation method of the biomass charcoal based soil remediation agent. The method comprises the steps of: A. material crushing; B. preparation of a biomass material; and C. preparation of the biomass charcoal based soil remediation agent. The biomass charcoal based soil remediation agent provided in the invention is a novel soil remediation agent, and is especially suitable for remediation of soil contaminated by organic matters. The biomass charcoal has the capacity of adsorbing organic pollutants in soil, and titanium dioxide has characteristic of photocatalytic oxidation degradation of organic matters. Thus, titanium dioxide can degrade organic pollutants adsorbed on the biomass charcoal surface. The preparation method of the biomass charcoal based soil remediation agent provided in the invention has the advantages of convenient preparation, simple conditions, safety and reliability.

The invention relates to a soil remediation and sewage purification integrated ecological treatment device. In the device, constructed wetland is surface flow constructed wetland and sequentially comprises a surface soil layer, a deep treatment layer, a draining layer, a filter layer and a water guide layer from top to bottom, wherein the surface soil layer is composite soil formed by mixing soilinfected by heavy metal, a zeolite molecular sieve and bentonite; the deep treatment layer is iron carbon filler; the draining layer is gravel; the filter layer is non-woven fabric; upper and lower layers of gravel fillers are paved on the water guide layer and the middle part of the water guide layer is separated by the non-woven fabric; an alkaline injection device is arranged at the water inlet end of the constructed wetland and used for controlling the pH value of the constructed wetland and preventing the heavy metal in the constructed wetland from being separated out; an aeration disc is arranged at the bottom of an integrated ecological pool; a water distributor is arranged above the aeration disc; flowing fillers are filled in the integrated ecological pool; an artificial ecological floating bed is floated on the surface of the pool; and a water outlet of the constructed wetland is connected with the integrated ecological pool through a pressure pump. The device performs soil remediation and sewage purification and makes the soil remediation process simple and practical.

An in situ soil remediation system may be used to remove or reduce levels of mercury contamination within soil. The soil remediation system may also remove or reduce levels of other contaminants within the soil. Mercury may be vaporized within the soil by a heating system. The vaporized mercury may be removed from the soil by a vacuum system. The vaporized mercury may pass through heated risers that elevate the vaporized mercury. After the vaporized mercury passes from the heated risers, the vaporized mercury may be allowed to cool, condense, and flow downward to a treatment facility. Removing mercury from the soil as a vapor may provide an economical, safe, and efficient way to remediate mercury contaminated soil.

The invention relates to a remediation method of heavy metal contaminated soil, and the method comprises the following steps of: building a water collecting ditch around the heavy metal contaminated soil, and paving an impermeable membrane on the bottom of the water collecting ditch; building a water collecting tank communicated with the water collecting ditch, and paving impermeable membranes on the bottom and side walls of the water collecting tank; spraying acid leachate to the surface of the heavy metal contaminated soil, wherein the acid leachate permeates into the water collecting ditch through the heavy metal contaminated soil and gathers in the water collecting tank to obtain heavy metal-containing leachate; performing leaching remediation on the heavy metal contaminated soil by use of the heavy metal-containing leachate until the measured content of heavy metal in the heavy metal contaminated soil does not change; and leaching the heavy metal contaminated soil with clean water until the soil is neutral. The method provided by the invention is widely applicable and has the advantage of large processing capacity. After the soil remediation is finished, the method also can be used for performing microbial remediation and phytoremediation on the soil not reaching the state-specified standard in terms of heavy metal content.

The invention discloses a preparation method of a nanometer Fe(0)-porous sludge carbon material. The method includes: taking iron salt as an iron source of nanometer Fe(0), taking sludge as a precursor for thermal reduction of porous carbon and iron salt, taking an organic matter capable of generating a great quantity of gas by thermal decomposition at 300-500 DEG C as a pore forming agent, taking waste organics as a carbon regulating agent (in order to solve the problem of difference of organic carbon composition of sludge different in source), taking water as a harmonizing agent, and performing pyrolysis carbonization and thermal reduction at 500-900 DEG C to obtain the nanometer Fe(0)-porous sludge carbon material being 0.01-100micron in pore diameter, wherein Fe(0) average particle size is 30-80mm. The nanometer Fe(0)-porous sludge carbon material is effective in dechlorination and toxicity reduction and has a promising application prospect in various environmental pollution control fields including dehalogenation reduction, soil remediation, heavy metal wastewater treatment, printing and dyeing wastewater treatment and/or anaerobic wastewater treatment and the like, and sludge recycling and 'using waste to treat waste' are realized.