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2711 results about "Contaminated soils" patented technology

System for restoring organic contaminated soil through in-situ electrical heating and treatment method

The invention provides a system for restoring organic contaminated soil through in-situ electrical heating. The system comprises an infrastructure technology, an electronic control system, a gas treatment system, a monitoring and data acquisition system and a repairing effect comprehensive assessment system. The infrastructure technology comprises heating well and extraction well construction, ground compaction and insulating layer construction technologies; heating wells are distributed on a contaminated site according to a triangle arrangement principle and a proximity principle, and the extraction well is arranged in the geometric center of the layout of the heating well; the gas treatment system is composed of a pre-cooling adsorption sledge, an extraction sledge and a treatment sledge, and is used for completing gas extraction and treatment and achieving the tail gas discharging requirement; and the repairing effect comprehensive assessment system evaluates the temperature risingeffect of the contaminated soil in the restoring process and the treatment effect of the contaminated soil. According to the system, the technological route is complete, the soil property applicability is wide, the heating temperature can reach 500 DEG C or above, and volatile and difficult-to-volatilize organic contaminant can be treated at the same time.
Owner:BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION +1

Method for treating contaminated soil by combining in-situ heat strengthening and soil vapor extraction technology

The invention discloses a method for treating contaminated soil by combining in-situ heat strengthening and a soil vapor extraction technology, which is characterized in that a heating well with a certain form is formed in a contaminated area, a heater part is provided in the heating well, and a sleeve pipe is installed, a catalyst is filled in the sleeve pipe for accelerating the high temperature decomposition of the pollutant into simple micromolecular substances. At least one well bore is drilled at the central contaminated area of the heating well which is arranged in the certain form to form an extraction well, a vacuum system is provided for realizing the extraction of the contaminated tail gas. the heating well provides heat to contaminated soil of the heating well and the adjacent areas through the thermal conductivity of the heater part arranged in the heating well, soil is heated, the soil pollutant is subjected to processes of evaporation, in-situ pyrolysis, oxidation, combustion, distillation and the like to form tail gas like simple micromolecular gas, water and pollutant steam, then the tail gas is extracted by the vacuum system in the extraction well, and is connected to a tail gas collection pipeline of the extraction well to send to the ground surface, the pollutant in tail gas is treated through a pollutant treatment facility which is installed on the ground surface. The method also comprises an impervious sealing plate which is arranged on the contaminated soil area ground surface for minimizing the gas exchange of the heating well, the extraction well and atmosphere, and preventing the pollutant from entering in atmosphere to form secondary pollution, and a thermal insulation layer is arranged above or below the impervious sealing plate for avoiding the dissipation of heat.
Owner:TIANJIN ECOLOGY CITY ENVIRONMENTAL PROTECTION +1

Stabilized curing agent for heavy metal contaminated soil or solid waste treatment and treatment method

The invention discloses a stabilized curing agent for heavy metal contaminated soil or solid waste treatment and a treatment method. The stabilized curing agent comprises the following components in parts by weight: 5 to 10 parts of a magnesium-based compound, 1 to 5 parts of a sulfur-based compound and 1 to 3 parts of an activated silicon-based compound. The treatment method comprises the following steps of sampling inspection, experimental determination of adding proportion, mixing, backfill maintenance, sealing up for safekeeping and the like. The stabilized curing agent disclosed by the invention has an efficient long-term stabilizing effect on various heavy metals such as arsenic, mercury, hexavalent chromium, lead, cadmium, nickel, tin and cyanide, the repeated acid and alkali leaching experiments prove that the stabilized and cured harmful heavy metals cannot be dissolved out again, and the defects that in the traditional technology, the treatment effect and treatment agents are greatly affected by the environment, the long-term efficacy of harmless stabilization is poor, the medicament adding amount is difficult to control and the re-dissolution of harmful heavy metals is easily caused by the high alkalinity of cement solidification and the like are overcome.
Owner:GUIZHOU MEIRUITE ENVIRONMENTAL PROTECTION TECH

In-situ biological repairing method for biomass intensified petroleum contaminative soil

The invention discloses an in situ bioremediation method for strengthening the petroleum contaminated soil by biomass which belongs to the environment restoration technique. The method utilizes the biomass added with biomass degradation fungi to promote the conversion of biomass in polluted soil. The intermediate product transformed by biomass in soil is utilized to serve as the preferential carbon source of the petroleum hydrocarbon degradation complex bacteria for promoting the biological accumulation of the petroleum hydrocarbon degradation complex bacteria; meanwhile, the imposed petroleum hydrocarbon degradation complex bacteria contains the fungus that can produce biological surface active agent efficiently, the fungus produces abundant biological surface active agent during growth to activate the petroleum hydrocarbon pollutants in polluted soil for increasing the biological utilize degree, thus promoting the biotransformation efficiency of the petroleum hydrocarbon degradation complex bacteria to pollutants. Humus of the transformation product of the biomass in the soil can also improve the granular structure of the soil, and increase the fertility of the soil, so the polluted soil can be restored. The method is simple and is easy to operate and promotion.
Owner:CHINA PETROLEUM & CHEM CORP +1

Method and device for repairing contaminated soil with persistent organic pollutants

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.
Owner:ZHEJIANG UNIV

Ectopic classification leaching repair complete process of arsenic and heavy metal contaminated soil

ActiveCN104889149ASolve the regeneration problemSolve the recycling problemContaminated soil reclamationCyclonePrill
The invention discloses an ectopic classification leaching repair complete process of arsenic and heavy metal contaminated soil. The repair process comprises the following steps: the contaminated soil is magnetically separated to extract and recover target metals; a nonmagnetic component is divided into three grades by a vibrating screen after being primarily crushed; stones and boulders are flushed by clear water to directly serve as building materials; thick and fine soil particles obtained through screening respectively enter second-grade leaching mixing equipment for washing; the solid-liquid separation is performed for mud generated by washing through a two-stage hydraulic cyclone device; leaching waste liquid is purified and regenerated for recycling; sludge is added with such repair materials as curing/stabilizing agents for safety treatment after being dehydrated; and after the treatment, the soil particles can be backfilled, or can serve as roadbeds, building materials and the like. Based on the characteristic of large difference of arsenic and heavy metal contents in soils with different particle sizes, the soil leaching treatment according to the particle size is performed, so that the process has such advantages as low repair cost, high treatment efficiency and saving of energy consumption, provides a new method for soil heavy metal pollution abatement, and is broad in application prospect.
Owner:INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS +1

Method for remediating cadmium contaminated soil of vegetable field in situ by compounding bio-charcoal and organic fertilizer

InactiveCN102553905APollution passivation repair effect is remarkableNot easy to decomposeContaminated soil reclamationBiocharContamination
The invention relates to a method for remediating cadmium contaminated soil of a vegetable field in situ by compounding bio-charcoal and an organic fertilizer. The method comprises the following steps of: applying a passivation material obtained by compounding the bio-charcoal and the organic fertilizer in a mass ratio of 1:1 to a surface layer of soil of a cadmium contaminated vegetable field, fully and uniformly mixing the passivation material and the soil in a plowing layer with the thickness of 0 to 20cm, judging the contamination level of the soil according to environmental quality standard for soils GB15618-1995, and ensuring that the application rate of the passivation material is not less than 0.5 percent of the weight of dry soil, namely 750kg/mu when the cadmium concentration of the soil is 1.0 to 2.9mg/kg. The invention has the advantages that: raw materials of the passivation material are wide in source and low in cost, the application method is simple and has a remarkable effect of remediating the cadmium in the soil in a passivation way, and the risk of secondary contamination is avoided; and the bio-charcoal is applied into the soil, so the passivation material has the effects of reducing the discharge of greenhouse gas of farmland ecosystems, increasing the content of organic carbon of the soil, improving soil structures and the like, and has huge popularization and application value.
Owner:AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI

Electrodynamic method for removing fluorine contaminant in soil

The invention discloses an electrodynamic method for removing fluorine contaminant in soil, which is as follows: an anion-exchange membrane is arranged between the anode and the contaminated soil to prevent the H+ generated by the anode from entering the electrolyzer so as to avoid the increase of the acidity of the contaminated soil; sodium acetate solution is put in an anode chamber to be used as electrolyte, deionized water is put in a cathode chamber to be used as electrolyte, and the liquid levels of the anode chamber and the cathode chamber are maintained to be parallel; in the rehabilitating process, the electrolytes circulate constantly to be stirred evenly so as to bring away the H2 and O2 which are generated by the anode and the cathode; the sodium acetate solution added in the anode chamber supplies OH- which neutralizes the H+ generated by the anode, and the surplus OH- and the OH- generated by the cathode promote the adsorbed fluorine in the soil to be desorbed to be free fluorinions; and the fluoride in the soil is removed through the electrodynamic approaches of electromigration, electroosmosis and the like. The method can effectively promote the adsorbed fluoride to be desorbed from the surface of the contaminated soil particles, remarkably improves the fluorine contaminant removal efficiency, reduces overpotential and saves energy consumption, and after the soil is rehabilitated, the pH value of the soil is basically maintained at the original state.
Owner:HENAN UNIV OF SCI & TECH

Heavy metal-contaminated soil solidifying agent and application method thereof

The invention discloses a heavy metal-contaminated soil solidifying agent and an application method thereof. The solidifying agent comprises the following components by mass: on the basis of the dry weight of heavy metal-contaminated soil, 10 to 15% of a binding material, 5% of biochar, 10% of vegetable fiber and 1% of a stabilizing agent. The components are added according a sequence of the stabilizing agent-the biochar-the vegetable fiber-the binding material. Addition of the chemical stabilizing agent and the biochar in the process of stabilization enables heavy metals to be absorbed and passivated and to lose mobility; preparation of heavy metal-contaminated soil slurry provides conditions for a later chemical reaction; the whole processing process is free of dust pollution and discharging of unwanted sewage. Addition of the vegetable fiber enables cracking of heavy metal-contaminated soil solidified by using a conventional solidifying agent to be effectively prevented and endurance of a solidified body to be improved. The method provided by the invention has the advantages of strong operability, low cost, extensive applicability, a high resource utilization rate, low environmental risk and easy large-scale popularization.
Owner:INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI

In-situ rainwater leaching repair system for contaminated soil

The invention relates to an in-situ rain leaching repair system for contaminated soil. The in-situ rain leaching repair system at least comprises three parts, namely a rain collection part, a leaching repair part and a waste water treatment part, wherein the rain collection part is provided with water guiding pipes, a water collecting tank and canals, the leaching repair part is provided with an observation well, water collecting pipes and plants planted for the soil phytoremediation, the observation well is built in a middle-upper layer of contaminated soil, and the water collecting pipes are in the middle-lower layer; and the waste water treatment part is provided with a filter tank, a microorganism putting tank, an electric separation tank, a wind power generating set and the like, leaching waste water is firstly filtered by the filter tank, and is then repaired by the microorganism putting tank, and finally, the leaching waste water passes through the electric separation tank to process heavy metal so as to obtain the purified liquid. The in-situ rain leaching repair system establishes a complete contaminated soil simulated repairing system for the soil in an aeration zone, and combines repair technologies of leaching, plants, microorganisms, electric separation and the like. The in-situ rain leaching repair system has the characteristics of energy conservation, emission reduction and no secondary pollution, and is suitable for repairing the soil in a large-area aeration zone with little pollution.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)

Indirect thermal desorption device

ActiveCN101780467AMaintain physical and chemical propertiesLow costCombination devicesUsing liquid separation agentLiquid wasteCooling tower
The invention relates to an indirect thermal desorption device which comprises a feeding part, an auxiliary part, a heating part, a dedusting part, a washing and cooling part, a waste liquid purifying-recycling part, a waste gas adsorbing and filtering part, a discharging part and a monitoring part, wherein the feeding part and the auxiliary part are connected with the heating part, the discharging part comprises a gas discharging device and a soil discharging device, the washing and cooling part is a washing and cooling tower, the waste liquid purifying-recycling part is connected with the washing and cooling tower, the heating part is orderly connected with the dedusting part, the washing and cooling tower and the waste gas adsorbing and filtering part, the heating part, the dedusting part, the washing and cooling tower and the waste gas adsorbing and filtering part are also respectively connected with the monitoring part, and the waste gas adsorbing and filtering part is connected with an air introducing device in the auxiliary part. The invention has the advantages of large treatment capacity, low treatment cost, soil physicochemical property maintenance and the like, can effectively separate organic matters from contaminated soil and treat the organic matters, and also can complete the processes of waste gas washing, waster gas adsorption and the like so as to reduce the energy consumption of the overall system.
Owner:BCEG ENVIRONMENTAL REMEDIATION CO LTD

Layered remediation method for chromium contaminated soil

ActiveCN104741373AAvoid not distinguishing between soil propertiesAvoid methodContaminated soil reclamationChromium contaminationSoil properties
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.
Owner:BCEG ENVIRONMENTAL REMEDIATION CO LTD

Preparation and use method of microbial immobilized material for remedying polluted soil

The invention discloses a method for preparing and using a microbial immobilized material for repairing contaminated soil. The method comprises the following steps: (1) after being dried by air, the waste biomass raw material is pulverized or ground into 1-20mm of particles; (2) the biomass particles are carbonized and sterilized at the temperature of 150-450 DEG C and under limited oxygen condition for 0.5-6 hours to prepare a carrier material; (3) the carrier material is put into bacterium suspension for enrichment culture according to the solid-to-liquid ratio of 0.5-2mL/g, then the microbial immobilized material is produced; (4) the produced microbial immobilized material is added to organic contaminated soil according to the proportion of 1-500 tons per hectare soil, 0-30cm of topsoil is ploughed to cause the microbial immobilized material to be mixed evenly in the soil, simultaneously, the contaminated soil is biologically repaired and safe agricultural products are produced. The method has the advantages that the carrier material contains abundant lignin structures, carbon and nutrient elements, which provides more suitable matrix for microbial growth; and the immobilized material has strong affinity, high immobilization efficiency, strong adsorption capacity and good resistance against the pollutants in the environment; and the immobilized material is a soil fertilizer, and is suitable for large-scale in-situ biological repair of the contaminated soil.
Owner:ZHEJIANG UNIV
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