965 results about "In situ remediation" patented technology

In general, the purpose of the probe system is to provide improved rapid field methods using re-designed direct push technology (DPT) and “push-pull testing” concepts to evaluate in situ chemical, biochemical, surfactant, adsorptive media, and leaching and fixation remediation technologies for hazardous subsurface contaminant(s). The probe system and methods described here when applied to a hazardous waste site being considered for in situ remediation of contaminants (organic or inorganic) by the listed treatment technologies will yield information that greatly reduces the uncertainty with regards to treatment effectiveness for the in situ soil, groundwater, and contaminant(s) conditions affecting dosage requirements and reaction rate(s) for various reactants. The probe system described here is multi-purpose in that it was designed: 1) to measure the relative permeability of the subsurface soil and groundwater to a liquid or gas ejectant, 2) to recover soil gas, soil, or groundwater samples for contaminant analyses, 3) to measure the chemical dosage and reaction, dissolution, adsorption, desorption, leaching, or fixation rate of a reactant such as a chemical or biochemical oxidant, metallic or bimetallic dehalogenating agent, surfactant or emulsifier solution, adsorbent media regenerant, leaching or fixation reagent that is injected into the matrix and withdrawn during a push-pull test, 4) to perform combinations of the above, 5) to measure the in situ adsorption capacity of adsorbent media and subsequently measure the effectiveness of regenerant(s) for the adsorbent media, and (6) to measure the effectiveness of a treated soil column for inorganic contaminant(s) leaching or fixation. In addition to being an in situ remedial alternatives evaluation tool, the probe system can be used as a reactant(s) delivery device after the specific remedial technology has been selected.

A method for preparing highly stabilized and dispersible zero valent iron nanoparticles and using the nanoparticles as a remediation technology against inorganic chemical toxins in contaminated sites. The method employs a composition containing select polysaccharides (starch or cellulose) as a stabilizer for the iron nanoparticles in a liquid carrier, and results in suspensions of iron nanoparticles of desired size and mobility in water, brine, soils or sediments. The stabilizer facilitates controlling the dispersibility of the iron nanoparticles in the liquid carrier. An effective amount of the composition is delivered to a contaminated site so that the zero valent iron nanoparticles can remediate one or more toxins such as an arsenate, a nitrate, a chromate, or a perchlorate in the contaminated site.

An improved deep remediation injection system for in-situ remediation of contaminated soil and ground water. The system includes a soil penetrating lance for injecting at least two different highly-pressurized fluids taken from the group of air, gaseous oxygen, ozone, oxygenated liquid, hydrogen peroxide, surfactant-containing liquid, catalyst-containing liquid and suspended biologicals-containing liquids, or a liquid containing other chemicals, into said contaminated soil as said soil penetrating lance is inserted for penetration therein. The soil penetrating lance has at least an upper set of injection ports, the upper set of injection ports being generally radially spaced-apart on said lance, and at least one lower set of injection ports, the lance having an average width in the vicinity of the upper set of injection ports. The lance further includes substantially fluidically-independent first and second conduits leading, respectively, to the lower set of injection ports and the upper set of injection ports so as to permit delivery of separate pressurized fluid streams to the upper and lower sets of injection ports and then into the soil. The upper and lower sets of injection ports are spaced apart from each other on said lance a distance no farther than about three times the average width of said lance in the vicinity of the upper set of injection ports.

The invention relates to an in-situ remediation method of heavy metal-organic combined pollution soil. According to the method, a set of electrokinetic remediation device is added with a power switching system, an electrode heating technology is combined with the electrokinetic remediation and chemical oxidization technology, namely, the direct current power is utilized firstly, sodium persulfate used as the oxidizing agent is migrated to soil through electric process, meanwhile, migration and removal of heavy metal ion in the soil are realized. Then the alternating current power is switched, and soil is heated to a certain temperature through the electrode heating method so as to activate the sodium persulfate migrated to soil, and thereby realizing the in-situ degradation of organic pollutant in the soil. The method applies electrode to the electrode heating system and the electrokinetic remediation device at the same time, simplifies the remediation device and saves the system energy consumption while solves the difficulty that oxidant cannot migrate and activate in the soil and improves the remediation efficiency; the method is a combined soil remediation technology with prospect of application and promotion.

The invention belongs to the technical field of polluted ground water remediation, and particularly relates to a method and a system by using micro-namo bubbles to perform reinforcement in-situ remediation on polluted ground water. The method comprises the steps of: arranging a water injection well at the upper reaches of a region with ground water polluted by pollutants, and feeding micro-nano bubble water containing nutrient salts; leading the micro-nano bubble water to flow to the polluted region with the ground water, so as to decompose the pollutants or continuously compensate electron acceptors or electron donors for microorganisms and facilitate degradation and removal of organic pollutants; at the same time, arranging a water pumping well to pump water at lower reaches of the polluted region, so as to form a subsurface flow field; and using a monitoring well to monitor and analyze parameters in real time during the process of removing the organic pollutants, and adjusting the generating time and the aeration intensity of the micro-nano bubbles. According to the invention, the micro-nano bubbles are good in oxygen supply effect, long in lasting time and wide in influencing range, the method and the system provided by the invention can make up the shortages of common in-situ remediation technologies such as natural degradation, bioventing and the like and are low in cost and high in energy-saving efficiency, thereby being applicable in remediation for a field with a limit area and a high pollution load.

The invention provides a bioremediation composition for in situ bioremediation of soil and / or groundwater contaminated with hydrocarbons, comprising an adsorbent capable of adsorbing said hydrocarbons, a mixture of facultative anaerobes capable of metabolizing said hydrocarbon under sulfate-reduction conditions, a sulfate-containing compound that releases sulfate over a period of time, and a nutrient system for promoting growth of said anaerobes, wherein said nutrient system includes a sulfide scavenging agent.

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.

The invention belongs to the technical field of in-situ remediation of soil pollution, and particularly relates to a system and a method for removing organic pollutants in soil employing microwave-assisted soil vapor extraction (SVE). The method comprises the following steps: injecting a microwave-assisted material into soil to be repaired; paving an airtight cover membrane on the surface of the area of the soil to be repaired; providing one or more pumping wells in the area of the soil to be repaired; providing a plurality of air injection wells, monitoring wells and injection pipelines within a theoretical coverage range of the pumping wells. By adopting the method, a microwave is adopted as a heat source, so that various of organic pollutants in the soil are primarily processed by volatilization and decomposition mechanisms; desorption of adsorbed state organic matters in soil particles is facilitated; steam state formation of volatile organic compounds (VOCs) is accelerated; the extracted steam is processed by a ground waste gas and wastewater treatment device, so as to achieve the target of repairing the organic polluted soil. The technology has the advantages of being low in cost, strong in maneuverability, wide in range of processing organic matters, free of damage to a soil structure, free of secondary pollution and the like, can adopt standard equipment, and has a broad application prospect.

The invention provides an oxidation catalyst to purify CO in room temperature, which is prepared in coprecipitation method or deposition-precipitation method. The catalyst consists of non precious metal active components and carrier, wherein the loading of the active components is 5 to 80 percent of the conversion value of metal element. The active components come from cobalt salt liquid, iron salt liquid, nickel salt liquid, manganese salt liquid, copper salt liquid, zinc salt liquid, tin salt liquid and cerium salt liquid. The carrier comes from alumina, silica, molecular sieve, honeycomb ceramics, wire fence, cobalt oxide, iron oxide, manganese oxide, copper oxide, zinc oxide, tin oxide and cerium oxide. The precipitant is Na2CO3, K2CO3, sodium hydroxide, urea or ammonia. The catalyst preparation solution needs to be fully stirred for 1 to 8 hours and the retrogradation duration is 1 to 16 hours. The dried solution needs to be treated in in-situ remediation in air, oxygen, and hydrogen or nitrogen atmosphere in temperature from 100 to 500 degrees centigrade. The catalyst disuses precious metal as active component, so the cost is low and the preparation process is simple.

The invention discloses an in-situ remediation system and method for synergistically removing organic pollutants of soil and underground water. The method comprises the following steps: uniformly injecting chemical oxidants in chemical oxidant mixing storage tank into the soil and the underground water; generating high-temperature steam through a steam generator, and injecting the high-temperature steam into the soil and the underground water; starting a vacuum pump to extract gas from a vacuum extraction well, forming negative pressure in the well, and promoting desorption of volatile and semi-volatile organic compounds from the soil; and treating and discharging the volatile and semi-volatile organic compounds through a gas-liquid separation tank and an activated carbon adsorption tank. The high-temperature steam heat can activate the chemical oxidants so that degradation and removal of the organic pollutants in the underground water can be further accelerated, the underground water organic pollutants which are not completely degraded are further adsorbed, intercepted and degraded through an iron carbon adsorption permeation wall, so that the purpose of synergistically remediating the soil and the underground water is achieved, and secondary pollution of the soil and the underground water is avoided.

The invention discloses a method for comprehensive treatment of a town river way. The method comprises exogenous pollution control: sewage draining outlet pretreatment and branch surge pretreatment; endogenous pollution removal: bottom mud pollutant treatment and biological purification of polluted water; in-situ remediation of a river channel ecological system: ecological restoration of aquatic plants and restoration of aquatic animals; and supplemented feeding of an efficient microbial agent and ecological restoration monitoring of the river channel. A staged treatment principle is adopted for the method for comprehensive treatment of the town river way, conditions are created positively to gradually reduce river channel pollution; through the exogenous pollution control, the endogenous pollution removal, the in-situ remediation of the river channel ecological system, later period maintenance and ecological regulation and the like, a water system is made smooth, the river channel is made clean, the ecological system is established artificially, the self-cleaning capacity of the river channel is restored gradually, healthy water circulation of the river channel is achieved, biodiversity is promoted, and virtuous circle of the town and country environment and the ecological system is promoted.

The invention discloses a composite microbial agent and a preparation method and application thereof. The composite microbial agent includes a pseudomonas preparation, an acinetobacter preparation, a bacillus amyloliquefaciens preparation, a bacillus subtillis preparation, a bacillus licheniformis preparation, a pediococcus acidilactici preparation, a rhodobacter sphaeroides preparation, an alkali-lake dietzia preparation and a rhodopseudomonas palustris preparation. The preparation method includes the following steps that 1, composite microbial agent components are prepared; 2, the composite microbial agent components are mixed in proportion to obtain the composite microbial agent. The composite microbial agent can simultaneously decompose different organic matter, degrade amino nitrogen and nitro nitrogen in water, reduce phosphorus concentration in the water body and inhibit the growth of algae. The composite microbial agent is used for urban-rural sewage in-situ remediation, has the advantages of being high in efficiency, quick to take effect, free of no secondary pollution, simple in operation and the like, and large-scale application and popularization are facilitated.

The present invention provides a supported reactant for in situ remediation of soil and / or groundwater contaminated with a halogenated hydrocarbon consisting essentially of an adsorbent impregnated with zero valent iron, wherein the adsorbent is capable of adsorbing the halogenated hydrocarbon. In one embodiment, the adsorbent is activated carbon.

The invention relates to a method for repairing heavy metal contaminated soil in situ by adopting multifunctional biological charcoal. According to the technical scheme, the multifunctional biological charcoal is prepared from biological waste such as straws and sawdust, the surface of the multifunctional biological charcoal is provided with multiple surface functional groups and rich enterable micropores, the heavy metal contaminated soil of which the relative humidity is 60-90% is turned over and mixed with the multifunctional biological charcoal of which the granularity is 0.074-0.178mm, the turnover mixing depth is 5-30cm, and the soil can be repaired after being aged for 20-30 days. The mass ratio of the multifunctional biological charcoal to the heavy metal contaminated soil is (0.1-5) to 100. The multifunctional biological charcoal serving as a soil additive in the in-situ repairing process can effectively fix heavy metals in the soil, improve the ecological environment, supplement organic charcoal, protect the soil health, reduce the toxicity of the contaminated soil and restore the productivity of the soil; and the method is also applicable to engineering repairing of water bodies and solid matrixes.

The invention discloses a stereoscopic ecological corridor system and method for in-situ remediation of a riverway water body. The system comprises an intercepting unit, a preprocessing unit, a wetland unit, a greening filtration unit, a back-flushing unit, a drainage unit and a plant control unit. According to the system and the method disclosed by the invention, technical problems that an existing artificial wetland needs intermittent operation and filler blockage highly possibly occurs after long-term operation are effectively solved; a treatment effect and impact load resistance of the entire system are improved, and an occupied area is reduced; and meanwhile the system has a flood control function. In addition, a complete ecological purification system formed through various optimization technologies realizes organic integration of riverway water environment improvement and water ecological remediation. The system has advantages of being small in occupied area, realizing in-situ treatment in a riverway, free from influence on a drainage demand, good in treatment effect, strong in capacity of removing nitrogen and phosphor, strong in adaptability to impact load, free from mosquitoes and flies, convenient in operation and maintenance management, etc., and is suitable for treating riverways contaminated by domestic sewage and industrial wastewater.

Provided is a heavy metal pollution soil repairing agent using excess activated sludge as the rawmaterial, a method of extraction and a method for repairing the heavy metal pollution soil, which relates to a heavy metal pollution soil repairing agent and a method thereof and a method for repairing the heavy metal pollution soil, and solves the problems of high cost, easily secondary pollution and complex operation existing in the repair of the heavy metal pollution soil. The heavy metal pollution soil repairing agent is composed of amylose, protein, nucleic acid, phosphoric acid, amino acid, humic acid compound, uronic acid and the organic substance required for cell lifecycle. The method for distilling the heavy metal pollution soil repairing agent is as follows: the wastewater treatment excess activated sludge reacts under the condition of 80-120 KPa and 60-100 DEG for 8-20 minutes; then centrifuges for 8-20 min at the rotating speed of 5000-7000r / min. The invention adopts the home position repairing or the heterotopia repairing to repair the heavy metal pollution. The invention has low cost and no secondary pollution, simple operation, short repairing period, strong activity and wide range of application.

The invention relates to a biological PRB (permeable reactive barrier) system for underground in-situ remediation of coal mine acid wastewater, and belongs to the technical field of water pollution control. The system comprises a water inlet groove, a biological PRB body and a water outlet tank, wherein the water inlet groove is higher than the goaf ground for 0.3-0.5 m; the biological PRB body adopts a four-layer structure, and sequentially consists of a buffer protecting barrier, a ferrous powder PRB, a biological medical stone PRB and a buffer protecting barrier; the water outlet tank adopts the sectional separating plate type, so as to ensure that the interior of the biological PRB is always in the water filling anaerobic state in the running process of system. The system is arranged on the coal mine goaf, and the defects of land occupation during ground treatment, pollution to environments, laying of long-distance conveying pipelines and the like are overcome. The system has the advantages that the structure is simple, the cost is low, the safety is realized, the efficiency is high, and the manned watching is not required in the running process. On the basis of the traditional PRB, the novel PRB with biological strengthening function is established in the method that the medical stone is fixed and mixed with sulfate reducing bacteria.

The invention belongs to the technical field of in-situ repair of soil polluted by heavy metals, in particular to a method for controlling and repairing soil polluted by a heavy metal of cadmium in situ. The method is characterized in that wheat straws with water content of 5 percent are crushed to straws less than or equal to 2 cm; the straws and 0-20cm of soil polluted by the heavy metals on the surface layer are mixed and treated for 90 days; and according to the standard that the content of cadmium in the polluted soil is 4.55mg / kg, the consumption of land blocks for planting Chinese cabbages is 15.4 ton / hectare and the consumption of land blocks for planting wheat is 23.2 ton / hectare. Farmland treated by the technology can be used for agriculture planting. The invention provides energy-saving, rapid and environment-friendly method for repairing farmland polluted by the heavy metal of cadmium in-situ.

The invention discloses a method for treating underground sewage, in particular for the underground water which is polluted by nitrobenzene and aniline. The original restoration of the underground water with chemical and biological combination reaction wall is adopted in the method. The upper reach of the flowing underground water is provided with a chemical reaction wall, and a biological reaction wall is arranged below the chemical reaction wall with a certain distance away. The chemical reaction wall consists of nonvalent ferrum and active carbon at a certain proportion, and the biological reaction wall consists of the attached nitrobenzene degradation bacteria and the attached aniline degradation bacteria biological active carbon. The nitrobenzene is reduced to be the degradable nitrobenzene through the chemical reaction wall, and the nonvalent ferrum is good in the removal of the nitrobenzene organism which is difficult in degradation, so the chemical reaction wall has good applicability and can achieve 120-minute reaction time and the 97.4 percent of the reduction rate for the nitrobenzene. The production of the biological reaction wall with the biological active carbon is good in the removal of the target pollutant. The work of the biological reaction wall for 36 days can achieve more than 98.83 percent of the degradation rate for the nitrobenzene with the preliminary density of 300.89mg / L, and the work of the biological reaction wall for 71 days can achieve more than 99.6 percent of degradation rate.

The invention discloses a method for remedying cadmium (Cd) and lead (Pb) polluted soil by alum pulp in situ and belongs to the technical field of in-situ remediation of heavy metal polluted soil. The method comprises the following steps: (1) preparation of hot-alkali modified passivant of heavy metal polluted soil; (2) selection of Cd and Pb polluted soil suitable to in-situ remediation by alum pulp passivant; and (3) in-situ remediation of heavy metal Cd and Pb polluted soil. In the method, the by-product alum pulp in the production of alum is taken as a raw material which is activated and modified by hot alkali to form an efficient heavy metal passivant, and by the passivant, the contents of the exchangeable Cd and Pb in the soil can be lowered by over 60% and 65% respectively in one to four months; and the method has the characteristics of low raw-material cost, simple production technology, stable passivation effect, operation simpleness and the like. The method can be popularized and used in farmland soil with medium-low Cd and Pb pollution.

The invention relates to a method for restoring hexavalent-chromium-polluted underground water by virtue of stable zero-valent iron nanoparticles. According to the method, for preventing the agglomeration of the nanoparticles and prolonging the reaction activities of the nanoparticles, water-soluble polysaccharide (CMC) is utilized as a stabilizer and a dispersing agent to synthesize stable iron-based nanoparticles, so that high dispersity and long reaction activities can be realized, the nanoparticles are effectively transferred to a target pollution source of a heavy metal pollution field by virtue of an injection method, and toxic heavy metal Cr (VI) contained in the nanoparticles is reduced, adsorbed and fixed, so that the transfer capabilities of the nanoparticles in soil and underground water are reduced, and finally an in-situ restoring purpose of the pollution field is realized; the method can be applied to the industries such as electroplating, printing and dyeing, electronic device machining, heavy metal machining and the like, and zero-valent iron and nanometer iron oxide have excellent application prospects in restoring processes of environmental pollutants due to special superiorities and wide decontamination and water purification capacities.

The invention relates to a river pollution bottom sediment ecological remediation method. A bottom sediment stacking region is arranged at a river bank side, anti-seepage treatment is carried out on the bottom and the periphery of the bottom sediment stacking region, bottom sediments dug from a river and polluted by heave metals are added with a curing agent and are stacked in the bottom sediment stacking region; a separation region is arranged between the bottom sediment stacking region and a river water flow passage, and at least one separation wall is arranged in the separation region; an in-situ covering region is arranged in the dredged river water flow passage, first covering layers are laid at both the bottom of the separation region and the bottom of the in-situ covering region, a second covering layer and a third covering layer are also arranged on the first covering layer of the in-situ covering region, a filler of the first covering layer is a mixture of clay and the curing agent, the second covering layer is formed by sand grains, and the third covering layer is formed by pebbles and natural zeolite. According to the river pollution bottom sediment ecological remediation method disclosed by the invention, not only can the heavy metals in the bottom sediments be adsorbed, but also water can be accumulated, and a landscape function of the river is promoted; an in-situ remediation technology not only can prevent release of bottom sediment pollutants, but also can improve a water quality purification function of the river.

The present invention belongs to the technical field of environmental engineering water treatment, particularly to a coast black-odor river channel water quality in-situ remediation system, which comprises: grates and a plurality of dams sequentially arranged in a water quality in-situ remediation river channel along to a water flowing direction, wherein the effluent surfaces of each dam are slopes, multi-stage tapered blocks are arranged on the slopes along the water flowing direction, the bottom portions of the slopes are provided with in-situ aeration biological filtration pools, artificial biological films are arranged in the water areas between the dams, and ecological floating beds are arranged on the water surfaces between the dams. According to the present invention, the water quality pollution indexes in the remedied water body are reduced by more than or equal to 70%, the dissolved oxygen and the transparency of the water body are significantly increased, the black-odor phenomenon is complete removed, and the remedied water body can be used as the landscape water.

The invention discloses a microorganism electrochemical device for in-situ remediation of polluted water and bottom mud and a method for in-situ remediation of polluted water and bottom mud, and relates to a microorganism electrochemical device and a method for in-situ remediation of polluted water and bottom mud. The invention aims at solving the problems that polluted water and bottom mud in rivers and lakes are complex to remedy, high in cost and high in maintenance cost by using an existing biological fuel battery. The microorganism electrochemical device comprises a cathode, an anode, a first lead, a second lead and a charge-discharge device. The method comprises the following steps: putting the anode of the microorganism electrochemical device for in-situ remediation of polluted water and bottom mud into polluted bottom mud, putting the cathode into polluted water above the polluted bottom mud, connecting the cathode and the anode with the cathode and the anode of the charge-discharge device by using the first lead and the second lead respectively, and operating for 18 days, thereby obtaining water and bottom mud from which pollutants are removed. The microorganism electrochemical device and the method can be applied to in-situ remediation of polluted water and bottom mud.

The invention relates to a surfactant enhanced organic polluted soil electric-biological remediation method and a surfactant enhanced organic polluted soil electric-biological remediation device, which can effectively improve the efficiency of traditional electric-biological remediation of organic pollutants. The surfactant enhanced organic polluted soil electric-biological remediation method comprises the following steps: designing a cylindrical electrode matrix configuration of an annular anode on the outer side of a central cathode; filling a soil remediation system with biochar immobilized microorganisms along the inner side of the anode to form an annular biological PRB (Permeable Reactive Barrier), and adding a surfactant into remediated soil by adopting an electric injecting mode. According to the method, the difficult problems that the organic pollutant bio-availability is low, the remediation efficiency spatial difference is large, and the overall remediation efficiency is low in the traditional soil electric-biological combined remediation are solved; the method can be used for ex-situ remediation of organic polluted soil, and can also be used for in-situ remediation.

The invention relates to the field of soil remediation and discloses an in-situ bioremediation preparation for heavy metal contaminated soil. The preparation contains fungi and / or bacteria with heavy metal degrading abilities, the fungi refer to at least one of aspergillus niger, rhizomucor variabilis and grey cunninghamella, and the bacteria refer to at least one of bacillus amyloliquefaciens, bacillus licheniformis and bacillus simplex. By using the preparation for in-situ bioremediation of the heavy metal contaminated soil, the problems that the soil needs to move by using a moving method and secondary chemical agent pollution of the cultivated land is easily caused by using a decomposition method can be overcome, at the same time, residual heavy metals in the soil obtained after catabolism through the fungi and / or bacteria can also be fully used, the problem that high residual heavy metals in the soil seriously endanger food safety is solved, the soil micro-ecology is improved, the cultivated ability of soil is more quickly recovered, and the method is relatively low in cost and has broad application prospects.