294 results about "Groundwater remediation" patented technology

A sparging system for in-situ groundwater remediation for removal of contamination including dissolved chlorinated hydrocarbons and dissolved hydrocarbon petroleum products including the use in injection wells of microfine bubble generators, matched to substrates of selected aquifer regions, for injection and distribution of said bubbles containing oxidizing gas through said aquifer and to selectively encapsulating gases including oxygen and ozone in duo-gas bubbles which, in the presence of co-reactant substrate material acting as a catalyst, are effective to encourage biodegradation of leachate plumes which contain biodegradable organics, or Criegee decomposition of leachate plumes containing dissolved chlorinated hydrocarbons.

The invention provides an in-situ restoration device and an in-situ restoration method of organic polluted soil and underground water. The in-situ restoration device designed by the invention comprises a pneumatic source system, an agent dissolving and preparing system, an in-situ injection system and an injection well system. The in-situ restoration device is characterized in that the organic polluted soil and the underground water in a saturation layer and a non-saturation layer can be restored, injection wells are distributed at polluted areas according to the conditions of pollution distribution and hydrogeololgy and the like, and oxidizing agents prepared by the dissolving and preparing system are injected into the polluted areas by certain pressure through the injection system to restore target pollutants. The in-situ restoration device provided by the invention has the advantages that the injection wells are subjected to three-layer sealing by three sealing materials, the integration is good, the disassembly is fast and the economic and fast effects are achieved.

A piecewise continuous-time dynamic control method and apparatus for optimizing remediation of groundwater is disclosed. The piece-wise continuous control process is used to generate efficient designs for rededication systems based on differentiable groundwater models. The remediation strategies generated are characterized by piece-wise continuous functions of time which dictate the operation of remediation devices. The piece-wise continuous functions may change discontinuity at the end of each management period, or optionally, a finite number of times during each management period. The duration and number of management periods covering a groundwater cleanup may be selected by the user of the invention to maximize the contamination removal efficiency and reflect the mechanical limitations of the specific rededication devices chosen. The continuous-time property of piece-wise continuous control requires simpler (usually sparse) derivatives of a groundwater model than the derivatives required by static and discrete-time control of groundwater remediation.

The invention relates to a technology for removing and controlling arsenic which has very high toxicity in water, and discloses a water treatment method for removing arsenic by strengthening zero-valent iron, which can be used for groundwater repair, drinking water treatment, industrial arsenic-containing wastewater treatment, sewage deep treatment and integrated small-scale water treatment systems. The water treatment method specifically comprises the following steps of: adding persulfate and zero-valent iron into water containing arsenic, wherein the persulfate is added in a molar ratio of the persulfate to arsenic of (5:1)-(100:1), and the molar ratio of the zero-valent iron to the persulfate in the water is (1:1)-(10:1); and when the mixed solution is fully mixed, filtering or depositing to finish the removal of arsenic. The water treatment method is very simple to operate, easy to popularize and apply and safe to use, and can be used for ensuring the water quality safety.

The invention discloses magnetic microsphere resin for removing nitrate nitrogen selectively, and a preparation method thereof, and belongs to the field of ion exchange resin. The resin consists of a resin skeleton, and magnetic granules wrapped in the resin skeleton; and the resin skeleton has a basic structural formula shown in the specification, wherein B is a quaternary ammonium salt group for adsorbing the nitrate nitrogen selectively, the saturation magnetization intensity of the quaternary ammonium salt group is between 5 and 30 emu / g, the exchange capacity of strong base is between 3.0 and 4.5 mmol / g, the exchange capacity of weak base is between 0.5 and 1.5 mmol / g, and the average grain diameter of the resin is between 50 and 500 micrometers. The resin is synthesized by a suspension polymerization method; acrylate monomers are mixed with a pore-forming agent and an initiator to form an oil phase; after being mixed with the magnetic granules uniformly, the mixture is subjectedto suspension polymerization with an aqueous phase mixed with a dispersing agent to form the magnetic polymer granules, and the magnetic polymer granules are subjected to aminolysis and alkylation toform the resin serving as a finished product. The resin can adsorb negative ions such as nitrates, nitrites and the like in a water body selectively, so the magnetic microsphere resin has a bright application prospect in fields of drinking water treatment, groundwater remediation and the advanced treatment of urban domestic sewage.

The present invention provides a safe, low-cost, effective composition and method for the remediation of contaminated subsurface material, the composition comprising solid alkaline material preferably in combination with stabilizing agents, that can be used to increase or maintain the pH of a subsurface zone and improve the performance of in situ treatment processes.

The invention relates to an underground water in-situ restoration system which is characterized by comprising a vertical impermeable wall arranged along the periphery of the polluted zone, wherein the vertical impermeable wall is in a semi-closed structure; the opening of the vertical impermeable wall is provided with a multi-treatment-unit reaction grid; the multi-treatment-unit reaction grid is arranged on the front edge downstream the underground water pollution stream and is perpendicular to the underground water flow; and the upstream and downstream of the multi-treatment-unit reaction grid are respectively provided with an underground water monitoring well for determining the change conditions of water level and water quality before and after underground water restoration. The system can overcome the defects of narrow restoration range, high clogging tendency, single treated pollution component and the like of the traditional continuous reaction wall in engineering application, can effectively restore underground water pollution streams with multiple pollutant components and complicated underground flow field, and can monitor the dynamic changes of water level and water quality of underground water in real time, thereby periodically cleaning and replacing the reaction medium in the treatment unit reaction grid.

The invention discloses a polluted site underground water processing-soil ex-situ leaching restoration integral method. The method comprises the steps that: extracted underground water is purified by using organic bentonite, and is discharged into a water storage tank and is used in a soil leaching process; with a multilevel wet vibration sieve, stones and coarse sand are separated from soil; a soil suspension liquid obtained by sieving enters a hydrocyclone; fine particles smaller than 0.05mm are processed and discharged into a frame filter press, and pollutants are removed with a thermal desorption method; particles larger than 0.05mm and the coarse sand are delivered into a leaching tank; a leaching liquid is a surfactant solution; stirring and ultrasonic processing are carried out, and standing sedimentation is carried out; upper-layer water phase is subjected to filtering and organic bentonite purification, and is discharged into a dispensing tank; lower-layer soil is delivered into a washing tank; stirring and ultrasonic processing are carried out, and standing sedimentation is carried out; soil phase is discharged into the frame filter press; and the soil reaches a standard and can be backfilled. With the method, underground water and soil synchronous restoration and leaching liquid recycling are realized. The method is easy to realize, and can be widely applied. The method can be used in polluted site soil and underground water restoration projects.

A bioremediation method and system for destroying or reducing the level of contaminants in a contaminated subterranean body of water includes a plurality of spaced injection sites. The injection sites extend below ground and intersect a body of groundwater. Each of the plurality of injection sites are in communication with a supply of concentrated oxygen. The oxygen is conveyed by a delivery mechanism from the supply of oxygen to the injection points to naturally reduce the contaminants in the groundwater. The amount of oxygen delivered to the groundwater is maintained such that the amount of oxygen in the soil gas vapor is between 15% and 25%.

The invention discloses a water treatment method of zero-valent iron-copper bi-metal activated persulfate. The water treatment method specifically comprises the steps that bi-metals including zero-valent iron and copper are added into water containing micro-pollutants, then persulfate is added, full mixing is performed, the bi-metals including the zero-valent iron and the copper are utilized to activate the persulfate so as to remove the micro-pollutants in the water. The water treatment method utilizes the bi-metals including the zero-valent iron and the copper to efficiently activate the persulfate so as to produce free sulfate radicals having strong oxidizing property, can achieve the purpose of quickly and thoroughly removing micro-pollutants, including multiple types of poisonous and harmful micro-pollutants in water, such as polychlorinated biphenyl, brominated flame retardants, drugs and personal care products (PPCPs) and algal toxin, and has the advantages of high activation efficiency, high oxidation and degradation efficiency of pollutants, wide pH using range, convenient operation and the like. The water treatment method can be applied to underground water remediation, treatment of industrial water (including electroplating wastewater, hospital wastewater, printing and dyeing wastewater and the like), drinking water treatment, wastewater treatment and the like.

The invention relates to a method of environment-friendly synthesis nanometer zero-valent iron-nickel bimetal materials. The method includes the following steps of weighing 20 g-60 g of green tea to be added into 1 liter of distilled water, heating the mixture for 40 min-60 min at the temperature of 60 DEG C-80 DEG C, cooling the mixture to the room temperature, and obtaining a green tea extracting solution by filtering the mixture; dissolving iron salt and nickel salt in the distilled water to prepare an iron-nickel mixed solution; adding the iron-nickel mixed solution into a three-opening flask, heating the solution in water bath at the temperature of 25 DEG C to 70 DEG C, stirring the solution for 10 min-60 min at the rate of 350 r / min, dropwise adding the green tea extracting solution in the stirring process, continuing to stir for 20 min, and obtaining environment-friendly synthesis nanometer zero-valent iron-nickel suspension liquid; and separating the suspension liquid through a suction filtration method, and drying obtained precipitates in a vacuum drying box for 12 h-48 h at the temperature of 40 DEG C-70 DEG C so that the environment-friendly synthesis nanometer zero-valent iron-nickel bimetal materials can be obtained. The preparation process is simple, the reaction condition is moderate, the cost is greatly reduced, and the method has the huge application and popularization potential in the field of chromium-contaminated soil and groundwater remediation.

The invention provides a method for electrically restoring soil and underground water, which is realized in a way that: soil or underground water which needs to be restored is used as the conducting medium, metallic iron is used as the anode, a ferric salt solution is used as the working solution, the anode iron is oxidized into ions after losing electrons, the ions enter the anode working solution and move towards the cathode into the soil or underground water as the current carrier with positive charges under the action of an electric field; and copper or copper-coated iron or iron is used as the cathode, a cupric salt or ferric salt solution is used as the working solution, cupric ions or trivalent ferric ions are reduced into elementary substance copper or bivalent ferric ions, meanwhile, small amounts of heavy metal cations transferring from the soil to the cathode working liquid are also reduced, and acid radicals of cupric salts or ferric salts move towards the anode under the action of the electric field and enter the soil and the underground water. The method can restore soil and underground water which are polluted by heavy metals, acids or alkalis, does not change the pH value of the soil and the underground water, does not produce hydrogen, oxygen or chlorine with hidden danger and has the advantages of high current efficiency, low price and easy obtainment of the anode material.

Provided herein are inter alia novel compositions and methods having application in a variety of fields including the field of enhanced oil recovery, the cleaning industry as well as groundwater remediation. In particular, the alkoxy carboxylate compounds and mixtures thereof presented herein can be used, inter alia, for the recovery of a large range of crude oil compositions from challenging reservoirs.

The invention discloses an underground water nitrogen-fixation remediation filtering material and a preparation method thereof, belonging to the field of underground water remediation. The filtering material is prepared from the following components in percentage by weight: 10-50% of plastic binding mineral, 1-10% of permeable substrate and 40-80% of inorganic cation exchange substrate or inorganic anion exchange substrate. The preparation method comprises the following steps: preparing raw materials according to the percentage by weight, and pulverizing the plastic binding mineral and the inorganic cation exchange substrate or inorganic anion exchange substrate to 200 meshes for later use; pulverizing the permeable substrate to 50 meshes for later use; thoroughly mixing the pulverized raw materials, granulating, and rolling to obtain balls; and calcining the obtained ball-shaped filtering material. The remediation filtering material can be combined with other biological curing materials, and has the technical advantages of low water resistance coefficient, almost no short stream or circle stream, and the like.

A groundwater remediation method for treating acidic or alkaline groundwater containing divalent and trivalent metal cations includes the step of injecting a slurry or suspension of solid alkaline material into the ground, the slurry or suspension being injected into one or more regions such that the groundwater contacts the solid alkaline material and the divalent and trivalent metal cations react to form a layered double hydroxide (LDH) material.

The present invention provides systems and methods for the remediation of contaminated water, soils and / or sediments. In some embodiments, the system includes one or more conduits for injection of hydrogen peroxide and ozone based reagents.

The invention relates to a bidirectional in-situ blocking remediation system for nitrogen pollution migration of shallow groundwater. The system is used for groundwater pollution control. The system mainly comprises a permeation well, a remediation filler, a filter material layer, a vegetation secondary adsorption interception area and monitoring wells; the permeation well is linearly buried perpendicular to a pollution feather-shaped body, and a shallow water-bearing stratum is exposed; organic mater permeation holes are formed in the positions, parallel to cylinder generatrices, of the wellwall at equal intervals; the remediation filler is located in the well; the outer side of the well is coated with the filter material layer; the monitoring wells are located on the two sides of the permeation well; and the vegetation secondary adsorption interception area is located on the remediation water outlet side of the permeation well. Compared with the prior art, the system has the advantages that a ground device and a power facility are not needed, and the construction, operation and maintenance cost is low; construction is easy, and difficulties in large-scale PRB excavation and earthwork are overcome; disturbance on the groundwater environment is reduced; biodegradation, physical adsorption, chemical reduction and phytoremediation are integrated, and therefore the groundwater remediation effect is enhanced; the nitrogen pollution migration in a lateral runoff and a vertical seepage of underground water can be blocked in a bidirectional mode, and the application prospect is wide.

The invention discloses a composite functional material for performing biochemical combined remediation on polluted underwater and a preparation method for the composite functional material and belongs to the technical field of underground water remediation. The composite functional material disclosed by the invention comprises a core, a material filling layer and a shell, wherein the core is made of a wood block; the material filling layer comprises 20-50 percent of a carbon release raw material, 25-42.8 percent of a plastic sticky raw material, 3.3-8 percent of reducing iron powder and the balance of a natural adhesive; the shell comprises 26.6-60 percent of a plastic sticky raw material, 12-40 percent of a high-permeation raw material and the balance of a natural adhesive. The preparation method for the composite functional material disclosed by the invention adopts a spherical granulation technology and is easy to operate and low in cost. By the adoption of triple controlled release, namely the core, the material filling layer and the shell, the composite functional material has the advantages of capacity of slowly releasing a carbon source and reducing iron, environment-friendliness, no pollution, small water resistance coefficient, low streaming and the like and can remove target pollutants in a more high-efficiency and quicker manner.

The invention relates to a soil in-situ dynamic sampling monitoring method and a soil in-situ dynamic sampling monitoring device for estimating repair results dynamically in the process of repairing soil and underground water. The method comprises the following steps of: excavating a monitoring hole in a mode of artificial excavation or equipment drilling, filling soil generated in the process of excavating into an in-situ dynamic sampling device according to the original sequence, marking the depth position of each monitoring point, and arranging the device in the monitoring hole; when monitoring is required in the repair process, drawing the sampling device out of the monitoring hole, and aligning a nondestructive testing instrument with each monitoring point in the sampling device by using a lossless detection instrument to perform detection; and after the detection is finished, inserting the sampling device into the monitoring hole again. Next sampling can be accomplished by repeating the same operating steps. In the sampling device, a rectangular run-through hole is formed in the middle of a hard plastic rod with a cylindrical or rectangular cross section to be used for storing the soil, and rib plates with holes are arranged in the middle of the sampling device to enhance the strength of the device. The sampling device is manufactured in a modular mode, and is jointed to different lengths according to the depth of the monitoring hole.

The invention discloses a 3D model simulation method specific to contaminated site remediation. The method comprises the following steps: 1) determining specific pollutants according to site investigation, and performing distribution of testing sites, sampling and analysis in a suspected contaminated area; 2) combining concentration analysis data of the specific pollutants serving as sample data with a geographic position on a GEO (Geographically referenced) sensor array through a computer data acquisition module to form an integrated data file, and uploading the integrated data file to a database; 3) performing reliability and error analysis on integrated data through analytical calculation in order to perfect data, and interpolating discrete sample point data of the integrated data through a conditional simulation method to form continuous surface data; and 4) forming an interactive 3D view to be output by the continuous surface data in conjunction with a 3D visualization technology in order to form a real-time three-dimensional contamination status map. Through adoption of the 3D model simulation method, an advanced sensing technology, a computer technology, a wireless transmission technology and the like are applied to the soil / underground water remediation industry, and meanwhile the remediation efficiency of an in-situ remediation process is increased.

The invention discloses a permeable reactive barrier composite material for repairing underground water polycyclic aromatic hydrocarbon contamination and a preparation method thereof, and belongs to the technical field of underground water repairing. The composite material comprises a sustained-release filling layer and a shell, wherein the sustained-release filling layer is prepared from the following components: 8.9-12.8 percent of zero-valent iron powder, 24.1-30.6 percent of a carbon release raw material, 16.6-20.3 percent of a plastic adhesive raw material, 5.5-8.3 percent of a high-permeable raw material and the balance of water; and the shell is prepared from 9.7-11.6 percent of a high-permeable raw material, 47.2-52.3 percent of a plastic adhesive raw material and the balance of water. The permeable reactive barrier composite material is low in cost and simple and convenient to prepare, has an effect of sustainably releasing iron ions and carbon sources, can be used for decomposing polycyclic aromatic hydrocarbon organic contamination under the underground water anoxia condition, and has a wide application prospect in the field of underground water contamination repairing.

The invention provides a double-liquid shallow-mixing in-situ chemical oxidation repair method for contaminated soil and groundwater and belongs to the technical field of contaminated soil and groundwater repair methods. The method comprises the following steps of (1), site leveling and zone measuring, (2), surface crushing and screening and cofferdam building, (3), shallow mixing equipment assembling and debugging, (4), agentia dispensing, wherein an oxidizing agent is dispensed to a first dispensing station, a catalyst, an inhibiter and a pH modifier are dispensed to a second dispensing station, and a double-liquid dispensing system is formed; (6), adding and shallow mixing construction of the double kinds of liquid dispensed to the first dispensing station and the second dispensing station, (7), surface layer curing, (8), agentia reaction and monitoring and (9) self-inspection and acceptance. According to the method, mixing equipment with an excavator and professional mixing heads and the double-liquid dispensing system are adopted, in-situ mixing can be achieved while an agentia solution is added, the reaction period is short, and the problem of the shallow contamination of the soil and groundwater can be solved.

The invention relates to the field of government of organically polluted underground water and especially relates to a three-stage restoration method and a three-stage restoration device of organic-chlorohydrocarbon-polluted underground water. The method particularly includes following steps: 1) feeding hot air from the bottom of a thermally air-stripping aerating oxidization column, wherein the hot air contacts with polluted underground water in a thermally air-stripping section; 2) carrying out a batch-type aeration operation to the underground water in an aerating oxidization section; 3) feeding the underground water to an ordered mesopore liquid-phase adsorption column and carrying out a deep adsorption process, and if the underground water is qualified, pumping the underground water to a recharge well to enable the underground water to be recharged to an underground water layer, if the underground water is not qualified, feeding the underground water back to the thermally air-stripping aerating oxidization column for reprocessing. Compared with the prior art, the invention is advantaged in that the method and the device are energy-saving and environmental-protective, are free of secondary pollution, have a total removal effect being more than 99%, can achieve continuous underground water restoration, can greatly increase a treatment efficiency of the organically polluted underground water and can save a treatment cost.

The invention discloses a preparation method of a loaded type nano iron underground water remediation agent and belongs to the field of remediation agents. The preparation method of the loaded type nano iron underground water remediation agent comprises the following steps: preparing a porous bone charcoal carrier from ox bone, directly mixing the carrier with an iron salt solution, dropwise adding a reducing agent into a mixed solution for reducing iron ions, forming precipitate in the iron ion reducing process, combining the precipitate with the porous bone charcoal carrier, and finally carrying out magnetic separation to obtain the underground water remediation agent. According to the preparation method of the loaded type nano iron underground water remediation agent, hydroxyapatite in the bone charcoal carrier can be used for extremely effectively removing the heavy metals, is high in degradation rate of heavy metal ions in the soil, is biodegradable, and is free of secondary pollution; the nano iron and the porous bone charcoal carrier are combined to prepare the remediation agent; the remediation agent is short in remediation time , high in remediation quantity and low in preparation cost; due to the loaded and coated nano iron, the problem of influence on the surface activity caused by the oxidization of the remediation agent when the remediation agent is in direct contact with the air can be avoided; the remediation agent has a wide application prospect.

The invention discloses a multi-objective groundwater remediation optimization method. The individual fitness function value archiving strategy, the Pareto dominance concept and a niche fitness sharing method are combined with tabu search (TS) to systematically form a new multi-objective optimization method. The method integrates the advantages of various optimization technology and is high in computing efficiency and strong in global search capability. Compared with the similar methods, the method of the invention mainly avoids repeated search in the optimization process and improves the diversity and the global property of seed solutions. The technology is coupled with the groundwater flow program (MODFLOW) and the solute transport program (MT3DMS) and has strong applicability to solving the multi-objective management model for groundwater pollution control.

The invention discloses a permeable reactive barrier system and a method for in-situ remediation of petroleum hydrocarbon in groundwater by an enhanced anaerobic biotechnology, and belongs to the field of groundwater remediation. Groundwater containing the petroleum hydrocarbon flows through a permeable reactive barrier along the water flow direction, nitrate-reducing bacteria and sulfate-reducing bacteria formed by microorganisms under anaerobic conditions are utilized to degrade the petroleum hydrocarbon in groundwater, and accordingly the purpose of remediation of the petroleum hydrocarbon polluted groundwater is achieved. The permeable reactive barrier system and the method effectively solve the problems of low efficiency and high power consumption in a method for in-situ remediation of the petroleum hydrocarbon in the groundwater with the aid of indigenous microbial flora, and have the advantages of low acting time, high remediation efficiency, strong operability and good remediation effect.

The invention relates to an organic polluted soil and underground water restoring method. Pollutants of soil and underground water are organic pollutants. The treatment method comprises two parts that (1) the A area is an overlapping polluted area of the soil and the underground water and adopts an in-situ chemical oxidation restoring technology method; and (2) only an underground water polluted area exists in the B area, and a pump-and-treat technology method is adopted. According to the organic polluted soil and underground water restoring method, restoring work of the soil and the underground water in different areas is conducted in a mode that various restoring technologies are combined, thus, it can be guaranteed that the construction period is shortened, and the cost is reduced, while it can be guaranteed that good restoring effects of the soil and the underground water are achieved, cross pollution and agent waste cannot be caused.

The invention provides a serial connection progressive underground water heavy metal pollution in-situ restoration system. According to the underground water flowing direction, one row of water extraction well group is arranged in parallel in a direction vertical to the underground water flow direction in the boundary position of the downstream of a pollution plume; a plurality of rows of recharging well groups are arranged in parallel at the upper stream of the water extraction well group corresponding to the water extraction well group; one row of recharging well groups at the uppermost stream is arranged outside a pollution source; a restoration reaction region is arranged between recharging wells of each row of recharging well groups and the recharging wells of the adjacent recharging well groups; outlet water treated by the restoration reaction region flows into the recharging well of the row of recharging well groups through a pipeline; active materials taking a reaction with heavy metals are filled in the restoration reaction region; modified zeolite is filled in a recharging well head; a water quality sensor is arranged in each well with a water extraction pump and is connected with a PLC (programmable logic controller); the starting and the stopping of the water extraction pump are automatically controlled. The invention also discloses an underground water restoration method.

The invention relates to an effective porosity tester for undisturbed soil. The effective porosity tester comprises a water supply tank, a water head regulation component, a seepage unit, a liquid equal-division unit and a detection unit, wherein a water supply unit is communicated with the seepage unit through the liquid equal-division unit. According to the effective porosity tester for the undisturbed soil, the effective porosity of rock soil can be tested, the effective porosity of an undisturbed soil test sample can be obtained by a solute replacement method, and the seepage unit can be used for sampling the undisturbed soil test sample; the effective porosity tester for the undisturbed soil is simple in structure, higher in effective porosity testing accuracy and good in application potential, and can be used for helping a student to understand a difference between the effective porosity and overall porosity as a teaching apparatus in a laboratory in hydrogeological researches, and a testing process is convenient; during practical production, the effective porosity tester for the undisturbed soil can be used for testing the effective porosity of the test sample, and a parameter testing experimental device is provided for further researches such as seawater infiltration, leakage recharge, submerged transport and in-situ groundwater remediation on solute transport.

A method for increasing the pH of subsurface material, contaminated with organic and inorganic compounds is disclosed. The pH is increased by introducing a solid alkaline material formulated into a suspension where particle size, surface charge and degree of flocculation are controlled to enhance transport and distribution throughout the treatment zone.