41 results about "Permeable reactive barrier" patented technology

The invention discloses construction equipment and a construction method for a non-excavation type permeable reactive barrier, and relates to the technical field of permeable reactive barriers. Step 2, constructing a reaction wall; and step 3, regular monitoring and maintenance. By improving the construction method, the construction efficiency and convenience can be improved; according to the construction equipment, a mounting mechanism and a clamping mechanism are arranged, a downward pressing seat drives a drill bit to move downwards to conduct drilling operation, after a certain depth is drilled, a fixing block moves out of a fixing groove, the downward pressing seat moves upwards, a rotating seat is separated from the drill bit, a lengthening section is moved to the position between the drill bit and the rotating seat, and the lengthening section is mounted between the drill bit and the rotating seat; the downward pressing seat continues to move downwards, so that the drill bit is driven to continue to move downwards for drilling operation; and after a certain depth is drilled, the operation is repeated, and the lengthening section is continuously added, so that the lengthening section is conveniently added, the drilling operation can be performed on a deeper position, and the drilling of different depths is conveniently performed.

The application provides a permeable reaction wall filling material and a preparation method and application thereof. The permeable reaction wall filling material provided by the application comprises a first molecular sieve, a second molecular sieve, a metal oxide, a mesoporous material and a binder, the silicon-aluminum ratio of the first molecular sieve is greater than or equal to 200, and the silicon-aluminum ratio of the second molecular sieve is 5-80. The permeable reaction wall filling material of the application comprises two molecular sieves with different silicon-aluminum ratios and a metal oxide, can effectively combine the principles of adsorption and oxidation, is applied in the treatment of soil and groundwater, has good treatment performance on low-concentration organic pollutants in water, and has excellent regeneration performance.

The invention discloses a PRB permeability coefficient prediction method considering a dynamic heterogeneous mineral precipitation blocking process, and belongs to the technical field of permeable reactive barrier, and the method comprises the following steps: carrying out a visual microfluidic experiment of CaCO3 heterogeneous precipitation; performing parameter extraction according to a visual microfluidic experiment result; constructing a multi-parameter correction function and correcting a K-C equation based on a visual microfluidic experiment result and the extracted parameters; and dynamically updating the K-C equation based on the multi-parameter correction function so as to complete the prediction of the permeability coefficient. According to the method disclosed by the invention, the pore structure image and permeability data in the heterogeneous precipitation process are synchronously obtained in situ by utilizing a visual micro-fluidic experiment, so that a quantitative relation between precipitation characteristics and key constants in a K-C equation is established and is dynamically corrected, and accurate prediction of the PRB permeability coefficient is further realized.

The invention relates to the technical field of heavy metal treatment, in particular to a heavy metal pollution resistance control and intelligent early warning method based on a permeable reactive barrier, which comprises the following steps: acquiring resistivity data, analyzing a spatial variation trend, extracting a derivative sequence to judge direction retentivity, screening out abnormal points to construct a boundary trajectory, and positioning a pollution and wall intersection section. And judging a response trend, merging point locations, and integrating and outputting a heavy metal pollution resistance control and intelligent early warning graph. According to the method, on the basis of continuous analysis of the resistivity change trend and the derivative sequence, the consistent features in the spatial direction are extracted, a pollution migration layer and a response distribution diagram are constructed, a stable diffusion region and a disturbance boundary are recognized, accurate positioning of the pollution path and the reactive barrier intersection section is completed, and the continuous response state is judged through the derivative trend continuity. The graphical expression of the dynamic pollution process and the accurate classification of response areas are realized, and the continuity of pollution identification, the timeliness of early warning output and the accuracy of spatial judgment are enhanced.

This invention discloses a method for repairing permeable reactive walls with in-situ unblocking and regeneration functions and microbial activation, belonging to the field of groundwater pollution remediation technology. The method uses a monitoring system to monitor and assess the status of the multi-media composite reactive wall in real time. When a blockage trend or a decline in treatment efficiency occurs, in-situ hydraulic disturbance, flushing and unblocking, and microbial activation are used to repair the multi-media composite reactive wall. This method uses permeability degradation as a trigger condition to synergistically implement in-situ unblocking and regeneration with the maintenance or dynamic activation of microbial activity in the repair of permeable reactive walls. By switching or coordinating the repair mode, unblocking mode, and activation mode under different operating conditions, it improves the engineering stability, repair sustainability, and full life-cycle operational reliability of permeable reactive walls without relying on specific reactive materials or strict environmental conditions.

This invention discloses a zoned permeable reactive barrier (PRB) for groundwater denitrification using a combination of zero-valent iron / slow-release carbon and zeolite, and its operating process. The PRB's structure comprises: (1) a quartz sand water distribution zone; (2) Fe... 0 / C-Denitrifying bacteria reaction zone; (3) Zeolite adsorption zone. This invention uses a mixture of biomass slow-release carbon and artificial slow-release carbon as a slow-release carbon source, and adds zero-valent iron to construct Fe 0 The / C system, using a mixed denitrifying bacteria agent for rapid start-up, and a zoned permeable reactive barrier (PRB) operation process for groundwater denitrification have been developed. This includes: filling processes based on different media permeability coefficients, reaction zone packing material compatibility based on different slow-release rates, and operating parameters based on different groundwater nitrogen pollutant concentrations. This invention improves the adaptability of the PRB process to hydrogeological conditions, accelerates the start-up of the denitrification process, ensures denitrification effectiveness during the start-up phase, improves denitrification efficiency during operation, and extends remediation time.

This invention discloses a method for predicting the permeability coefficient of a permeable reactive barrier (PRB) considering the dynamic non-uniform mineral precipitation and blockage process. It belongs to the technical field of permeable reactive barriers and includes: conducting a visualized microfluidic experiment on the non-uniform precipitation of CaCO3; extracting parameters based on the results of the visualized microfluidic experiment; constructing a multi-parameter correction function and correcting the K-C equation based on the results of the visualized microfluidic experiment and the extracted parameters; dynamically updating the K-C equation based on the multi-parameter correction function, thereby completing the prediction of the permeability coefficient. This invention utilizes a visualized microfluidic experiment to simultaneously and in-situ acquire pore structure images and permeability data during the non-uniform precipitation process, thereby establishing a quantitative relationship between precipitation characteristics and key constants in the K-C equation, and dynamically correcting it to achieve accurate prediction of the PRB permeability coefficient.

An emergency anti-seepage method for a permeable reactive barrier. The method comprises: determining a construction position of a permeable reactive barrier on the basis of hydrogeological conditions of groundwater, etc., using apparatuses such as an excavator, a hydraulic grab and a continuous trenching machine to excavate a trench to an impermeable layer, and placing outer frame bodies of a front wall and a rear wall into the excavated trench; establishing water-permeable structural body frames for the front wall and the rear wall on the basis of required wall dimensions, and assembling a plurality of water-permeable structural body frames to form a permeable reactive barrier; loading reactive media into the water-permeable structural body frames to form prefabricated water-permeable walls, placing the plurality of prefabricated water-permeable walls in the outer frame bodies and assembling same to form the permeable reactive barrier, wherein a chamfer combination formed by assembling the plurality of prefabricated water-permeable walls can be directly placed into a PVC pipe to serve as a groundwater monitoring well; and when an emergency leakage event occurs and isolation is required, replacing the prefabricated water-permeable walls with prefabricated water-impermeable walls. Thus, migration of contaminants can be effectively blocked, and uncontrollable leakage of contaminant sources is avoided.

This invention provides a permeable reactive wall process and its application for simultaneously removing hexavalent uranium and sulfate from groundwater. The permeable reactive wall process consists of a first treatment unit and a second treatment unit arranged sequentially along the water flow direction. The first treatment unit is filled with a first reaction medium, including zero-valent iron, sulfur-modified coconut shell charcoal, and sulfate-reducing bacteria. The second treatment unit is filled with a second reaction medium, including zero-valent iron, ferric oxide, sulfur-modified coconut shell charcoal, and *Priestia* sp., a non-pathogenic and environmentally friendly bacterium that can simultaneously remove uranium from water through adsorption and reduction. The composite permeable reactive wall process provided by this invention has strong resistance to interference from other substances in the water. When used to simultaneously remove sulfate and hexavalent uranium from groundwater at 15–35°C, the removal rates of both sulfate and uranium in the groundwater are greater than or equal to 90%.

The application provides a permeable reaction wall for composite mine pollution and a wastewater treatment system, wherein the permeable reaction wall comprises a framework shell, a filter layer and alkaline fillers; the alkaline fillers are located in the framework shell, and the filter layer is located between the alkaline fillers and the framework shell; the framework shell comprises a two-way geogrid, and the filter layer comprises a geotextile screen; the framework shell comprises a main body part and end parts located at two ends of the main body part, and openings are arranged on the end parts. The permeable reaction wall containing the alkaline fillers can neutralize the acidic water generated by the pollution in the mine, reduce the pollution degree of the water in the mine, reduce the cost, and has a good pollution water treatment effect.

The invention discloses a denitrification system and a permeable reactive barrier for rare earth mining area groundwater pollution remediation, and belongs to the technical field of groundwater remediation, the denitrification system sequentially comprises a nitrification area, a physical adsorption area and a combined denitrification area in the water flow direction, and filler of the combined denitrification area comprises a zero-valent iron material and denitrifying bacteria, the denitrification system is coupled with microbial remediation, chemical reduction and physical adsorption technologies, is low in cost and simple in structure, and can effectively improve the remediation effect of three-nitrogen pollution of underground water in the mining area by controlling the areas where the underground water in the rare earth mining area sequentially passes along the water flow direction.

The utility model provides a manganese removal permeable reactive barrier device which is arranged at an ore hole opening and used for intercepting pollutants in a reactive barrier body. The reaction wall device comprises a water guide door, a barrier wall, a plurality of sandstone transition areas and a plurality of reaction areas which are sequentially arranged in the direction of the underground water force gradient, and the sandstone transition areas and the reaction areas are sequentially, alternately and continuously arranged; each reaction area is provided with a reaction groove, a reaction turnover box is arranged in each reaction groove, and the reaction turnover boxes are filled with reaction adsorption materials in a replaceable mode and used for oxidizing dissolved-state divalent manganese in underground water into high-valence-state manganese oxide so as to reduce pollution mobility; the barrier efficiency of the reaction wall can be improved, and the repair cost can be reduced.

The invention discloses a permeable reactive barrier device with in-situ unblocking regeneration and microbial activation functions, and belongs to the technical field of groundwater pollution remediation. The device comprises an adjusting tank, a multi-medium composite reaction wall, a microorganism activation well, a flushing fluid injection well, an extraction adjusting well and a monitoring system. The permeable reactive barrier device overcomes the problems that in the prior art, in the process of treating high-concentration combined polluted underground water, a medium is prone to being blocked, the reaction efficiency is reduced, biological functions are difficult to maintain, and maintenance is difficult, and is high in structural integration level and high in operation stability and has the in-situ blockage clearing regeneration and microorganism activation functions. On the premise that the earth surface is not damaged and the reaction medium is not replaced, periodic recovery of the dielectric pore structure and the biological reaction performance of the reaction wall is achieved, the effective operation life of the reaction wall is remarkably prolonged, and the long-term stability and economical efficiency of groundwater remediation engineering are improved.

The invention relates to a sustained-release material, a permeable reactive barrier and an underground water remediation system.The sustained-release material comprises a core material and a matrix, and the core material is embedded in the matrix; the core material is selected from one of an acidic material and an alkaline material, and the matrix is selected from one or more of a polymer material and a wax material. According to the method, the pH value required by the optimal reaction in the PRB reaction zone can be regulated and controlled, and the pH value of the treated underground water can be maintained in a neutral range of an environmental standard.

The invention discloses an ultrasonic piezoelectric catalysis-permeable reactive barrier underground water remediation device, and relates to the technical field of underground wastewater remediation, the ultrasonic piezoelectric catalysis-permeable reactive barrier underground water remediation device comprises a reaction wall body, a plurality of inner containing cavities are formed in the side face of the reaction wall body at equal intervals, the reaction wall body is provided with a containing cavity on one side of the inner containing cavities, and a butt joint frame is fixedly connected in the containing cavity; a mounting frame is contained in the inner containing cavity, an ultrasonic piezoelectric catalysis assembly is arranged in the mounting frame, and a large number of active oxygen species are generated in the mounting frame through excitation; according to the device, the ultrasonic generation terminal, the piezoelectric catalytic layer, the flow guide plate and the multi-stage filter screen are integrated in the replaceable mounting frame, and the piezoelectric catalytic layer is excited by ultrasonic vibration to generate a large number of active oxygen species, so that efficient oxidative degradation of pollutants in underground water is realized. The guide plates and the guide grooves can regulate and control the water flow state, so that the retention time of water in a catalytic area is prolonged, and the contact area with a catalytic material is increased.

The invention belongs to the technical field of solid waste treatment, and discloses a stable management and control system and method for an acidic heavy metal waste residue storage yard, and the system comprises a sensor array, a data collection and transmission unit, an intelligent sensing and data fusion module, an in-situ collaborative stabilization module, and an efficient blocking module. The environment parameters of the storage yard are monitored in real time through the sensor array, the comprehensive risk index R is calculated through the dynamic risk index model, graded early warning is generated, and based on early warning information, the in-situ collaborative stabilization module conducts chemical stabilization response through the intelligent agent adding unit. Or deep biological fixation and surface layer cementation corrosion resistance are implemented through the gradient microbial mineralization unit. The efficient blocking module and the permeable reactive barrier form a tail end barrier through a composite anti-seepage lining layer. The whole process from real-time sensing and dynamic early warning to precise response, long-acting stability and efficient blocking is achieved, intelligent management and control are achieved, and the environmental safety and risk controllability of the acid heavy metal waste residue storage yard are improved.

The invention provides an electro-Fenton permeable reactive barrier system and application. The electro-Fenton permeable reactive barrier system comprises a permeable reactive barrier main body, an electro-Fenton reaction unit, a solid electrolyte layer and a photovoltaic energy unit, and is electrically connected with the electro-Fenton reaction unit, so that the fundamental problems that the degradation efficiency of refractory organic matters such as antibiotics is low and a filling medium is easy to inactivate in the traditional PRB technology are solved. Energy self-sufficiency and all-weather stable operation of the system in an underground water environment are achieved, dependence on power supply of a power grid is eliminated through the integrated photovoltaic-energy storage unit, and the limitation that a traditional electro-Fenton technology is difficult to apply to remote sites is overcome. The invention further provides application of the electro-Fenton permeable reactive barrier system to in-situ remediation of groundwater pollution.

This invention discloses an in-situ permeable reactive barrier remediation device and method for heavy metal-contaminated groundwater. The device comprises a permeation zone, a reaction zone, and a buffer zone arranged sequentially. The permeation zone is equipped with permeation packing material, and the buffer zone is equipped with buffer packing material. The reaction zone is equipped with reaction packing material, which includes at least zeolite loaded with nano-zero valent iron and attapulgite loaded with acidic substances. The surface of the attapulgite is coated with a gelatin layer. The particle size of the buffer packing material is smaller than that of the reaction packing material, and the particle size of the reaction packing material is smaller than that of the permeation packing material. This invention, by loading acidic substances into attapulgite and using it in combination with zeolite loaded with nano-zero valent iron, creates an acidic or weakly acidic environment for the zeolite loaded with nano-zero valent iron, effectively enhancing the removal of antimony from groundwater by the zeolite loaded with nano-zero valent iron, achieving excellent in-situ groundwater remediation results.

The invention is applicable to the technical field of contaminated soil remediation, and provides a device and method for remedying lead-contaminated soil through series electrodynamic force, and the device comprises an electrochemical remediation soil reaction device with a mixed electrolysis chamber arranged in the middle; the soil chambers are arranged on the two sides of the electrochemical remediation soil reaction device, and permeable reactive barrier chambers are arranged between the soil chambers and the mixed electrolysis chamber; the anode electrolysis chamber and the cathode electrolysis chamber are arranged at the two ends of the electrochemical remediation soil reaction device, and a permeable reactive barrier chamber is arranged between the soil chamber and the cathode electrolysis chamber; the perforated isolation plates are positioned between the soil chamber and the permeable reactive barrier chamber, between the soil chamber and the anode electrolysis chamber, between the soil chamber and the mixed electrolysis chamber, between the permeable reactive barrier chamber and the cathode electrolysis chamber and between the permeable reactive barrier chamber and the mixed electrolysis chamber, and the outer surfaces of the perforated isolation plates are coated with filter paper. Through a series device assisted by the permeable reactive barrier, the direct-current voltage applied in the repairing process is effectively reduced, the safety is improved, and other direct-current power supplies capable of providing low voltage can be conveniently used; meanwhile, the permeable reactive barrier with lead adsorption capacity is used for locking lead ions migrating in the soil and preventing the lead ions from entering the mixing electrolysis chamber, so that the influence of the lead ions on the removal of the lead ions by a downstream device is avoided, the effective operation of the series experiment device is ensured, the lead element is convenient to recycle, and the cost is reduced. And array work of breaking up the whole into parts can be achieved in the size amplification process of the remediation device, and it is ensured that soil remediation is completed safely and efficiently.

The invention relates to the technical field of underground water treatment, in particular to a PRB repair system based on a landfill and a repair method thereof.The system comprises a reaction wall body and a treatment repair module, the module analyzes a time-varying channel state through a broadband signal transmitted by a driving array, locks a colloid type and an electro-resonant frequency by matching dielectric response characteristics and a frequency spectrum library, calculates a filtering weighting coefficient based on spatial distribution, and controls the array to transmit a frequency-modulated pulsed electric field to a pollutant accumulation area; according to the invention, the problem that a metal-organic colloid complex generates reactive inertia due to protection of double electric layers, so that the metal-organic colloid complex penetrates through a conventional PRB (Permeable Reactive Barrier) to cause standard exceeding of effluent is solved; through MIMO beamforming and a resonance disruption mechanism, energy directional focusing of a hidden colloid channel and active breakdown of a double-electrode-layer structure are realized, complex-state heavy metal is effectively reduced to a free ion state which is easy to intercept, and the repair efficiency is remarkably improved.

The application discloses a method for removing pollutants based on a biochar-coupled high-iodate permeable reactive barrier, comprising the following steps: mixing biochar-high-iodate composite fillers with inert media to serve as filling media of the permeable reactive barrier, and making contaminated groundwater flow through the permeable reactive barrier to realize adsorption and degradation of organic pollutants; wherein a preparation method of the biochar-high-iodate composite fillers comprises the following steps: pretreating biomass raw materials, pyrolyzing and carbonizing the biomass raw materials under anoxic conditions to obtain biochar; mixing the obtained biochar with high-iodate, and loading the high-iodate on the biochar through ball milling; and drying the product obtained after the ball milling to obtain the biochar-high-iodate composite fillers. The application has both adsorption and oxidation functions, and due to the presence of the composite fillers, the pollutant removal capacity and long-term performance of the permeable reactive barrier are improved, and a green and sustainable in-situ remediation new scheme is provided for an organic pollution site.

The application discloses a permeable reaction wall circulating system for groundwater pollution remediation, which comprises a permeable reaction wall, a temporary sealing structure, a mechanical replacement device and a control system. When the performance monitoring unit in the permeable reaction unit of the permeable reaction wall detects that the performance of the reaction medium decays to a preset threshold, an output signal is sent to the control system and a central control room, a maintenance operator enters a maintenance operation room, a rolling barrier membrane unit is started, the whole reaction wall section is sealed, a lifting device is started to lift the permeable reaction unit to a replacement height, the permeable reaction unit is placed on a horizontal slide rail, is translated to a replacement position and is locked, the reaction medium is replaced, the permeable reaction unit is unlocked, the mechanical replacement device is started to reversely move the permeable reaction unit to the wall groove for resetting, and finally the barrier membrane is rolled up. The permeable reaction wall can be recycled and replaced quickly, the maintenance process is simplified, the remediation efficiency is improved, and long-term stable operation can be ensured.

The present application relates to the technical field of environmental remediation, and in particular to an intelligent responsive design system for a permeable reactive barrier (PRB) for groundwater contamination. A local intelligent responsive design system for a PRB for groundwater contamination constructs a plurality of information bases to comprehensively collect and organize relevant information about a target site, including hydrogeology, contaminants, and reactive media. By using the information to construct a machine learning model and a three-dimensional finite difference model, a PRB design scheme can be predicted on the basis of contaminant characteristics, and the actual site effectiveness of the scheme can be evaluated. By defining target conditions and constraint conditions, and using a genetic algorithm for optimization, a PRB design scheme that both meets remediation effectiveness requirements and conforms to actual situations is ultimately obtained, thereby providing a scientific, efficient and comprehensive solution for PRB design in groundwater contamination remediation.

The invention discloses a modular intelligent permeable reactive barrier system and a treatment method of polluted groundwater, the system comprises a modular permeable reactive barrier module, a groundwater monitoring module and an intelligent control terminal, and a reactive barrier adopts a'advanced oxidation-adsorption-biodegradation 'multi-stage composite design. According to the filling material, an information composite functional material and a directional adaptation strategy are introduced on the basis of basic materials such as zero-valent iron, a slow-release oxygen agent and zeolite, so that more efficient removal of complex pollutants in the leachate of the domestic garbage landfill is realized. The monitoring network tracks upstream and downstream water quality changes in real time, and the intelligent control terminal optimizes operation parameters through data analysis and early warns filler replacement requirements. The problems that a traditional PRB technology is low in treatment efficiency, prone to blockage and high in replacement cost are solved, and efficient, intelligent and sustainable remediation of the combined pollution underground water of the household garbage landfill is achieved.

The application discloses a self-constructed microbial permeation reaction wall and a construction method thereof, wherein the microbial permeation reaction wall comprises a permeation wall body with a mounting groove and a microbial reaction assembly for treating groundwater pollutants; the microbial reaction assembly comprises a water-permeable membrane arranged in the mounting groove, a first cross-shaped net-shaped frame and a second cross-shaped net-shaped frame arranged on a water-facing surface and a backwater surface of the water-permeable membrane respectively, and the first cross-shaped net-shaped frame and the second cross-shaped net-shaped frame are made of organic materials; the intersection of a first vertical part and a first horizontal part of the first cross-shaped net-shaped frame and the intersection of a second vertical part and a second horizontal part of the second cross-shaped net-shaped frame are all provided with a microbial source bin for embedding the same microorganisms or different microorganisms, and the microbial source bin is provided with a soluble shell. The application only needs to input a small amount of microorganisms once, and the microorganisms can gradually grow, increase and diffuse to every position of the microbial reaction assembly to obtain a wall body capable of intercepting and treating the pollutants.

The invention discloses an intelligent control electric soil engineering barrier system and a construction and operation method thereof, and is characterized in that the intelligent control electric soil engineering barrier system comprises an electric soil engineering barrier device and an intelligent control device, and the electric soil engineering barrier device comprises a cathode row and an anode row which are vertically arranged and arranged in parallel; the cathode row comprises at least two cathode electrode plates and a plurality of cathode conductive core bodies which are wrapped in the cathode electrode plates and are distributed at equal intervals, and a gap between every two adjacent cathode electrode plates is filled with a permeable reactive barrier; the cathode row comprises at least two anode electrode plates and a plurality of anode conductive core bodies which are wrapped in the anode electrode plates and are distributed at equal intervals, and a gap between every two adjacent anode electrode plates is filled with anode backfill soil; the intelligent control device comprises a power supply module and a monitoring and control module, and has the advantages that active interception, in-situ remediation and intelligent regulation and control can be combined, and efficient, lasting and intelligent interception and remediation of underground water pollutants can be realized.

The permeable reaction wall-circulating well combined control unit, system and method for repairing groundwater belong to the field of groundwater repair. The water-facing surface of the permeable reaction wall module is arranged with a water-permeable layer, and the water-facing surface of the circulating well module is provided with a low-permeability barrier layer, so that the inside of the permeable reaction wall module and the circulating well module forms a semi-closed treatment area. The middle part of the circulating well module in the height direction is filled with low-permeability materials to form a low-permeability filler layer, and the upper and lower parts of the low-permeability filler layer are respectively formed with an upper high-permeability filler area and a lower high-permeability filler area filled with high-permeability materials. When the circulating well module is started, the groundwater forms a circulating flow field in the semi-closed treatment area in the order of the permeable reaction wall module, the lower high-permeability filler area, the channel in the well pipe, the upper high-permeability filler area and the permeable reaction wall module. The scheme provided by the present application is simple and easy to implement, and has strong economic practicality, and can be widely applied in the field of groundwater repair technology.

The utility model discloses an osmotic reaction wall body structure for groundwater treatment, and relates to the technical field of groundwater pollution treatment, the osmotic reaction wall body structure comprises a hollow intercepting wall, an upstream flow guide assembly and an osmotic filtering assembly, the upstream flow guide assembly comprises a plurality of transmission cavity structures, each transmission cavity structure comprises a transmission frame, and a transmission plate is arranged in each transmission frame; the first permeation filtering layer is arranged between two adjacent transmission cavity structures and is fixed with the hollow intercepting wall; and a water flow guide plate structure. According to the utility model, the upstream flow guide component and the permeation filtering component are sequentially distributed along the water flow direction, so that the multi-stage permeation filtering process of polluted underground water is realized, and meanwhile, the water flow guide plate structure can utilize water pressure in a manner that the transmission frame moves left and right and the transmission plate moves front and back in the transmission frame; the water flow power of the first permeation filtering layer and the permeation filtering assembly is enhanced, the permeation process is optimized and accelerated, and the treatment efficiency is improved.

This invention relates to the field of groundwater remediation technology, and discloses an iron-manganese sulfide composite filler particle for chlorobenzene removal in low-flow-rate groundwater, its preparation method, and its application in permeable reactive barriers. The filler particle comprises an iron-manganese sulfide-corn stalk biochar composite material, bentonite, and an inorganic binder network. The iron-manganese sulfide-corn stalk biochar composite material includes corn stalk biochar and iron-manganese sulfide particles loaded thereon via in-situ chemical precipitation. The inorganic binder network consists of a silica framework formed by the dehydration and condensation of silica sol and layered bentonite mutually supporting each other. The iron-manganese sulfide-corn stalk biochar composite material is dispersed in the gaps of the inorganic binder network, forming a granular entity with a multi-level porous structure. This invention can significantly improve the long-term catalytic activity and physical structural stability of the material.

The application relates to the field of groundwater pollution remediation, in particular to an oxidation-reduction coupled permeable reaction wall and an evaluation method thereof. The oxidation-reduction coupled permeable reaction wall comprises a cover plate, a cement outer wall body, water stop plates, a reduction chamber, an oxidation chamber and a mixing chamber. The three water stop plates are alternately and vertically fixed on the cement outer wall body and the top cover plate respectively, and the reduction chamber, the oxidation chamber and the mixing chamber are separated by the water stop plates. The reduction chamber and the mixing chamber are communicated by an upper pipeline, and the oxidation chamber and the mixing chamber are communicated by a lower pipeline. The reduction chamber is sequentially provided with a detachable coarse quartz sand plate, a fine quartz sand plate and an active reaction plate from bottom to top. Through the synergistic effect of reduction-oxidation-adsorption, the oxidation-reduction coupled permeable reaction wall can effectively deal with the composite contaminated groundwater to realize complete mineralization of organic pollutants, and has the advantages of high remediation efficiency and strong applicability.