111 results about "Contaminated groundwater" patented technology

The invention discloses a method for repairing heavy metal polluted underground water based on a slow-release repairing agent. The method comprises the following steps: S1, preparing an external slow-release material; s2, preparing an internal sustained-release material; s3, designing a dosing well; and S4, calculating the dosage. According to the invention, two different sustained-release materials are used as the basis and are coated with each other to form the sustained-release repairing agent, and the inner sustained-release material has stronger adsorption capacity, so that the problem of poor effect of the outer sustained-release material under the condition of high-concentration heavy metal polluted underground water can be solved; meanwhile, the outer slow-release material can further assist and slow down release of the inner slow-release material, finally, a set of long-term treatment scheme suitable for various complex heavy metal polluted groundwater is formed by matching with the special repairing agent tubular column and a dosage correction formula, and the effective repairing effect on groundwater heavy metal pollution can be achieved.

The invention discloses a dynamic circulating purification method and device for underground water polluted by organic matters, and relates to the technical field of organic pollutant purification, the dynamic circulating purification device comprises a sedimentation tank, a sewage inlet tank is arranged above the sedimentation tank, a sedimentation tank is arranged below the sedimentation tank, and a blow-off pipe is arranged at the bottom of the sedimentation tank; the guide plate and the sealing plate are fixedly connected at a certain angle, the guide plate and the sealing plate uniformly rotate on the inner wall of the settling pond, the guide plate is used for guiding sewage, and the sewage in the settling pond can be layered in the settling pond by rotating the sealing plate, so that organic matters settled at the bottom of the settling pond can be more effectively extracted; according to the scheme, the density difference of different components of sewage is utilized, high-concentration pollutants are settled to the bottom under the action of gravity, and relatively clear upper-layer water is positioned at the top, so that the two parts can be quickly and effectively separated, sludge at the bottom is prevented from being remixed with the upper-layer water, and the stability of the treatment effect is kept.

The invention provides a biochar-zero-valent iron enhanced bentonite-based vertical barrier material for combined polluted underground water, which comprises sodium modified calcium bentonite and sandy soil, and also comprises biochar and slow-release zero-valent iron particles, and the slow-release zero-valent iron particles are formed by mixing and stirring micron-sized zero-valent iron and sodium alginate. Related preparation methods and uses are also provided. The anti-seepage performance of the biochar-zero-valent iron enhanced bentonite-based vertical barrier material for combined polluted underground water meets the anti-seepage requirement that the permeability coefficient is lower than 10 <-9 > cm / s under the stress of heavy metal, chlorinated hydrocarbon and micro-plastic combined polluted underground water, heavy metal can be effectively reduced and precipitated, chlorinated hydrocarbon is dechlorinated, and micro-plastic is adsorbed; therefore, the concentration of composite pollutants in underground water is reduced, and the long-acting performance of the vertical barrier material is improved.

The invention relates to an organic combined polluted underground water in-situ remediation method based on a micro-nano iron-based material. The method comprises the following steps: acquiring underground water pollution information; establishing a composite reaction zone at a preset position, and constructing a reduction-oxidation chain reaction system; and operating the composite reaction zone, collecting monitoring data, and optimizing the composite reaction zone until the composite pollution is degraded and removed to a preset value. Through series reaction of powerful reduction of the micro-nano iron-based material and advanced oxidation of the iron-based activated persulfate, the performance of the micro-nano iron-based material serving as a strong reduction material and an active agent is fully played, pollutants such as halogenated hydrocarbon in underground water are sequentially subjected to reduction degradation, pollutants such as benzene series and volatile phenol are sequentially subjected to oxidative degradation, and the pollution to the underground water is reduced. Effective management and control of underground water combined pollution of medical and chemical parks and enterprises are realized; a monitoring well is configured based on a composite reaction zone, and remediation materials are discontinuously added in combination with management and control conditions, or other management and control materials are flexibly selected, so that long-term management and control of groundwater pollution risks are realized.

The invention relates to the technical field of underground water sampling detection, in particular to a depth-keeping sampling device for NAPLs polluted underground water. The device can perform accurate stratified sampling on an upper water sample and a lower water sample of a depthkeeping aquifer, effectively reduces disturbance of the aquifer, improves the sampling precision of the water samples, and reduces the measurement error of the volume of polluted groundwater; comprising a monitoring well pipe, a sampling pipe section arranged at the monitoring well pipe and a sampling mechanism used for fixed-depth water sample sampling, and the self-closing type plugging piece comprises an annular frame, a plurality of sampling holes evenly distributed around the annular frame at equal intervals in the circumferential direction and first self-closing valves installed in the sampling holes; the sampling mechanism comprises a walking mechanism which can be installed in the monitoring well pipe in an up-down sliding mode, a guide frame which is installed at the bottom of the walking mechanism and corresponds to the sampling holes, a plurality of sampling devices and a synchronous pushing device. And the sampler comprises a sampling bottle, a valve piece mounted at a bottle opening of the sampling bottle, a sampling tube mounted on the valve piece and a second self-closing valve mounted in the sampling tube.

A polyelectrolyte-surfactant complex, a method of removing a toxic substance from contaminated soil or contaminated groundwater using a polyelectrolyte-surfactant complex and a method of making a polyelectrolyte-surfactant complex. The polyelectrolyte-surfactant complex is made from a complexated recombinant intrinsically disordered protein that has been electrostatically conjugated to an anionic surfactant to provide enhanced liquid-liquid phase separation properties.

The present invention relates to the technical field of nanopowder preparation, and discloses a method for preparing a nitrogen-doped biochar-loaded iron nitride composite material. The process is as follows: (1) potassium ferrate, urea, and waste tea powder are ground and mixed in proportion to obtain a first mixture; (2) the first mixture is reacted in a temperature range of 50-70°C to obtain a second mixture; (3) the second mixture is reacted in a temperature range of 600-800°C for 1-3 hours, and then cooled to room temperature to obtain a third mixture; (4) the third mixture is washed and dried to obtain a nitrogen-doped biochar-loaded iron nitride composite material. Compared with the existing preparation process, the beneficial effect of the present invention is that the operation steps only include grinding, stirring, heating, etc., the operation is simpler, the overall process only involves one pyrolysis, the energy consumption is lower, and the toxic gas ammonia is not used, and the operation is safer. The material can degrade trichloroethylene without an anaerobic environment and can be used for the remediation of organochlorine-contaminated groundwater environment.

The present application relates to the technical field of groundwater pollution remediation, and particularly relates to a method and device for in-situ remediation of hexavalent chromium contaminated groundwater, wherein the device comprises a multifunctional well group, a medicament supply system, an aeration system, a monitoring system and a control system; the multifunctional well group comprises a plurality of multifunctional wells; the medicament supply system is used for pretreating medicaments, modified composite reducing agents and composite functional bacteria liquid respectively; the control system is used for receiving monitoring data; the control system is also used for displaying monitoring data and equipment operating states, and setting operating parameters by a user; the control system is also used for automatically adjusting medicament dosing amount, aeration flow and aeration pressure according to monitoring data and operating parameters set by the user. Through the design of the multifunctional well group, the medicament supply system and the aeration system, the hexavalent chromium contaminated groundwater can be simultaneously subjected to chemical reduction, biological reinforcement and adsorption fixation, so that the three processes are coordinated to realize rapid, efficient and long-acting remediation of the hexavalent chromium contaminated groundwater.

This invention belongs to the field of wastewater treatment technology and discloses a mechanical catalytic treatment method and system for wastewater and contaminated groundwater. The mechanical catalytic treatment method for wastewater and contaminated groundwater includes the following steps: adding a treatment agent to the wastewater to be treated, mixing and reacting, filtering, and completing the wastewater treatment; wherein, the treatment agent includes at least one of piezoelectric catalytic material and magnetic resin; the mixing reaction is carried out under ultrasonic cavitation and / or spiral aeration conditions; the piezoelectric catalytic material includes a porous plant cellulose fiber carrier and a C3N5 functional layer in situ grown on the surface of the carrier; the magnetic resin includes a benzo-melamine-formaldehyde resin matrix with sulfonic acid groups bonded to a benzene ring and Fe3O4 magnetic nanoparticles uniformly dispersed in the resin matrix. This invention eliminates the need for chemical agents in wastewater treatment, avoids secondary pollution, effectively treats complex water bodies while reducing operating costs, and possesses good environmental friendliness and practicality.

The present invention relates to the technical field of groundwater sampling and detection, and in particular to a fixed-depth sampling device for NAPLs-contaminated groundwater; the device can accurately sample upper and lower water samples of a fixed-depth aquifer, effectively reduce disturbance of the aquifer, improve water sampling accuracy, and reduce errors in measuring the volume of contaminated groundwater; the device comprises a monitoring well pipe, a sampling pipe section arranged at the monitoring well pipe, and a sampling mechanism for sampling water at a fixed depth; the self-closing plugging member comprises a ring frame, a plurality of sampling holes equidistantly distributed circumferentially around the ring frame, and a first self-closing valve installed in the sampling hole; the sampling mechanism comprises a traveling mechanism slidably installed in the monitoring well pipe, a guide frame installed at the bottom of the traveling mechanism and arranged corresponding to the sampling holes, a plurality of samplers, and a synchronous pusher; the sampler comprises a sampling bottle, a valve component installed at the bottle mouth of the sampling bottle, a sampling tube installed on the valve component, and a second self-closing valve installed in the sampling tube.

The purpose of the invention is to provide in situ treatment and flow diversion of contaminated groundwater without the need for an external energy source. The primary means by which contaminated groundwater is treated in situ within a subsurface environment is through the use of the modular SubflowRx and interrelated components that work together or independently to control groundwater flow outside the system as well as diverting contaminated groundwater inside the system for extended treatment. The present disclosure provides embodiments, examples, and advantages of how the components work to achieve this common purpose.

The application provides a low-permeability stratum contaminated groundwater remediation device and method, which comprises an industrial computer, the industrial computer is used for controlling the working state of an extraction mechanism according to the information inside a pumping well, a first monitoring mechanism and a second monitoring mechanism monitor the concentration change of groundwater pollutants, and feed back the groundwater pollution condition to the industrial computer, the extraction mechanism extracts groundwater into the inside of a groundwater purifier for treatment, and a transmission mechanism changes the position of the extraction mechanism according to the distribution of the groundwater pollutants; the low-permeability stratum contaminated groundwater remediation device and method have the advantages of improving the groundwater extraction efficiency, effectively improving the extraction effect of the groundwater pollutants, and reducing the operation cost of the groundwater extraction.

The application discloses an in-well treatment device and method for LNAPL contaminated groundwater remediation, and the treatment device comprises a power supply module unit, which is positioned and hung on the edge of a well mouth; a reaction module unit, which is arranged in the well; the reaction module unit comprises a reaction module shell and a reaction inner container, the side of the reaction module shell is a groundwater inlet, the reaction inner container is arranged in the reaction module shell, and the bottom of the reaction inner container is an ultrafiltration membrane assembly; and a driving module unit, which is arranged below the reaction module unit. The treatment device is installed in the well space, and when running, a vortex is formed below the treatment device, and then the LNAPL pollutants floating on the surface of the groundwater are introduced into the reaction inner container from the side of the reaction module shell, and the water molecules of the LNAPL pollutants removed by the reaction inner container are reflowed into the well, so that the pump and the ground treatment system are not needed, and the defects of high energy consumption and large disturbance of the traditional extraction treatment technology are effectively avoided.

The application provides a groundwater in-situ remediation system and method of multiple biological permeation reaction wall coupling ultrasonic waves and plant remediation, the groundwater in-situ remediation system comprises a multiple biological permeation reaction wall, a PLC control system and an artificial plant ecological remediation area, the multiple biological permeation reaction wall is arranged in a funnel-gate type engineering, the funnel part blocks the contaminated groundwater through a vertical cement curtain, an ultrasonic generator module is arranged in front of the gate part of the multiple biological permeation reaction wall, the multiple biological permeation reaction wall is divided into two layers, the filling material of the first layer permeation reaction wall is mainly composed of zero-valent iron, iron oxide and construction waste, the filling material of the second layer biological permeation reaction wall is mainly composed of high-performance biological adsorption zeolite and ORC slow-release material calcium peroxide, a microbial bacteria liquid injection pipe is arranged in the second layer biological permeation reaction wall, and monitoring wells are arranged on the two sides of the multiple biological permeation reaction wall and the artificial plant ecological remediation area.The application can treat and remediate multiple composite pollutants at a time, and the pollutant degradation efficiency is improved.

The invention discloses a preparation method of a biomass-based slow-release agent for repairing polycyclic aromatic hydrocarbon polluted underground water, which comprises the following steps: 1, preparation of soybean milk fermentation liquor: weighing soybeans, soaking the soybeans in ultrapure water according to a solid-to-liquid ratio of 1: 20-1: 50 for 12-48 hours, pulping, and adding ultrapure water until the volume is 500mL to obtain a soybean milk matrix; inoculating 10mL of polycyclic aromatic hydrocarbon polluted underground water indigenous microorganism bacterial liquid into the soybean milk matrix, and carrying out closed fermentation under a constant-temperature oscillation condition, 2, preparation of a multifunctional composite slow-release agent: weighing 35-60 parts by weight of FeSO4. 7H2O, 1-5 parts by weight of rhamnolipid, 5-10 parts by weight of humic acid, 1-5 parts by weight of methionine, 5-10 parts by weight of peanut peptide, 1-10 parts by weight of soybean lecithin, 3-10 parts by weight of a yeast extract and 40-60 parts by weight of the soybean milk fermentation broth prepared in the step 1; the method has the beneficial effects that the degradation efficiency on organic pollutants such as polycyclic aromatic hydrocarbon is remarkably enhanced, and a reliable material basis and theoretical support are provided for engineering application of an underground water bioremediation technology.

The present invention relates to the field of sewage treatment technology, and discloses a composite material composition for groundwater remediation, a composite material, a preparation method thereof, and an application thereof. The composite material comprises nanometer zero-valent iron sulfide, ruthenium chloride-modified biochar, attapulgite, a persulfate, and a binder; the mass ratio of the nanometer zero-valent iron sulfide, the ruthenium chloride-modified biochar, the attapulgite, the persulfate, and the binder is 1:2-6:0.5-1.5:1-3:16-40. The composite material provided by the present invention is resistant to clogging and scaling, has high permeability, and has a high removal rate of target pollutants in groundwater. It can be used as a filler in permeable reactive grids (PRBs) for treating contaminated groundwater.

The present invention discloses a barrier wall-permeable reaction wall combination structure suitable for deep groundwater purification. A low-permeability barrier wall is arranged at the downstream groundwater outlet of a landfill, and a permeable reaction wall is arranged on the upper part of the middle section of the low-permeability barrier wall. The low-permeability barrier wall is formed by filling with low-permeability barrier wall materials such as soil-bentonite, cement-bentonite or grouting curtain; the section below the water level of the permeable reaction wall is filled with reactive fillers such as activated carbon, limestone or zeolite, and pollutants in the groundwater are removed by the reactive fillers; the section above the water level of the permeable reaction wall is filled with non-reactive fillers such as coarse sand or gravel. The present invention can solve the problems of large excavation depth, high construction cost and low filler utilization rate in the traditional permeable reaction wall structure for purifying deep contaminated groundwater, and can effectively purify target pollutants such as COD, ammonia nitrogen and heavy metals in deep contaminated groundwater.

The invention discloses an anaerobic microbiological treatment system and method for underground water polluted by chlorinated organic compounds. The system comprises a fermentation tank, an adjusting tank, an air supply system, a material supply system, an output system and a monitoring system, wherein the air supply system, the material supply system, the output system and the monitoring system are connected with the fermentation tank and the adjusting tank. The method comprises the following steps: S1, adjusting polluted underground water; s2, constructing an anaerobic environment; s3, adding microorganisms; s4, balancing the pressure; s5, bacterial liquid detection; s6, dynamically treating the polluted underground water; and S7, detecting and reinjecting the treated underground water. According to the invention, the polluted underground water can be stably, continuously and efficiently treated by using the anaerobic dechlorination microbial liquid, in the use process, a 0.22 [mu] m filter membrane is used for removing particles at each gas inlet end, bacteria and microorganisms are interfered to prevent cross contamination, and the whole system is kept sealed in the whole fermentation and treatment process, so that the pollution of the underground water is avoided. And on the premise that strict sealing is kept, accurate liquid supplementing, stirring, sampling detection and collection reinjection can be achieved, the high integrated automation function is achieved, and application and popularization are facilitated.

The application discloses a process for treating contaminated underground water based on an internal circulation ozone contact reaction tower, which comprises the following steps: S1, preliminary treatment; S2, ozone contact reaction; introducing the water to be treated into a water inlet of the tower body, and injecting ozone gas into an inner cylinder to promote the water flow in the inner cylinder to flow from bottom to top to the two filling layers and then to circulate back to the inner cylinder; S3, aeration treatment; and S4, sedimentation and filtration; the process for treating sewage by using the internal circulation ozone contact reaction tower can optimize the gas-liquid mass transfer effect, the flow state of ozone is smoother, the ozone utilization rate is increased by more than 25%, and the treatment effect on sewage can be improved through the setting of the whole process.

The present application relates to the technical field of sewage treatment, and discloses a composite material composition for groundwater remediation, a composite material, and a preparation method and application thereof.The composition contains modified nano zero-valent iron, cobalt chloride modified biochar, attapulgite, persulfate, and a binder; the mass ratio of the modified nano zero-valent iron, the cobalt chloride modified biochar, the attapulgite, the persulfate, and the binder is 1:2-6:0.5-1.5:1-3:16-40.The composite material provided by the present application forms a micro-electrolysis environment by using carbon nitride modified nano zero-valent iron and cobalt chloride modified biochar, can effectively improve the selectivity and removal rate of target pollutants, and can continuously play the roles of adsorption, Fenton-like catalytic oxidation, and micro-electrolysis in the process of treating contaminated groundwater after being embedded by the binder, so that the purpose of efficiently removing pollutants in groundwater is achieved.

The invention is applicable to the technical field of pollution remediation, and particularly relates to a remediation method for polluted underground water in a storage yard based on coupling and blocking of a permeable reactive barrier, and the method comprises the following steps: acquiring site hydrogeological conditions and distribution conditions of pollution plumes, and constructing a stretching arm type water stop guide wall; constructing a lifting type PRB system, wherein the lifting type PRB system is constructed in a closure area of two downstream arms of the arm-expanding type water stop guide wall; the PRB filler is determined according to the water quality, the flow and the flow velocity of the underground water, the lifting type PRB system is filled with the PRB filler, and the polluted underground water is repaired through the PRB filler. Polluted underground water at the bottom of the tailing pond and around the tailing pond is blocked, guided and converged by the aid of the arm-expanding type water-stopping and flow-guiding wall, the polluted underground water is guided into the lifting type PRB system, and the polluted underground water naturally flows through the PRB system under the converging action of the water-stopping and flow-guiding system. Therefore, the underground water flowing to the downstream through the PRB system reaches the underground water environment quality standard requirement or meets the ecological function requirement of regional underground water.

This invention relates to a composite microbial agent for the remediation of hexavalent chromium pollution and its application, belonging to the field of environmental engineering technology. The composite microbial agent for hexavalent chromium pollution remediation includes anaerobic bacteria, aerobic bacteria, heavy metal bacteria, and a carbon source. This composite microbial agent can maintain high activity in the actual complex environment of groundwater with low temperature and low nutrients, rapidly reducing hexavalent chromium to low-toxicity, low-migration trivalent chromium, achieving efficient removal of hexavalent chromium. The in-situ remediation method for hexavalent chromium-contaminated groundwater of this invention can be widely applied in environmental engineering fields such as industrial site pollution remediation, mine wastewater treatment, and agricultural non-point source pollution remediation, and is particularly suitable for in-situ injection-enhanced natural attenuation groundwater remediation processes.

The invention provides a ternary nano-composite modified bentonite-based vertical barrier material for underground water polluted by antibiotics, which comprises sodium modified calcium bentonite, an Mg-Al LDH (layered double hydroxide) / g-C3N4 / ZIF-8 ternary nano-composite and sandy soil, the ternary nano-composite is prepared by the following steps: reacting magnesium nitrate hexahydrate, aluminum nitrate nonahydrate and urea at high pressure and high temperature to obtain Mg-Al LDH; thiourea is subjected to a heating reaction, and g-C3N4 is obtained; the preparation method comprises the following steps: carrying out microwave treatment on g-C3N4 and Mg-Al LDH to obtain a composite intermediate; and drying a reaction product of 2-MIM, the composite intermediate and zinc nitrate hexahydrate, grinding into powder, and sieving. The invention further provides a preparation method and application. The anti-seepage performance of the vertical barrier material meets the anti-seepage requirement that the permeability coefficient of organic matter is lower than 10 <-9 > m / s under the stress of antibiotic polluted underground water, antibiotics can be effectively adsorbed, the leaching toxicity is low, and the vertical barrier material is environmentally friendly.

The application discloses an in-situ remediation system for organic contaminated groundwater and a remediation method thereof, and relates to the technical field of groundwater pollution remediation. The system comprises a circulating well main well unit, which comprises a monitoring well with a plurality of holes in the wall, and a water pumping pipe and a water injection pipe arranged in the monitoring well. A sealing unit is arranged in the monitoring well and can seal or unseal the inside of the monitoring well. The water injection pipe is located above the sealing unit, and the water pumping pipe penetrates through the sealing unit. An electro-Fenton reaction unit is arranged above the sealing unit and can generate hydrogen peroxide. A power driving unit can drive the sealing unit to move up and down through the water pumping pipe. The remediation method based on the system can complete the sealing and unsealing of the well, and further realize the purpose of freely adjusting the position of the upper and lower screen sections of the well and the proportion of the screen section and the actual section. The electro-Fenton reaction unit realizes the in-situ sufficient generation of oxidizing agents through electrochemical reaction, and realizes the efficient oxidation and removal of organic pollutants in the groundwater through the coupling with the circulating well technology.

The present invention discloses a bimetallic Co / Mn-MOF / ZnAl-LDHs material and its application, belonging to the field of wastewater treatment technology. The present invention in situ grows a Co / Mn-based metal organic framework on a ZnAl-LDHs carrier by a hydrothermal method, so that the prepared Co / Mn-MOF@ZnAl-LDHs inherits the advantages of the spatial structure of MOF and the arsenic affinity of LDHs, and the rich adsorbent active surface contains functional groups such as OH, M-O-M and Co / Mn-O, which can highly selectively separate and remove arsenic from complex wastewater, and the preparation method is simple and economical. Therefore, the prepared Co / Mn-MOF@ZnAl-LDHs adsorbent can be used as a potential heavy metal scavenger for the treatment of heavy metal-contaminated groundwater or industrial wastewater.

The invention discloses a hexavalent chromium polluted underground water green remediation system and application. The hexavalent chromium polluted underground water green remediation system comprises a remediation well body and a non-contact sustainable electron injection system arranged in the remediation well body. The repair well main body comprises a shaft and a through hole formed in the wall of the shaft; the non-contact sustainable electron injection system comprises a medicament chamber and a graphite cathode plate; the medicament chamber is a closed space enclosed by a proton exchange membrane and a sealing plug, and a graphite anode plate and a sodium dithionite solution are accommodated in the medicament chamber; the graphite cathode plate is electrically connected with the graphite anode plate; according to the non-contact sustainable electron injection hexavalent chromium polluted underground water green remediation method, a reducing agent does not need to be added into a water-containing layer, the secondary pollution risk caused by the reducing agent and a product thereof is avoided, and green and efficient hexavalent chromium underground water remediation is achieved.

This invention relates to the fields of environmental protection and groundwater remediation technology, and discloses a composite slow-release material for remediating organically contaminated groundwater, its preparation method, and its application. The method includes: pretreatment of sludge; mixing sludge powder with RuCl3 solution, calcining with carbon dioxide to obtain modified biochar powder; calcining an organic nitrogen source to obtain carbon nitride powder; mixing cobalt salt, manganese salt, copper salt, ammonium fluoride, modified biochar powder, urea, and water, and reacting with sodium percarbonate to obtain a catalyst biochar material; mixing carbon nitride powder, catalyst biochar material, iron salt, and an oxygen-removing solvent, and reacting with a reducing agent to obtain modified nano-zero-valent iron; mixing modified nano-zero-valent iron, sodium percarbonate, and sodium persulfate, and adding to a binder to obtain the composite slow-release material. The composite slow-release material prepared by this method can continuously exert adsorption, Fenton-like catalytic oxidation, and micro-electrolysis effects to effectively remove pollutants from groundwater.

This invention belongs to the field of groundwater remediation technology and discloses a method for treating chlorinated hydrocarbon-contaminated groundwater using biochar in synergy with zero-valent iron (ZVI). The method includes the following steps: (1) mixing biomass with iron-containing materials and then pyrolyzing the mixture under oxygen-limited conditions at a temperature of 700-900°C to obtain biochar-ZVI material; (2) injecting the biochar-ZVI material into the chlorinated hydrocarbon-contaminated groundwater to be treated for reaction, with the reaction time lasting at least 7 days, thereby achieving the treatment of chlorinated hydrocarbons in the chlorinated hydrocarbon-contaminated groundwater; wherein the pH value of the chlorinated hydrocarbon-contaminated groundwater does not exceed 11. The biochar-ZVI material prepared using the specific process of pyrolysis at 700-900°C can effectively treat chlorinated hydrocarbons in chlorinated hydrocarbon-contaminated groundwater. The synergistic chemical effect between biochar and ZVI significantly increases the electron capacity of zero-valent iron in the reaction and enhances the reaction activity.

The application discloses a method for repairing chlorobenzene contaminated groundwater in-situ by using soluble Mn(III), and belongs to the technical field of environmental pollution repair, and comprises the following steps: construction of an in-situ injection system, preparation of a repair reagent, rapid removal of chlorobenzene, and continuous mineralization of degradation products. The soluble Mn(III) generated by a permanganate / bisulfite (PM / BS) process is selected as the repair reagent, the chlorobenzene pollutants are rapidly and efficiently degraded through an electrophilic substitution mechanism, the PM process is coupled, the continuous mineralization of intermediate products is realized, and the complete elimination of the chlorobenzene pollutants in the groundwater is achieved. The technical method is simple and practical, the process is green, the treatment effect is complete and not prone to rebound, the cost is relatively low, the method is beneficial to large-scale promotion, and the method has remarkable economic, environmental and social effects.

The application relates to the technical field of underground contaminated water remediation, in particular to a hexavalent chromium contaminated underground water remediation device and a remediation method, which comprises a medicine injection pipeline, a sliding rod is arranged on the side of the medicine injection pipeline in a vertical direction, a medicine outlet hole is arranged on the side of the sliding rod, the sliding rod is of a hollow structure and the inside of the sliding rod and the inside of the medicine injection pipeline are communicated, a control assembly and a medicine pressing assembly are arranged on the medicine injection pipeline, the control assembly is connected with the sliding rod and used for adjusting the position of the sliding rod, and the medicine pressing assembly is used for extruding the solution in the medicine injection pipeline through the medicine outlet hole. The application has the effect that the remediation solution can be injected into different depths.