355 results about "Groundwater pollution" patented technology

A rating evaluation method for groundwater pollution source intensity, including: determining pollution source characteristic indices, and weights and scores thereof, according to the type, the discharge mode, the existence time, and the like of a groundwater pollution source; determining an vadose zone antifouling property index and an vadose zone vulnerability index and scores thereof according to vadose zone characteristics; determining a rating evaluation index system for groundwater pollution sources by combining the pollution source characteristic indices with the vadose zone antifouling property index and the vadose zone vulnerability index; and establishing a rating evaluation method for groundwater pollution source intensity and evaluating the groundwater pollution source intensity. The evaluation method comprehensively considers pollution source characteristics and vadose zone characteristics to accurately reflect source intensities of groundwater pollutants and protect groundwater, and may provide a scientific basis to allow for more scientific and rational protection and management of groundwater.

The invention provides a trough for simulating groundwater pollution. The simulated trough at least comprises a trough which is internally filled with an aquifer medium, an aquifuge medium and a lens which are used for simulating typical hydrogeology unit; the simulated trough is provided with an underground water recharge area, a runoff area and a discharge area sequentially from the trough head and the trough body to the trough tail; a hydraulic control device supplies water from the underground recharge area located at the trough head; the runoff area at the trough body comprises a water-distribution and water-rock interaction section containing a porous barrier and a pollution restoration device; the water is discharged out from the discharge area located at the trough tail; the hydraulic control device comprises at least two water boxes with adjustable height; the two water boxes are arranged at two ends of the trough body respectively; a water level difference exists between the two water boxes so as to provide an underwater power field; a plurality of monitoring holes and contamination injection holes are arranged above the trough; and the monitoring holes are connected with the monitoring system. The simulated trough for simulating the groundwater pollution has the advantages of integrating simulating, monitoring and restoring functions into a whole.

The invention discloses an integrated analog device for groundwater pollution process and pollution remediation. The integrated analog device comprises an analog tank, wherein the analog tank is divided into a front part box and a rear part box, one side of each of the front part box and the rear part box is an open end, a permeable reactive barrier is arranged between the open ends of the two boxes, and two side surfaces, corresponding to the open ends of the two boxes, of the permeable reactive barrier are provided with vertically arranged sampling holes; the open ends of the two boxes are concave troughs, and a blocking plate is made of draw-out and insertion steel; the side walls on two sides of the analog tank are respectively provided with sampling holes and monitoring holes; the other sides of the two boxes are respectively provided with an upstream water tank and a downstream water tank, and a porous plate is respectively arranged between the upstream water tank and the boxes and between the downstream water tank and the boxes; and the bottom part of the outer side wall of the upstream water tank is provided with a water inlet hole, the outer side wall of the downstream water tank is provided with vertically arranged overflow holes at different heights, and a water stop valve is arranged at the bottom part of the outer side wall of the downstream water tank. The invention also discloses a method for using the device.

The invention discloses a Fe/C composite porous structure material as well as a preparation method and application thereof. The Fe/C composite porous structure material is characterized by being prepared from low-grade sedimentary iron ore and biomass as raw materials in manners of crushing, mixing, extrusion molding and pyrolysis and reduction reaction in the presence of hydrogen atmosphere at 650-900 DEG C, wherein the main phase composition comprises biomass carbon and zero-valent iron. The Fe/C composite porous structure material disclosed by the invention is high in opening porosity, magnetic susceptibility, adsorbability and biological chemical activity, can be used for treating eutrophicated river water, living sewage and landscape water bodies, or can be used for mediation of underground water pollution and polluted soil.

The invention discloses a groundwater pollution detection evaluation system including a sensor group, a positioning module, a camera module, a monitoring and evaluation center, a transfer node module, a physical model building module, a virtual actuator, a virtual sensor, a simulation analysis module, a water quality state evaluation module, an expert evaluation module, a manual expert module, a display screen and a man-machine operation module. Through a Beidou short message communication technology, data transmission is carried out, a communication line is not needed to be erected, use is convenient, all-around real-time detection of groundwater can be achieved, and thus a plurality of evaluation results are obtained and the accuracy of the detection results is high; moreover, through building the physical model, prediction and simulation analysis are carried out for follow-up situation of the water quality, all kinds of water quality treatment schemes are converted into parameters and then act on the physical model, and the reasonable choice of a water quality treatment scheme is achieved.

A method for evaluating underground water pollution source intensity comprises the steps of determining pollution source characteristic indexes according to underground water pollutant types, characteristics and positions and the like; determining vadose zone characteristic indexes according to vadose zone mediums, underground water depth and permeability coefficient and the like; determining an underground water pollution source intensity evaluation index system in combination with pollution source characteristic indexes and vadose zone characteristic indexes; causing the system to analyze underground water pollution source intensity evaluation indexes, establishing a hierarchical structure matrix, and utilizing an analytic hierarchy process to perform weight assignment on the underground water pollution source intensity evaluation indexes; establishing an underground water pollution source intensity grading evaluation method, and evaluating the underground water pollution source intensity. According to the evaluating method, pollution source characteristics and vadose zone characteristics are considered comprehensively, the underground water pollution source intensity is reflected accurately, underground water is protected; the scientific basis can be provided, and the underground water protection and management are more scientific and more rational.

The invention relates to an integrated movement simulating platform and a simulating and testing method for migration, transformation and a final destination of groundwater pollution. The simulating and testing method comprises the following steps: firstly arranging the movement simulating and testing platform; then filling an aeration zone for simulating a typical hydrogeological unit, aquifer mediums and pollutant repairing mediums for simulating a typical permeable reaction barrier; finally performing a simulation experiment of the migration, the transformation and in-situ repair of the groundwater pollution on the simulating and testing platform. According to the invention, in order to satisfy the need for different experiment procedures, the pollutant entering the simulating and testing platform can be simulated in various manners, the simulation of a persistent pollution source or a provisional pollution source and the simulation of point source pollution or non-point source pollution are realized, and the whole process that the simulated pollutant penetrates through the aeration zone from the earth surface, enters into an aquifer and realizes the migration and the transformation in the aquifer can be clearly observed; the simulation of the migration, the transformation and the in-situ repair of the pollutant in the typical hydrogeological unit can be realized.

An underground water heavy metal pollution remediation device mainly includes a pumping system, a water distribution system, an adsorption reaction zone, a phytoremediation zone, a rapid seepage zone and a monitoring system. The adsorption reaction zone is filled with a medium for the adsorption of heavy metals in order to remove the heavy metals in the underground water. The phytoremediation zone is planted with hyperaccumulator with absorption and enrichment effects on heavy metals, so as to enhance the removal effect of heavy metals. The technique organically combines physical adsorption, chemical adsorption and phytoremediation, and can remediate heavy metals pollution of As, Zn, Cd, Mn, Cu, Cr and Pb and reach good removal effect; replacement of the adsorption reaction medium filler is simple; and the device has low operation cost, and is applicable to groundwater pollution sites in different water depths.

The invention belongs to the technical field of in-situ preparing of polluted underground water, and particularly relates to a device and method for periodic in-situ pumping based integrated repairing of groundwater pollution. The device comprises a polluted underground water pumping system, an in-situ repairing system and a recharge system, wherein the pumping system is composed of a pumping well and a pumping pipeline; the pumping system is connected with the in-situ repairing system; the in-situ repairing system is connected with the recharge system; and the recharge system comprises a recharge pipeline and a recharge well. The pumping well and the recharge well are subjected to a pumping test and a recharge test before the periodic in-situ pumping based integrated repairing of the underground water pollution is carried out. By adopting the method, the processed underground water is recharged to the original polluted water layer to dilute the original polluted water layer, so that the concentration of pollutants in a target aquifer is reduced, convenience is provided for subsequent treatment, and the pollution manage cost is reduced. The processed polluted underground water is timely recharged; and the poor hydrogeololgy and engineering geology can be effectively avoided.

The invention relates to a biological deoxidation denitrification device in oxidative environment groundwater. The device is a double-layer double-media permeable reactive barrier, the permeable reactive barrier is formed by an upstream layer and a downstream layer, the upstream layer is loaded with pine barks, and the downstream layer is loaded with zero valent iron. The invention also provides a biological deoxidation-heterotrophic/autotrophic denitrification combination method in the oxidative environment groundwater. The method comprises a process that the biological deoxidation denitrification device is laid in nitrate nitrogen polluted oxidative environment groundwater pollution plumage downstream soil and an underground water layer, and the device is vertical with the flow direction of the underground water.

The invention belongs to the field of groundwater pollution remediation and specifically discloses biosurfactants-modified nano-iron/carbon and its preparation method and application. The biosurfactants-modified nano-iron/carbon can minimize agglomeration of nano-iron and raise dispersion stability and will not cause secondary pollution. Three biosurfactants including tea saponin, sapindus-saponin and rhamnolipid are used to modify nano-iron, and the modified nano-iron is attached to active carbon, thus removing NO3<->-N in water. Through batch testing, a sedimentation test and a migration test, modification effect on the nano-iron/carbon composite material and its influence on removal efficiency of NO3<->-N are analyzed. The invention provides new thinking and a new method for application of the composite material in groundwater pollution remediation.

The invention relates to a method for producing sodium humate (potassium humate) with a drying method. Firstly, samples of weathered coal or wood coal are analyzed and assayed; the content of humic acid of the samples is calculated; the weathered coal or the wood coal are added into a semiclosed reaction tower; sodium hydroxide (potassium hydroxide) which accounts for 5-20 percent of the weight of the weathered coal and (or) wood coal is added to the semiclosed reaction tower according to the content of the humic acid in the weathered coal or the wood coal and is uniformly mixed with the weathered coal or the wood coal; steam is led inside to heat the weathered coal or the wood coal and the sodium hydroxide (potassium hydroxide) so as to cause the same to react thoroughly; and finally, the product is carried out heat preservation and aged. The invention used for producing the sodium humate (potassium humate) has the advantages of simple process, no black environmental pollution and groundwater pollution and low energy consumption, thereby being beneficial to energy conservation and reducing the production cost.

The invention discloses a sewage interception water-permeable brick which comprises a brick body and filter pieces. The filter pieces comprise bags and filter objects located in the bags. The filter pieces comprise pearl wool sleeves, the non-woven bags and the filter objects located in the non-woven bags. An organic flocculant layer is arranged on the inner surface of each pearl wool sleeve. Each filter object is prepared from, by weight, 20-60 parts of flaky high-strength material, 20-50 parts of fine aggregate and 5-20 parts of binding agent, and the flaky high-strength material, the fine aggregate and the binding agent are mixed and compacted into a blocky structure. The flaky high-strength material is a mixture of one or two or more of long-laid shells, broken earthenware bricks and lamina schist, the fine aggregate is formed by mixing 5-50 parts of alkalescent porous minerals and 0-45 parts of carbonaceous filter materials by weight, and the binding agent is one of high-alumina cement, magnesium oxychloride cement, phosphate binding agent and hydration glass. The water-permeable brick has the beneficial effects that walking is facilitated, and heavy metal, toxic organic substances and colloid of water can be captured so as to avoid groundwater pollution.

The invention discloses an automatic multi-parameter underground water environment layered monitoring well suitable for a polluted site. A plurality of aquifers in a drilling well are packed by a packer, an aquifer stratified sampling device is arranged in each aquifer, the aquifer stratified sampling device comprises a first flow guide pipe, a first tee joint, a first check valve, a second checkvalve, a first underground gas drive mechanism, a first pressure release valve, a first threaded-to-NPT connector, a second threaded-to-NPT connector, a first underground flow storage container, a third threaded-to-NPT connector, a third check valve and a filtering dialysis assembly. According to the invention, automatic underground water environment layered monitoring, water quality multi-parameter automatic detection, staged and hierarchical customized underground water environment monitoring can be realized, good water sample representativeness is achieved, and the integration capacity is further improved. The automatic multi-parameter underground water environment layered monitoring well is suitable for underground water pollution investigation and monitoring in the field of site environment monitoring and the field of geological survey, and the dynamic change rule of underground water chemical properties along with time in the vertical three-dimensional space of a stratum is obtained.

The invention discloses a three-dimensional similar simulation experimental method for groundwater pollution treatment and repair, which comprises the following steps of: (1) determining positions and sizes of a pollution area, a purification area and a permeable reactive area by moving the positions of left and right permeable wallboards; (2) adjusting a bottom sliding grid plate and a lateral sliding grid plate, and determining the position height and the volume size of a pollution source control box; (3) sequentially mounting tempered glass panels on the front and rear sides of a main frame device from bottom to top, sealing, fastening, and filling geological similar bodies and permeable reactive similar materials once in the pollution area, the purification area and the permeable reactive area until the simulation altitude is met when every group of tempered glass panels is mounted; (4) filling pollution source similar bodies and connecting external water injection hoses, and realizing flow characteristic simulation in the pollution area, the purification area and the permeable reactive area; (5) observing and recording various indexes of the pollution area and the purification area according to the time similarity requirements. The method is reasonable in filling and simple and convenient in operation, and the representation of the groundwater pollution treatment and repair process is guaranteed.

The invention discloses a preparation method of modified zero-valence nano-iron suspension suitable for underground water pollution in-situ remediation, and particularly relates to a process for performing modification through unmodified zero-valence nano-iron with small particle size and high activity. Through the composite zero-valence nano-iron modified by sodium polystyrene sulfonate, the zero-valence nano-iron can be stably dispersed and migration of the zero-valence nano-iron in underground water can be promoted under the condition of maintaining zero-valence reaction activity, thereby saving the investment and the engineering cost of the zero-valence nano-iron. According to the method, not only the zero-valence nano-iron can be stably dispersed, but also the migration of the modified zero-valence nano-iron is promoted; and the method has the advantages of less using amount of a dispersing agent and low cost.

The invention relates to a method for in-situ reduction restoration of polluted groundwater. In a groundwater pollution zone, by injecting formate and persulfate into an underground environment through two injection wells and performing thermal activation on the persulfate and the formate, carbon dioxide ion free radicals with high reducibility are prepared to reduce heavy metals and chlorinated organic pollutants and remove target polluted components, so as to achieve an aim of restoration. According to the method provided by the invention, activation is realized by heating without externally adding transition metals, and the generation of free radicals and the removal of pollutants can be achieved under the condition that chemical conditions including a pH value, a dissolved oxygen content and the like of the groundwater are not adjusted. A carbon dioxide free radical is a high-reducibility free radical, reacts quickly and efficiently with the pollutants, and can be widely applied to restoration of underground polluted environments.

The invention relates to the field of groundwater evaluation. The process of groundwater pollution evaluation is divided into an self-help expert system which can be realized in an online and an expert evaluation system which can be realized in an offline way. According to the online expert system, the groundwater pollution assessment is divided into 8 categories, 35 sub categories and hundreds of subdivision tasks. For each subdivision task, the expert system provides a sample answer and a detailed explanation. After technical representatives of a commissioning party are trained in an unified way, the groundwater pollution preliminary evaluation can be carried out independently on the basis of using online resources. A detailed technical document is generated by the preliminary evaluation, and the prototype of an evaluation report is formed. On the above basis, groundwater assessment experts and the technical representatives of the commissioning party carry out project communication in an online way, a groundwater numerical model is subjected to examination and improvement, and an evaluation report draft is modified and processed. When the evaluation is completed, the ability building and fruit transfer of the commissioning party are completed at the same time.

The invention relates to the technical field of environmental investigation, and discloses an environmental investigation method for groundwater chlorohydrocarbon pollution, which comprises the following steps: S1, first-stage investigation is made; S2, result analysis is made: if a first-stage survey confirms that there is no possible pollution source in a working area and a surrounding area currently and historical, the survey activity can be ended, and if the pollution source existing inside and outside the working area cannot be eliminated, the second-stage environmental survey is carriedout; S3, second-stage investigation and preliminary sampling analysis. According to the invention, geological and hydrogeological conditions of an investigation area are found in detail; pollution source distribution of an investigation area is found out in detail, types and components of concerned pollutants are determined, the spatial distribution range of main pollutants in soil and underground water is delineated, the pollution degree of the soil and the underground water of the investigation area is evaluated and subjected to risk assessment, and a scientific basis and data support are provided for next-step treatment, restoration and safe utilization work. Development of groundwater pollution dynamic monitoring.

The invention provides a method for adding CO2 and O2 in-ground leaching in heavy carbonic acid type ground water and leachate, which comprises the following steps: (1) adding CO2 and O2 into the leaching solution to leach uranium underground to obtain uranium leachate; (2) adding uranium to the uranium Add CO2 to the leaching solution to adjust the pH value of the uranium leaching solution, and then filter it mechanically; (3) perform ion exchange adsorption on the uranium leaching solution in the adsorption tower; (4) perform leaching on the saturated resin to obtain Cl-type poor resin and leaching qualified solution (5) transforming the Cl-type poor resin with the adsorption tail liquid; (6) acidifying the eluting qualified liquid, adding alkali and aging precipitation at room temperature, washing, filtering and drying the precipitated slurry to obtain uranium products. The method of the invention only adds O2 and CO2 without adding other reagents, which will not cause blockage of ore beds and pollution of underground water; at the same time, the preparation process is integrated, the operation is simplified, and the cost is saved.

The invention belongs to the field of groundwater pollution remediation. A purpose of the invention is to provide an in-situ oxidation circulation extraction remediation system and a remediation method for organic contaminated underground water. According to the system and the method, the real-time monitoring and evaluation of the in-situ oxidation remediation effect of organic polluted underground water can be realized, the agent adding frequency is effectively guided, the secondary pollution risk is reduced, the agent cost is saved, and the construction period is shortened. According to thetechnical scheme, the in-situ oxidation circulation extraction remediation system for organic polluted underground water comprises an in-situ oxidation system, a circulation extraction system and a monitoring system, wherein the circulation extraction system comprises an extraction well arranged in an organic pollution area, an injection well arranged around the extraction well, at least an extraction pump arranged in the extraction well, at least an extraction pipe extending into the extraction well and communicated with the extraction pump, and a circulation injection pipe extending into theinjection well and communicated with the extraction pipe.