80 results about "Groundwater quality" patented technology

The invention discloses a passivator used for in-situ repairing of polluted farmland soil. The passivator comprises raw materials including an iron-based compound, lime charcoal and bentonite. The passivator includes, by weight, 8-30 parts of the iron-based compound, 10-30 parts of the lime charcoal and 20-40 parts of the bentonite. The passivator has the beneficial effects that the sources of reagents adopted in the passivator used for repairing arsenic polluted soil are wide, the cost is low, secondary pollution cannot be caused on soil, a synergistic effect is achieved among different materials, the repairing efficiency is high, and the effect is obvious. When in-situ repairing is conducted on the arsenic polluted soil, the surface of the soil is covered with a repairing material, the 0cm-30 cm surface layer of the soil is evenly mixed with the repairing material in a plough manner, water is added for one week of curing, the leaching concentration of the heavy metal arsenic in therepaired farmland soil is detected, the soil is qualified when the leaching concentration is smaller than the III standard of the Quality Standard for Underground Water (GB/T14848-93), and if the leaching concentration cannot reach the standard, the curing time is prolonged.

The invention discloses a chemical-giant reed combined ecological recovery method of polymetal polluted soil in mining and metallurgy zones. According to the method, ecological recovery of the polymetal polluted soil in mining and metallurgy zones is carried out with the combination of a soil chemical modifier and by a reasonable cultivation technology of giant reed with strong anti-adversity ability, fast growth speed and large biomass. In the planting year, a proper amount of base fertilizer is applied to promote rapid survival and reproduction of giant reed seedling. In the next year, giant reed grows and reproduces automatically and an ecological system is gradually formed. After chemical-giant reed combined ecological recovery of the polymetal polluted soil, the concentration of As, Cd, Cu, Pb and Zn in underground water reaches Underground Water Quality Standard (GB/T14848-93) III; and the giant reed overground part biomass dry weight per year can reach 15000kg/ha. After charingor liquefaction, the giant reed harvest can be returned to a heavy metal technology as a bio-energy raw material for comprehensive utilization.

The invention relates to a soil leakage liquid and surface runoff interception and purification system and a soil leakage liquid and surface runoff interception and purification method suitable for heavy metal pollution areas in the south. The system and the method are mainly used for controlling pollution dispersion in the heavy metal pollution areas and comprise the functions of intercepting water and soil loss in the pollution areas, purifying soil leakage liquid and runoff and repairing and enhancing degraded wetland. The system and the method are low in building, operation, maintenance and management costs, avoid energy consumption, have good interception and purification effects, can reduce the water and soil loss quantity in the pollution areas by over 90 percent, can treat water discharged from the system so as to enable the water quality to reach the national Environmental Quality Standard for Surface Water (GB3838-2002) and the III standard of the Quality Standard for Ground Water (GB/T14848-93), have a wide technological adaptive range, and can be popularized and applied in different types of heavy metal pollution areas in the south.

The invention relates to a method for remediating nitrate pollution in underground water, and the advantage of the method lies in that nitrite accumulation problem caused by conventional microorganism remediation methods is solved. According to the method, a biological reaction wall portion and an aerobic well portion are comprised. The biological reaction wall consists of a solid-phase carrier medium serving as an organic carbon source that can slowly release organic carbon and oxygen capturing agent. The aerobic well is filled with solid filler that can slowly release oxygen, or a suspension of a medium that slowly release oxygen is poured into the aerobic well. The oxygen is released into underground environment by using the aerobic well, so that dissolved oxygen in the environment is improved. Nitration is carried out under an aerobic condition, so that accumulated nitrite is converted into a small mount of nitrate again. The method effectively solves the problem of excessive nitrite in effluent, nitrate content in the final effluent is small, and the concentration of the nitrate in the final effluent is lower than the III classification standard in Quality standard for ground water GB/T 14848-1993, so that no secondary pollution on the underground water will happen.

The invention discloses a groundwater recharge simulation experiment method, which is realized on a groundwater recharge simulation experiment platform. The experiment platform comprises a dynamic water level simulation device, an aeration zone simulation device, a rainfall irrigation simulation device and a groundwater recharge simulation device. The evolution of a groundwater flow field during the recharge process is simulated by adding different pollution sources to the aeration zone simulation device. Various potential groundwater quality pollution influencing factors during the groundwater recharge process are simulated in a pollution correlation simulation device, and various key parameters are obtained.

The invention discloses a method for repairing arsenium-polluted farmland soil through microorganisms and plants in a combined manner. The method includes the following steps that firstly, a microbial agent is sprayed, wherein nodule bacteria are sprayed in the arsenium-polluted farmland soil after being dissolved in water; secondly, plant plantation is conducted, wherein Nephrolepiscordifolia(L.)Presl is planted in the arsenium-polluted farmland soil where the nodule bacteria are sprayed; and thirdly, field management is conducted, wherein the field management is conducted on the Nephrolepiscordifolia(L.)Presl, and normal growth of the plants is ensured. Treatment of arsenium-polluted farmland soil repair is conducted through the microorganisms and the plant repair technology in a combined manner, the nodule bacterium NT-26 and Nephrolepiscordifolia(L.)Presl combined repair is adopted, the leaching concentration of the heavy metal arsenium in the repaired and treated farmland soil is smaller than the IV-type standard in Quality Standard for Ground Water (GB/T14848-93), the whole construction process is high in benefit, and influences on the environment are small.

The invention discloses a method for processing low concentration arsenide in water. The water is suitable for processing low concentration arsenide in water, or carrying out deep treatment on high concentration arsenic-containing wastewater. The method organically combines a traditional flocculation coprecipitation technology with a hydroxyl free radical oxidation system, iron ions and hydrogen peroxide form hydroxyl free radicals with extremely strong oxidizability, a Fe-(.OH) reaction system composed of the iron ions and hydroxyl groups can efficiently complete conversion of trivalent arsenic, an iron ion complex generated in the .OH generation process continuously participates in a reaction to generate FeAsO4 with very small solubility, and the arsenide is removed in a precipitate form. The method enhances the adsorption and coacervation effects of fine particles difficult to settle, and the processed arsenide concentration can meet III type water quality requirements in Underground Water Quality Standard (GB/T14848-93).

The invention relates to a comprehensive evaluation method of underground water, wherein the method includes steps of a, re-classifying the classification dividing value of seventeen water quality indexes such as manganese, fluoride, monoiodide and mercury in the underground water quality; b, selecting the water quality index participated in rating according to the testing index of the underground water sample, and substituting the testing result of the underground water sample and the classification dividing value of the selected water quality index participated in the evaluation to a membership function, and calculating and acquiring a fuzzy membership matrix; c, performing data conversion on a toxic index of the water quality index; d, according to the converted toxic index, the sample testing result, and the classification dividing value of the water quality index, calculating a weight matrix; e, coupling the fuzzy membership matrix with the weight matrix, and acquiring the evaluation result matrix and the evaluation grade of the underground water quality. The evaluation result fully considers about the risk of the human body health, and can comprehensively evaluate the underground water quality from the view of the human body health risk; the evaluation result can further objectively reflect the drinking safety.

The invention provides a GRRM model-based groundwater environment risk evaluation method for a hydrogeological unit. The method comprises the steps of performing risk source assignment according to a risk source type based on spatial distribution of a risk source through a hydrogeological division risk evaluation unit; by taking groundwater quality, groundwater level and groundwater source area sensitivity as risk suffers, calculating risk suffer sensitivity; determining damage degrees of the risk source to a groundwater system and the risk suffers, and obtaining an exposure response coefficient; calculating a groundwater anti-pollution performance index by integrating weighted hydrogeological parameters; and obtaining a groundwater relative risk evaluation result through relative risk model calculation, and performing representation on a groundwater environment in combination with the groundwater relative risk evaluation result. By obtaining the risk source assigned value of the risk evaluation unit, the risk suffer sensitivity, the exposure response coefficient and the groundwater anti-pollution performance index, the groundwater relative risk evaluation result can be comprehensively, quickly and accurately calculated and analyzed, so that the reliability of groundwater relative risk evaluation is improved.

The invention belongs to the technical field of groundwater monitoring and particularly relates to a groundwater layered monitoring well suitable for multiple aquifers. The groundwater layered monitoring well suitable for multiple aquifers includes: a single-hole multi-layer shaft frame, a single-hole multi-layer sampling subsystem for sampling from the single-hole multi-layer shaft frame, and a single-hole multi-layer monitoring subsystem for monitoring the sampling information of the single-hole multi-layer sampling subsystem. The groundwater layered monitoring well reduces a cost, efficiently and practically realizes single-hole multi-layer monitoring of multiple aquifers of groundwater, satisfies the technical requirements on the domestic groundwater quality in-situ high-precision long-term sequence monitoring and single-hole multi-layer monitoring and well serves evaluation and protection of groundwater resources.

An underground sampling tool (HTMS) for underground water analysis of both quality and flow rate, providing the information required to perform an underground drilling and obtain uncontaminated water for crop irrigation, said tool comprising: a housing for the electronic and electrical controls, a housing for the hydraulic means controlled by the electric and electronic portion of the tool, a test body consisting of a variety of hydraulic circuits for operating the various operating valves of the tool, wherein said test body further comprises: a rear shoe on an axial axis of the tool, wherein said rear shoe is driven by two telescoping pistons simultaneously that arise from the inside of the tool when driven by a signal of a surface equipment operably enabled for this purpose, and a front shoe, driven by several pistons which are housed below the front shoe, not shown in the figures, and driven by one or more electro-pneumatic devices acting jointly and generating a progressive forward or backward movement of the front shoe. Process for the collection and analysis of samples in a wellbore using said tool.

The invention discloses a preparation method of a water body molybdate adsorbent based on solid waste steel slag, belonging to the field of water body pollutant adsorbing materials. The preparation method comprises the following steps: (1) grinding steel slag, rinsing and naturally drying; (2) carrying out particle size screening, and modifying the obtained solid respectively with sulfuric acid, lanthanum chloride and cetyl trimethylammonium bromide (CTMAB); and (3) cleaning with deionized water, and drying to obtain the La-CTMAB-modified steel slag adsorbing material. After the ground surface sewage with the molybdate concentration of 5 mg/L is treated by the adsorbing material, the water body molybdate content reaches the Groundwater Quality Standard (GB/T14848-9) Class IV (<=0.5 mg/L). The method has the characteristics of low cost, high adsorption efficiency, wide applicability and the like, implements waste recycling, and brings in favorable social benefits and economic benefits.

The invention provides a stabilization repairing agent for soil pollution, wherein the agent includes components such as quicklime, potassium dihydrogen phosphate, phosphate rock powder and demineralized and modified humic acid, and is prepared from, by mass, combination of the components. After the stabilization repairing agent is applied to soil contaminated by lead and cadmium and is subjectedto stabilized treatment and maintenance for one week, the concentration of lead and cadmium in a leach liquor of the soil can meet standards of groundwater quality class IV. The mixed component in thestabilization repairing agent of the invention fully exerts a synergistic effect, the effective state of heavy metals in the soil can be reduced by the action of precipitation, adsorption, improvement, pH adjustment, and the like, and the prepared soil repairing agent has good effects in repairing lead and cadmium contaminated soil. The stabilization repairing agent for the soil pollution has theadvantages of simple preparation method, feasibility and good treatment effect.

The invention provides a cyclic extraction type groundwater quality detection equipment system. The system comprises an extraction pipe, a self-priming pump, a water inlet pipe, a water tank, a watertank outlet pipe and a water return pipe, wherein the lower end of the extraction pipe extends into a sampling well; an inlet of the self-priming pump is connected with the upper end of the extractionpipe; the water inlet pipe is connected with an outlet of the self-priming pump; a water inlet of the water tank is communicated with the water inlet pipe, and a plurality of water quality parametersensors with different indexes are distributed in the water tank; the water tank outlet pipe is communicated with a water outlet of the water tank; the upper end of the water return pipe is connectedwith the water tank outlet pipe, and the lower end extends into the position, below the groundwater level and close to the water surface, of the sampling well. A water sample is extracted from the bottom of the sampling well, water quality is detected by detection equipment on the ground, meanwhile, the water sample is not reserved, the extracted groundwater is reinjected into the upper water level layer of the same sampling well in real time, groundwater sampling is facilitated for a technician while groundwater quality is monitored on line, disturbance to quality of sampling water from the well bottom is reduced to the greatest extent, and water level in the well is guaranteed.

The invention provides an administrative region groundwater environment risk assessment method based on a GRRM model. The method comprises steps: a risk assessment unit is divided according to an administrative region, and the risk source pressure density of the risk assessment unit is calculated; with the groundwater quality and the groundwater supply ability as risk receptors, the risk receptor sensitivity is calculated; the damage degree of the risk source to the groundwater system and the risk receptor is determined, and an exposure response coefficient is obtained; a hydrogeological parameter is weighted comprehensively to calculate a groundwater anti-pollution performance index; and through a relative risk model, the groundwater relative risk assessment result is calculated and obtained, and in combination with the groundwater relative risk assessment result, the groundwater environment is characterized. Through acquiring the risk source pressure density of the risk assessment unit, the risk receptor sensitivity, the exposure response coefficient and the groundwater anti-pollution performance index, the groundwater relative risk assessment result can be calculated and analyzed comprehensively, quickly and accurately, and the reliability of the groundwater relative risk assessment can be improved.

The invention belongs to the technical field of groundwater treatment, in particular to a deionization treatment method for groundwater in a neutral in-situ leaching uranium mining well site. The method includes the following steps that: the well site groundwater lifted from a deep well pump to a liquid collection tank is first filtered by quartz sand and bag filter; and the well site groundwaterafter filtering up to the standard is called raw water, and the groundwater continues to enter a composite electrode, the working process and regeneration process are carried out in sequence, and thetwo processes are cyclic. The method can realize the recycle rate of the clear liquid of 50 %-85 %, the uranium concentration of the clear liquid is less than 5 mg/L, the conductivity is less than 300us/cm, and the TDS, sulfate and total hardness of the clear liquid can meet the requirements of the second-class groundwater quality standard. Compared with the traditional RO method, the energy consumption is low and no secondary pollution is generated. The generated purified water can be reused for the process steps of dispensing medicine and the like in the front section of a system; and meanwhile, the generated concentrated liquid can return to the front end of leaching of uranium ore for further enrichment through ion exchange process.

Provided are low flow groundwater fluid sampling systems and related methods of collecting fluid samples, including a low flow pump, flow cell, waste container and a communication device in communication with those components. In this manner, the low flow pump may be controlled to ensure a desired constant flow-rate is achieved, and a remote operator may monitor the status of fluid being pumped to the flow cell with the communication device, such as with a portable electronic device, including a smart phone. The system may alert the operator that fluid is ready to be collected for sampling, including at an off-site laboratory. Particularly useful applications are for monitoring groundwater quality and contamination.

A multi-parameter water quality detection method comprises the steps as follows: (1) preparing a standard solution, (2) creating a standard curve, 3) sampling a sample, 4) preprocessing the sample, 5) performing experimental determination and 6) calculating permanganate index concentration, ammonia nitrogen concentration and total nitrogen concentration. A multi-parameter water quality detector comprises a main unit body provided with a storage bin and an experiment bin. According to the detection method, detection of a permanganate index, ammonia nitrogen, total nitrogen, nitrite nitrogen and nitrate nitrogen of a to-be-detected substance is realized through an absorption spectrum, the operation procedure is simplified, the on-line condition of the detector is facilitated, the defects of many required instruments and high cost of the different traditional methods are overcome, multiple parameters can be detected on line in real time by one detector, the measurement time is short, the accuracy is high, the detection limit is low, the lowest detection limit of total nitrogen is 0.5 mg/L, the lowest detection limit of ammonia nitrogen is 0.1 mg/L, the lowest detection limit of the permanganate index is 0.1 mg/L, and the detection requirements of the Quality standard for ground water and the Environmental quality standards for surface water (GB3838-2002) for total nitrogen, ammonia nitrogen and the permanganate index can be met.

The invention discloses a method for preparing a water body sexavalent molybdate adsorbent based on waste iron-aluminum mud of water plants and belongs to the field of water body pollutant adsorptionmaterials. The method specifically comprises the following steps: (1) washing iron-aluminum mud in clean water, drying naturally, grinding, and screening; (2) putting the iron-aluminum mud into a quartz crucible, performing pyrolysis in a muffle furnace, and cooling and uniformly mixing in a drying tank for later use; and (3) putting the iron-aluminum mud of the step (2) into a 1.0 g L<-1> fulvicacid solution in a solid to liquid ratio of 1:1, oscillating for 4-5 hours, and drying for later use. After ground sewage of which the molybdate concentration is 5 mg <-1> is treated with the adsorption material, the content of molybdate in the water meets the IV class (less than or equal to 0.5 mg/L) of the underground water quality standards (GB/T 14848-9). The method has the characteristics ofbeing low in preparation cost, high in adsorption efficiency, wide in application, and the like, and resource utilization of wastes is achieved.

The invention provides a microbial remediation method for heavy metal contaminated soil in a retired slag yard of a smelting plant. The method comprises the following steps of: selecting mixed bacteria of sulfate reducing bacteria and iron reducing bacteria, culturing in a liquid culture medium containing Zn<2+>, Pb<2+> and Cr<6+> under a neutral condition until the concentration of Zn<2+>, Pb<2+> and Cr<6+> in the culture medium is lower than that of a detection line, selecting strains in a bottle for transferring, and gradually increasing the concentration of Zn<2+>, Pb<2+> and Cr<6+> for gradient domestication; and adding the domesticated bacterial liquid into polluted soil, wherein the addition amount of the bacterial liquid is that the mass volume ratio (g: mL) of the soil to the bacterial liquid is 1: 1-3: 1. After culture is performed for 4-7 days at the temperature of 30-35 DEG C, the soluble Zn<2+>, Pb<2+> and Cr<6+> in the remedied soil are lower than 0-0.05 mg/L, 0-0.05 mg/L and 0-0.05 mg/L, and the groundwater quality standard III-type water standard is met.

The invention discloses an online monitoring device for groundwater quality. The online monitoring device comprises a buoyancy device, wherein the buoyancy device comprises a hollow through structure;a sensor is arranged in the through structure; the bottom of the buoyancy device downward extends to form a hollow-out body. The online monitoring device for the groundwater quality has low equipmentexpenses and high working efficiency, and can perform long-term dynamic monitoring for groundwater.

The invention discloses a biological reaction well group and an underground water in-situ reinforced biological reaction wall and an arrangement method thereof. The biological reaction well groups areonly distributed at the boundary of the groundwater pollution range to be controlled and near the boundary of the groundwater pollution range. The first row of the biological reaction well group is distributed along the boundary line of the underground water pollution range to be controlled. The second row of the biological reaction well group is arranged towards the inner side of the boundary ofthe groundwater pollution range and is distributed on a perpendicular bisector which takes a connecting line of any two adjacent biological reaction wells in the first row as a bottom edge. The biological bacteria diffuse in the biological reaction well group at the boundary of the groundwater pollution range to form a closed biological reaction wall, carbon, nitrogen, phosphorus and other nutrient substances are regulated and controlled through the biological reaction well to continuously operate and maintain the biological reaction wall, and the purpose of controlling the groundwater pollution range not to be enlarged can be achieved without repairing the groundwater quality in a large range. The implementation method is simple, and the cost is controlled.