CN114988556B - Method and device for enhancing migration of repairing agent in low-permeability area based on circulating well - Google Patents
Method and device for enhancing migration of repairing agent in low-permeability area based on circulating well Download PDFInfo
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- CN114988556B CN114988556B CN202210733676.6A CN202210733676A CN114988556B CN 114988556 B CN114988556 B CN 114988556B CN 202210733676 A CN202210733676 A CN 202210733676A CN 114988556 B CN114988556 B CN 114988556B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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Abstract
The invention relates to a method for enhancing migration of a remediation agent in a low-permeability area based on a circulating well, which at least comprises the following steps: a circulating well capable of pumping and injecting water in the same well is arranged in a range close to the low-permeability area; determining a low permeability zone and disposing at least one injection point at a location proximate to the low permeability zone; injecting a repairing agent into the injection point, and injecting a catalyst into the circulating well; under the hydraulic excitation of the circulation well, water output by the circulation well applies a vertical and/or inclined downward driving force to the low-permeability area, so that the repairing agent is strengthened to vertically migrate and permeate into the low-permeability area. Aiming at the difficulty that the repairing agent cannot permeate into the low-permeability area in the prior art, the invention mainly couples the circulating well technology and the in-situ chemical oxidation technology, can strengthen the penetrating of the repairing agent into the low-permeability area and keep the repairing agent for a long time, does not need to add polymers, and improves the possibility of contact between the oxidizing agent and pollutants in the low-permeability area.
Description
Technical Field
The invention relates to the technical field of in-situ remediation of groundwater pollution, in particular to a method and a device for enhancing migration of a remediation agent in a low-permeability area based on a circulating well.
Background
In Situ Chemical Oxidation (ISCO) is considered an effective technique for remediation of organic contaminants in soil and groundwater, and has found wide application due to its high efficiency of treatment, cost effectiveness, and ease of operation. The injection of oxidants into the subsurface allows the contaminants to mineralize into carbon dioxide, water and other inorganic substances, or to be converted into compounds that are less mobile or toxic than the original form. The most commonly used oxidants include ozone, fenton, permanganate and Persulfates (PS).
The efficiency of contaminant removal in an aquifer is primarily dependent on the uniform distribution of the remediation agent in the contaminated area and its contact with the contaminants. And after the oxidant is injected into the stratum, the oxidant is only influenced by the action of water flow which transversely migrates, so that the migration speed of the oxidant is low, and the repair efficiency in a polluted area is low.
The subterranean environment is typically a heterogeneous formation, forming a preferential flow path in the high permeability zone and, in addition, the agent may float or sink during migration in the aquifer due to the density differential between the injected solution and the groundwater, which density effect causes the oxidant migration process to form a bypass phenomenon, which is common in the remediation of the agent delivery and aquifer remediation. To address the issue of preferential flow caused by heterogeneous and density effects, a common solution is to enhance the cross-flow between porous media with different permeabilities by injecting water-soluble and shear-thinning polymers. However, the additionally added polymer not only changes the migration path of the oxidizing agent but also changes the migration path of the contaminant, so that the efficiency of the oxidizing agent is limited. Adding additional agents to the formation not only increases the cost of construction but also affects the bio-geochemical properties of the formation.
Chinese patent CN106186123a discloses a low permeability contaminated site circulation controllable groundwater remediation system, wherein: a pumping well is arranged at the central position of the groundwater pollution plume with the permeability coefficient of 1-0.01 m/d, and the pumping well is connected with the groundwater distribution pool through a pumping water guide pipe; a plurality of water injection wells are arranged around the periphery of the underground water pollution plume, water injection guide pipes are arranged in each water injection well, and each water injection guide pipe is connected with the underground water distribution pool through the pollution multistage reinforcement treatment unit. The invention influences the flow direction of the ground stream by arranging a plurality of water injection wells. However, the arrangement of a plurality of water injection wells is labor-and time-consuming, and because the water injection wells and the pumping wells are arranged in the aquifer above the water-resisting layer, only the transverse permeation of the groundwater can be promoted, and the vertical migration of the groundwater still cannot be promoted.
Chinese patent CN109047302a discloses an in-situ aeration repair method for low permeability zone VOCs polluted groundwater, based on the surfactant reinforced aeration repair method, the low permeability zone is subjected to multi-point hydraulic fracturing by adopting a point-position adjustable hydraulic fracturing technology, a large number of artificial cracks are generated in the zone, and meanwhile, the pressure solution used for fracturing is a surfactant solution, so as to enhance the gas permeability of the low permeability zone, strengthen the desorption capability of pollutants from fine-grained soil, and solve the difficult problem that the low permeability zone is not easy to repair. The hydraulic fracturing technology adopted by the invention cooperates with the strengthening effect of the surfactant, the pressure solution used in the fracturing process is SDBS surfactant solution with the concentration of 200-400 mg/L, the inside of the hydraulic fracturing well is a coaxial double-pipe pipeline, and the multi-point hydraulic fracturing of different areas is realized by moving the inner pipe. However, the present invention has a problem in that a surfactant solution is injected into the subsurface while repairing, thereby introducing a new polymer.
Chinese patent CN103043862 a discloses an in-situ groundwater repairing device based on synchronous shattering hydrodynamic circulation, which comprises more than two hydrodynamic shattering wells and more than one pneumatic stripping circulating well, wherein the pneumatic stripping circulating well is a double-layer well, an upper screen and a lower screen are arranged in the well, an inner well is connected with an inflator pump, an outer well is connected with an extraction pump, and is connected with a gas treatment device outside the well through a pipeline; the hydraulic vibration fracturing well is characterized in that a fracture layer generated by hydraulic fracturing exists in a low-permeability soil layer, and a fracturing propping agent is injected into the fracture; the cracks are generated by synchronous hydraulic fracturing of two paired hydraulic shattering wells; the device also comprises a hydraulic fracturing pump, a surfactant dosing tank and the like. The invention uses physical method (shattering) to destroy low permeability soil layer, increase stripping efficiency of VOC in groundwater, and achieve repair efficiency. Compared with the invention, the technology has larger destructiveness to stratum and no restoration effect to non-volatile pollutants. Based on the defect, the invention drives the repairing agent to migrate to the low-permeability area in the groundwater through the hydraulic driving action of the circulating well, has concentration accumulation effect, and can repair the pollutants remained in the low-permeability area.
Chinese patent CN113714271a discloses an in-situ chemical oxidation process coupled to an underground water circulation well for environmental remediation, comprising the steps of: s1, preparing an oxidant; in the oxidation process, raw materials used for the oxidant need to be prepared in a laboratory and the like for the next oxidation. S2, extracting and assaying the groundwater; groundwater is pumped from wells at different depths or in different contaminated areas, and assay analysis is performed on the different groundwater. S3, selecting an in-situ repair oxidant; the four main oxidants used for in situ remediation are permanganate, persulfate, hydrogen peroxide and ozone, respectively. Although the invention proposes to use circulation wells for remediation, the oxidant is injected through the circulation wells and migrates based on water flow, the purpose of which is to diffuse the remediation range of the oxidant rather than to cause the oxidant to have a concentration build-up effect in the low permeability zone. Since the low-permeability region has a good repairing effect only on the low-concentration repairing agent, the repairing agent without the step concentration difference is difficult to accumulate in the low-permeability region. Moreover, because the distance between the circulating well and the low-permeability area is uncertain, the oxidant circulating in the circulating well firstly transversely migrates and then vertically migrates, the concentration of the oxidant is unchanged or smaller, the oxidant reaching the low-permeability area flows out along with water, the oxidant migrates obliquely downwards, the vertical migration effect is poor, and the concentration accumulation effect cannot be realized on the basis that the oxidant is gradually diluted along with the circulation. Based on the defect, the injection point of the repairing agent is arranged above the low-permeability area, the low-concentration repairing agent in the low-permeability area is vertically migrated through the hydraulic action of the circulating well, and the hydraulic force drives the repairing agent with a certain concentration to vertically migrate into the low-permeability area every time, namely the concentration of the oxidizing agent entering the low-permeability area every time is not diluted and the concentration of the oxidizing agent is not lower and lower, so that the stability of the osmotic concentration of the repairing agent is ensured, and the concentration accumulation effect of the oxidizing agent in the low-permeability area can be realized.
In view of the foregoing, the prior art has not yet provided a method for facilitating enhanced migration of a remediation agent in a low permeability zone without injecting additional polymer into the subsurface and without providing multiple injection wells.
Furthermore, there are differences in one aspect due to understanding to those skilled in the art; on the other hand, since the applicant has studied a lot of documents and patents while making the present invention, the text is not limited to details and contents of all but it is by no means the present invention does not have these prior art features, but the present invention has all the prior art features, and the applicant remains in the background art to which the right of the related prior art is added.
Disclosure of Invention
In the prior art, difficulties in the application of in situ chemical repair to low permeability areas include: firstly, the repairing agent cannot permeate into the low-permeability area, so that the treatment of the polluted low-permeability area becomes a great difficulty in site repair; secondly, the vertical migration of the repairing agent is greatly limited due to the effect of groundwater flow and self gravity, the repairing agent is carried by the water flow when the repairing agent does not reach the middle and lower layers of the stratum, and the influence range is limited.
Aiming at the defects in the prior art, the invention couples the circulating well with the in-situ chemical oxidation technology, can strengthen the penetration of the repairing agent into the low-permeability area and keep the repairing agent for a long time, does not need to add polymers, and improves the pollutant degradation efficiency of the low-permeability area. Under the action of hydraulic excitation of the circulating well, the vertical migration distance of the repairing agent is improved, and the influence range of the repairing agent in the stratum is enlarged.
The invention provides a method for enhancing migration of a remediation agent in a low-permeability area based on a circulating well, which at least comprises the following steps: a circulating well capable of pumping and injecting water in the same well is arranged in a range close to the low-permeability area; determining a low permeability zone and disposing at least one injection point at a location proximate to the low permeability zone; injecting a repairing agent into the injection point, and injecting a catalyst into the circulating well; under the hydraulic excitation of the circulation well, water output by the circulation well applies a vertical and/or inclined downward driving force to the low-permeability area, so that the repairing agent is strengthened to vertically migrate and permeate into the low-permeability area.
The circulating well has the function of promoting groundwater remediation. The circulating well and the repairing agent are matched for use, the repairing agent can effectively and vertically migrate under the hydraulic excitation action of the circulating well, the acting range of the repairing agent is greatly strengthened, the specific acting range is determined according to the water pumping and injecting flow rate, and the larger the water pumping and injecting flow rate is, the larger the influence radius is.
Preferably, the method further comprises: the location proximate the low permeability zone includes a region vertically above the permeability zone and a region between the low permeability zone and the circulation well location. The closer the injection to the low permeability zone, the more beneficial the healing agent will be to aggregate in the low permeability zone. If the remediation agent is far from the low permeability zone, the circulation well cannot migrate vertically by hydraulically exciting the remediation agent. The repair agent is injected near the low permeability area to enable the repair agent to vertically migrate under the excitation action of hydraulic power.
Preferably, the method further comprises: injecting a low-concentration repairing agent from the injection point in a multi-injection mode; the concentration range of the low-concentration repairing agent is 1-10 mmol/L. The higher the concentration of the healing agent, the more detrimental it is to its aggregation to the low permeability zone. Thus, for the remediation of low permeability zones, multiple injections of low concentration remediation agent are considered to ensure that the remediation agent accumulates at higher concentrations in the low permeability zone.
Preferably, the method further comprises: under the condition that the repair site is a DNAPL site, injecting a high-concentration repair agent into the injection point, and applying a vertical and/or inclined downward driving force to the DNAPL site by water output by a circulating well under the action of hydraulic excitation of the circulating well so that the high-concentration repair agent effectively and vertically migrates; the concentration range of the high-concentration repairing agent is 10-20 mmol/L. According to the invention, the repairing agent with different concentrations is injected at different positions in a distinguishing way, so that the using amount of the repairing agent is optimized. The high concentration of healing agent facilitates its own vertical migration. The DNAPL site repair can be carried out by adopting a high-concentration repairing agent for one-time injection.
Preferably, the method further comprises: in the experimental simulation equipment, the range of the pumping water flow rate of the circulating well is set as follows: 0.58-1.74 mL/h.
Preferably, the low permeability zone is less affected by hydraulic excitation of the circulation well, and the concentration of the remediation agent in the low permeability zone can be maintained for a longer period of remediation; the longer repair time ranges are: not less than 9 hours. Compared with the impermeable difficulty of the low-permeability area in the prior art, the repairing agent disclosed by the invention is easy to permeate into the low-permeability area, can be kept in the low-permeability area for a long time with a certain concentration, and has a remarkable repairing effect on the low-permeability area.
Preferably, the concentration of the repair agent injected from the injection point is positively correlated with the distance between the injection point and the low-permeability region, wherein the concentration of the repair agent injected from the injection point tends to be low in a tendency that the distance between the injection point and the low-permeability region becomes small. According to the characteristics of the influence radius of the circulating well and the characteristics of the low-permeability area, the low-concentration repairing agent is selected for multiple injection at the injection point close to the low-permeability area, and the high-concentration repairing agent is selected for one-time injection at the injection point far away from the low-permeability area, so that the repairing effect of the low-permeability area is improved, the using amount of the repairing agent is saved, and the repairing effect of the ground-permeability area is improved.
Preferably, the method further comprises: increasing the radius of influence of the remediation agent by increasing the flow rate of the pumped water of the circulation well, the radius of influence being centered on the circulation well. The greater the pumping water flow rate of the circulation well, the greater its influence radius. Compared with the defect that migration of the repairing agent is uncontrollable after the repairing agent is injected into the underground in the prior art, the method changes the influence radius of the repairing agent by changing the pumping water flow rate of the circulating well, so that the repairing range of the repairing agent is preliminarily controllable, and the influence radius of the repairing agent can be adjusted in a targeted manner according to the pollution degree of a polluted area.
Preferably, the method further comprises: at least one monitoring well is provided in a specific contaminated area, and soil is sampled from the monitoring well according to a preset repair period to monitor the concentration of contaminants.
Preferably, the method further comprises: and measuring the effluent of the circulating well according to a preset period to monitor the pollutant removal efficiency.
According to the invention, the repair condition of the polluted area and the removal efficiency of pollutants are monitored by regular monitoring, so that the problem of difficult pollutant treatment in the low-permeability area is effectively solved, the repair period is reasonable, the repair cost is reduced, and the repair process of the polluted site is accelerated.
The invention also provides a device for strengthening the migration of the repairing agent in the low-permeability area, which at least comprises a circulating well and a first injection assembly, wherein the circulating well capable of completing water pumping and injection in the same well is arranged in a range close to the low-permeability area; providing at least one injection assembly at a location proximate to the low permeability zone; injecting a low-concentration repairing agent into the injection assembly, and injecting a catalyst into the circulating well; under the hydraulic excitation of the circulation well, water output by the circulation well applies a vertical and/or inclined downward driving force to the low-permeability area, so that the repairing agent is strengthened to vertically migrate and permeate into the low-permeability area.
Drawings
FIG. 1 is a simplified schematic illustration of one of the angles of flask simulation of the operation of a tank and circulation well;
FIG. 2 is a simplified schematic diagram of another angle of flask simulation of the operation of a tank and circulation well;
FIG. 3 is a schematic diagram of a simulated water flow field line under a circulating well drive;
FIG. 4 is a graph of hydrogen peroxide concentration profile without circulating well actuation;
FIG. 5 is a graph of hydrogen peroxide concentration profile under 10rpm circulation well drive;
FIG. 6 is a graph showing a 5mM hydrogen peroxide concentration profile driven by a 10rpm circulation well;
FIG. 7 is a 20mM hydrogen peroxide concentration profile driven by a 10rpm circulation well;
FIG. 8 is a graph of hydrogen peroxide concentration profile under 10rpm circulation well drive;
FIG. 9 shows the sum of sampling points for the low permeability zone with or without circulating well actuationSchematic representation of hydrogen peroxide concentration variation;
FIG. 10 shows the sampling points (I) and (II) of the low permeability region during migration of hydrogen peroxide driven by a circulating well at different injection sitesA schematic representation of the change in hydrogen peroxide concentration.
List of reference numerals
1: a driving mechanism; 2: a circulation well; 3: a sand box; 21: a water pumping pipe; 22: a sealing plate; 23: a water injection pipe; 31: a groundwater input mechanism; 32: a groundwater outlet; 33: a sampling port; 34: and a groundwater inlet.
Detailed Description
The following detailed description refers to the accompanying drawings.
The invention provides a method for strengthening migration of a repairing agent in a low-permeability area based on a circulating well, and also provides a method for adjusting the influence range of the repairing agent in the low-permeability area.
In the present invention, the remediation agent is an oxidizing agent for use in an in situ chemical oxidation technique. Oxidizing agents include permanganate, persulfate, hydrogen peroxide, and ozone. The first three oxidants are typically injected in a liquid state, ozone being a strong oxidant.
In the present invention, the low permeability region is mainly composed of clay (illite, montmorillonite, etc.) and has a permeability coefficient of about 1×10 -6 ～9×10 -7 The m/s region has very low permeability due to the very limited pore flow rate and very poor water permeability.
In the simulation experiment, hydrogen peroxide is adopted as a repairing agent to carry out the simulation experiment so as to verify the technical effect of the technical scheme of the invention.
The invention is described in the aid of experimental simulation equipment capable of displaying the migration process of the repairing agent.
As shown in fig. 1, the experimental simulation apparatus of the present invention is shown in fig. 1 and 2.
The experimental simulation equipment at least comprises a circulating well 2 and a sand box 3. The circulation well 2 is provided in the flask 3 in such a manner as to pump water longitudinally. The circulation well 2 is connected with the driving mechanism 1, so that the driving mechanism 1 can realize pumping and injecting of water in the circulation well 2.
The circulating well 2 in the invention has the same structure as a real circulating well, is a reduced circulating well, and can realize the circulation of underground water by the circulating well. The driving mechanism 1 is a pump and provides driving force for pumping water for the circulating well. The circulation well 2 includes at least a water suction pipe 21, a water injection pipe 23, and a baffle plate 22. The baffle 22 seals the well into upper and lower sections. The bottom of the well body is provided with a plurality of sieve pores, and groundwater is allowed to enter the well body through the sieve pores. The pumping pipe penetrates the baffle plate 22 and pumps out the groundwater at the bottom of the well body, and is injected into the upper portion of the well body. The upper part of the well body is provided with a plurality of sieve holes communicated with the outside, and the injected water flows into the gravel from the sieve holes. The water flowing out of the mesh holes flows downward and in an inclined direction based on the action of gravity. Since the driving mechanism 1 drives the water suction pipe 21 to suck the groundwater and form negative pressure, the groundwater in the gravel gathers toward the bottom of the circulation well based on the negative pressure effect of the ground and reenters the bottom of the circulation well through the mesh holes at the bottom of the circulation well, forming circulation of the groundwater flow.
The sand box 3 is a box body in which gravel is provided for simulating an underground environment. One side of the flask 3 is provided with a groundwater inlet 34. The simulated groundwater is input into the flask through the groundwater input mechanism 32 and the groundwater inlet 34 of the sand tank 3. The groundwater input 32 is preferably a water pump. The groundwater inlet 34 is located at a bottom position of one side of the flask 3.
The groundwater outlet 32 is located at the other side of the flask 3 near the top. I.e. the groundwater inlet 34 has a height difference from the groundwater outlet 32 and the groundwater inlet 34 is located at a lower level than the groundwater outlet 32. So arranged, the flow of simulated groundwater can form virtual groundwater in the flask 3, so as to observe the effect of the circulation well 2 on the circulation of groundwater and the effect of restoration.
Preferably, one side of the flask 3 is provided with a number of groundwater inlets 34. The other side of the flask 3 is provided with a number of groundwater outlets 32 to build up simulated groundwater for lateral migration at different height differences. The groundwater inlet 34 and groundwater outlet 32 are each provided with a sealing cover which is removed when needed and used to seal the port when not in use.
The flask 3 may be transparent or non-transparent. Preferably, the sand box 2 is arranged to be transparent, namely, the sand box made of transparent materials is selected, so that the water circulation process of the circulation well can be observed. Preferably, as can be seen from the top view of the flask shown in fig. 2, the two sides of the flask 3, which are not provided with the groundwater inlet and the groundwater outlet, are respectively provided with a plurality of sampling ports 33 for sampling the infiltration of the repair agent.
The top of the flask 3 is opened for injecting the restorative agent at positions at different distances from the circulation well.
Preferably, the sampling ports 33 are arranged in a different distance from the circulation well 2. For example, a plurality of sampling ports 33 are arranged laterally in a row. Preferably, the plurality of sampling ports 33 may be arranged in two or three rows having different heights. Preferably, the two rows of sampling ports 33 are also offset to allow sampling from different locations in the gravel.
Preferably, as shown in fig. 1, at least one low permeability material having a density different from that of gravel is provided in the flask 3 as a low permeability region 4 under the ground. The low permeability zone 4 is positioned in the vicinity of the circulation well 2 so that the circulation well can be clearly tested for permeability to the remediation agent of the low permeability zone.
Preferably, in the experimental simulation apparatus, the distance between the low permeability zone 4 and the circulation well 2 is 0.16m to 0.35m.
In practical field applications, the circulation well is between 0 and 20m from the low permeability zone. Further preferably, the strengthening effect of the circulation well is relatively good when the distance between the circulation well and the low permeability zone is 3 to 10 m. Further, the circulating well carries out positive circulation at a medium flow rate, which is more beneficial to the strengthening and repairing of the low-permeability area. The medium flow rate of the circulation well is in the speed range of 1-3L/h.
It should be noted that the present invention provides for the circulation well to be positioned in a non-vertically above the low permeability zone to achieve an obliquely downward or vertically downward driving force applied by the circulation well driving water to the low permeability zone. In the prior art, the circulating well is arranged above the low-permeability area or is directly inserted into the low-permeability area, so that the structure of the low-permeability area can only be damaged, the water in the circulating well cannot apply a vertical downward driving force to the low-permeability area, and the repairing agent cannot be continuously and vertically moved downwards naturally.
The low permeability zone 4 is positioned to correspond to at least two sampling points, and sampling of the permeation of the healing agent at least two locations of the low permeability zone has been facilitated.
The present invention selects two injection points near the circulation well region (i.e., on the left and right sides of the circulation well) to inject 75mL of 10mM hydrogen peroxide solution, respectively. Groundwater input mechanism 31 simulates groundwater flow speed at a speed of 0.046 m/d. The drive mechanism 1 was operated at 10rpm (34.7 mL/min) as the pumping water flow rate for the circulation well 2. In the simulation experiment, the hydrogen peroxide migration process was reflected by concentration measurement of 32 sampling points at 3 rd, 6 th, 9 th and 12h after the start of the experiment, respectively.
As shown in fig. 3 and 9, in the case of not starting the circulation well, hydrogen peroxide is accumulated above the low permeation area 4 due to the blocking effect of the low permeation area, and the hydrogen peroxide is partially moved out of the concentration accumulation area due to the water flow effect, so that the water flow effect is proved to be a main influence factor of the lateral migration of the hydrogen peroxide, and the vertical migration is influenced by the gravity effect of the water flow. The low permeation area 4 does not detect the hydrogen peroxide concentration during the four time periods because the low permeation area has a large difference in permeability compared to the surrounding area, and hydrogen peroxide is difficult to enter the low permeation area by only the flow of water and natural downward permeation of the oxidizing agent itself.
Difficulties with in situ chemical repair in the current state of the art for low permeability zone applications include: firstly, the repairing agent cannot permeate into the low-permeability area, so that the treatment of the polluted low-permeability area becomes a great difficulty in site repair; secondly, the vertical migration of the repairing agent is greatly limited due to the action of groundwater flow and self gravity, and the repairing agent is taken away by water flow when the repairing agent does not reach the middle and lower layers of the stratum, so that the influence range of the repairing agent is limited.
In order to solve the defects in the prior art, the invention also provides a device for strengthening the migration of the repairing agent in the low-permeability area, which at least comprises a circulating well and a first injection assembly. The first injection assembly is for injecting a low concentration of a healing agent into the low permeability zone and its vicinity.
Circulation wells capable of completing pumping and injecting water in the same well are arranged in a range close to the low-permeability area. At least one first injection assembly is disposed proximate the low permeability zone. The injection assembly is injected with a low concentration of a healing agent. And (3) injecting catalyst into the circulating well. Under the hydraulic excitation of the circulation well, water output by the circulation well applies a vertical and/or inclined downward driving force to the low-permeability area, so that the repairing agent is strengthened to vertically migrate and permeate into the low-permeability area.
The means for enhancing migration of the healing agent in the low permeability region further comprises a second injection assembly. The second injection assembly is used for injecting the high-concentration repairing agent into the DNAPL site.
Preferably, the first injection assembly is distributed around the low permeability zone. The first injection assembly can be divided into a plurality of groups of locations for injection of the repair agent.
Preferably, the plurality of first injection assemblies can be distributed at different distances centered on the low permeability region. For example, the first set of first injection assemblies is located a distance L1 from the center location of the low permeability zone and the concentration of injected repair agent is C1. The second set of first injection assemblies is located a distance L2 from the center of the low permeability zone and the concentration of injected healing agent is C2. Under the condition that L1 is smaller than L2, C1 is less than or equal to C2. By analogy, the N-th group of first injection assemblies is located a distance LN from the central location of the low permeability zone, and the concentration of injected healing agent is CN. When L (N-1) is smaller than LN, C (N-1) is less than or equal to CN.
An apparatus for enhancing migration of a healing agent in a low permeability zone can be used to implement a method for enhancing migration of a healing agent in a low permeability zone. The method at least comprises the following steps:
s1: a circulating well capable of pumping and injecting water in the same well is arranged in a range close to the low-permeability area;
s2: determining a low permeability zone and positioning at least one injection point at a location proximate the low permeability zone;
s3: injecting a repairing agent into the injection point, and injecting a catalyst into the circulating well;
s4: under the hydraulic excitation of the circulation well, water output by the circulation well applies a vertical and/or inclined downward driving force to the low-permeability area, so that the repairing agent is strengthened to vertically migrate and permeate into the low-permeability area.
Preferably, the location proximate the low permeability zone includes a region vertically above the permeability zone and a region between the low permeability zone and the circulation well location.
As shown in fig. 4, the hydraulic excitation of the circulation well 2 increases the vertical component force, so that hydrogen peroxide can effectively permeate into the low permeation area 4. As shown in fig. 6-8, the hydrogen peroxide in the low permeability zone 4 can be maintained at a higher concentration as the circulation well continues to run. The entire flask was filled with hydrogen peroxide after 6 hours, driven by the circulation well at a pump-water flow rate of 10rpm, as shown in fig. 4. Under the hydraulic excitation action of the circulating well, the vertical migration of hydrogen peroxide is effectively improved. As the run time continues, the hydraulic power near the circulation well region is stronger than the hydraulic power far from the circulation well region due to the higher circulation times, so that the hydrogen peroxide is diluted multiple times, and the concentration around the circulation well 2 is obviously lower than the concentration far from the circulation well region.
Preferably, the osmotic effect of the healing agent at different concentrations on the low permeability zone 4 is different. The repair effect of the low permeability region can be enhanced by selecting a proper concentration of the repair agent.
The present invention selects two injection points near the circulation well region (i.e., on the left and right sides of the circulation well) to inject 75mM, 5mM/20mM hydrogen peroxide solution, respectively. The groundwater input mechanism simulates groundwater flow speed at 0.046m/d, with 10rpm (34.7 mL/min) as circulating well pumping water flow speed. The water flow rate here is the normal flow rate of the ground water simulated manually. The invention reflects the migration process of hydrogen peroxide by measuring the concentration of 32 sampling points in the 3 rd, the 6 th, the 9 th and the 12 th hours after the circulation well operates.
In the case of circulation well enhanced migration of hydrogen peroxide at a concentration of 5mM, as shown in FIGS. 5 and 10, the right side region of circulation well 2 has a more pronounced pumping process, indicating that the right side region is more affected by circulation well pumping water, while the left side region is primarily where hydrogen peroxide accumulates in the low permeability region.
In the case of enhancing the migration of hydrogen peroxide at a concentration of 20mM for the circulation well, as shown in FIG. 6, there is a clear pumping curve on the left side of the circulation well 2 at 6 h. The higher the concentration, the more detrimental the healing agent aggregation in the low permeability zone 4. During migration of the healer for up to 3 hours, hydrogen peroxide at a concentration of 20mM was distributed throughout the flask, indicating that higher hydrogen peroxide concentrations are more beneficial for vertical migration efficiency in non-low permeability areas.
The circulation well strengthens the different migration effects of hydrogen peroxide at different concentrations, and it can be demonstrated that high concentrations of hydrogen peroxide facilitate their own vertical migration. The higher the concentration of hydrogen peroxide is, the more unfavorable it is for its aggregation in the low permeability zone, so the site of the actual low permeability zone can take into account multiple injections of low concentration to ensure higher concentration aggregation in the low permeability zone.
Aiming at the permeation characteristic and the vertical migration characteristic of the concentration of the repairing agent to the low-permeation area, the invention injects the repairing agent with low concentration into the low-permeation area and injects the repairing agent with high concentration into the non-low-permeation area.
Preferably, the low concentration healing agent is injected from the injection point in a multiple injection fashion. The concentration range of the low-concentration repairing agent is 1-10 mmol/L.
In the case where the repair field is a DNAPL field, a high concentration repair agent is injected into the injection point. The DNAPL site refers to a non-aqueous liquid with a density greater than that of water, and because of its own gravity, the DNAPL site is focused on treating the underlying contaminants as a repair point.
Under the hydraulic excitation action of the circulating well, water output by the circulating well applies a vertical and/or inclined downward driving force to the DNAPL site, so that the high-concentration repairing agent effectively migrates vertically. The concentration range of the high-concentration repairing agent is 10-20 mmol/L.
In the invention, the inside of the low-permeability area is less influenced by the hydraulic excitation of the circulating well, and the concentration of the repairing agent in the low-permeability area can be maintained for a longer repairing time. The range of longer repair time that can be achieved by the present invention is 9 hours or more.
For example, the present invention has also simulated the effect of enhancing hydrogen peroxide delivery to a circulation well at different injection points.
To reflect the effect of different injection sites on circulation well enhanced hydrogen peroxide delivery, circulation well drive tests were performed: hydrogen peroxide solutions with concentrations of 75mM and 10mM were injected over the low permeability zone and at symmetrical sites, respectively, with a simulated groundwater flow speed of 0.046m/d and a circulating well pumping water flow speed of 10rpm (34.7 mL/min). The hydrogen peroxide migration process was reflected by concentration measurements at 32 sampling points at 3, 6, 9, 12h, respectively.
The effect of hydrogen oxide on circulation well enhanced hydrogen peroxide transport for different injection sites, as shown in fig. 3, can effectively penetrate into the low permeability zone. As shown in fig. 6, the circulation well hydraulic excitation has a leftward and downward force component, and the accumulated hydrogen peroxide in the low permeability zone can be maintained for a long period of time as the circulation well is continuously operated. The hydrogen peroxide in the low permeability zone can be maintained for a period of time in the range of 9 hours or more. Wherein, the first 6 hours of permeation are mainly transported from the high permeation area to the low permeation area, the last six hours are mainly decomposed by clay in the low permeation area, the decay rate is increased along with the increase of the hydrogen peroxide concentration, the low-concentration hydrogen peroxide is only attenuated by 5% in the process of the last six hours, and the high-concentration hydrogen peroxide is only attenuated by 10% in the last six hours, so that the low permeation area can maintain the migration of hydrogen peroxide for a long time.
Compared with the mode of continuously or frequently injecting the repairing agent in the prior art, the method has the advantages that the relative position control between the circulating well and the low-permeability area is improved, the injection position of the repairing agent is changed, so that the low-permeability area has the concentration accumulation effect of the repairing agent, and the repairing agent does not need to be injected frequently under the condition that the repairing agent can be maintained for a long time (more than 9 hours) in the low-permeability area, so that the using amount of the repairing agent is saved, the injection workload of the repairing agent is reduced, and the operation flow of the repairing agent is simplified.
In the present invention, the injection of hydrogen peroxide over the low permeation zone can enhance the aggregation of the low permeation zone, and as shown in fig. 6, a higher hydrogen peroxide concentration can be detected by the injection method over the low permeation zone at four times.
In the invention, the closer the injection point of the injected repairing agent is to the low-permeability area, the more obvious the circulating well acts on the reinforced repairing agent in the low-permeability area.
Preferably, the present invention can enhance the repair effect of the low-permeability region and DNAPL site by injecting the repair agent of different concentrations based on the above-described influence of the injection concentration and injection point position of the repair agent typified by hydrogen peroxide on the migration effect of the repair agent in the low-permeability region.
The concentration of the healing agent injected at the injection point is positively correlated to the distance between the injection point and the low permeability region. In the trend of the distance between the injection point and the low permeability region becoming smaller, the concentration of the healing agent injected at the injection point tends to become lower, so that the healing agent is more likely to aggregate in the low permeability region and enhance the healing effect.
For example, the closer the injection point is to the low permeability region, the lower the concentration of injected healing agent can be relative. The farther the injection point is from the low permeability zone, the higher the concentration of injected healing agent can be relatively with distance.
For example, there are three injection points from the horizontal distance of the far to near low permeability zone. The concentration of the three injection points becomes lower stepwise as the distance from the middle of the low permeability region becomes smaller.
By the arrangement, the low-concentration repairing agent can be better vertically migrated to the low-permeability area under the hydraulic excitation action of the circulating well, and the high-concentration repairing agent in the DNAPL site can also be vertically migrated based on self gravity.
In the invention, the influence radius of the repairing agent is increased by increasing the flow rate of the pumped water of the circulating well, and the influence radius is centered on the circulating well. The flow rate of the pumped water of the circulation well increases, and the influence radius thereof also becomes relatively large. Therefore, by improving the flow rate of the pumped water of the circulating well and the vertical migration distance of the repairing agent, the influence radius of the repairing agent can be relatively enlarged, and the repairing effect of the repairing agent on the polluted area is further improved.
Preferably, the present invention provides for at least one monitoring well in a specific contaminated area. Soil is sampled from the monitoring well in accordance with a predetermined remediation cycle to monitor the concentration of contaminants, thereby ensuring the effectiveness of in situ chemical oxidation remediation.
Preferably, in the present invention, the effluent of the circulation well is measured at preset periods to monitor the removal efficiency of contaminants.
In summary, the method of coupling the circulating well technology and the in-situ chemical oxidation technology can strengthen the penetration of the oxidant into the low-permeability area and keep the low-permeability area for a long time without adding polymer, and improve the contact possibility of the oxidant and pollutants in the low-permeability area. Under the hydraulic excitation action of the circulation well, the vertical migration distance of the oxidant is increased, and the influence range of the oxidant in the stratum is enlarged. Therefore, the optimization method of the invention at least comprises the following steps according to the actual site situation: first, for efficient repair of low permeability zones, selecting injection points closer to the low permeability zone; second, high concentration hydrogen peroxide is beneficial to vertical migration of the hydrogen peroxide, and injection of high concentration oxidant can be considered for DNAL site repair; third, the higher the concentration, the more detrimental it is to its aggregation in the low permeability zone, so the actual site may take into account multiple injections of low concentration oxidant to ensure higher concentration aggregation in the low permeability zone.
It should be noted that the above-described embodiments are exemplary, and that a person skilled in the art, in light of the present disclosure, may devise various solutions that fall within the scope of the present disclosure and fall within the scope of the present disclosure. It should be understood by those skilled in the art that the present description and drawings are illustrative and not limiting to the claims. The scope of the invention is defined by the claims and their equivalents. The description of the invention encompasses multiple inventive concepts, such as "preferably," "according to a preferred embodiment," or "optionally," all means that the corresponding paragraph discloses a separate concept, and that the applicant reserves the right to filed a divisional application according to each inventive concept.
Claims (9)
1. A method for enhanced remediation of a zone of low permeability based on circulating wells, the method comprising at least:
a circulating well capable of pumping and injecting water in the same well is arranged in a range close to the low-permeability area;
determining a low permeability zone and disposing at least one injection point at a location proximate to the low permeability zone, the location proximate to the low permeability zone comprising a vertically upper region of the low permeability zone and a region between the low permeability zone and the circulation well location;
injecting a repairing agent into the injection point, and injecting a catalyst into the circulating well;
in the event of a circulating well water shock to increase the vertical component, water output by the circulating well applies a vertical and/or inclined downward driving force to the low permeability zone such that the remediation agent is enhanced to migrate vertically and penetrate into the low permeability zone.
2. The method of circulating-well-based enhanced repair agent migration in a low permeability zone of claim 1, further comprising:
injecting a low-concentration repairing agent from the injection point in a multi-injection mode;
the concentration range of the low-concentration repairing agent is 1-10 mmol/L.
3. The method of circulating well strengthening remediation agent-based migration in a low permeability zone of claim 1 or claim 2, further comprising:
in the case where the repair field is a DNAPL field, a high concentration repair agent is injected into the injection point,
under the hydraulic excitation action of a circulating well, applying a vertical and/or inclined downward driving force to the DNAPL site by water output by the circulating well, so that the high-concentration repairing agent effectively migrates vertically;
the concentration range of the high-concentration repairing agent is 10-20 mmol/L.
4. The method for circulating well strengthening the migration of a remediation agent in a low permeability zone of claim 1,
the inside of the low-permeability area is less influenced by the hydraulic excitation of the circulating well, and the concentration of the repairing agent in the low-permeability area can be maintained for a longer repairing time;
the longer repair time ranges are: not less than 9 hours.
5. The method for circulating well strengthening the migration of a remediation agent in a low permeability zone of claim 2,
the concentration of the healing agent injected at the injection point is positively correlated to the distance between the injection point and the low permeability region, wherein,
in the case where the distance between the injection point and the low permeability region tends to be small, the concentration of the repair agent injected at the injection point tends to be low.
6. The method of circulating-well-based enhanced repair agent migration in a low permeability zone of claim 1, further comprising:
the radius of influence of the remediation agent is increased by increasing the flow rate of the pumped water of the circulation well,
the radius of influence is centered on the circulation well.
7. The method of circulating-well-based enhanced repair agent migration in a low permeability zone of claim 6, further comprising:
at least one monitoring well is arranged in a specific pollution area,
soil is sampled from the monitoring well in accordance with a predetermined remediation cycle to monitor the concentration of contaminants.
8. The method of circulating-well-based enhanced repair agent migration in a low permeability zone of claim 7, further comprising:
and measuring the effluent of the circulating well according to a preset period to monitor the pollutant removal efficiency.
9. An apparatus for enhancing the migration of a remediation agent in a low permeability zone comprising at least a circulation well and a first injection assembly,
the circulating well capable of completing water pumping and injecting in the same well is arranged in a range close to the low-permeability area;
providing at least one injection assembly at a location proximate to the low permeability zone, the location proximate to the low permeability zone comprising a vertically upper zone of the low permeability zone and a zone between the low permeability zone and the circulation well location;
injecting a low-concentration repairing agent into the injection assembly, and injecting a catalyst into the circulating well;
in the event of a circulating well water shock to increase the vertical component, water output by the circulating well applies a vertical and/or inclined downward driving force to the low permeability zone such that the remediation agent is enhanced to migrate vertically and penetrate into the low permeability zone.
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| CN115724498B (en) * | 2022-11-25 | 2024-03-19 | 吉林大学 | Underground pollution restoration device and method |
| CN116177637A (en) * | 2023-02-20 | 2023-05-30 | 长安大学 | Repairing system and method for ultrasonic-assisted reinforced underground water circulating well |
| CN116351858A (en) * | 2023-04-11 | 2023-06-30 | 河南地矿集团中昊建设工程有限公司 | Combined control method for contaminated site soil and underground water |
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