CN213012005U - In-situ injection device for strengthening groundwater pollution remediation - Google Patents
In-situ injection device for strengthening groundwater pollution remediation Download PDFInfo
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- CN213012005U CN213012005U CN202021133058.0U CN202021133058U CN213012005U CN 213012005 U CN213012005 U CN 213012005U CN 202021133058 U CN202021133058 U CN 202021133058U CN 213012005 U CN213012005 U CN 213012005U
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Abstract
The utility model discloses a reinforce prosthetic normal position injection device of groundwater pollution belongs to groundwater pollution repair technical field. The device comprises a medicament delivery unit and a multi-unit in situ well group; the multi-unit in-situ well group comprises at least 1 pumping well and a plurality of injection wells; the plurality of injection wells are distributed around the pumping well; the distance between the pumping well and the injection well and the distance between every two injection wells are the well spacing; the well spacing satisfies the following conditions: v1 XT > well spacing > V2 XT; a pumping part is arranged in the pumping well and can pump the underground water in the well; the water outlet of the water pumping part is connected with the water inlet of the water delivery pipeline; the water outlet of the water pipeline is communicated with the wellhead of the injection well; the drug delivery unit comprises a drug delivery pipeline, and drug outlets of the drug delivery pipeline are respectively communicated with well heads of the injection wells; the drug delivery pipeline is provided with an electromagnetic valve which can control the drug delivery pipeline to open and close. The utility model discloses can effectively strengthen groundwater pollution remediation.
Description
Technical Field
The utility model belongs to the technical field of groundwater pollution remediation, concretely relates to reinforce prosthetic normal position injection device of groundwater pollution.
Background
The groundwater remediation refers to a process of adopting a physical, chemical or biological method to restore and strengthen the main functions of a water body environment system and partially or completely restore the water body to the original state on the basis of utilizing the self-adaption, self-organization and self-regulation functions of an aquatic ecosystem after diving or confined water buried underground is polluted or the structure of the ecosystem is damaged.
According to the data published by the Chinese geological environment monitoring institute, the pollution of underground water in China is developing from point to surface, from shallow to deep, from cities to rural areas, and the pollution condition of the underground water is continuously aggravated. When the nation carries out groundwater investigation and assessment, special attention is paid to important pollution sources such as mine mining areas, hazardous waste disposal sites, refuse landfills, gas stations, oil exploitation and processing, nonferrous metal processing, chemical enterprises and the like, and the pollution of the industries to groundwater is found to be very common.
In the in-situ remediation technology, the microorganism remediation technology, the chemical oxidation technology, the chemical reduction technology and the like all need to inject a remediation medicament into underground water, and the migration of solutes in the underground water is influenced by different hydrogeological permeability coefficients, so that the research and development of an efficient medicament injection method is a key for reducing the remediation cost and shortening the remediation period.
SUMMERY OF THE UTILITY MODEL
Based on the objective demand that exists in the field, the utility model provides a reinforce prosthetic normal position injection device of groundwater pollution, make full use of groundwater dynamics method solves the problem that well spacing, medicament migration speed and porous medium pollution in coordination are restoreed in the groundwater.
In order to solve the technical problem, the utility model discloses a following technical scheme:
an in-situ injection device for strengthening groundwater pollution remediation is characterized by comprising a medicament conveying unit and a multi-unit in-situ well group;
the multi-unit in-situ well group comprises at least 1 pumping well and a plurality of injection wells;
the plurality of injection wells are distributed around the pumping well;
the distance between the pumping well and the injection well and the distance between every two injection wells are the well spacing;
the well spacing satisfies the following conditions: v1 XT > well spacing > V2 XT;
wherein V1 is the average underground water migration speed under the condition of water pumping, V2 is the average underground water migration speed, and T is the strong effective time of the medicament in water;
the strong effective time of the agent in water refers to the time required for the concentration of the agent to decay by 80% in water;
a pumping part is arranged in the pumping well and can pump the underground water in the well; the water outlet of the water pumping part is connected with the water inlet of the water delivery pipeline; the water outlet of the water pipeline is communicated with the wellhead of the injection well;
the drug delivery unit comprises a drug delivery pipeline, and drug outlets of the drug delivery pipeline are respectively communicated with well heads of the injection wells; the drug delivery pipeline is provided with an electromagnetic valve which can control the drug delivery pipeline to open and close.
The injection wells are distributed around the pumping well as the circle center;
preferably, each multi-unit in situ well group has 3 injection wells,
preferably, 3 injection wells of one multi-unit in-situ well group a and 3 injection wells of another 3 adjacent multi-unit in-situ well groups form a regular hexagon centered on the pumping well of the multi-unit in-situ well group a;
preferably, a liquid level meter is arranged in the pumping well, the liquid level meter is connected with a liquid level display instrument through a line, and the liquid level display instrument is respectively connected with the pumping part and the electromagnetic valve on the medicine delivery pipeline through the line;
more preferably, the liquid level display is internally provided with a controller, and the controller is respectively connected with the water pumping part and the electromagnetic valve on the medicine conveying pipeline through lines.
Further, the liquid level meter is a drop-in type liquid level meter;
the built-in controller of the liquid level display instrument comprises a liquid level value data receiving module, a water pumping part starting triggering module, a water pumping part closing triggering module, an electromagnetic valve starting triggering module and an electromagnetic valve closing triggering module; the level value data receiving module is respectively connected with the water pumping part starting triggering module, the water pumping part closing triggering module, the electromagnetic valve starting triggering module and the electromagnetic valve closing triggering module through lines;
preferably, the trigger thresholds of the water pumping part starting trigger module and the electromagnetic valve closing trigger module are level values H1, and the trigger thresholds of the water pumping part closing trigger module and the electromagnetic valve starting trigger module are level values H2;
more preferably, the depth of the diving surface is-0.1 meter < the liquid level value H1 < the depth of the diving surface is-1 meter,
the depth of the water pumping part is more than 0.1 m and less than the liquid level value H2 and more than the depth of the water pumping part is more than 1 m,
preferably, the level value H1 is-0.5 m deep of the diving plane;
the liquid level value H2 is equal to the setting depth of the water pumping component plus 0.5 m;
preferably, the water outlet of the water delivery pipeline and the medicine outlet of the medicine delivery pipeline are the same outlet.
Further, the drug delivery unit further comprises a drug buffer tank and a drug delivery pump; the drug outlet of the drug buffer groove is connected with the inlet of the drug delivery pipeline, and the drug delivery pump is arranged at the downstream position of the drug buffer groove close to the drug outlet of the drug buffer groove and provides power for drug output;
preferably, a check valve for preventing pumped groundwater from flowing into the medicament buffer groove is arranged on the medicament delivery pipeline connected with the medicament outlet of the medicament buffer groove.
Preferably, each injection well is provided with a conical distribution disc;
preferably, the conical distribution plate is arranged at a position 1 meter above the diving surface to 1 meter below the wellhead; the water pumping part in the water pumping well is a deep well pump;
preferably, a valve is arranged on a medicine conveying pipeline connected with each injection well at a position close to a wellhead, and a flow meter is arranged on the upstream of the valve;
preferably, a check valve for preventing the medicament from flowing into the pumping well is arranged on the water conveying pipeline connected with the pumping well at a position close to the mouth of the pumping well.
Furthermore, a monitoring sampling port is arranged at the upstream position of a check valve close to the mouth of the pumping well;
preferably, the in-situ injection device for enhancing groundwater pollution remediation comprises a plurality of multi-unit in-situ well groups.
The in-situ injection process for strengthening groundwater pollution remediation is characterized in that the in-situ injection device for strengthening groundwater pollution remediation is used for remedying the underground area to be remediated.
An in-situ injection process for enhancing groundwater pollution remediation, comprising:
s1, determining the well spacing according to the measured average migration velocity V2 of underground water, the average migration velocity V1 of underground water under the water pumping condition and the strong effective time T of a medicament in water;
s2, constructing a multi-unit in-situ well group in the underground of the area to be repaired according to the determined well arrangement distance;
s3, the liquid level meter detects that the liquid level of the pumping well is higher than H2, detection data are fed back to the liquid level display instrument, and the controller controls the pumping part to be started; the liquid level meter detects that the liquid level of the pumping well is lower than H1 and feeds detection data back to the liquid level display instrument, and the controller controls the pumping part to stop and controls the solenoid valve to open.
S2 further includes: after a multi-unit in-situ well group is constructed, connecting the well mouth of each injection well with a water pumping part of a water pumping well by adopting a water conveying pipeline; and a medicament buffer tank of the medicament conveying unit is connected with the wellhead of each injection well by a medicament conveying pipeline.
Preferably, the chemicals are added into the chemical buffer tank once every other week, and the step S3 is repeated until the groundwater meets the groundwater quality standard GBT-14848-.
An in-situ injection method for strengthening groundwater pollution remediation comprises a plurality of unit in-situ injection processes, contaminated site well arrangement, interval determination and injection methods.
The in-situ injection process includes the steps of injecting the extract water and the medicament through the on-off of electromagnetic valves of a high-level and low-level automatic control deep well pump and a medicament injection pipeline (medicament delivery pipeline) in a pumping well, injecting water or the medicament into an injection well group (three wells or four wells) at intervals, injecting the extract water and the medicament into an injection well to share the same pipeline, arranging a flowmeter and an adjusting valve on each injection well pipeline, and adjusting the injection flow to be stable at a high level.
The unit in-situ injection process comprises the steps that a check valve arranged at the outlet of a deep well pump in a pumping well and a check valve arranged on a repair agent injection pipe (a drug delivery pipeline) can only inject water or agents into an injection well group (a three-well or four-well), the agents are prevented from flowing back to a pumping well or a drug main pipe, and a monitoring sampling port is arranged in front of the check valve of the pumping well and used for monitoring and sampling.
The in-situ injection process comprises the step of arranging a conical distribution disc at the upper part in an injection well, wherein injected medicaments and injected water slowly flow in along the well wall, so that mutual disturbance between the injected medicaments and the water is avoided.
The well arrangement mode and the interval determination comprise that the well arrangement mode adopts hexagonal well arrangement, the center of a hexagon is a pumping well, six corners are injection wells, and the injection wells are all in the range of a pumping well underground water descending funnel.
The well arrangement mode and the interval determination comprise that the average migration speed of underground water determined by a tracing test and the radius of influence of strong effectiveness of the medicament under the average migration speed of underground water in a pumping state are simultaneously met and the radius of influence of the maximum radius R of the pumping well is determined on site.
Determining the formation time of the underground water falling funnel according to the average migration speed of the underground water in the water pumping state, continuously pumping water and injecting the water into the injection well, adjusting the injection flow and keeping the highest water level of the injection well stable.
After groundwater descending funnel formed, start medicament buffer slot export medicament delivery pump, turn into automatic control, when the pumping well water level dropped to low level H2, the deep-well pump stopped, opened medicament pipeline solenoid valve, injected the medicament into the well of injecting. When the water level of the pumping well rises to the high water level H1, the electromagnetic valve is closed, and the deep-well pump is started to inject water into the injection well.
The medicament and water injected into the well flow towards the direction of the pumping well in a conical hydraulic gradient and pass through porous medium gap channels formed by the underground water falling funnel at intervals, so that the migration speed of the underground water and the medicament is improved, and the reaction speed of the medicament with polluted underground water and water-containing media is accelerated.
After the single repair agent injection process is finished, water pumping and injection are stopped, the underground water flow field of the polluted site is automatically repaired for a period of time, and the contact reaction time of the agent and the underground water is prolonged. All the repairing processes are carried out once every other week until the repairing target is reached.
The utility model relates to a reinforce groundwater pollution remediation's normal position injection method, including a plurality of unit normal position injection processes, pollution site well arrangement and interval confirm, injection method. The in-situ injection process and method for each unit comprise the steps of automatically controlling the opening and closing of a deep well pump and an agent injection pipeline (drug delivery pipeline) electromagnetic valve through the high and low water levels in a pumping well during the injection of pumping water and agents, injecting water or agents into an injection well group (three wells or four wells) at intervals, and improving the migration speed of the agents through a porous medium gap formed by an underground water falling funnel of the pumping well and a conical hydraulic gradient of an injection well. The well arrangement mode and the well arrangement intervals adopt hexagonal well arrangement including the well arrangement mode, the centers of hexagons are pumping wells, six corners are injection wells, and the well arrangement intervals are in the strong effective influence range of the traditional Chinese medicine agent in the underground water and the underground water falling funnel range of the pumping wells.
An in-situ injection method for strengthening groundwater pollution remediation comprises a plurality of unit in-situ injection processes, contaminated site well arrangement, interval determination and injection methods.
Furthermore, the unit in-situ injection process comprises the steps of injecting the extract water and the medicament into an injection well group (three wells or four wells) alternately and automatically, injecting the extract water and the repairing medicament into the injection well by using the same pipeline, and arranging a flowmeter and an adjusting valve on each injection well pipeline.
Further, set up the deep-well pump in the pumped well, the export sets up the check valve, sets up the monitoring sample connection before the pumped well check valve for the monitoring sample. The repair agent injection pipe (drug delivery line) is provided with an electromagnetic valve and a check valve, and the extraction line check valve and the repair agent line check valve are connected to the injection well through a multi-way pipe.
Furthermore, a conical distribution disc is arranged at the upper part in the injection well, and the injection well and the pumping well are both composed of solid pipes and sieve pipes and are in conventional configuration.
Furthermore, the polluted site well arrangement adopts a hexagonal well arrangement mode, a water pumping well is arranged in the center of the hexagon, and water injection wells are arranged at six corners of the hexagon.
Further, the determination of the well spacing comprises the steps of measuring the average migration speed of underground water and the average migration speed of underground water in a pumping state by a tracing test, measuring the strong effective time of the repairing agent in the water by a test, and measuring the maximum influence radius of the pumping well on site.
Furthermore, the well spacing interval should satisfy the product value of the average migration speed of underground water, the average migration speed of underground water in a pumping state and the strong effective time of the repairing agent in underground water, and is smaller than the maximum influence radius R for pumping water.
Further, the injection method determines the formation time of the underground water falling funnel according to the average underground water migration speed in the water pumping state, pumps water continuously and injects the pumped water into the injection well, adjusts the injection flow and keeps the highest water level of the injection well stable.
Further, after the groundwater descending funnel forms, start the export medicament delivery pump of medicament dashpot, turn into the automatic control procedure, when the pumping well water level dropped to low level H2, the deep-well pump stopped, opened medicament pipeline solenoid valve, injected the medicament into the injection well. When the water level of the pumping well rises to the high water level H1, the electromagnetic valve is closed, and the deep-well pump is started to inject water into the injection well.
Furthermore, the conical distribution plate in the injection well can enable the injected medicament and the injected water to slowly flow in along the well wall, so that mutual disturbance between the injected medicament and the water is avoided.
Furthermore, a porous medium gap channel formed between the medicament and the water through the underground water funnel is in contact reaction with the polluted water and the water-containing medium, and flows towards the direction of the pumping well in a conical hydraulic power mode.
The porous medium gap channel refers to a pore between the underground sand pebbles, after water is pumped for a period of time, the water level in the well is reduced, water in the pore is changed into an anhydrous pore after flowing out, and no water is in the sand pebbles, so that the medicament is injected again, and the medicament easily enters the gap to become a medicament channel.
Furthermore, after the single repairing agent injection process is finished, water pumping and injection are stopped, and underground water in the polluted site is automatically repaired for a period of time.
Further, the whole repairing process is carried out once every other week until the repairing target is reached.
Every other week means: the medicament is added into the medicament buffer groove once every other week, then the automatic control is started, and a plurality of cycles of water pumping, water filling and medicament injection can be carried out within one week until the medicament in the medicament buffer groove is completely released.
Determining the total amount of required chemicals according to the total amount of pollutants in the total amount of polluted underground water, and then determining the amount of chemicals to be injected every week according to the dosing times required by design.
The total amount of the pollutants in the total amount of the groundwater can be measured by conventional exploration and detection methods in the field, for example, the measuring and calculating method recorded in the research on the combined control and application of surface water and the total amount of the groundwater pollutants can be referred to. The total amount of the medicament added each time can be determined according to the total amount of underground water pollutants in the area to be repaired measured by the method and the pollutant repair standard recorded in the underground water quality standard GBT-14848-2017.
The dosage of the medicament added into the medicament buffer slot is generally consumed after 10 to 50 times of water pumping-water injection-medicament injection circulation (namely S3 steps).
The in-situ injection method for strengthening groundwater pollution remediation is characterized by comprising the following steps:
and (4) experimentally constructing a pumping well and an injection well on a polluted site, and measuring the maximum pumping quantity. And (4) measuring the average migration speed of the underground water and the average migration speed of the underground water in a pumping state by a tracing test.
The strong effective time of the remediation agent in water was determined in the laboratory.
And calculating the moving influence radius of the medicament according to the product of the average migration speed of the underground water and the strong effective time of the medicament in the water, and comprehensively determining the well spacing by referring to the maximum influence radius R of the pumping well.
In the field pollution range, the pumping wells and the injection wells are constructed in a hexagonal well arrangement mode.
And (3) piping each hexagonal unit pumping well and each hexagonal unit injection well group (three wells or four wells) according to a process, and connecting each hexagonal unit medicament branch pipe with the medicament main pipe, the medicament pump and the medicament buffer tank.
And starting each water pumping well deep well pump, starting the medicament pump after the underground water falling funnel is formed, converting the medicament pump into automatic control, stopping pumping water and medicament injection after the single medicament injection process is automatically finished, and automatically repairing the underground water in the polluted site for a period of time.
And repeating the repairing process every other week until the repairing target is reached.
Compared with the prior art, the utility model has the advantages of:
the utility model discloses a characteristics lie in that the scope of influence according to the medicament accurately sets up the cloth well interval, cloth well mode and interval confirm including satisfy simultaneously that the tracer test survey's groundwater average migration speed and the state of drawing water under the ground the strong validity of medicament influence radius and spot survey suction well most influence within the radius R under the ground water average migration speed.
The utility model is characterized in that the injection process of the medicament is automatically completed. The liquid level meter in the pumping well is communicated with the ground liquid level display instrument through a line, and a deep well pump and an electromagnetic valve on a medicine conveying pipeline in the pumping well are controlled through the line.
The utility model discloses a liquid level display appearance and input level gauge can commercially be obtained, and specific brand model is 4-20mA, YZ 1201.
The utility model discloses a characteristics still lie in groundwater pumping and injection circulation, form groundwater descending funnel and medium space, strengthen the restoration of groundwater and aqueous medium, owing to formed groundwater descending funnel, the water in the descending funnel has been emptied promptly (the position above the dot-dash line in figure 4), medicament and porous medium direct contact reaction, this is exactly the contact opportunity between them that has strengthened, after the groundwater evacuation, the space between the sand cobble just vacates, and the sand cobble surface has adsorbed the pollutant, this medicament can be restoreed the pollutant on this surface, in addition, medicament and groundwater are poured into in turn, because the hydrodynamic force dispersion mechanism of medicament appearance matter, can be in the groundwater diffusion, at this moment medicament and water flow through the dynamic circulation that the pumping well formed groundwater from these spaces. This is enhanced because the chemicals can only restore groundwater if these voids are not formed, but the contaminants adsorbed by the sand and pebbles are not contacted with the chemicals or the reaction speed of the contacted chemicals is slow, because the movement of groundwater is laminar flow movement and the edge water contacting the surface of the sand and pebbles has zero speed, and the contaminants on the surface of the sand and pebbles can only be contacted by molecular diffusion of the chemicals. Furthermore, the water resistance decreases and the flow increases after the gaps have emerged.
Drawings
Fig. 1 is a plan layout view of a drug delivery unit and a multi-unit in-situ well group of an in-situ injection apparatus for enhanced groundwater contamination remediation according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a set of multi-unit in-situ injection wells and pumping wells according to another embodiment of the present invention;
fig. 3 is a plan view of a set of multi-unit in-situ injection wells and pumping wells according to an embodiment of the present invention;
fig. 4 is a vertical flow field diagram of a group of multi-unit in-situ injection wells and pumping wells according to another embodiment of the present invention.
The labels in the figure are listed below: 1-injection well, 2-injection well, 3-injection well, 4-injection well, 5-injection well, 6-injection well, 7-pumping well, 8-solenoid valve, 9-medicament delivery pump, 10-medicament buffer tank, 11-deep well pump, 12-check valve, 13-check valve, 14-flowmeter, 15-valve, 16-toper distribution plate.
Detailed Description
The invention will be further described with reference to the drawings and specific preferred embodiments without limiting the scope of the invention.
Example 1
The present invention will be described in further detail with reference to examples.
Taking in-situ chemical oxidation remediation of organic matter polluted underground water in a place as an example, according to an early stage water pumping test, the maximum influence radius is calculated to be 245 m, the average migration speed of the underground water measured by a tracing test is 3.5 m/day, the average migration speed of the underground water measured under a water pumping condition is 31 m/day, the strong effective time of the agent in the water measured by the test is at least 3 days, and the in-situ chemical oxidation influence radius is calculated to be 10.5-93 m. Comprehensively considering the factors of treatment effect, construction period and cost, setting the radius of influence of in-situ chemical oxidation to be 20 meters, and determining the well spacing to be 20 meters.
The maximum influence radius R is larger than the product X1 of the underground water average migration speed V1 and the strong effective time T of the medicament in water under the water pumping condition, and is larger than the product X2 of the underground water average migration speed V2 and the strong effective time T of the medicament in water, X2 is smaller than the in-situ chemical oxidation influence radius and is smaller than X1, the well spacing is selected according to the in-situ chemical oxidation influence radius, in practice, the well spacing can be set according to the underground water parameters of a polluted site and the actual construction period, any well spacing is within the numerical range of the in-situ chemical oxidation influence radius, the repairing effect is not influenced, and the number of the well spacing is required to be adjusted from the aspects of construction cost and construction period.
The average underground water migration velocity V1 and the average underground water migration velocity V2 under the condition of pumping water are respectively obtained by testing according to a tracer test, the method for measuring the underground water flow velocity by using the tracer test is a conventional technical means in the field, and the person skilled in the art can measure the underground water migration velocity according to the tracer method described in the summary of the quantitative tracer research methods of karst underground rivers, the article of the literature of the research article of karst underground rivers and the cited references thereof, or the following steps are carried out for measurement:
1. tracer agent: a sodium chloride tracer (suitable for tracer tests in a small range of tens of meters to one or two hundred meters) is used. The tracing distance is designed to be 50-150 meters, the adding amount of the salt is set to be 20-30 Kg according to experience, and the preparation concentration is determined according to the solubility of underground water at the actual temperature.
2. And (3) tracer detection: the electric conductivity is measured by a DDS-11A type electric conductivity meter and an electric heating constant temperature water temperature box is arranged. Sampling each well, storing the well sample in a 25 ℃ constant temperature water bath box, measuring the conductivity at 25 ℃, and recording the numerical value according to the well number, the sampling time and the conductivity.
3. And (4) measuring the maximum water injection speed of the single well and determining the injection speed of the tracer. The method adopts a medicament preparation and injection integrated device for measurement.
4. Preparing a sodium chloride tracer by adopting a medicament preparation and injection integrated device, adding the tracer into an injection well, and measuring the conductivity at intervals of 4 hours in a monitoring well; drawing a conductivity-time curve according to the measured conductivity, determining the average diffusion speed of the tracer in the underground water according to the characteristics of wave crests, wave troughs, trailing phenomena and the like of the conductivity-time curve, analyzing the conditions of the underground water pipeline, and the like, and providing design parameters for the design of well spacing and medicament injection modes under different hydrogeological conditions (one of a uniform permeation field, a concentrated permeation field, a parallel double-channel field and an underground water pool is selected for research).
5. And (4) measuring the maximum pumping quantity and the water level depression of the single well in the pumping well, calculating the maximum influence radius of the pumping well, and meanwhile, repeating the content of the tracing test in the step (4) under the pumping state.
The well spacing refers to the straight line distance between each injection well 1, 3 and 4 and the pumping well in the multi-unit in-situ well group A in figure 2
The utility model discloses a polycell normal position well crowd, as shown in figure 1, in a certain well crowd A, there are 1 pumped well and 3 injection wells, 3 different injection wells in 3 adjacent other 3 well crowds form regular hexagon with 3 injection wells in the well crowd A, in the actual engineering of building up, often when building up last well crowd, the injection well that can appear in this well crowd has 4 situations, 2 injection wells with 2 adjacent well crowds of this well crowd form regular hexagon, it is shown as the 1 st well crowd of 3 rows left-hand play in figure 1.
According to the well arrangement mode shown in the figure 1, in the same multi-unit in-situ well group, 2 adjacent injection wells and pumping wells are in equilateral triangles, the well spacing is 20 meters, the injection wells and the pumping wells are constructed in the range of a pollution site, the well depths of the injection wells and the pumping wells are greater than the depths of underground water pollution plumes, and the pipes are arranged and connected with the agent buffer grooves according to the process design requirements.
The chemical adopts sodium persulfate as an oxidant and sodium hydroxide as an activator, the dosage of the sodium persulfate and the sodium hydroxide in the chemical formula are respectively 1.5% and 0.03% of the total amount of underground water, and the chemical which is injected once is prepared and then stored in a chemical buffer tank.
The deep well pump 11 in each unit pumping well in the polluted site is started to inject water into the injection well 1, 3 and 4, the valve 15 is adjusted, the flow of the flow meter is controlled, the water level in the injection well is stable at a high position, water is continuously pumped for about 15 hours, when an underground water falling funnel is formed, in terms of figure 2, water in the middle pumping well 7 is pumped out, the injection wells 134 around 7 are injected inwards, and an underground water level pattern that the water level in the middle 7 is low and the water level in the periphery 134 is high is formed, namely the underground water falling funnel. The radius R of the precipitation funnel is larger than the distance between wells.
Starting a medicament delivery pump 9 at the outlet of a medicament buffer tank 10, converting a manual switch and an automatic switch on a control box into automatic control, wherein an automatic control line is connected with a control panel of a liquid level display instrument, the control panel of the liquid level display instrument is connected with a control line of a deep well pump in a pumping well, and the control panel of the liquid level display instrument is connected with an electromagnetic valve on a medicament pipeline, when the liquid level in the pumping well 7 reaches a set high level H1, automatically starting the deep well pump 11 through the control line of the liquid level display instrument, pushing the pumped water to open a check valve 12, entering injection wells 1, 3 and 4 through flowmeters 14 and valves 15 on the injection wells 1, 3 and 4, slowly flowing the water into the injection wells along the well wall through a conical distribution disc 16 in the well, injecting underground water porous media into the distribution water head with a flow field as a dotted line in a diagram 4, and flowing towards the pumping well, and injecting water of adjacent, 5. 6.
In the multi-unit in-situ well group A, when the liquid level in the pumping well 7 is lowered to a low level H2, the liquid level display instrument control circuit automatically closes the deep well pump 11, opens the electromagnetic valve 8, the medicament pushes the check valve 13 open, enters the injection wells 1, 3 and 4 through the flow meters 14 and the valves 15 on the injection wells 1, 3 and 4, slowly flows into the injection wells along the well wall through the conical distribution disc 16 in the well, injects a porous medium into the underground water by taking the flow field as the water head distribution of the dotted line in the figure 4, and flows towards the pumping well, and injects the medicaments into the respective injection wells 2, 5 and 6 after 3 other adjacent multi-unit in-situ well groups pass through links of water pumping, water injection and the like. The multi-unit in-situ well groups are not communicated with each other.
The flow fields are formed by water heads of different positions of underground water, such as the flow fields indicated by dotted lines in fig. 4, underground water falling funnels are formed between central pumping wells and surrounding injection wells in the same multi-unit in-situ well group after pumping water, and the formed inverted cone-shaped water level distribution is lower than that of the in-situ underground water head.
The level H1 is set at a level 0.1-1 m below the submergence surface, preferably 0.5 m below the submergence surface, and the level H2 is set at a level 0.1-1 m above the deep well pump, preferably 0.5 m above the deep well pump.
After the single-time medicament injection work is finished, the water pumping and the injection are stopped, so that the underground water of the polluted site is automatically restored for a period of time.
And injecting the medicament once every other week until the restoration is completely finished, thereby achieving the restoration target.
Claims (22)
1. An in-situ injection device for enhancing groundwater pollution remediation, the device comprising a medicament delivery unit and a multi-unit in-situ well group;
the multi-unit in-situ well group comprises at least 1 pumping well and a plurality of injection wells;
the plurality of injection wells are distributed around the pumping well;
the distance between the pumping well and the injection well and the distance between every two injection wells are the well spacing;
the well spacing satisfies the following conditions: v1 XT > well spacing > V2 XT;
wherein V1 is the average underground water migration speed under the condition of water pumping, V2 is the average underground water migration speed, and T is the strong effective time of the medicament in water;
the strong effective time of the agent in water refers to the time required for the concentration of the agent to decay by 80% in water;
a pumping part is arranged in the pumping well and can pump the underground water in the well; the water outlet of the water pumping part is connected with the water inlet of the water delivery pipeline; the water outlet of the water pipeline is communicated with the wellhead of the injection well;
the drug delivery unit comprises a drug delivery pipeline, and drug outlets of the drug delivery pipeline are respectively communicated with well heads of the injection wells; the drug delivery pipeline is provided with an electromagnetic valve capable of controlling the drug delivery pipeline to open and close;
the water pumping well is internally provided with a liquid level meter which is connected with a liquid level display instrument through a line, and the liquid level display instrument is respectively connected with the water pumping part and the electromagnetic valve on the medicine conveying pipeline through the line.
2. An in-situ injection apparatus for enhancing remediation of groundwater pollution as claimed in claim 1, wherein the plurality of injection wells are distributed around the pumping well as a center of a circle.
3. An in situ injection apparatus for enhanced remediation of groundwater contamination according to claim 1, wherein there are 3 injection wells per multi-unit in situ well group.
4. An in-situ injection apparatus for enhanced remediation of groundwater pollution as claimed in claim 1, wherein 3 injection wells of one multi-unit in-situ well group a form a regular hexagon centered around the pumping well of the multi-unit in-situ well group a with 3 injection wells of another 3 adjacent multi-unit in-situ well groups.
5. The in-situ injection device for strengthening groundwater pollution remediation of claim 1, wherein the liquid level display instrument is internally provided with a controller, and the controller is respectively connected with the water pumping part and the electromagnetic valve on the drug delivery pipeline through lines.
6. The in-situ injection apparatus for enhancing remediation of groundwater pollution as claimed in claim 1, wherein the level gauge is a drop-in level gauge.
7. The in-situ injection device for strengthening groundwater pollution remediation according to claim 1, wherein the built-in controller of the liquid level display instrument comprises a level value data receiving module, a pumping part starting triggering module, a pumping part closing triggering module, an electromagnetic valve starting triggering module and an electromagnetic valve closing triggering module; and the liquid level value data receiving module is respectively connected with the water pumping part starting triggering module, the water pumping part closing triggering module, the electromagnetic valve starting triggering module and the electromagnetic valve closing triggering module through lines.
8. The in-situ injection device for strengthening groundwater pollution remediation according to claim 5, wherein the built-in controller of the liquid level display instrument comprises a level value data receiving module, a pumping part starting triggering module, a pumping part closing triggering module, an electromagnetic valve starting triggering module and an electromagnetic valve closing triggering module; and the liquid level value data receiving module is respectively connected with the water pumping part starting triggering module, the water pumping part closing triggering module, the electromagnetic valve starting triggering module and the electromagnetic valve closing triggering module through lines.
9. The in-situ injection device for enhancing groundwater pollution remediation of claim 7, wherein the built-in controller of the liquid level display instrument is a PLC controller.
10. The in-situ injection device for enhancing groundwater pollution remediation of claim 8, wherein the built-in controller of the liquid level display instrument is a PLC controller.
11. The in-situ injection device for enhancing groundwater pollution remediation according to claim 7 or 8, wherein the trigger threshold of the pumping part starting trigger module and the solenoid valve closing trigger module is a level value H1, and the trigger threshold of the pumping part closing trigger module and the solenoid valve starting trigger module is a level value H2.
12. The in situ injection apparatus for enhanced remediation of groundwater contamination of claim 11, wherein the submergence depth-0.1 meter < level value H1 < submergence depth-1 meter,
the depth of the water pumping part is more than 0.1 m and less than the liquid level value H2 and more than the depth of the water pumping part is more than 1 m.
13. The in situ injection apparatus for enhanced remediation of groundwater contamination of claim 12, wherein the level value H1 is-0.5 m deep from the submergence surface;
the liquid level value H2 is equal to the setting depth of the water pumping component plus 0.5 m.
14. The in-situ injection device for enhancing groundwater pollution remediation as claimed in claim 1, wherein the water outlet of the water delivery pipeline and the drug outlet of the drug delivery pipeline are the same outlet.
15. The in-situ injection apparatus for enhancing groundwater contamination remediation of claim 1, wherein the agent delivery unit further comprises an agent buffer tank and an agent delivery pump; the medicine outlet of the medicine buffer groove is connected with the inlet of the medicine conveying pipeline, and the medicine conveying pump is arranged at the downstream position of the medicine buffer groove close to the medicine outlet of the medicine buffer groove and provides power for medicine output.
16. The in-situ injection apparatus for enhancing groundwater contamination remediation as claimed in claim 15, wherein a check valve for preventing pumped groundwater from flowing into the chemical buffer tank is provided on the drug delivery pipe connected to the drug outlet of the chemical buffer tank.
17. An in situ injection apparatus for enhanced remediation of groundwater contamination according to any of claims 1 to 4, wherein a conical distribution plate is provided in each injection well.
18. The in situ injection apparatus for enhanced remediation of groundwater contamination of claim 17, wherein the conical distribution plate is positioned from 1 meter above the submergence surface to 1 meter below the wellhead; and the water pumping part in the water pumping well is a deep well pump.
19. An in-situ injection apparatus for enhanced remediation of groundwater pollution as claimed in claim 1 or claim 5, wherein the delivery lines associated with each injection well are provided with valves at a location near the wellhead and with flow meters upstream of the valves.
20. The in-situ injection device for enhancing groundwater pollution remediation as claimed in claim 1, wherein a check valve for preventing the agent from flowing into the pumping well is disposed on the water delivery pipeline connected to the pumping well at a position close to the wellhead of the pumping well.
21. An in situ injection apparatus for enhanced remediation of groundwater contamination according to any of claims 1 to 10 and 14 to 16, wherein the monitoring sampling port is located upstream of a check valve near the wellhead of the pumping well.
22. An in-situ injection apparatus for enhanced groundwater contamination remediation according to any one of claims 1 to 4, wherein the in-situ injection apparatus for enhanced groundwater contamination remediation comprises a plurality of multi-unit in-situ well groups.
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| CN113651397A (en) * | 2021-08-26 | 2021-11-16 | 南华大学 | Simulation device and simulation method for uranium-polluted underground water remediation and uranium recovery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113651397A (en) * | 2021-08-26 | 2021-11-16 | 南华大学 | Simulation device and simulation method for uranium-polluted underground water remediation and uranium recovery |
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