CN111744943B - Large-diameter medicament injection well and in-situ remediation equipment and process for organic matter polluted groundwater - Google Patents
Large-diameter medicament injection well and in-situ remediation equipment and process for organic matter polluted groundwater Download PDFInfo
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- CN111744943B CN111744943B CN202010560897.9A CN202010560897A CN111744943B CN 111744943 B CN111744943 B CN 111744943B CN 202010560897 A CN202010560897 A CN 202010560897A CN 111744943 B CN111744943 B CN 111744943B
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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
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention discloses a large-diameter medicament injection well and in-situ remediation equipment and a process for organic matter polluted underground water, and belongs to the technical field of underground water in-situ remediation. The caliber of the large-caliber medicament injection well is 500 mm-1000 mm. The organic matter pollutes groundwater normal position remediation equipment includes: a large-caliber medicament injection well and a medicament preparation and conveying device; the medicament preparing and conveying device comprises a medicament preparing groove and a medicament conveying pipeline; the bottom opening of the agent preparation groove is communicated with the agent inlet of the agent conveying pipeline, and the agent outlet of the agent conveying pipeline can directly extend into the well mouth of the large-caliber agent injection well. The invention adopts the large-caliber medicament injection well, which can effectively increase the contact area of the injected medicament with the polluted soil and the underground water, accelerate the medicament injection speed and improve the repair efficiency. Meanwhile, the extraction wells are arranged at certain intervals, so that the repair effect is further improved.
Description
Technical Field
The invention belongs to the technical field of underground water in-situ remediation, and particularly relates to a large-diameter medicament injection well, and organic matter polluted underground water in-situ remediation equipment and process thereof.
Background
The current state of the technology for remedying the organic polluted groundwater at home and abroad at present:
with the acceleration of the global industrialization process, a plurality of sites polluted by organic matters appear, and the soil and underground water are polluted to different degrees. Since the 80 s in the 20 th century, research and engineering practices related to control and remediation of underground water pollution sites have been developed in developed countries such as the United states, the Netherlands and the like, and a large amount of research achievements and engineering experiences are accumulated aiming at underground water pollution control and remediation technologies. Common underground water pollution control and remediation technologies mainly comprise a pumping treatment technology, an in-situ chemical oxidation/reduction technology, an in-situ bioremediation technology, a permeable reactive barrier technology, an in-situ phytoremediation technology, a natural attenuation monitoring technology and the like. According to statistics of 787 groundwater-containing remediation sites in 1982-1999 in the super fund sites in the United states, more than 95% of sites adopt 3 most commonly used technologies of extraction treatment, in-situ treatment and natural attenuation monitoring.
The in-situ chemical oxidation technology is to inject strong oxidant directly into the soil and underground water in the polluted area to promote the organic pollutant in the soil and underground water to decompose into non-toxic or low-toxic small molecular substance, so that the pollutant can be removed, thereby achieving the aim of remediation. Common chemical oxidants include chlorine dioxide, Fenton's reagent, hydrogen peroxide, hypochlorite, persulfate, potassium permanganate, ozone, and the like.
In situ chemical oxidation techniques are typically used to treat refractory contaminants. For example, a service station in los angeles, usa, used in situ chemical oxidation to remediate gasoline contaminated soil and groundwater, using Fenton reagent as the oxidant, showed that most of BTEX (benzene, toluene, ethylbenzene, and xylene) and total petroleum hydrocarbons were effectively removed, with removal rates of 96% and 93%, respectively.
The in-situ chemical oxidation technique is only applicable to pores, fractures and karst aquifers with better permeability.
In view of the fact that the currently commonly adopted small-caliber medicament injection wells are all small-caliber medicament injection wells, the medicament injection is pressurized and injected by adopting a pneumatic diaphragm pump, and the injection and repair efficiency is very limited, the field needs to develop a medicament injection well with a brand new structure.
Disclosure of Invention
The invention aims to provide a large-caliber medicament injection well aiming at the defects and the requirements of the prior art in the field, the medicament injection is self-flowing injection, the injection well is simple in structure and easy to implement, and the injection efficiency of the oxidizing medicament can be effectively improved by increasing the contact area of the oxidizing medicament with polluted soil and underground water; meanwhile, an extraction well is additionally arranged below the underground water flow field for vacuum extraction, so that the permeation rate of the injected medicament in the soil layer of the polluted area is accelerated, and the injected medicament is rapidly contacted and reacted with polluted underground water, so that the polluted underground water is repaired.
The technical scheme of the invention is as follows:
a large-caliber medicament injection well is characterized in that the caliber of the injection well is 500 mm-1000 mm.
The large-caliber medicament injection well comprises a closed section of a medicament injection well pipe and an open section of the medicament injection well pipe; the well wall of the medicament injection well pipe sealing section is sealed; a plurality of through holes are distributed on the well wall of the open hole section of the medicament injection well pipe; the top wellhead of the large-caliber medicament injection well is 1m-7m underground, and the position of 7m is preferably a medicament injection well pipe closed section; the underground open hole section 7m-12m, preferably 7m, of the large-caliber medicament injection well is an open hole section of a medicament injection well pipe from the bottom of the well;
preferably, the agent injection well casing open hole section height is 3m-8m, preferably 5 m.
The large-caliber medicament injection well further comprises a vacuum extraction well pipe; the vacuum extraction well pipe comprises a closed section of the vacuum extraction well pipe and an open section of the vacuum extraction well pipe; the pipe wall of the closed section of the vacuum extraction well pipe is closed, and a plurality of through holes are distributed on the pipe wall of the open section of the vacuum extraction well pipe;
preferably, the aperture size of the through hole is phi 30 mm-phi 50 mm.
An organic matter polluted groundwater in-situ remediation device, comprising: the large-caliber medicament injection well is characterized by comprising a large-caliber medicament injection well.
The organic matter polluted groundwater in-situ remediation equipment further comprises: a medicament dispensing and delivery device;
the medicament preparing and conveying device comprises a medicament preparing groove and a medicament conveying pipeline; the bottom opening of the medicament preparation groove is communicated with a medicament inlet of the medicament delivery pipeline,
preferably, the agent outlet of the agent delivery conduit may extend directly into the wellhead of the large bore agent injection well.
Preferably, a stirring part is arranged in the medicament preparation tank; an electric feeding valve and a medicament flow meter are arranged at the upstream position of a medicament outlet of the medicament conveying pipeline; the adding of the medicament is controlled by an electric valve and is metered by a flowmeter;
preferably, the agent preparation groove comprises an oxidizing agent preparation groove and a catalytic agent preparation groove which are respectively arranged on two sides of the large-caliber agent injection well; an oxidizing agent conveying pipeline connected with the bottom of the oxidizing agent preparation tank and a catalytic agent conveying pipeline connected with the bottom of the catalytic agent preparation tank respectively extend into the well mouth from two sides of the large-caliber agent injection well.
The organic matter polluted groundwater in-situ remediation equipment further comprises: a vacuum extraction system and a tail gas treatment system;
the vacuum extraction system comprises a small-caliber vacuum extraction well, a vacuum extraction gas-liquid separator and a water ring vacuum pump;
the wellhead of the small-caliber vacuum extraction well is hermetically connected with the inlet of the gas pipeline; the outlet of the gas pipeline is hermetically connected with the gas inlet on the side wall of the vacuum extraction gas-liquid separator; the vacuum extraction gas-liquid separator can be connected with a water ring vacuum pump through an extraction pipeline; the bottom of the vacuum extraction gas-liquid separator is provided with a liquid outlet;
preferably, a liquid outlet at the bottom of the vacuum extraction gas-liquid separator extends into the liquid level in the large-caliber medicament injection well through a liquid conveying pipeline and forms a liquid seal;
preferably, the well spacing between the large-caliber agent injection well and the vacuum extraction well of the vacuum extraction system satisfies the following conditions:
v1 XT > well spacing > V2 XT;
wherein V1 is the average underground water migration velocity under the vacuum extraction condition, V2 is the average underground water migration velocity, 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;
preferably, the small-caliber vacuum extraction well comprises a closed section of a vacuum extraction well pipe and an open section of the vacuum extraction well pipe; closing the well wall of the closed section of the vacuum extraction well pipe; a plurality of through holes are distributed on the well wall of the open hole section of the vacuum extraction well pipe; the aperture size of the through hole is preferably phi 20 mm-phi 40 mm;
preferably, the position from the top wellhead of the small-caliber vacuum extraction well to the underground 1-7m (preferably 7m) is a closed section of a vacuum extraction well pipe; the underground 7-12m (preferably 7m) of the small-caliber vacuum extraction well is an open hole section of a vacuum extraction well pipe from the bottom of the well;
preferably, the tail gas treatment system comprises an activated carbon adsorption tower;
a gas inlet on the side wall of an activated carbon adsorption tower of the tail gas treatment system is communicated with a gas outlet on the top of a vacuum extraction gas-liquid separator of the vacuum extraction system through a gas pipeline, the activated carbon adsorption tower of the tail gas treatment system is connected with a water ring vacuum pump through an extraction pipeline, and a liquid outlet is arranged at the bottom of the activated carbon adsorption tower;
preferably, a liquid outlet at the bottom of the activated carbon adsorption tower extends into the position below the liquid level in the large-caliber medicament injection well through a liquid conveying pipeline and forms a liquid seal;
preferably, an activated carbon adsorption layer is arranged in the activated carbon adsorption tower.
The vacuum extraction system also comprises a vacuum buffer tank;
a gas inlet on the side wall of the vacuum buffer tank is communicated with a gas outlet on the top of an activated carbon adsorption tower of the tail gas treatment system through a gas pipeline; the top opening of the vacuum buffer tank is connected with a water ring vacuum pump through an extraction pipeline; the bottom of the vacuum buffer tank is provided with a liquid outlet;
preferably, a liquid outlet at the bottom of the vacuum buffer tank extends into the liquid level in the large-caliber medicament injection well through a liquid conveying pipeline and forms a liquid seal.
The in-situ remediation process of the organic matter polluted underground water is characterized in that the large-caliber medicament is injected into a well, and/or the in-situ remediation equipment of the organic matter polluted underground water is used for remedying the soil and the underground water in the underground area to be remediated.
The agent directly flows into the large-caliber agent injection well through an agent conveying pipeline inserted into the wellhead of the large-caliber agent injection well.
And starting a vacuum extraction system and a tail gas treatment system, extracting volatile gas of the organic pollutants generated underground after the treatment of the medicament to the ground for gas-liquid separation, and adsorbing the separated polluted gas by an activated carbon adsorption tower.
The core process of the invention is 'a technology of adopting a large-caliber medicament injection well + a technology of adopting an extraction well to carry out vacuum extraction + an extraction tail gas treatment'.
1. The core problem to be solved by adopting a large-caliber medicament injection well technology is to overcome the defects of low medicament injection speed, low injection efficiency, long groundwater remediation period and the like in the prior art; the process adopts a large-caliber medicament injection well technology, the diameter of a traditional medicament injection well is generally 150 mm-300 mm, the diameter of the adopted medicament injection well is 500 mm-1000 mm, and the contact area of the injected medicament with polluted soil and underground water can be effectively increased after the diameter of the injection well is increased, the medicament injection speed is accelerated, and the repair efficiency is improved. And a medicament injection well pipe is arranged in the injection well, and uniform medicament injection holes are formed in the lower part of the well pipe close to the underground water pollution layer to ensure the injection of the medicament. The qualified oxidizing agent and catalytic agent are directly added into the injection well pipe after being metered, and the height of the liquid level of the agent injected into the well is controlled by an automatic control device.
2. The extraction wells are arranged at certain intervals in the flow field direction of the underground water by depending on the downstream of the medicament injection well, and the vacuum pump is adopted for vacuum extraction, so that the seepage speed of the underground water can be accelerated, the repair time can be effectively shortened, the volatilization of organic pollutants in soil and underground water can be accelerated, the repair effect is further improved, and the moisture separated by the vacuum extraction system returns to the medicament injection well.
3. And (3) treating tail gas generated by vacuum extraction, carrying out gas-liquid separation on volatile organic gas generated by vacuum extraction through a gas-liquid separator, then, allowing the volatile organic gas to enter activated carbon adsorption equipment to adsorb organic pollutants, and finally, discharging the generated tail gas up to the standard.
Drawings
Fig. 1 is a schematic structural diagram and a schematic process flow diagram of a large-caliber medicament injection well and an in-situ remediation device for organic-polluted groundwater, provided by an embodiment of the invention.
The reference numbers are as follows: 1-oxidizing agent preparation tank, 2-oxidizing agent preparation tank stirring device, 3-oxidizing agent flowmeter, 4-large-caliber agent injection well, 5-agent injection well pipe closed section, 6-agent injection well pipe open hole section, 7-catalytic agent preparation tank, 8-catalytic agent preparation tank stirring device, 9-catalytic agent flowmeter, 10-small-caliber vacuum extraction well, 11-vacuum extraction well pipe closed section, 12-vacuum extraction well pipe open hole section, 13-vacuum extraction gas-liquid separator, 14-activated carbon adsorption tower, 15-activated carbon adsorption layer, 16-vacuum buffer tank, 17-water ring vacuum pump, 18-oxidizing agent electric charging valve, 19-catalytic agent electric charging valve.
Fig. 2 is a schematic diagram of a downhole configuration of a large-caliber agent injection well according to another embodiment of the invention. The reference numbers are as follows: 5-a closed section of a vacuum extraction well pipe, and 6-an open section of the vacuum extraction well pipe (the pipe wall is uniformly provided with medicament injection holes).
Fig. 3 is a schematic structural diagram of a large-caliber agent injection well according to an embodiment of the invention. The reference numbers are as follows: 5-a closed section of a medicament injection well pipe, 6-an open section of the medicament injection well pipe (medicament injection holes are uniformly distributed on the pipe wall), and 20-a moisture injection pipe (liquid conveying pipeline) separated by a vacuum extraction system.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples, but the scope of the present invention is not limited thereto.
Group 1 example, heavy-calibre agent injection well of the invention
The present set of embodiments provide a large bore agent injection well. In all the embodiments of the present group, the large-diameter injection well has a common feature that the diameter of the large-diameter injection well is 500mm to 1000mm, preferably 800 mm.
In a further embodiment, as shown in fig. 1,2 and 3, the large-caliber agent injection well 4 comprises an agent injection well closed section 5 and an agent injection well open section 6; the well wall of the medicament injection well pipe sealing section 5 is sealed; a plurality of through holes are distributed on the well wall of the open hole section 6 of the medicament injection well pipe; the position from the top wellhead of the large-caliber medicament injection well 4 to the underground 1-7m, preferably 7m, is a medicament injection well pipe closed section 5; 7-12m, preferably 7m, underground of the large-diameter medicament injection well 4 is an open hole section 6 of a medicament injection well pipe from the bottom of the well;
in a preferred embodiment, the agent injection well tubular open bore section 6 has a height of 3m to 8m, preferably 5 m.
Preferably, the aperture size of the through hole is phi 50 mm.
The embodiment of this group provides an organic matter pollutes groundwater normal position repair equipment, its characterized in that includes: a large bore injection well as provided in any of the embodiments of group 1.
In a further embodiment, the in-situ remediation equipment for organic contaminated groundwater further comprises: a medicament dispensing and delivery device;
as shown in fig. 1, the drug preparing and delivering device comprises a drug preparing groove and a drug delivering pipeline; the bottom opening of the medicament preparation groove is communicated with a medicament inlet of the medicament conveying pipeline;
preferably, the agent outlet of the agent delivery conduit may extend directly into the wellhead of the large bore agent injection well 4.
Preferably, a stirring part is arranged in the medicament preparation tank; electric charging valves 18 and 19 and medicament flow meters 3 and 9 are arranged at the upstream position of a medicament outlet of the medicament delivery pipeline; the adding of the medicament is controlled by an electric valve and is metered by a flowmeter;
preferably, the agent preparation tank comprises an oxidizing agent preparation tank 1 and a catalytic agent preparation tank 7 which are respectively arranged on two sides of the large-caliber agent injection well 4; an oxidizing agent conveying pipeline connected with the bottom of the oxidizing agent preparation groove 1 and a catalytic agent conveying pipeline connected with the bottom of the catalytic agent preparation groove 7 respectively extend into the well mouth from two sides of the large-caliber agent injection well 4.
The catalytic agent is used for improving the activity and the oxidation durability of the oxidation agent, and can be added with the oxidation agent at the same time or after the oxidation agent is added.
In a further embodiment, the in-situ remediation equipment for organic-contaminated groundwater further comprises: a vacuum extraction system and a tail gas treatment system;
compared with the prior art that the vacuum extraction mainly aims at extracting the underground water in the polluted soil to the ground for treatment or extracting the organic volatile matters in the polluted soil and the underground water for treatment, the vacuum extraction aims at forming a negative pressure in the vacuum extraction well to ensure that the underground water in the polluted soil forms a certain hydraulic gradient, the permeation speed of an oxidizing agent in the soil is accelerated, and the remediation efficiency is effectively improved; and the tail gas treatment system is used for treating volatile organic compounds generated in the vacuum extraction process so as to discharge the volatile organic compounds after the volatile organic compounds are qualified.
As shown in fig. 1, the vacuum extraction system comprises a small-caliber vacuum extraction well 10, a vacuum extraction gas-liquid separator 13 and a water-ring vacuum pump 17;
the wellhead of the small-caliber vacuum extraction well 10 is hermetically connected with the inlet of a gas pipeline; the outlet of the gas pipeline is hermetically connected with the gas inlet on the side wall of the vacuum extraction gas-liquid separator 13; the vacuum extraction gas-liquid separator 13 can be connected with a water ring vacuum pump 17 through an extraction pipeline; the bottom of the vacuum extraction gas-liquid separator 13 is provided with a liquid outlet;
preferably, a liquid outlet at the bottom of the vacuum extraction gas-liquid separator 13 extends into the liquid level in the large-caliber medicament injection well 4 through a liquid conveying pipeline and forms a liquid seal.
Preferably, the spacing between the injection well 4 of the large-caliber medicament and the vacuum extraction well 10 of the vacuum extraction system is generally 10m to 50m, preferably 18 m; the well spacing is dependent on the permeability of the groundwater remediation site soil.
Preferably, the small-caliber vacuum extraction well 10 comprises a vacuum extraction well pipe closed section 11 and a vacuum extraction well pipe open hole section 12; the well wall of the vacuum extraction well pipe sealing section 11 is sealed; a plurality of through holes are distributed on the well wall of the open hole section 12 of the vacuum extraction well pipe; the aperture size of the through hole is preferably phi 20 mm-phi 40 mm;
preferably, the position from the top wellhead of the small-caliber vacuum extraction well 10 to the underground 0m to 7m (preferably 7m) is a vacuum extraction well pipe closed section 11; the underground 7m to 12m (preferably 5m) of the small-caliber vacuum extraction well 10 is an open hole section 12 of a vacuum extraction well pipe from the bottom of the well;
preferably, the tail gas treatment system comprises an activated carbon adsorption tower 14;
a gas inlet on the side wall of an activated carbon adsorption tower 14 of the tail gas treatment system is communicated with a gas outlet on the top of a vacuum extraction gas-liquid separator 13 of the vacuum extraction system through a gas pipeline, the activated carbon adsorption tower 14 of the tail gas treatment system is connected with a water ring vacuum pump 17 through an extraction pipeline, and the bottom of the activated carbon adsorption tower 14 is provided with a liquid outlet;
preferably, a liquid outlet at the bottom of the activated carbon adsorption tower 14 extends into the liquid level in the large-caliber medicament injection well 4 through a liquid conveying pipeline and forms a liquid seal.
Preferably, an activated carbon adsorption layer 15 is arranged in the activated carbon adsorption tower 14.
The activated carbon adsorption tower 14 adopted by the invention is independently designed and manufactured, and the activated carbon in the tower is uniformly distributed in a plurality of layers, so that the service life of the activated carbon can be effectively prolonged, the activated carbon is prevented from being broken, the system running resistance is reduced, and the gas flow rate is accelerated.
In a particular embodiment, the vacuum extraction system further includes a vacuum surge tank 16, which functions to ensure smooth operation of the system and to prevent vacuum instability.
A gas inlet on the side wall of the vacuum buffer tank 16 is communicated with a gas outlet on the top of an activated carbon adsorption tower 14 of the tail gas treatment system through a gas pipeline; the top opening of the vacuum buffer tank 16 is connected with a water ring vacuum pump 17 through an extraction pipeline; the bottom of the vacuum buffer tank 16 is provided with a liquid outlet;
preferably, the liquid outlet at the bottom of the vacuum buffer tank 16 extends into the liquid level in the large-caliber medicament injection well 4 through a liquid conveying pipeline and forms a liquid seal.
Group 3 example, in-situ remediation Process of organic contaminated groundwater
The group of embodiments provides an in-situ remediation process for organic-polluted underground water, which is characterized in that a large-caliber medicament injection well provided by any one of the group 1 embodiments and/or an in-situ remediation device for organic-polluted underground water provided by any one of the group 2 embodiments is used for remediating an underground area to be remediated.
In a particular embodiment, the agent flows directly into the large caliber agent injection well through an agent delivery conduit inserted at the wellhead of the large caliber agent injection well.
In other embodiments, the vacuum extraction system and the tail gas treatment system are started, the volatile gas of the organic pollutants generated underground after the treatment of the medicament is extracted to the ground for gas-liquid separation, and the separated polluted gas is adsorbed by the activated carbon adsorption tower.
Examples of experiments,
Taking in-situ remediation of organic-polluted groundwater in a certain place in the south, the thickness of the water-containing layer in the water-rich area of the area is larger and reaches 12m on average, the permeability of the groundwater is better, the average permeability coefficient is 12m/d, and the maximum water yield of a single well reaches 700m3The thickness of the aquifer of the medium water-rich area is generally 6m, the average permeability coefficient is 6m/d, and the maximum water yield of a single well reaches 110m3. According to the result of the pilot test, the maximum influence radius of the in-situ injected medicament is calculated to be 20m, factors such as repair cost, construction period and repair effect are comprehensively considered, the diameter of the medicament injection well is designed to be 0.8m, the well pipe depth of the medicament injection well is designed to be 12m, and the distance between the medicament injection well and the vacuum extraction well is designed to be 18 m. The well spacing between the agent injection well and the vacuum extraction well depends on the permeability of the soil in the groundwater remediation field, and the following conditions are specifically met:
v1 XT > well spacing > V2 XT;
wherein V1 is the average underground water migration velocity under the vacuum extraction condition, V2 is the average underground water migration velocity, 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;
for the soil horizon that the osmotic coefficient is great, the soil horizon that permeates water easily promptly, well interval can be some greatly, for the soil horizon that the osmotic coefficient is less, the soil horizon that is difficult to permeate water promptly, well interval can be some less, and specific value is confirmed through the lab scale test. Therefore, the well spacing L ═ 18m in this case is determined through experiments.
The small test adopts a tracer test method, the diffusion speed of the tracer in underground water is slow in a natural state, the average speed is 4.8m/d, the diffusion speed of the tracer in underground water is fast in a vacuum extraction state, the average speed reaches 18.0m/d, and the oxidation medicament adopted in the test can keep the activity in water for at least 3 days (namely the strong effective time of the medicament in water is 3 days), so that the influence radius of the in-situ chemical oxidation medicament is 4.8 multiplied by 3 to 14.4m in the natural state, and the influence radius of the in-situ chemical oxidation medicament is 18 multiplied by 3 to 54m in the vacuum extraction state. Therefore, the distance between the agent injection well and the vacuum extraction well is reasonable between 14.4m and 54 m.
The total injection amount of the oxidation agent and the catalytic agent is designed to be 600Kg (solid), and the volume of the oxidation agent and the catalytic agent is about 2.5m after the oxidation agent and the catalytic agent are prepared into a certain concentration3In the disposable injection well, the depth of the injection well pipe is H-12 m, and the height of the lower open hole section is H1The upper solid segment height is 7m, 5 m.
And (3) starting a water ring vacuum pump (17) for vacuum extraction, carrying out gas-liquid separation on gas generated by vacuum extraction through a gas-liquid separator (13), then introducing the gas into an activated carbon adsorption tower (14) for adsorbing volatile matters of organic pollutants in the gas, and finally discharging the generated tail gas up to the standard. The water produced by the vacuum extraction system is separated and returned to the agent injection well. The agent is injected into the well at 2.5m3The agent can completely permeate into the polluted soil and the underground water after 4 days. The drug feeding, vacuum extraction and tail gas treatment systems are simultaneously started, 4 days mean that 2.5m3 of a drug added once can permeate into the polluted soil and underground water within 4 days, 30 batches of drugs are added in the test, the repair time is about 120 days, and finally six main pollutants are all qualified through detection.
The following are comparisons of values before and after remediation of the six main pollutants of the project:
| number of pollutants | Name of contaminant | Content before repair (μ g/L) | Content after repair (μ g/L) |
| 1 | 1, 1-dichloroethane | 59000 | 520 |
| 2 | Chloroform | 27000 | 300 |
| 3 | Benzene and its derivatives | 18000 | 110 |
| 4 | Vinyl chloride | 11000 | 90 |
| 5 | 1, 2-dichloroethane | 920 | 120 |
| 6 | Trichloroethane | 650 | 60 |
Six main pollutants are injected with medicaments and extracted in vacuum for multiple times to completely achieve the expected repair target. Compared with the traditional repair process for the small-caliber medicament injection well, the repair process has the advantages that the construction period is shortened by about 50%, and meanwhile, the repair cost can be greatly reduced.
Claims (25)
1. An organic matter polluted groundwater in-situ remediation device, comprising: a large-caliber medicament injection well and a vacuum extraction system; the caliber of the large-caliber medicament injection well is 500 mm-1000 mm;
the vacuum extraction system comprises a small-caliber vacuum extraction well, a vacuum extraction gas-liquid separator and a water ring vacuum pump;
the well spacing between the large-caliber medicament injection well and the vacuum extraction well of the vacuum extraction system meets the following conditions:
v1 XT > well spacing > V2 XT;
wherein V1 is the average underground water migration velocity under the vacuum extraction condition, V2 is the average underground water migration velocity, 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 agent concentration to decay by 80% in water.
2. The in-situ remediation equipment for organic-contaminated groundwater according to claim 1, wherein the large-caliber agent injection well comprises an agent injection well pipe closed section and an agent injection well pipe open section; the well wall of the medicament injection well pipe sealing section is sealed; a plurality of through holes are distributed on the well wall of the open hole section of the medicament injection well pipe; the position from the top wellhead of the large-caliber medicament injection well to 1m-7m underground is a medicament injection well pipe closed section; and the position 7m-12m below the ground of the large-caliber medicament injection well is an open hole section of a medicament injection well pipe from the bottom of the well.
3. The in-situ remediation equipment for organic-polluted groundwater according to claim 2, wherein the position from the top wellhead of the large-diameter agent injection well to 7m underground is an agent injection well pipe closed section; and the position 7m underground of the large-caliber medicament injection well reaches the bottom of the well and is an open hole section of the medicament injection well pipe.
4. The in-situ remediation device for organic-contaminated groundwater according to claim 2 or 3, wherein the height of the open section of the injection well pipe is 3m to 8 m.
5. The in-situ remediation device for organic-contaminated groundwater according to claim 2 or 3, wherein the height of the open section of the injection well pipe is 5 m.
6. The in-situ remediation device for organic-contaminated groundwater according to claim 1, wherein the small-caliber vacuum extraction well further comprises a vacuum extraction well pipe; the vacuum extraction well pipe comprises a closed section of the vacuum extraction well pipe and an open section of the vacuum extraction well pipe; the pipe wall of the closed section of the vacuum extraction well pipe is closed, and a plurality of through holes are distributed on the pipe wall of the open section of the vacuum extraction well pipe.
7. The in-situ remediation device of organic-contaminated groundwater according to claim 6, wherein the aperture size of the through hole is phi 30mm to phi 50 mm.
8. The in-situ remediation device of organic-contaminated groundwater according to claim 1, further comprising: a medicament dispensing and delivery device;
the medicament preparing and conveying device comprises a medicament preparing groove and a medicament conveying pipeline; the bottom opening of the medicament preparation groove is communicated with a medicament inlet of the medicament delivery pipeline.
9. The in-situ remediation equipment for organic-contaminated groundwater according to claim 8, wherein the agent outlet of the agent delivery conduit extends directly into the wellhead of the large-caliber agent injection well.
10. The in-situ remediation equipment for organic-polluted groundwater according to claim 8, wherein a stirring part is arranged in the chemical preparation tank; an electric feeding valve and a medicament flow meter are arranged at the upstream position of a medicament outlet of the medicament conveying pipeline; the addition of the medicament is controlled by an electrically operated valve and metered by a flow meter.
11. The in-situ remediation equipment for organic-polluted groundwater according to claim 8 or 10, wherein the agent preparation tank comprises an oxidizing agent preparation tank and a catalytic agent preparation tank, which are respectively arranged on two sides of the large-caliber agent injection well; an oxidizing agent conveying pipeline connected with the bottom of the oxidizing agent preparation tank and a catalytic agent conveying pipeline connected with the bottom of the catalytic agent preparation tank respectively extend into the well mouth from two sides of the large-caliber agent injection well.
12. The in-situ remediation device of organic-contaminated groundwater according to claim 1, further comprising: a tail gas treatment system;
the wellhead of the small-caliber vacuum extraction well is hermetically connected with the inlet of the gas pipeline; the outlet of the gas pipeline is hermetically connected with the gas inlet on the side wall of the vacuum extraction gas-liquid separator; the vacuum extraction gas-liquid separator is connected with a water ring vacuum pump through an extraction pipeline; the bottom of the vacuum extraction gas-liquid separator is provided with a liquid outlet.
13. The in-situ remediation equipment for organic contaminated groundwater according to claim 12, wherein the liquid outlet at the bottom of the vacuum extraction gas-liquid separator extends below the liquid level in the large-caliber chemical injection well through a liquid conveying pipeline and forms a liquid seal.
14. The in-situ remediation device for organic-contaminated groundwater according to claim 12, wherein the small-caliber vacuum extraction well comprises a closed section of a vacuum extraction well pipe and an open section of a vacuum extraction well pipe; closing the well wall of the closed section of the vacuum extraction well pipe; and a plurality of through holes are distributed on the well wall of the open hole section of the vacuum extraction well pipe.
15. The in-situ remediation device of organic-contaminated groundwater according to claim 14, wherein the aperture size of the through hole is Φ 20mm- Φ 40 mm.
16. The in-situ remediation device for organic-polluted groundwater according to claim 14, wherein a position from a top wellhead of the small-caliber vacuum extraction well to 1-7m underground is a closed section of a vacuum extraction well pipe; the position 7-12m underground of the small-caliber vacuum extraction well to the bottom of the well is an open hole section of a vacuum extraction well pipe.
17. The in-situ remediation device for organic-polluted groundwater according to claim 16, wherein a position from a top wellhead of the small-caliber vacuum extraction well to 7m underground is a closed section of a vacuum extraction well pipe; the position 7m underground of the small-caliber vacuum extraction well to the bottom of the well is an open hole section of a vacuum extraction well pipe.
18. The in-situ remediation equipment of organic-contaminated groundwater according to claim 12, wherein the tail gas treatment system comprises an activated carbon adsorption tower;
the gas inlet of the side wall of the activated carbon adsorption tower of the tail gas treatment system is communicated with the gas outlet at the top of the vacuum extraction gas-liquid separator of the vacuum extraction system through a gas pipeline, the activated carbon adsorption tower of the tail gas treatment system can be connected with a water ring vacuum pump through an extraction pipeline, and the bottom of the activated carbon adsorption tower is provided with a liquid outlet.
19. The in-situ remediation device for organic-contaminated groundwater according to claim 18, wherein the liquid outlet at the bottom of the activated carbon adsorption tower extends below the liquid level in the large-caliber chemical injection well through a liquid conveying pipeline and forms a liquid seal.
20. The in-situ remediation device of organic contaminated groundwater according to claim 19, wherein an activated carbon adsorption layer is provided in the activated carbon adsorption tower.
21. The in-situ remediation equipment for organic-polluted groundwater according to claim 1 or 18, wherein the vacuum extraction system further comprises a vacuum buffer tank;
a gas inlet on the side wall of the vacuum buffer tank is communicated with a gas outlet on the top of an activated carbon adsorption tower of the tail gas treatment system through a gas pipeline; the top opening of the vacuum buffer tank is connected with a water ring vacuum pump through an extraction pipeline; the bottom of the vacuum buffer tank is provided with a liquid outlet.
22. The in-situ remediation device of organic contaminated groundwater according to claim 21, wherein the liquid outlet at the bottom of the vacuum buffer tank extends below the liquid level in the large-caliber chemical injection well through a liquid delivery pipe and forms a liquid seal.
23. An in-situ remediation process of organic-polluted groundwater, characterized in that the soil and groundwater in the underground area to be remediated is remediated by using the in-situ remediation equipment of organic-polluted groundwater as claimed in any one of claims 1 to 22.
24. The in-situ remediation process of organic contaminated groundwater according to claim 23, wherein the agent is directly flowed into the large-caliber agent injection well via an agent delivery conduit inserted into the wellhead of the large-caliber agent injection well.
25. The in-situ remediation process of organic contaminated groundwater according to claim 23 or 24, wherein the vacuum extraction system and the tail gas treatment system are started, volatile gas of organic contaminants generated underground after treatment with the chemical is extracted to the ground for gas-liquid separation, and the separated contaminated gas is adsorbed by an activated carbon adsorption tower.
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