CN112374692B - Repairing device and method for underground water petroleum hydrocarbon pollution - Google Patents
Repairing device and method for underground water petroleum hydrocarbon pollution Download PDFInfo
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- CN112374692B CN112374692B CN202011207750.8A CN202011207750A CN112374692B CN 112374692 B CN112374692 B CN 112374692B CN 202011207750 A CN202011207750 A CN 202011207750A CN 112374692 B CN112374692 B CN 112374692B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
Abstract
The invention discloses a repairing device for petroleum hydrocarbon pollution of underground water, which comprises a horizontal repairing well and a polyethylene pipe arranged in the horizontal repairing well, wherein the polyethylene pipe comprises a first inclined pipe section, a hole sieve pipe section and a second inclined pipe section which are sequentially connected, the hole sieve pipe section is positioned below an underground water line, the first inclined pipe section and the second inclined pipe section extend to above the ground, sieve holes are formed in the hole sieve pipe section, steel wires are wound outside the hole sieve pipe section, and the hole sieve pipe section wound with the steel wires is coated with a geotechnical filter screen. The invention also discloses a repairing method aiming at underground water petroleum hydrocarbon pollution, which can meet the towing requirement of a horizontal directional drilling machine; ensuring the injection of the medicament on the basis of not damaging the strength of the well pipe; solves the problem of blocking sieve holes; can repair groundwater for a long time.
Description
Technical Field
The invention belongs to the field of soil and groundwater remediation, and particularly relates to a remediation device for groundwater petroleum hydrocarbon pollution and a remediation method for groundwater petroleum hydrocarbon pollution.
Background
The in-situ remediation technology for the polluted underground water is widely applied due to the wide application range, various remediation pollutant types, low price and the like.
The in-situ chemical oxidation technology is most widely applied, and the in-situ chemical oxidation technology is often sampled to repair groundwater polluted by organic matters such as petroleum hydrocarbon, benzene series, phenols, chlorinated hydrocarbon, polycyclic aromatic hydrocarbon, pesticides and the like at present.
Especially, because the underground storage tank and pipeline such as filling station leak for a long time because the petroleum hydrocarbon pollutes underground water, the underground water generally has the petroleum hydrocarbon pollution, can utilize this device to produce better effect in excavation and the unable prosthetic region of conventional normal position chemical oxidation.
The traditional in-situ chemical oxidation technology of groundwater needs to construct a vertical well or dig a trench to inject an oxidizing agent so as to achieve the contact and reaction between the agent and the groundwater pollutant.
However, in many situations, such as in production facilities, roads, tracks, storage tank areas, etc., the construction or excavation of vertical wells is not satisfactory and conventional groundwater remediation techniques cannot be implemented.
Disclosure of Invention
In order to solve the problems and overcome the defects of the prior art, the invention aims to provide a repairing device for underground water petroleum hydrocarbon pollution and a repairing method for underground water petroleum hydrocarbon pollution, and the repairing device is simple to operate and high in practicability, and particularly aims to repair petroleum hydrocarbon and similar pollutants.
The above object of the present invention is achieved by the following technical solutions:
the utility model provides a prosthetic devices to groundwater petroleum hydrocarbon pollutes, includes the horizontal repair well, still includes the polyethylene pipe that sets up in the horizontal repair well, the polyethylene pipe including the first oblique pipeline section that connects gradually, hole sieve pipeline section and second oblique pipeline section, hole sieve pipeline section is located below the groundwater level line, first oblique pipeline section and second oblique pipeline section extend to above ground, the sieve mesh has been seted up on the hole sieve pipeline section, the outside winding of hole sieve pipeline section has the steel wire, the cladding of the hole sieve pipeline section that winds has the steel wire has the geotechnical filter screen, the horizontal repair well is including the section that traveles that is located below the groundwater level line and the section that traveles to the ground that is located at the section both ends that traveles, first oblique pipeline section and second oblique pipeline section are located the section that traveles to the ground at the section both ends respectively, hole sieve pipeline section is located the section that traveles.
The same cross section of the perforated screen pipe section is uniformly distributed with a plurality of screen holes, the plurality of screen holes uniformly distributed on the same cross section of the perforated screen pipe section form a group of screen holes, and a plurality of groups of screen holes are distributed along the perforated screen pipe section.
The diameter of the sieve holes is 1-4 mm, and the distance between the sieve holes of adjacent groups is 10-20 cm.
The outside of geotechnical filter screen is provided with a plurality of fasteners, and the interval of fastener is 1 ~ 3m.
A method for remediation of groundwater petroleum hydrocarbon pollution comprising the steps of:
step 1, guiding an underground drill bit on the ground through a handheld guiding system, and drilling according to a designated depth and a designated direction to form a horizontal repair well;
the method comprises the steps that a first inclined pipe section and a second inclined pipe section are arranged in deflecting sections extending towards the ground at two ends of a crossing section, a hole sieve pipe section is arranged in the crossing section, the crossing section is located in a polluted groundwater area, sieve holes are formed in the hole sieve pipe section in the crossing section, the first inclined pipe section and the second inclined pipe section do not open the sieve holes, and sediment in a polyethylene pipe is cleaned through a blower or an air compressor;
step 4, oxidizing agent injection: starting an air compressor to drive a diaphragm pump to work, injecting the prepared oxidation agent into a horizontal repair well under the ground through a polyethylene pipe, monitoring the pressure in the polyethylene pipe, controlling the injection pressure, and stopping injection after reaching the injection quantity; and controlling the injection of the oxidizing agents in the repair wells at different levels through valve switches on the injection pipelines.
And 5, after the injection construction of the medicament to be oxidized is completed for 2-3 weeks, starting the injection of the oxygen release medicament.
The mixed solution of the oxidizing agent sodium persulfate and the sodium hydroxide in a mass ratio of 10:4 is prepared.
The oxygen-releasing agent is calcium peroxide slurry with a mass concentration of 25% or less.
According to the invention, the chemical is injected into the target groundwater pollution area through the horizontal recovery well, so that the chemical is contacted with pollutants in groundwater at the crossing section of the horizontal recovery well, and the pollutants in groundwater are converted into substances which are nontoxic or have low toxicity to the surrounding environment or human body through the oxidation. After the injection of the oxidizing agent is finished, calcium peroxide is injected to strengthen the microbial oxidation of the groundwater and realize long-term restoration of the polluted groundwater.
Compared with the prior art, the invention has the following beneficial effects:
1. the polyethylene pipe is made of polyethylene, has strong toughness and can meet the towing requirement of a horizontal directional drilling machine;
2. the screen holes are formed in the section of the screen hole, so that the injection of the medicament is ensured on the basis of not damaging the strength of the well pipe;
3. the geotechnical filter screen is arranged at the screen holes to solve the problem of blocking the screen holes;
4. the underground water pollution area which cannot be repaired by the traditional well can be repaired;
5. the underground water can be repaired for a long time through oxidation and biological reinforcement repair.
Drawings
FIG. 1 is a schematic side view of the present invention;
FIG. 2 is an enlarged view of a portion of the present invention;
FIG. 3 is a schematic cross-sectional view of the present invention;
in the figure: 1-polyethylene pipe; 2-a first inclined tube section; 3-a section of the pore sieve; 4-a second inclined tube section; 5-sieve pores; 6-steel wire; 7-a geotechnical filter screen; 8-fastening pieces; 9-ground; 10-ground water level line.
Specific technical scheme
The present invention will be further described in detail below in conjunction with the following examples, for the purpose of facilitating understanding and practicing the present invention by those of ordinary skill in the art, it being understood that the examples described herein are for the purpose of illustration and explanation only and are not intended to limit the invention.
Example 1:
the utility model provides a prosthetic devices to groundwater petroleum hydrocarbon pollutes, includes horizontal repair well and sets up the polyethylene pipe 1 in horizontal repair well, polyethylene pipe 1 including the first oblique pipeline section 2 that connects gradually, hole sieve pipeline section 3 and second oblique pipeline section 4, hole sieve pipeline section 3 buries below the groundwater level line, first oblique pipeline section 2 and second oblique pipeline section 4 extend to above ground, set up sieve mesh 5 on the hole sieve pipeline section 3, the outside winding of hole sieve pipeline section 3 has steel wire 6, the cladding of the hole sieve pipeline section 3 of winding has steel wire 6 has geotechnical filter screen 7.
The horizontal repair well comprises a traversing section below the ground water line and a deflecting section extending to the ground at two ends of the traversing section. The first inclined pipe section 2 and the second inclined pipe section 4 are respectively positioned at the deflecting sections extending towards the ground at the two ends of the crossing section, and the hole sieve pipe section 3 is positioned in the crossing section.
The polyethylene pipe 1 takes a high-density polyethylene (HDPE) pipe as a main body, generally adopts pipe diameters DN50 and DN75, and has the characteristics of strong flexibility, stretch resistance, corrosion resistance and aging resistance, and is particularly suitable for pipes of underground water horizontal restoration wells.
Typically groundwater well pipes, such as PVC pipe and steel pipe, the screen area is in the form of a slotted screen. The polyethylene pipe 1, the tensile strength of the polyethylene pipe 1 can be damaged by the slotted screen, the structural strength is easy to damage when the horizontal directional drilling is pulled back, and meanwhile, the screen slot can be greatly deformed, so that the water permeability effect of the screen pipe is affected.
The same cross section of the perforated screen section 3 is uniformly distributed with a plurality of screen holes 5, the same cross section of the perforated screen section 3 is uniformly distributed with a plurality of screen holes 5 to form a group of screen holes, and a plurality of groups of screen holes 5 are distributed along the perforated screen section 3. The aperture diameter of the sieve holes 5 is 1-4 mm, and the distance between the sieve holes 5 of adjacent groups is 10-20 cm.
The sieve tube area of the invention adopts a small-hole sieve, namely, a plurality of groups of sieve holes 5 are arranged on the hole sieve tube section 3 of the groundwater section to be repaired, the hole distances of the sieve holes 5 of each group are different from 10 cm to 20cm, the aperture is preferably 2.5mm, and 3 to 4 sieve holes 5 are uniformly distributed on the same section.
After the hole sieve tube section 3 is manufactured, further wire winding is carried out on the hole sieve tube section 3, and the wire winding is generally steel wires with the diameter not more than 2.3mm and is used as an inner layer reinforcing structure and a screen structure. According to the soil layer condition of the groundwater repair area, the gap width of the wire 6 after wire winding is between 0.5mm and 10 mm.
The outside of the geotechnical filter screen 7 is provided with a plurality of fastening pieces 8, and the interval between the fastening pieces 8 is 1-3 m.
The coiled perforated screen section 3 is wrapped by a geotechnical filter screen 7, the geotechnical filter screen 7 is a permeable geotechnical material which is prepared by compounding polymer materials such as polypropylene or polyethylene through mechanical consolidation, chemical and other bonding methods, and is generally 200 g of geotechnical filter screen, namely 200 g of geotechnical filter screen is obtained per square meter, and the material is corrosion-resistant, acid-base-resistant and long in service life. Can effectively prevent sand particles and clay from entering the pore sieve tube section 3, prevent excessive sediment deposited in the pore sieve tube section 3 and influence the injection of the medicament.
Further, in order to prevent the geotechnical filter 7 from slipping and moving, fastening members 8 are fastened around the geotechnical filter 7, and the fastening members 8 are spaced 1 to 3m apart.
Still include medicament injection system, medicament injection system includes medicament jar, diaphragm pump, air compressor machine, injection pipeline, manometer and valve switch, and the medicament jar passes through the diaphragm pump and is connected with injection pipeline, and the air compressor machine is connected with the diaphragm pump, provides power for the diaphragm pump, and injection pipeline is connected with the first oblique pipeline section 2 of polyethylene pipe 1, the port shutoff of the oblique pipeline section 4 of second, the port shutoff of the oblique pipeline section at second place, sets up the manometer on the injection pipeline, still sets up valve switch on the injection pipeline.
Example 2
A remediation method for groundwater petroleum hydrocarbon pollution using a remediation device for groundwater petroleum hydrocarbon pollution as described in embodiment 1, comprising the steps of:
step 1, the horizontal directional drill comprises a handheld guiding system and an underground drill bit, and the underground drill bit can be guided on the ground through the handheld guiding system to drill according to the designated depth and direction, so that a horizontal repair well is formed.
After the drill bit is unearthed on the other side of the road, the polyethylene pipe 1 for the petroleum hydrocarbon pollution of the underground water of the embodiment 1 is pulled back, the first inclined pipe section 2 and the second inclined pipe section 4 are arranged in the deflecting sections extending towards the ground at the two ends of the crossing section, the hole sieve pipe section 3 is arranged in the crossing section, the crossing section is positioned in the polluted underground water area, sieve holes are formed in the hole sieve pipe section 3 in the crossing section, and the rest of the first inclined pipe section 2 and the second inclined pipe section 4 do not open the sieve holes. And after the polyethylene pipe 1 is laid back, sediment in the polyethylene pipe 1 is cleaned by a blower or an air compressor.
And 2, after the horizontal repair well and the polyethylene pipe 1 are distributed, preparing an oxidation medicament of the repair medicament. And (3) preparing the repairing medicament according to the process requirement, and calculating the medicament injection quantity according to the pollutant concentration of the crossing section. Because the pollutants are not uniformly distributed in the field, the dosage of the oxidizing agent needs to be increased in the area with higher pollutant concentration, and the dosage of the oxidizing agent needs to be correspondingly reduced in the area with lower pollutant concentration.
And 3, installing a medicament injection system, wherein the medicament injection system comprises a medicament tank, a diaphragm pump, an air compressor, an injection pipeline and a valve switch, and the medicament injection system is required to be installed on site before injection.
The device for repairing the petroleum hydrocarbon pollution of the underground water can be installed and connected with the medicament injection system after the construction of the device for repairing the petroleum hydrocarbon pollution of the underground water is completed.
According to the purchasing of repairing medicament preparation equipment according to repairing requirements, in the embodiment, repairing medicaments comprise an oxidation medicament and an oxygen release medicament, a medicament tank is connected with an injection pipeline through a diaphragm pump, an air compressor is connected with the diaphragm pump and supplies power to the diaphragm pump, the injection pipeline is connected with a first inclined pipe section 2 of a polyethylene pipe 1, a port of a second inclined pipe section 4 is plugged, a port of the inclined pipe section where the second inclined pipe section 4 is located is plugged, a pressure gauge is arranged on the injection pipeline, and a valve switch is also arranged on the injection pipeline.
Step 4, oxidizing agent injection
Starting an air compressor to drive a diaphragm pump to work, injecting the prepared oxidation agent into a horizontal repair well under the ground through a polyethylene pipe 1, monitoring the pressure in the polyethylene pipe 1, controlling the injection pressure (usually within 1 MPa), and stopping injection after reaching the injection amount; and controlling the injection of the oxidizing agents in the repair wells at different levels through valve switches on the injection pipelines.
The injected oxidation medicament is a mixed solution, namely, the prepared sodium persulfate solution (30%) with the mass percentage of 30% and the prepared sodium hydroxide solution (12%) with the mass percentage of 12% are mixed and injected in a mass ratio of 1:1, and the mass ratio of the sodium persulfate to the sodium hydroxide in the oxidation medicament is controlled at 10:4.
And 5, the alkali activated sodium persulfate in the oxidizing agent has shorter aging (about two to three weeks), and after the oxidizing agent injection construction is completed, about 2 to 3 weeks, the second round of injection is started, and the oxygen release agent for the second round of injection adopts an oxygen release compound (oxygen-releasing compound), so that a long-term oxygen source can be provided for degrading petroleum hydrocarbon in groundwater, and the long-term biodegradation of the petroleum hydrocarbon is promoted. The oxygen-releasing agent can be calcium peroxide, and the calcium peroxide is injected after pulping. The mass concentration of pulping is controlled within 25%, and because calcium peroxide is powdery solid, the calcium peroxide and water are mixed according to a certain proportion to prepare the pulp, and then the pulp can be injected by injection equipment. The early stage is subjected to a small test, and the mass concentration is about 25% more suitable. Thus, the concentration of the medicament can be ensured, and the medicament is not too thick, so that blockage is caused. Affecting the diffusion effect of the calcium peroxide.
It should be noted that the specific embodiments described in this application are merely illustrative of the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or its scope as defined in the accompanying claims.
Claims (1)
1. A restoration method for underground water petroleum hydrocarbon pollution utilizes a restoration device for underground water petroleum hydrocarbon pollution, which comprises a horizontal restoration well and also comprises a polyethylene pipe (1) arranged in the horizontal restoration well, wherein the polyethylene pipe (1) comprises a first inclined pipe section (2), a hole sieve pipe section (3) and a second inclined pipe section (4) which are sequentially connected, the hole sieve pipe section (3) is positioned below an underground water level line, the first inclined pipe section (2) and the second inclined pipe section (4) extend to the ground, sieve holes (5) are formed in the hole sieve pipe section (3), steel wires (6) are wound outside the hole sieve pipe section (3), the hole sieve pipe section (3) is wrapped with a filter screen (7), the horizontal restoration well comprises a crossing section positioned below the underground water level line and a sloping section which extends to the ground and is positioned at two ends of the crossing section, the first inclined pipe section (2) and the second inclined pipe section (4) are respectively positioned at the sloping sections which extend to the ground, the hole sieve holes (3) are positioned in the underground water level line, sieve holes (5) are uniformly distributed in groups of sieve holes (5) which are distributed along the sieve holes (5 cm, the sieve holes (5) are uniformly distributed in the same groups (5 mm, the sieve holes (5) are distributed along the sieve holes (5) and the sieve holes (5 mm (5) and the sieve holes are distributed along the same groups (5 mm, the sieve holes (5 mm) and the sieve holes are uniformly distributed along the sieve holes (5), a plurality of fasteners (8) are arranged outside the geotechnical filter screen (7), the distance between the fasteners (8) is 1-3 m,
the method is characterized by comprising the following steps:
step 1, guiding an underground drill bit on the ground through a handheld guiding system, and drilling according to a designated depth and a designated direction to form a horizontal repair well;
the first inclined pipe section (2) and the second inclined pipe section (4) are arranged in the deflecting sections extending towards the ground at the two ends of the crossing section, the pore sieve pipe section (3) is arranged in the crossing section, the crossing section is positioned in a polluted groundwater area, sieve pores are formed in the pore sieve pipe section (3) in the crossing section, the first inclined pipe section (2) and the second inclined pipe section (4) do not open the sieve pores, and sediment in the polyethylene pipe (1) is cleaned through a blower or an air compressor;
step 2, preparing an oxidation agent after the horizontal repair well and the polyethylene pipe (1) are distributed;
step 3, installing a medicament tank, a diaphragm pump, an air compressor, an injection pipeline and a valve switch;
step 4, oxidizing agent injection: starting an air compressor to drive a diaphragm pump to work, injecting the prepared oxidation agent into a horizontal repair well under the ground through a polyethylene pipe (1), monitoring the pressure in the polyethylene pipe (1), controlling the injection pressure, and stopping injection after the injection amount is reached; controlling the injection of the oxidizing agent in the repair wells with different levels through valve switches on the injection pipeline;
step 5, after the injection construction of the medicament to be oxidized is completed for 2 to 3 weeks, the injection of the oxygen release medicament is started,
the mixed solution of the oxidation agent sodium persulfate and the sodium hydroxide in a mass ratio of 10:4, and the oxygen release agent is calcium peroxide slurry with a mass concentration of less than or equal to 25%.
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| CN112374692B true CN112374692B (en) | 2023-06-02 |
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| CN113385526A (en) * | 2021-03-11 | 2021-09-14 | 江苏大地益源环境修复有限公司 | Horizontal well injection repairing method and device for shallow organic pollution site |
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| CN106554073A (en) * | 2016-12-07 | 2017-04-05 | 中国地质大学（武汉） | A kind of slow-release oxygen material of subsoil water in-situ immobilization and preparation method thereof |
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