CN108380660B - Multilayer in-situ medicine injection method for contaminated site - Google Patents
Multilayer in-situ medicine injection method for contaminated site Download PDFInfo
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- CN108380660B CN108380660B CN201810088791.6A CN201810088791A CN108380660B CN 108380660 B CN108380660 B CN 108380660B CN 201810088791 A CN201810088791 A CN 201810088791A CN 108380660 B CN108380660 B CN 108380660B
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- 238000002347 injection Methods 0.000 title claims abstract description 171
- 239000007924 injection Substances 0.000 title claims abstract description 171
- 239000003814 drug Substances 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 78
- 239000010959 steel Substances 0.000 claims abstract description 78
- 229940079593 drug Drugs 0.000 claims abstract description 53
- 239000002689 soil Substances 0.000 claims abstract description 39
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 238000003825 pressing Methods 0.000 claims abstract description 18
- 230000008439 repair process Effects 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims description 25
- 239000000523 sample Substances 0.000 claims description 10
- 238000012377 drug delivery Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 238000011835 investigation Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 abstract description 19
- 230000001276 controlling effect Effects 0.000 description 11
- 238000009792 diffusion process Methods 0.000 description 6
- 238000005067 remediation Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011066 ex-situ storage Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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 multilayer in-situ medicine injection method for a polluted site, which comprises the following steps: (1) pressing a drug injection steel pipe to a first-level depth in a soil body; arranging a pipe sealing cover at the upper port of the drug injection steel pipe to form a closed cavity, and pumping a repairing agent into the drug injection steel pipe to repair within a first-stage depth range; (2) disassembling the pipe sealing cover, connecting the long medicine injection steel pipe by using the connecting pipe group and pressing the long medicine injection steel pipe to the second-level depth in the soil body, hermetically installing the disassembled pipe sealing cover to the upper port of the connecting pipe group, and pumping the repairing agent into the medicine injection steel pipe to perform medicine injection repairing within the second-level depth range; (3) and (3) performing reciprocating operation according to the step (2), and sequentially completing the injection repair within each level of depth range by lengthening the injection steel pipe. The multi-layer in-situ injection method has the advantages that the multi-layer in-situ injection method is convenient and easy to operate, and multi-layer fixed-depth injection from shallow depth to deep depth can be realized within the pollution depth range through the lengthening arrangement of the connecting pipe group on the injection steel pipe.
Description
Technical Field
The invention belongs to the technical field of polluted soil remediation, and particularly relates to a multi-level in-situ pesticide injection method for a polluted site.
Background
With the rapid development of industrialization in China, the soil environment is continuously harmed by various pollutions, and meanwhile, the requirements for remediation and treatment of polluted soil are increasing. At present, the restoration treatment technology aiming at the polluted soil sample can be divided into in-situ restoration and ex-situ restoration according to disposal places, and the in-situ restoration technology is a hotspot selected by the future restoration technology due to low cost, low energy consumption and no secondary pollution. The in-situ repair treatment technology mainly comprises heat treatment, a chemical oxidation method, multiphase extraction, a biological method and the like, and the chemical oxidation technology has quick effect and controllable cost and is widely applied to field engineering repair. In-situ remediation techniques are divided into in-situ injection and in-situ agitation according to embodiments.
In the normal position restoration process, because the difference of the restoration place pollution degree of depth, the injection pipe of fixed length can increase the vertical distance of carrying to the medicament injection of shallow soil layer, has increased the injection degree of difficulty, has also caused the unnecessary waste of restoration medicament simultaneously. Meanwhile, for a repair site with poor permeability, the injection pipe is inserted to fix the injection depth of the injection medicament, the repair medicament cannot be diffused to the pollution depth, the medicament needs to be added in multiple depths and multiple levels, and the diffusion depth and range of the medicament in the repair area are increased.
Disclosure of Invention
The invention aims to provide a multi-level in-situ chemical injection method for a polluted site according to the defects of the prior art, and the chemical injection method realizes the fixed-depth injection of in-situ chemicals by arranging an open-detachable connecting pipe group at the end part of a chemical injection steel pipe; meanwhile, a tube sealing cover is arranged at the upper end opening of the drug injection steel tube or the upper end opening of the connecting tube group, so that the tube cavity is ensured to be sealed, and certain drug injection pressure can be formed during drug injection.
The purpose of the invention is realized by the following technical scheme:
a multi-level in-situ medicine injection method for a polluted site is characterized by comprising the following steps: (1) pressing a medicine injection steel pipe uniformly provided with a plurality of medicine outlet holes to a first-stage depth in a soil body; arranging a pipe sealing cover at the upper port of the drug injection steel pipe to enable the drug injection steel pipe to form a closed cavity, pumping a repairing medicament into the closed drug injection steel pipe, and spraying the repairing medicament into soil outside the pipe through the drug outlet holes to repair the soil within a first-stage depth range; (2) disassembling the pipe sealing cover, lengthening the medicine injection steel pipe by using a connecting pipe group, pressing the medicine injection steel pipe to a second-stage depth in a soil body, hermetically installing the disassembled pipe sealing cover to the upper port of the connecting pipe group, and pumping a repairing medicament into the medicine injection steel pipe to perform medicine injection repairing within the second-stage depth range; (3) and (3) performing reciprocating operation according to the step (2), and sequentially completing the injection repair within each level of depth range by lengthening the injection steel pipe.
The front end of the medicine injection steel pipe is connected with a conical probe, and the diameter of the upper part of the conical probe is larger than that of the medicine injection steel pipe.
The seal tube cover is in threaded fit connection with the upper port of the drug injection steel tube and the upper port of the connecting tube set.
The sealing tube cover is provided with a medicine injection hole and an exhaust hole, the medicine injection hole is communicated with the booster pump and the medicine stirring barrel through a medicine conveying hose, and the booster pump is provided with a pressure controller and a flow control meter.
The connecting pipe group comprises at least one section of connecting steel pipe, and is adjacent to the connecting steel pipe, and a detachable threaded connection structure is adopted between the connecting steel pipes.
The medicine injection device is characterized in that a plurality of medicine outlet holes are uniformly distributed on the pipe wall of the medicine injection steel pipe, and anti-blocking protective boots are arranged on the pipe wall at the upper edge parts of the medicine outlet holes.
Before construction, stratum distribution data of a to-be-repaired polluted site are obtained through investigation, and the injection flow and the injection pressure of the injection steel pipe are adjusted according to the stratum where the injection steel pipe is pressed into the depth.
When the pressing depth of the injection steel pipe is in a sandy soil layer, controlling the injection pressure to be 0.2-0.3Mpa and controlling the injection flow to be 10-30L/min; when the pressing depth of the injection steel pipe is in the cohesive soil layer, the injection pressure is controlled to be 0.2-0.5Mpa, and the injection flow is controlled to be 7-15L/min.
When the pressing depth of the injection steel pipe is in a sandy soil layer, controlling the injection pressure to be 0.25Mpa and controlling the injection flow to be 20L/min; when the pressing depth of the injection steel pipe is in the cohesive soil layer, the injection pressure is controlled to be 0.35Mpa, and the injection flow is controlled to be 11.5L/min.
The invention has the advantages that: the multi-level in-situ injection method is convenient and easy to operate, multi-level fixed-depth injection from shallow to deep in a pollution depth range can be realized by the lengthening arrangement of the connecting pipe group on the injection steel pipe, the controllability and uniformity of an agent diffusion range can be realized by controlling the injection flow and the injection pressure of different soil layers in the agent injection process, the corresponding loss is reduced, and the agent utilization rate is improved; the pipe sealing cover arranged at the upper end opening of the medicine injection steel pipe or the upper end opening of the connecting pipe group can ensure that a closed environment is formed in the medicine injection pipe cavity, so that certain medicine injection pressure can be formed during medicine injection, the medicine diffusion depth and the diffusion range during medicine injection repair are increased, and the blockage of the orifice can be prevented through the arrangement of the anti-blocking protection boots above the medicine injection holes.
Drawings
FIG. 1 is a schematic structural view of a multi-layer in-situ drug injection device according to the present invention;
FIG. 2 is a schematic structural view of a multi-layer in-situ drug injection device without a connecting tube set according to the present invention;
FIG. 3 is a schematic flow chart of the multi-level in-situ drug injection method of the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
referring to fig. 1-3, the labels 1-15 in the figures are: the device comprises a conical probe 1, a drug injection steel pipe 2, a connecting pipe group 3, a tube sealing cover 4, a drug injection hole 5, an exhaust hole 6, a connecting steel pipe 7, a connecting thread 8, an anti-blocking protective boot 9, a drug outlet hole 10, a drug delivery hose 11a, a drug delivery hose 11b, a flow control meter 12, a pressure controller 13, a booster pump 14 and a drug stirring barrel 15.
Example (b): as shown in fig. 1, 2 and 3, the present embodiment specifically relates to a multilayer in-situ drug injection method for a contaminated site, which specifically includes the following steps:
(1) the method comprises the steps of acquiring stratum distribution conditions of a polluted area to be repaired through exploration, and then uniformly distributing a plurality of injection points in the range of the polluted area to be repaired; setting the arrangement spacing of injection points to be 2m by 2m, and encrypting the arrangement spacing in a serious pollution area; meanwhile, in each injection point, the depth of each stage which needs to be repaired by injecting medicine is determined, for example, in the embodiment, the depth of the first stage is 0.5m, the depth of the second stage is 1.0m, the depth of the third stage is 1.5m …, and the depth of the nth stage is 0.5n m;
(2) the preparation of the repairing medicament solution is completed in the medicament stirring barrel 15, the medicament stirring barrel 15 is communicated with a liquid inlet of the booster pump 14 through a medicament conveying hose 11a, and meanwhile, a liquid outlet of the booster pump 14 is communicated with the medicament injection hole 5 on the tube sealing cover 4 through a medicament conveying hose 11b, so that the preparation work before medicament injection is completed;
(3) assembling the drug injection steel pipe 2, combining and connecting the conical probe 1 and the single-section drug injection steel pipe 2 together, uniformly distributing a plurality of drug outlet holes 10 on the wall surface of the drug injection steel pipe 2, and arranging anti-blocking protection boots 9 on the pipe wall surface of the upper edge part of each drug outlet hole 10, wherein the anti-blocking protection boots 9 can prevent the orifice from being blocked;
then, inserting the single-joint medicine injection steel pipe 2 and the conical probe 1 thereof into the first-stage depth of the soil body at each injection point by using a pressing and pulling device, wherein the first-stage depth is selected to be 0.5m of the shallow part of the soil body in the embodiment; in the process of pressing soil into the well body, the diameter of the upper part of the conical probe 1 is larger than that of the drug injection steel pipe 2, so that the conical probe 1 forms a drug injection well mouth with a larger well diameter, thereby preventing the soil body around the well wall from extruding to the pipe wall of the drug injection steel pipe 2 and the drug outlet hole 10 and playing a role of preventing blockage;
after the drug injection steel pipe 2 is inserted in place, the pipe sealing cover 4 is screwed to the upper end pipe orifice of the drug injection steel pipe 2 by using the connecting thread 8; the tube sealing cover 4 seals the space in the drug injection steel tube 2 to form a sealed cavity, and simultaneously, under the action of the booster pump 14, the drug injection pressure and the medicament injection effect in the sealed cavity can be improved; wherein, the center of the tube sealing cover 4 is provided with a drug injection hole 5, the drug injection hole 5 is communicated with a booster pump 14 through a drug delivery hose 11b, and a drug solution can be injected into the tube cavity of the drug injection steel tube 2; in addition, the tube sealing cover 4 is also provided with an exhaust hole 6 which can periodically exhaust gas in the tube;
(4) starting a booster pump 14 to pump the repairing agent solution in the agent stirring barrel 15 into the agent injection steel pipe 2 through the agent delivery hose 11 and the agent injection hole 5 at a certain agent injection pressure and agent injection flow rate; under the action of pump pressure, the remediation agent solution is uniformly sprayed into the soil body through the drug outlet holes 10 of the drug injection steel pipe 2, and the remediation agent solution and the polluted soil are subjected to chemical reaction, so that the polluted soil body at the first-stage depth is remedied;
(5) after the agent reacts in the soil body within the first-level depth range for a period of time, the pipe sealing cover 4 is detached from the port of the drug injection steel pipe 2, the connecting pipe group 3 is installed at the upper port of the drug injection steel pipe 2 in a threaded fit manner, the connecting pipe group 3 at least comprises a section of connecting steel pipe 7, in the construction process, the section composition number of the connecting pipe group 3 is selected according to the depth of the needed drug injection, in the embodiment, a section of connecting steel pipe 7 is actually installed at the upper port of the drug injection steel pipe 2, and connecting threads 8 are arranged at two end parts of the connecting steel pipe 7;
then, the tube sealing cover 4 which is detached before is screwed on the upper port of the connecting steel tube 7 again to seal the tube body to form a closed cavity, and meanwhile, air in the tube cavity can be properly discharged through the exhaust hole 6; pressing the drug injection steel pipe 2 to the underground second-level depth position by using the pressing and pulling device again, repeating the drug injection step in the step (4), and performing drug injection repair on the soil body within the second-level depth range;
(6) repeating the steps (4) and (5), and sequentially completing the injection of the repairing medicament at each level of depth position (third level depth, fourth level depth and …) in each hole by connecting the long connecting pipe group 3, thereby performing in-situ repair on the polluted site;
it should be noted that, when the contaminated soil in the depth ranges of the above-mentioned stages is subjected to chemical injection remediation, the stratum in which the depths of the stages are located should be determined, and the densities of the sandy soil layer and the cohesive soil layer are completely different, so that the pressure controller 13 in the booster pump 14 is used for regulating and controlling the injection pressure, and the flow control meter 12 is used for regulating and controlling the injection flow; for example:
when the pressed nth depth range of the injection steel pipe 2 is in a sandy soil layer, controlling the injection pressure to be 0.2-0.3Mpa and controlling the injection flow to be 10-30L/min; in the embodiment, the injection pressure is preferably 0.25Mpa, and the injection flow is preferably 20L/min;
when the pressed nth depth range of the chemical injection steel pipe 2 is in the cohesive soil layer, controlling the chemical injection pressure to be 0.2-0.5Mpa and controlling the chemical injection flow to be 7-15L/min; in the embodiment, the injection pressure is preferably 0.35Mpa, and the injection flow is preferably 11.5L/min;
the injection pressure and the injection flow parameters are correspondingly adjusted and changed according to the soil layer type, so that the uniformity of the diffusion range radius of the repairing agent at each injection point in the depth direction can be ensured, the diffusion radius of the repairing agent at each level of depth position is prevented from generating difference, and the repairing agent in the adjacent injection point is prevented from generating cross to cause the waste of the repairing agent.
(7) After a period of time, sampling and testing are carried out, and injection work is continuously carried out on the injection area which does not reach the repair target until the drug injection steel pipe 2 and the connecting pipe group 3 are pulled out after the repair target is finished.
Claims (9)
1. A multi-level in-situ medicine injection method for a polluted site is characterized by comprising the following steps: (1) pressing a medicine injection steel pipe uniformly provided with a plurality of medicine outlet holes to a first-stage depth in a soil body; arranging a pipe sealing cover at the upper port of the drug injection steel pipe to enable the drug injection steel pipe to form a closed cavity, pumping a repairing medicament into the closed drug injection steel pipe, and spraying the repairing medicament into soil outside the pipe through the drug outlet holes to repair the soil within a first-stage depth range; (2) disassembling the pipe sealing cover, lengthening the medicine injection steel pipe by using a connecting pipe group, pressing the medicine injection steel pipe to a second-stage depth in a soil body, hermetically installing the disassembled pipe sealing cover to the upper port of the connecting pipe group, and pumping a repairing medicament into the medicine injection steel pipe to perform medicine injection repairing within the second-stage depth range; (3) and (3) performing reciprocating operation according to the step (2), and sequentially completing the injection repair within each level of depth range by lengthening the injection steel pipe.
2. The multi-level in-situ chemical injection method for the polluted site as claimed in claim 1, wherein the front end of the chemical injection steel tube is connected with a conical probe, and the diameter of the upper part of the conical probe is larger than that of the chemical injection steel tube.
3. The method of claim 1, wherein the cap is in threaded engagement with the upper port of the injection steel tube and the upper port of the connection tube set.
4. The method of claim 1, wherein the cap has a drug hole and an air vent, the drug hole is connected to a booster pump and a drug mixing tank through a drug delivery hose, and the booster pump has a pressure controller and a flow control meter.
5. The method according to claim 1, wherein the connection pipe set comprises at least one connection steel pipe, and a detachable threaded connection structure is adopted between adjacent connection steel pipes.
6. The multi-level in-situ chemical injection method for contaminated sites as claimed in claim 1, wherein the plurality of chemical outlets are uniformly distributed on the wall of the chemical injection steel tube, and anti-blocking protection boots are disposed on the wall of the chemical outlets.
7. The method of claim 1, wherein before construction, the stratum distribution data of the polluted site to be repaired is obtained by investigation, and the injection flow and pressure of the injection steel pipe are adjusted according to the stratum where the injection steel pipe is pressed into the polluted site.
8. The multi-level in-situ chemical injection method for the polluted site as claimed in claim 7, wherein when the pressing depth of the chemical injection steel pipe is in the sandy soil layer, the chemical injection pressure is controlled to be 0.2-0.3Mpa, and the chemical injection flow is controlled to be 10-30L/min; when the pressing depth of the injection steel pipe is in the cohesive soil layer, the injection pressure is controlled to be 0.2-0.5Mpa, and the injection flow is controlled to be 7-15L/min.
9. The multi-level in-situ chemical injection method for the polluted site as claimed in claim 8, wherein when the pressing depth of the chemical injection steel pipe is in the sandy soil layer, the chemical injection pressure is controlled to be 0.25Mpa, and the chemical injection flow rate is controlled to be 20L/min; when the pressing depth of the injection steel pipe is in the cohesive soil layer, the injection pressure is controlled to be 0.35Mpa, and the injection flow is controlled to be 11.5L/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810088791.6A CN108380660B (en) | 2018-01-30 | 2018-01-30 | Multilayer in-situ medicine injection method for contaminated site |
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| CN201810088791.6A CN108380660B (en) | 2018-01-30 | 2018-01-30 | Multilayer in-situ medicine injection method for contaminated site |
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| CN108380660B true CN108380660B (en) | 2020-10-23 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109821876A (en) * | 2019-01-24 | 2019-05-31 | 湖州师范学院 | A kind of technique for administering heavy metal pollution of soil |
| CN111438177B (en) * | 2020-04-13 | 2021-06-25 | 中国矿业大学 | System for chemical oxidation and microbial remediation cooperate with petroleum hydrocarbon contaminated soil |
| CN113311133B (en) * | 2021-06-23 | 2022-08-09 | 成都理工大学 | Test method for repairing heterogeneous soil groundwater |
| CN113275376A (en) * | 2021-06-24 | 2021-08-20 | 南通大学 | Device and method for repairing polluted soft clay |
| CN115555398A (en) * | 2022-10-13 | 2023-01-03 | 上海勘察设计研究院(集团)有限公司 | A medicament normal position injection equipment for soil remediation engineering |
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|---|---|---|---|---|
| US5645377A (en) * | 1995-05-02 | 1997-07-08 | Christensen Boyles Corporation | Apparatus for insitu remediation of waste through multi-point injection |
| JP2015057267A (en) * | 2013-09-16 | 2015-03-26 | カルト株式会社 | Method of purifying contaminated ground |
| CN105855288A (en) * | 2016-06-01 | 2016-08-17 | 上海岩土工程勘察设计研究院有限公司 | Mobile in-situ quick injection method for contaminated sites |
| CN106001092A (en) * | 2016-06-29 | 2016-10-12 | 上格环境科技（上海）有限公司 | In-situ chemical injection remediation single-well multi-layer injection system |
| CN107096793A (en) * | 2017-06-21 | 2017-08-29 | 南京贻润环境科技有限公司 | It is a kind of to be used for the high-pressure injection boring rod set of in-situ immobilization soil and underground water pollution |
| CN107190742A (en) * | 2017-07-18 | 2017-09-22 | 上海岩土工程勘察设计研究院有限公司 | For grouting method outside slip casting structure outside the stake of steel-pipe pile and stake |
-
2018
- 2018-01-30 CN CN201810088791.6A patent/CN108380660B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5645377A (en) * | 1995-05-02 | 1997-07-08 | Christensen Boyles Corporation | Apparatus for insitu remediation of waste through multi-point injection |
| JP2015057267A (en) * | 2013-09-16 | 2015-03-26 | カルト株式会社 | Method of purifying contaminated ground |
| CN105855288A (en) * | 2016-06-01 | 2016-08-17 | 上海岩土工程勘察设计研究院有限公司 | Mobile in-situ quick injection method for contaminated sites |
| CN106001092A (en) * | 2016-06-29 | 2016-10-12 | 上格环境科技（上海）有限公司 | In-situ chemical injection remediation single-well multi-layer injection system |
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