CN115026123A - In-situ chemical oxidation combined remediation method for land pollution - Google Patents
In-situ chemical oxidation combined remediation method for land pollution Download PDFInfo
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- CN115026123A CN115026123A CN202210698266.2A CN202210698266A CN115026123A CN 115026123 A CN115026123 A CN 115026123A CN 202210698266 A CN202210698266 A CN 202210698266A CN 115026123 A CN115026123 A CN 115026123A
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- well
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- pipe
- rotary spraying
- dissolving
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- 238000005067 remediation Methods 0.000 title claims abstract description 25
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000003647 oxidation Effects 0.000 title claims abstract description 14
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 14
- 239000000126 substance Substances 0.000 title claims abstract description 13
- 238000002347 injection Methods 0.000 claims abstract description 46
- 239000007924 injection Substances 0.000 claims abstract description 46
- 238000005507 spraying Methods 0.000 claims abstract description 38
- 238000010276 construction Methods 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 239000002689 soil Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 230000008439 repair process Effects 0.000 claims abstract description 8
- 239000003814 drug Substances 0.000 claims description 19
- 239000006004 Quartz sand Substances 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000000440 bentonite Substances 0.000 claims description 5
- 229910000278 bentonite Inorganic materials 0.000 claims description 5
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 5
- 239000004927 clay Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 3
- 230000003213 activating effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000007800 oxidant agent Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 238000011109 contamination Methods 0.000 claims 2
- 239000000945 filler Substances 0.000 claims 2
- 239000002957 persistent organic pollutant Substances 0.000 abstract description 4
- 238000004891 communication Methods 0.000 description 4
- 239000012466 permeate Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction 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
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
-
- 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 provides an in-situ chemical oxidation combined remediation method for land pollution, which is used for in-situ remediation of organic polluted soil and underground water and comprises the following steps: determining the area of a land parcel to be repaired and the area of a built structure; repairing the area outside the safety distance of the built structure by adopting a high-pressure rotary spraying system; adopting well construction injection to repair the built structure in the safety area; the high-pressure rotary spraying system and the well construction are respectively connected with a dissolving tank, and dissolving liquid is provided for the high-pressure rotary spraying system and the well construction injection system through the dissolving tanks. The dissolving liquid is provided for the high-pressure rotary spraying system and the well building injection system through the dissolving tank, and the dissolving liquid is injected into the polluted land block by the high-pressure rotary spraying system and the well building injection system, so that the organic pollutant remediation of the built structure area is realized.
Description
Technical Field
The disclosure relates to the field of environmental remediation, in particular to an in-situ chemical oxidation combined remediation method for land pollution.
Background
As the polluted land in China starts late, the condition that the pollution of peripheral plant areas needs to be repaired is not considered in the urban planning process, so that roads, high-rise buildings and the like are formed around part of the polluted land.
According to the characteristics and risks of the pollutants in the land, heavy metals do not have an exposure way in the built structure area under the conditions that development is not carried out subsequently and underground water does not serve as drinking water, and are mostly repaired in a non-disturbance mode such as risk blocking; however, since the organic pollutants are volatile, the organic pollutants threaten human health, and remediation measures are required to restore the plots.
Therefore, in the area of the built structure, the repair of the organic pollution land needs to ensure that the repair effect reaches the standard while ensuring a certain safe distance from the surrounding structure.
Disclosure of Invention
The embodiment of the invention provides an in-situ chemical oxidation combined remediation method for land pollution.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
an in-situ chemical oxidation combined remediation method for land pollution, which is used for in-situ remediation of organic polluted soil and underground water, and is characterized by comprising the following steps:
determining the area of a land parcel to be repaired and the area of a built structure;
repairing the area outside the safety distance of the built structure by adopting a high-pressure rotary spraying system;
adopting well construction injection to repair the built structure in the safety area;
the high-pressure rotary spraying system and the well construction are respectively connected with a dissolving tank, and dissolving liquid is provided for the high-pressure rotary spraying system and the well construction injection system through the dissolving tanks.
In some embodiments, the dissolving solution is sodium persulfate as an oxidant and sodium hydroxide as an activating agent, and the mixed agent is formed by adding clean water and stirring.
In some embodiments, the repairing of the high-pressure jet grouting system specifically includes: the hollow drill rod is placed in a drill hole, a high-pressure injection pump is started, the mixed medicament conveying pipe conveys the medicament to the hollow drill rod with the nozzle of the high-pressure rotary spraying machine, the grouting pipe with the nozzle is lifted upwards while spraying, and the high-pressure air flow and the high-pressure liquid flow cut and stir the soil body to achieve the purpose of fully mixing the medicament and the soil.
In some embodiments, the hollow drill pipe enters the silty clay layer of the contaminated land after passing through the miscellaneous fill layer of the contaminated land.
In some embodiments, the well construction specifically comprises:
1) drilling: drilling holes by using a drilling machine;
2) and (3) well construction and hole sealing: firstly, putting a well pipe with a sieve seam into a drilled well hole, and covering pipe caps on the upper part and the lower part of the well pipe; pouring quartz sand into the hole, and synchronously shaking the well pipe when the quartz sand is poured into the hole to ensure that the well hole is filled with the quartz sand; pouring bentonite balls into the holes, pouring a proper amount of water into the holes at the same time, and tamping the mixture by using a steel bar; placing the mixed concrete into a well hole for plugging until gaps around the well pipe are fully plugged, finely tamping to the ground height and trowelling the hole opening;
3) and (5) installing equipment, and connecting the well building injection system with the solution tank.
In some embodiments, the well construction injection system comprises a plurality of well pipes, a conveying pipeline for conveying dissolving liquid to the well pipes, and a pneumatic diaphragm injection pump arranged on the conveying pipeline;
and a control valve is arranged on a conveying pipeline for communicating each well pipe, and at least one flowmeter is arranged on the conveying pipeline.
In some embodiments, each of the well pipes is provided with a filling material layer, the peripheral wall of the well pipe is provided with filter seams, and the solution permeates the filling material layer and then permeates the polluted land blocks from the filter seams.
In the present disclosure, at least the following technical effects or advantages are provided:
the embodiment of the invention provides the dissolving liquid for the high-pressure rotary spraying system and the well building injection system through the dissolving tank, and the high-pressure rotary spraying system and the well building injection system inject the dissolving liquid into the polluted land so as to realize the remediation of the organic pollutants in the area of the built structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments of the present invention or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a functional block diagram of a remediation system for remediation of contaminated land provided in accordance with some embodiments of the present disclosure;
FIG. 2 is a schematic view of a high pressure rotary jetting system provided in accordance with some embodiments of the present disclosure;
fig. 3 is a schematic diagram of a well construction injection system provided in accordance with some embodiments of the present disclosure.
Detailed Description
The present disclosure is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present disclosure, and those skilled in the art should understand that the functional, methodological, or structural equivalents of these embodiments or substitutions may be included in the scope of the present disclosure.
In the description of the embodiments of the present disclosure, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, "a plurality" means two or more unless otherwise specified.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Referring to fig. 1, 2 and 3, an embodiment of the present disclosure provides an in-situ chemical oxidation combined remediation method for in-situ contaminated land, including: the system comprises a dissolving tank, a high-pressure rotary spraying system and a well construction injection system; the dissolving tank is communicated with the high-pressure rotary spraying system, the dissolving tank conveys the dissolving liquid to the high-pressure rotary spraying system, and the high-pressure rotary spraying system injects the dissolving liquid into the polluted land; the dissolving tank is communicated with the well construction injection system, the dissolving tank conveys the dissolving liquid to the well construction injection system, and the well construction injection system injects the dissolving liquid into the polluted land parcel; a first valve is arranged on a communication pipeline of the dissolving tank and the high-pressure rotary spraying system, and a second valve is arranged on a communication pipeline of the dissolving tank and the well-building injection system.
The invention adds clean water, oxidizing agent (sodium persulfate) and activating agent (sodium hydroxide) into a dissolving tank according to a certain proportion, adds medicine while stirring to uniformly mix the dissolving liquid in the dissolving tank, the dissolving tank provides the dissolving liquid for a high-pressure rotary spraying system and a well construction injection system, and the high-pressure rotary spraying system and the well construction injection system inject the dissolving liquid into a polluted land.
With reference to fig. 2, the preferred high-pressure rotary spraying system includes a high-pressure rotary spraying machine, a hollow drill rod, a nozzle and a high-pressure drug injection pump, the high-pressure rotary spraying machine is connected to the hollow drill rod, the hollow drill rod is placed in the drilled hole of the contaminated land, the nozzle is installed at the bottom of the hollow drill rod, the dissolving tank and the hollow drill rod are communicated through a first communication pipe, and the high-pressure drug injection pump is installed in the first communication pipe.
Referring to fig. 2, the present invention puts the hollow drill rod into the borehole, starts the high pressure injection pump, and delivers the agent to the hollow drill rod with nozzle of the high pressure rotary sprayer through the mixed agent delivery pipe, and the grouting pipe with nozzle is lifted up while spraying.
Referring to fig. 2, the high-pressure jet grouting system according to the embodiment of the invention is used to repair an area outside the safety area of the built structure. In practical application of the high-pressure rotary spraying system, the air compressor is started firstly, and holes are drilled at the injection point to a preset repairing depth. Before the rotary spraying operation, the rotary spraying pressure, the grouting amount, the spraying direction, the swinging angle and the like are required to be adjusted, so that the medicament is ensured to be smoothly sprayed into the polluted stratum through the slurry conveying pipe. The hollow drill rod is placed in a drill hole, a high-pressure injection pump is started, the mixed medicament conveying pipe conveys the medicament to the hollow drill rod with the nozzle of the high-pressure rotary spraying machine, the grouting pipe with the nozzle is lifted upwards while spraying, and the high-pressure air flow and the high-pressure liquid flow cut and stir the soil body to achieve the purpose of fully mixing the medicament and the soil.
The preferable high-pressure rotary spraying system also comprises an air compressor, and the nozzles comprise air nozzles and grouting nozzles; an air pipeline and a grouting pipeline are arranged in the hollow drill rod, the air pipeline is communicated with an air compressor and an air nozzle, and the grouting pipeline is communicated with the dissolving tank and the grouting nozzle.
Preferably, the hollow drill rod enters the silty clay layer of the contaminated land after penetrating through the miscellaneous fill layer of the contaminated land.
With continued reference to fig. 3, the preferred well construction injection system includes a plurality of well pipes, a delivery pipeline for delivering the dissolving liquid to the well pipes, and a pneumatic diaphragm injection pump disposed in the delivery pipeline; the conveying pipeline is communicated with the dissolving tank; and a control valve is arranged on a conveying pipeline communicated with each well pipe, and at least one flowmeter is arranged on the conveying pipeline.
Continuing with FIG. 3, to ensure the stability of the constructed structure, the well construction injection system is used to repair the constructed structure in the safe area. Drilling: drilling holes with a 150-type drilling machine, wherein the diameter of the drilled holes is 140 mm. And (3) well building and hole sealing: firstly, putting a well pipe with a sieve seam into a drilled well hole, and covering pipe caps on the upper part and the lower part of the well pipe; pouring quartz sand into the hole until the position of 0.5m above the sieve tube, and synchronously shaking the well pipe when the quartz sand is poured to ensure that the well hole is filled with the quartz sand; pouring bentonite balls into the holes, simultaneously pouring a proper amount of water, and tamping by using a steel bar until the hole opening is about 20 cm; and (3) placing the mixed concrete into the well hole for plugging until the gaps around the well pipe are full, finely tamping to the ground height and trowelling the hole opening. Equipment installation: the main equipment is a pneumatic diaphragm injection pump, an oil injection screw air compressor, an air storage tank and a medicament tank. Pipeline connection: connecting the well pipes at all the injection points. The main pipe of the medicine injection pipe adopts a D50mm food-grade U-PVC pipe, the branch pipe adopts a D32U-PVC pipe, and a transparent pipe and a valve are arranged at the position of a well mouth, so that the injection condition of the medicine can be observed conveniently. Testing pressure of the pipeline: and after the pipeline connection is finished, the clean water is firstly used for injection, the wellhead valve is closed, the pressure is adjusted to the maximum, and the pipeline is checked to have the leakage phenomenon. After the rotary spraying injection and the well construction injection of the medicament are finished, the chemical reaction of the medicament and the soil is maintained for 7 to 15 days. After the pressure test of the pipeline, high-pressure rotary spraying and well building injection and injection operations are required, and after the injection is finished, the reaction and oxidation are carried out.
Preferably, each well pipe is internally provided with a filling material layer, the peripheral wall of each well pipe is provided with a filtering seam, and the solution permeates the filling material layer and then permeates the polluted land blocks from the filtering seams.
Preferably, each well pipe enters a silty clay layer of the polluted land after penetrating through a miscellaneous fill layer of the polluted land; the well casing is provided with a plurality of filtering seams on the miscellaneous fill layer and the powdery clay layer respectively.
Preferably, each of the well pipes is inserted into one of the boreholes in the contaminated earth, and the anchoring layer is filled between the well pipes and the boreholes.
The well pipe with the sieve seams is put into a drilled well hole, and pipe caps are covered up and down; the fixed layer comprises quartz sand and bentonite balls, when in actual application, the quartz sand is poured into the well hole until the position of 0.5m above the well pipe, and the well pipe is synchronously shaken when the quartz sand is poured into the well pipe, so that the well hole is ensured to be filled with the quartz sand; pouring bentonite balls into the well hole, simultaneously pouring a proper amount of water, and tamping by using a steel bar until the opening is about 20 cm; and (3) placing the mixed concrete into the well hole for plugging until the gaps around the well pipe are full, finely tamping to the ground height and trowelling the hole opening.
The invention provides a combined medicament dispersing method for in-situ remediation of organic polluted soil and underground water under a polluted land, and ensures the safety of a built structure and the land remediation effect. The well construction injection technology solves the problem of structural instability in the construction process, and the high-pressure rotary spraying technology solves the problems of diffusion and mixing of the pesticide in the cohesive soil.
The above-listed detailed description is merely a specific description of possible embodiments of the present disclosure, and is not intended to limit the scope of the disclosure, which is intended to include within its scope equivalent embodiments or modifications that do not depart from the technical spirit of the present disclosure.
It will be evident to those skilled in the art that the disclosure is not limited to the details of the foregoing illustrative embodiments, and that the present disclosure may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the disclosure being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. An in-situ chemical oxidation combined remediation method for land pollution, which is used for in-situ remediation of organic polluted soil and underground water, and is characterized by comprising the following steps:
determining the area of a land parcel to be repaired and the area of a built structure;
repairing the area outside the safety distance of the built structure by adopting a high-pressure rotary spraying system;
adopting well construction injection to repair the built structure in the safety area;
the high-pressure rotary spraying system and the well construction are respectively connected with a dissolving tank, and dissolving liquid is provided for the high-pressure rotary spraying system and the well construction injection system through the dissolving tanks.
2. The in-situ chemical oxidation combined remediation method for the contaminated land as claimed in claim 1, wherein the dissolving solution is sodium persulfate as the oxidant and sodium hydroxide as the activating agent, and the mixed agent is formed by adding clean water and stirring.
3. The in-situ chemical oxidation combined remediation method for land contamination according to claim 2, wherein the remediation by the high-pressure jet grouting system specifically comprises: the hollow drill rod is placed in a drill hole, a high-pressure injection pump is started, the mixed medicament conveying pipe conveys the medicament to the hollow drill rod with the nozzle of the high-pressure rotary spraying machine, the grouting pipe with the nozzle is lifted upwards while spraying, and the high-pressure air flow and the high-pressure liquid flow cut and stir the soil body to achieve the purpose of fully mixing the medicament and the soil.
4. The in-situ chemical oxidation combined remediation method for contaminated soil as claimed in claim 3, wherein the hollow drill rod enters the silty clay layer of the contaminated soil after passing through the miscellaneous fill layer of the contaminated soil.
5. The in situ chemical oxidation combined remediation method for land contamination according to claim 1, wherein the well construction comprises:
1) drilling: drilling holes by using a drilling machine;
2) and (3) well building and hole sealing: firstly, putting a well pipe with a sieve seam into a drilled well hole, and covering pipe caps on the upper part and the lower part of the well pipe; pouring quartz sand into the hole, and synchronously shaking the well pipe when the quartz sand is poured into the hole to ensure that the well hole is filled with the quartz sand; pouring bentonite balls into the holes, pouring a proper amount of water into the holes at the same time, and tamping the mixture by using a steel bar; placing the mixed concrete into a well hole for plugging until gaps around the well pipe are full, finely tamping to the ground height and trowelling an orifice;
3) and (5) installing equipment, and connecting the well building injection system with the solution tank.
6. The in-situ chemical oxidation combined remediation method for the pollution of the land parcel as claimed in claim 5, wherein the well construction injection system comprises a plurality of well pipes, a delivery pipeline for delivering a dissolving solution to the well pipes, a pneumatic diaphragm injection pump arranged on the delivery pipeline;
and a control valve is arranged on a conveying pipeline for communicating each well pipe, and at least one flowmeter is arranged on the conveying pipeline.
7. The repair system according to claim 6, wherein each of said well pipes is provided with a layer of filler material, and wherein said well pipes are provided with filter slits in a circumferential wall thereof, and wherein the solution penetrates the layer of filler material and then penetrates the contaminated land.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210698266.2A CN115026123A (en) | 2022-06-20 | 2022-06-20 | In-situ chemical oxidation combined remediation method for land pollution |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210698266.2A CN115026123A (en) | 2022-06-20 | 2022-06-20 | In-situ chemical oxidation combined remediation method for land pollution |
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