CN112756388A - Method for repairing underground water by polymer flooding enhanced in-situ chemical oxidation - Google Patents
Method for repairing underground water by polymer flooding enhanced in-situ chemical oxidation Download PDFInfo
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- CN112756388A CN112756388A CN202011483349.7A CN202011483349A CN112756388A CN 112756388 A CN112756388 A CN 112756388A CN 202011483349 A CN202011483349 A CN 202011483349A CN 112756388 A CN112756388 A CN 112756388A
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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
- 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
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention provides a method for repairing underground water by polymer flooding enhanced in-situ chemical oxidation, which comprises the following steps: and injecting the solution containing the hydrolyzed polyacrylamide and the oxidant into the organic polluted underground water, and removing the organic pollutants in the underground water after full reaction. In the invention, the hydrolyzed polyacrylamide is used as a polymer flooding to improve the diffusion capacity of the oxidation medicament between layers with different permeability, form a more uniform forward injection front edge, increase the contact between the co-injection repairing agent and the dispersed pollutants, solve the problems of difficult arrival of the oxidation medicament and difficult removal of organic pollutants in a low permeability layer by the traditional chemical oxidation technology, and provide a new method for in-situ chemical oxidation repair of organic pollutants in a heterogeneous water-containing layer system.
Description
Technical Field
The invention relates to in-situ remediation of underground water, in particular to a method for remedying the underground water by polymer flooding enhanced in-situ chemical oxidation.
Background
With the continuous improvement of global industrialization degree, the living environment on which human lives is continuously destroyed while social economy is continuously developed. Groundwater as an important source of water for human life, industrial water and agricultural irrigation has been seriously polluted, especially organic pollutants, which have high toxicity and durability, seriously threaten the safety of drinking water sources of people, and become a problem of groundwater environmental pollution which is urgently needed to be solved at present.
The in-situ chemical oxidation technology is widely applied to groundwater organic pollution remediation due to the advantages of strong oxidizing free radicals and small disturbance to the stratum, and is one of the most mainstream groundwater remediation methods at present. However, the in-situ chemical oxidation technology also has a plurality of problems, and the oxidizing agent is affected by the difference of soil permeability coefficient and medium type after being injected into the ground, often reaches a high permeability area preferentially and bypasses a low permeability area, so that the problems of insufficient low permeability layer restoration, pollutant rebound after treatment and the like are caused, and the action effect of in-situ chemical oxidation in groundwater restoration is seriously affected.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for repairing underground water by polymer flooding enhanced in-situ chemical oxidation, which utilizes polymer flooding to effectively convey an oxidizing agent potassium permanganate to a heterogeneous aquifer, can better diffuse the oxidizing agent between layers with different permeability, increases the contact probability between the injected repairing agent and the dispersed pollutants, and improves the capability of treating the underground water organic pollutants by the potassium permanganate in-situ chemical oxidation.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to a method for repairing underground water by polymer flooding reinforced in-situ chemical oxidation, which comprises the following steps:
adding the solution A into an underground water injection well for N times, so that the solution A is diffused to an underground water-saturated layer, maintaining for 1-7 days each time, wherein N is more than or equal to 1; the solution A is a solution containing Hydrolyzed Polyacrylamide (HPAM) and an oxidant.
In the present invention, the groundwater is groundwater containing organic pollutants. The organic pollutant is one or more of dichloroethylene, dichloroethane, trichloroethylene, benzene, toluene, 2-chlorobenzene, 4-chlorobenzene and chloroform. Further preferred are mixtures of dichloroethylene, dichloroethane, trichloroethylene.
During the actual operation, the change of the pollutant concentration in the underground saturated water layer is continuously monitored during the maintenance. The end of the groundwater injection well is located inside the groundwater saturated water layer.
The inventor unexpectedly finds that the hydrolyzed polyacrylamide has a polymer flooding effect on the solution containing the oxide, can effectively convey the oxidizing agent potassium permanganate to a heterogeneous aquifer, and can better diffuse the oxidizing agent between layers with different permeability, thereby avoiding the problems of incomplete repair of the low permeability layer, rebound of pollutants after treatment and the like.
Preferably, the degree of hydrolysis of the Hydrolyzed Polyacrylamide (HPAM) is from 30% to 70%.
The Hydrolyzed Polyacrylamide (HPAM) used in the present invention is obtained by hydrolyzing polyacrylamide in a 10% sodium hydroxide solution.
Preferably, the oxidant is potassium permanganate, and the mass fraction of potassium permanganate in the solution a is 1% -10%, preferably 2% -8%, and more preferably 2.5% -5%.
Preferably, in the solution A, the mass fraction of the hydrolyzed polyacrylamide is 1-4%, and preferably 1.5-3%.
In the invention, the more the oxidant is, the better the oxidant is, the concentration of the oxidant potassium permanganate is improved to a certain extent, which is beneficial to the degradation of organic matters, but the excessive oxidant addition has no obvious improvement on the degradation rate of the organic matters, thereby causing the waste of the oxidant. The more hydrolytically hydrolyzed polyacrylamides the better the proper viscosity control will favor the migration of the oxidizing agent in the soil, and too high a viscosity will hinder the diffusion of the oxidizing agent in the soil.
Preferably, the addition amount of the solution A is 8-15% of the volume of the aquifer in the restoration range.
Preferably, the solution A is pumped into an underground water injection well for N times and then is diffused to an underground water-saturated layer, the thickness of the underground water-saturated layer is 5-10 m, and a pressure of 0.02-0.08 MPa is provided in the pumping process.
In actual operation, a mobile infusion device pump is used.
Preferably, N is 2-4.
Further preferably, the underground water injection well is provided at a density of 25 to 100m per unit2One is arranged; further preferably, the thickness is 40-70 m2One underground water injection well is arranged in the underground water injection well, and the single injection amount of any underground water injection well is 2-4 m3。
In the actual operation process, the position of an injection well needs to be determined before injection, and the solution A is injected into the underground by adopting a mobile injection device.
The invention relates to a method for repairing underground water by polymer flooding reinforced in-situ chemical oxidation, which comprises the following steps:
setting underground water injection wells according to the restoration range, wherein the setting density of the underground water injection wells is 40-70 m per minute2One solution A is arranged, the solution A is conveyed into an underground water injection well for 2-4 times by a mobile injection equipment pump and then is diffused to an underground water saturation layer, the thickness of the underground water saturation layer is 5-10 m, and an injection pressure of 0.02-0.04 MPa is provided in the pumping process of the mobile injection equipment; the single injection amount of any one underground water injection well is 2-4 m3And curing for 1-7 days after each injection, wherein the solution A contains 2.5-5% by mass of potassium permanganate and 1.5-3% by mass of hydrolyzed polyacrylamide.
Advantageous effects
Aiming at the in-situ chemical oxidation of organic polluted underground water, the invention adopts a method for repairing underground water by polymer flooding enhanced potassium permanganate in-situ chemical oxidation by utilizing the polymer flooding effect of hydrolyzed polyacrylamide on solution containing oxide, can effectively convey an oxidation reagent potassium permanganate to a heterogeneous water-bearing layer, can better diffuse the oxidation reagent between layers with different permeability, improves the distribution of injection liquid between the oxidation reagent potassium permanganate and the layers with different permeability, increases the contact between co-injected repairing agent and dispersed pollutants, and improves the capability of treating underground water organic pollutants by potassium permanganate in-situ chemical oxidation, thereby avoiding the problems of incomplete repair of low permeability layers, rebound of pollutants after treatment and the like.
Detailed Description
The invention is further illustrated by the following examples:
example 1
And simulating the in-situ chemical oxidation process of the organic polluted underground water in an underground water simulation tank. Selecting three kinds of soil (clay, silt and sandy soil) with different permeabilities, wherein each kind of soil is provided with 3 same underground water simulation tanks A, B and C, each simulation tank is filled with 100 kilograms of soil, and 40L of organic pollution mixed liquor is used for infiltration from the bottom of the simulation tank. The organic contaminated liquid mixture contained 2000. mu.g/L of 1, 2-dichloroethylene and 5000. mu.g/L of toluene.
The underground water simulation tank A is not treated after the organic pollution mixed liquid is added, and sampling detection is carried out immediately after the experiment of the B, C tank is finished.
4L of potassium permanganate solution with the mass fraction of 2.5 percent or 5 percent or 7.5 percent is added into the underground water simulation tank B, injection is carried out for 4 times, the injection amount is 1L each time, the injection is carried out for the second time at intervals of 24 hours after the injection is finished for each time, and sampling detection is carried out after the 4 th injection is finished for 24 hours.
Adding 4L of potassium permanganate with the mass fraction of 2.5% or 5% or 7.5% and hydrolyzed polyacrylamide mixed solution with the mass fraction of 1.5% or 3% into the underground water simulation tank C, injecting for 4 times, wherein the injection amount is 1L each time, injecting for the second time at an interval of 24 hours after the injection for the 4 th time is completed, and sampling and detecting after the injection for the 4 th time is completed for 24 hours.
When 2.5% potassium permanganate solution is added into the tank B and 2.5% potassium permanganate and 1.5% hydrolyzed polyacrylamide mixed solution are added into the tank C, the experimental parameters and results are shown in the following table 1:
TABLE 1
When 2.5% potassium permanganate solution is added into the tank B and 2.5% potassium permanganate and 3% hydrolyzed polyacrylamide mixed solution are added into the tank C, the experimental parameters and results are shown in the following table 2:
TABLE 2
When 5% potassium permanganate solution is added into the tank B and 5% potassium permanganate and 1.5% hydrolyzed polyacrylamide mixed solution are added into the tank C, the experimental parameters and results are shown in the following table 3:
TABLE 3
When 5% potassium permanganate solution is added into the tank B and 5% potassium permanganate and 3% hydrolyzed polyacrylamide mixed solution are added into the tank C, the experimental parameters and results are shown in the following table 4:
TABLE 4
When a 7.5% potassium permanganate solution is added into the tank B and a mixed solution of 7.5% potassium permanganate and 1.5% hydrolyzed polyacrylamide is added into the tank C, the experimental parameters and results are shown in the following table 5:
TABLE 5
When a 7.5% potassium permanganate solution is added into the tank B and a mixed solution of 7.5% potassium permanganate and 3% hydrolyzed polyacrylamide is added into the tank C, the experimental parameters and results are shown in the following table 6:
TABLE 6
The experimental results show that: the more the amount of the oxidant is, the better the oxidant is, the concentration of the oxidant potassium permanganate is improved to a certain degree, which is beneficial to the degradation of the organic matters, but the excessive addition of the oxidant does not obviously improve the degradation rate of the organic matters, so that the waste of the oxidant is caused. The more hydrolytically hydrolyzed polyacrylamides the better the proper viscosity control will favor the migration of the oxidizing agent in the soil, and too high a viscosity will hinder the diffusion of the oxidizing agent in the soil. In the experiment, the mixed reagent of 5 percent potassium permanganate and 1.5 percent hydrolyzed polyacrylamide is found to have the best oxidation effect on the 1, 2-dichloroethylene and the toluene in the tank. The hydrolyzed polyacrylamide polymer flooding can also be found to effectively strengthen the oxidation process of 1, 2-dichloroethylene and toluene by using potassium permanganate as an oxidant, and particularly has obvious effect in the process of simulating and repairing the underground water of the viscous soil with low permeability.
Example 2
For 800m in a chemical field2The organic polluted groundwater area is subjected to in-situ chemical oxidation pilot test, and a water-stopping curtain with the depth of 9m is arranged at the periphery of the area in advance to prevent groundwater at the periphery of the area from invading. The low permeability clay layers were present in the pilot zone, the other layers were higher permeability sands, the aquifer thickness was about 8m, and the average concentrations of 1,2 dichloroethane, 1,2 dichloroethylene, and toluene in the zone were 1520 μ g/L, 2314 μ g/L, and 2139 μ g/L. And (3) carrying out grid scribing on an experimental site before in-situ chemical oxidation injection, and uniformly arranging 13 underground water injection wells.And pumping the repairing agent to a groundwater injection well by adopting mobile injection equipment, wherein the delivery pressure is 0.04 MPa. Injecting 5 mass percent of potassium permanganate and 1.5 mass percent of hydrolyzed polyacrylamide mixed solution into each well for 6m3Injecting the mixture in two times, wherein each time of the injection is 2m3And 3 rounds of co-injection are carried out, the injection of the first round is carried out, the injection of the second round is carried out at an interval of 3 days, and the sampling detection is carried out on the 7 th day after the injection of the second round is finished. The detection result shows that the average concentration of 1, 2-dichloroethane, 1, 2-dichloroethylene and toluene in the low-permeability clay layer after the polymer flooding in-situ chemical oxidation mediated by the hydrolyzed polyacrylamide is 117 mug/L, 135 mug/L and 312 mug/L, and the average concentration of 1, 2-dichloroethylene, 1, 2-dichloroethylene and toluene in the sandy soil layer with higher permeability is 98 mug/L, 115 mug/L and 243 mug/L.
Obviously, the treatment effects of the polymer flooding in-situ chemical oxidation process mediated by the hydrolyzed polyacrylamide on the low-permeability clay layer and the sandy soil layer with higher permeability are not greatly different.
Claims (10)
1. A method for repairing underground water by polymer flooding reinforced in-situ chemical oxidation is characterized by comprising the following steps: the method comprises the following steps:
adding the solution A into an underground water injection well for N times, so that the solution A is diffused to an underground water-saturated layer, maintaining for 1-7 days each time, wherein N is more than or equal to 1; the solution A is a solution containing hydrolyzed polyacrylamide and an oxidant.
2. The method for repairing underground water by polymer flooding enhanced in-situ chemical oxidation according to claim 1, characterized by comprising the following steps: the hydrolysis degree of the hydrolyzed polyacrylamide is 30-70%.
3. The method for repairing underground water by polymer flooding enhanced in-situ chemical oxidation according to claim 1, characterized by comprising the following steps: the oxidant is potassium permanganate, and the mass fraction of the oxidant in the solution A is 1-10%.
4. The method for repairing underground water by polymer flooding enhanced in-situ chemical oxidation according to claim 3, characterized in that: in the solution A, the mass fraction of the oxidant is 2-8%.
5. The method for repairing underground water by polymer flooding enhanced in-situ chemical oxidation according to claim 1, characterized by comprising the following steps: in the solution A, the mass fraction of the hydrolyzed polyacrylamide is 1-4%.
6. The method for repairing underground water by polymer flooding enhanced in-situ chemical oxidation according to claim 1, characterized by comprising the following steps: the addition amount of the solution A is 8-15% of the volume of the aquifer in the restoration range.
7. The method for repairing underground water by polymer flooding enhanced in-situ chemical oxidation according to claim 1, characterized by comprising the following steps: and pumping the solution A into a groundwater injection well for N times and then diffusing the solution A into a groundwater saturated layer, wherein the thickness of the groundwater saturated layer is 5-10 m, and a pressure of 0.02-0.08 MPa is provided in the pumping process.
8. The method for repairing underground water by polymer flooding enhanced in-situ chemical oxidation according to claim 1 or 7, wherein the method comprises the following steps: and N is 2-4.
9. The method for repairing underground water by polymer flooding enhanced in-situ chemical oxidation according to claim 1 or 7, wherein the method comprises the following steps: the setting density of the underground water injection well is 25-100 m per second2One underground water injection well is arranged in the underground water injection well, and the single injection amount of any underground water injection well is 2-4 m3。
10. The method for repairing underground water by polymer flooding enhanced in-situ chemical oxidation according to any one of claims 1 to 7, wherein: the method comprises the following steps: setting underground water injection wells according to the restoration range, wherein the setting density of the underground water injection wells is 40-70 m per minute2One is arranged in the device, and the solution A is sent to the ground for 2 to 4 times by adopting a mobile injection equipment pumpThe underground water is diffused to an underground water-saturated layer after being injected into the well, the thickness of the underground water-saturated layer is 5-10 m, and the injection pressure of 0.02-0.04 MPa is provided in the pumping process of the mobile injection equipment; the single injection amount of any one underground water injection well is 2-4 m3And curing for 1-7% after each injection, wherein the solution A contains 2.5-5% by mass of potassium permanganate and 1.5-3% by mass of hydrolyzed polyacrylamide.
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