CN111420976A - Underground water in-situ chemical remediation medicament optimized injection system - Google Patents
Underground water in-situ chemical remediation medicament optimized injection system Download PDFInfo
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- CN111420976A CN111420976A CN202010318670.3A CN202010318670A CN111420976A CN 111420976 A CN111420976 A CN 111420976A CN 202010318670 A CN202010318670 A CN 202010318670A CN 111420976 A CN111420976 A CN 111420976A
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- 238000002347 injection Methods 0.000 title claims abstract description 155
- 239000007924 injection Substances 0.000 title claims abstract description 155
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 238000005067 remediation Methods 0.000 title claims abstract description 56
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 34
- 239000000126 substance Substances 0.000 title claims abstract description 32
- 239000003814 drug Substances 0.000 title abstract description 66
- 239000007788 liquid Substances 0.000 claims abstract description 51
- 230000003068 static effect Effects 0.000 claims abstract description 34
- 238000012544 monitoring process Methods 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 33
- 239000003673 groundwater Substances 0.000 claims description 28
- 239000004927 clay Substances 0.000 claims description 8
- 238000004886 process control Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 15
- 238000006243 chemical reaction Methods 0.000 description 13
- 239000003344 environmental pollutant Substances 0.000 description 13
- 231100000719 pollutant Toxicity 0.000 description 13
- 230000008439 repair process Effects 0.000 description 13
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical group NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical group ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 5
- 229960001701 chloroform Drugs 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 4
- UBOXGVDOUJQMTN-UHFFFAOYSA-N 1,1,2-trichloroethane Chemical compound ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 3
- SCYULBFZEHDVBN-UHFFFAOYSA-N 1,1-Dichloroethane Chemical compound CC(Cl)Cl SCYULBFZEHDVBN-UHFFFAOYSA-N 0.000 description 3
- 238000009933 burial Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 238000006276 transfer reaction Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 239000003403 water pollutant Substances 0.000 description 1
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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
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Processing Of Solid Wastes (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses an underground water in-situ chemical remediation medicament optimized injection system, which comprises a remediation medicament injection device, an underground water monitoring well and a remediation medicament injection control system, wherein the remediation medicament injection device consists of a medicament injection tank and a medicament injection well, an input water quality sensor is arranged in the underground water monitoring well, the remediation medicament injection control system comprises a variable frequency pump, a frequency converter, an electromagnetic flowmeter, an input static pressure liquid level meter and a P L C controller, the input static pressure liquid level meter is arranged in the medicament injection well, the variable frequency pump and the electromagnetic flowmeter are arranged on a medicament injection pipeline, and the frequency converter, the electromagnetic flowmeter, the input static pressure liquid level meter and the input water quality sensor are all in circuit connection with the P L C controller.
Description
Technical Field
The invention relates to the technical field of underground water in-situ remediation, in particular to an underground water in-situ chemical remediation medicament optimized injection system.
Background
In the fast development period of groundwater pollution remediation and prevention, various groundwater remediation technologies, such as in-situ chemical remediation technology, permeable reactive barrier, bioremediation technology, natural attenuation monitoring technology and the like, are gradually applied to practical engineering. The in-situ chemical oxidation technology is a technology for transforming pollutants in underground water into nontoxic or low-toxic substances by injecting a repairing medicament into an underground water polluted area and through the oxidation or reduction of the medicament. Compared with other repairing technologies, the technology only needs to inject the repairing agent into the groundwater aquifer through the injection well, the cost is relatively low, the chemical reaction speed is high, the strength is high, the time for degrading pollutants is relatively short, and the problem of pollution of deep groundwater in a polluted site can be solved.
At present, the underground water in-situ chemical oxidation technology has two key technical problems to be solved. Firstly, the hydrogeological conditions of a polluted site are limited, the permeability coefficient of a water-bearing stratum of the site is small, and the in-situ chemical remediation technology has the defects of low medicament injection speed, long period, easiness in slurry return and the like. Secondly, the mass transfer and chemical reaction conditions of underground water pollutants are complex, the pollutant degradation effect is ensured by adopting a scheme of excessive injection of a medicament, but the operation cost is high and the medicament residue is high. Therefore, it is necessary to optimize and develop an injection system of the in-situ chemical remediation agent for groundwater, and dynamically controllable in-situ chemical remediation is realized by stably controllable agent injection, so that ineffective and excessive injection of the agent is reduced, and the economic practicability of the in-situ chemical remediation technology for groundwater is improved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an optimized injection system of a chemical remediation agent for in-situ groundwater, which can enable the in-situ remediation agent to be continuously injected into a groundwater aquifer, improve the injection efficiency, reduce the injection amount, shorten the remediation period, reduce the remediation cost and completely avoid the probability of secondary pollution caused by the slurry return of an injection well and excessive injection.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to an underground water in-situ chemical remediation agent optimized injection system which comprises a remediation agent injection device, an underground water monitoring well and a remediation agent injection control system, wherein the remediation agent injection device comprises an injection tank and an injection well, the injection tank and the injection well are connected through an injection pipeline, an input water quality sensor is arranged in the underground water monitoring well, the remediation agent injection control system comprises a frequency conversion pump, a frequency converter, an electromagnetic flowmeter, an input static pressure liquid level meter and a P L C controller, the input static pressure liquid level meter is arranged in the injection well, the frequency conversion pump and the electromagnetic flowmeter are arranged on the injection pipeline, the frequency conversion pump is controlled by the frequency converter in terms of the running frequency, the frequency converter, the electromagnetic flowmeter, the input static pressure liquid level meter and the input water quality sensor are all in circuit connection with the P L C controller, the P L C controller evaluates an in-situ remediation process according to a preset liquid level value of the input static pressure liquid level meter, a preset pH value, an ORP and an electric conductivity value set by the input water quality sensor, and controls the running frequency converter to realize adjustment of the injection rate and the injection end point of the injection.
The side edge of the injection well is provided with small circulation holes communicated with a groundwater aquifer.
The injection well sequentially penetrates through a clay layer, a gravel layer and a mudstone layer from the ground surface to the bottom, and the input type static pressure liquid level meter is input to the bottom of the injection well from a well mouth of the injection well.
The repair agent optimized injection system has the following beneficial effects:
1) the groundwater in-situ chemical remediation agent optimizing injection system can enable remediation agents to be continuously injected into a groundwater aquifer, and shortens the agent injection time and the remediation construction period.
2) The underground water in-situ chemical remediation agent optimizing injection system can dynamically adjust the injection end point according to underground pH, ORP and conductivity, maintain the optimal in-situ chemical reaction condition, improve the agent utilization rate and reduce the remediation cost.
3) By utilizing the repairing agent optimized injection system, the phenomenon of slurry return during injection can be completely avoided, the safety in the in-situ chemical repairing process of underground water is improved, and the repairing cost can be saved.
Drawings
Fig. 1 is a schematic structural diagram of an underground water in-situ chemical remediation agent optimized injection system of the invention.
In the figure, 1-a medicine injection tank, 2-a stirrer, 3-a medicine injection pipeline, 4-a control valve, 5-a variable frequency pump, 6-a frequency converter, 7-an electromagnetic flowmeter, 8-a medicine injection well, 9-P L C controller, 10-a throwing type static pressure liquid level meter, 11-a variable frequency pump power line, 12-a stirrer control circuit, 13-a frequency converter control circuit, 14-an underground water monitoring well, 15-a throwing type water quality sensor, 16-a clay layer, 17-a round gravel layer and 18-a mudstone layer.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
as shown in figure 1, the underground water in-situ chemical remediation medicament optimizing injection system comprises a remediation medicament injection device, an underground water monitoring well 14 and a remediation medicament injection control system, wherein the remediation medicament injection device comprises a medicament injection tank 1 and a medicament injection well 8, a stirrer 2 is installed on the medicament injection tank 1, remediation medicaments in the medicament injection tank 1 can be uniformly stirred, the medicament injection tank 1 and the medicament injection well 8 are connected through a medicament injection pipeline 3, the medicament injection well 8 sequentially penetrates through a clay layer 16, a gravel layer 17 and a mudstone layer 18 from the ground surface downwards, the medicament injection pipeline 3 extends into the bottom of the medicament injection well 8, an injection type static pressure liquid level meter 10 is installed in the medicament injection well 8, an injection type water quality sensor 15 is arranged in the underground water monitoring well 14, the remediation medicament injection control system comprises a frequency converter 5, a frequency converter 6, an electromagnetic flow meter 7, an injection type static pressure liquid level meter 10, a P L C controller 9, the frequency converter 5 and the electromagnetic flow meter 7 are installed on the medicament injection pipeline 3, the frequency converter 6 controls the running frequency converter 6, the water quality flow rate, the injection type static pressure liquid level meter 10, the injection controller 10, the frequency converter 6 is connected with a frequency converter 12, a water quality control circuit, a water injection controller 12, a water injection controller 13 is connected with a frequency controller, a frequency controller 12, a frequency controller 3, a frequency controller for controlling the injection type static pressure liquid level meter 6 and a process control circuit for controlling the injection pump 13, a process of the injection type conductivity meter 13, a water quality meter 6 and a frequency controller for controlling the injection type conductivity meter 13, a water injection pump for realizing the injection type conductivity meter 13, and a pre-injection pump 13.
And a control valve 4 is arranged on the medicine injection pipeline 1 and can control the repairing agent to flow out of the medicine injection tank 1.
And the side edge of the medicine injection well 8 is provided with a small circulation hole communicated with a groundwater aquifer.
According to the invention, the P L C controller 9 controls the frequency converter 6 to form frequency conversion interlocking with the liquid level in the injection well 8, when the liquid level in the injection well 8 is higher than the set value of the drop-in static pressure type liquid level meter 10, and the injection flow is overlarge, the frequency of the frequency converter 6 is reduced, the running power of the frequency conversion pump 5 is reduced, and the injection flow is reduced until the liquid level in the injection well 8 is equal to the set value of the drop-in static pressure type liquid level meter 10, so that the constant liquid level in the injection well 8 is maintained.
According to the invention, the P L C controller is used for controlling the frequency converter 6 and the pH value, ORP value and conductivity value in the monitoring well 14 to form frequency conversion interlocking, if the indexes of pH, ORP, conductivity and the like of underground water are continuously monitored to show that pollutants in the underground water in the area meet the level of chemical in-situ remediation completion, the frequency conversion pump 5 stops working when the chemical injection end point is reached, and if the indexes of pH, ORP, DO, conductivity and the like of underground water in the subsequent monitoring period show that pollutants in the underground water in the area rebound, the frequency conversion pump 5 is restarted until the underground water in the area is repaired.
The method for optimizing the injection system by applying the underground water in-situ chemical remediation agent comprises the following steps:
(1) feeding the solid medicament into the medicament injection tank 1; the solid medicament includes but is not limited to oxidizing medicaments such as persulfate, permanganate and the like, and includes but is not limited to reducing medicaments such as sodium hydrosulfite, zero-valent iron, ferrous sulfate and the like;
(2) adding water into the medicine injection tank 1, starting the stirrer 2, and stirring to prepare a repairing medicament solution with a required concentration, wherein the stirring speed of the stirrer is 50-70 r/min;
(3) and (3) sequentially starting the control valve, the variable frequency pump, the frequency converter, the electromagnetic flowmeter, the throw-in type static pressure liquid level meter and the throw-in type water quality sensor, and injecting the prepared repairing agent solution into the injection well 10 until the underground water in-situ repairing operation is completed.
(4) The P L C controller sets a target value of a drop-in type static pressure liquid level meter 10, and sets the variable frequency interlock of the liquid level in the injection well 10 and the variable frequency pump, so that the running frequency of the variable frequency pump is automatically controlled along with the liquid level in the injection well to keep the liquid level in the injection well constant.
(5) The P L C controller controls the frequency converter 6 and the pH, ORP and conductivity levels in the monitoring well 14 to form start-stop interlocking, and if indexes such as pH, ORP, DO and conductivity of underground water are continuously monitored to show that pollutants in the underground water in the area meet the level of chemical in-situ remediation completion, the chemical injection end point is reached, and the frequency conversion pump 5 stops working.
The following is an application example of the groundwater in-situ chemical remediation medicament optimized injection system of the invention:
example 1:
the project is a groundwater remediation project of a certain chemical plant in the southwest, and the groundwater remediation area is 24.7 thousands of the same. The field has two layers of silty clay, the water-bearing layer is a round gravel layer, the average water level is buried deep by 15m, and the thickness of the water-bearing layer is 14-20 m. The target pollutants in the groundwater are organic matters such as 1, 1-dichloroethane, trichloromethane and the like, the initial value of the water quality is pH 4.41, the ORP is 102mV, and the conductivity is 32 mus/cm. The repair technology adopts the system of the invention, and the used oxidizing agent is sodium persulfate. Adding solid sodium persulfate into the medicine injection tank, adding water, and starting a stirrer to prepare the mixture with the mass concentration of 100kg/m3The stirring speed of the stirrer is 50r/min, the target value of the throw-in type static pressure liquid level meter is set to be 25m through a P L C control box, and the liquid level in the injection well and the variable frequency interlock of the variable frequency pump are set to changeThe operation frequency of the frequency pump is automatically controlled along with the liquid level in the injection well, and the control valve, the frequency conversion pump, the frequency converter, the electromagnetic flowmeter, the throw-in type static pressure liquid level meter and the throw-in type water quality sensor are sequentially started, so that the prepared repairing agent solution is injected into the injection well. The reading of the electromagnetic flowmeter in the process of injecting the medicine is between 0.5 and 2m3The actual value of a throwing type static pressure liquid level meter in the injection well fluctuates between 24.8 and 25.1m when the pressure changes per hour, the repairing agent is continuously injected into the injection well, the phenomenon of back grouting is not found, and the daily injection dosage is improved by 160 to 215 percent. And (4) according to indexes such as pH, ORP, conductivity and the like monitored by the drop-in water quality sensor in the monitoring well, displaying that the pollutants in the groundwater in the area meet the requirement of chemical in-situ remediation completion. After the repair is finished, the removal rate of the 1, 1-dichloroethane is 99.1%, the removal rate of the trichloromethane is 100%, and the repair target is achieved.
Example 2:
the project is a groundwater remediation project of a certain chemical plant in the southwest, and the groundwater remediation area is 24.7 thousands of the same. The ground has two layers of silty clay, the aquifer is a round gravel layer, the average water level burial depth is 15m, and the thickness of the aquifer is 14-20 m. The target pollutants in the groundwater are organic matters such as chloroethylene, 1, 2-dichloroethane and the like. The initial values of water quality were pH 5.71, ORP 65mV, and conductivity 98.7. mu.s/cm. The repair technology adopts the system of the invention, and the used oxidizing agent is sodium persulfate. Adding solid sodium persulfate into the medicine injection tank, adding water, and starting a stirrer to prepare the mixture with the mass concentration of 80kg/m3The stirring speed of the stirrer is 60r/min, the target value of the throw-in type static pressure liquid level meter is set to be 24m through a P L C control box, the liquid level in the injection well and the variable frequency interlock of a variable frequency pump are set, the operating frequency of the variable frequency pump is automatically controlled along with the liquid level in the injection well, a control valve, the variable frequency pump, the variable frequency device, the electromagnetic flowmeter, the throw-in type static pressure liquid level meter and a throw-in type water quality sensor are sequentially opened, the prepared repairing medicament solution is injected into the injection well, the reading of the electromagnetic flowmeter is 0.5-1.7 m in the medicament injection process3The actual value of a throwing type static pressure liquid level meter in the injection well fluctuates at 23.6-24.1 m by the change of the/h, the repairing agent is continuously injected into the injection well, the phenomenon of back grouting is not found, and the daily injection dosage is improved by 105-146%. According to the monitoring of the water quality sensor thrown into the monitoring wellThe indexes of pH, ORP, conductivity and the like show that the pollutants in the groundwater in the area meet the requirement of chemical in-situ remediation completion. After the repair is finished, the removal rate of the chloroethylene is 100 percent, and the removal rate of the trichloromethane is 87.6 percent, so that the repair target is achieved.
Example 3:
the project is a groundwater remediation project of a certain mechanical plant site, and the remediation area is about 60 mu. The ground stratum is a gravel layer comprising miscellaneous fill, clay and a water-bearing layer from top to bottom, the water level burial depth is 4-7 m, and the thickness of the water-bearing layer is about 2-4 m. The groundwater in the original site is polluted by carbon tetrachloride, chloroethylene and trichloromethane. The initial value of the water quality was pH 5.77, ORP 88mV and conductivity 79.1. mu.s/cm. The repair technology adopts the system of the invention, and the used oxidizing agent is sodium persulfate. Adding solid sodium persulfate into the medicine injection tank, adding water, and starting a stirrer to prepare the mixture with the mass concentration of 50kg/m3Setting the target value of a throw-in type static pressure liquid level meter to be 7m through a P L C control box, setting the liquid level in a medicine injection well and the variable frequency interlock of a variable frequency pump, automatically controlling the running frequency of the variable frequency pump along with the liquid level in the medicine injection well, sequentially opening a control valve, the variable frequency pump, a frequency converter, an electromagnetic flowmeter, a throw-in type static pressure liquid level meter and a throw-in type water quality sensor, and injecting the prepared repairing medicament solution into the medicine injection well, wherein the reading of the electromagnetic flowmeter is 0.3-1.2 m in the medicine injection process3The actual value of a throwing type static pressure liquid level meter in the injection well fluctuates within 6.7-7.2 m when the pressure changes per hour, the repairing agent is continuously injected into the injection well, the phenomenon of back grouting is not found, and the daily injection dosage is improved by 70-120%. And (4) according to indexes such as pH, ORP, conductivity and the like monitored by the drop-in water quality sensor in the monitoring well, displaying that the pollutants in the groundwater in the area meet the requirement of chemical in-situ remediation completion. After the repair is finished, the removal rate of carbon tetrachloride is 95.3%, the removal rate of chloroethylene is 100%, and the removal rate of trichloromethane is 89.7%, which all achieve the repair target.
Example 4:
the project is a groundwater remediation project of an organic pollution site in Guangxi, and the amount of the groundwater remediation project is 20 ten thousand cubic meters. The ground has one layer of silty clay and water-bearing layer as round gravel layer, and the underground water is buried shallowly and averagelyThe water level burial depth is 4-6 m, and the thickness of the water-containing layer is 8-20 m. The target pollutants in the groundwater are chlorohydrocarbon organic matters such as chloroethylene, 1, 2-trichloroethane, 1-dichloroethane and the like. The initial value of the water quality was pH 4.77, ORP 45mV and conductivity 13.9. mu.s/cm. The repair technology adopts the system of the invention, and the used oxidizing agent is sodium persulfate. Adding solid sodium persulfate into the medicine injection tank, adding water, and starting a stirrer to prepare the mixture with the mass concentration of 80kg/m3Setting the target value of a throw-in type static pressure liquid level meter to be 20m through a P L C control box, setting the liquid level in a medicine injection well and the variable frequency interlock of a variable frequency pump, automatically controlling the running frequency of the variable frequency pump along with the liquid level in the medicine injection well, sequentially opening a control valve, the variable frequency pump, a frequency converter, an electromagnetic flowmeter, a throw-in type static pressure liquid level meter and a throw-in type water quality sensor, and injecting the prepared repairing medicament solution into the medicine injection well, wherein the reading of the electromagnetic flowmeter is 0.5-1.3 m in the medicine injection process3The actual value of a throwing type static pressure liquid level meter in the injection well fluctuates within 19.7-21.0 m when the pressure changes per hour, the repairing agent is continuously injected into the injection well, the phenomenon of back grouting is not found, and the daily injection dosage is improved by 85-135%. And (4) according to indexes such as pH, ORP, conductivity and the like monitored by the drop-in water quality sensor in the monitoring well, displaying that the pollutants in the groundwater in the area meet the requirement of chemical in-situ remediation completion. After the repair is finished, the removal rate of the chloroethylene is 99.2%, the removal rate of the 1,1, 2-trichloroethane is 91.5%, and the removal rate of the 1, 1-dichloroethane is 94.7%, all of which reach the repair target.
The above description is only a preferred embodiment of the present invention, and these embodiments are based on different implementations of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. The system is characterized by comprising a repairing agent injection device, an underground water monitoring well and a repairing agent injection control system, wherein the repairing agent injection device comprises an injection tank and an injection well, the injection tank and the injection well are connected through an injection pipeline, a drop-in water quality sensor is arranged in the underground water monitoring well, the repairing agent injection control system comprises a variable frequency pump, a frequency converter, an electromagnetic flowmeter, a drop-in static pressure liquid level meter and a P L C controller, the drop-in static pressure liquid level meter is arranged in the injection well, the variable frequency pump and the electromagnetic flowmeter are arranged on the injection pipeline, the variable frequency pump is controlled by the frequency converter in operation frequency, the frequency converter, the electromagnetic flowmeter, the drop-in static pressure liquid level meter and the drop-in water quality sensor are all in circuit connection with the P L C controller, the P L C controller evaluates an in-situ repairing process control frequency converter according to a preset liquid level value of the drop-in static pressure liquid level meter, a pH value, an ORP and an injection conductivity value of the drop-in water quality sensor, and controls the operation frequency and the start-stop action of the variable frequency injection pump to adjust the injection rate and the end point of the injection.
2. The system for optimizing injection of in-situ chemical remediation agents of claim 1, wherein the lateral side of the injection well is provided with small flow holes communicating with an aquifer of groundwater.
3. The system for optimizing injection of in-situ chemical remediation agents of underground water as claimed in claim 1 or claim 2, wherein the injection well sequentially penetrates through the clay layer, the gravel layer and the mudstone layer from the ground surface to the bottom, and the drop-in static pressure liquid level meter is dropped from a wellhead of the injection well to the bottom of the injection well.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113354191A (en) * | 2021-05-24 | 2021-09-07 | 重庆市环境保护工程设计研究院有限公司 | Mine water burst comprehensive treatment control system and method |
| CN115893552A (en) * | 2023-03-01 | 2023-04-04 | 宝航环境修复有限公司 | Groundwater normal position circulation prosthetic devices |
| CN116037639A (en) * | 2023-01-31 | 2023-05-02 | 江苏省环境科学研究院 | Drip irrigation type automatic injection process and device for in-situ restoration agent of soil and underground water |
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| CA2084227A1 (en) * | 1991-12-20 | 1993-06-21 | John F. Dablow, Iii | Recoverable extraction and injection probe for enhanced gradient remediation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113354191A (en) * | 2021-05-24 | 2021-09-07 | 重庆市环境保护工程设计研究院有限公司 | Mine water burst comprehensive treatment control system and method |
| CN116037639A (en) * | 2023-01-31 | 2023-05-02 | 江苏省环境科学研究院 | Drip irrigation type automatic injection process and device for in-situ restoration agent of soil and underground water |
| CN116037639B (en) * | 2023-01-31 | 2023-10-03 | 江苏省环境科学研究院 | Drip irrigation type automatic injection process and device for in-situ restoration agent of soil and underground water |
| CN115893552A (en) * | 2023-03-01 | 2023-04-04 | 宝航环境修复有限公司 | Groundwater normal position circulation prosthetic devices |
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