CN114074112A - Soil remediation system and method for contaminated site - Google Patents
Soil remediation system and method for contaminated site Download PDFInfo
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- CN114074112A CN114074112A CN202010820497.7A CN202010820497A CN114074112A CN 114074112 A CN114074112 A CN 114074112A CN 202010820497 A CN202010820497 A CN 202010820497A CN 114074112 A CN114074112 A CN 114074112A
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- 239000002689 soil Substances 0.000 title claims abstract description 56
- 238000005067 remediation Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000002347 injection Methods 0.000 claims abstract description 89
- 239000007924 injection Substances 0.000 claims abstract description 89
- 239000003814 drug Substances 0.000 claims abstract description 88
- 239000007788 liquid Substances 0.000 claims abstract description 69
- 238000001514 detection method Methods 0.000 claims abstract description 58
- 239000000126 substance Substances 0.000 claims abstract description 39
- 238000003860 storage Methods 0.000 claims abstract description 23
- 230000008439 repair process Effects 0.000 claims abstract description 8
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 42
- 239000000243 solution Substances 0.000 claims description 29
- 229940079593 drug Drugs 0.000 claims description 21
- 239000002253 acid Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 239000003513 alkali Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 9
- 229910000859 α-Fe Inorganic materials 0.000 claims description 7
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 4
- 239000013505 freshwater Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000007865 diluting Methods 0.000 claims description 2
- 239000002585 base Substances 0.000 claims 1
- 239000000575 pesticide Substances 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- 239000007800 oxidant agent Substances 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
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- 238000004458 analytical method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
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- 239000003673 groundwater Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 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 description 1
- 239000012028 Fenton's reagent Substances 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011835 investigation 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
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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- 238000007725 thermal activation Methods 0.000 description 1
- 230000000007 visual effect Effects 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
- B09C1/002—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
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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)
Abstract
The application provides a soil repair system and method for polluting place, pollute the place and be provided with a plurality of injection wells and detection well, the detection well closes on the injection well sets up, soil repair system includes: the detection device is buried in the detection well and used for detecting the physical and chemical indexes of the soil in real time, wherein the physical and chemical indexes are at least one of pH value, conductivity, potential value and temperature; the medicine injection device is communicated with the medicine injection well through a pipeline and comprises a liquid medicine storage tank and a medicine injection pump; and the control device receives the detection signal of the detection device and controls the medicine injection device to work after judgment. The soil remediation system for the contaminated site can monitor the physical and chemical indexes of soil in real time, and realizes accurate pesticide injection of the pesticide injection system through centralized processing of the control system.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a soil remediation system and method for a polluted site.
Background
The soil in-situ remediation technology mainly comprises three types of physical remediation, chemical remediation and biological remediation, wherein the physical remediation refers to heating a soil layer (such as introducing hot steam) to volatilize internal pollutants, and the internal pollutants are extracted, collected and further treated; chemical remediation refers to injecting chemical agents (particularly oxidizing agents) into the soil layer, and oxidizing and decomposing pollutants into small molecular substances by using the chemical agents; the bioremediation is to plant specific plants in a polluted site and absorb pollutants, such as heavy metals and the like, in a soil layer by utilizing biological enrichment.
The in-situ chemical oxidation remediation technology is the most important method for soil chemical remediation, and the Fenton method is representative of the technology. The in-situ chemical oxidation remediation technology has obvious advantages, the polluted soil is not required to be completely excavated, only the wells are drilled at different depths of a polluted area, the oxidant is injected into the soil, and the pollutants are degraded or caused to change in form through mixing and reaction of the oxidant and the pollutants. However, since the contaminated soil is deep in the stratum, the content and treatment state of the contaminants cannot be known in time, and the injected medicament can only be determined by experience, the amount of the injected medicament is too much or too little.
If CN206325942U discloses a pollute soil and groundwater prosthetic devices, including medicament agitator tank and pneumatic pump, inject into the injection well through the air pump with the medicament during restoration, set up the detection well on injection well edge in addition, through detecting the quality of water of underground groundwater in the detection well, judge the treatment effect. The repairing device has the same problem that the injected medicament amount is blind, and the problems of secondary pollution or incomplete repairing are easily caused.
Disclosure of Invention
The invention provides a soil remediation system for a polluted site, which can monitor the physical and chemical indexes of soil in real time, accurately and automatically control the injection amount of a medicament, avoid the problems of secondary pollution or incomplete remediation, simultaneously accurately control the temperature of oxidized soil, and solve the potential safety hazards of well spraying, high-temperature explosion and the like in the medicament injection process.
The utility model provides a soil repair system for polluting place, pollute the place and be provided with a plurality of injection wells and detection well, detection well with the injection one-to-one sets up, and closes on the injection well, soil repair system includes:
the detection device is buried in the detection well and used for detecting the physical and chemical indexes of the soil in real time, wherein the physical and chemical indexes are at least one of pH value, conductivity, potential value and temperature;
the medicine injection device is communicated with the medicine injection well through a pipeline and comprises a liquid medicine storage tank and a medicine injection pump;
and the control device receives the detection signal of the detection device and controls the medicine injection device to work after judgment.
The reagent generally has the pH value with the optimal reaction, taking Fenton oxidation as an example, the pH value with the optimal reaction is 3-5, and when the soil reaches the pH value, hydrogen peroxide is injected, so that the optimal reaction efficiency can be achieved, and the hydrogen peroxide is optimally utilized. After the fenton reaction was completed, the pH was measured to control the amount of alkali added.
The potential value is used for controlling the addition amount of the hydrogen peroxide, for example, the preset potential value is 500mv, and after the hydrogen peroxide is added, the control valve of the hydrogen peroxide is automatically closed when the potential value rises to 500 mv. After the reaction is finished, the condition of the oxidation reaction can be fed back through potential value detection.
The partial oxidant has the best reaction temperature, and is mainly used for thermal activation control, for example, the best action temperature of sodium persulfate is about 40 degrees, and the best temperature of Fenton reaction is also about 40 degrees, through temperature detection, can know the reaction condition of soil, simultaneously according to the temperature field, can react the inside flow condition of soil of medicament, to the oxidation reaction of hazardous waste, through the temperature detection net, can avoid underground explosion.
Resistance detection is mainly used for detecting underground pollutants, the resistance of the resistance net can be changed by the flowing of the medicament in soil, and the part of soil which is subjected to short flow or obstruction can be found according to the change of the resistance.
Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.
Optionally, the drug injection device comprises a mixer communicated with the plurality of drug solution storage tanks, and the mixer is further connected with a clear water source.
Optionally, the mixer is formed by connecting a plurality of tubular mixers in series, and a single tubular mixer is connected with a liquid medicine storage tank through a pipeline.
Optionally, a metering pump is arranged on a pipeline of the liquid medicine storage tank connected with the mixer.
Optionally, the liquid medicine storage tank is connected with the mixer through two parallel pipelines, one of the pipelines is a normal working pipeline, and the other pipeline is a standby pipeline.
Optionally, the liquid medicine storage tank is connected with the mixer through two parallel pipelines, one of the pipelines is a normal working pipeline, and the other pipeline is a standby pipeline.
Optionally, a self-priming pump is arranged on a pipeline of the mixer connected with the clear water source.
Optionally, a return pipe is arranged on the liquid medicine storage tank, and a pressure release valve is arranged on the return pipe.
Optionally, the liquid medicine storage tank includes a ferrite solution tank, a hydrogen peroxide tank, an acid solution tank and an alkali solution tank.
Optionally, the detection device is at least one of a pH meter, a conductivity meter, a thermometer, or a potentiometer.
Optionally, the control device is a PLC controller.
The invention also provides a method for repairing soil by using the soil repairing system, which comprises the following steps:
mixing and diluting the acid liquor, injecting the diluted acid liquor into a medicine injection well, detecting the pH value in the detection well in real time, and stopping injecting the acid liquor until the pH value reaches a first set value;
injecting ferrous solution and hydrogen peroxide into the injection well at intervals in a circulating manner, detecting a potential value in the detection well, stopping injecting the ferrous solution and the hydrogen peroxide when the potential value reaches a set value and the reaction is finished, detecting the temperature in the detection well in the process of injecting the hydrogen peroxide, and stopping injecting the hydrogen peroxide if the temperature reaches the set value;
and injecting alkali liquor into the injection well, detecting the pH value in the detection well in real time, and stopping injecting the alkali liquor until the pH value reaches a second set value.
The soil remediation system for the contaminated site can monitor the physical and chemical indexes of soil in real time, and realizes accurate pesticide injection of the pesticide injection system through centralized processing of the control system.
Drawings
FIG. 1 is a schematic illustration of the process steps of the present application;
FIG. 2 is a schematic view of the process steps of the drug injection device of the present application;
FIG. 3 is a schematic view of the distribution of the inspection wells and the injection wells of the present application;
FIG. 4 is a schematic view of a dispensing process of the drug injection device of the present application;
FIG. 5 is a schematic view of another embodiment of a dispensing process flow of the drug injection device of the present application;
FIG. 6 is a schematic view of another embodiment of a dispensing process flow of the drug injection device of the present application;
FIG. 7 is a schematic view of the process flow of the drug injection device of the present application.
The reference numerals in the figures are illustrated as follows:
1. detecting a well; 2. a medicine injection well; 3. polluting the field;
10. a clear water inlet; 11. a sewage draining outlet; 12. a first liquid outlet; 13. a second liquid outlet;
22. a third liquid outlet; 23. a fourth liquid outlet; 32. a fifth liquid outlet; 33. a sixth liquid outlet;
42. a seventh liquid outlet; 52. an eighth liquid outlet; 81. a clear liquid inlet; 82. a medicine injection port;
84. a liquid medicine drain outlet;
90. a first bypass; 91. a second bypass; 92. a third bypass; 93. a fourth bypass;
94. a fifth bypass; 95. a sixth bypass;
100. a dispensing device; 200. an acid liquor dispensing device; 300. a ferrous salt solution dispensing device;
400. an alkali liquor dispensing device; 500. a hydrogen peroxide solution dispensing device;
101. an electromagnetic valve; 102. a check valve; 103. a liquid medicine storage tank; 104. a liquid level meter; 105. a blowoff valve;
106. a main pipe ball valve; 107. an evacuation valve; 108. calibrating the column; 109. an inlet valve; 110. a filter;
111. a drug injection pump; 112. a buffer; 113. a pressure relief valve; 114. a one-way valve; 115. an outlet valve;
116. a switching valve; 198. a return pipe; 199. a root valve;
800. a mixer; 801. a clear liquid inlet valve; 802. a self-priming pump; 803. an electric control valve;
804. a main pipe flow meter; 805. a detector; 806. a tubular blender; 807. a medicine outlet ball valve;
808. a medicine injection port electromagnetic valve; 809. a drug injection port flowmeter; 810. a medicament drain valve.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in FIG. 3, the soil remediation system for a contaminated site of the present application is provided with a plurality of injection wells 2 and detection wells 1 adjacent to the injection wells 2, wherein the number and arrangement of the injection wells 2 and the detection wells 1 are designed according to the previous investigation result of the contaminated site 3.
As shown in fig. 1, the soil remediation system of the present application includes: the device comprises a detection device arranged in the detection well 1 and used for detecting physical and chemical indexes of soil or underground water in real time, a medicine injection device communicated with the medicine injection well 2 through a pipeline, and a control device used for receiving detection signals of the detection device and controlling the work of the medicine injection device after judgment and analysis.
The physical and chemical indexes are one or more of pH value, conductivity, potential value and temperature, the judgment and analysis is to compare detected measured values with preset values, or compare a plurality of measured values to obtain a certain rule, and stop or start the corresponding medicine injection device, or adjust the flow of the medicine. The preset values are generally obtained by empirical summary and can be adjusted. If the potential safety hazard exists due to the fact that the formation temperature is detected to be overhigh, the injection should be stopped at the moment; if the pH value of the soil meets the requirements of the Fenton reaction, the injection of the acid solution is stopped, and the hydrogen peroxide is injected instead. The real-time generally means that the detection is carried out periodically and is transmitted back to the control device; for example, the flow direction of the fenton reagent is determined by comparing the potential values of a plurality of detection wells 2 in a certain area, and the injection pressure and flow rate of each injection well 2 are adjusted.
The detection device is used for obtaining the physicochemical indexes of underground water or soil, and can adopt the existing split type detection instrument with remote transmission, and the detection instrument can be at least one of a pH meter, a conductivity meter, a thermometer or a potentiometer. The detection device mainly comprises a detection probe and wireless transmission equipment, wherein the detection probe is arranged in the detection well 1 and transmits a detection signal to the control device in a wireless transmission mode, and the control device displays the detection signal on a display after processing and makes a judgment to control the corresponding medicine injection device.
The control device is mainly used for sending out control signals, controlling an electric control valve or a power device, starting or stopping a medicine injection device, or adjusting the flow of the medicine and the like. In one embodiment, the control device is a PLC (programmable logic controller), the PLC is preset with a control program and is arranged in an electric cabinet of the equipment, and the electric cabinet and the medicine injection device are integrally arranged on the movable support, so that the transfer and calling are facilitated.
The injection device is integrated by various valves, tanks, conveying devices and other chemical equipment, is used for injecting proper medicaments and flow into the injection well 2, and mainly comprises a liquid medicine storage tank 103 and a liquid medicine injection pump 111. The drug solution tank 103 is used for storing a corresponding drug, and is provided according to the type of drug required.
In one embodiment, the chemical liquid storage tank 103 includes a ferrite solution tank, a hydrogen peroxide tank, an acid liquid tank and an alkali liquid tank, and the materials thereof are selected according to the nature of the stored chemical liquid, for example, a stainless steel tank added with molybdenum or other corrosion-resistant elements is mostly used for storing acidic and alkaline chemical liquids, and a glass steel tank is generally used for storing hydrogen peroxide solution, so as to achieve the purpose of storing the chemical liquid for a long time.
The drug injection pump 111 is used for delivering the drug solution in the drug solution tank 103 to a corresponding position, and an inlet thereof is connected to the drug solution tank 103 through a pipeline.
In one embodiment, the drug injection device includes a mixer 800 coupled to at least a portion of the drug solution reservoir 103, the mixer 800 further coupled to a source of fresh water. The mixer 800 is provided with a main pipeline through which clean water flows and a branch pipeline through which chemical liquid flows, and mainly functions to mix various chemical liquids delivered from the chemical liquid storage tank 103 and dilute the mixed liquid with the clean water, or just dilute the mixed liquid. In one embodiment, a self-priming pump 802 is disposed on a pipeline of the mixer 800 connected to the clean water source, and the self-priming pump 802 has a certain outlet pressure to ensure that the oxidant can be injected into the injection well 2.
As shown in FIG. 7, in one embodiment, the mixer 800 is formed by a plurality of tube compounders 806 connected in series, with a single tube compounder 806 being connected to a medical fluid tank 103 by piping. The liquid medicines connected with each tubular mixer 806 are mutually independent and do not interfere with each other, so that the cleaning is convenient.
In one embodiment, as shown in FIG. 6, a metering pump is disposed in the line connecting the chemical liquid tank 103 to the mixer 800. The inlet of the metering pump is connected with the liquid medicine storage tank 103, and the outlet is connected with the bypass of the single mixer. The metering pump has the property of accurate liquid feeding, realizes liquid feeding according to the proportioning requirement, and ensures that the dilution ratio of the medicament is accurate. And a variable frequency motor or an electric quantity adjusting structure is configured, so that the output quantity of the metering pump can be remotely adjusted.
As shown in FIG. 4, in one embodiment, the chemical liquid tank 103 is connected to the mixer through two parallel lines, one of which is a normal operation line and the other is a standby line. When the normal pipeline breaks down, the standby pipeline is started to ensure the normal operation of the equipment.
As shown in FIG. 4, in one embodiment, a return line 198 is provided to the medical fluid reservoir 103, and a pressure relief valve 113 is provided to the return line 198. The pressure relief valve 113 is arranged behind the metering pump outlet pipeline, other parts can not be arranged between the pressure relief valve 113 and the metering pump outlet pipeline except for the pipeline, the set pressure of the pressure relief valve is adjusted in advance, generally 1.5 times of the pressure of the metering pump outlet, when the pipeline at the rear end of the pressure relief valve 113 is blocked, the pipeline pressure is increased, after the set pressure of the pressure relief valve 113 is exceeded, the pressure relief valve 113 works, the liquid medicine flows back to the liquid medicine storage tank 103, the pipeline pressure is released, and the metering pump is protected.
As shown in fig. 2 and 5, the chemical liquid tank 103 is filled with chemicals by a manual operation or other transfer pump, the electromagnetic valve 101 is opened, and clean water flows into the chemical liquid tank 103 through the clean water inlet 10 to dilute the chemicals, and the chemical liquid tank 103 is generally provided with a stirrer to stir the chemicals to be sufficiently diluted. And conveying the diluted liquid medicine to a subsequent medicine injection flow through a metering pump. As shown in fig. 4, the conveying process of the metering pump can also be two parallel paths, one is a normal working path, and the other is a standby path.
An emptying valve 107, a main pipe ball valve 106, a calibration column 108, a root valve 199, an inlet valve 109 and a filter 110 are sequentially arranged between the metering pump and the liquid medicine storage tank 103, when the device is used for the first time, the root valve 199 is opened, and the liquid feeding amount of the metering pump is calibrated by the calibration column 108. In normal use, the inlet valve 109 and the female ball valve 106 on the normal path are opened to keep the pipeline between the metering pump and the liquid medicine storage tank 103 open. The evacuation valve 107 is used for evacuating the chemical in the pipe during maintenance.
The outlet pipeline of the metering pump is sequentially provided with a pressure relief valve 113, a buffer 112, a one-way valve 114 and an outlet valve 115, and the pressure relief valve 113 has the function of relieving the overpressure of the pipeline, automatically relieving the pressure and returning the pressure to the liquid medicine storage tank 103, and protecting the pipeline. The buffer 112 functions to reduce the pulsation of the metering pump, so that the liquid medicine is more smoothly output. The check valve 114 prevents the reverse flow of the liquid medicine. As shown in fig. 4, the metering pump outlet line is also provided with a switching valve 116 for switching between the normal working line and the backup line.
The medicine injection device further comprises a liquid level meter 104 for detecting the high level and the low level of the liquid in the liquid medicine storage tank 103, and the liquid level meter 104 can also control other devices in an interlocking way, such as a low liquid level alarm and stopping the operation of the medicine injection pump 111. A drain valve 105 is connected to the bottom of the chemical liquid tank 103 and flows through the drain port 11 to drain.
As shown in fig. 2, 6 and 7, the medicine injection device includes an acid solution dispensing device 200, a ferrite solution dispensing device 300, an alkali solution dispensing device 400 and a hydrogen peroxide solution dispensing device 500, wherein the first liquid outlet 12 is connected to the first bypass 90, the second liquid outlet 13 is connected to the second bypass 91, the third liquid outlet 22 is connected to the third bypass 92, the fourth liquid outlet 23 is connected to the fourth bypass 93, the fifth liquid outlet 32 is connected to a neutralization tank (not shown in the figure), the sixth liquid outlet 33 is connected to a flocculation tank (not shown in the figure), the seventh liquid outlet 42 is connected to the fifth bypass 94, and the eighth liquid outlet 52 is connected to the sixth bypass 95.
The system of this application not only can be used for restoreing soil, also can be used for restoring the water to in situ restoration soil is taken as an example, and its theory of operation is as follows:
through the early stage test, the technological parameters including pressure and flow of the injection well, pH value, temperature, potential value, resistance value, etc. of the detection well are set.
The acid liquor dispensing device 200 is opened, clear water and acid liquor are fed into the mixer 800 to be mixed, diluted to a set concentration and injected into the corresponding injection well 2, the detection device monitors the pH value in the detection well 1 in real time and feeds the pH value back to the control device, the control device compares the pH value with a set value, the injection speed of the acid in the injection well 2 is high in the initial stage, and the injection speed is gradually reduced as the pH value approaches the set value. And stopping injecting the acid liquor if the measured value reaches the set value. The acid solution dispensing device 200 is closed, the ferrite solution dispensing device 300 is opened, the ferrite solution flows into the mixer 800 and is diluted to a certain concentration by clear water and is injected into the injection well 2, then the hydrogen peroxide solution dispensing device 500 is opened, the hydrogen peroxide solution with a corresponding amount is injected according to the amount of the injected ferrite solution, and the hydrogen peroxide solution is also fed into the mixer 800 and is diluted to a certain proportion by the clear water and then is injected into the injection well 2. The process is circulated, the potential value in the detection well 1 is periodically detected, and the medicine injection is stopped if a set value is reached. During the injection of the hydrogen peroxide solution, the temperature of the detection well 1 is also detected at any time, and if the temperature is too high, the hydrogen peroxide solution dispensing device 500 is automatically turned off to stop the injection.
Soil appears acidity after the fenton reaction, opens alkali lye dispensing device 400, injects alkali lye and adjusts its pH value, because the demand of alkali lye is few, often need not pass through the blender, can directly inject into injection well 2, falls into the settlement scope when its pH value, stops the injection.
The utility model provides a soil repair system is earlier by detection device to detecting well 1 real-time detection and feedback data, transmits to PLC, by PLC centralized control injection device, restores injection well 2 near soil through the injection, and among the repair process, detection device detects in real time, and entire system forms the closed loop to automatic, visual, the digital degree height.
The data of the injection well, the monitoring well and the injection system are transmitted through a local area network, the injection well is provided with an emergency cut-off valve controlled by the local area network in a wireless mode, blowout accidents and explosion accidents are prevented, all data are input into a computer, and decision and control are carried out through the computer system.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features. When technical features in different embodiments are represented in the same drawing, it can be seen that the drawing also discloses a combination of the embodiments concerned.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. The utility model provides a soil repair system for polluting place, pollute the place and be provided with a plurality of injection wells and detection well, detection well with the injection one-to-one sets up, and closes on the injection well, its characterized in that, soil repair system includes:
the detection device is arranged in the detection well and used for detecting the physical and chemical indexes of soil or underground water in real time, wherein the physical and chemical indexes are at least one of pH value, conductivity, potential value and temperature;
the medicine injection device is communicated with the medicine injection well through a pipeline and comprises a liquid medicine storage tank and a medicine injection pump;
and the control device receives the detection signal of the detection device and controls the medicine injection device to work after judgment.
2. The soil remediation system of claim 1 wherein said drug injection means comprises a mixer connected to at least a portion of the drug solution reservoir, said mixer further connected to a source of fresh water.
3. The soil remediation system of claim 2 wherein said mixer is formed from a plurality of tubular blenders connected in series, the individual tubular blenders being connected by a pipeline to a liquid chemical storage tank.
4. The soil remediation system of claim 2 or claim 3 wherein the conduit connecting the chemical tank to the mixer is provided with a metering pump.
5. The soil remediation system of claim 2 or claim 3 wherein the chemical reservoir is connected to the mixer by two parallel lines, one of which is a normal working line and the other of which is a standby line.
6. The soil remediation system of claim 2 or claim 3 wherein the pipeline connecting the mixer to the source of fresh water is provided with a self-priming pump.
7. The soil remediation system of claim 1 wherein the chemical storage tank is provided with a return conduit, the return conduit being provided with a pressure relief valve.
8. The soil remediation system of claim 1 wherein the liquid storage tank comprises a ferrite solution tank, a hydrogen peroxide tank, an acid solution tank, and a base solution tank.
9. The soil remediation system of claim 1 wherein the detection device is at least one of a pH meter, a conductivity meter, a thermometer, or a potentiometer.
10. A method of soil remediation using the soil remediation system of claim 1, comprising the steps of:
mixing and diluting the acid liquor, injecting the diluted acid liquor into a medicine injection well, detecting the pH value in the detection well in real time, and stopping injecting the acid liquor until the pH value reaches a first set value;
injecting ferrous solution and hydrogen peroxide into the injection well at intervals in a circulating manner, detecting a potential value in the detection well, stopping injecting the ferrous solution and the hydrogen peroxide when the potential value reaches a set value and the reaction is finished, detecting the temperature in the detection well in the process of injecting the hydrogen peroxide, and stopping injecting the hydrogen peroxide if the temperature reaches the set value;
and injecting alkali liquor into the injection well, detecting the pH value in the detection well in real time, and stopping injecting the alkali liquor until the pH value reaches a second set value.
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