CN212370816U - Soil remediation system for contaminated site - Google Patents

Abstract

The application provides a soil repair system 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

Soil remediation system for contaminated site

Technical Field

The utility model relates to a soil remediation technical field especially relates to a soil remediation system for polluting place.

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.

SUMMERY OF THE UTILITY MODEL

The utility model provides a soil repair system for polluting place, this repair system can real-time supervision soil's physics and chemistry index, and accurate automatic control medicament injection volume avoids secondary pollution or restores incomplete problem, can accurate control oxidation soil temperature simultaneously, has solved the blowout well of injection in-process, potential safety hazards such as high temperature explosion.

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 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 utility model. 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. The soil remediation system of claim 1 wherein said control means is a PLC controller.

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