CN115055498B - In-situ remediation system and method for organic contaminated soil and underground water - Google Patents
In-situ remediation system and method for organic contaminated soil and underground water Download PDFInfo
- Publication number
- CN115055498B CN115055498B CN202210556669.3A CN202210556669A CN115055498B CN 115055498 B CN115055498 B CN 115055498B CN 202210556669 A CN202210556669 A CN 202210556669A CN 115055498 B CN115055498 B CN 115055498B
- Authority
- CN
- China
- Prior art keywords
- unit
- extraction
- phase
- electrode
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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
-
- 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
- B09C1/06—Reclamation of contaminated soil thermally
-
- 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
- B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention discloses an in-situ remediation system and method for organic contaminated soil and groundwater, comprising the following steps: electrode wells and extraction wells arranged in a preset area of organic contaminated soil and groundwater; the electrodes in the electrode wells are respectively connected with the SCR alternating current voltage regulating unit and the bidirectional direct current pulse unit through the circuit switching unit; when the electrode well works as an in-situ thermal desorption mode, the circuit switching unit is switched to the SCR alternating current voltage regulating unit; when the electrode well works as an electrocatalytic oxidation mode, the circuit switching unit is switched to a bidirectional direct current pulse unit; the extraction well is respectively connected with the vapor extraction component and the liquid extraction component. The invention can realize in-situ thermal desorption, electrocatalytic oxidation and in-situ thermal desorption-electrocatalytic oxidation combined restoration of organic contaminated soil and groundwater, can complete free switching and combination of various processes, and has high degree of automation; meanwhile, the positioning extraction of the heavy component oil phase of the polluted site is realized, and the method can be used for the directional restoration of soil and groundwater in different pollution ranges with different depths.
Description
Technical Field
The invention relates to the technical field of in-situ soil remediation, in particular to an in-situ remediation system and method for organic contaminated soil and underground water.
Background
At present, in-situ thermal desorption is used as a common treatment method for organic contaminated soil and underground water, has the characteristics of small secondary pollution and high removal rate, but relatively has higher energy consumption; electrocatalytic oxidation is used as a high-grade oxidation technology, is widely applied to sewage treatment, has the characteristics of high efficiency, medicament saving and low energy consumption, but has economy and the like due to high construction cost and high total sustainable treatment amount, so that the electrocatalytic oxidation cannot be applied to in-situ treatment of polluted groundwater.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides an in-situ remediation system and method for organic contaminated soil and groundwater.
The invention discloses an in-situ remediation system for organic contaminated soil and groundwater, which comprises the following components: electrode wells and extraction wells arranged in a preset area of organic contaminated soil and groundwater;
the electrodes in the electrode wells are respectively connected with the SCR alternating current voltage regulating unit and the bidirectional direct current pulse unit through the circuit switching unit; when the electrode well works as an in-situ thermal desorption mode, the circuit switching unit is switched to the SCR alternating current voltage regulating unit; when the electrode well works as an electrocatalytic oxidation mode, the circuit switching unit is switched to a bidirectional direct current pulse unit;
the extraction well is respectively connected with a vapor extraction assembly and a liquid extraction assembly, the vapor extraction assembly comprises a vacuum pump, an atomization spraying unit, a steam-water separator and a tail gas treatment unit which are sequentially connected, and the liquid extraction assembly comprises an extraction pump, a mass flowmeter, a condenser, a three-phase separator and a sewage treatment unit which are sequentially connected; the liquid outlet of the steam-water separator is connected with the liquid inlet of the condenser, the gas outlet of the three-phase separator is connected with the gas inlet of the tail gas treatment unit, and the oil outlet of the three-phase separator and the oil outlet of the tail gas treatment unit are both connected to the storage tank.
As a further improvement of the invention, the electrode is a special electrode capable of achieving in-situ thermal desorption and electrocatalytic oxidation, the special electrode comprising: an aluminum alloy row;
the aluminum alloy row is provided with opposite clamping graphite electrode plates at intervals along the height direction, the graphite electrode plates are detachably fixed with the aluminum alloy row through opposite clamping bolts, and the surface of a non-heating area of the aluminum alloy row is coated with an insulating sheath.
As a further improvement of the present invention, the electrode well includes: a well body;
the special electrode is arranged in the well body, the graphite electrode plates are arranged in the plane where the pollution areas are located, quartz sand and conductive liquid are filled in the plane where the corresponding pollution areas are located in the well body, and bentonite is filled in the plane where the corresponding pollution-free areas are located.
As a further improvement of the present invention, there is also included: an intelligent control unit;
the intelligent control unit is respectively connected with one or more of the electrode well, the circuit switching unit, the SCR alternating current voltage regulating unit, the bidirectional direct current pulse unit, the vacuum pump, the atomizing spraying unit, the steam-water separator, the tail gas treatment unit, the extraction pump, the mass flowmeter, the condenser, the three-phase separator, the sewage treatment unit and the storage tank, and is used for realizing intelligent control of in-situ thermal desorption and electrocatalytic oxidation.
As a further improvement of the invention, the intelligent control unit is specifically configured to:
based on the repair process sampling monitoring data, the circuit switching unit is intelligently controlled to realize switching between the SCR alternating current voltage regulating unit and the bidirectional direct current pulse unit;
based on the underground parameters of the electrode well, the working parameters of the SCR alternating current voltage regulating unit and the bidirectional direct current pulse unit are intelligently controlled;
based on the detection parameters of the mass flowmeter, the working parameters of the vapor extraction component and the liquid extraction component are intelligently controlled.
As a further improvement of the invention, the three-phase separator comprises a housing;
a sand blocking plate is arranged in the shell and close to the liquid inlet, and a sand discharging valve is arranged on a sand discharging pipe at the bottom of the grit chamber formed by the sand blocking plate and the inner wall of the shell; a water tank and an oil baffle are sequentially arranged in the shell at the downstream of the sand baffle, a water regulating valve is arranged on a drain pipe at the bottom of the water tank, and a heavy component regulating valve is arranged on an oil outlet pipe at the bottom of an oil outlet tank formed by the oil baffle and the inner wall of the shell; the top of the shell is provided with a demister, and an air outlet pipe connected with the demister is provided with a pressure regulating valve;
water layered up and down in the shell enters the water tank and is connected with the sewage treatment unit through a drain pipe; heavy oil layered up and down in the shell enters the oil outlet tank and is connected with the storage tank through an oil outlet pipe; and the gas generated by three-phase separation in the shell enters the tail gas treatment unit through the gas outlet pipe after passing through the demister.
As a further improvement of the invention, the three-phase separator also comprises a pontoon liquid level gauge and a temperature sensor which are arranged on the shell;
the pontoon liquid level meter and the temperature sensor are connected with the input end of the intelligent control unit, and the water regulating valve and the heavy component regulating valve are connected with the output end of the intelligent control unit;
the intelligent control unit intelligently controls flow regulation of the water regulating valve and the heavy component regulating valve based on the liquid level and the temperature detected by the pontoon liquid level meter and the temperature sensor.
The invention also discloses a method for repairing the organic polluted soil and the underground water based on the in-situ repairing system, which comprises the following steps:
the circuit switching unit is switched to the SCR alternating current voltage regulating unit to enable the electrode well to work in an in-situ thermal desorption mode;
based on the vapor extraction component and the liquid extraction component, the positioning extraction and treatment of the heavy component oil phase and the gas phase in the field are realized;
after the in-situ thermal desorption is completed, the circuit switching unit is switched to the bidirectional direct current pulse unit, so that the electrode well works in the electrocatalytic oxidation mode until the repair is completed.
As a further improvement of the present invention, the extraction method of the vapor extraction module and the liquid extraction module comprises:
extracting gas phase from an extraction well by gas phase extraction, entering a steam-water separator by a vacuum pump and an atomization spraying unit, separating and removing liquid phase by the steam-water separator, and then entering a tail gas treatment unit, and completing standard emission after treatment;
extracting liquid phase from an extraction well, introducing the liquid phase separated by a steam-water separator after passing through an extraction pump and a mass flowmeter into a condenser, and then carrying out three-phase separation by a three-phase separator; the separated gas phase enters a tail gas treatment unit for treatment, the separated heavy component oil phase and the heavy component oil phase collected by the tail gas treatment unit simultaneously enter a storage tank for collection and centralized treatment, and the separated water phase enters a sewage treatment unit for treatment.
As a further improvement of the invention, in the liquid phase extraction process, the extraction pump is controlled to perform stepwise intermittent operation based on the change of the liquid phase temperature and the density.
Compared with the prior art, the invention has the beneficial effects that:
the invention can realize in-situ thermal desorption, electrocatalytic oxidation and in-situ thermal desorption-electrocatalytic oxidation combined restoration of organic contaminated soil and groundwater, can complete free switching and combination of various processes, and has high degree of automation; meanwhile, the positioning extraction of the heavy component oil phase of the polluted site is realized, and the method can be used for the directional restoration of soil and groundwater in different pollution ranges with different depths.
Drawings
FIG. 1 is a schematic diagram of an in situ remediation system for organically-contaminated soil and groundwater according to one embodiment of the present invention;
FIG. 2 is a schematic view showing the structure of an electrode according to an embodiment of the present invention; wherein a is a front view; b is a side view;
FIG. 3 is a schematic view of an electrode well according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a three-phase separator according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an in-situ thermal desorption-electrocatalytic oxidation intelligent electrode well control system according to an embodiment of the present invention.
In the figure:
1. an electrode well; 2. an extraction well; 3. a circuit switching unit; 4. an SCR alternating current voltage regulating unit; 5. a bidirectional DC pulse unit; 6. an intelligent control unit; 7. a vacuum pump; 8. an atomization spraying unit; 9. a steam-water separator; 10. a tail gas treatment unit; 11. an extraction pump; 12. a mass flowmeter; 13. a condenser; 14. a three-phase separator; 15. a sewage treatment unit; 16. a storage tank; 17. a power supply device;
1-1, a special electrode; 1-1-1, aluminum alloy rows; 1-1-2 parts of graphite electrode plate; 1-1-3, a butt clamp bolt; 1-1-4, aluminum row connecting holes; 1-1-5, insulating sheath; 1-2, a non-contaminated area; 1-3, contaminated areas; 1-4, a well body; 1-5 parts of bentonite; 1-6, quartz sand and conductive liquid; 1-7, an injection tube;
14-1, a sand baffle; 14-2, a sand discharge valve; 14-3, a water regulating valve; 14-4, a heavy component regulating valve; 14-5, an oil baffle plate; 14-6, a pressure regulating valve; 14-7, a demister; 14-8, a pontoon liquid level gauge; 14-9, a temperature sensor; 14-10 parts of a water tank; 14-11, a grit chamber; 14-12, a shell.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is described in further detail below with reference to the attached drawing figures:
the invention provides an in-situ remediation system and method for organic contaminated soil and underground water, which can be used for in-situ thermal desorption and in-situ electrocatalytic oxidation by improving an in-situ thermal desorption electrode well and a power supply unit, and can realize the positioning extraction of an in-situ heavy component oil phase, in-situ thermal desorption, electrocatalytic oxidation and in-situ thermal desorption-electrocatalytic oxidation combined remediation by matching with site design and a targeted treatment strategy; the invention solves the problems of higher energy consumption of single thermal desorption repair and high cost of single electrocatalytic oxidation in-situ groundwater repair, and provides more flexibility for process selection.
Specific:
as shown in fig. 1 and 5, the present invention provides an in situ remediation system for organically-polluted soil and groundwater, comprising: electrode well 1, extraction well 2 and monitoring well (not shown) are designed and built according to the geological features and pollution conditions of the field; wherein, the liquid crystal display device comprises a liquid crystal display device,
the electrode in the electrode well 1 is respectively connected with an SCR alternating current voltage regulating unit 4 and a bidirectional direct current pulse unit 5 through a circuit switching unit 3, and the SCR alternating current voltage regulating unit 4 and the bidirectional direct current pulse unit 5 are respectively connected with a power supply device 17 (mains supply); when the electrode well 1 works as an in-situ thermal desorption mode, the circuit switching unit 3 is switched to the SCR alternating current voltage regulating unit 4, the SCR alternating current voltage regulating unit 4 starts to work, alternating current is supplied to the electrode well 1, and the soil and the groundwater serving as conductors are heated based on current thermal efficiency; when the electrode well 1 works as an electrocatalytic oxidation mode, the circuit switching unit 3 is switched to the bidirectional direct current pulse unit 5, the bidirectional direct current pulse unit 5 applies forward and reverse direct current pulse voltage to the electrode well 1, and applies a high-density full-coverage electric field to a repair area to perform electrocatalytic oxidation; based on the method, in-situ thermal desorption, electrocatalytic oxidation and in-situ thermal desorption-electrocatalytic oxidation combined restoration of the organic contaminated soil and the underground water can be realized.
On the basis of the scheme, as shown in fig. 2, the electrode of the invention adopts a special electrode 1-1 which can be used as a combination of heating SCR alternating current voltage regulation and electrocatalytic oxidation bidirectional direct current pulse, and the special electrode 1-1 comprises: 1-1-1 of aluminum alloy row, 1-1-2 of graphite electrode plate, 1-1-3 of butt clamp bolt and 1-1-5 of insulating sheath; the aluminum alloy row 1-1 is provided with opposite clamping graphite electrode plates 1-1-2 at intervals along the height direction, corresponding positions on the aluminum alloy row 1-1-1 are provided with aluminum row connecting holes 1-1-4, the graphite electrode plates 1-1-2 pass through the corresponding aluminum row connecting holes 1-1-4 through opposite clamping bolts to realize detachable fixation with the aluminum alloy row 1-1-1, and the non-heating area surface of the aluminum alloy row 1-1 is coated with an insulating sheath 1-1-5.
Further, the aluminum alloy row 1-1-1 has the characteristics of low density and high strength, and has excellent conductivity of 2.2 multiplied by 10 -8 Ω m, thermal conductivity and corrosion resistance, tensile ductility; compared with the common copper column electrode, the aluminum alloy row 1-1-1 has lower density, so that the aluminum alloy row is lighter in weight and smaller in longitudinal stress, and can effectively resist stress deformation caused by soil heating. The high-power graphite electrode plate 1-1-2 is customized to have the conductivity not lower than 25A/cm 2 The surface is coated with an oxidation-resistant protective layer, and has the characteristics of light weight, corrosion resistance, high temperature resistance and the like.
Further, according to the type and concentration of pollutants, the heating power of soil in unit volume is calculated, and the area of the graphite electrode plate 1-1-2 used for the length of the aluminum alloy row is designed, so that the gap size of the graphite electrode plate 1-1-2 on the aluminum alloy row 1-1-1 is adjusted, and the gap is protected by a high-temperature insulating sheath 1-1-5; meanwhile, the multi-section aluminum alloy rows can be connected through bolts according to the depth of the well, and only the aluminum rows are reserved for the stratum which does not need to be heated to be used as the framework to wrap the high-temperature insulating sheath 1-1-5. Furthermore, the special electrode is used for being installed in soil, the alternating current voltage AC is 30-600V, and the direct current pulse voltage DC is 0-100V; preferably, the width of the aluminum alloy row is 100cm and the thickness is 6cm, and the width of the graphite electrode plate is 200cm and the thickness is 10cm.
On the basis of the scheme, as shown in FIG. 3, the electrode well comprises a well body 1-4, a special electrode 1-1 is arranged in the well body 1-4, and a graphite electrode plate 1-1-2 is arranged in a plane where a pollution area 1-3 is located; meanwhile, quartz sand and conductive liquid 1-6 are filled in the planes of the pollution areas 1-3 with different depths corresponding to the well body 1-4, and bentonite 1-5 is filled in the planes of the pollution-free areas 1-2 with different depths corresponding to the well body 1-4.
Furthermore, when the special electrode 1-1 is used as a heating electrode and a high-grade oxidation electrode, carbon powder is released, and the carbon powder is gradually dispersed in the peripheral heating soil, so that the conductivity is increased, and the heating and oxidation effects are enhanced; meanwhile, if the conductivity cannot meet the requirement, carbon-containing powder conductive liquid can be supplemented into the polluted soil and the underground water through the injection pipes 1-7. Meanwhile, the invention can also supplement water to the special electrode well through the injection pipe 1-7 according to the water extraction amount of the extraction well, so as to maintain the groundwater level.
As shown in fig. 1, a multiphase extraction well 2 of the invention is respectively connected with a vapor phase extraction assembly and a liquid phase extraction assembly, the vapor phase extraction assembly comprises a vacuum pump 7, an atomization spraying unit 8, a steam-water separator 9 and a tail gas treatment unit 10 which are sequentially connected, and the liquid phase extraction assembly comprises an extraction pump 11, a mass flowmeter 12, a condenser 13, a three-phase separator 14 and a sewage treatment unit 15 which are sequentially connected; wherein, the liquid outlet of vapour-water separator 9 connects the inlet of condenser 13, and the gas outlet of three-phase separator 14 connects the air inlet of tail gas treatment unit 10, and the oil-out of three-phase separator 14 and the oil-out of tail gas treatment unit 10 all are connected to storage tank 16.
The specific extraction method comprises the following steps: the vapor extraction extracts vapor from the extraction well 2, enters a vapor-water separator 9 through a vacuum pump 7 and an atomization spraying unit 8, and enters a tail gas treatment unit 10 after liquid phase is separated and removed through the vapor-water separator 9, so that standard emission is achieved after treatment; liquid phase extraction extracts liquid phase from the extraction well 2, the liquid phase separated by the steam-water separator 9 after passing through the extraction pump 11 and the mass flowmeter 12 enters the condenser 13 together, and then three-phase separation is carried out by the three-phase separator 14; the separated gas phase enters the tail gas treatment unit 10 for treatment, the separated heavy component oil phase and the heavy component oil phase collected by the tail gas treatment unit 10 simultaneously enter the storage tank 16 for collection and centralized treatment, and the separated water phase enters the sewage treatment unit 15 for treatment.
On the basis of the scheme, as shown in FIG. 4, the three-phase separator 14 of the invention comprises a sand baffle 14-1, a sand discharge valve 14-2, a water regulating valve 14-3, a heavy component regulating valve 14-4, an oil baffle 14-5, a pressure regulating valve 14-6, a demister 14-7, a pontoon level gauge 14-8, a temperature sensor 14-9, a water tank 14-10, a sand basin 14-11 and a shell 14-12; wherein, a sand baffle 14-1 is arranged in the shell 14-12 near the liquid inlet, a sand discharge valve 14-2 is arranged on a sand discharge pipe at the bottom of a sand basin 14-11 formed by the sand baffle 14-1 and the inner wall of the shell, and when sand is piled up to a certain height, the sand discharge valve 14-2 is opened to discharge sand; a water tank 14-10 and an oil baffle 14-5 are sequentially arranged in the shell 14-12 at the downstream of the sand baffle 14-1, a water regulating valve 14-3 is arranged on a drain pipe at the bottom of the water tank 14-10, and a heavy component regulating valve 14-4 is arranged on an oil outlet pipe at the bottom of an oil outlet pool formed by the oil baffle 14-5 and the inner wall of the shell; the top of the shell 14-12 is provided with a demister 14-7, and an air outlet pipe connected with the demister 14-7 is provided with a pressure regulating valve 14-6; meanwhile, the shell 14-12 is also provided with a pontoon level meter 14-8 and a temperature sensor 14-9 for detecting the water phase and oil phase levels and temperatures.
When the three-phase separator 14 is used, water layered up and down in the shell 14-12 enters the water tank 14-10 and is connected with the sewage treatment unit 15 through a drain pipe; heavy oil vertically layered in the shell 14-12 enters an oil outlet tank and is connected with a storage tank 16 through an oil outlet pipe; the gas generated by three-phase separation in the shell passes through the demister 14-7 and then enters the tail gas treatment unit 10 through the gas outlet pipe.
Based on the above scheme, the mass flowmeter 12 of the invention can monitor the flow rate and the density temperature of fluid, the mass flowmeter 12 is provided with a driving coil, two ends of the mass flowmeter are provided with detection coils, when the exciting voltage provided by a transmitter is applied to the driving coil, the vibrating tube vibrates in a reciprocating cycle, fluid medium in the working process flows through the vibrating tube of the sensor, so that coriolis force effect can be generated on the vibrating tube to enable the two vibrating tubes to vibrate in a twisting way, the detection coils arranged at two ends of the vibrating tube generate two groups of signals with different phases, and the phase difference of the two signals is in proportional relation with the mass flow rate of the fluid flowing through the sensor. Calculating the mass flow through the vibrating tube by a computer; meanwhile, when different media flow through the sensor, the main vibration frequencies of the vibration tube are different, and the density of the media is calculated according to the main vibration frequencies. The platinum resistor mounted on the sensor vibrating tube can indirectly measure the temperature of the medium.
The technical requirements of the mass flowmeter are as follows:
mass flow accuracy ± 0.002 x flow ± zero drift;
density measurement accuracy +/0.003 g/cm 3 ；
The density measuring range is 0.5-1.5 g/cm 3 。
In order to realize the intelligent control of the repairing process, the repairing system of the invention further comprises: an intelligent control unit 6; the intelligent control unit 6 is respectively connected with one or more of the electrode well 1, the circuit switching unit 3, the SCR alternating current voltage regulating unit 4, the bidirectional direct current pulse unit 5, the vacuum pump 7, the atomization spraying unit 8, the steam-water separator 9, the tail gas treatment unit 10, the extraction pump 11, the mass flowmeter 12, the condenser 13, the three-phase separator 14, the sewage treatment unit 15 and the storage tank 16, and is used for realizing intelligent control of each stage of in-situ thermal desorption and electrocatalytic oxidation.
Further, in the three-phase separator 14, the pontoon level gauge 14-8 and the temperature sensor 14-9 are connected to the input terminal of the intelligent control unit 6, and the water regulating valve 14-3 and the heavy component regulating valve 14-4 are connected to the output terminal of the intelligent control unit 6.
The specific functions of the intelligent control unit 6 of the present invention may include:
1) Based on the detection parameters (parameters such as mass flow, density, temperature and the like) of the mass flowmeter 12, the intelligent control circuit switching unit 3 realizes the switching between the SCR alternating current voltage regulating unit 4 and the bidirectional direct current pulse unit 5; for example, when the mass flowmeter 12 detects that the soil pollutant reaches within 10 times of the restoration target, it indicates that thermal desorption is completed, and at this time, the circuit switching unit 3 is switched to the bidirectional direct current pulse unit 5, and restoration is continued by the electrocatalytic oxidation technology.
2) Based on the underground detection parameters (parameters such as resistance, conductivity and the like) of the electrode well 1, the working parameters (parameters such as working voltage, working time and the like) of the SCR alternating current voltage regulating unit 4 and the bidirectional direct current pulse unit 5 are intelligently controlled; for example, parameters such as forward and reverse working time, voltage, power and the like of the bidirectional direct current pulse unit 5 can be automatically adjusted according to the field resistance, so that the output voltage is ensured to be constant.
3) Based on the detected parameters (parameters such as mass flow rate, density, temperature, etc.) of the mass flowmeter 12, intelligently controlling the working parameters (parameters such as whether to start, when to start, working time, intermittent time, etc.) of each device of the vapor extraction component and the liquid extraction component; for example:
(1) when liquid phase extraction is performed, the extraction pump 11, the mass flowmeter 12, the condenser 13, the three-phase separator 14, the sewage treatment unit 15 and the storage tank 16 are controlled to be started; meanwhile, in the liquid phase extraction process, the extraction pump is controlled to perform stepwise intermittent operation based on the change of the liquid phase temperature and the density;
(2) when the thermal desorption temperature reaches the set temperature (40 ℃), the vacuum pump 7, the atomizing spray unit 8, the steam-water separator 9 and the tail gas treatment unit 10 are controlled to be started for gas phase extraction.
(3) Based on different heavy component oil phases, adjusting working parameters of equipment such as a condenser 13 and the like;
(4) based on the liquid level and temperature detected by the pontoon level gauge 14-8 and the temperature sensor 14-9, the flow rate adjustment of the water-adjusting valve 14-3 and the heavy-component-adjusting valve 14-4 is intelligently controlled.
Specific:
as shown in fig. 5, the present invention provides an electrode well intelligent control system for in-situ thermal desorption-electrocatalytic oxidation, comprising: the electrode well 1, the circuit switching unit 3, the SCR alternating current voltage regulating unit 4, the bidirectional direct current pulse unit 5 and the intelligent control unit 6; wherein, the liquid crystal display device comprises a liquid crystal display device,
when the electrode well 1 works as an in-situ thermal desorption mode, the intelligent control unit 6 controls the circuit switching unit 3 to switch to the SCR alternating current voltage regulating unit 4, the SCR alternating current voltage regulating unit 4 starts to work, alternating current is supplied to the electrode well 1, and the soil and underground water serving as conductors are heated based on current thermal efficiency; during the heating process, when the site temperature deltat is monitored on site to meet the following conditions: t is t 0 ≤Δt＜t 1 The intelligent control unit 6 controls the constant power output of the SCR alternating current voltage regulating unit 4; when the on-site monitoring temperature deltat meets the following conditions: t is t 1 ≤Δt＜t 2 The intelligent control unit 6 controls the constant voltage output of the SCR alternating current voltage regulating unit 4; wherein t is 0 To restore the initial temperature of the site, t 1 To actually measure the temperature corresponding to the deviation value of the field resistance and the initial field resistance is larger than a first threshold value, t 2 Is the set temperature when the heating mode is stopped.
On the basis of the scheme, the SCR alternating current voltage regulating unit 4 comprises a measuring instrument which is used for measuring parameters such as current, voltage, power, temperature and pressure of a repair site and providing linkage protection; the SCR unit of the SCR alternating current voltage regulating unit 4 is overlapped by adopting an SCR module, the front end is provided with a fast melting protection, and the cooling mode is water cooling; the power supply of the SCR alternating current voltage regulating unit 4 is an isolated power supply, and 4 voltage classes are provided according to the system requirements.
On the basis of the scheme, t of the invention 1 The determining method for the temperature corresponding to the deviation value of the actual field resistance and the initial field resistance is more than 10 percent comprises the following steps:
collecting undisturbed soil of a stratum i according to a geological survey report; determination of resistivity ρ of undisturbed soil of each formation at different temperatures it The method comprises the steps of carrying out a first treatment on the surface of the At temperature t, inter-well resistance R t And the thickness L of each stratum i And resistivity ρ it The relation of (2) is:
as the heating process proceeds, the temperature t 1 Time-well resistor R t1 And an initial temperature t 0 Interwell resistance R at the time t0 The ratio is as follows:
according to the current and voltage data in the heating process, real-time monitoring is carried outWhen the deviation of the two is more than 10%, the mark is markedRecording the temperature t at this time 1 。
Based on the scheme, when the SCR alternating current voltage regulating unit 4 outputs constant power, the power P is output 1 Constant and adjustable in 0-500kVA, I 1 For the in-situ detection value as an independent variable, U 1 In order to set voltage as an adjustment quantity, the energy is input into the first stage, and the temperature is quickly raised; when the constant voltage of the SCR alternating current voltage regulating unit 4 is output, the output voltage U 2 Constant and adjustable at 0-1000V, I 2 For the field detection value as an independent variable, P 2 In order to set power as an adjustment amount, the second stage energy input stage protects the electrode well from damage and the temperature rises steadily.
When the electrode well 1 of the present invention is operated as an electrocatalytic oxidation mode, when t 2 And the thermal desorption mode of the SCR alternating current voltage regulating unit 4 is not more than deltat, the circuit switching unit 3 is controlled by the intelligent control unit 6 to be switched to the bidirectional direct current pulse unit 5, the system enters an electrocatalytic oxidation mode, and a high-frequency power electronic conversion technology is adopted to output pulses. The intelligent control unit 6 controls the constant voltage output of the bidirectional direct current pulse unit 5.
On the basis of the scheme, the bidirectional direct current pulse unit 5 consists of a control circuit, a human-computer interface and a bidirectional pulse adjustable power supply, wherein the human-computer interface is a touch screen, has a configuration function, displays running pictures, and realizes manual operation and program automatic control; in the running process of the system, the electrocatalytic oxidation environment is unstable due to the change of moisture, pollutant ions, temperature and the like in the soil, and the system adopts constant-pressure control, namely, the output voltage U 3 Constant and adjustable at 0-24V, I 3 For the field detection value as an independent variable, t 3 The forward and reverse working time is set as the adjustment quantity, and the forward and reverse pulses with different amplitudes meeting the system operation requirement can be obtained. The input end of the bidirectional pulse adjustable power supply is power frequency alternating current, and the output is bidirectional direct current pulse and can be controlled by a program; the input power frequency alternating current generates bidirectional direct current pulse through a direct current converter, and a rectifier in the converter adjusts unstable current and corrects input power factors.
The invention provides a method for repairing organic contaminated soil and underground water based on the in-situ repairing system, which comprises the following steps:
step 1, according to the detection value of the density of the solution in the multiphase extraction well 2, adjusting the depth of an inlet of an extraction pipe, controlling the extraction time, and only extracting target pollutant liquid;
step 2, switching the circuit switching unit 3 to the SCR alternating current voltage regulating unit 4 to enable the electrode well to work in an in-situ thermal desorption mode;
step 3, heating at a constant temperature according to the melting point of the target pollutant, and separating heavy component oil phase from water through a condenser 13 and a three-phase separator 14; and when heating to a preset temperature, starting vapor extraction treatment;
and 4, after the in-situ thermal desorption is finished (for example, when the content of soil pollutants is within 10 times of the restoration target), the circuit switching unit 3 is switched to the bidirectional direct current pulse unit 5, forward and reverse direct current pulse voltage is applied to the electrode well 1, and high-density full-coverage electric field is applied to the restoration area to perform electrocatalytic oxidation.
Examples:
the nitrobenzene soil content of a certain polluted land block is 350mg/kg on average, the restoration target is 4.46mg/kg, the 4-chloroaniline is 1200mg/kg, the restoration target is 38mg/kg, and the pollution depth is 20 meters.
Nitrobenzene as target pollutant: a relative density of 1.205 (15/4 ℃), a melting point of 5.7 ℃, a boiling point of 210.9 ℃, a colorless or pale yellow (nitrogen dioxide impurity-containing) oily liquid;
the target pollutant 4-chloroaniline has relative density of 1.43, melting point of 72.5 deg.c and boiling point of 232 deg.c, and is white or pale yellow crystal dissolved in hot water.
The field geological structure is a mixed filling layer, a clay layer and a silt layer, because each section has different resistivity, 3 sections of well construction are adopted, special electrodes are ordered according to the density of a pollution range, the aluminum row among the three sections is connected with a thermal shrinkage sleeve for insulation, the electrodes are isolated by quartz sand and bentonite, and the electrodes are subjected to multiphase extraction and layered arrangement.
The method for restoring the composite pollution of nitrobenzene and 4-chloroaniline comprises the following steps:
step 1, well construction and installation and debugging of various devices;
step 2, starting liquid phase extraction, switching the circuit switching unit 3 to the SCR alternating current voltage regulating unit 4, supplying alternating current to the special electrode well 1, and heating the field soil and the groundwater;
step 3, according to the physical characteristics of nitrobenzene, extracting the nitrobenzene according to the following table 1:
TABLE 1
| Temperature (DEG C) | Density setting g/cm 3 | Density detection value > set value | Density detection value<Setting value |
| 20 | 1.18 | Pump extraction operation | Standing for 30min |
| 25 | 1.15 | Pump extraction operation | Standing for 45 min |
| 30 | 1.12 | Pump extraction operation | Standing for 110 min |
| 35 | 1.1 | Pump extraction transportRow of lines | Standing for 120min |
| 40 | 1.07 | Pump extraction operation | Standing for 150min |
| 45 | 1.05 | Pump extraction operation | Standing for 180 min |
The water inlet of the extraction pipeline is arranged at the bottom of the multiphase extraction well 2, the medium with high density can be preferentially extracted, the mass flowmeter 12 can detect the temperature and the density of extracted liquid in real time, the intelligent control unit 6 can compare the detection value of the mass flowmeter 12 with the detection value of the table 1, the operation of the extraction pump 11 is automatically controlled, and the standing time is reserved for underground water; after each standing is completed, the extraction pump is started to run for at least 10min;
step 4, starting a vacuum pump 7, an atomization spraying unit 8, a gas-liquid separator 9 and a tail gas treatment unit 10 when the underground temperature exceeds 40 ℃; the intelligent control unit 6 automatically supplements water to the special electrode well 1 according to the water extraction amount, and maintains the underground water level; after heating to 45 ℃, circularly extracting for 15 days, detecting that the nitrobenzene content in the extracted liquid phase is 3mg/L, and transferring to the extraction process of the 4-chloroaniline.
And 5, according to the physical characteristics of the 4-chloroaniline, the extraction process of the 4-chloroaniline is as follows:
continuously applying alternating current to the special electrode 1-1 to heat the soil and the underground water in situ, heating the soil and the underground water to 60 ℃, dissolving 4-chloroaniline in hot water at the moment, and then extracting; when the detected relative density is more than 1.2, continuously extracting, and standing for 30min, and then starting the cyclic extraction for at least 10min; heating to 65deg.C, detecting relative density greater than 1.1, continuously extracting, and circularly extracting with relative density less than 1.1, and standing for 60min; heating to 70deg.C, detecting relative density greater than 1.05, continuously extracting, detecting relative density less than 1.05, starting cyclic extraction, and standing for 120min; maintaining the temperature after heating to 75deg.C, extracting to obtain liquid phase with relative density greater than 1.0, continuously extracting to obtain liquid phase with relative density less than 1.0, starting cyclic extraction, extracting for 30min each time, and standing for 150min; until the relative density of the extract reaches 0.98, the continuous circulation extraction is maintained for 15 days.
Step 6, stopping heating, switching to a bidirectional direct current pulse unit, performing electrocatalytic oxidation, extracting liquid phase for sampling analysis until the content of 4-chloroaniline is lower than 20mg/L, and stopping electrocatalytic oxidation; and (3) detecting the soil sample taken by drilling to reach a repairing target value.
Further, when the 4-chloroaniline solution was treated, the temperature was controlled at 65℃by a condenser. Too low a temperature can crystallize to block the pipeline, and too high a temperature is unfavorable for layered sedimentation; meanwhile, the interface between the heavy component and the water outlet regulating valve is kept constant.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An in situ remediation system for organically-contaminated soil and groundwater, comprising: electrode wells and extraction wells arranged in the preset areas of the organic polluted soil and the underground water, and an intelligent control unit;
the electrodes in the electrode wells are respectively connected with the SCR alternating current voltage regulating unit and the bidirectional direct current pulse unit through the circuit switching unit; when the electrode well works as an in-situ thermal desorption mode, the circuit switching unit is switched to the SCR alternating current voltage regulating unit; when the electrode well works as an electrocatalytic oxidation mode, the circuit switching unit is switched to a bidirectional direct current pulse unit; the electrode is a special electrode capable of realizing in-situ thermal desorption and electrocatalytic oxidation, and the special electrode comprises: an aluminum alloy row; the aluminum alloy row is provided with opposite clamping graphite electrode plates at intervals along the height direction, the graphite electrode plates are detachably fixed with the aluminum alloy row through opposite clamping bolts, and the non-heating area surface of the aluminum alloy row is coated with an insulating sheath;
the extraction well is respectively connected with a vapor extraction assembly and a liquid extraction assembly, the vapor extraction assembly comprises a vacuum pump, an atomization spraying unit, a steam-water separator and a tail gas treatment unit which are sequentially connected, and the liquid extraction assembly comprises an extraction pump, a mass flowmeter, a condenser, a three-phase separator and a sewage treatment unit which are sequentially connected; the liquid outlet of the steam-water separator is connected with the liquid inlet of the condenser, the gas outlet of the three-phase separator is connected with the gas inlet of the tail gas treatment unit, and the oil outlet of the three-phase separator and the oil outlet of the tail gas treatment unit are both connected to the storage tank;
the intelligent control unit is respectively connected with one or more of the electrode well, the circuit switching unit, the SCR alternating current voltage regulating unit, the bidirectional direct current pulse unit, the vacuum pump, the atomizing spray unit, the steam-water separator, the tail gas treatment unit, the extraction pump, the mass flowmeter, the condenser, the three-phase separator, the sewage treatment unit and the storage tank, and is used for realizing intelligent control of in-situ thermal desorption and electrocatalytic oxidation;
the three-phase separator comprises a shell; a sand blocking plate is arranged in the shell and close to the liquid inlet, and a sand discharging valve is arranged on a sand discharging pipe at the bottom of the grit chamber formed by the sand blocking plate and the inner wall of the shell; a water tank and an oil baffle are sequentially arranged in the shell at the downstream of the sand baffle, a water regulating valve is arranged on a drain pipe at the bottom of the water tank, and a heavy component regulating valve is arranged on an oil outlet pipe at the bottom of an oil outlet tank formed by the oil baffle and the inner wall of the shell; the top of the shell is provided with a demister, and an air outlet pipe connected with the demister is provided with a pressure regulating valve; water layered up and down in the shell enters the water tank and is connected with the sewage treatment unit through a drain pipe; heavy oil layered up and down in the shell enters the oil outlet tank and is connected with the storage tank through an oil outlet pipe; and the gas generated by three-phase separation in the shell enters the tail gas treatment unit through the gas outlet pipe after passing through the demister.
2. The in situ remediation system of claim 1, wherein the electrode well comprises: a well body;
the special electrode is arranged in the well body, the graphite electrode plates are arranged in the plane where the pollution areas are located, quartz sand and conductive liquid are filled in the plane where the corresponding pollution areas are located in the well body, and bentonite is filled in the plane where the corresponding pollution-free areas are located.
3. The in situ remediation system of claim 1, wherein the intelligent control unit is specifically configured to:
based on the repair process sampling monitoring data, the circuit switching unit is intelligently controlled to realize switching between the SCR alternating current voltage regulating unit and the bidirectional direct current pulse unit;
based on the underground parameters of the electrode well, the working parameters of the SCR alternating current voltage regulating unit and the bidirectional direct current pulse unit are intelligently controlled;
based on the detection parameters of the mass flowmeter, the working parameters of the vapor extraction component and the liquid extraction component are intelligently controlled.
4. The in situ remediation system of claim 1, wherein said three-phase separator further comprises a pontoon level gauge and a temperature sensor disposed on said housing;
the pontoon liquid level meter and the temperature sensor are connected with the input end of the intelligent control unit, and the water regulating valve and the heavy component regulating valve are connected with the output end of the intelligent control unit;
the intelligent control unit intelligently controls flow regulation of the water regulating valve and the heavy component regulating valve based on the liquid level and the temperature detected by the pontoon liquid level meter and the temperature sensor.
5. A method for remediation of organically contaminated soil and groundwater based on the in situ remediation system of any one of claims 1 to 4, comprising:
the circuit switching unit is switched to the SCR alternating current voltage regulating unit to enable the electrode well to work in an in-situ thermal desorption mode;
based on the vapor extraction component and the liquid extraction component, the positioning extraction and treatment of the heavy component oil phase and the gas phase in the field are realized;
after the in-situ thermal desorption is completed, the circuit switching unit is switched to the bidirectional direct current pulse unit, so that the electrode well works in the electrocatalytic oxidation mode until the repair is completed.
6. The repair method of claim 5, wherein the extraction method of the vapor extraction module and the liquid extraction module comprises:
extracting gas phase from an extraction well by gas phase extraction, entering a steam-water separator by a vacuum pump and an atomization spraying unit, separating and removing liquid phase by the steam-water separator, and then entering a tail gas treatment unit, and completing standard emission after treatment;
extracting liquid phase from an extraction well, introducing the liquid phase separated by a steam-water separator after passing through an extraction pump and a mass flowmeter into a condenser, and then carrying out three-phase separation by a three-phase separator; the separated gas phase enters a tail gas treatment unit for treatment, the separated heavy component oil phase and the heavy component oil phase collected by the tail gas treatment unit simultaneously enter a storage tank for collection and centralized treatment, and the separated water phase enters a sewage treatment unit for treatment.
7. The method of claim 5, wherein the extraction pump is controlled to operate intermittently in stages based on the change in the temperature and density of the liquid phase during the liquid phase extraction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210556669.3A CN115055498B (en) | 2022-05-19 | 2022-05-19 | In-situ remediation system and method for organic contaminated soil and underground water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210556669.3A CN115055498B (en) | 2022-05-19 | 2022-05-19 | In-situ remediation system and method for organic contaminated soil and underground water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115055498A CN115055498A (en) | 2022-09-16 |
| CN115055498B true CN115055498B (en) | 2023-08-01 |
Family
ID=83197575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210556669.3A Active CN115055498B (en) | 2022-05-19 | 2022-05-19 | In-situ remediation system and method for organic contaminated soil and underground water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115055498B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103230933A (en) * | 2013-04-11 | 2013-08-07 | 华北电力大学 | A device for remediation of organic contaminated soil by using thermal desorption combined with an oxidant and a remediation method |
| CN107185957A (en) * | 2017-06-22 | 2017-09-22 | 华东师范大学 | A kind of soil repair system of quick improvement soil organic matter and heavy metal |
| KR101995210B1 (en) * | 2018-10-02 | 2019-10-17 | 주식회사 효림 | Soil Remedation and Monitoring System Using Thermal Enhanced Soil Vapor Extraction by in situ Thermal Desorption Device |
| CN111659723A (en) * | 2020-07-19 | 2020-09-15 | 上海康恒环境修复有限公司 | In-situ thermal desorption remediation system and method for organic contaminated soil |
| CN111687190A (en) * | 2020-06-19 | 2020-09-22 | 中科鼎实环境工程有限公司 | In-situ resistance heating-microbial degradation coupling technology soil remediation system |
| CN112570437A (en) * | 2020-11-26 | 2021-03-30 | 北京建工环境修复股份有限公司 | System and method for restoring organic polluted site by in-situ heat conduction coupling electroosmosis well point dewatering |
| CN215745485U (en) * | 2021-05-27 | 2022-02-08 | 中国电建集团中南勘测设计研究院有限公司 | Electrode assembly for heavy metal contaminated soil treatment and electric repair system |
| CN114101305A (en) * | 2022-01-27 | 2022-03-01 | 北京高能时代环境技术股份有限公司 | In-situ low-temperature enhanced chemical oxidation remediation system and method for organic contaminated site |
-
2022
- 2022-05-19 CN CN202210556669.3A patent/CN115055498B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103230933A (en) * | 2013-04-11 | 2013-08-07 | 华北电力大学 | A device for remediation of organic contaminated soil by using thermal desorption combined with an oxidant and a remediation method |
| CN107185957A (en) * | 2017-06-22 | 2017-09-22 | 华东师范大学 | A kind of soil repair system of quick improvement soil organic matter and heavy metal |
| KR101995210B1 (en) * | 2018-10-02 | 2019-10-17 | 주식회사 효림 | Soil Remedation and Monitoring System Using Thermal Enhanced Soil Vapor Extraction by in situ Thermal Desorption Device |
| CN111687190A (en) * | 2020-06-19 | 2020-09-22 | 中科鼎实环境工程有限公司 | In-situ resistance heating-microbial degradation coupling technology soil remediation system |
| CN111659723A (en) * | 2020-07-19 | 2020-09-15 | 上海康恒环境修复有限公司 | In-situ thermal desorption remediation system and method for organic contaminated soil |
| CN112570437A (en) * | 2020-11-26 | 2021-03-30 | 北京建工环境修复股份有限公司 | System and method for restoring organic polluted site by in-situ heat conduction coupling electroosmosis well point dewatering |
| CN215745485U (en) * | 2021-05-27 | 2022-02-08 | 中国电建集团中南勘测设计研究院有限公司 | Electrode assembly for heavy metal contaminated soil treatment and electric repair system |
| CN114101305A (en) * | 2022-01-27 | 2022-03-01 | 北京高能时代环境技术股份有限公司 | In-situ low-temperature enhanced chemical oxidation remediation system and method for organic contaminated site |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115055498A (en) | 2022-09-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105834205A (en) | In-situ electric heating desorption restoration technology and device for contaminated site | |
| CN100380064C (en) | System and method for rapid heating of fluid | |
| CN208050568U (en) | A kind of contaminated soil original position thermal desorption repair system | |
| CN103410488A (en) | Natural gas hydrate water discharge gas production exploitation device and exploitation method of natural gas hydrate water discharge gas production exploitation device | |
| CN112170471A (en) | In-situ thermal desorption method and in-situ thermal desorption system for contaminated soil | |
| CN112570437A (en) | System and method for restoring organic polluted site by in-situ heat conduction coupling electroosmosis well point dewatering | |
| US6596142B2 (en) | Electro-thermal dynamic stripping process | |
| CN115055498B (en) | In-situ remediation system and method for organic contaminated soil and underground water | |
| CN115069754B (en) | Electrode well structure and repair system for in-situ thermal desorption-electrocatalytic oxidation | |
| CN115072819B (en) | Intelligent electrode well control system and repair system for in-situ thermal desorption-electrocatalytic oxidation | |
| CN103835687A (en) | Method and device for controlling SAGD well steam injection flow | |
| CN206945497U (en) | A kind of automatic drilling water injection test instrument | |
| CN105259260B (en) | A kind of transformer oil chromatographic on-Line Monitor Device with triple valve | |
| CN217700631U (en) | Contaminated soil and groundwater remediation simulation system coupling heat conduction and steam injection | |
| CN106655828A (en) | Ion purifier, and control method and apparatus thereof | |
| CN203679188U (en) | Online casting refining system | |
| CN105945063B (en) | A kind of online water replanishing device and its method maintaining Electrokinetic Remediation of Polluted Soils efficiency | |
| CN215543679U (en) | Peculiar smell material normal position clearing device | |
| CN2251044Y (en) | Petroleum production aid | |
| CN105806992B (en) | Reusable three-dimensional large scale burns experimental provision | |
| CN104632116A (en) | Method for judging salvage opportunity of down hole chock | |
| CN211888397U (en) | Contaminated soil electric heat conduction in-situ thermal desorption repair system | |
| CN109647872B (en) | Soil in-situ thermal remediation sandbox simulation system and method | |
| CN220056422U (en) | Circulation well system for removing volatile organic pollutants in soil and underground water | |
| CN206858215U (en) | A kind of separator of energy oil-water separation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |