Automatic multiphase extraction and separation system for polluted site

Abstract

The invention provides a polluted site automatic multiphase extraction and separation system which comprises a solid phase separation device, a gas phase separation device, an NAPL phase separation device, vacuum pumping equipment, a VOC treatment device and a control cabinet. Sediment containing adsorbed organic matter, gas containing volatile organic matter, water containing soluble organic matter, light non-aqueous phase liquid (LNAPL) and heavy non-aqueous phase liquid (DNAPL) are separated. According to the invention, multiphase extraction and multiphase separation are integrated, and extraction and separation can be synchronously realized, so that the remediation efficiency of organic pollution of soil and the pollutant treatment efficiency are remarkably improved; the system has an automatic control program, can automatically carry out extraction and separation operation, runs stably for a long time, is simple and convenient to operate, has low requirements on the technical level of operators, and is beneficial to popularization and application of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation of contaminated sites, and in particular to an automated multiphase extraction and separation system for contaminated sites. Background Art

[0002] The accelerated advancement of urbanization and the rapid development of the chemical industry have produced a large amount of organic waste, resulting in an increase in the number of contaminated sites year by year. Therefore, efficient contaminated site remediation technology is urgently needed. Soil organic pollutants are mainly divided into volatile organic compounds (VOC), dissolved organic matter (DOM), adsorbed organic matter and non-aqueous phase liquids (NAPL), among which NAPL can be divided into light non-aqueous phase liquids (LNAPL) and heavy non-aqueous phase liquids (DNAPL) according to density. At present, the remediation technologies for contaminated sites are mainly multiphase extraction, chemical oxidation, solidification stabilization, biodegradation, etc. Among them, multiphase extraction technology uses a vacuum method to extract underground contaminated water, gas and NAPL to the ground to reduce the content of organic pollutants in soil and groundwater. Multiphase extraction technology has been widely used due to its ability to quickly control and simultaneously repair underground pollution. At present, my country's multiphase extraction equipment is in the initial stage of development. The existing multiphase extraction equipment can usually only extract underground pollutants and transport them to hazardous waste treatment institutions, and it is difficult to achieve on-site separation and treatment. In addition, the operation process of the existing multiphase extraction equipment is complicated, and usually requires a high level of technical skills and proficiency of the operator, and cannot achieve automatic and stable operation. Therefore, the development of stable and efficient multiphase extraction equipment to respond to the country's pollution site governance needs is of great significance to environmental protection and resident safety. Summary of the invention

[0003] In view of the shortcomings of existing multiphase extraction equipment, the present invention provides an automated multiphase extraction and separation system for contaminated sites.

[0004] The technical solution of the present invention:

[0005] An automated multiphase extraction and separation system for contaminated sites, comprising: a solid phase separation device a, a gas phase separation device b, a NAPL phase separation device c, a vacuum exhaust device d, a VOC treatment device e and a control cabinet f, wherein:

[0006] The solid phase separation device a is used to separate the sediment containing adsorbed organic matter in the extract, and the extract after the sediment is separated is transported to the gas phase separation device b;

[0007] The gas phase separation device b is used to separate the gas containing volatile organic matter in the extract, and the water and non-aqueous phase liquid NAPL containing dissolved organic matter are pumped into the NAPL phase separation device c;

[0008] The NAPL phase separation device c is used to separate water containing dissolved organic matter, light non-aqueous phase liquid LNAPL and heavy non-aqueous phase liquid DNAPL;

[0009] The vacuum extraction equipment d provides negative pressure for the multiphase extraction construction, extracts the gas containing volatile organic compounds in the tank of the gas phase separation device b, and purifies it after being discharged by the VOC treatment device e;

[0010] The control cabinet f is connected to the solid phase separation device a, the gas phase separation device b, the NAPL phase separation device c, and the vacuum pumping equipment d, and is used to realize the automated operation of the multi-phase extraction and separation operation.

[0011] Due to the adoption of the above scheme, the beneficial effects of the present invention are:

[0012] 1. The automated multiphase extraction and separation system for contaminated sites of the present invention integrates multiphase extraction and multiphase separation, and can realize extraction and separation simultaneously, thereby significantly improving the remediation efficiency of soil organic pollution and the pollutant treatment efficiency.

[0013] 2. In order to separate the extracts, solid phase separation devices, gas phase separation devices and NAPL phase separation devices were developed to separate the sediment containing adsorbed organic matter, the gas containing volatile organic matter, the water containing dissolved organic matter, LNAPL and DNAPL for further processing.

[0014] 3. The system has an automated control program that can automatically perform extraction and separation operations, operate stably for a long time, is simple and convenient to operate, and has low requirements on the technical level of the operator, which is conducive to the promotion and application of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the system structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the process flow of the system of the present invention.

[0017] Figure 3 It is a schematic diagram of the overall three-dimensional structure of the system of the present invention.

[0018] Figure 4 It is a schematic diagram of the system structure decomposition of the present invention.

[0019] Figure 5 This is one of the schematic diagrams of the appearance structure of the solid phase separation device.

[0020] Figure 6 This is the second schematic diagram of the appearance structure of the solid phase separation device.

[0021] Figure 7 Schematic diagram of the internal structure of the solid phase separation device.

[0022] Figure 8 Schematic diagram of the gas phase separation device structure.

[0023] Fig. 9 Schematic diagram of the internal structure of the NAPL phase separation device.

[0024] Fig.10 Schematic diagram of the rotating structure assembly in the NAPL phase separation device.

[0025] Fig.11 A cross-sectional view of the rotating structure in the NAPL phase separation device.

[0026] Fig.12 for Fig.11 Schematic diagram of the cross-sectional structure in A-A', B-B', C-C', D-D', E-E', and F-F' directions.

[0027] Fig.13 This is the automatic control flow chart of the solid phase separation device.

[0028] Fig.14 This is the automatic control flow chart of the gas phase separation device.

[0029] Fig.15 This is the automatic control flow chart of the NAPL phase separation device.

[0030] Fig.16 This is the automatic control flow chart of the vacuum pumping equipment.

[0031] Reference numerals:

[0032] Solid phase separation device a, including: extract inlet a-1, solid phase separation equipment housing a-2, first filter screen a-3-1, second filter screen a-3-2, third filter screen a-3-3, fourth filter screen a-3-4, flow meter a-4, first solid phase separation electric control valve a-5-1, second solid phase separation electric control valve a-5-2, third solid phase separation electric control valve a-5-3, fourth solid phase separation electric control valve a-5-4, solid phase separation level meter a-6, water spray pipe a-7, spiral blade a-8, solid phase separation motor a-9, solid phase separation belt a-10, solid phase separation outlet a-11;

[0033] Gas phase separation device b, including: gas phase separation inlet b-1, gas phase separation tank b-2, gas phase separation electric control valve b-3, air pressure sensor b-4, gas phase separation level gauge b-5, gas outlet b-6, centrifugal pump b-7, check valve b-8, liquid outlet b-9;

[0034] NAPL phase separation device c, including: mixed liquid inlet c-1, equipment housing c-2, NAPL phase separation motor c-3, NAPL phase separation belt c-4, rotating structure c-5, separation pipe c-6, first NAPL phase separation electric control valve c-7-1, second NAPL phase separation electric control valve c-7-2, third NAPL phase separation electric control valve c-7-3, water outlet c-8, LNAPL outlet c-9, DNAPL outlet c-10, first electrode group c-11-1, second electrode group c-11-2, third electrode group c-11-3, first power supply slip ring c-12-1, second power supply slip ring c-12-2, third power supply slip ring c-12-3, rotating shaft center c-13, wherein the rotating The rotating structure c-5 includes: a bearing c-5-1, a rotating shell c-5-2, a rotating blade c-5-3, a first bottom plate c-5-4, a first center circular hole c-5-4-1, an arc-shaped opening c-5-4-2, a first circular opening c-5-4-3, a second bottom plate c-5-5, a second center circular hole c-5-5-1, a groove c-5-5-2, a second circular opening c-5-5-3, a third bottom plate c-5-6, a third center circular hole c-5-6-1, a rectangular groove c-5-6-2, a centrifugal zone inlet c-5-7, a first flow channel c-5-8, a second flow channel c-5-9, a third flow channel c-5-10, a first connecting pipe c-5-11, a second connecting pipe c-5-12, and a third connecting pipe c-5-13;

[0035] Vacuum pumping equipment d, wherein: gas inlet d-1;

[0036] VOC treatment device e;

[0037] Control cabinet f. DETAILED DESCRIPTION

[0038] The technical solution provided by the present application will be further described below in conjunction with specific embodiments and accompanying drawings. The advantages and features of the present application will become more apparent with the following description.

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, an automated multiphase extraction and separation system for contaminated sites includes: a solid phase separation device a, a gas phase separation device b, a NAPL phase separation device c, a vacuum exhaust device d, a VOC treatment device e and a control cabinet f, wherein:

[0040] The solid phase separation device a is used to separate the sediment containing adsorbed organic matter in the extract, and the extract after the sediment is separated is transported to the gas phase separation device b;

[0041] The gas phase separation device b is used to separate the gas containing volatile organic matter in the extract, and the water and non-aqueous phase liquid (NAPL) containing dissolved organic matter are pumped into the NAPL phase separation device c;

[0042] The NAPL phase separation device c is used to separate water containing dissolved organic matter, light non-aqueous phase liquid (LNAPL) and heavy non-aqueous phase liquid (DNAPL);

[0043] The vacuum extraction equipment d provides negative pressure for the multiphase extraction construction, extracts the gas containing volatile organic compounds in the tank of the gas phase separation device b, and purifies it after being discharged by the VOC treatment device e;

[0044] The control cabinet f is connected to the solid phase separation device a, the gas phase separation device b, the NAPL phase separation device c, and the vacuum pumping equipment d, and is used to realize the automated operation of the multi-phase extraction and separation operation.

[0045] The solid phase separation device a is used to separate the sediment containing adsorbed organic matter in the extract, and includes: an extract inlet a-1, a solid phase separation device housing a-2, a filter screen, a flow meter a-4, an electric control valve, a solid phase separation level meter a-6, a water spray pipe a-7, a spiral blade a-8, a solid phase separation motor a-9, a solid phase separation belt a-10, and a solid phase separation outlet a-11. Figure 5 , Figure 6 , Figure 7 As shown, where:

[0046] There are four electric control valves, namely the first solid phase separation electric control valve a-5-1, the second solid phase separation electric control valve a-5-2, the third solid phase separation electric control valve a-5-3, and the fourth solid phase separation electric control valve a-5-4; the first solid phase separation electric control valve a-5-1 is arranged on the top of the solid phase separation equipment housing a-2, and is used to adjust the internal air pressure of the solid phase separation device;

[0047] The extract inlet a-1 is arranged on one side of the solid phase separation device housing a-2 and is connected to the extraction well (not shown in the figure);

[0048] The solid phase separation outlet a-11 is arranged on the other side of the solid phase separation equipment housing a-2, and a flow meter a-4 and a second solid phase separation electric control valve a-5-2 are provided at the front end of the solid phase separation outlet a-11 of the gas phase separation device b;

[0049] There are four filter screens, which are the first filter screen a-3-1, the second filter screen a-3-2, the third filter screen a-3-3, and the fourth filter screen a-3-4 in descending order of aperture, and are used for multi-stage filtration of sediment containing adsorbed organic matter. They are uniformly arranged in sequence in the solid phase separation equipment housing a-2, and the first filter screen a-3-1 is adjacent to the extract inlet a-1;

[0050] There are four water spray pipes a-7, which are arranged behind each filter screen. The four water spray pipes a-7 are connected to an external water source through the third solid phase separation electric control valve a-5-3 to spray water to clean the filter screen;

[0051] The spiral blade a-8 is arranged at the bottom of the solid phase separation equipment housing a-2, and a fourth solid phase separation electric control valve a-5-4 is arranged at one end of the spiral blade a-8 for removing sediment, and the other end of the spiral blade a-8 is connected to the output shaft of the solid phase separation motor a-9 through the solid phase separation belt a-10, and the solid phase separation motor a-9 provides rotational power to the spiral blade a-8 through the solid phase separation belt a-10, and the spiral blade a-8 rotates to discharge the washed sediment containing adsorbed organic matter through the fourth solid phase separation electric control valve a-5-4;

[0052] The liquid level meter a-6 is used to monitor the liquid level in the solid phase separation device and is arranged on the side of the solid phase separation equipment housing a-2.

[0053] The gas phase separation device b is used to separate the gas containing volatile organic matter in the extract, and includes: a gas phase separation inlet b-1, a tank body b-2, a gas phase separation electric control valve b-3, a pressure sensor b-4, a gas phase separation level meter b-5, a gas outlet b-6, a centrifugal pump b-7, a check valve b-8, and a liquid outlet b-9. Figure 8 As shown, where:

[0054] The gas phase separation inlet b-1 and the gas outlet b-6 are arranged at the upper end of the tank body b-2, the gas phase separation inlet b-1 is communicated with the solid phase separation outlet a-11 of the solid phase separation device a, the gas outlet b-6 is communicated with the gas inlet of the vacuum pumping equipment d, and the liquid outlet b-9 is communicated with the mixed liquid inlet c-1 of the c-NAPL phase separation device;

[0055] The gas phase separation electric control valve b-3 is arranged on the upper side of the tank b-2 and is used to adjust the gas pressure inside the tank;

[0056] The air pressure sensor b-4 is arranged on the upper side of the tank b-2 and is used to monitor the air pressure inside the tank;

[0057] The gas phase separation level meter b-5 is arranged on the side of the tank b-2 and is used to monitor the liquid level in the tank;

[0058] The bottom of the tank body b-2 is connected to the inlet of the centrifugal pump b-7 through a pipeline, and the outlet of the centrifugal pump b-7 is connected to the liquid outlet b-9. A check valve b-8 is provided between the outlet of the centrifugal pump b-7 and the liquid outlet b-9. The liquid passes through the check valve b-8 and is discharged through the liquid outlet b-9. The liquid outlet b-9 is connected to the mixed liquid inlet c-1 of the NAPL phase separation device c. The centrifugal pump b-7 is used to provide power during the discharge process, and the check valve b-8 is used to prevent the liquid from flowing back.

[0059] The NAPL phase separation device c is used to separate water containing dissolved organic matter, light non-aqueous phase liquid (LNAPL) and heavy non-aqueous phase liquid (DNAPL), and includes: a mixed liquid inlet c-1, an equipment housing c-2, a NAPL phase separation motor c-3, a NAPL phase separation belt c-4, a rotating structure c-5, a separation pipe c-6, a first NAPL phase separation electric control valve c-7-1, a second NAPL phase separation electric control valve c-7-2, a third NAPL phase separation electric control valve c-7-3, a water outlet c-8, an LNAPL outlet c-9, a DNAPL outlet c-10, a first electrode group c-11-1, a second electrode group c-11-2, a third electrode group c-11-3, a first power supply slip ring c-12-1, a second power supply slip ring c-12-2, and a third power supply slip ring c-12-3, such as Fig. 9 , Fig.10 , Fig.11 , Fig.12 As shown, where:

[0060] The mixed liquid inlet c-1 is arranged at the upper end of the rotating structure c-5, and the mixed liquid inlet c-1 is connected to the liquid outlet b-9 in the gas phase separation device b;

[0061] The rotating structure c-5 is installed in the equipment housing c-2, the upper part of the rotating structure c-5 is communicated with the mixed liquid inlet c-1, and the lower part is connected to the separation pipe c-6; the rotating structure c-5 is used for high-speed rotation to separate water containing dissolved organic matter, light non-aqueous phase liquid (LNAPL) and heavy non-aqueous phase liquid (DNAPL) from each other, and includes a bearing c-5-1, a rotating housing c-5-2, a rotating blade c-5-3, a first bottom plate c-5-4, a second bottom plate c-5-5, a third bottom plate c-5-6, a first connecting pipe c-5-11, a second connecting pipe c-5-12, and a third connecting pipe c-5- 13; The rotating shell c-5-2 and the first bottom plate c-5-4 are provided with grooves, the lower part of the rotating blade c-5-3 is inserted into the groove of the first bottom plate c-5-4, and the upper part of the rotating blade c-5-3 is inserted into the groove of the rotating shell c-5-2. The rotating shell c-5-2, the rotating blade c-5-3, the first bottom plate c-5-4, the second bottom plate c-5-5 and the third bottom plate c-5-6 are fixed as a whole by bolts, and a centrifugal zone inlet and three independent flow channels are formed inside the rotating structure. Two bearings c-5-1 are respectively installed on the upper and lower parts of the whole, thus forming a rotating structure c-5.

[0062] Furthermore, the rotating structure c-5:

[0063] The rotating shell c-5-2 is a truncated cone structure, narrow at the top and wide at the bottom;

[0064] A centrifugal zone inlet c-5-7 is provided between the top edge of the rotating blade c-5-3 and the rotating housing c-5-2;

[0065] The rotating blade c-5-3 is a grid structure, and a first flow channel c-5-8 and a second flow channel c-5-9 are arranged inside. A third flow channel c-5-10 is arranged between the rotating blade c-5-3 and the side wall of the rotating shell c-5-2. The three flow channels are interconnected in the horizontal direction through the grid of the rotating blade c-5-3.

[0066] The first bottom plate c-5-4: a first circular hole c-5-4-1 is provided in the center, communicating with the first flow channel c-5-8 inside the rotating blade c-5-3; an arc-shaped opening c-5-4-2 is provided in the middle, communicating with the second flow channel c-5-9 inside the rotating blade c-5-3; a first circular opening c-5-4-3 is provided on the edge, communicating with the third flow channel c-5-10 inside the rotating blade c-5-3;

[0067] The second bottom plate c-5-5: a second circular hole c-5-5-1 is provided in the center, and a circle of grooves c-5-5-2 is provided along the second circular hole c-5-5-1, and the grooves c-5-5-2 are opposite to and connected with the arc-shaped opening c-5-4-2 of the first bottom plate c-5-4, and further connected with the second flow channel c-5-9 inside the rotating blade c-5-3; a second circular opening c-5-5-3 is provided on the edge, and the second circular opening c-5-5-3 is connected with the first circular opening c-5-4-3 at the edge of the first bottom plate c-5-4, and further connected with the third flow channel c-5-10 inside the rotating blade c-5-3;

[0068] The third bottom plate c-5-6: a third circular hole c-5-6-1 is provided in the center, and a rectangular groove c-5-6-2 is provided radially outwardly at the edge of the third circular hole c-5-6-1, and the rectangular groove c-5-6-2 is communicated with the circular opening c-5-5-3 at the edge of the second bottom plate c-5-5, and further communicated with the third flow channel c-5-10 inside the rotating blade c-5-3;

[0069] The apertures of the first connecting tube c-5-11, the second connecting tube c-5-12, and the third connecting tube c-5-13 are from small to large, wherein: the first connecting tube c-5-11 is connected to the bottom of the first bottom plate c-5-4 and communicates with the first central circular hole c-5-4-1, the second connecting tube c-5-12 is connected to the bottom of the second bottom plate c-5-5 and communicates with the second central circular hole c-5-5-1, and the third connecting tube c-5-13 is connected to the bottom of the third bottom plate c-5-6 and communicates with the third central circular hole c-5-6-1;

[0070] The above three connecting pipes are nested in sequence and there is a gap between the adjacent inner and outer walls. The connection between the three connecting pipes and the bottom plate is provided with sealing measures. Finally, there are:

[0071] The first connecting pipe c-5-11 is connected in sequence with the first circular hole c-5-4-1 in the center of the first bottom plate c-5-4 and the first flow channel c-5-8 inside the rotating blade c-5-3 to form a complete flow channel, namely, the LNAPL flow channel, for removing the LNAPL;

[0072] The gap between the inner wall of the second connecting pipe c-5-12 and the outer wall of the first connecting pipe c-5-11 forms a flow channel, and is sequentially connected with the second circular hole c-5-5-1 at the center of the second bottom plate c-5-5, the groove c-5-5-2, the arc-shaped opening c-5-4-2 in the middle of the first bottom plate c-5-4, and the second flow channel c-5-9 inside the rotating blade c-5-3, forming a complete flow channel, i.e., a water flow channel, for discharging water containing dissolved organic matter;

[0073] The gap between the inner wall of the third connecting pipe c-5-13 and the outer wall of the second connecting pipe c-5-12 forms a flow channel, and is connected in sequence with the third circular hole c-5-6-1 in the center of the third bottom plate c-5-6, the rectangular groove c-5-6-2, the second circular opening c-5-5-3 at the edge of the second bottom plate c-5-5, the first circular opening c-5-4-3 at the edge of the first bottom plate c-5-4, and the third flow channel c-5-10 inside the rotating blade c-5-3 to form a complete flow channel, namely, the DNAPL flow channel, for discharging the DNAPL.

[0074] The separation pipe c-6 includes three channel outlets, which are respectively connected to the three complete flow channels (LNAPL flow channel, water, and DNAPL flow channel) of the rotating structure c-5, and then the separation pipe c-6 is divided into three outputs: LNAPL is discharged downward through the separation pipe c-6, and is discharged from the LNAPL outlet c-9 through the second NAPL phase separation electric control valve c-7-2; water containing dissolved organic matter is discharged to the right through the separation pipe c-6, and is discharged from the water outlet c-8 through the first NAPL phase separation electric control valve c-7-1; DNAPL is discharged to the left through the separation pipe c-6, and is discharged from the DNAPL outlet c-10 through the third NAPL phase separation electric control valve c-7-3;

[0075] The first electrode group c-11-1, the second electrode group c-11-2, and the third electrode group c-11-3 are respectively arranged on the first bottom plate c-5-4, the second bottom plate c-5-5, and the third bottom plate c-5-6, and are used to measure the liquid resistivity to monitor the separation purity (LNAPL and DNAPL have high resistivity, and water containing dissolved organic matter has low resistivity). The three groups of electrodes are respectively powered by three groups of power supply slip rings, namely the first power supply slip ring c-12-1, the second power supply slip ring c-12-2, and the third power supply slip ring c-12-3; as an embodiment, the first power supply slip ring c-12-1 is arranged between the outer wall of the first connecting pipe c-5-11 and the inner wall of the separation pipe c-6, the second power supply slip ring c-12-2 is arranged between the outer wall of the second connecting pipe c-5-12 and the inner wall of the separation pipe c-6, and the third power supply slip ring c-12-3 is arranged between the outer wall of the first connecting pipe c-5-13 and the separation pipe c-6;

[0076] The NAPL phase separation motor c-3 is arranged in the equipment housing c-2, and its output shaft is connected to the rotating structure c-5 through the NAPL phase separation belt c-4. The NAPL phase separation motor c-3 provides power to the rotating structure c-5 through the NAPL phase separation belt c-4.

[0077] The principle of flow separation between water and NAPL is:

[0078] After water and NAPL enter the rotating structure c-5 through the mixed liquid inlet c-1, the mixed liquid enters the centrifugal zone at the bottom of the rotating blade c-5-3 through the centrifugal zone inlet c-5-7 at the top edge of the rotating blade c-5-3. The NAPL phase separation motor c-3 provides power to make the rotating structure c-5 rotate at high speed. The mixed liquid inside the centrifugal zone is driven by the rotating blade c-5-3 to rotate at high speed. Since the density of LNAPL is less than that of water, the LNAPL in the mixed liquid will transfer to the center of the rotating axis c-13, that is, the LNAPL will transfer to the first flow channel c-5-8 through the grille of the rotating blade c-5-3. Similarly, due to DNAP L density is greater than that of water, and DNAPL in the mixed liquid will move away from the center of the rotating axis c-13, that is, LNAPL will be transferred to the third flow channel c-5-10 through the grille of the rotating blade c-5-3, and water will be located between LNAPL and DNAPL. Therefore, LNAPL, DNAPL and water are separated, and from the center of the rotating axis c-13 to the outside, they are LNAPL, water, and DNAPL in order. The inclined side wall of the rotating shell c-5-2 helps DNAPL to gather at the outer edge of the bottom of the centrifugal zone. The center of the rotating blade c-5-3 has a conical structure with the top of the cone facing downward, which helps LNAPL to gather at the center of the rotating axis at the bottom of the centrifugal zone.

[0079] Compared with water, LNAPL and DNAPL have higher resistivity. The resistivity of LNAPL at its position is monitored by the first electrode group c-11-1. When the resistivity reaches the resistivity setting threshold for separating LNAPL, the second NAPL phase separation electric control valve c-7-2 opens, and LNAPL passes through the LNAPL flow channel and is discharged from the LNAPL outlet c-9; similarly, the resistivity of DNAPL is monitored by the third electrode group c-11-3. When the resistivity reaches the resistivity setting threshold for separating DNAPL, the third NAPL phase separation electric control valve c-7-3 opens, and DNAPL passes through the DNAPL flow channel and is discharged from the DNAPL outlet c-10; the resistivity of water is monitored by the second electrode group c-11-2. When the resistivity reaches the resistivity setting threshold for separating water, the first NAPL phase separation electric control valve c-7-1 opens, and water containing dissolved organic matter passes through the water flow channel and is discharged from the water outlet c-8.

[0080] The vacuum pumping equipment d provides negative pressure for multiphase extraction construction, and includes a gas inlet d-1 and a gas outlet. The gas inlet d-1 is connected to the gas outlet b-6 of the gas phase separation device b, and the gas outlet is connected to the VOC treatment device e. The vacuum pumping equipment d extracts the gas containing volatile organic compounds in the tank b-2 of the gas phase separation device b, and discharges it after purification by the VOC treatment device e.

[0081] The control cabinet f realizes the automatic operation of multiphase extraction and separation operation, is connected with the solid phase separation device a, the gas phase separation device b, the NAPL phase separation device c, and the vacuum pumping device d, obtains the information of the flow meter, the liquid level meter, the air pressure sensor and the electrode group, and operates the electric control valve, the motor, the centrifugal pump and the vacuum pumping device d. Specifically:

[0082] The control cabinet f is connected to the flow meter a-4, solid phase separation liquid level meter a-6, electric control valves (the first solid phase separation electric control valve a-5-1, the second solid phase separation electric control valve a-5-2, the third solid phase separation electric control valve a-5-3, the fourth solid phase separation electric control valve a-5-4) and the solid phase separation motor a-9 of the solid phase separation device a, obtains the extraction flow rate detected by the flow meter a-4 and the liquid level detected by the solid phase separation liquid level meter a-6, controls the electric control valves and the solid phase separation motor a-9 to automatically clean the sediment on the filter screen. The specific automatic control process is as follows: Fig.13 As shown;

[0083] When the extraction operation starts, the states of each electric-controlled valve and the solid-phase separation motor a-9 are controlled as follows: the second solid-phase separation electric-controlled valve a-5-2 is opened, the first solid-phase separation electric-controlled valve a-5-1, the third solid-phase separation electric-controlled valve a-5-3, and the fourth solid-phase separation electric-controlled valve a-5-4 are closed, and the solid-phase separation motor a-9 is stopped; at this time, the liquid in the solid-phase separation device a is discharged through the solid-phase separation outlet a-11 and transported to the gas phase separation device b, and the extraction flow rate is monitored by the flow meter a-4;

[0084] During the extraction operation, when the flow meter a-4 detects that the extraction flow rate is lower than the set flow rate threshold, a cleaning process is performed, and the cleaning process is as follows:

[0085] Open the first solid phase separation electric control valve a-5-1 to return the inside of the solid phase separation device a to normal pressure. At this time, water, air and NAPL continue to slowly enter the gas phase separation device b. The liquid level is monitored by the solid phase separation liquid level meter a-6. When the liquid level is lower than the set solid phase separation liquid level threshold, close the second solid phase separation electric control valve a-5-2, open the third solid phase separation electric control valve a-5-3 and the fourth solid phase separation electric control valve a-5-4, and spray water from the external water source to the filter screen through the water spray pipe a-7 to wash the sediment. The solid phase separation motor a-9 starts During operation, the mud and sand containing adsorbed organic matter are discharged through the opening of the fourth solid-phase separation electric-controlled valve a-5-4 by means of the spiral blade a-8. When the flushing time reaches the set flushing time, the third solid-phase separation electric-controlled valve a-5-3 and the fourth solid-phase separation electric-controlled valve a-5-4 are closed, and the solid-phase separation motor a-9 stops running, thus ending the cleaning process. After the cleaning process, if it is necessary to continue the extraction operation, the states of each electric-controlled valve and the solid-phase separation motor a-9 are controlled to be the states at the beginning of the above-mentioned extraction operation, and the extraction operation is continued.

[0086] The control cabinet f is connected to the gas phase separation level gauge b-5, the air pressure sensor b-4, the gas phase separation electric control valve b-3, and the centrifugal pump b-7 of the gas phase separation device b, obtains the air pressure data of the air pressure sensor b-4 and the liquid level height detected by the gas phase separation level gauge b-5, controls the gas phase separation electric control valve b-3 to adjust the air pressure in the tank body b-2, and controls the operation of the centrifugal pump b-7 to pump the water and NAPL in the tank body b-2 to the NAPL phase separation device c. The specific automatic control process is as follows: Fig.14 As shown;

[0087] When the extraction operation starts, the centrifugal pump b-7 stops, the NAPL phase separation device c stops, and the liquid level in the tank b-2 is monitored by the gas phase separation level gauge b-5; when the liquid level is higher than the set upper limit of the gas phase separation level range, the NAPL phase separation process starts, the centrifugal pump b-7 runs, and the NAPL phase separation device c runs synchronously; when the gas phase separation level gauge b-5 monitors that the liquid level in the tank b-2 is lower than the set lower limit of the gas phase separation level range or the extraction operation needs to be stopped, the centrifugal pump b-7 stops, the NAPL phase separation device c stops, and the NAPL phase separation process ends.

[0088] The control cabinet f is connected to the electrode group (the first electrode group c-11-1, the second electrode group c-11-2, the third electrode group c-11-3), the electric control valve (the first NAPL phase separation electric control valve c-7-1, the second NAPL phase separation electric control valve c-7-2, the third NAPL phase separation electric control valve c-7-3), and the NAPL phase separation motor c-3 of the NAPL phase separation device c to obtain the resistivity information of the electrode group, and control the electric control valve and the NAPL phase separation motor c-3 to achieve the mutual separation of water containing dissolved organic matter, light non-aqueous phase liquid (LNAPL) and heavy non-aqueous phase liquid (DNAPL). The specific automatic control process is as follows: Fig.15 As shown;

[0089] When the NAPL phase separation process begins, the NAPL phase separation motor c-3 starts to run, the first NAPL phase separation electric control valve c-7-1, the second NAPL phase separation electric control valve c-7-2, and the third NAPL phase separation electric control valve c-7-3 are closed, and the resistivity is monitored by the first electrode group c-11-1, the second electrode group c-11-2, and the third electrode group c-11-3;

[0090] When the first electrode group c-11-1 detects that the resistivity reaches the resistivity setting threshold for separating LNAPL, the second NAPL phase separation electric control valve c-7-2 opens to discharge the LNAPL;

[0091] When the third electrode group c-11-3 detects that the resistivity reaches the resistivity setting threshold for separating DNAPL, the third NAPL phase separation electric control valve c-7-3 opens to discharge the DNAPL;

[0092] When the second electrode group c-11-2 detects that the resistivity reaches the set resistivity threshold of the separated water, the first NAPL phase separation electric control valve c-7-1 opens to discharge the water containing dissolved organic matter;

[0093] If the NAPL phase separation process is ended, the NAPL phase separation motor c-3 stops running, and the first NAPL phase separation electrically controlled valve c-7-1, the second NAPL phase separation electrically controlled valve c-7-2, and the third NAPL phase separation electrically controlled valve c-7-3 are closed.

[0094] The control cabinet f is connected to the vacuum pumping equipment d to control the operation of the vacuum pumping equipment. The specific automatic control process is as follows: Fig.16 As shown;

[0095] Before the extraction operation begins, set the extraction negative pressure range in the control cabinet. The pressure is a negative value, including the lower limit and upper limit of the air pressure range. Adjust the extraction negative pressure to be lower than the upper limit of the set air pressure range through the vacuum pumping equipment d, and adjust the extraction negative pressure to be greater than the lower limit of the set air pressure range through the gas phase separation electric control valve b-3.

[0096] When the extraction operation begins, the vacuum pumping equipment d starts to run, the gas phase separation electric control valve b-3 is closed, and the air pressure in the tank b-2 is monitored by the air pressure sensor b-4. When the air pressure in the tank b-2 is lower than the upper limit of the set air pressure range, the vacuum pumping equipment d stops running; if the air pressure in the tank b-2 is lower than the lower limit of the set air pressure range, the gas phase separation electric control valve b-3 opens, and the air pressure is increased until it is greater than the lower limit of the set air pressure range, and then it is determined whether to end the extraction operation. If the extraction operation is not ended, the gas phase separation electric control valve b-3 is closed, and the air pressure sensor b-4 is returned to monitor the air pressure status in the tank b-2. If the extraction operation is ended, the program ends.

[0097] Furthermore, the control cabinet is provided with a touch screen, and the touch screen is provided with buttons such as parameter setting, start extraction, and end extraction for human-computer interaction.

[0098] The method for using the above-mentioned automated multiphase extraction and separation system for contaminated sites comprises the following steps:

[0099] Step 1: Install the system and set parameters through the control cabinet touch screen.

[0100] Step 2: Start extraction. Click the start extraction button on the touch screen of the control cabinet to automatically perform multiphase extraction and separation operations. The extraction ends after the extraction operation is completed.

[0101] Step 3: End extraction. Click the End Extraction button on the touch screen of the control cabinet, the system stops running and automatically releases the extraction negative pressure.

[0102] When in use, the extract inlet a-1 of the solid phase separation device a is connected to the extraction well, and multiple extraction wells can be connected at the same time; the third solid phase separation electric control valve a-5-3 is connected to an external water source.

[0103] Before the multiphase extraction and separation operation begins, the states of each electric-controlled valve are set as follows: the first solid-phase separation electric-controlled valve a-5-1, the third solid-phase separation electric-controlled valve a-5-3, and the fourth solid-phase separation electric-controlled valve a-5-4 of the solid-phase separation device a are closed, and the second solid-phase separation electric-controlled valve a-5-2 is opened; the gas phase separation electric-controlled valve b-3 of the gas phase separation device b is closed; the first NAPL phase separation electric-controlled valve c-7-1, the second NAPL phase separation electric-controlled valve c-7-2, and the third NAPL phase separation electric-controlled valve c-7-3 of the NAPL phase separation device c are closed.

[0104] Specifically, in step 1, parameters are set through the touch screen of the control cabinet, including the extraction negative pressure range (lower limit of the air pressure range, upper limit of the air pressure range), flow rate threshold, solid phase separation level threshold, cleaning time, gas phase separation level range (lower limit of the gas phase separation level range, upper limit of the gas phase separation level range), resistivity threshold for separating LNAPL, resistivity threshold for separating DNAPL, resistivity threshold for separating water, etc.

[0105] After setting the parameters in the control cabinet f, click the start extraction button on the touch screen and the system will start the extraction work.

[0106] Specifically, the step 2 includes:

[0107] 2.1: The vacuum suction device d is in operation to extract the air in the tank b-2 of the gas phase separation device b to reach the set extraction negative pressure range. Under the action of the vacuum pressure, the extract containing pollutants such as water, air, sediment and NAPL in the extraction well is sucked into the extract inlet a-1 of the solid phase separation device a.

[0108] 2.2: After the extract passes through multi-stage filtration of filters with decreasing pore sizes in the solid phase separation device a (the first filter a-3-1, the second filter a-3-2, the third filter a-3-3, and the fourth filter a-3-4), the sediment containing adsorbed organic matter remains on the filter, and water, air and NAPL enter the gas phase separation device b.

[0109] After the equipment has been running for a certain period of time, the filter screen is blocked by sediment, making it difficult for water, air and NAPL to pass through, and the extraction flow rate decreases. When the flow meter a-4 detects that the extraction flow rate is lower than the set flow rate threshold, it starts to automatically clean the sediment on the filter screen.

[0110] 2.3: After the pollutant-containing water, air and NAPL enter the gas phase separation device b through the gas phase separation inlet b-1, the water and NAPL are located in the lower part of the tank b-2, and the upper air is extracted by the vacuum exhaust equipment d through the gas outlet b-6 and discharged into the VOC treatment device e, and discharged after purification;

[0111] When the gas phase separation level meter b-5 detects that the liquid level in the tank b-2 reaches the upper limit of the set gas phase separation level range, the centrifugal pump b-7 and the NAPL phase separation device c start to operate to separate the LNAPL, DNAPL and water.

[0112] Specifically, in step 3, after the extraction operation is completed, click the end extraction button on the touch screen of the control cabinet f, the system stops running and automatically opens the gas phase separation electric control valve b-3, so that the inside of the tank body b-2 returns to normal pressure.

[0113] The above description is only a description of the preferred embodiments of the present application, and is not intended to limit the scope of the present application. Any changes or modifications made by any person skilled in the art based on the above disclosed technical contents shall be deemed as equivalent effective embodiments and shall fall within the scope of protection of the technical solution of the present application.

Claims

1. An automated multiphase extraction and separation system for contaminated sites, characterized in that: include: Solid phase separation device (a), gas phase separation device (b), NAPL phase separation device (c), vacuum pumping equipment (d), VOC treatment device (e) and control cabinet (f), wherein: The solid phase separation device (a) is used to separate the sediment containing adsorbed organic matter in the extract, and the extract after the sediment is separated is transported to the gas phase separation device (b); The gas phase separation device (b) is used to separate the gas containing volatile organic matter in the extract, and the water and non-aqueous phase liquid NAPL containing dissolved organic matter are pumped into the NAPL phase separation device (c); The NAPL phase separation device (c) is used to separate water and non-aqueous phase liquid NAPL containing dissolved organic matter into water, light non-aqueous phase liquid LNAPL and heavy non-aqueous phase liquid DNAPL; The vacuum extraction equipment (d) provides negative pressure for the multiphase extraction operation, extracts the gas containing volatile organic compounds in the tank of the gas phase separation device (b), and the extracted gas is purified by the VOC treatment device (e) before being discharged; The control cabinet (f) is connected to the solid phase separation device (a), the gas phase separation device (b), the NAPL phase separation device (c), and the vacuum pumping equipment (d) to realize the automated operation of the multi-phase extraction and separation operation.

2. The automated multiphase extraction and separation system for contaminated sites according to claim 1, characterized in that: The solid phase separation device (a) comprises: an extract inlet (a-1), a solid phase separation device housing (a-2), a filter screen, a flow meter (a-4), an electric control valve, a solid phase separation level meter (a-6), a water spray pipe (a-7), a spiral blade (a-8), a solid phase separation motor (a-9), a solid phase separation belt (a-10), and a solid phase separation outlet (a-11), wherein: There are four electric control valves, namely the first solid phase separation electric control valve (a-5-1), the second solid phase separation electric control valve (a-5-2), the third solid phase separation electric control valve (a-5-3), and the fourth solid phase separation electric control valve (a-5-4); the first solid phase separation electric control valve (a-5-1) is arranged on the top of the solid phase separation equipment housing (a-2) and is used to adjust the internal air pressure of the solid phase separation device; The extract inlet (a-1) is arranged on one side of the solid phase separation device housing (a-2) and is connected to the extraction well; The solid phase separation outlet (a-11) is arranged on the other side of the solid phase separation equipment housing (a-2), and a flow meter (a-4) and a second solid phase separation electric control valve (a-5-2) are provided at the front end of the solid phase separation outlet of the gas phase separation device (b); There are four filter screens, which are respectively the first filter screen (a-3-1), the second filter screen (a-3-2), the third filter screen (a-3-3), and the fourth filter screen (a-3-4) in descending order of aperture, and are used for multi-stage filtration of sediment containing adsorbed organic matter, and are uniformly arranged in sequence in the housing (a-2) of the solid phase separation device, and the first filter screen (a-3-1) is adjacent to the extract inlet (a-1); There are four water spray pipes (a-7), which are arranged behind each filter screen respectively. The four water spray pipes (a-7) are connected to an external water source through a third solid phase separation electric control valve (a-5-3) to spray water to clean the filter screen; The spiral blade (a-8) is arranged at the bottom of the solid phase separation equipment housing (a-2), one end of the spiral blade (a-8) is provided with a fourth solid phase separation electric control valve (a-5-4) for removing sediment, the other end of the spiral blade (a-8) is connected to the output shaft of the solid phase separation motor (a-9) through a solid phase separation belt (a-10), the solid phase separation motor (a-9) provides rotational power to the spiral blade (a-8) through the solid phase separation belt (a-10), and the spiral blade (a-8) rotates to discharge the washed sediment containing adsorbed organic matter through the fourth solid phase separation electric control valve (a-5-4); The liquid level meter (a-6) is used to monitor the liquid level in the solid phase separation device and is arranged on the side of the solid phase separation device housing (a-2); The flow meter (a-4), solid phase separation level meter (a-6), first solid phase separation electric control valve (a-5-1), second solid phase separation electric control valve (a-5-2), third solid phase separation electric control valve (a-5-3), fourth solid phase separation electric control valve (a-5-4) and solid phase separation motor (a-9) of the solid phase separation device (a) are all connected to the control cabinet (f).

3. The automated multiphase extraction and separation system for contaminated sites according to claim 1, characterized in that: The gas phase separation device (b) comprises: a gas phase separation inlet (b-1), a tank body (b-2), a gas phase separation electric control valve (b-3), a pressure sensor (b-4), a gas phase separation level gauge (b-5), a gas outlet (b-6), a centrifugal pump (b-7), a check valve (b-8), and a liquid outlet (b-9), wherein: A gas phase separation inlet (b-1) and a gas outlet (b-6) are arranged at the upper end of the tank body (b-2), the gas phase separation inlet (b-1) is communicated with the solid phase separation outlet of the solid phase separation device (a), and the gas outlet (b-6) is communicated with the gas inlet of the vacuum pumping device (d); The gas phase separation electric control valve (b-3) is arranged on the upper side of the tank body (b-2) and is used to adjust the gas pressure inside the tank body; The air pressure sensor (b-4) is arranged on the upper side of the tank body (b-2) and is used to monitor the air pressure inside the tank body; The gas phase separation liquid level meter (b-5) is arranged on the side of the tank body (b-2) and is used to monitor the liquid level in the tank body; The bottom of the tank body (b-2) is connected to the inlet of the centrifugal pump (b-7) through a pipeline, the outlet of the centrifugal pump (b-7) is connected to the liquid outlet (b-9), a check valve (b-8) is provided between the outlet of the centrifugal pump (b-7) and the liquid outlet (b-9), the liquid outlet (b-9) is connected to the mixed liquid inlet of the NAPL phase separation device (c), the centrifugal pump (b-7) is used to provide power during the discharge process, and the check valve (b-8) is used to prevent the liquid from flowing back; The gas phase separation electric control valve (b-3), gas phase separation level meter (b-5), air pressure sensor (b-4) and centrifugal pump (b-7) of the gas phase separation device (b) are all connected to the control cabinet (f).

4. The automated multiphase extraction and separation system for contaminated sites according to claim 1, characterized in that: The NAPL phase separation device (c) comprises: a mixed liquid inlet (c-1), an equipment housing (c-2), a NAPL phase separation motor (c-3), a NAPL phase separation belt (c-4), a rotating structure (c-5), a separation pipe (c-6), a first NAPL phase separation electric control valve (c-7-1), a second NAPL phase separation electric control valve (c-7-2), a third NAPL phase separation electric control valve (c-7-3), a water outlet (c-8), an LNAPL outlet (c-9), a DNAPL outlet (c-10), a first electrode group (c-11-1), a second electrode group (c-11-2), a third electrode group (c-11-3), a first power supply slip ring (c-12-1), a second power supply slip ring (c-12-2), and a third power supply slip ring (c-12-3), wherein: The mixed liquid inlet (c-1) is arranged at the upper end of the rotating structure (c-5), and the mixed liquid inlet (c-1) is connected to the liquid outlet of the gas phase separation device (b); The rotating structure (c-5) is installed in the equipment housing (c-2); the upper part of the rotating structure (c-5) is communicated with the mixed liquid inlet (c-1), and the lower part is connected with the separation pipe (c-6); the rotating structure (c-5) includes a bearing (c-5-1), a rotating housing (c-5-2), a rotating blade (c-5-3), a first bottom plate (c-5-4), a second bottom plate (c-5-5), a third bottom plate (c-5-6), a first connecting pipe (c-5-11), a second connecting pipe (c-5-12), and a third connecting pipe (c-5-13); the rotating housing (c-5-2) and the first bottom plate (c-5- 4) A groove is provided, the lower part of the rotating blade (c-5-3) is inserted into the groove of the first bottom plate (c-5-4), and the upper part of the rotating blade (c-5-3) is inserted into the groove of the rotating shell (c-5-2). The rotating shell (c-5-2), the rotating blade (c-5-3), the first bottom plate (c-5-4), the second bottom plate (c-5-5) and the third bottom plate (c-5-6) are fixed as a whole by bolts, and a centrifugal zone inlet and three independent flow channels are formed inside the rotating structure. Two bearings (c-5-1) are respectively installed on the upper and lower parts of the whole, so as to form a rotating structure (c-5); The separation pipe (c-6) is divided into three outputs: LNAPL is discharged downward through the separation pipe (c-6) and discharged from the LNAPL outlet (c-9) through the second NAPL phase separation electric control valve (c-7-2); water containing dissolved organic matter is discharged to the right through the separation pipe (c-6) and discharged from the water outlet (c-8) through the first NAPL phase separation electric control valve (c-7-1); DNAPL is discharged to the left through the separation pipe (c-6) and discharged from the DNAPL outlet (c-10) through the third NAPL phase separation electric control valve (c-7-3); The first electrode group (c-11-1), the second electrode group (c-11-2), and the third electrode group (c-11-3) are respectively arranged on the first bottom plate (c-5-4), the second bottom plate (c-5-5), and the third bottom plate (c-5-6), and the three groups of electrodes are respectively powered by three groups of power supply slip rings, namely the first power supply slip ring (c-12-1), the second power supply slip ring (c-12-2), and the third power supply slip ring (c-12-3); The NAPL phase separation motor (c-3) is arranged in the equipment housing (c-2), and its output shaft is connected to the rotating structure (c-5) through the NAPL phase separation belt (c-4), and the NAPL phase separation motor (c-3) provides power to the rotating structure (c-5) through the NAPL phase separation belt (c-4); The first electrode group (c-11-1), the second electrode group (c-11-2), the third electrode group (c-11-3), the first NAPL phase separation electric control valve (c-7-1), the second NAPL phase separation electric control valve (c-7-2), the third NAPL phase separation electric control valve (c-7-3), and the NAPL phase separation motor (c-3 of the NAPL phase separation device (c) are all connected to the control cabinet (f).

5. The automated multiphase extraction and separation system for contaminated sites according to claim 1, characterized in that: The vacuum pumping device (d) comprises a gas inlet (d-1) and a gas outlet, the gas inlet (d-1) is connected to the gas outlet of the gas phase separation device (b), and the gas outlet is connected to the VOC treatment device (e); The vacuum exhaust device (d) is also connected to the control cabinet (f).

6. The automated multiphase extraction and separation system for contaminated sites as claimed in claim 2, characterized in that: The control cabinet (f) obtains the extraction flow rate detected by the flow meter (a-4) and the liquid level detected by the solid phase separation liquid level meter (a-6), and controls the electric control valve and the solid phase separation motor (a-9) to automatically clean the sediment on the filter screen, specifically including: When the extraction operation begins, the states of the various electric-controlled valves and the solid-phase separation motor (a-9) are controlled as follows: the second solid-phase separation electric-controlled valve (a-5-2) is opened, the first solid-phase separation electric-controlled valve (a-5-1), the third solid-phase separation electric-controlled valve (a-5-3), and the fourth solid-phase separation electric-controlled valve (a-5-4) are closed, and the solid-phase separation motor (a-9) is stopped; at this time, the liquid in the solid-phase separation device (a) is discharged through the solid-phase separation outlet (a-11) and transported to the gas phase separation device (b), and the extraction flow rate is monitored by the flow meter (a-4); During the extraction operation, when the flow meter (a-4) detects that the extraction flow rate is lower than the set flow rate threshold, a cleaning process is performed, and the cleaning process is as follows: The first solid phase separation electric control valve (a-5-1) is opened to return the interior of the solid phase separation device (a) to normal pressure. At this time, water, air and NAPL continue to slowly enter the gas phase separation device (b). The liquid level is monitored by the solid phase separation liquid level meter (a-6). When the liquid level is lower than the set solid phase separation liquid level threshold, the second solid phase separation electric control valve (a-5-2) is closed, the third solid phase separation electric control valve (a-5-3) and the fourth solid phase separation electric control valve (a-5-4) are opened, and the external water source sprays water to the filter screen through the water spray pipe (a-7) to wash the sediment. The solid phase separation motor (a- 9 starts to run, and the mud and sand containing adsorbed organic matter are discharged through the opening of the fourth solid-phase separation electric-controlled valve (a-5-4) through the spiral blade (a-8). When the flushing time reaches the set flushing time, the third solid-phase separation electric-controlled valve (a-5-3) and the fourth solid-phase separation electric-controlled valve (a-5-4) are closed, and the solid-phase separation motor (a-9) stops running, ending the cleaning process. After the cleaning process is completed, if it is necessary to continue the extraction operation, the status of each electric-controlled valve and the solid-phase separation motor (a-9) is controlled to be the status at the beginning of the above-mentioned extraction operation, and the extraction operation is continued.

7. The automated multiphase extraction and separation system for contaminated sites as claimed in claim 3, characterized in that: The control cabinet (f) obtains the air pressure data of the air pressure sensor (b-4) and the liquid level height detected by the gas phase separation liquid level meter (b-5), controls the gas phase separation electric control valve (b-3) to adjust the air pressure in the tank body (b-2), and controls the operation of the centrifugal pump (b-7) to pump the water and NAPL in the tank body (b-2) to the NAPL phase separation device (c), specifically including: When the extraction operation starts, the centrifugal pump (b-7) stops, the NAPL phase separation device (c) stops, and the liquid level in the tank body (b-2) is monitored by the gas phase separation liquid level meter (b-5); when the liquid level is higher than the upper limit of the set gas phase separation liquid level range, the NAPL phase separation process starts, the centrifugal pump (b-7) runs, and the NAPL phase separation device (c) runs synchronously; when the gas phase separation liquid level meter (b-5) monitors that the liquid level in the tank body (b-2) is lower than the lower limit of the set gas phase separation liquid level range or the extraction operation needs to be stopped, the centrifugal pump (b-7) stops, the NAPL phase separation device (c) stops, and the NAPL phase separation process ends.

8. The automated multiphase extraction and separation system for contaminated sites as claimed in claim 4, characterized in that: The control cabinet (f) obtains the resistivity information of the electrode group, controls the electric control valve and the NAPL phase separation motor (c-3) to separate the water containing dissolved organic matter, the light non-aqueous phase liquid LNAPL and the heavy non-aqueous phase liquid DNAPL, specifically including: When the NAPL phase separation process begins, the NAPL phase separation motor (c-3) starts to run, the first NAPL phase separation electric control valve (c-7-1), the second NAPL phase separation electric control valve (c-7-2), and the third NAPL phase separation electric control valve (c-7-3) are closed, and the resistivity is monitored by the first electrode group (c-11-1), the second electrode group (c-11-2), and the third electrode group (c-11-3); When the first electrode group (c-11-1) detects that the resistivity reaches the resistivity setting threshold for separating LNAPL, the second NAPL phase separation electric control valve (c-7-2) opens to discharge the LNAPL; When the third electrode group (c-11-3) detects that the resistivity reaches the resistivity setting threshold for separating DNAPL, the third NAPL phase separation electric control valve (c-7-3) opens to discharge the DNAPL; When the second electrode group (c-11-2) detects that the resistivity reaches the set resistivity threshold of the separated water, the first NAPL phase separation electric control valve (c-7-1) opens to discharge the water containing dissolved organic matter; If the NAPL phase separation process is terminated, the NAPL phase separation motor (c-3) stops running, and the first NAPL phase separation electric control valve (c-7-1), the second NAPL phase separation electric control valve (c-7-2), and the third NAPL phase separation electric control valve (c-7-3) are closed.

9. The automated multiphase extraction and separation system for contaminated sites according to claim 5, characterized in that: The control cabinet (f) controls the operation of the vacuum pumping equipment, and specifically includes: Before the extraction operation begins, the extraction negative pressure range is set in the control cabinet, and the pressure is a negative value, including the lower limit and the upper limit of the air pressure range; the extraction negative pressure is adjusted to be lower than the set upper limit of the air pressure range through the vacuum pumping equipment (d), and the extraction negative pressure is adjusted to be greater than the set lower limit of the air pressure range through the gas phase separation electric control valve (b-3); When the extraction operation begins, the vacuum pumping equipment (d) starts to run, the gas phase separation electric control valve (b-3) is closed, and the air pressure in the tank body (b-2) is monitored by the air pressure sensor (b-4). When the air pressure in the tank body (b-2) is lower than the upper limit of the set air pressure range, the vacuum pumping equipment (d) stops running; if the air pressure in the tank body (b-2) is lower than the lower limit of the set air pressure range, the gas phase separation electric control valve (b-3) opens, and the air pressure is increased until it is greater than the lower limit of the set air pressure range, and then it is determined whether to end the extraction operation. If the extraction operation is not ended, the gas phase separation electric control valve (b-3) is closed, and the return air pressure sensor (b-4) monitors the air pressure status in the tank body (b-2). If the extraction operation is ended, the program ends.

10. The automated multiphase extraction and separation system for contaminated sites according to claim 1, characterized in that: The control cabinet (f) is provided with a touch screen, and the touch screen is provided with parameter setting, start extraction, and end extraction buttons for human-computer interaction.

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