An automated multiphase extraction separation system for contaminated sites

Abstract

The present application provides a kind of contaminated site automation multiphase extraction separation system, comprising: solid phase separation device, gas phase separation device, NAPL phase separation device, vacuum air extraction equipment, VOC processing device and control cabinet, and the separation of silt containing adsorbed organic matter, volatile organic compound-containing gas, water containing dissolved organic matter, light non-aqueous phase liquid (LNAPL) and heavy non-aqueous phase liquid (DNAPL).The present application integrates multiphase extraction and multiphase separation, and can simultaneously realize extraction and separation, thereby significantly improving the remediation efficiency of soil organic pollution and the efficiency of pollutant treatment;The system has an automatic control program, can automatically perform extraction and separation operation, can be operated stably for a long time, is simple and convenient to operate, has low technical level requirement for operator, and is conducive to the popularization and application of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of contaminated site soil remediation, and particularly relates to a contaminated site automatic multi-phase extraction separation system. BACKGROUND

[0002] Soil organic pollutants mainly include volatile organic compounds (Volatile Organic Compounds, VOC), dissolved organic matter (Dissolved Organic Matter, DOM), adsorbed organic matter and non-aqueous phase liquids (Non-Aqueous Phase Liquids, NAPL), wherein NAPL can be divided into light non-aqueous phase liquids (Light Non-Aqueous Phase Liquids, LNAPL) and dense non-aqueous phase liquids (Dense Non-Aqueous Phase Liquids, DNAPL) according to density. At present, the remediation technologies for contaminated sites mainly include multi-phase extraction, chemical oxidation, solidification and stabilization, biodegradation and the like, wherein the multi-phase extraction technology can extract underground contaminated water, gas and NAPL to the ground by a vacuum method, so as to reduce the content of organic pollutants in soil and underground water. Due to the effect of rapidly controlling and simultaneously remedying underground pollution, the multi-phase extraction technology is widely applied. At present, the multi-phase extraction equipment in China is in the initial development stage, and the existing multi-phase extraction equipment can only extract underground pollutants and then transport them to a hazardous waste treatment institution, and it is difficult to realize separation and treatment on site. Moreover, the operation process of the existing multi-phase extraction equipment is complex, and it usually requires high technical level and proficiency of the operator, and cannot realize automatic and stable operation. Therefore, it is of great significance to develop stable and efficient multi-phase extraction equipment to respond to the demand of the state for the treatment of contaminated sites, and to protect the environment and the safety of residents. SUMMARY

[0003] In view of the deficiencies of the existing multi-phase extraction equipment, the present application provides a contaminated site automatic multi-phase extraction separation system.

[0004] The technical scheme of the present application is as follows:

[0005] A contaminated site automatic multi-phase extraction separation system, comprising: a solid phase separation device a, a gas phase separation device b, a NAPL phase separation device c, a vacuum air extraction equipment d, a VOC treatment device e and a control cabinet f, wherein:

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

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

[0008] The NAPL phase separation device c is used for separating the water containing soluble organic matter, the light non-aqueous phase liquid LNAPL and the heavy non-aqueous phase liquid DNAPL;

[0009] The vacuum air extraction device 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 discharges the gas after purification by the VOC treatment device e;

[0010] The control cabinet f is connected with the solid phase separation device a, the gas phase separation device b, the NAPL phase separation device c and the vacuum air extraction device d, and is used for realizing automatic operation of the multiphase extraction and separation operation.

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

[0012] 1. The contaminated site automatic multiphase extraction and separation system integrates the multiphase extraction and the multiphase separation, and can realize the extraction and the separation simultaneously, so that the remediation efficiency of the soil organic pollution and the pollutant treatment efficiency are improved significantly.

[0013] 2. The solid phase separation device, the gas phase separation device and the NAPL phase separation device are developed for the separation of the extract, and the silt containing adsorbed organic matter, the gas containing volatile organic compounds, the water containing soluble organic matter, the LNAPL and the DNAPL are separated, so as to be further treated.

[0014] 3. The system has an automatic control program, and can automatically perform the extraction and separation operation, and is long-term stable, simple and convenient to operate, and has low requirement on the technical level of the operator, so that the system is beneficial to popularization and application. DETAILED DESCRIPTION

[0015] Figure 1 Fig. 1 is a structural schematic diagram of the system.

[0016] Figure 2 Fig. 2 is a process flow schematic diagram of the system.

[0017] Figure 3 Fig. 3 is a whole three-dimensional structural schematic diagram of the system.

[0018] Figure 4 Fig. 4 is a structural exploded schematic diagram of the system.

[0019] Figure 5 Fig. 5 is a schematic diagram of the appearance structure of the solid phase separation device.

[0020] Figure 6Figure 2 is a schematic diagram of the external structure of the solid phase separation device.

[0021] Figure 7 Figure 3 is a schematic diagram of the internal structure of the solid phase separation device.

[0022] Figure 8 Figure 4 is a schematic diagram of the structure of the gas phase separation device.

[0023] Figure 9 Figure 5 is a schematic diagram of the internal structure of the NAPL phase separation device.

[0024] Figure 10 Figure 6 is a schematic diagram of the assembly of the rotating structure in the NAPL phase separation device.

[0025] Figure 11 Figure 7 is a sectional view of the rotating structure in the NAPL phase separation device.

[0026] Figure 12 Figure 8 is a schematic diagram of the cross-sectional structure of the solid phase separation device. Figure 11

[0027] Figure 13 Figure 9 is a flow chart of the automatic control of the solid phase separation device.

[0028] Figure 14 Figure 10 is a flow chart of the automatic control of the gas phase separation device.

[0029] Figure 15 Figure 11 is a flow chart of the automatic control of the NAPL phase separation device.

[0030] Figure 16 Figure 12 is a flow chart of the automatic control of the vacuum pumping equipment.

[0031] Reference signs:

[0032] Figure 1 is a solid phase separation device a, wherein: extract inlet a-1, solid phase separation device shell 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 liquid level meter a-6, water spray pipe a-7, helical blade a-8, solid phase separation motor a-9, solid phase separation belt a-10, solid phase separation outlet a-11;

[0033] Figure 2 is a gas phase separation device b, wherein: gas phase separation inlet b-1, gas phase separation tank body b-2, gas phase separation electric control valve b-3, gas pressure sensor b-4, gas phase separation liquid level meter b-5, gas outlet b-6, centrifugal pump b-7, check valve b-8, liquid outlet b-9; ​

[0034] NAPL phase separation device c, wherein: mixed liquid inlet c-1, device shell c-2, NAPL phase separation motor c-3, NAPL phase separation belt c-4, rotating structure c-5, separation tube c-6, first NAPL phase separation electric valve c-7-1, second NAPL phase separation electric valve c-7-2, third NAPL phase separation electric 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 structure c-5 comprises: bearing c-5-1, rotating shell c-5-2, rotating blade c-5-3, first bottom plate c-5-4, first center circular hole c-5-4-1, arc-shaped opening c-5-4-2, first circular opening c-5-4-3, second bottom plate c-5-5, second center circular hole c-5-5-1, groove c-5-5-2, second circular opening c-5-5-3, third bottom plate c-5-6, third center circular hole c-5-6-1, rectangular groove c-5-6-2, centrifugal zone inlet c-5-7, first flow channel c-5-8, second flow channel c-5-9, third flow channel c-5-10, first connecting pipe c-5-11, second connecting pipe c-5-12, third connecting pipe c-5-13;

[0035] Vacuum air extraction device d, wherein: gas inlet d-1;

[0036] VOC treatment device e;

[0037] Control cabinet f. DETAILED DESCRIPTION

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

[0039] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 A contaminated site automated multi-phase extraction separation system, comprising: solid phase separation device a, gas phase separation device b, NAPL phase separation device c, vacuum air extraction device d, VOC treatment device e and control cabinet f, wherein:

[0040] The solid phase separation device a is used to separate the silt containing adsorbed organic matter in the extract, and the extract after separation of the silt 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 compounds 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 unit 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 operation, extracting the gas containing volatile organic compounds from the tank of the gas phase separation device b, and then purifying it in the VOC treatment device e before discharging;

[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 to realize the automated operation of the multiphase extraction and separation operation.

[0045] The solid phase separation device a is used to separate the sediment containing adsorbed organic matter from 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 electrically controlled valves, namely the first solid-phase separation electrically controlled valve a-5-1, the second solid-phase separation electrically controlled valve a-5-2, the third solid-phase separation electrically controlled valve a-5-3, and the fourth solid-phase separation electrically controlled valve a-5-4; the first solid-phase separation electrically controlled valve a-5-1 is set on the top of the solid-phase separation equipment shell 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. 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, in descending order of pore size, 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. They are used for multi-stage filtration of sediment containing adsorbed organic matter and are evenly arranged in sequence within the solid phase separation equipment housing a-2. The first filter screen a-3-1 is adjacent to the extract inlet a-1.

[0050] The four water spraying pipes a-7 are arranged behind each filter screen, and the four water spraying pipes a-7 are connected to an external water source through the third solid-liquid separation electric valve a-5-3 for spraying water on the filter screen to clean the filter screen.

[0051] The spiral blade a-8 is arranged at the bottom of the solid-liquid separation device shell a-2, one end of the spiral blade a-8 is provided with the fourth solid-liquid separation electric valve a-5-4 for discharging the sediment, and the other end of the spiral blade a-8 is connected with the output shaft of the solid-liquid separation motor a-9 through the solid-liquid separation belt a-10, the solid-liquid separation motor a-9 provides rotating power for the spiral blade a-8 through the solid-liquid separation belt a-10, and the spiral blade a-8 rotates to discharge the sediment containing the adsorbed organic matter through the fourth solid-liquid separation electric valve a-5-4.

[0052] The liquid level meter a-6 is arranged on the side of the solid-liquid separation device shell a-2 for monitoring the liquid level in the solid-liquid separation device.

[0053] The gas-liquid separation device b is used for separating the gas containing volatile organic compounds in the extract, and includes a gas-liquid separation inlet b-1, a tank b-2, a gas-liquid separation electric valve b-3, a gas pressure sensor b-4, a gas-liquid separation liquid 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, as shown in Figure 8

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

[0055] The gas-liquid separation electric valve b-3 is arranged on the upper side of the tank b-2 for adjusting the gas pressure in the tank;

[0056] The gas pressure sensor b-4 is arranged on the upper side of the tank b-2 for monitoring the gas pressure in the tank;

[0057] The gas-liquid separation liquid level meter b-5 is arranged on the side of the tank b-2 for monitoring the liquid level in the tank;

[0058] The bottom of the tank b-2 is communicated with the inlet of the centrifugal pump b-7 through a pipeline, the outlet of the centrifugal pump b-7 is connected with the liquid outlet b-9, the check valve b-8 is arranged 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 communicated with 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 liquid 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 for separating water containing dissolved organic matter, light non-aqueous phase liquid (LNAPL) and heavy non-aqueous phase liquid (DNAPL), comprising: a mixed liquid inlet c-1, a device shell c-2, a NAPL phase separation motor c-3, a NAPL phase separation belt c-4, a rotating structure c-5, a separation tube c-6, a first NAPL phase separation electric valve c-7-1, a second NAPL phase separation electric valve c-7-2, a third NAPL phase separation electric valve c-7-3, a water outlet c-8, a 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, as shown in Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 wherein:

[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 in communication with the liquid outlet b-9 of the gas phase separation device b;

[0061] The rotating structure c-5 is installed in the device shell c-2, the upper part of the rotating structure c-5 is in communication with the mixed liquid inlet c-1, and the lower part is connected with the separation tube c-6; the rotating structure c-5 is used for high-speed rotation to realize the mutual separation of water containing dissolved organic matter, light non-aqueous phase liquid (LNAPL) and heavy non-aqueous phase liquid (DNAPL), comprising 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 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 clamped into the groove of the first bottom plate c-5-4, the upper part of the rotating blade c-5-3 is clamped 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 inlet and three independent flow channels are formed inside the rotating structure, and the upper and lower parts of the whole are respectively provided with two bearings c-5-1, thus forming the rotating structure c-5.

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

[0063] The rotating shell c-5-2 is in the shape of a circular truncated cone, which is narrow at the top and wide at the bottom;

[0064] A centrifugal zone inlet c-5-7 is arranged between the rotating vane c-5-3 top edge and the rotating shell c-5-2;

[0065] The rotating vane 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 the rotating vane c-5-3; a third flow channel c-5-10 is arranged between the rotating vane c-5-3 and the rotating shell c-5-2 side wall; the three flow channels are communicated in the horizontal direction through the grid of the rotating vane c-5-3;

[0066] The first bottom plate c-5-4 is centrally provided with a first circular hole c-5-4-1, which is communicated with the first flow channel c-5-8 inside the rotating vane c-5-3; an arc-shaped opening c-5-4-2 is arranged in the middle, which is communicated with the second flow channel c-5-9 inside the rotating vane c-5-3; and a first circular opening c-5-4-3 is arranged at the edge, which is communicated with the third flow channel c-5-10 inside the rotating vane c-5-3;

[0067] The second bottom plate c-5-5 is centrally provided with a second circular hole c-5-5-1, and a circle of grooves c-5-5-2 is arranged along the second circular hole c-5-5-1; the groove c-5-5-2 is opposite to and communicated with the arc-shaped opening c-5-4-2 of the first bottom plate c-5-4, and is further communicated with the second flow channel c-5-9 inside the rotating vane c-5-3; a second circular opening c-5-5-3 is arranged at the edge, which is communicated with the first circular opening c-5-4-3 at the edge of the first bottom plate c-5-4, and is further communicated with the third flow channel c-5-10 inside the rotating vane c-5-3;

[0068] The third bottom plate c-5-6 is centrally provided with a third circular hole c-5-6-1, and a rectangular groove c-5-6-2 is arranged at the edge of the third circular hole c-5-6-1 in the radial direction; 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 is further communicated with the third flow channel c-5-10 inside the rotating vane c-5-3;

[0069] The hole diameters of the first connecting pipe c-5-11, the second connecting pipe c-5-12 and the third connecting pipe c-5-13 are arranged from small to large; the first connecting pipe c-5-11 is connected at the bottom of the first bottom plate c-5-4 and is communicated with the first central circular hole c-5-4-1; the second connecting pipe c-5-12 is connected at the bottom of the second bottom plate c-5-5 and is communicated with the second central circular hole c-5-5-1; and the third connecting pipe c-5-13 is connected at the bottom of the third bottom plate c-5-6 and is communicated with the third central circular hole c-5-6-1;

[0070] The three connecting pipes are nested in sequence and have gaps between adjacent inner and outer walls; sealing measures are arranged at the connecting positions of the three connecting pipes and the bottom plate.

[0071] The first connecting pipe c-5-11 is in communication 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 in the interior of the rotating vane c-5-3 in sequence, forming a complete flow channel, i.e. LNAPL flow channel, for discharging 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 in communication with the second circular hole c-5-5-1 in 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 in the interior of the rotating vane c-5-3 in sequence, forming a complete flow channel, i.e. 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 in communication 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 in the interior of the rotating vane c-5-3 in sequence, forming a complete flow channel, i.e. DNAPL flow channel, for discharging DNAPL.

[0074] The separation pipe c-6 contains three passage outlets, which are in communication with the three complete flow channels (LNAPL flow channel, water flow channel and DNAPL flow channel) of the rotating structure c-5, so that the separation pipe c-6 outputs in three ways: 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 arranged on the first bottom plate c-5-4, the second bottom plate c-5-5 and the third bottom plate c-5-6 respectively, for measuring the liquid resistivity to monitor the separation purity (LNAPL and DNAPL have high resistivity, and water containing dissolved organic matter has low resistivity), and the three groups of electrodes are powered by three groups of power supply slip rings, i.e. 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 example, 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 shell c-2, and the output shaft thereof is connected with the rotating structure c-5 through the NAPL phase separation belt c-4, and the NAPL phase separation motor c-3 provides power for the rotating structure c-5 through the NAPL phase separation belt c-4.

[0077] The shunt principle of water and NAPL phase separation is as follows:

[0078] After the 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 lower part of the rotating vane c-5-3 through the centrifugal zone inlet c-5-7 at the top edge of the rotating vane c-5-3, the NAPL phase separation motor c-3 provides power to make the rotating structure c-5 rotate at high speed, and the mixed liquid in the centrifugal zone is driven to rotate at high speed by the rotating vane c-5-3, since the LNAPL has smaller density than water, the LNAPL in the mixed liquid will transfer to the rotating shaft center c-13, i.e. the LNAPL transfers to the first flow channel c-5-8 through the grid of the rotating vane c-5-3, and similarly, since the DNAPL has larger density than water, the DNAPL in the mixed liquid will move away from the rotating shaft center c-13, i.e. the LNAPL transfers to the third flow channel c-5-10 through the grid of the rotating vane c-5-3, and the water is located between the LNAPL and the DNAPL, thereby the LNAPL, the water and the DNAPL are separated, and from the rotating shaft center c-13 outward, they are LNAPL, water and DNAPL in turn, and the inclined side wall of the rotating shell c-5-2 helps the DNAPL to gather at the outer edge at the bottom of the centrifugal zone, and the center of the rotating vane c-5-3 has a conical structure with the top of the cone downward, which helps the LNAPL to gather at the rotating shaft center at the bottom of the centrifugal zone;

[0079] LNAPL and DNAPL have higher resistivity than water, the LNAPL resistivity is monitored by the first electrode group c-11-1, when the LNAPL resistivity reaches the LNAPL resistivity set threshold, the second NAPL phase separation electric control valve c-7-2 opens, the LNAPL passes through the LNAPL flow channel and is discharged through the LNAPL outlet c-9; similarly, the DNAPL resistivity is monitored by the third electrode group c-11-3, when the DNAPL resistivity reaches the DNAPL resistivity set threshold, the third NAPL phase separation electric control valve c-7-3 opens, the DNAPL passes through the DNAPL flow channel and is discharged through the DNAPL outlet c-10; the water resistivity is monitored by the second electrode group c-11-2, when the water resistivity reaches the water resistivity set threshold, the first NAPL phase separation electric control valve c-7-1 opens, the water containing dissolved organic matter passes through the water flow channel and is discharged through the water outlet c-8.

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

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

[0082] The control cabinet f is connected with the flow meter a-4, the solid phase separation liquid level meter a-6, the electric control valve (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) 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 height detected by the solid phase separation liquid level meter a-6, controls the electric control valve and the solid phase separation motor a-9 to automatically clean the silt on the filter screen, and the specific automatic control process is as shown in Figure 13

[0083] ​At the beginning of the extraction operation, the states of each electric control valve and the solid-phase separation motor a-9 are controlled as follows: the second solid-phase separation electric control valve a-5-2 is opened, the first solid-phase separation electric control valve a-5-1, the third solid-phase separation electric control valve a-5-3, and the fourth solid-phase separation electric control 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 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] The first solid-phase separation electric control valve a-5-1 is opened to return the inside of the solid-phase separation device a to the normal pressure state, at this time, water, air and NAPL continue to slowly enter the gas-phase separation device b, and 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, the external water source sprays water to the filter screen through the water spraying pipe a-7, washes the silt, the solid-phase separation motor a-9 starts to run, and the silt containing adsorbed organic matter is discharged through the opening of the fourth solid-phase separation electric control valve a-5-4 by the spiral blade a-8, when the washing time reaches the set washing time length, the third solid-phase separation electric control valve a-5-3 and the fourth solid-phase separation electric control valve a-5-4 are closed, the solid-phase separation motor a-9 stops running, and the cleaning process is ended; after the cleaning process is ended, if the extraction operation needs to continue, the states of each electric control valve and the solid-phase separation motor a-9 are controlled as the states at the beginning of the extraction operation, and the extraction operation is continued.

[0086] The control cabinet f is connected with the gas-phase separation liquid level meter b-5, the gas 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 gas pressure data of the gas 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 gas pressure in the tank body b-2, and controls the centrifugal pump b-7 to run to pump the water and NAPL in the tank body b-2 to the NAPL phase separation device c, and the specific automatic control process is as shown in Figure 14 .

[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 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 operates, and the NAPL phase separation device c operates synchronously; when the gas phase separation liquid level meter b-5 detects that the liquid level in the tank 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.

[0088] The control cabinet f is connected with the electrode groups (the first electrode group c-11-1, the second electrode group c-11-2, and the third electrode group c-11-3), the electric control valves (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), and the NAPL phase separation motor c-3 of the NAPL phase separation device c, obtains the resistivity information of the electrode groups, controls the electric control valves and the NAPL phase separation motor c-3 to realize the mutual separation of water containing dissolved organic matter, light non-aqueous phase liquid (LNAPL), and heavy non-aqueous phase liquid (DNAPL), and the specific automatic control process is as shown in Figure 15

[0089] When the NAPL phase separation process starts, the NAPL phase separation motor c-3 starts to operate, 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 set threshold value for separating LNAPL, the second NAPL phase separation electric control valve c-7-2 is opened to discharge the LNAPL.

[0091] When the third electrode group c-11-3 detects that the resistivity reaches the resistivity set threshold value for separating DNAPL, the third NAPL phase separation electric control valve c-7-3 is opened to discharge the DNAPL.

[0092] When the second electrode group c-11-2 detects that the resistivity reaches the resistivity set threshold value for separating water, the first NAPL phase separation electric control valve c-7-1 is opened 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 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.

[0094] The control cabinet f is connected with the vacuum air extraction device d, and controls the operation of the vacuum air extraction device. The specific automatic control process is as shown in the figure. Figure 16

[0095] Before the extraction operation starts, the extraction negative pressure range is set in the control cabinet, the pressure is negative, and includes the lower limit of the gas pressure range and the upper limit of the gas pressure range. The extraction negative pressure is adjusted to be lower than the set upper limit of the gas pressure range by the vacuum air extraction device d, and the extraction negative pressure is adjusted to be greater than the set lower limit of the gas pressure range by the gas phase separation electric control valve b-3.

[0096] When the extraction operation starts, the vacuum air extraction device d starts to operate, the gas phase separation electric control valve b-3 is closed, the gas pressure in the tank b-2 is monitored by the gas pressure sensor b-4, and when the gas pressure in the tank b-2 is lower than the set upper limit of the gas pressure range, the vacuum air extraction device d stops operating. If the gas pressure in the tank b-2 is lower than the set lower limit of the gas pressure range, the gas phase separation electric control valve b-3 is opened, the gas pressure is increased until it is greater than the set lower limit of the gas pressure range, and then it is determined whether the extraction operation is ended. If the extraction operation is not ended, the gas phase separation electric control valve b-3 is closed, and the gas pressure in the tank b-2 is monitored by the gas pressure sensor b-4. If the extraction operation is ended, the program is ended.

[0097] Further, a touch screen is arranged on the control cabinet, and buttons such as parameter setting, start extraction and end extraction are arranged on the touch screen for man-machine interaction.

[0098] The use method of the above-mentioned automatic multi-phase extraction separation system for contaminated sites comprises the following steps:

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

[0100] Step 2: Start extraction. Click the start extraction button on the touch screen of the control cabinet, and the multi-phase extraction separation operation can be automatically performed. After the extraction operation is completed, the extraction is ended.

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

[0102] When applied, the extraction inlet a-1 of the solid phase separation device a is connected with the extraction well, and a plurality of extraction wells can be connected at the same time. The third solid phase separation electric control valve a-5-3 is connected with an external water source.

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

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

[0105] After the parameters are set in the control cabinet f, the extraction button on the touch screen is clicked to start the extraction operation. Specifically, step 2 includes:

[0106] 2.1: The vacuum pumping device d operates 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 extraction of the water, air, sand and NAPL containing pollutants in the extraction well is sucked into the extraction inlet a-1 of the solid-phase separation device a.

[0107] 2.2: After the extraction passes through the multi-stage filtration of the filter screens (in order of 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 the solid-phase separation device a in the order of decreasing pore size, the sand containing adsorbed organic matter is retained on the filter screens, and the water, air and NAPL enter the gas-phase separation device b.

[0108] After the device operates for a certain period of time, the filter screens are blocked by the sand, and the water, air and NAPL are difficult to pass through, so 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, the sand on the filter screens is automatically cleaned.

[0109] 2.3: After the water, air and NAPL containing pollutants pass through the gas-phase separation inlet b-1 and enter the gas-phase separation device b, the water and NAPL are located in the lower part of the tank b-2, and the air in the upper part is extracted by the vacuum pumping device d through the gas outlet b-6 and discharged into the VOC treatment device e, and is discharged after being purified;

[0110] When the gas phase separation liquid level meter b-5 monitors that the liquid level in the tank b-2 reaches the upper limit of the set gas phase separation liquid level range, the centrifugal pump b-7 and the NAPL phase separation device c start to operate to separate the LNAPL, DNAPL and water.

[0111] Specifically, the step 3, after the extraction operation is completed, the end extraction button of the control cabinet f touch screen is clicked, the system stops running and automatically opens the gas phase separation electric control valve b-3, so that the internal tank b-2 returns to the normal pressure state.

[0112] The above description is only a description of the preferred embodiments of the present application, and is not any limitation on the scope of the present application. Any modification or modification made by any person skilled in the art according to the above disclosed technical content should be regarded as equivalent effective embodiments, and belongs to the protection scope of the technical scheme 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 extraction 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 from the extract, and the extract after the sediment is separated is transported to the gas phase separation device (b); the solid phase separation device (a) comprises: an extract inlet (a-1), a solid phase separation device housing (a-2), a filter, a water spray pipe (a-7), a spiral blade (a-8), a flow meter (a-4), an electric control valve, a solid phase separation level meter (a-6), 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 multiple filter screens, which are uniformly arranged in sequence in the solid phase separation device housing (a-2) for multi-stage filtration of sediment containing adsorbed organic matter; there are multiple water spray pipes (a-7), which are arranged behind each filter screen respectively for spraying water on the filter screen to clean the filter screen; the spiral blade (a-8) is arranged at the bottom of the solid phase separation device housing (a-2) for removing sediment; The gas phase separation device (b) is used to separate the gas containing volatile organic compounds from the extract, and the water and non-aqueous 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 NAPL phase separation device (c) 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), wherein: The mixed liquid inlet (c-1) is provided at the upper end of the rotating structure (c-5), and the mixed liquid inlet (c-1) is communicated with the liquid outlet of the gas phase separation device (b); The rotating structure (c-5) is installed in the equipment casing (c-2), the upper part of the rotating structure (c-5) is connected to the mixed liquid inlet (c-1), and the lower part is connected to the separation tube (c-6); 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 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) is a frustum-shaped structure, which is narrow at the top and wide at the bottom; 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). In the groove, bolts are used to fix the rotating shell (c-5-2), the rotating blades (c-5-3), the first base plate (c-5-4), the second base plate (c-5-5) and the third base plate (c-5-6) into a whole. Circular holes are provided in the centers of the first base plate (c-5-4), the second base plate (c-5-5) and the third base plate (c-5-6). The apertures of the first connecting pipe (c-5-11), the second connecting pipe (c-5-12) and the third connecting pipe (c-5-13) are nested in sequence from small to large and are respectively connected to the bottom of the first base plate (c-5-4), the second base plate (c-5-5) and the third base plate (c-5-6). The above three connecting pipes are respectively connected to the central circular holes of the above three base plates, 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; The separation pipe (c-6) outputs water, LNAPL, and DNAPL in three ways. 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) of the rotating structure (c-5); The vacuum extraction equipment (d) provides negative pressure for the multiphase extraction process, extracting the gas containing volatile organic compounds from the tank of the gas phase separation device (b). 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 multiphase 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), wherein: There are four electric-controlled valves, namely the first solid-phase separation electric-controlled valve (a-5-1), the second solid-phase separation electric-controlled valve (a-5-2), the third solid-phase separation electric-controlled valve (a-5-3), and the fourth solid-phase separation electric-controlled valve (a-5-4); the first solid-phase separation electric-controlled 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, in descending order of pore size, 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). They are evenly arranged in sequence within the solid phase separation device housing (a-2), with the first filter screen (a-3-1) being adjacent to the extract inlet (a-1); There are four water spray pipes (a-7), and 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); A fourth solid-phase separation electrically controlled valve (a-5-4) is provided at one end of the spiral blade (a-8) for discharging sediment. The other end of the spiral blade (a-8) is connected to the output shaft of the solid-phase separation motor (a-9) via a solid-phase separation belt (a-10). The solid-phase separation motor (a-9) provides rotational power to the spiral blade (a-8) via the solid-phase separation belt (a-10). The spiral blade (a-8) rotates to discharge the washed sediment containing adsorbed organic matter through the fourth solid-phase separation electrically controlled 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), an air 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 provided 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 level gauge (b-5) is arranged on the side of the tank (b-2) and is used to monitor the liquid level in the tank; 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 gauge (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), wherein: 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 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 the output shaft thereof 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); 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, wherein 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 pumping equipment (d) is also connected to the control cabinet (f).

6. The automated multiphase extraction and separation system for contaminated sites according to 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 level meter (a-6), and controls the electronically controlled 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 electrically controlled valves and the solid-phase separation motor (a-9) are controlled as follows: the second solid-phase separation electrically controlled valve (a-5-2) is opened, the first solid-phase separation electrically controlled valve (a-5-1), the third solid-phase separation electrically controlled valve (a-5-3), and the fourth solid-phase separation electrically 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 process, 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. The cleaning process is as follows: Open the first solid phase separation electric control valve (a-5-1) 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 level meter (a-6). When the liquid level is lower than the set solid phase separation 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 source to the filter through the water pipe (a-7) to wash away 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 according to claim 3, characterized in that: The control cabinet (f) obtains the air pressure data from the air pressure sensor (b-4) and the liquid level 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 (b-2), and controls the operation of the centrifugal pump (b-7) to pump the water and NAPL in the tank (b-2) to the NAPL phase separation device (c), specifically including: When the extraction operation begins, 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 liquid level gauge (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 begins, the centrifugal pump (b-7) runs, and the NAPL phase separation device (c) runs synchronously; when the gas phase separation liquid level gauge (b-5) monitors that the liquid level in the tank (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 according to claim 4, characterized in that: The control cabinet (f) obtains resistivity information of the electrode group and controls the electronically controlled valve and the NAPL phase separation motor (c-3) to separate water containing dissolved organic matter, light non-aqueous phase liquid LNAPL, and heavy non-aqueous phase liquid DNAPL, specifically including: When the NAPL phase separation process begins, the NAPL phase separation motor (c-3) starts running, 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 resistivity monitored by the first electrode group (c-11-1) reaches the resistivity set threshold for separating LNAPL, the second NAPL phase separation electric control valve (c-7-2) opens to discharge the LNAPL; When the resistivity monitored by the third electrode group (c-11-3) reaches the resistivity set threshold for separating DNAPL, the third NAPL phase separation electric control valve (c-7-3) opens to discharge the DNAPL; When the resistivity detected by the second electrode group (c-11-2) 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 ended, 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. The pressure is a negative value, including the lower limit and upper limit of the air pressure range. The extraction negative pressure is adjusted to be lower than the upper limit of the set air pressure range through the vacuum pumping equipment (d), and the extraction negative pressure is adjusted to be greater than the lower limit of the set 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, increases the air pressure until it is greater than the lower limit of the set air pressure range, and then determines 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, extraction start, and extraction end buttons for human-computer interaction.

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