A NAPL phase separation apparatus

Abstract

The present application relates to the technical field of contaminated site soil remediation, and proposes a NAPL phase separation device, which comprises a mixed liquid inlet, a device shell, a NAPL phase separation motor, a NAPL phase separation belt, a rotating structure, a separation pipe, a first NAPL phase separation electric control valve, a second NAPL phase separation electric control valve, a third NAPL phase separation electric control valve, a water outlet, a LNAPL outlet and a DNAPL outlet. The device separates the mixed liquid containing water and non-aqueous phase liquid NAPL with dissolved organic matter into water, light non-aqueous phase liquid LNAPL and heavy non-aqueous phase liquid DNAPL through a unique rotating structure, and outputs them respectively for subsequent pollutant treatment. The device can be further applied to a contaminated site multi-phase extraction separation system, and has important significance for environmental protection and resident safety.

Description

[0001] This case is a divisional application of Chinese patent application "An Automated Multiphase Extraction and Separation System for Contaminated Sites", application number 202510487088.2, application date April 17, 2025. Technical Field

[0002] This invention relates to the field of soil remediation technology for contaminated sites, specifically to an automated multiphase extraction and separation system for contaminated sites. Background Technology

[0003] Soil organic pollutants are mainly classified into volatile organic compounds (VOCs), dissolved organic matter (DOM), adsorbed organic matter, and non-aqueous phase liquids (NAPLs). NAPLs can be further classified by density into light non-aqueous phase liquids (LNAPLs) and dense non-aqueous phase liquids (DNAPLs). Currently, remediation technologies for contaminated sites mainly include multiphase extraction, chemical oxidation, solidification and stabilization, and biodegradation. Among these, multiphase extraction technology uses vacuum methods to extract contaminated groundwater, gases, and NAPLs to the surface, thereby reducing the organic pollutant content in soil and groundwater. Due to its ability to rapidly control and simultaneously remediate underground contamination, multiphase extraction technology is widely used. Currently, multiphase extraction equipment is still in its early stages of development. Existing multiphase extraction equipment typically only allows the extraction of underground pollutants and their transport to hazardous waste treatment facilities, making on-site separation and treatment difficult. Moreover, existing multiphase extraction equipment has a complex operation process, which usually requires a high level of technical skill and proficiency from the operators, and cannot achieve automatic and stable operation. Summary of the Invention

[0004] To address the shortcomings of existing multiphase extraction equipment, this invention provides an automated multiphase extraction and separation system for contaminated sites.

[0005] The technical solution of this invention:

[0006] 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 pumping device d, a VOC treatment device e, and a control cabinet f, wherein:

[0007] Solid phase separation device a is used to separate mud and sand containing adsorbed organic matter from the extract. The extract after mud and sand separation is transported to gas phase separation device b.

[0008] Gas phase separation device b is used to separate the gas containing volatile organic compounds in the extract, while water and non-aqueous liquid NAPL containing dissolved organic matter are pumped into NAPL phase separation device c.

[0009] The NAPL phase separation device c is used to separate water containing dissolved organic matter, light non-aqueous liquid LNAPL, and heavy non-aqueous liquid DNAPL.

[0010] Vacuum pumping equipment d provides negative pressure for multiphase extraction construction, extracts the gas containing volatile organic compounds from the tank of gas phase separation device b, and discharges it after purification by VOC treatment device e.

[0011] 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 multiphase extraction and separation.

[0012] A NAPL phase separation device for separating water containing dissolved organic matter, light non-aqueous liquid LNAPL, and heavy non-aqueous liquid DNAPL;

[0013] The NAPL phase separation device includes: a mixed liquid inlet c-1, a 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 electrically controlled valve c-7-1, a second NAPL phase separation electrically controlled valve c-7-2, a third NAPL phase separation electrically controlled valve c-7-3, a water outlet c-8, an LNAPL outlet c-9, and a DNAPL outlet c-10, wherein:

[0014] The mixed liquid inlet c-1 is located at the upper end of the rotating structure c-5;

[0015] The rotating structure c-5 is installed inside the equipment housing 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 pipe c-6.

[0016] The rotating structure c-5 is used for high-speed rotation to separate water, light non-aqueous liquid LNAPL, and heavy non-aqueous liquid DNAPL. It includes a bearing c-5-1, a rotating housing c-5-2, rotating blades c-5-3, a first base plate c-5-4, a second base plate c-5-5, a third base 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 has a frustum-shaped structure, narrower at the top and wider at the bottom. The rotating housing c-5-2 and the first base plate c-5-4... The rotating blade c-5-3 is fitted into the groove of the first base plate c-5-4, and the upper part of the rotating blade c-5-3 is fitted into the groove of the rotating housing c-5-2. The rotating housing c-5-2, the rotating blade 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 are fixed into a whole by bolts. A centrifugal zone inlet and three independent flow channels are formed inside the rotating structure. Two bearings c-5-1 are installed at the top and bottom of the whole respectively, thus forming the rotating structure.

[0017] The separator c-6 contains three channel outlets, which are connected to the three flow channels of the rotating structure c-5 respectively, thus the separator c-6 outputs in three ways.

[0018] Due to the adoption of the above solution, the beneficial effects of the present invention are:

[0019] 1. The present invention provides an automated multiphase extraction and separation system for contaminated sites that integrates multiphase extraction and multiphase separation, enabling simultaneous extraction and separation, thereby significantly improving the remediation efficiency and pollutant treatment efficiency of soil organic pollution.

[0020] 2. For the separation of extracts, a solid-phase separation device, a gas-phase separation device, and a NAPL phase separation device were developed to separate silt containing adsorbed organic matter, gas containing volatile organic matter, water containing dissolved organic matter, LNAPL, and DNAPL for further processing.

[0021] 3. The system has an automated control program, which can automatically perform extraction and separation operations, operate stably for a long time, and is simple and convenient to operate. It has low requirements for the technical level of operators, which is conducive to the promotion and application of the system. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the system structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the process flow of the system of the present invention.

[0024] Figure 3 This is a schematic diagram of the overall three-dimensional structure of the system of the present invention.

[0025] Figure 4 This is a schematic diagram showing the system structure decomposition of the present invention.

[0026] Figure 5 This is one of the schematic diagrams of the external structure of a solid-phase separation device.

[0027] Figure 6 This is the second schematic diagram of the external structure of a solid-phase separation device.

[0028] Figure 7 This is a schematic diagram of the internal structure of a solid-phase separation device.

[0029] Figure 8 This is a schematic diagram of a gas phase separation device.

[0030] Figure 9 This is a schematic diagram of the internal structure of the NAPL phase separation device.

[0031] Figure 10 This is a schematic diagram of the rotating structure assembly in the NAPL phase separation device.

[0032] Figure 11 This is a cross-sectional view of the rotating structure in the NAPL phase separation device.

[0033] Figure 12 for Figure 11 Schematic diagram of the cross-sectional structure along the directions A-A', B-B', C-C', D-D', E-E', and F-F'.

[0034] Figure 13 This is a flowchart of the automatic control process for a solid-phase separation device.

[0035] Figure 14 This is a flowchart of the automatic control process for a gas phase separation device.

[0036] Figure 15 This is a flowchart of the automatic control process for the NAPL phase separation device.

[0037] Figure 16 This is a flowchart of the automatic control process for a vacuum pumping device.

[0038] Figure label:

[0039] Solid phase separation device a, wherein: extractant inlet a-1, solid phase separation equipment 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 electrically controlled valve a-5-1, second solid phase separation electrically controlled valve a-5-2, third solid phase separation electrically controlled valve a-5-3, fourth solid phase separation electrically controlled valve a-5-4, solid phase separation level gauge a-6, spray pipe a-7, spiral blade a-8, solid phase separation motor a-9, solid phase separation belt a-10, and solid phase separation outlet a-11;

[0040] Gas phase separation device b, wherein: gas phase separation inlet b-1, gas phase separation tank b-2, gas phase separation electrically controlled valve b-3, gas pressure sensor b-4, gas phase separation liquid level gauge b-5, gas outlet b-6, centrifugal pump b-7, check valve b-8, liquid outlet b-9;

[0041] NAPL phase separation device c, comprising: mixed liquid inlet c-1, equipment casing 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 electrically controlled valve c-7-1, second NAPL phase separation electrically controlled valve c-7-2, third NAPL phase separation electrically controlled 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 shaft center is located at the center of the rotating shaft. The rotating structure c-5 includes: bearing c-5-1, rotating housing c-5-2, rotating blade c-5-3, first base plate c-5-4, first central circular hole c-5-4-1, arc-shaped opening c-5-4-2, first circular opening c-5-4-3, second base plate c-5-5, second central circular hole c-5-5-1, groove c-5-5-2, second circular opening c-5-5-3, third base plate c-5-6, third central circular hole c-5-6-1, rectangular groove c-5-6-2, centrifuge 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, and third connecting pipe c-5-13;

[0042] Vacuum pumping equipment d, where: gas inlet d-1;

[0043] VOC treatment device e;

[0044] Control cabinet f. Detailed Implementation

[0045] The technical solutions provided in this application will be further described below with reference to specific embodiments and accompanying drawings. The advantages and features of this application will become clearer from the following description.

[0046] 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 pumping device d, a VOC treatment device e, and a control cabinet f, wherein:

[0047] Solid phase separation device a is used to separate mud and sand containing adsorbed organic matter from the extract. The extract after mud and sand separation is transported to gas phase separation device b.

[0048] Gas phase separation device b is used to separate the gas containing volatile organic compounds in the extract, while water and non-aqueous liquid (NAPL) containing dissolved organic matter are pumped into NAPL phase separation device c.

[0049] The NAPL phase separation device c is used to separate water containing dissolved organic matter, light non-aqueous liquid (LNAPL), and heavy non-aqueous liquid (DNAPL).

[0050] Vacuum pumping equipment d provides negative pressure for multiphase extraction construction, extracts the gas containing volatile organic compounds from the tank of gas phase separation device b, and discharges it after purification by VOC treatment device e.

[0051] 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 multiphase extraction and separation.

[0052] The solid-phase separation device a is used to separate silt containing adsorbed organic matter from the extract, and includes: extract inlet a-1, solid-phase separation equipment shell a-2, filter screen, flow meter a-4, electrically controlled valve, solid-phase separation level gauge a-6, spray pipe a-7, spiral blade a-8, solid-phase separation motor a-9, solid-phase separation belt a-10, and solid-phase separation outlet a-11, as shown. Figure 5 , Figure 6 , Figure 7 As shown, where:

[0053] There are four electrically controlled valves: 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 located on the top of the outer shell a-2 of the solid phase separation equipment and is used to regulate the internal air pressure of the solid phase separation device.

[0054] The extract inlet a-1 is located on one side of the outer shell a-2 of the solid phase separation equipment and is connected to the extraction well (not shown in the figure);

[0055] The solid phase separation outlet a-11 is located on the other side of the solid phase separation equipment shell a-2. A flow meter a-4 and a second solid phase separation electrically controlled 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.

[0056] There are four filters, arranged in descending order of pore size as filter a-3-1, filter a-3-2, filter a-3-3, and filter a-3-4, which are used for multi-stage filtration of silt containing adsorbed organic matter. They are arranged evenly in sequence inside the outer shell a-2 of the solid phase separation equipment, with filter a-3-1 being close to the extract inlet a-1.

[0057] 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 electrically controlled valve a-5-3, which is used to spray water onto the filter screen to clean it.

[0058] The spiral blade a-8 is located at the bottom of the outer shell a-2 of the solid phase separation equipment. One end of the spiral blade a-8 is equipped with a fourth solid phase separation electrically controlled valve a-5-4 for discharging silt and sand. 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. The solid phase separation motor a-9 provides rotational power to the spiral blade a-8 through the solid phase separation belt a-10. The rotation of the spiral blade a-8 discharges the silt and sand containing adsorbed organic matter that has been washed down through the fourth solid phase separation electrically controlled valve a-5-4.

[0059] The level gauge a-6 is used to monitor the liquid level inside the solid phase separation device and is arranged on the side of the solid phase separation device housing a-2.

[0060] The gas phase separation device b is used to separate gases containing volatile organic compounds from the extract, and includes: a gas phase separation inlet b-1, a tank b-2, a gas phase separation electrically controlled valve b-3, a gas 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, as shown. Figure 8 As shown, where:

[0061] The gas phase separation inlet b-1 and the gas outlet b-6 are located at the upper end of the tank b-2. The gas phase separation inlet b-1 is connected to the solid phase separation outlet a-11 of the solid phase separation device a, the gas outlet b-6 is connected to the gas inlet of the vacuum pumping device d, and the liquid outlet b-9 is connected to the mixed liquid inlet c-1 of the c-NAPL phase separation device.

[0062] The gas phase separation electrically controlled valve b-3 is located on the upper side of tank b-2 and is used to regulate the gas pressure inside the tank.

[0063] Pressure sensor b-4 is located on the upper side of tank b-2 and is used to monitor the pressure inside the tank.

[0064] The gas phase separation level gauge b-5 is arranged on the side of the tank b-2 to monitor the liquid level inside the tank;

[0065] The bottom of tank b-2 is connected to the inlet of centrifugal pump b-7 via a pipe. The outlet of centrifugal pump b-7 is connected to liquid outlet b-9. A check valve b-8 is installed between the outlet of centrifugal pump b-7 and liquid outlet b-9. After passing through check valve b-8, the liquid is discharged through liquid outlet b-9. Liquid outlet b-9 is connected to the mixed liquid inlet c-1 of NAPL phase separation device c. Centrifugal pump b-7 is used to provide power during the liquid discharge process, and check valve b-8 is used to prevent liquid backflow.

[0066] The NAPL phase separation device c is used to separate water containing dissolved organic matter, light non-aqueous liquid (LNAPL), and heavy non-aqueous liquid (DNAPL). It includes: a mixed liquid inlet c-1, a device housing c-2, an NAPL phase separation motor c-3, an NAPL phase separation belt c-4, a rotating structure c-5, a separation tube c-6, a first NAPL phase separation electrically controlled valve c-7-1, a second NAPL phase separation electrically controlled valve c-7-2, a third NAPL phase separation electrically controlled 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. Figure 9 , Figure 10 , Figure 11 , Figure 12 As shown, where:

[0067] The mixed liquid inlet c-1 is located 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;

[0068] Rotating structure c-5 is installed inside the equipment housing c-2. The upper part of rotating structure c-5 is connected to the mixed liquid inlet c-1, and the lower part is connected to the separation pipe c-6. 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). It includes bearing c-5-1, rotating housing c-5-2, rotating blades c-5-3, first base plate c-5-4, second base plate c-5-5, third base plate c-5-6, first connecting pipe c-5-11, second connecting pipe c-5-12, and third connecting pipe c-5-12. 13; The rotating outer shell c-5-2 and the first base 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 base plate c-5-4, and the upper part of the rotating blade c-5-3 is inserted into the groove of the rotating outer shell c-5-2. The rotating outer shell c-5-2, the rotating blade 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 are fixed into a whole by bolts. A centrifugal zone inlet and three independent flow channels are formed inside the rotating structure. Two bearings c-5-1 are installed on the upper and lower parts of the whole, thus forming the rotating structure c-5.

[0069] Furthermore, the rotating structure c-5:

[0070] The rotating outer shell c-5-2 has a frustum-shaped structure, narrower at the top and wider at the bottom;

[0071] A centrifugal zone inlet c-5-7 is provided between the top edge of the rotating blade c-5-3 and the rotating outer shell c-5-2;

[0072] The rotating blade c-5-3 has a grid structure, with a first flow channel c-5-8 and a second flow channel c-5-9 inside. A third flow channel c-5-10 is provided 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.

[0073] First base plate c-5-4: has a first circular hole c-5-4-1 at the center, which communicates with the first flow channel c-5-8 inside the rotating blade c-5-3; has an arc-shaped opening c-5-4-2 in the middle, which communicates with the second flow channel c-5-9 inside the rotating blade c-5-3; and has a first circular opening c-5-4-3 at the edge, which communicates with the third flow channel c-5-10 inside the rotating blade c-5-3.

[0074] The second base plate c-5-5 has a second circular hole c-5-5-1 at its center, and a groove c-5-5-2 around the second circular hole c-5-5-1. The groove c-5-5-2 is opposite to and communicates with the arc-shaped opening c-5-4-2 of the first base plate c-5-4, and then communicates with the second flow channel c-5-9 inside the rotating blade c-5-3. The edge has a second circular opening c-5-5-3, which communicates with the first circular opening c-5-4-3 at the edge of the first base plate c-5-4, and then communicates with the third flow channel c-5-10 inside the rotating blade c-5-3.

[0075] The third base plate c-5-6 has a third circular hole c-5-6-1 at its center. The edge of the third circular hole c-5-6-1 has a rectangular groove c-5-6-2 along its radial outward. The rectangular groove c-5-6-2 communicates with the circular opening c-5-5-3 at the edge of the second base plate c-5-5, and then communicates with the third flow channel c-5-10 inside the rotating blade c-5-3.

[0076] The diameters of the first connecting pipe c-5-11, the second connecting pipe c-5-12, and the third connecting pipe c-5-13 increase from small to large. Specifically, the first connecting pipe c-5-11 is connected to the bottom of the first base plate c-5-4 and communicates with the first central circular hole c-5-4-1; the second connecting pipe c-5-12 is connected to the bottom of the second base plate c-5-5 and communicates with the second central circular hole c-5-5-1; and the third connecting pipe c-5-13 is connected to the bottom of the third base plate c-5-6 and communicates with the third central circular hole c-5-6-1.

[0077] The three connecting pipes are nested sequentially with gaps between adjacent inner and outer walls. Sealing measures are provided at the connections between the three connecting pipes and the base plate. Finally:

[0078] The first connecting pipe c-5-11 is connected in sequence to the first circular hole c-5-4-1 in the center of the first base plate c-5-4 and the first flow channel c-5-8 inside the rotating blade c-5-3, forming a complete flow channel, namely the LNAPL flow channel, which is used to remove LNAPL.

[0079] 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, which is sequentially connected to the second circular hole c-5-5-1 in the center of the second base plate c-5-5, the groove c-5-5-2, the arc-shaped opening c-5-4-2 in the middle of the first base 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;

[0080] The gap between the inner wall of the third connecting tube c-5-13 and the outer wall of the second connecting tube c-5-12 forms a flow channel, which is sequentially connected to the third circular hole c-5-6-1 at the center of the third base plate c-5-6, the rectangular groove c-5-6-2, the second circular opening c-5-5-3 on the edge of the second base plate c-5-5, the first circular opening c-5-4-3 on the edge of the first base plate c-5-4, and the third flow channel c-5-10 inside the rotating blade c-5-3, forming a complete flow channel, namely the DNAPL flow channel, for discharging DNAPL.

[0081] Separator c-6 contains three outlet channels, which are connected to the three complete flow channels (LNAPL channel, water channel, and DNAPL channel) of rotating structure c-5 respectively. Thus, separator c-6 outputs in three directions: LNAPL is discharged downward through separator c-6, and discharged from LNAPL outlet c-9 through the second NAPL phase separation control valve c-7-2; water containing dissolved organic matter is discharged to the right through separator c-6, and discharged from water outlet c-8 through the first NAPL phase separation control valve c-7-1; DNAPL is discharged to the left through separator c-6, and discharged from DNAPL outlet c-10 through the third NAPL phase separation control valve c-7-3.

[0082] 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 base plate c-5-4, the second base plate c-5-5, and the third base plate c-5-6, and are used to measure the liquid resistivity to monitor the separation purity (LNAPL and DNAPL have high resistivity, while water containing dissolved organic matter has low resistivity). The three electrode groups are powered by three sets 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 example, the first power supply slip ring c-12-1 is disposed between the outer wall of the first connecting tube c-5-11 and the inner wall of the separation tube c-6, the second power supply slip ring c-12-2 is disposed between the outer wall of the second connecting tube c-5-12 and the inner wall of the separation tube c-6, and the third power supply slip ring c-12-3 is disposed between the outer wall of the first connecting tube c-5-13 and the separation tube c-6.

[0083] The NAPL phase-separation motor c-3 is located inside the equipment housing c-2. Its output shaft is connected to the rotating structure c-5 via 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.

[0084] The principle of water and NAPL phase separation is as follows:

[0085] Water and NAPL enter the rotating structure c-5 through the mixed liquid inlet c-1. The mixed liquid then enters the centrifugal zone below 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 rotate the rotating structure c-5 at high speed. The mixed liquid inside the centrifugal zone is driven to rotate at high speed by the rotating blade c-5-3. Since LNAPL has a lower density than water, LNAPL in the mixed liquid will transfer towards the center of the rotating shaft c-13, that is, LNAPL will transfer to the first flow channel c-5-8 through the grid of the rotating blade c-5-3. Similarly, due to DNAP... L has a density greater than water, so DNAPL in the mixed liquid will move away from the center of the rotation axis c-13. That is, LNAPL will be transferred to the third flow channel c-5-10 through the grid of the rotating blade c-5-3. Water is located between LNAPL and DNAPL. Thus, LNAPL, DNAPL and water are separated. From the center of the rotation axis c-13 outwards, the order is LNAPL, water and DNAPL. The inclined sidewall of the rotating shell c-5-2 helps DNAPL to converge at the outer edge of the bottom of the centrifugation zone. The rotating blade c-5-3 has a conical structure at the center with the cone apex facing downwards, which helps LNAPL to converge at the center of the rotation axis at the bottom of the centrifugation zone.

[0086] Compared to water, LNAPL and DNAPL have higher resistivity. The resistivity of LNAPL at position is monitored by the first electrode group c-11-1. When the resistivity reaches the set threshold for separating LNAPL, the second NAPL phase separation electrically controlled valve c-7-2 opens, and LNAPL flows through the LNAPL channel and is discharged from LNAPL outlet c-9. Similarly, the resistivity of DNAPL is monitored by the third electrode group c-11-3. When the resistivity reaches the set threshold for separating DNAPL, the third NAPL phase separation electrically controlled valve c-7-3 opens, and DNAPL flows through the DNAPL channel and is discharged from DNAPL outlet c-10. The resistivity of water is monitored by the second electrode group c-11-2. When the resistivity reaches the set threshold for separating water, the first NAPL phase separation electrically controlled valve c-7-1 opens, and water containing dissolved organic matter flows through the water channel and is discharged from water outlet c-8.

[0087] The vacuum pumping device d provides negative pressure for multiphase extraction construction. It 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 separator b, and the gas outlet is connected to the VOC treatment device e. The vacuum pumping device d extracts the gas containing volatile organic compounds from the tank b-2 of the gas phase separator b, which is then purified by the VOC treatment device e before being discharged.

[0088] The control cabinet f automates the multiphase extraction and separation operation. It is connected to the solid-phase separation device a, gas-phase separation device b, NAPL phase separation device c, and vacuum pumping equipment d. It acquires information from flow meters, level gauges, pressure sensors, and electrode arrays, and operates the electrically controlled valves, motors, centrifugal pumps, and vacuum pumping equipment d. Specifically:

[0089] The control cabinet f is connected to the flow meter a-4, solid phase separation level gauge a-6, electrically controlled valves (first solid phase separation electrically controlled valve a-5-1, second solid phase separation electrically controlled valve a-5-2, third solid phase separation electrically controlled valve a-5-3, fourth solid phase separation electrically controlled valve a-5-4), and solid phase separation motor a-9 of the solid phase separation device a. It acquires the extraction flow rate detected by the flow meter a-4 and the liquid level height detected by the solid phase separation level gauge a-6, and controls the electrically controlled valves and solid phase separation motor a-9 to automatically clean the sediment on the filter screen. The specific automatic control process is as follows: Figure 13 As shown;

[0090] When the extraction operation begins, the control status of each electrical control valve and the solid phase separation motor a-9 is as follows: the second solid phase separation electrical control valve a-5-2 is opened, the first solid phase separation electrical control valve a-5-1, the third solid phase separation electrical control valve a-5-3, and the fourth solid phase separation electrical 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 and transported to the gas phase separation device b, and the extraction flow rate is monitored by the flow meter a-4;

[0091] 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 initiated. The cleaning process is as follows:

[0092] Open the first solid-phase separation electrically controlled valve a-5-1 to return 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. Monitor the liquid level using the solid-phase separation level gauge a-6. When the liquid level is lower than the set solid-phase separation liquid level threshold, close the second solid-phase separation electrically controlled valve a-5-2 and open the third and fourth solid-phase separation electrically controlled valves a-5-3 and a-5-4. External water is sprayed onto the filter screen through the spray pipe a-7 to wash away the silt. The solid-phase separation motor a-9 starts. During operation, the sludge containing adsorbed organic matter is discharged through the opening of the fourth solid phase separation electrically controlled valve a-5-4 via the spiral blades a-8. When the rinsing time reaches the set rinsing duration, 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 stops running, ending the cleaning process. After the cleaning process is completed, if it is necessary to continue the extraction operation, the states of each electrically controlled valve and the solid phase separation motor a-9 are controlled to the states at the beginning of the extraction operation, and the extraction operation continues.

[0093] Control cabinet f is connected to the gas phase separation level gauge b-5, pressure sensor b-4, gas phase separation electrically controlled valve b-3, and centrifugal pump b-7 of the gas phase separation device b. It acquires the pressure data from pressure sensor b-4 and the liquid level detected by gas phase separation level gauge b-5. It controls the gas phase separation electrically controlled valve b-3 to adjust the pressure inside tank b-2 and controls the centrifugal pump b-7 to pump the water and NAPL from tank b-2 to the NAPL phase separation device c. The specific automatic control process is as follows: Figure 14 As shown;

[0094] When the extraction operation begins, centrifugal pump b-7 stops, NAPL phase separation device c stops, and the liquid level in tank b-2 is monitored by gas phase separation 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, centrifugal pump b-7 runs, and NAPL phase separation device c runs synchronously. When the gas phase separation level gauge b-5 detects that the liquid level in tank b-2 is lower than the lower limit of the set gas phase separation liquid level range, or when it is necessary to stop the extraction operation, centrifugal pump b-7 stops, NAPL phase separation device c stops, and the NAPL phase separation process ends.

[0095] The control cabinet f is connected to the electrode groups (first electrode group c-11-1, second electrode group c-11-2, third electrode group c-11-3), electrically controlled valves (first NAPL phase separation electrically controlled valve c-7-1, second NAPL phase separation electrically controlled valve c-7-2, third NAPL phase separation electrically controlled valve c-7-3), and NAPL phase separation motor c-3 of the NAPL phase separation device c. It acquires the resistivity information of the electrode groups and controls the electrically controlled valves and NAPL phase separation motor c-3 to achieve the 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: Figure 15 As shown;

[0096] When the NAPL phase separation process begins, the NAPL phase separation motor c-3 starts 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. The resistivity is monitored through the first electrode group c-11-1, the second electrode group c-11-2, and the third electrode group c-11-3.

[0097] When the resistivity detected by the first electrode group c-11-1 reaches the resistivity set threshold for separating LNAPL, the second NAPL phase separation electronic valve c-7-2 opens to discharge the LNAPL.

[0098] When the resistivity detected by the third electrode group c-11-3 reaches the set threshold for DNAPL separation, the third NAPL phase separation electronic valve c-7-3 opens to discharge the DNAPL.

[0099] When the resistivity detected by the second electrode group c-11-2 reaches the set threshold for the resistivity of the separated water, the first NAPL phase separation electrically controlled valve c-7-1 opens to discharge the water containing dissolved organic matter.

[0100] If the NAPL phase separation process ends, the NAPL phase separation motor c-3 will stop 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 will be closed.

[0101] Control cabinet f is connected to vacuum pumping equipment d and controls the operation of the vacuum pumping equipment. The specific automatic control process is as follows: Figure 16 As shown;

[0102] Before the extraction operation begins, the extraction negative pressure range is set in the control cabinet. The pressure is negative, including the lower limit and the upper limit of the gas pressure range. The extraction negative pressure is adjusted to be lower than the upper limit of the set gas pressure range by the vacuum pumping equipment d, and the extraction negative pressure is adjusted to be higher than the lower limit of the set gas pressure range by the gas phase separation electronic control valve b-3.

[0103] When the extraction operation begins, the vacuum pumping equipment d starts operating, the gas phase separation electrically controlled valve b-3 closes, and the gas pressure inside the tank b-2 is monitored by the pressure sensor b-4. When the gas pressure inside the tank b-2 is lower than the upper limit of the set pressure range, the vacuum pumping equipment d stops operating. If the gas pressure inside the tank b-2 is lower than the lower limit of the set pressure range, the gas phase separation electrically controlled valve b-3 opens, increasing the gas pressure until it exceeds the lower limit of the set pressure range. Then, it is determined whether to end the extraction operation. If the extraction operation is not to be ended, the gas phase separation electrically controlled valve b-3 closes, and the pressure sensor b-4 returns to monitoring the gas pressure status inside the tank b-2. If the extraction operation is to be ended, the program ends.

[0104] Furthermore, the control cabinet is equipped with a touch screen, which has buttons for parameter setting, start extraction, and end extraction, for human-machine interaction.

[0105] The above-mentioned method of using an automated multiphase extraction and separation system for contaminated sites includes the following steps:

[0106] Step 1: Install the system and set the parameters via the control cabinet touch screen.

[0107] Step 2: Start Extraction. Click the "Start Extraction" button on the control cabinet touchscreen to automatically perform multiphase extraction and separation. The extraction will end once the operation is complete.

[0108] Step 3: End extraction. Click the "End Extraction" button on the control cabinet touchscreen. The system will stop running and automatically release the extraction negative pressure.

[0109] In application, 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 electrically controlled valve a-5-3 is connected to an external water source.

[0110] Before the multiphase extraction and separation operation begins, the status settings of each electrical control valve are as follows: the first solid phase separation electrical control valve a-5-1, the third solid phase separation electrical control valve a-5-3, and the fourth solid phase separation electrical control valve a-5-4 of solid phase separation device a are closed, and the second solid phase separation electrical control valve a-5-2 is open; the gas phase separation electrical control valve b-3 of gas phase separation device b is closed; the first NAPL phase separation electrical control valve c-7-1, the second NAPL phase separation electrical control valve c-7-2, and the third NAPL phase separation electrical control valve c-7-3 of NAPL phase separation device c are closed.

[0111] Specifically, in step 1, parameters are set via the control cabinet touchscreen, including the extraction negative pressure range (lower limit of the gas pressure range, upper limit of the gas pressure range), flow rate threshold, solid phase separation liquid level threshold, cleaning time, gas phase separation liquid level range (lower limit of the gas phase separation liquid level range, upper limit of the gas phase separation liquid level range), resistivity threshold for separating LNAPL, resistivity threshold for separating DNAPL, and resistivity threshold for separating water, etc.

[0112] After setting the parameters in the control cabinet, click the "Start Extraction" button on the touchscreen, and the system will begin the extraction process.

[0113] Specifically, step 2 includes:

[0114] 2.1: When the vacuum suction device d is in operation, the air in the tank b-2 of the gas phase separation device b is extracted to reach the set extraction negative pressure range. Under the action of vacuum pressure, the water, air, silt and NAPL extract containing pollutants in the extraction well are sucked into the extract inlet a-1 of the solid phase separation device a.

[0115] 2.2: After the extract is filtered through multiple stages of filters with decreasing pore sizes in the solid phase separation device a (first filter a-3-1, second filter a-3-2, third filter a-3-3, and fourth filter a-3-4 in sequence), the silt containing adsorbed organic matter remains on the filter screens, while water, air, and NAPL enter the gas phase separation device b.

[0116] After the equipment has been running for a certain period of time, the filter screen becomes clogged with silt, 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 silt on the filter screen.

[0117] 2.3: Water, air and NAPL containing pollutants enter the gas phase separation device b through the gas phase separation inlet b-1. The water and NAPL are located at the lower part of the tank b-2, and the air at the top is extracted by the vacuum pumping device d through the gas outlet b-6 and discharged into the VOC treatment device e. After purification, it is discharged.

[0118] When the gas phase separation level gauge b-5 detects that the liquid level in tank b-2 has reached 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, separating LNAPL, DNAPL and water.

[0119] 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 will stop running and automatically open the gas phase separation electronically controlled valve b-3, so that the inside of the tank b-2 returns to the normal pressure state.

[0120] The above description is merely a description of preferred embodiments of this application and is not intended to limit the scope of this application in any way. Any changes or modifications made by those skilled in the art based on the above-disclosed technical content should be considered as equivalent and valid embodiments and fall within the scope of protection of the technical solution of this application.

Claims

1. A NAPL phase separation device, characterized in that, Used to separate water containing dissolved organic matter, light non-aqueous liquid LNAPL, and heavy non-aqueous liquid DNAPL; The NAPL phase separation device includes: a mixed liquid inlet (c-1), a 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 electrically controlled valve (c-7-1), a second NAPL phase separation electrically controlled valve (c-7-2), a third NAPL phase separation electrically controlled valve (c-7-3), a water outlet (c-8), an LNAPL outlet (c-9), and a DNAPL outlet (c-10), wherein: The mixed liquid inlet (c-1) is located at the upper end of the rotating structure (c-5); The rotating structure (c-5) is installed inside the equipment housing (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 pipe (c-6). The rotating structure (c-5) is used for high-speed rotation to separate water, light non-aqueous liquid LNAPL, and heavy non-aqueous liquid DNAPL. It includes a bearing (c-5-1), a rotating housing (c-5-2), rotating blades (c-5-3), a first base plate (c-5-4), a second base plate (c-5-5), a third base 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) has a frustum-shaped structure, narrower at the top and wider at the bottom. The rotating housing (c-5-2) and the first base plate (c-5-1)... -4) A groove is provided, the lower part of the rotating blade (c-5-3) is inserted into the groove of the first base 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 base plate (c-5-4), the second base plate (c-5-5), and the third base plate (c-5-6) are fixed into a whole by bolts. A centrifugal zone inlet and three independent flow channels are formed inside the rotating structure. Two bearings (c-5-1) are installed at the top and bottom of the whole respectively, thus forming a rotating structure. The separator (c-6) has three channel outlets, which are connected to the three flow channels of the rotating structure (c-5) respectively, so that the separator (c-6) outputs in three ways.

2. The NAPL phase separation device as described in claim 1, characterized in that, The NAPL phase-separated motor (c-3) is located inside the equipment housing (c-2), and its output shaft is connected to the rotating structure (c-5) via the NAPL phase-separated belt (c-4). The NAPL phase-separated motor (c-3) provides power to the rotating structure (c-5) through the NAPL phase-separated belt (c-4).

3. The NAPL phase separation device as described in claim 1, characterized in that, The separation tube (c-6) has three outputs: LNAPL is discharged downward through the separation tube (c-6) and then discharged from the LNAPL outlet (c-9) through the second NAPL phase separation electrically controlled valve (c-7-2); water containing dissolved organic matter is discharged to the right through the separation tube (c-6) and then discharged from the water outlet (c-8) through the first NAPL phase separation electrically controlled valve (c-7-1); DNAPL is discharged to the left through the separation tube (c-6) and then discharged from the DNAPL outlet (c-10) through the third NAPL phase separation electrically controlled valve (c-7-3).

4. The NAPL phase separation device as described in claim 1, characterized in that, It also includes 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); 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 base plate (c-5-4), the second base plate (c-5-5), and the third base plate (c-5-6) of the rotating structure (c-5); 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 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), respectively.

5. The NAPL phase separation device as described in claim 1, characterized in that, The rotating structure (c-5) is specifically as follows: A centrifugal zone inlet (c-5-7) is provided between the top edge of the rotating blade (c-5-3) and the rotating outer shell (c-5-2); The rotating blade (c-5-3) has a grid structure and is provided with a first flow channel (c-5-8) and a second flow channel (c-5-9) inside. A third flow channel (c-5-10) is provided 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). First base plate (c-5-4): It has a first circular hole (c-5-4-1) in the center, which communicates with the first flow channel (c-5-8) inside the rotating blade (c-5-3); it has an arc-shaped opening (c-5-4-2) in the middle, which communicates with the second flow channel (c-5-9) inside the rotating blade (c-5-3); it has a first circular opening (c-5-4-3) at the edge, which communicates with the third flow channel (c-5-10) inside the rotating blade (c-5-3); The second base plate (c-5-5) has a second circular hole (c-5-5-1) at its center, and a groove (c-5-5-2) around the second circular hole (c-5-5-1). The groove (c-5-5-2) is opposite to and communicates with the arc-shaped opening (c-5-4-2) of the first base plate (c-5-4), and then communicates with the second flow channel (c-5-9) inside the rotating blade (c-5-3). The edge has a second circular opening (c-5-5-3), which communicates with the first circular opening (c-5-4-3) at the edge of the first base plate (c-5-4), and then communicates with the third flow channel (c-5-10) inside the rotating blade (c-5-3). The third base plate (c-5-6) has a third circular hole (c-5-6-1) at its center. The edge of the third circular hole (c-5-6-1) has a rectangular groove (c-5-6-2) along its radial outward edge. The rectangular groove (c-5-6-2) communicates with the circular opening (c-5-5-3) at the edge of the second base plate (c-5-5), and then communicates with the third flow channel (c-5-10) inside the rotating blade (c-5-3). The diameters of the first connecting pipe (c-5-11), the second connecting pipe (c-5-12), and the third connecting pipe (c-5-13) increase from small to large. Specifically, the first connecting pipe (c-5-11) is connected to the bottom of the first base plate (c-5-4) and communicates with the first central circular hole (c-5-4-1), the second connecting pipe (c-5-12) is connected to the bottom of the second base plate (c-5-5) and communicates with the second central circular hole (c-5-5-1), and the third connecting pipe (c-5-13) is connected to the bottom of the third base plate (c-5-6) and communicates with the third central circular hole (c-5-6-1). The three connecting pipes are nested sequentially with gaps between adjacent inner and outer walls. Sealing measures are provided at the connections between the three connecting pipes and the base plate. Finally: The first connecting pipe (c-5-11) is connected in sequence to the first circular hole (c-5-4-1) in the center of the first base 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, which is used to remove LNAPL. 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, which is sequentially connected to the second circular hole (c-5-5-1) and groove (c-5-5-2) in the center of the second base plate (c-5-5), the arc-shaped opening (c-5-4-2) in the middle of the first base plate (c-5-4), and the second flow channel (c-5-9) inside the rotating blade (c-5-3) to form a complete flow channel, i.e., a water flow channel, for discharging water containing dissolved organic matter; The gap between the inner wall of the third connecting tube (c-5-13) and the outer wall of the second connecting tube (c-5-12) forms a flow channel, which is sequentially connected to the third circular hole (c-5-6-1) at the center of the third base 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 base plate (c-5-5), the first circular opening (c-5-4-3) at the edge of the first base plate (c-5-4), and the third flow channel (c-5-10) inside the rotating blade (c-5-3), forming a complete flow channel, namely the DNAPL flow channel, for discharging DNAPL.

6. The NAPL phase separation device as described in claim 4, characterized in that, The LNAPL, DNAPL, and water separation process based on the rotational structure (c-5) includes: Water and NAPL enter the rotating structure (c-5) through the mixed liquid inlet (c-1). The mixed liquid enters the centrifugal zone below the rotating blade (c-5-3) through the gap 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. Since LNAPL has a lower density than water, LNAPL in the mixed liquid will transfer towards the center of the rotation axis (c-13), that is, LNAPL will transfer towards the first flow channel (c-5-8) through the grid of the rotating blades (c-5-3). Similarly, since DNAPL has a higher density than water, DNAPL in the mixed liquid will move away from the center of the rotation axis (c-13), that is, LNAPL will transfer towards the third flow channel (c-5-10) through the grid of the rotating blades (c-5-3). Water is located between LNAPL and DNAPL. Thus, LNAPL, DNAPL and water are separated, and from the center of the rotation axis outwards, the order is LNAPL, water, and DNAPL. The resistivity of LNAPL is monitored by the first electrode group (c-11-1). When the resistivity reaches the set threshold for separating LNAPL, the second NAPL phase separation electrically controlled valve (c-7-2) opens, and LNAPL is discharged through LNAPL outlet (c-9). The resistivity of DNAPL is monitored by the third electrode group (c-11-3). When the resistivity reaches the set threshold for DNAPL separation, the third NAPL phase separation electronic control valve (c-7-3) opens, and DNAPL is discharged through the DNAPL outlet (c-10). The resistivity of the water is monitored by the second electrode group (c-11-2). When the resistivity of the water reaches the set threshold for separation, the first NAPL phase separation electrically controlled valve (c-7-1) opens, and the water containing dissolved organic matter is discharged through the water outlet (c-8).

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