Supercritical water oxidation heavy metal removal system

Abstract

The utility model discloses a supercritical water oxidation heavy metal removal system, and relates to the field of water treatment devices. The supercritical reactor is communicated with the raw material tank and is used for receiving the wastewater in the raw material tank and carrying out supercritical water oxidation reaction; the liquid alkali adding tank is used for storing alkali liquor; the dosing metering pump is used for conveying alkali liquor in the liquid alkali dosing tank into the raw material tank; the pH value sensor is used for detecting the pH value of the reacted wastewater on line; the pH value sensor and the dosing metering pump are interlocked, and when the pH value sensor detects that the pH value of the reacted wastewater is lower than a preset threshold value, the dosing metering pump is automatically triggered to add alkali liquor; the heavy metal ion sensor is used for detecting the heavy metal content of the reacted wastewater on line. According to the utility model, the pH value sensor is arranged to carry out online pH value detection on the reacted wastewater, and the pH value sensor and the dosing metering pump are arranged in an interlocking manner, so that the purpose of removing heavy metal ions in the wastewater is achieved.

Description

Technical Field

[0001] This utility model relates to the field of water treatment devices, specifically to a supercritical water oxidation system for removing heavy metals. Background Technology

[0002] Supercritical water refers to water at a certain pressure and temperature, where the density of water expanding due to high temperature is exactly the same as the density of water vapor compressed under high pressure. At this point, the liquid and gaseous states of water are indistinguishable, completely mixing to form a new liquid exhibiting a high-pressure, high-temperature state. Supercritical water possesses strong reactivity; when substances requiring treatment are placed in supercritical water and supplemented with oxygen and hydrogen peroxide, they will be oxidized and hydrolyzed. Due to these physicochemical properties, which are completely different from those of water at normal temperature and pressure, supercritical water has broad application prospects in environmental protection, coal gasification, and many other fields.

[0003] Supercritical water oxidation technology uses supercritical water as a medium to decompose organic matter in wastewater or sewage into simple, non-toxic small molecule compounds such as water and carbon dioxide under high temperature and high pressure conditions. Because supercritical water oxidation technology achieves almost 100% removal of organic matter from wastewater or sewage, and because the organic matter is completely oxidized in a fully enclosed environment without secondary pollution, this technology is receiving increasing attention.

[0004] However, the raw materials often contain a large number of heavy metal ions, which cannot be completely removed after supercritical reaction, resulting in wastewater that cannot meet discharge standards. Therefore, how to completely remove heavy metals in the supercritical process has become a challenge for supercritical water oxidation technology. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this invention is to provide a supercritical water oxidation system for removing heavy metals. By installing a pH sensor to monitor the pH of the wastewater after the reaction online and interlocking it with a dosing metering pump, this system solves the problem that heavy metal ions cannot be completely removed after supercritical reactions in existing technologies.

[0006] This invention provides a supercritical water oxidation system for removing heavy metals, the system comprising:

[0007] Raw material tanks are used to store wastewater;

[0008] A supercritical reactor, connected to the raw material tank, is used to receive wastewater and carry out a supercritical water oxidation reaction;

[0009] Liquid alkali dosing tank, used to store alkali solution;

[0010] A dosing metering pump is connected to both the raw material tank and the liquid alkali dosing tank.

[0011] A pH sensor is used to detect the pH of the wastewater after the reaction.

[0012] Heavy metal ion sensor, used to detect the heavy metal content in wastewater after reaction;

[0013] The dosing pump is connected to the pH sensor and is used to transport the alkali solution from the liquid alkali dosing tank to the raw material tank when the pH of the wastewater after the reaction is lower than a preset threshold.

[0014] As one preferred embodiment, the system further includes a pressure-reducing device connected to the supercritical reactor for depressurizing the wastewater after the reaction; wherein...

[0015] The pH sensor is connected to the outlet of the pressure-reducing device and is used to detect the pH of the wastewater after pressure reduction.

[0016] The heavy metal ion sensor is connected to the outlet of the pressure reduction device and is used to detect the heavy metal content of the wastewater after pressure reduction.

[0017] As one of the preferred embodiments, the outlet of the pressure reducing device is connected to both the sewage treatment system and the heavy metal treatment mechanism; a first control valve is installed on the pipeline connecting the pressure reducing device to the sewage treatment system; and a second control valve is installed on the pipeline connecting the pressure reducing device to the heavy metal treatment mechanism.

[0018] As one of the preferred embodiments, the heavy metal treatment mechanism includes a heavy metal reaction buffer, a heavy metal catching agent storage tank, and a heavy metal catching agent dosing pump, wherein the heavy metal catching agent dosing pump is connected to the heavy metal catching agent storage tank and the heavy metal reaction buffer, respectively.

[0019] The heavy metal ion dosing pump is connected to the heavy metal ion sensor and is used to deliver the heavy metal ion in the heavy metal ion storage tank to the heavy metal reaction buffer when the heavy metal content is higher than a preset value.

[0020] As one of the preferred embodiments, the heavy metal reaction buffer includes a reaction vessel body, which is provided with a dosing port, a feed port and a water outlet. A baffle is provided inside the reaction vessel body, and the dosing port and the feed port are both located above the baffle.

[0021] As one of the preferred options, the partition is inclined downwards.

[0022] As one preferred embodiment, a filter plate is provided inside the reactor body, the filter plate is located below the partition, and the water outlet is located below the filter plate.

[0023] As one preferred embodiment, a weight sensor is provided on the filter plate, which is used to detect the weight of impurities above the filter plate.

[0024] As one of the preferred embodiments, the reactor body is provided with a settling zone inside, the settling zone is located below the partition, the settling zone has a conical structure that is larger at the top and smaller at the bottom, the bottom of the conical structure is provided with a slag discharge port, and the water outlet is provided on the side wall of the conical structure.

[0025] Compared with the prior art, this application has the following advantages:

[0026] The system provided in this embodiment of the utility model has a raw material tank connected to a supercritical reactor via a pipeline. Wastewater flows from the raw material tank into the reactor. A liquid alkali dosing tank is connected to a dosing metering pump via a pipeline. The dosing metering pump delivers alkali solution to the raw material tank. An acid-base sensor is installed at the outlet of the supercritical reactor to detect the acidity or alkalinity of the wastewater after the reaction. By precisely controlling the acidity or alkalinity, the precipitation of heavy metal ions is promoted, and their solubility in the wastewater is reduced, thereby improving the removal efficiency. Through the interlocking of the dosing metering pump and the acid-base sensor, real-time monitoring and automatic adjustment of the acidity or alkalinity are achieved, reducing manual intervention and improving the stability and reliability of the treatment process.

[0027] The system provided in this embodiment of the utility model, by setting up a first pipeline connected to the sewage treatment system and a second pipeline connected to the heavy metal treatment mechanism, interlocks the heavy metal ion sensor with the heavy metal precipitator dosing pump. When the heavy metal ion sensor detects that the heavy metal content exceeds the standard, the system automatically triggers the heavy metal precipitator dosing pump to transport the heavy metal precipitator from the storage tank to the heavy metal reaction buffer. When the heavy metal ion sensor detects that the heavy metal content meets the standard, the wastewater is directly transported from the depressurization equipment to the municipal sewage treatment system, which improves the automation level of wastewater treatment, reduces manual intervention, and improves treatment efficiency and safety.

[0028] The system provided in this embodiment of the invention has a downwardly inclined baffle in the heavy metal reaction buffer, which can slow down the flow rate of the heavy metal precipitator and wastewater, increase their residence time in the reactor, and thus provide a longer reaction time to promote the full reaction of the heavy metal precipitator with heavy metal ions. At the same time, the baffle makes the flow path of the heavy metal precipitator and wastewater in the reactor longer, further extending the reaction time and helping to improve the removal rate of heavy metals.

[0029] In summary, the supercritical water oxidation system for removing heavy metals provided by the embodiments of this utility model achieves near-complete removal of heavy metal ions from wastewater by setting up pH and heavy metal ion sensors to monitor the pH and heavy metal content of the wastewater after the reaction, and by interlocking with the dosing metering pump. Attached Figure Description

[0030] To more clearly illustrate the technical solution of this application, the drawings used in the description of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic diagram of the supercritical water oxidation system for removing heavy metals provided in this embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the heavy metal reaction buffer structure provided in Embodiment 1 of this utility model;

[0033] Figure 3 This is a schematic diagram of the heavy metal reaction buffer structure provided in Embodiment 2 of this utility model.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Raw material tank; 2. Supercritical reactor; 3. Liquid alkali dosing tank; 4. Dosing metering pump; 5. pH sensor; 6. Pressure reducing device; 7. Heavy metal ion sensor; 8. First pipeline; 9. Second pipeline; 10. Heavy metal reaction buffer; 11. First control valve; 12. Second control valve; 13. Heavy precipitant storage tank; 14. Heavy precipitant dosing pump; 15. Reactor body; 16. Dosing port; 17. Feed inlet; 18. Water outlet; 19. Baffle plate; 20. Filter plate; 21. Weight sensor; 22. Settling zone; 23. Conical structure; 24. Slag discharge port; 25. Raw material pump. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] Example 1:

[0038] like Figure 1 As shown, Figure 1This is a schematic diagram of a supercritical water oxidation system for removing heavy metals. This embodiment of the invention provides a supercritical water oxidation system for removing heavy metals, comprising: a raw material tank 1 for storing wastewater to be treated; a supercritical reactor 2 connected to the raw material tank 1 for receiving the wastewater in the raw material tank 1 and performing a supercritical water oxidation reaction; a liquid alkali dosing tank 3 for storing alkali solution; a dosing pump 4 for transporting the alkali solution from the liquid alkali dosing tank 3 to the raw material tank 1; a raw material pump 25 for transporting the wastewater from the raw material tank 1 to the supercritical reactor 2; a pH sensor 5 configured to detect the pH of the wastewater after the reaction online; and a heavy metal ion sensor 7 for detecting the heavy metal content of the wastewater after the reaction. The pH sensor 5 and the dosing pump 4 are interlocked; when the pH sensor 5 detects that the pH of the wastewater after the reaction is lower than a preset threshold, the dosing pump 4 will be automatically triggered to add alkali solution.

[0039] Specifically, raw material tank 1 is connected to supercritical reactor 2 via a pipeline. Wastewater flows from raw material tank 1 into supercritical reactor 2 via raw material pump 25. A dosing pump 4 delivers alkaline solution to raw material tank 1. The solubility and precipitation behavior of heavy metal ions are affected by pH. By adjusting the pH, the precipitation of heavy metal ions can be promoted, making them easier to remove from the wastewater. The heavy metal ion sensor 7 is used to detect the heavy metal content in the wastewater after the reaction, ensuring that the treated wastewater meets discharge standards. In this embodiment, the interlocking of pH sensor 5 and dosing pump 4 achieves automated control. When the detected pH is lower than a preset threshold, dosing pump 4 automatically adds alkaline solution to adjust the pH to a suitable range.

[0040] For example, most heavy metals form hydroxide precipitates when the pH is greater than 12. These precipitates are then deposited in the ash residue after the reaction is completed in the supercritical reactor 2, thus removing most of the heavy metals. Therefore, in this embodiment, the preset threshold can be set to 12. The dosing pump 4 is based on volumetric delivery, and the output can be controlled by adjusting the number of reciprocating strokes (stroke frequency) or the volume per stroke. Therefore, the dosing pump 4 can be combined with external sensors and a control system to achieve automated control.

[0041] It is understandable that the process of regulating the drug flow rate is a closed-loop control process. The dosing pump 4 adjusts its control signal by comparing the pH value collected by the pH sensor 5 with a preset threshold. For example, the dosing pump 4 performs PID (Proportional-Integral-Derivative) calculations on the deviation between the collected pH value and the preset threshold to calculate its control signal, thereby adjusting the stroke volume, timing, and stroke frequency of the drug dosing. Since PID regulation is a well-established technology, it will not be described in detail here. Similarly, the control strategy of the heavy precipitant dosing pump 14 described later is the same.

[0042] In this embodiment of the invention, the pH sensor 5 is interlocked with the dosing pump 4 to maintain the pH of the wastewater after the reaction at ≥12. In this embodiment, by precisely controlling the pH, the removal efficiency of heavy metals is significantly improved. Because heavy metal ions are effectively removed, secondary pollution to the environment is reduced. The automated control system reduces manual operation, lowers operational complexity and labor intensity, and precisely controls the amount of chemical reagents used, thus improving the stability and reliability of the entire system.

[0043] As a preferred embodiment of the present invention, it also includes a pressure reducing device 6, which is connected to the supercritical reactor 2 and is configured to reduce the pressure of the wastewater after the reaction in the supercritical reactor 2; an acid-base sensor 5 is installed at the outlet of the pressure reducing device 6 and is used to detect the acidity or alkalinity of the wastewater after the pressure is reduced by the pressure reducing device 6.

[0044] Specifically, under supercritical conditions, organic matter in wastewater is oxidized and decomposed into harmless small molecule compounds. By adjusting the pH, the solubility and precipitation behavior of heavy metal ions can be affected. The products after the supercritical water oxidation reaction have very high pressure, which needs to be reduced by depressurization equipment 6 to facilitate subsequent treatment. By reducing the pressure of the reaction products, excessive pressure load on the subsequent treatment system is avoided, and equipment wear is reduced.

[0045] Furthermore, the outlet of the depressurization device 6 is equipped with the aforementioned heavy metal ion sensor 7, which is configured to detect the heavy metal content of the wastewater after depressurization by the depressurization device 6. For example, the outlet of the depressurization device 6 is also connected to a first pipe 8 and a second pipe 9, one end of each pipe being connected to the depressurization device 6 and the other end to a municipal wastewater treatment system; a heavy metal reaction buffer 10 is connected to the second pipe 9, which is configured to perform a heavy metal removal reaction on the wastewater after depressurization by the depressurization device 6.

[0046] Some heavy metal ions, such as chromium, mercury, cadmium, zinc, copper, nickel, and lead, form stable complexes with organic ligands, making them difficult to remove using traditional chemical precipitation methods. For these difficult-to-remove heavy metals, it is necessary to add chelating agents. These agents have strong chelating properties and are unaffected by the concentration of heavy metal ions. Even if the wastewater contains complex components, they can precipitate all heavy metal ions in the wastewater in one step, allowing the wastewater to meet discharge standards.

[0047] In view of this, in this embodiment, a first control valve 11 is provided on the first pipeline 8, and a second control valve 12 is provided before the inlet of the heavy metal reaction buffer 10 on the second pipeline 9. When the heavy metal ion sensor 7 detects that the heavy metal content meets the standard, the first control valve 11 opens and the second control valve 12 closes; when the heavy metal ion sensor 7 detects that the heavy metal content exceeds the preset value, the first control valve 11 closes and the second control valve 12 opens. It can be understood that the preset value of heavy metal content can be set according to the actual situation.

[0048] In a preferred embodiment of this utility model, it further includes a heavy precipitant storage tank 13 and a heavy precipitant dosing pump 14. The heavy precipitant storage tank 13 is connected to the heavy metal reaction buffer 10 and is used to store the heavy precipitant. The heavy precipitant dosing pump 14 is disposed between the heavy precipitant storage tank 13 and the heavy metal reaction buffer 10 and is used to transport the heavy precipitant in the heavy precipitant storage tank 13 to the heavy metal reaction buffer 10. The heavy metal ion sensor 7 is interlocked with the heavy precipitant dosing pump 14. When the heavy metal ion sensor 7 detects that the heavy metal content exceeds the standard, it will automatically trigger the heavy precipitant dosing pump 14 to add the heavy precipitant.

[0049] Specifically, in the above scheme, the heavy metal reaction buffer 10 further removes heavy metals from the depressurized wastewater to ensure that the heavy metal content in the wastewater meets the discharge standards. A first control valve 11 is installed on the first pipeline 8 to control the flow of wastewater directly into the municipal sewage treatment system. A second control valve 12 is installed on the second pipeline 9 to control the flow of wastewater into the heavy metal reaction buffer 10. A heavy metal ion sensor 7 detects the heavy metal content in the depressurized wastewater and controls the first control valve 11 and the second control valve 12 to different open / closed states based on the detected heavy metal content. The heavy metal precipitant reacts rapidly with heavy metal ions in the wastewater to generate water-insoluble salts, forming flocculent precipitates to achieve the purpose of heavy metal removal.

[0050] Specifically, the system adjusts the wastewater flow direction based on the heavy metal content collected by the heavy metal ion sensor 7. When the heavy metal content exceeds the standard, the wastewater is guided to the heavy metal reaction buffer 10, where a heavy metal precipitator is added to further remove the heavy metals. Through the interlocking setting between the heavy metal ion sensor 7 and the heavy metal precipitator dosing pump 14, when the heavy metal ion sensor 7 detects that the heavy metal content exceeds the standard, the system automatically triggers the heavy metal precipitator dosing pump 14 to transport the heavy metal precipitator from the storage tank to the heavy metal reaction buffer 10. This improves the automation level of wastewater treatment, reduces manual intervention, and enhances treatment efficiency and safety.

[0051] As a preferred embodiment of this utility model, such as Figure 2 As shown, Figure 2A schematic diagram of the heavy metal reaction buffer of this embodiment is shown. The heavy metal reaction buffer 10 includes a reaction vessel body 15, which is provided with a dosing port 16, a feed port 17, and a water outlet 18. A baffle 19 is provided inside the reaction vessel body 15, which is inclined downward. The dosing port 16 and the feed port 17 are both located above the baffle 19. When heavy metal catching agent enters the reaction vessel body 15 through the dosing port 16 and wastewater enters the reaction vessel body 15 through the feed port 17, the baffle 19 is configured to buffer the heavy metal catching agent and wastewater, thereby prolonging the reaction time.

[0052] Specifically, the heavy metal precipitator reacts with the heavy metals in the wastewater within the heavy metal reaction buffer 10. The dosing port 16 is equipped with a multi-channel diversion system to increase the reaction rate. The baffle 19 is tilted downwards to slow the flow rate of the heavy metal precipitator and wastewater, increasing their residence time within the reactor and thus providing a longer reaction time to promote a fuller reaction between the heavy metal precipitator and the heavy metal ions. Both the dosing port 16 and the feed port 17 are located above the baffle 19, ensuring that the heavy metal precipitator and wastewater first contact the baffle 19 upon entering the reactor body 15, which aids in dispersion, increases the mixing area, and improves mixing efficiency.

[0053] It should be noted that the partition 19 can be one partition, two partitions, three partitions, etc. There is no restriction here, as long as it can achieve the purpose of dispersing material flow and extending material reaction time. It can be set according to actual needs.

[0054] For ease of understanding, in this embodiment of the utility model, the partition 19 includes two axially symmetrically arranged plates, both of which are inclined downwards toward the center of the reactor body 15.

[0055] In the embodiments of this utility model, such as Figure 2 As shown, a filter plate 20 is provided inside the reactor body 15. The filter plate 20 is located below the partition 19, and the water outlet 18 is located below the filter plate 20. A weight sensor 21 is provided on the filter plate 20. The weight sensor 21 is used to detect the weight of impurities above the filter plate 20.

[0056] Specifically, the filter plate 20 is used to trap solid impurities in the wastewater, including heavy metal precipitates and other particulate matter, ensuring that the wastewater discharged from the outlet 18 is clear and free of solid impurities. A weight sensor 21 is installed on the filter plate 20 to detect the weight of impurities accumulated on the filter plate 20 in real time. When the heavy metal precipitate reaches a certain weight, the weight sensor 21 can remind the user to remove the filter plate 20 for cleaning.

[0057] Of course, in other embodiments, the filter plate 20 may not be provided for sedimentation, and this is not a limitation here.

[0058] Example 2:

[0059] like Figure 3 As shown, Figure 3 The diagram illustrates the structure of the heavy metal reaction buffer in this embodiment. A settling zone 22 is provided inside the reactor body 15, located below the partition 19. The settling zone 22 at the lower end of the reactor body 15 is a conical structure 23 that gradually decreases in size from top to bottom. A slag discharge port 24 is provided at the bottom of the conical structure 23, and a water outlet 18 is provided on the side wall of the conical structure 23.

[0060] In this embodiment of the invention, the filter plate 20 is removed, and the lower end of the reactor body 15 is configured as a cone-shaped structure 23 that gradually decreases in size from top to bottom. This facilitates the concentration and settling of solid impurities. The settling zone 22 is located below the partition 19, providing a space for solid particles in the wastewater to settle naturally under gravity. The slag discharge port 24 is located at the bottom of the cone-shaped structure 23 to discharge the settled solid impurities, and the water outlet 18 is located on the side wall of the cone-shaped structure 23 to discharge the treated clean wastewater. This structure replaces the filter plate 20, and the cone-shaped structure 23 makes it easier to separate solid impurities from the supernatant, improving the separation efficiency of wastewater treatment.

[0061] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0062] It should also be noted that, in this document, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor should they be construed as indicating or implying relative importance. Moreover, the term "comprising" or any other variations thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device.

[0063] The supercritical water oxidation system for removing heavy metals provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand this application, and the content of this specification should not be construed as limiting this application. Furthermore, those skilled in the art will recognize that various modifications may be made to the specific implementation methods and application scope based on this application. It is neither necessary nor possible to exhaustively list all implementation methods here, but obvious variations or modifications derived therefrom are still within the protection scope of this application.

Claims

1. A supercritical water oxidation system for removing heavy metals, characterized in that the system... include: Raw material tank (1) is used to store wastewater; A supercritical reactor (2) is connected to the raw material tank (1) and is used to receive wastewater and carry out supercritical water oxidation reaction; Liquid alkali dosing tank (3) is used to store alkali solution; A dosing metering pump (4) is connected to the raw material tank (1) and the liquid alkali dosing tank (3), respectively; A pH sensor (5) is used to detect the pH of the wastewater after the reaction. A heavy metal ion sensor (7) is used to detect the heavy metal content in the wastewater after the reaction; The dosing metering pump (4) is connected to the pH sensor (5) and is used to transport the alkaline solution from the liquid alkali dosing tank (3) to the raw material tank (1) when the pH of the wastewater after the reaction is lower than a preset threshold.

2. The supercritical water oxidation system for removing heavy metals according to claim 1, characterized in that, The system also includes a pressure-reducing device (6), which is connected to the supercritical reactor (2) and is used to reduce the pressure of the wastewater after the reaction; wherein, The pH sensor (5) is connected to the outlet of the pressure reducing device (6) and is used to detect the pH of the wastewater after pressure reduction.

3. The supercritical water oxidation system for removing heavy metals according to claim 2, characterized in that, The heavy metal ion sensor (7) is connected to the outlet of the pressure reducing device (6) and is used to detect the heavy metal content of the wastewater after pressure reduction.

4. The supercritical water oxidation system for removing heavy metals according to claim 3, characterized in that, The outlet of the pressure reducing device (6) is connected to the sewage treatment system and the heavy metal treatment mechanism, respectively; The pressure reducing device (6) is connected to the sewage treatment system by a first control valve (11). A second control valve (12) is installed on the pipeline connecting the pressure reducing device (6) and the heavy metal processing mechanism.

5. The supercritical water oxidation system for removing heavy metals according to claim 4, characterized in that, The heavy metal treatment device includes a heavy metal reaction buffer (10), a heavy metal catching agent storage tank (13), and a heavy metal catching agent dosing pump (14), wherein the heavy metal catching agent dosing pump (14) is connected to the heavy metal catching agent storage tank (13) and the heavy metal reaction buffer (10), respectively. The heavy metal ion sensor (7) is connected to the heavy metal ion pump (14) and is used to transport the heavy metal ion in the heavy metal ion storage tank (13) to the heavy metal reaction buffer (10) when the heavy metal content is higher than a preset value.

6. The supercritical water oxidation system for removing heavy metals according to claim 5, characterized in that, The heavy metal reaction buffer (10) includes a reaction vessel body (15), which is provided with a dosing port (16), a feed port (17) and a water outlet (18). A partition (19) is provided inside the reaction vessel body (15), and the dosing port (16) and the feed port (17) are both located above the partition (19).

7. The supercritical water oxidation system for removing heavy metals according to claim 6, characterized in that, The partition (19) is inclined downward.

8. The supercritical water oxidation system for removing heavy metals according to claim 6, characterized in that, The reactor body (15) is equipped with a filter plate (20), which is located below the partition (19), and the outlet (18) is located below the filter plate (20).

9. A supercritical water oxidation system for removing heavy metals according to claim 8, characterized in that, A weight sensor (21) is provided on the filter plate (20), and the weight sensor (21) is used to detect the weight of impurities above the filter plate (20).

10. A supercritical water oxidation system for removing heavy metals according to claim 6, characterized in that, The reactor body (15) is provided with a settling zone (22) inside. The settling zone (22) is located below the partition (19). The settling zone (22) has a cone-shaped structure (23) that is larger at the top and smaller at the bottom. The bottom of the cone-shaped structure (23) is provided with a slag discharge port (24). The water outlet (18) is provided on the side wall of the cone-shaped structure (23).

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