Calcium carbide method vinyl chloride mercury-containing wastewater treatment device

Abstract

The utility model discloses a calcium carbide method vinyl chloride mercury-containing wastewater treatment device, and belongs to the field of wastewater treatment, the calcium carbide method vinyl chloride mercury-containing wastewater treatment device comprises a heating assembly, a separation assembly, a mixing assembly, a filtering assembly, a three-way valve and a product water tank, the heating assembly is communicated with the separation assembly through a pipeline, and the heating assembly is communicated with the mixing assembly for mixing a solution and wastewater through a pipeline; according to the device, by arranging the mixing assembly, the heating assembly, the separating assembly, the filtering assembly and the three-way valve, sodium sulfide is adopted as a desulfurizing agent and is input into the static mixer after being mixed with liquid in the product water pipe, material introduction is little, the safety of the device is improved, chemical reaction heat of all components is fully utilized during equipment operation, and utilization of material heat energy is considered; the energy utilization rate is high, the traditional treatment mode is changed, an alkaline mercury removal process is directly adopted, and the operation risk caused by acid-base reaction is avoided, so that the safety during equipment operation and the overall working efficiency are improved.

Description

Technical Field

[0001] This application belongs to the field of wastewater treatment, specifically relating to a device for treating mercury-containing wastewater from the calcium carbide-based vinyl chloride process. Background Technology

[0002] Wastewater treatment involves using physical, chemical, and biological methods to purify wastewater, reduce pollution, and ultimately achieve wastewater recycling and reuse, making full use of water resources. Currently, in the production process of calcium carbide-based polyvinyl chloride (PVC), mercury-containing catalysts are carried out with the materials, eventually forming mercury-containing wastewater. This type of wastewater needs to be treated by specific equipment to screen and treat the mercury in the wastewater, thereby reducing the impact of the wastewater on the surrounding environment.

[0003] Chinese invention patent CN104230085A discloses a method for treating mercury-containing wastewater in the production of polyvinyl chloride using the calcium carbide method. The method is carried out according to the following steps: First, the mercury-containing wastewater is added to a mercury treatment tank. Diatomaceous earth is added to the mercury treatment tank at a rate of 40 to 60 mg per liter of mercury-containing wastewater and mixed evenly. Sodium hydrosulfide is added to the mercury treatment tank at a rate of 45 to 55 moles per mole of mercury in the mercury-containing wastewater and mixed evenly to obtain a mixed solution.

[0004] The above design treats mercury in wastewater by adding diatomaceous earth and sodium hydrosulfide. However, this method has certain problems in actual use. Specifically, the mercury content in the solution is not fixed, and the amount of reagent added cannot be adjusted in a timely manner according to the mercury content in the wastewater. This can easily lead to unstable mercury removal rate and affect the wastewater treatment efficiency. Utility Model Content

[0005] The purpose of this section is to outline some aspects of the embodiments of this application and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents, and such simplifications or omissions should not be construed as limiting the scope of this application.

[0006] To address the problems mentioned in the background section, this application adopts the following technical solution.

[0007] A mercury-containing wastewater treatment device for vinyl chloride produced by calcium carbide method includes a heating component (1), a separation component (2), a mixing component (3), a filtration component (4), a three-way valve (5), and a product water tank (6). The heating component (1) is connected to the separation component (2) through a pipeline. The heating component (1) is also connected to the mixing component (3) for mixing solution and wastewater through a pipeline. The mixing component (3) is equipped with a feeding pump (34) for inputting sodium sulfide as a desulfurizing agent and a storage tank (35). The sodium sulfide stored in the storage tank (35) is used to separate mercury in the wastewater inside the mixing component (3). The wastewater inside the mixing component (3) is input into the filtration component (4) with filtration function through a pipeline. The external pipeline of the filtration component (4) is equipped with a three-way valve (5) for controlling the opening and closing of the pipeline itself. The three-way valve (5) is connected to the product water tank (6) for storing the filtered wastewater.

[0008] As a preferred technical solution of this application, the mixing component (3) includes a static mixer (31), a solution feed pipe (32), a feeding pipe (33), a feeding pump body (34), a storage tank (35), and a discharge pipe (36). The solution feed pipe (32) is connected to the side of the static mixer (31), and the feeding pipe (33) is connected to the side of the static mixer (31) away from the solution feed pipe (32). The discharge pipe (36) is installed at the top of the static mixer (31) and is connected to the filter component (4). The storage tank (35) is located on the side of the static mixer (31). Sodium sulfide in the storage tank (35) is input into the static mixer (31) through the feeding pump body (34) and the feeding pipe (33). Flow monitoring instruments are installed on the outside of the static mixer (31) and the feeding pipe (33).

[0009] As a preferred technical solution of this application, the main component of the solution stored in the storage tank (35) is sodium sulfide, and the reaction equation is HgCl2+Na2S=HgS↓+2NaCl. The water in the storage tank (35) comes from the filtered water stored in the product water tank (6).

[0010] As a preferred technical solution of this application, the filter assembly (4) includes a first bag filter (41), a second bag filter (42), an inlet pipe (43), and an outlet pipe (44). The first bag filter (41) and the second bag filter (42) are both connected to the static mixer (31) through the outlet pipe (36). The inlet pipe (43) is installed on the side of the first bag filter (41) and the second bag filter (42). The outlet pipe (44) is installed at the top of the first bag filter (41) and the second bag filter (42). The outlet pipe (44) is connected to the three-way valve (5).

[0011] As a preferred technical solution of this application, the first bag filter (41) and the second bag filter (42) have the same structure, and both the first bag filter (41) and the second bag filter (42) use PP filter bags inside.

[0012] As a preferred technical solution of this application, the heating component (1) includes a first heater (11), a second heater (12), a wastewater inlet pipe (13), a connecting pipe (14), and a hot water inlet pipe (15). The first heater (11) is equipped with a wastewater inlet pipe (13) for conveying mercury detection. The connecting pipe (14) is installed on the side of the first heater (11). The second heater (12) is connected to a hot water inlet pipe (15) for inputting converted hot water. The second heater (12) is connected to the separation component (2) through a pipeline. The second heater (12) is connected to the first heater (11) through a pipeline.

[0013] As a preferred technical solution of this application, the temperature inside the first heater (11) rises to 45-60°C and exchanges heat with the liquid from the separation component (2). The mercury-containing alkaline solution after heat exchange exchanges heat with the converted hot water to 80-90°C.

[0014] As a preferred technical solution of this application, the separation component (2) includes a stripping tower (21), an exhaust pipe (22), a vacuum pump (23) and a matching pump body (24). The exhaust pipe (22) is installed at the top of the stripping tower (21), the vacuum pump (23) is installed at the end of the exhaust pipe (22), and the matching pump body (24) is located on the side of the stripping tower (21). The matching pump body (24) is connected to the stripping tower (21) through a pipeline, and the matching pump body (24) is connected to the first heater (11).

[0015] As a preferred technical solution of this application, the three-way valve (5) is provided with three sets of connection ports, one end of which is connected to the filter assembly (4), one end of which is connected to the mixing assembly (3), and one end of which is connected to the product water tank (6). A mercury content detector is installed on the pipeline connecting the three-way valve (5) and the filter assembly (4).

[0016] Compared to existing technologies, the beneficial effects of this application are as follows:

[0017] In this application, by setting up a mixing component, a heating component, a separation component, a filtration component, and a three-way valve, sodium sulfide is used as the desulfurizing agent. After being mixed with the liquid in the product water pipe, it is fed into the static mixer. The amount of material introduced is small, which improves the safety of the device. The equipment makes full use of the heat of chemical reaction of each component during operation and takes into account the utilization of material heat energy, resulting in high energy utilization. This changes the traditional treatment method and directly adopts an alkaline mercury removal process, eliminating the operational risks caused by acid-base reactions. This improves the safety of equipment operation and the overall work efficiency.

[0018] In this application, by setting up multiple sets of flow monitoring instruments and mercury content detectors, and using a cascading adjustment automatic control method in conjunction with a static mixer, the mixing efficiency is improved, the reaction is accelerated, the use of buffer settling tanks is avoided, the process flow is shortened, and the equipment can accurately add the corresponding total amount of desulfurizing agent when treating wastewater during operation, reducing unnecessary pollution and improving the working quality of the equipment itself. Attached Figure Description

[0019] Figure 1 This is a three-dimensional view of the overall structure of this application.

[0020] Figure 2 This is a plan view of the wastewater treatment process structure of this application.

[0021] Figure 3 This is a perspective view of the hybrid component structure of this application.

[0022] Figure 4 This is a schematic diagram of the structure of the filtering component in this application.

[0023] Figure 5 This is a schematic diagram of the heating component and the separation component in this application.

[0024] Figure 6 This is a schematic diagram of the liquid flow direction during the operation of the equipment in this application.

[0025] Figure 7 This is a process flow diagram of the overall equipment in this application.

[0026] The correspondence between the labels and component names in the attached figures is as follows:

[0027] 1. Heating assembly; 11. First heater; 12. Second heater; 13. Wastewater inlet pipe; 14. Connecting pipe; 15. Hot water inlet pipe; 2. Separation assembly; 21. Stripping tower; 22. Exhaust pipe; 23. Vacuum pump; 24. Pump body; 3. Mixing assembly; 31. Static mixer; 32. Solution inlet pipe; 33. Feed pipe; 34. Feed pump body; 35. Storage tank; 36. Discharge pipe; 4. Filtration assembly; 41. First bag filter; 42. Second bag filter; 43. Input pipe; 44. Output pipe; 5. Three-way valve; 6. Product water tank. Detailed Implementation

[0028] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this application. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments. The following embodiments are provided in this application.

[0031] Depend on Figure 1 and Figure 2 The diagram shows the structure of the mercury-containing wastewater treatment device in this embodiment, including a heating component 1, a separation component 2, a mixing component 3, a filtering component 4, a three-way valve 5, and a product water tank 6. The heating component 1 is connected to the separation component 2 via a pipeline, and the heating component 1 is also connected to the mixing component 3, which contains a mixed solution and wastewater, via a pipeline. The mixing component 3 is equipped with a feeding pump 34 for inputting sodium sulfide as a desulfurizing agent and a storage tank 35. The sodium sulfide stored in the storage tank 35 is used to separate mercury from the wastewater inside the mixing component 3. The wastewater inside the mixing component 3 is fed into the filtering component 4, which has a filtration function, via a pipeline. The external pipeline of the filtering component 4 is equipped with a three-way valve 5 that controls the opening and closing of the pipeline itself. The three-way valve 5 is connected to the product water tank 6, which stores the filtered wastewater.

[0032] In operation, the mercury-containing alkaline solution is fed into the heating component 1. The heating component 1 heats the solution, and during this process, it exchanges heat with the liquid inside the separation component 2. The heated solution is then fed back into the separation component 2, where it recovers gas and partially filters impurities. The solution is then pumped back into the heating component 1 via pump 24, and fed into the mixing component 3. The mixing component 3 uses sodium sulfide as a reactant to treat the mercury in the solution. After the mixture has fully reacted, the liquid is filtered through the filter component 4. Finally, the mercury content in the filtered solution is detected by the three-way valve 5. If the mercury content is within acceptable limits, the liquid is fed directly into the product water tank 6 for wastewater treatment. The solution in the product water tank 6 is then fed directly into a salt treatment tank for further processing.

[0033] From the appendix Figure 3As shown, this is a schematic diagram of the structure of the mixing component 3 in this embodiment. The mixing component 3 includes a static mixer 31, a solution inlet pipe 32, a feed pipe 33, a feed pump body 34, a storage tank 35, and a discharge pipe 36. The solution inlet pipe 32 is connected to the side of the static mixer 31, and the feed pipe 33 is connected to the side of the static mixer 31 away from the solution inlet pipe 32. The discharge pipe 36 is installed at the top of the static mixer 31 and is connected to the filter component 4. The storage tank 35 is located on the side of the static mixer 31. Sodium sulfide in the storage tank 35 is input into the static mixer 31 through the feed pump body 34 and the feed pipe 33. Flow monitoring instruments are installed on the outside of the static mixer 31 and the feed pipe 33.

[0034] In use, the liquid, after mixing sodium sulfide and water stored in the product water tank 6, is fed into the static mixer 31 through the feed pump body 34. It mixes and reacts with the liquid output from the heating component 1. During the process of feeding the liquid through the feed pump body 34, the flow monitor of the feed pipe 33 is used to monitor the total amount of input liquid. The static mixer 31 is also equipped with a flow monitor to monitor the solution input into the heating component 1. This allows for reasonable adjustment of the total amount of solution and sodium sulfide entering the static mixer 31, ensuring more thorough mixing of the liquid inside the mixing component 3. Then, with the cooperation of the discharge pipe 36, the liquid inside the static mixer 31 is output to the filter component 4 for subsequent filtration.

[0035] By the attached Figure 3 As shown, the solution stored in the storage tank 35 is mainly composed of sodium sulfide, and the reaction equation is HgCl2 + Na2S = HgS↓ + 2NaCl. The water in the storage tank 35 comes from the filtered water stored in the product water tank 6. Sodium sulfide is used as a desulfurizing agent, and the product water is sent to the salt pond as a raw material for sodium hydroxide. In the production process of sodium hydroxide, sodium sulfide is used as a reducing agent to reduce the content of free chlorine in the brine and prevent the introduction of other materials.

[0036] By the attached Figure 4 As shown, this is a schematic diagram of the structure of the filter assembly 4 in this embodiment. The filter assembly 4 includes a first bag filter 41, a second bag filter 42, an inlet pipe 43, and an outlet pipe 44. The first bag filter 41 and the second bag filter 42 are both connected to the static mixer 31 through the outlet pipe 36. The inlet pipe 43 is installed on the side of the first bag filter 41 and the second bag filter 42. The outlet pipe 44 is installed on the top of the first bag filter 41 and the second bag filter 42 and is connected to the three-way valve 5.

[0037] The first bag filter 41 and the second bag filter 42 have the same structure and can flexibly filter the liquid output from the discharge pipe 36, separating the sediment or impurities in the liquid. Then, through the use of the output pipe 44, the liquid is transported to the three-way valve 5, which is convenient for the components on the side of the three-way valve 5 to be inspected.

[0038] By the attached Figure 4 As shown, the first bag filter 41 and the second bag filter 42 have the same structure, and both the first bag filter 41 and the second bag filter 42 use PP filter bags inside. They operate in an open-closed mode, which is convenient for operation and maintenance. PP filter bags have a long service life and can be reused.

[0039] By the attached Figure 5 As shown, this is a schematic diagram of the structure of the heating component 1 in this embodiment. The heating component 1 includes a first heater 11, a second heater 12, a wastewater inlet pipe 13, a connecting pipe 14, and a hot water inlet pipe 15. The first heater 11 is equipped with a wastewater inlet pipe 13 for conveying mercury-containing detection. The connecting pipe 14 is installed on the side of the first heater 11. The second heater 12 is connected to the side of the hot water inlet pipe 15 for inputting converted hot water. The second heater 12 is connected to the separation component 2 through a pipeline, and the second heater 12 is connected to the first heater 11 through a pipeline.

[0040] In use, the first heater 11 is used to preheat the input mercury-containing alkaline solution. The heated alkaline solution is then fed into the second heater 12. The second heater 12, in conjunction with the hot water in the separation component 2, further heats the alkaline solution. The alkaline solution is then fed into the separation component 2 for processing. The connecting pipe 14 allows the liquid discharged from the separation component 2 to be directly fed into the mixing component 3.

[0041] By the attached Figure 5 As shown, the temperature inside the first heater 11 rises to 45-60°C and exchanges heat with the liquid from the separation component 2. The mercury-containing alkaline solution after heat exchange then exchanges heat with the converted hot water to 80-90°C.

[0042] By the attached Figure 5As shown, this is a schematic diagram of the separation component 2 in this embodiment. The separation component 2 includes a stripping tower 21, an exhaust pipe 22, a vacuum pump 23, and a matching pump body 24. The exhaust pipe 22 is installed at the top of the stripping tower 21, the vacuum pump 23 is installed at the end of the exhaust pipe 22, and the matching pump body 24 is located on the side of the stripping tower 21. The matching pump body 24 is connected to the stripping tower 21 through a pipeline and is also connected to the first heater 11. During use, the vacuum pump 23 is used to recover the incoming gas and discharge the gas directly from the stripping tower 21 through the exhaust pipe 22, which is then transported to the vinyl chloride recovery and reuse facility. After the recovery is completed, the matching pump body 24 is used to re-input the liquid inside the stripping tower 21 into the first heater 11, which facilitates the full delivery of the heating component 1.

[0043] From the appendix Figure 6 As shown, this is a schematic diagram of the structure of the three-way valve 5 in this embodiment. The three-way valve 5 is provided with three sets of connection ports. One end is connected to the filter assembly 4, one end is connected to the mixing assembly 3, and one end is connected to the product water tank 6. A mercury content detector is installed on the pipeline connecting the three-way valve 5 and the filter assembly 4. During use, it can detect the mercury content of the filtered liquid and transport the liquid according to the mercury content in the liquid.

[0044] From the appendix Figures 1 to 7 A method for treating mercury-containing wastewater from the calcium carbide-based vinyl chloride process, using the apparatus of this application, comprises the following steps:

[0045] S1. The mercury-containing alkaline solution is introduced into the heating component 1. The wastewater is heated by the use of the heating component 1, and the temperature rises to 45-60℃. It exchanges heat with the liquid from the separation component 2. The mercury-containing alkaline solution and the converted hot water are introduced into the second heater 12 for heat exchange, reaching 80-90℃. Then the heated mixture is introduced into the separation component 2.

[0046] S2. Through the cooperation of vacuum pump 23 and exhaust pipe 22, the gas entering the top of stripping tower 21 is recovered and fed into vinyl chloride for recycling. Then, steam is fed into one side of stripping tower 21 and exchanged with alkaline solution fed into the second heater 12 in a countercurrent heat exchange. A remote level gauge is installed at the bottom of stripping tower 21 and pump body 24 is used to extract the solution at the bottom of stripping tower 21. After exchanging heat with mercury-containing alkaline solution in the first heater 11, the solution is fed into the mixing component 3 after passing through the flow monitor.

[0047] S3. Through the cooperation of the feeding pump body 34 and the feeding pipe 33, the sodium sulfide solution stored in the storage tank 35 is input into the static mixer 31 through the flow monitoring instrument, and is fully mixed and reacted with the liquid inside the static mixer 31.

[0048] S4. The fully mixed liquid is fed into the first bag filter 41 or the second bag filter 42 through the discharge pipe 36. The first bag filter 41 or the second bag filter 42 is used to filter the impurities in the liquid. The filtered solution enters the product water tank 6 through the three-way valve 5.

[0049] S5 and the three-way valve 5 are equipped with a mercury content detector on their side. The liquid is delivered in a targeted manner according to the mercury content in the liquid. When the mercury content is lower than the set value, the three-way valve 5 opens and the water from the filter assembly 4 enters the product water tank 6. When the mercury content is higher than the set value, the three-way valve 5 opens and the water from the filter assembly 4 returns through the pipeline to mix with the mercury-containing alkaline solution and then enters the mixing assembly 3 for mixing again.

[0050] The above description, in conjunction with specific embodiments, provides a further detailed explanation of this application. It should not be construed that the specific implementation of this application is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of this application, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted in this application.

Claims

1. A device for treating mercury-containing wastewater from the calcium carbide-process vinyl chloride method, characterized in that, The system includes a heating component (1), a separation component (2), a mixing component (3), a filtering component (4), a three-way valve (5), and a product water tank (6). The heating component (1) is connected to the separation component (2) through a pipeline. The heating component (1) is connected to the mixing component (3) for mixing the solution and wastewater through a pipeline. The mixing component (3) is equipped with a feeding pump (34) for inputting sodium sulfide as a desulfurizing agent and a storage tank (35). The sodium sulfide stored in the storage tank (35) is used to separate mercury in the wastewater inside the mixing component (3). The wastewater inside the mixing component (3) is input into the filtering component (4) with a filtering function through a pipeline. The external pipeline of the filtering component (4) is equipped with a three-way valve (5) to control the opening and closing of the pipeline itself. The three-way valve (5) is connected to the product water tank (6) for storing the filtered wastewater.

2. The device for treating mercury-containing wastewater from the calcium carbide-based vinyl chloride process according to claim 1, characterized in that: The mixing assembly (3) includes a static mixer (31), a solution feed pipe (32), a feeding pipe (33), a feeding pump body (34), a storage tank (35), and a discharge pipe (36). The solution feed pipe (32) is connected to the side of the static mixer (31), and the feeding pipe (33) is connected to the side of the static mixer (31) away from the solution feed pipe (32). The discharge pipe (36) is installed at the top of the static mixer (31) and is connected to the filter assembly (4). The storage tank (35) is located on the side of the static mixer (31). Sodium sulfide in the storage tank (35) is fed into the static mixer (31) through the feeding pump body (34) and the feeding pipe (33). Flow monitoring instruments are installed on the outside of the static mixer (31) and the feeding pipe (33).

3. The device for treating mercury-containing wastewater from the calcium carbide-based vinyl chloride process according to claim 1, characterized in that: The solution stored in the storage tank (35) is mainly sodium sulfide, and the reaction equation is HgCl2+Na2S=HgS↓+2NaCl. The water in the storage tank (35) comes from the filtered water stored in the product water tank (6).

4. The device for treating mercury-containing wastewater from the calcium carbide-based vinyl chloride process according to claim 1, characterized in that: The filter assembly (4) includes a first bag filter (41), a second bag filter (42), an inlet pipe (43), and an outlet pipe (44). The first bag filter (41) and the second bag filter (42) are both connected to the static mixer (31) through the outlet pipe (36). The inlet pipe (43) is installed on the side of the first bag filter (41) and the second bag filter (42). The outlet pipe (44) is installed at the top of the first bag filter (41) and the second bag filter (42). The outlet pipe (44) is connected to the three-way valve (5).

5. The device for treating mercury-containing wastewater from the calcium carbide-based vinyl chloride process according to claim 4, characterized in that: The first bag filter (41) and the second bag filter (42) have the same structure, and both the first bag filter (41) and the second bag filter (42) use PP filter bags inside.

6. The device for treating mercury-containing wastewater from the calcium carbide-based vinyl chloride process according to claim 1, characterized in that: The heating assembly (1) includes a first heater (11), a second heater (12), a wastewater inlet pipe (13), a connecting pipe (14), and a hot water inlet pipe (15). The first heater (11) is equipped with a wastewater inlet pipe (13) for conveying mercury detection. The connecting pipe (14) is installed on the side of the first heater (11). The second heater (12) is connected to a hot water inlet pipe (15) for inputting converted hot water. The second heater (12) is connected to the separation assembly (2) through a pipeline. The second heater (12) is connected to the first heater (11) through a pipeline.

7. The device for treating mercury-containing wastewater from the calcium carbide-based vinyl chloride process according to claim 6, characterized in that: The temperature inside the first heater (11) rises to 45-60°C and exchanges heat with the liquid from the separation component (2). The mercury-containing alkaline solution after heat exchange exchanges heat with the converted hot water to 80-90°C.

8. The device for treating mercury-containing wastewater from the calcium carbide-based vinyl chloride process according to claim 1, characterized in that: The separation component (2) includes a stripping tower (21), an exhaust pipe (22), a vacuum pump (23), and a matching pump body (24). The top of the stripping tower (21) is equipped with an exhaust pipe (22), the vacuum pump (23) is installed at the end of the exhaust pipe (22), and the matching pump body (24) is located on the side of the stripping tower (21). The matching pump body (24) is connected to the stripping tower (21) through a pipeline, and the matching pump body (24) is connected to the first heater (11).

9. The device for treating mercury-containing wastewater from the calcium carbide-based vinyl chloride process according to claim 6, characterized in that: The three-way valve (5) is provided with three sets of connection ports, one end of which is connected to the filter assembly (4), one end of which is connected to the mixing assembly (3), and one end of which is connected to the product water tank (6). A mercury content detector is installed on the pipeline connecting the three-way valve (5) and the filter assembly (4).

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