Industrial wastewater denitrification treatment device

Abstract

The utility model provides an industrial wastewater denitrification treatment device which comprises a carrying table, a primary filtration module is mounted on one side of the top of the carrying table, an ion exchange module is mounted on the other side of the top of the carrying table, a treatment cylinder is mounted in the center of the top of the carrying table, and a top cover is arranged at the top of the treatment cylinder. Compared with the prior art, the device disclosed by the utility model has the following beneficial effects that the filter plate and the activated carbon filter screen of the primary filter box can effectively remove impurities and part of pollutants in wastewater, so that good conditions are provided for subsequent reaction; due to the special design of the stirring assembly, sufficient mixing of wastewater and chemicals is achieved, and the struvite generation efficiency is improved; the ion exchange resin plate further removes residual nutrient substances, so that the denitrification treatment is more thorough, the quality of treated wastewater is better, the risk of eutrophication of a water body is effectively reduced, nitrogen and phosphorus are removed by generating struvite, and meanwhile, the recycling of resources is realized.

Description

Technical Field

[0001] This utility model is an industrial wastewater denitrification treatment device, belonging to the field of wastewater treatment. Background Technology

[0002] With the acceleration of industrialization, the discharge of industrial wastewater continues to increase. Nitrogen, as a key pollutant causing eutrophication, poses a serious threat to the ecological environment. Currently, industrial wastewater denitrification technologies mainly include biological methods, physicochemical methods, and chemical precipitation methods. Although biological methods have advantages such as low treatment cost and environmental friendliness, they have long treatment cycles, are subject to stringent requirements for water quality and temperature, and are less efficient when treating high-concentration nitrogen-containing wastewater. Physicochemical methods, such as stripping and adsorption, have problems such as unstable treatment effects and easy generation of secondary pollution. Chemical precipitation methods remove nitrogen by adding chemical agents to precipitate nitrogen. Among them, the method of using magnesium salts, phosphates and ammonium ions to react to form struvite (magnesium ammonium phosphate, MAP) has become a research hotspot because it can simultaneously achieve nitrogen and phosphorus removal and resource recovery.

[0003] Existing industrial wastewater denitrification treatment devices based on struvite formation often lack effective methods for removing impurities and pollutants in the pretreatment stage. Large particulate impurities and some organic pollutants in the wastewater can interfere with subsequent reactions, resulting in low struvite formation efficiency and easy clogging of equipment pipelines. During the reaction process, traditional stirring components generally adopt a single drive method and blade design, with all stirring parts rotating at basically the same speed and direction. Usually, there is only a single stirring direction, which may be horizontal or vertical. It is difficult to stir the wastewater in both vertical and horizontal directions at the same time. Therefore, it takes a long time to achieve complete mixing, which affects the reaction rate and the crystallization effect of struvite. The treated wastewater still contains a lot of nutrients, making it difficult to meet strict discharge standards. Therefore, it is necessary to design an industrial wastewater denitrification treatment device. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an industrial wastewater denitrification treatment device to solve the problems mentioned in the background technology.

[0005] To achieve the above object, the utility model is realized through the following technical solutions: An industrial wastewater denitrification treatment device includes a carrier platform. On one side of the top of the carrier platform, a primary filtration module is installed, and on the other side of the top of the carrier platform, an ion exchange module is installed. At the central position of the top of the carrier platform, a treatment cylinder is installed, and a top cover is provided at the top of the treatment cylinder. At the central position of the top of the top cover, a mounting frame is provided, and a stirring component is installed on the mounting frame. At both ends of the top of the top cover, a magnesium salt feeding port and a phosphate feeding port are respectively opened. At the bottom of the primary filtration module close to the treatment cylinder, an infusion pump is installed, and the output end of the infusion pump is connected to the treatment cylinder through a conduit. At the bottom of the treatment cylinder, a discharge port is provided.

[0006] Further, the primary filtration module includes a primary filtration box and a filter plate and an activated carbon filter screen arranged inside the primary filtration box. An inlet is opened at the top of the primary filtration box, and the filter plate and the activated carbon filter screen are inserted into the primary filtration box in sequence from top to bottom. Sealing rubber rings are provided at the insertion joints of the filter plate and the activated carbon filter screen with the primary filtration box.

[0007] Further, the stirring component includes a first stirring pipe, a second stirring pipe and a stirring member. The second stirring pipe penetrates through the inside of the first stirring pipe, and spiral conveying blades are arranged on the outer side of the first stirring pipe. A first auxiliary bevel gear is installed at the top of the first stirring pipe, a second auxiliary bevel gear is provided at the top of the second stirring pipe, and stirring members are arranged on both sides of the second stirring pipe below the first stirring pipe. The top of the second stirring pipe is connected to a liquid inlet pipe through a rotary joint.

[0008] Further, a support ring is installed inside the discharge port, and the second stirring pipe penetrates through the support ring. The inner diameter of the support ring is in line with the outer diameter of the second stirring pipe, and limiting rings are arranged on the second stirring pipe at both the upper and lower ends of the support ring. The bottom of the second stirring pipe is connected to a cleaning frame in a "U" shape structure, and the outer wall of the cleaning frame is in contact with the inner wall of the discharge port.

[0009] Further, the mounting frame is designed in a "C" shape, and upper and lower ring bodies are respectively welded to the two horizontal ends of the mounting frame. The second stirring pipe penetrates through the upper ring body, and the outer diameter of the second stirring pipe is in line with the inner diameter of the upper ring body. The first stirring pipe penetrates through the lower ring body, and the outer diameter of the first stirring pipe is in line with the inner diameter of the lower ring body.

[0010] Further, a driving motor is fixed on the outer side of the mounting frame, and a main bevel gear is installed on the inner side of the mounting frame. The output end of the driving motor is connected to the main bevel gear. A first auxiliary bevel gear meshing with the main bevel gear is installed on the first stirring pipe above the lower ring body, and a second auxiliary bevel gear meshing with the main bevel gear is installed on the second stirring pipe below the upper ring body.

[0011] Furthermore, the stirring component includes a stirring frame, two hollow frames connected to the second stirring tube, and a silicone strip. The stirring frame is connected to the side of the hollow frame near the second stirring tube, and spray nozzles are evenly opened on the side of the hollow frame near the second stirring tube. A silicone strip is inserted into the outer side of the hollow frame, and the silicone strip is in contact with the inner wall of the processing cylinder.

[0012] Furthermore, a filter seat is connected to one side of the discharge port, and a filter screen is inserted into the side of the filter seat near the processing cylinder. The ion exchange module includes an ion exchange box and an ion exchange resin plate inserted into the ion exchange box. A three-way valve is connected to the side of the filter seat near the ion exchange box through a conduit, and the top of the three-way valve is connected to the ion exchange box through a conduit.

[0013] The beneficial effects of this utility model are:

[0014] The filter plates and activated carbon screens in the primary filter box effectively remove impurities and some pollutants from the wastewater, providing favorable conditions for subsequent reactions. The spiral conveying blades on the outside of the first stirring tube of the stirring assembly drive the wastewater to circulate vertically within the treatment cylinder, forming a vertical water circulation system that quickly mixes the upper and lower layers of liquid, breaking up the stratification of the liquid within the treatment cylinder. Meanwhile, the stirring elements on both sides of the second stirring tube stir the wastewater horizontally, causing it to flow laterally. This interweaves with the vertical flow formed by the first stirring tube, creating a three-dimensional stirring effect. The main bevel gear meshes with both the first and second auxiliary bevel gears, allowing the first and second stirring tubes to rotate at different speeds and directions, achieving differentiated stirring. This special design ensures thorough mixing of wastewater and reagents, improving the efficiency of struvite formation. The ion exchange resin plate further removes residual nutrients, making denitrification more thorough and resulting in better wastewater quality. This effectively reduces the risk of eutrophication and achieves denitrification and phosphorus removal while simultaneously recycling resources through struvite formation.

[0015] The mixing assembly uses differential mixing to rotate the first and second mixing tubes at different speeds. Combined with the spiral conveyor blades and mixing components, it enhances the flow and mixing of the liquid from multiple dimensions, greatly shortening the reaction time, increasing the amount of struvite generated per unit time, and improving the overall processing efficiency of the device. The cleaning rack at the bottom of the second mixing tube can rotate with the second mixing tube to ensure unobstructed discharge and clean the filter screen, preventing blockage caused by struvite sedimentation. Attached Figure Description

[0016] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0017] Figure 1This is a schematic diagram of the structure of an industrial wastewater denitrification treatment device according to the present invention;

[0018] Figure 2 This is a schematic diagram of the stirring assembly structure of an industrial wastewater denitrification treatment device according to the present invention;

[0019] Figure 3 This is a schematic diagram of the stirring component structure of an industrial wastewater denitrification treatment device according to the present invention;

[0020] Figure 4 This is a schematic diagram of the first stirring tube structure of an industrial wastewater denitrification treatment device according to the present invention;

[0021] Figure 5 This is a schematic diagram of the mounting frame structure of an industrial wastewater denitrification treatment device according to the present invention;

[0022] In the diagram: 1. Platform; 2. Primary filter box; 3. Filter plate; 4. Activated carbon filter screen; 5. Inlet; 6. Infusion pump; 7. Top cover; 8. Processing cylinder; 9. Stirring assembly; 10. Inlet pipe; 11. Magnesium salt inlet; 12. Phosphate inlet; 13. Ion exchange box; 1301. Ion exchange resin plate; 14. Outlet; 15. Filter base; 16. Filter screen; 17. Three-way valve; 18. Rotary joint; 19. First stirring tube; 901, First set of bevel gears; 1902, Spiral conveyor blades; 20, Second stirring tube; 2001, Second set of bevel gears; 2002, Limiting ring; 21, Mounting bracket; 2101, Upper ring body; 2102, Lower ring body; 22, Stirring component; 2201, Stirring frame; 2202, Hollow frame; 2203, Silicone strip; 2204, Spray nozzle; 23, Support ring; 24, Cleaning frame; 25, Drive motor; 2501, Main bevel gear. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] Please see Figures 1 to 5This utility model provides a technical solution: an industrial wastewater denitrification treatment device, including a platform 1, a primary filter module installed on one side of the top of the platform 1, and an ion exchange module installed on the other side of the top of the platform 1. A treatment cylinder 8 is installed at the center of the top of the platform 1, and a top cover 7 is provided on the top of the treatment cylinder 8. A mounting frame 21 is provided at the center of the top of the top cover 7, and a stirring assembly 9 is installed on the mounting frame 21. Magnesium salt inlet 11 and phosphate inlet 12 are respectively opened at both ends of the top of the top cover 7. A liquid pump is installed at the bottom of the primary filter module near the treatment cylinder 8. 6. The output end of the infusion pump 6 is connected to the treatment cylinder 8 through a conduit. The bottom of the treatment cylinder 8 is provided with a discharge port 14. The primary filter box 2 can perform preliminary filtration of solid impurities and some pollutants in the wastewater, providing good conditions for subsequent reactions. The pre-treated wastewater enters the treatment cylinder 8 and is fully mixed with the reagent to generate struvite precipitate. The treated wastewater is introduced into the ion exchange box 13 and further removed by the ion exchange resin plate 1301 to make the denitrification treatment more thorough. While achieving denitrification and phosphorus removal by generating struvite, the recycling of resources is also realized.

[0025] For example, the primary filtration module includes a primary filter box 2 and a filter plate 3 and an activated carbon filter screen 4 disposed inside the primary filter box 2. The top of the primary filter box 2 has an inlet 5, and the filter plate 3 and activated carbon filter screen 4 are sequentially inserted into the interior of the primary filter box 2 from top to bottom. Sealing rings are provided at the insertion points of the filter plate 3 and activated carbon filter screen 4 into the primary filter box 2. The filter plate 3, with its porous structure, can effectively intercept large particulate impurities in industrial wastewater, such as sand, fibers, and suspended solids. The activated carbon in the activated carbon filter screen 4 has a rich porous structure and a large specific surface area, which can effectively adsorb pigments, odor substances, some small molecule organic matter, and some dissolved pollutants in the wastewater. Through the adsorption effect of the activated carbon filter screen 4, interfering substances in the wastewater that affect struvite formation can be removed, creating more favorable water quality conditions for subsequent treatment and helping to improve the purity and efficiency of the struvite formation reaction.

[0026] Exemplarily, the stirring assembly 9 includes a first stirring tube 19, a second stirring tube 20 and a stirring member 22. The second stirring tube 20 penetrates through the interior of the first stirring tube 19, and a spiral conveying blade 1902 is arranged on the outer side of the first stirring tube 19. A first auxiliary bevel gear 1901 is installed at the top of the first stirring tube 19, and a second auxiliary bevel gear 2001 is arranged at the top of the second stirring tube 20. Stirring members 22 are arranged on both sides of the second stirring tube 20 below the first stirring tube 19. A liquid inlet pipe 10 is connected to the top of the second stirring tube 20 through a rotary joint 18. The spiral conveying blade 1902 on the outer side of the first stirring tube 19 can drive the wastewater to circulate up and down in the treatment cylinder 8, just like forming a water flow circulation system in the vertical direction, which can quickly mix the liquid in the upper and lower layers and break the stratification phenomenon of the liquid in the treatment cylinder 8. The stirring members 22 on both sides of the second stirring tube 20 stir the wastewater in the horizontal direction, causing the wastewater to flow horizontally, which intersects with the vertical flow formed by the first stirring tube 19 to form a three-dimensional stirring effect. This multi-dimensional stirring method enables the ammonium ions, added magnesium salts and phosphates in the wastewater to fully contact within a short time, greatly improving the mixing uniformity between the reactants and providing good reaction conditions for the formation of struvite.

[0027] Please refer to Figure 3 , a support ring 23 is installed inside the discharge port 14, and the second stirring tube 20 penetrates through the support ring 23. The inner diameter of the support ring 23 matches the outer diameter of the second stirring tube 20. Limiting rings 2002 are arranged on the second stirring tube 20 at both the upper and lower ends of the support ring 23. The bottom of the second stirring tube 20 is connected to a cleaning frame 24 with a "U" shape, and the outer wall of the cleaning frame 24 is fitted with the inner wall of the discharge port 14. When the second stirring tube 20 rotates, the cleaning frame 24 rotates synchronously, which can timely scrape off the struvite and other precipitates attached to the inner wall of the discharge port 14 and the filter screen 16, preventing the accumulation of precipitates from blocking the discharge port 14 and the filter screen 16.

[0028] Please refer to Figure 5 , the mounting frame 21 is designed in a "C" shape, and upper ring bodies 2101 and lower ring bodies 2102 are respectively welded to the two horizontal ends of the mounting frame 21. The second stirring tube 20 penetrates through the upper ring body 2101, and the outer diameter of the second stirring tube 20 matches the inner diameter of the upper ring body 2101. The first stirring tube 19 penetrates through the lower ring body 2102, and the outer diameter of the first stirring tube 19 matches the inner diameter of the lower ring body 2102. The upper ring body 2101 and the lower ring body 2102 welded to the two horizontal ends of the mounting frame 21 can respectively support the second stirring tube 20 and the first stirring tube 19. During the operation of the stirring assembly 9, the upper ring body 2101 and the lower ring body 2102 can effectively disperse the acting force generated when the stirring tube rotates, avoiding the shaking or deviation of the stirring tube due to uneven force.

[0029] Please refer toFigure 5 A drive motor 25 is fixed to the outside of the mounting bracket 21, and a main bevel gear 2501 is installed on the inside of the mounting bracket 21. The output end of the drive motor 25 is connected to the main bevel gear 2501. A first auxiliary bevel gear 1901 that meshes with the main bevel gear 2501 is installed on the first stirring tube 19 above the lower ring body 2102, and a second auxiliary bevel gear 2001 that meshes with the main bevel gear 2501 is installed on the second stirring tube 20 below the upper ring body 2101. The main bevel gear 2501 meshes with both the first auxiliary bevel gear 1901 and the second auxiliary bevel gear 2001, which allows the first stirring tube 19 and the second stirring tube 20 to rotate at different speeds and directions, thereby achieving differentiated stirring.

[0030] Please see Figure 2 and Figure 3 The stirring component 22 includes a stirring frame 2201, two hollow frames 2202 connected to the second stirring tube 20, and a silicone strip 2203. The stirring frame 2201 is connected to the side of the hollow frame 2202 near the second stirring tube 20, and spray nozzles 2204 are evenly distributed on the side of the hollow frame 2202 near the second stirring tube 20. The silicone strip 2203 is inserted into the outside of the hollow frame 2202 and is in contact with the inner wall of the processing cylinder 8. The hollow frame 2202 is connected to the second stirring tube 20, and the external reaction agent enters the second stirring tube 20 through the liquid inlet pipe 10. After the two stirring tubes 20, the agent can be dispersed into the wastewater through the spray nozzles 2204 evenly opened on the hollow frame 2202. During the rotation of the stirring element 22, the spray nozzles 2204 can spray the agent in the form of fine droplets, increasing the contact area between the agent and the wastewater, avoiding the problem of excessive local concentration or uneven mixing caused by concentrated agent addition. At the same time, as the stirring element 22 stirs, the silicone strip 2203 is closely attached to the inner wall of the treatment cylinder 8, continuously scraping the inner wall of the treatment cylinder 8, cleaning off some bird droppings crystals or other sediments that are easily attached to the inner wall of the treatment cylinder 8.

[0031] Please see Figure 1 A filter seat 15 is connected to one side of the discharge port 14, and a filter screen 16 is inserted into the side of the filter seat 15 near the treatment cylinder 8. The ion exchange module includes an ion exchange box 13 and an ion exchange resin plate 1301 inserted into the ion exchange box 13. A three-way valve 17 is connected to the side of the filter seat 15 near the ion exchange box 13 through a conduit, and the top of the three-way valve 17 is connected to the ion exchange box 13 through a conduit. The ion exchange resin plate 1301 in the ion exchange module can effectively remove residual ammonium ions, phosphate ions and other nutrients in the wastewater through ion exchange, thereby achieving deep purification of the treated wastewater and improving the wastewater treatment effect.

[0032] Detailed Implementation: In use, the primary filter box 2 can perform preliminary filtration of solid impurities and some pollutants in the wastewater. The pre-treated wastewater enters the treatment cylinder 8. Magnesium salt and phosphate are added to the wastewater through the magnesium salt inlet 11 and phosphate inlet 12. The drive motor 25 starts, driving the main bevel gear 2501 to rotate. The main bevel gear 2501 meshes with the first secondary bevel gear 1901 and the second secondary bevel gear 2001, respectively, thereby causing the first stirring tube 19 and the second stirring tube 20 to rotate in opposite directions at different speeds. The stirring elements 22 on the first stirring tube 19 and the second stirring tube 20 rotate accordingly, stirring the industrial wastewater in the treatment cylinder 8, so that the wastewater and the added reagents are fully mixed and reacted, promoting the conversion of pollutants such as nitrogen and phosphorus in the wastewater into... The process involves the sedimentation of struvite. External reaction agents, such as sodium hydroxide solution for pH adjustment, are delivered from the inlet pipe 10 to the second stirring pipe 20 and sprayed out through the spray nozzle 2204 on the hollow frame 2202. This ensures the agents fully contact and react with the wastewater, promoting struvite formation. The settled wastewater and struvite mixture enters the filter seat 15 through the outlet 14. After filtration by the filter screen 16, the struvite is trapped on the screen and discharged from the bottom of the outlet 14. The filtered wastewater then enters the ion exchange tank 13 through the three-way valve 17. The ion exchange resin plate 1301 effectively removes residual ammonium ions, phosphate ions, and other nutrients from the wastewater through ion exchange, achieving deep purification of the treated wastewater.

[0033] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An industrial wastewater denitrification treatment device, comprising a platform (1), characterized in that: On one side of the top of the carrier table (1), a primary filtration module is installed, and on the other side of the top of the carrier table (1), an ion exchange module is installed. At the central position of the top of the carrier table (1), a treatment cylinder (8) is installed, and a top cover (7) is arranged at the top of the treatment cylinder (8). At the central position of the top of the top cover (7), a mounting frame (21) is arranged, and a stirring component (9) is installed on the mounting frame (21). At both ends of the top of the top cover (7), a magnesium salt feeding port (11) and a phosphate feeding port (12) are respectively opened. At the bottom of the side of the primary filtration module close to the treatment cylinder (8), an infusion pump (6) is installed, and the output end of the infusion pump (6) is communicated with the treatment cylinder (8) through a conduit. At the bottom of the treatment cylinder (8), a discharge port (14) is arranged.

2. The industrial wastewater denitrification treatment device according to claim 1, characterized in that: The primary filtration module includes a primary filtration box (2) and a filter plate (3) and an activated carbon filter screen (4) arranged inside the primary filtration box (2). At the top of the primary filtration box (2), a water inlet (5) is opened, and the filter plate (3) and the activated carbon filter screen (4) are sequentially inserted into the primary filtration box (2) from top to bottom. Sealing rubber rings are arranged at the insertion joints of the filter plate (3) and the activated carbon filter screen (4) and the primary filtration box (2).

3. The industrial wastewater denitrification treatment device according to claim 1, characterized in that: The stirring component (9) includes a first stirring pipe (19), a second stirring pipe (20) and a stirring piece (22). The second stirring pipe (20) penetrates through the inside of the first stirring pipe (19), and a spiral conveying blade (1902) is arranged on the outer side of the first stirring pipe (19). At the top of the first stirring pipe (19), a first sub-bevel gear (1901) is installed. At the top of the second stirring pipe (20), a second sub-bevel gear (2001) is arranged, and stirring pieces (22) are arranged on both sides of the second stirring pipe (20) below the first stirring pipe (19). The top of the second stirring pipe (20) is connected with a liquid inlet pipe (10) through a rotary joint (18).

4. The industrial wastewater denitrification treatment device according to claim 3, characterized in that: A support ring (23) is installed inside the discharge port (14), and the second stirring pipe (20) penetrates through the support ring (23). The inner diameter of the support ring (23) is matched with the outer diameter of the second stirring pipe (20), and limiting rings (2002) are arranged on the second stirring pipe (20) at the upper and lower ends of the support ring (23). The bottom of the second stirring pipe (20) is connected with a "U"-shaped cleaning frame (24), and the outer wall of the cleaning frame (24) is fitted with the inner wall of the discharge port (14).

5. The industrial wastewater denitrification treatment device according to claim 3, characterized in that: The mounting frame (21) is designed in a "C" shape, and an upper ring body (2101) and a lower ring body (2102) are respectively welded at the two horizontal ends of the mounting frame (21). The second stirring pipe (20) penetrates through the upper ring body (2101), and the outer diameter of the second stirring pipe (20) is matched with the inner diameter of the upper ring body (2101). The first stirring pipe (19) penetrates through the lower ring body (2102), and the outer diameter of the first stirring pipe (19) is matched with the inner diameter of the lower ring body (2102).

6. The industrial wastewater denitrification treatment device according to claim 5, characterized in that: A drive motor (25) is fixed on the outside of the mounting bracket (21), and a main bevel gear (2501) is installed on the inside of the mounting bracket (21). The output end of the drive motor (25) is connected to the main bevel gear (2501). A first auxiliary bevel gear (1901) that meshes with the main bevel gear (2501) is installed on the first stirring tube (19) above the lower ring body (2102), and a second auxiliary bevel gear (2001) that meshes with the main bevel gear (2501) is installed on the second stirring tube (20) below the upper ring body (2101).

7. The industrial wastewater denitrification treatment device according to claim 3, characterized in that: The stirring component (22) includes a stirring rack (2201), two hollow frames (2202) connected to the second stirring tube (20), and a silicone strip (2203). The hollow frame (2202) is connected to the stirring rack (2201) on the side near the second stirring tube (20), and the hollow frame (2202) is evenly provided with spray nozzles (2204) on the side near the second stirring tube (20). The silicone strip (2203) is inserted into the outside of the hollow frame (2202), and the silicone strip (2203) is in contact with the inner wall of the processing cylinder (8).

8. The industrial wastewater denitrification treatment device according to claim 1, characterized in that: The outlet (14) is connected to a filter seat (15) on one side, and a filter screen (16) is inserted into the filter seat (15) on the side near the processing cylinder (8). The ion exchange module includes an ion exchange box (13) and an ion exchange resin plate (1301) inserted into the ion exchange box (13). The filter seat (15) is connected to a three-way valve (17) via a conduit on the side near the ion exchange box (13), and the top of the three-way valve (17) is connected to the ion exchange box (13) via a conduit.

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