Tap water dechlorination system
The problem of excessive residual chlorine in tap water is solved by combining a multi-media filter, an activated carbon filter, and a residual chlorine dissolving device with a calcium sulfite reaction, thereby protecting the reverse osmosis membrane, simplifying the control system, and reducing costs.
Patent Information
- Application Number
- CN202422854061.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-11-22
AI Technical Summary
Excessive residual chlorine in tap water will damage the reverse osmosis membrane, and the existing control system is complex and costly.
Use multi-media filters, activated carbon filters and residual chlorine dissolving devices, use calcium sulfite particles to react with residual chlorine, and combine with resin softeners to pre-treat tap water and reduce residual chlorine concentration.
Effectively remove residual chlorine in tap water, protect reverse osmosis membrane, simplify control system, and reduce construction and operation costs.
Smart Images
Figure CN223445372U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of water treatment, in particular to a tap water dechlorination system. BACKGROUND
[0002] Tap water plants generally use chlorine disinfection. In actual use, the residual chlorine of tap water often exceeds the standard after the tap water is discharged from the plant. Residual chlorine refers to the part of chlorine that remains in the water after the water is disinfected by chlorine for a certain period of time, in addition to the part of chlorine that is consumed by bacteria, microorganisms, organic matter, inorganic matter and the like in the water. The residual chlorine in the water can ensure the continuous bactericidal capacity, but if the residual chlorine exceeds the standard, it will damage the reverse osmosis membrane in the subsequent reverse osmosis system. CONTENT
[0003] The purpose of the present application is to provide a tap water dechlorination system to sufficiently remove the residual chlorine in tap water and protect the reverse osmosis membrane in the subsequent reverse osmosis system. The specific technical solution is as follows:
[0004] The present application provides a tap water dechlorination system, which comprises a tap water source, a flow pipeline, a multi-medium filter, an activated carbon filter, a residual chlorine dissolving device and a resin softener which are sequentially connected in communication with the tap water source through the flow pipeline. The multi-medium filter is used to filter solid impurities in the tap water source, and the activated carbon filter and the residual chlorine dissolving device are used to remove residual chlorine in the tap water source. The residual chlorine dissolving device has calcium sulfite particles, which are dissolved in the tap water when the tap water flows through the residual chlorine dissolving device and then flows into the resin softener.
[0005] In some embodiments, the tap water dechlorination system further comprises an override pipe, one end of the override pipe being in communication with the tap water source and the other end being in communication with the outlet of the flow pipeline.
[0006] In some embodiments, the tap water dechlorination system further comprises a first pressure gauge, which is arranged between the tap water source and the water inlet of the override pipe.
[0007] In some embodiments, the override pipe comprises a first standby section, and the first standby section is provided with a first standby valve; the flow pipeline comprises a first flow section, and the residual chlorine dissolving device is arranged in the first flow section; the first flow section is connected in parallel with the first standby section; the first flow section is provided with a first control valve, and the first control valve is arranged between the outlet of the residual chlorine dissolving device and the outlet of the first flow section.
[0008] In some embodiments, a flow detection device is further arranged on the first flow section, and the flow detection device is arranged between the first control valve and the outlet of the first flow section.
[0009] In some embodiments, the flow detection device is a transparent tube.
[0010] In some embodiments, the bypass pipe further comprises a second bypass section, a third bypass section and a fourth bypass section, the flow pipe comprises a second flow section, a third flow section and a fourth flow section; the second bypass section is in parallel with the second flow section, the third bypass section is in parallel with the third flow section, and the fourth bypass section is in parallel with the fourth flow section; the multi-medium filter is arranged in the second flow section, the activated carbon filter is arranged in the third flow section, and the resin softener is arranged in the fourth flow section; the second bypass section is provided with a second bypass valve; the third bypass section is provided with a third bypass valve; and the fourth bypass section is provided with a fourth bypass valve.
[0011] In some embodiments, a first sampling port is arranged between the water outlet of the first flow section and the water inlet of the fourth flow section; a second sampling port is arranged between the water outlet of the multi-medium filter and the water outlet of the second flow section; a third sampling port is arranged between the water outlet of the activated carbon filter and the water outlet of the third flow section; and a fourth sampling port is arranged between the resin softener and the water outlet of the fourth flow section.
[0012] In some embodiments, the tap water chlorine removal system further comprises a salt tank, which is in communication with the resin softener.
[0013] In some embodiments, the residual chlorine dissolving device comprises a container and a filter screen, the filter screen is arranged in the container and located at the upper part of the calcium sulfite particles.
[0014] In the embodiments of the present application, the water in the tap water source flows into the multi-medium filter through the flow pipe, the multi-medium filter can filter out the larger solid impurities in the tap water, and then the tap water flows into the activated carbon filter through the flow pipe, the activated carbon filter can preliminarily remove the residual chlorine in the natural water, the tap water continues to flow into the residual chlorine dissolving device through the flow pipe, the calcium sulfite in the residual chlorine dissolving device can react with the residual chlorine, further removing the residual chlorine in the tap water, playing a role of fully removing the residual chlorine in the tap water, and the residual chlorine in the tap water flowing into the subsequent reverse osmosis membrane is less, so the reverse osmosis membrane can be better protected. The tap water after full chlorine removal flows into the resin softener, and the resin softener can remove the calcium ions in the tap water, thereby realizing further purification of the tap water.
[0015] Of course, implementing any product of the present application does not necessarily need to achieve all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some of the embodiments of the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.
[0017] Figure 1 The tap water chlorine removal system provided by the embodiments of the present application.
[0018] Reference signs:
[0019] Tap water source 10; flow pipeline 20; first flow section 21; first control valve 211; flow detection device 212; second flow section 22; third flow section 23; fourth flow section 24; first sampling port 25; second sampling port 26; third sampling port 27; fourth sampling port 28; first common section 291; second common section 292; third common section 293; multi-medium filter 30; first wastewater discharge pipeline 31; activated carbon filter 40; second wastewater discharge pipeline 41; residual chlorine dissolving device 50; calcium sulfite particles 51; container 52; filter screen 53; resin softener 60; third wastewater discharge pipeline 61; bypass pipe 70; first standby section 71; first standby valve 711; second standby section 72; second standby valve 721; third standby section 73; third standby valve 731; fourth standby section 74; fourth standby valve 741; first pressure gauge 81; second pressure gauge 82; salt tank 91; reverse osmosis membrane 92. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art based on the present application belong to the scope of protection of the present application.
[0021] In the prior art, tap water plants generally use chlorine disinfection. The residual chlorine requirement of tap water out of the plant is ≥0.3 mg / L, and the residual chlorine requirement of the terminal water supply is ≥0.05 mg / L. In actual use, the phenomenon of excessive residual chlorine often occurs. The residual chlorine is a short name of the residual chlorine, which is a water quality parameter of chlorine disinfection. After water is disinfected by chlorine for a certain period of time, in addition to a part of chlorine amount consumed by the action of bacteria, microorganisms, organic matter, inorganic matter and the like in the water, there is still a part of chlorine amount, which is called residual chlorine.
[0022] The residual chlorine in water can ensure the continuous sterilization capacity, which mainly exists in the form of free chlorine and combined chlorine. The residual chlorine has strong oxidizing property and can affect the reverse osmosis membrane in the process of producing pure water, so the water inlet requirement of the reverse osmosis membrane is generally ≤0.1 mg / L. One technical solution can use a metering pump to inject a reducing agent into the pipeline, so as to reduce the residual chlorine into chloride ions, but the control system of this solution is relatively complex.
[0023] In order to more fully remove the residual chlorine in tap water, as shown in the prior art, the embodiments of the present application provide a tap water chlorine removal system. Figure 1 As shown in the prior art, the embodiments of the present application provide a tap water chlorine removal system, which comprises a tap water source 10, a flow pipeline 20, a multi-medium filter 30, an activated carbon filter 40, a residual chlorine dissolving device 50 and a resin softener 60 which are sequentially communicated with the tap water source 10 through the flow pipeline 20. The multi-medium filter 30 is used to filter the solid impurities in the tap water source 10, and the activated carbon filter 40 and the residual chlorine dissolving device 50 are used to remove the residual chlorine in the tap water source 10. The residual chlorine dissolving device 50 has calcium sulfite particles 51, which are dissolved in the tap water when the tap water flows through the residual chlorine dissolving device 50, and then flow into the resin softener 60.
[0024] In the embodiments of the present application, the water in the tap water source 10 flows into the multi-medium filter 30 through the flow pipeline 20, and the multi-medium filter 30 can filter out the larger solid impurities in the tap water, and then the tap water flows into the activated carbon filter 40 through the flow pipeline 20. The activated carbon filter 40 can preliminarily remove the residual chlorine in the tap water, and then the tap water flows into the residual chlorine dissolving device 50 through the flow pipeline 20. The calcium sulfite in the residual chlorine dissolving device 50 can react with the residual chlorine to further remove the residual chlorine in the tap water, so as to fully remove the residual chlorine in the tap water. The residual chlorine in the tap water flowing into the subsequent reverse osmosis membrane 92 is less, so the reverse osmosis membrane 92 can be better protected, thereby ensuring the desalination rate and service life of the reverse osmosis membrane. The tap water after the residual chlorine is fully removed flows into the resin softener 60, and the resin softener 60 can remove the calcium ions in the tap water, thereby further purifying the tap water.
[0025] In the purification process of the tap water, the pretreatment before entering the reverse osmosis membrane has a high requirement for removing the residual chlorine. The residual chlorine higher than 0.1 mg / L can have a great influence on the desalination rate and service life of the reverse osmosis membrane. The process unit of the pure water pretreatment is generally: mechanical filtration-activated carbon filtration-resin softening, and then entering the reverse osmosis membrane. The main function of the activated carbon filtration is to remove the residual chlorine. In the actual process, due to the difference of the tap water sources in different regions of China, the water quality has a great difference, so the residual chlorine often exceeds the standard. Therefore, the design of the pretreatment becomes the key of the pure water system.
[0026] Specifically, the chemical formula of the calcium sulfite ball (i.e., calcium sulfite particle) for removing residual chlorine in tap water is as follows:
[0027] S1: Start the reaction by dissolving a small amount of calcium sulfite in water.
[0028] CaSO3+H2O→Ca 2+ +SO3 2-
[0029] S2: The dissolved sulfite ion reacts with residual chlorine in water.
[0030] SO3 2 -+ClO - →Cl - +SO4 2-
[0031] S3: Excess sulfite ions can also react with oxygen in the air instantaneously.
[0032] 2SO3 2- +O2→2SO4 2-
[0033] It should be noted that the tap water chlorine removal system provided in the embodiments of the present application can also be applied in the medical field. The calcium sulfite removes residual chlorine in tap water, which is more safe and environmentally friendly. Through the above reactions, the residual chlorine in the reverse osmosis feed water can be guaranteed to be ≤0.1 mg / L.
[0034] Specifically, as shown in Figure 1 , the tap water chlorine removal system further includes a first wastewater discharge pipeline 31, a second wastewater discharge pipeline 41, and a third wastewater discharge pipeline 61. The first wastewater discharge pipeline 31 is used to discharge wastewater in the multi-medium filter 30, the second wastewater discharge pipeline 41 is used to discharge wastewater in the activated carbon filter 40, and the third wastewater discharge pipeline 61 is used to discharge wastewater in the resin softener 60.
[0035] In some embodiments of the present application, the tap water chlorine removal system further includes an override pipe 70. One end of the override pipe 70 is in communication with the tap water source 10, and the other end is in communication with the outlet of the flow pipeline 20.
[0036] In the embodiments of the present application, when the tap water in the tap water source 10 is overloaded, the tap water in the tap water source 10 is allowed to flow through the override pipe 70, which can relieve the pressure in the system.
[0037] If the system has a bypass pipe 70, only a bypass needs to be added, that is, a first flow section is added, and a residual chlorine dissolving device is installed in the first flow section. This simplifies the structure, reduces costs, and can significantly reduce on-site construction. It does not require electrical control, is low in cost, operates stably, and occupies a small space. This technology realizes the solution of excessive residual chlorine in tap water by adding chemicals through the bypass system.
[0038] In some embodiments of the present application, the tap water dechlorination system further includes a first pressure gauge 81 , which is disposed between the tap water source 10 and the water inlet of the override pipe 70 .
[0039] In the embodiment of the present application, the setting of the first press can timely detect the pressure at the tap water source 10, and when the pressure is too high, it can timely allow the tap water to flow into the bypass pipe 70.
[0040] In some embodiments of the present application, the override pipe 70 includes a first spare section 71, and the first spare section 71 is provided with a first spare valve 711; the circulation pipeline 20 includes a first circulation section 21, and the residual chlorine dissolution device 50 is provided in the first circulation section 21; the first circulation section 21 is connected in parallel with the first spare section 71; the first circulation section 21 is provided with a first control valve 211, and the first control valve 211 is provided between the outlet of the residual chlorine dissolution device 50 and the outlet of the first circulation section 21.
[0041] In the embodiment of this application, Figure 1 As shown, since the first flow section 21 and the first standby section 71 are connected in parallel, when the residual chlorine dissolving device 50 located in the first flow section 21 fails, the first standby valve 711 can be opened, allowing tap water to flow through the first standby section 71 to the next device. The provision of the first standby section 71 and the first standby valve 711 facilitates the installation and maintenance of the residual chlorine dissolving device 50.
[0042] It should be noted that the first backup valve 711 is a shut-off valve used to control the on / off of the first backup section 71. When the residual chlorine dissolving device 50 operates normally, the first backup valve 711 cuts off the circulation of the first backup section 71, so that tap water can only flow through the first circulation section 21.
[0043] In some embodiments of the present application, a flow detection device 212 is further provided on the first circulation section 21 , and the flow detection device 212 is provided between the first control valve 211 and the outlet of the first circulation section 21 .
[0044] In the embodiment of the present application, the flow detection device 212 can timely detect the flow of the first circulation section 21. According to actual needs, when it is detected that the flow of the first circulation section 21 is too large or too small, the flow of the first circulation section 21 is adjusted through the first control valve 211.
[0045] The application utilizes bypass of the pipe (i.e. the first flow section) to add calcium sulfite, controls the amount of the additive (i.e. the amount of calcium sulfite) by adjusting the first control valve, and the calcium sulfite is slightly dissolved in water when the water passes through, and the residual chlorine is decomposed into chloride ions by the reduction of the calcium sulfite. The amount of the calcium sulfite added is controlled by the water flow controlled by the first control valve according to the solubility of the calcium sulfite, so that the amount of the additive is reduced. The first control valve after the residual chlorine dissolving device is adjusted to meet the chlorine removal requirements of different water flow.
[0046] In some embodiments of the application, the flow detection device 212 is a transparent pipe.
[0047] In the embodiments of the application, the flow detection device 212 is a transparent pipe, which can save costs and can more intuitively see the flow of tap water.
[0048] In some other embodiments, the flow detection device 212 can also be a flow meter.
[0049] In some embodiments of the application, the bypass pipe 70 further comprises a second standby section 72, a third standby section 73 and a fourth standby section 74, and the flow pipe 20 comprises a second flow section 22, a third flow section 23 and a fourth flow section 24; the second standby section 72 is connected in parallel with the second flow section 22, the third standby section 73 is connected in parallel with the third flow section 23, and the fourth standby section 74 is connected in parallel with the fourth flow section 24; the multi-medium filter 30 is arranged in the second flow section 22, the activated carbon filter 40 is arranged in the third flow section 23, and the resin softener 60 is arranged in the fourth flow section 24; the second standby section 72 is provided with a second standby valve 721; the third standby section 73 is provided with a third standby valve 731; and the fourth standby section 74 is provided with a fourth standby valve 741.
[0050] In the embodiments of the application, the multi-medium filter 30 is arranged in the second standby section 72, and the second standby section 72 is connected in parallel with the second flow section 22, so that when the multi-medium filter 30 fails or needs to be cleaned, the second standby valve 721 is opened to make the tap water flow through the second standby section 72 to the next process. Similarly, the activated carbon filter 40 is arranged in the third standby section 73, and the third standby section 73 is connected in parallel with the third flow section 23, so that when the activated carbon filter 40 fails or needs to be cleaned, the third standby valve 731 is opened to make the tap water flow through the third standby section 73 to the next process; and the resin softener 60 is arranged in the fourth standby section 74, and the fourth standby section 74 is connected in parallel with the fourth flow section 24, so that when the resin softener 60 fails or needs to be cleaned, the fourth standby valve 741 is opened to make the tap water flow through the fourth standby section 74 to the next process.
[0051] Specifically, the circulation pipe 20 includes a first common section 291, a second common section 292, and a third common section 293. The water inlet end of the first common section 291 is connected to the water outlet end of the second spare section 72 of the bypass pipe 70, and the water outlet end of the first common section 291 is connected to the water inlet end of the third spare section 73 of the bypass pipe 70; the water inlet end of the second common section 292 is connected to the water outlet end of the third spare section 73 of the bypass pipe 70, and the water outlet end of the first common section 291 is connected to the water inlet end of the first spare section 71 of the bypass pipe 70; the water inlet end of the third common section 293 is connected to the water outlet end of the first spare section 71 of the bypass pipe 70, and the water outlet end of the third common section 293 is connected to the water inlet end of the fourth spare section 74 of the bypass pipe 70. Through the above arrangement, when one of the devices in the system is damaged, tap water can be promptly circulated to the bypass pipe 70, preventing tap water from being retained in the pipeline.
[0052] More specifically, a second pressure gauge 82 is provided on the first common section 291 .
[0053] The second backup valve, the third backup valve and the fourth backup valve may be shut-off valves or butterfly valves.
[0054] When the water flow is large, the first standby valve 711 and the first control valve 211 are opened at the same time, so that the water flows through the second common section 292 and is divided into two paths, respectively flowing through the first standby section 71 of the transcending pipe 70 and the first flow section 21 where the residual chlorine dissolving device is located. The two paths of tap water are mixed at the third common section 293, and the tap water treated by the residual chlorine dissolving device becomes dissolved water of calcium sulfite. The dissolved water of calcium sulfite is mixed with the tap water flowing out of the first standby section 71 to remove the residual chlorine in the water. The above arrangement can relieve the working pressure of the residual chlorine dissolving device. When the water flow rate is small and the activated carbon filter 40 has fully removed the residual chlorine, you can choose to close the first control valve 211 and open the first standby valve 711 so that the water only flows through the first standby section 71 of the bypass pipe 70 and does not flow through the first flow section 21 where the residual chlorine dissolving device is located; when the water flow rate is small and the activated carbon filter 40 has not fully removed the residual chlorine, close the first standby valve 711 and open the first control valve 211 so that the water only flows through the first flow section 21 where the residual chlorine dissolving device is located and does not flow through the first standby section 71 of the bypass pipe 70.
[0055] In some embodiments of the present application, a first sampling port 25 is provided between the water outlet of the first circulation section 21 and the water inlet of the fourth circulation section 24; a second sampling port 26 is provided between the water outlet of the multi-media filter 30 and the water outlet of the second circulation section 22; a third sampling port 27 is provided between the water outlet of the activated carbon filter 40 and the water outlet of the third circulation section 23; and a fourth sampling port 28 is provided between the resin softener 60 and the water outlet of the fourth circulation section 24.
[0056] In the embodiments of the present application, the first sampling port 25 is arranged to sample and detect the tap water that has passed through the residual chlorine dissolving device 50; the second sampling port 26 is arranged to sample and detect the tap water that has passed through the multi-medium filter 30; the third sampling port 27 is arranged to sample and detect the tap water that has passed through the activated carbon filter 40; and the fourth sampling port 28 is arranged to sample and detect the tap water that has passed through the resin softener 60, so that the water quality of the tap water in different processes can be better detected, and the water quality of the tap water can be better controlled.
[0057] In some embodiments of the present application, the tap water chlorine removal system further comprises a salt tank 91 that is in communication with the resin softener 60.
[0058] In the embodiments of the present application, the resin in the resin softener 60 is sodium ion type resin, and the calcium and magnesium ions in the tap water will exchange the sodium ions in the resin, so that the original sodium ions in the resin softener 60 will become calcium and magnesium ions, and the salt tank 91 can provide sodium chloride for the resin softener 60, so that the calcium and magnesium ions in the resin softener 60 can be removed and replaced by sodium ions.
[0059] In some embodiments of the present application, the residual chlorine dissolving device 50 comprises a container 52 and a filter screen 53, and the filter screen 53 is arranged in the container 52 and located at the upper portion of the calcium sulfite particles 51.
[0060] In the embodiments of the present application, the filter screen 53 is arranged at the upper portion of the calcium sulfite particles 51, which can limit the water level in the container 52 and prevent the solution in the residual chlorine dissolving device 50 from overflowing, and in addition, the filter screen 53 has a plurality of perforations, so that the excess sulfite ions in the residual chlorine dissolving device 50 can react with oxygen in the air.
[0061] Specifically, the container 52 can be a sealed plastic container.
[0062] The above merely provides the preferred embodiments of the present application, but is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A tap water dechlorination system, characterized in that: include: Tap water source (10), circulation pipeline (20); A multi-media filter (30), an activated carbon filter (40), a residual chlorine dissolving device (50), and a resin softener (60) connected in sequence to the tap water source (10) through the circulation pipe (20); The multi-media filter (30) is used to filter solid impurities in the tap water source (10), and the activated carbon filter (40) and the residual chlorine dissolving device (50) are used to remove residual chlorine in the tap water source (10); the residual chlorine dissolving device (50) has calcium sulfite particles (51), and when the tap water passes through the residual chlorine dissolving device (50), the calcium sulfite particles (51) dissolve in the tap water and flow into the resin softener (60).
2. The tap water dechlorination system according to claim 1, characterized in that: The tap water dechlorination system further comprises a bypass pipe (70), one end of which is connected to the tap water source (10), and the other end of which is connected to the outlet of the circulation pipe (20).
3. The tap water dechlorination system according to claim 2, characterized in that: The tap water dechlorination system further comprises a first pressure gauge (81), which is arranged between the tap water source (10) and the water inlet of the bypass pipe (70).
4. The tap water dechlorination system according to claim 2, characterized in that: The overrunning pipe (70) comprises a first standby section (71), wherein the first standby section (71) is provided with a first standby valve (711); The circulation pipeline (20) includes a first circulation section (21), and the residual chlorine dissolving device (50) is provided in the first circulation section (21); the first circulation section (21) is connected in parallel with the first standby section (71); the first circulation section (21) is provided with a first control valve (211), and the first control valve (211) is provided between the outlet of the residual chlorine dissolving device (50) and the outlet of the first circulation section (21).
5. The tap water dechlorination system according to claim 4, characterized in that: The first circulation section (21) is further provided with a flow detection device (212), and the flow detection device (212) is arranged between the first control valve (211) and the outlet of the first circulation section (21).
6. The tap water dechlorination system according to claim 5, characterized in that: The flow detection device (212) is a transparent tube.
7. The tap water dechlorination system according to claim 4, characterized in that: The overrunning pipe (70) further includes a second spare section (72), a third spare section (73), and a fourth spare section (74); and the circulation pipeline (20) includes a second circulation section (22), a third circulation section (23), and a fourth circulation section (24); The second standby section (72) is connected in parallel with the second circulation section (22), the third standby section (73) is connected in parallel with the third circulation section (23), and the fourth standby section (74) is connected in parallel with the fourth circulation section (24); The multi-media filter (30) is provided in the second flow section (22), the activated carbon filter (40) is provided in the third flow section (23), and the resin softener (60) is provided in the fourth flow section (24); The second standby section (72) is provided with a second standby valve (721); the third standby section (73) is provided with a third standby valve (731); and the fourth standby section (74) is provided with a fourth standby valve (741).
8. The tap water dechlorination system according to claim 7, characterized in that: A first sampling port (25) is provided between the water outlet of the first circulation section (21) and the water inlet of the fourth circulation section (24); a second sampling port (26) is provided between the water outlet of the multi-media filter (30) and the water outlet of the second circulation section (22); a third sampling port (27) is provided between the water outlet of the activated carbon filter (40) and the water outlet of the third circulation section (23); and a fourth sampling port (28) is provided between the resin softener (60) and the water outlet of the fourth circulation section (24).
9. The tap water dechlorination system according to any one of claims 1 to 8, characterized in that: The tap water dechlorination system further comprises a salt tank (91), and the salt tank (91) is communicated with the resin softener (60).
10. The tap water dechlorination system according to any one of claims 1 to 8, characterized in that: The residual chlorine dissolving device (50) comprises a container (52) and a filter (53), wherein the filter (53) is arranged in the container (52) and located above the calcium sulfite particles (51).