Scale inhibitor circulating descaling method and soft water filtering system

Abstract

The invention relates to the field of water treatment, in particular to a scale inhibitor circulating descaling method which specifically comprises the following steps: when an RO (reverse osmosis) membrane needs to be descaled, adding a scale inhibitor at a water inlet of a reverse osmosis main body; enabling seepage water produced after the scale inhibitor is added to flow back to a water inlet of the reverse osmosis main body; after circulation is conducted for a set time, adding of the scale inhibitor is stopped, and circulation of the medium is kept; and after the medium circulates for a set time, the seepage water recovers to be normally discharged, so that the discharged seepage water is not easy to contain a scale inhibitor, and the discharged seepage water can be directly used or stored.

Description

Technical Field

[0001] The present application relates to the field of water treatment, and in particular to an antiscalant circulation descaling method and a soft water filtration system. Background Art

[0002] There are certain amounts of calcium and magnesium compounds as well as bacteria and viruses in soft water. In order to obtain relatively pure water, a reverse osmosis device is generally used to filter the soft water. The resulting permeated water is used or stored, and the concentrated water is used for the next step of treatment.

[0003] During long-term use, the calcium and magnesium compounds in the soft water in the RO membrane of the existing reverse osmosis device will scale at the RO membrane, affecting the water output rate. For this reason, scale inhibitors are generally added to the reverse osmosis device to prevent the RO membrane from scaling. For example, a desalted water production system and process using a double membrane method is disclosed in Publication No. CN116835803A.

[0004] With respect to the above-mentioned related technologies, some scale inhibitors are inevitably present in the permeate water produced by the reverse osmosis device, which results in the permeate water needing to be further treated before it can be used. Summary of the invention

[0005] In order to eliminate the need for further treatment of the produced permeate water to remove the antiscalant, the present application provides an antiscalant circulation descaling method and a soft water filtration system.

[0006] In a first aspect, the present application provides an antiscalant circulation and descaling method that adopts the following technical solution.

[0007] A scale inhibitor circulation descaling method specifically comprises the following steps.

[0008] Step 1: When the RO membrane of the reverse osmosis body needs to be descaled, add a scale inhibitor at the water inlet of the reverse osmosis body; Step 2: Return the permeate produced after adding the scale inhibitor to the water inlet of the reverse osmosis body; Step 3: After the circulation has lasted for a set period of time, stop adding the scale inhibitor and keep the medium circulating; Step 4: After the medium circulates for a predetermined period of time, the permeated water returns to normal discharge.

[0009] By adopting the above technical solution, when the internal RO membrane is blocked to a certain extent due to the predetermined filtering time of the reverse osmosis body, the scale inhibitor is added and the flow direction of the permeated water is changed, so that the permeated water with a certain amount of scale inhibitor flows back into the reverse osmosis body. On the one hand, the utilization rate of the scale inhibitor is improved and the amount of the scale inhibitor is reduced. On the other hand, the permeated water with the scale inhibitor is not easy to be discharged directly, and there is no need to reprocess the permeated water.

[0010] In a second aspect, the present application provides a soft water filtration system that adopts the following technical solution.

[0011] A soft water filtration system is used according to the above-mentioned antiscaling agent circulation descaling method, including a reverse osmosis body for filtering soft water, a water supply pipe connected to the water inlet of the reverse osmosis body for feeding soft water, a dosing pipe connected to the water supply pipe for feeding antiscaling agent, a clean water pipe connected to the permeated water outlet of the reverse osmosis body, a clean return water pipe connected to the clean water pipe and the water supply pipe, and a clean return water valve for controlling the permeated water to be discharged from the clean water pipe or enter the clean return water pipe.

[0012] By adopting the above technical solution, when it is necessary to add scale inhibitor into the reverse osmosis body, the net return valve is switched so that the permeated water at this time flows back into the reverse osmosis body, making it difficult for the permeated water with scale inhibitor to be directly discharged.

[0013] Optionally, the concentrated water outlet of the reverse osmosis main body is connected to a concentrate water pipe, a concentrate return water pipe is connected between the concentrate water pipe and the water supply pipe, a return control valve for controlling the flow rate in the concentrate return water pipe is provided at the connection between the concentrate water pipe and the concentrate return water pipe, a front flow meter is provided in front of the concentrate water pipe where the concentrate return water pipe is connected to the concentrate water pipe, and a rear flow meter is provided at the rear of the concentrate return water pipe where the concentrate return water pipe is connected to the concentrate water pipe or on the concentrate return water pipe.

[0014] By adopting the above technical solution, the concentrated water return pipe returns a part of the concentrated water to the reverse osmosis body for re-filtration, thereby increasing the water flow rate of the reverse osmosis body and the water production rate of the permeate water that can be obtained per unit volume of soft water. The front flow meter and the rear flow meter are used to accurately control the returned concentrated water, so that it is not easy for excessive permeate water to flow back, reducing the possibility of blockage of the reverse osmosis body.

[0015] Optionally, the clean water pipe is provided with a clean water flow meter, the dosing pipe is connected to a metering pump for conveying antiscalant, and the clean water flow meter, the front flow meter and the metering pump are electrically connected to a controller; When the flow value Q detected by the water flow meter 净 Reduced and the flow value Q detected by the front flow meter 浓 When the flow rate reaches the corresponding threshold, the metering pump starts to operate.

[0016] By adopting the above technical solution, through Q 净 and Q 浓 The two data are tested to more accurately judge the blockage of the RO membrane of the reverse osmosis body, so as to determine the operation time period of the metering pump.

[0017] Optionally, the controller is based on Q 净 and Q 浓 The ratio selects the amount of antiscalant delivered by the metering pump.

[0018] By adopting the above technical solution, when the cleaning cycle is determined, the RO membrane blockage of the reverse osmosis body will also vary to a certain extent. Therefore, each time the scale inhibitor is added, according to Q 净 and Q 浓 The amount of antiscalant that needs to be added is obtained by the ratio, and the antiscalant can be added more accurately. While ensuring sufficient descaling, it is not easy to have too much antiscalant residue in the reverse osmosis body.

[0019] Optionally, a drain pipe is connected between the clean return water pipe and the concentrated water pipe, and a control valve is provided at the connection point between the drain pipe and the clean return water pipe to allow the permeated water to enter the concentrated water pipe or the water supply pipe.

[0020] By adopting the above technical solution, after the antiscalant circulates for a predetermined period of time, the RO membrane in the reverse osmosis body completes descaling, and the permeate water and concentrated water with the antiscalant in the reverse osmosis body need to be directly discharged as soon as possible. To this end, the discharge control valve and the return control valve are switched so that the permeate water and concentrated water will no longer flow back into the reverse osmosis body, but will be directly discharged from the concentrated water pipe, making it difficult for the antiscalant to flow back into the reverse osmosis body, thereby accelerating the speed at which the reverse osmosis body completes the cleaning and re-filtration work.

[0021] Optionally, a tracer detector for detecting the concentration of the antiscalant is provided at the rear position of the concentrate pipe where the discharge pipe is connected to the concentrate pipe, and the tracer detector and the net return valve are electrically connected to a controller.

[0022] By adopting the above technical solution, the scale inhibitor in the water discharged from the concentrated water pipe can be detected so that the net return valve and the control return valve can be switched in time, so that the reverse osmosis body can resume normal filtering work in time.

[0023] Optionally, the clean water pipe is connected to a water storage tank, a water storage valve is provided between the water storage tank and the clean water pipe, a water pump is provided on the water supply pipe body, the water storage tank is connected to the water supply pipe at a position before the water pump, and a cleaning valve is provided between the water supply pipe and the water storage tank.

[0024] By adopting the above technical solution, a certain amount of permeated water is stored in the water tank, so that when it is necessary to add scale inhibitors into the reverse osmosis body, the scale inhibitors can be brought into the reverse osmosis body by using the permeated water stored in the water tank. Compared with directly using soft water to bring the scale inhibitors into the reverse osmosis body, there are no excess calcium and magnesium compounds in the permeated water, which can reduce the use of a certain amount of scale inhibitors, so that there are less scale inhibitors remaining in the reverse osmosis body, and the subsequent cleaning efficiency in the reverse osmosis body can also be improved.

[0025] Optionally, a liquid level sensor is provided in the water storage tank, and the liquid level sensor and the water storage valve are electrically connected to a controller; When the liquid level sensor detects the water level H in the water tank 箱When the water level rises to the threshold, the opening of the water storage valve corresponding to the water storage tank becomes zero. The opening of the water storage valve corresponding to the water storage tank is based on H 箱 The water level is adjusted within the range where H 箱 The higher it is, the smaller the opening of the water storage valve corresponding to the water storage tank.

[0026] By adopting the above technical solution, the water level in the water tank can be accurately controlled, and the opening of the water valve can be continuously adjusted accordingly, so that the water valve gradually decreases as the liquid level in the water tank increases, so that the amount of permeated water discharged from the clean water pipe is not prone to excessive fluctuations in a short period of time, thereby reducing the impact on related equipment or process steps using the permeated water discharged from the clean water pipe.

[0027] Optionally, an auxiliary pump is connected between the water storage tank and the cleaning valve, the cleaning valve is connected to the clean water pipe, and the cleaning valve controls the infiltrated water stored in the water storage tank to enter the clean water pipe or the water delivery pipe.

[0028] By adopting the above technical solution, the permeated water in the water storage tank can also be supplied for use during the maintenance of the reverse osmosis body.

[0029] In summary, the present application includes at least the following beneficial effects: When the internal RO membrane becomes clogged due to the predetermined filtering time of the reverse osmosis body, antiscalants are added and the flow direction of the permeated water is changed so that the permeated water with a certain amount of antiscalants flows back into the reverse osmosis body. On the one hand, the utilization rate of the antiscalants is improved and the amount of antiscalants used is reduced. On the other hand, the permeated water with the antiscalants is not easily discharged directly and does not need to be reprocessed. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flow chart of a method for descaling by circulating an antiscalant; Figure 2 It is a structural diagram of a soft water filtration system; Figure 3 It is a schematic diagram of the structure of the ramp and the lane; Figure 4 This is a schematic diagram of pipeline connection; Figure 5 This is a schematic diagram of the connection between the controller and each valve; Figure 6 It is the control logic diagram.

[0031] Explanation of the reference numerals: 1. Reverse osmosis body; 2. Water supply pipe; 3. Concentrated water pipe; 31. Metering pump; 32. Auxiliary pump; 33. Pump pipe; 34. Pump pipe valve; 35. Check valve; 36. Chemical tank; 37. Heat exchanger; 38. Steam pipe; 4. Clean water pipe; 41. Tracer detector; 42. Controller; 43. Water storage tank; 44. Water pump; 45. Cleaning valve; 46. Water storage valve; 47. Liquid level sensor; 48. Clean water flow meter; 5. Clean return water pipe; 51. Clean return water valve; 52. Dosing pipe; 53. Concentrated return water pipe; 54. Pressure gauge; 55. Return control valve; 56. Front flow meter; 57. Rear flow meter; 58. Drain pipe; 59. Drain control valve. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with the accompanying drawings.

[0033] Embodiment 1: The present application discloses a method for descaling by circulating a scale inhibitor, referring to Figure 1 , specifically including the following steps.

[0034] Step 1: When the RO membrane of the reverse osmosis body 1 needs to be descaled, a scale inhibitor is added to the water inlet of the reverse osmosis body 1; Step 2: Return the permeate produced after adding the scale inhibitor to the water inlet of the reverse osmosis body 1; Step 3: After the predetermined circulation time, stop adding the scale inhibitor and keep the medium circulating. The circulating medium can be soft water or permeate water without scale inhibitor. Step 4: After the medium circulates for a predetermined period of time, the permeated water returns to normal discharge.

[0035] The implementation principle of the antiscalant circulation descaling method in Example 1 of the present application is: when the antiscalant is added, the permeated water is not directly discharged but flows back into the reverse osmosis body 1, so that the permeated water with a certain amount of antiscalant is not easily discharged directly.

[0036] The present application also discloses a soft water filtration system, referring to Figure 2 , including a reverse osmosis body 1 in which an RO membrane is arranged in a membrane shell to achieve reverse osmosis treatment of soft water, the water inlet of the reverse osmosis body 1 is connected to a water supply pipe 2, the body of the water supply pipe 2 is connected to a water pump 44 and a pressure gauge 54, the water pump 44 and the pressure gauge 54 are electrically connected to a controller 42, and the flow direction of the medium in the pipeline in the present application is from front to back, for example, the end of the water supply pipe 2 connected to the reverse osmosis body 1 is the rear end. The position of the water pump 44 on the water supply pipe 2 is limited to be located in front of the pressure gauge 54. The same pump pipe 33 is connected at two positions on the body of the water supply pipe 2, and the water pump 44 is located between the two ends of the pump pipe 33 to reduce the possibility of a blocked pump. And a pump pipe valve 34 for controlling the flow capacity of the pump pipe 33 is provided on the body of the pump pipe 33.

[0037] Reference Figure 2 and Figure 3 The water supply pipe 2 is connected to a dosing pipe 52 located behind the pressure gauge 54, the dosing pipe 52 is connected to a check valve 35, the check valve 35 is connected to a metering pump 31, the check valve 35 limits the soft water in the water supply pipe 2 from entering the metering pump 31, the water inlet of the metering pump 31 is connected to a reagent box 36 storing a scale inhibitor solution, and the metering pump 31 is electrically connected to the controller 42. When the accumulated time of the timer in the controller 42 reaches the preset time, the metering pump 31 runs for a predetermined time to deliver a predetermined amount of scale inhibitor into the reverse osmosis body 1, so that the scale on the RO membrane in the reverse osmosis body 1 can be removed.

[0038] Reference Figure 2 and Figure 3 The permeated water outlet of the reverse osmosis body 1 is connected with a clean water pipe 4 for sending the permeated water for use or storage. The clean water pipe 4 is connected with a clean return water pipe 5 at one end close to the reverse osmosis body 1. The clean return water pipe 5 is connected to the water supply pipe 2 at one end away from the clean water pipe 4, and the position where the water supply pipe 2 is connected to the clean return water pipe 5 is located in front of the water pump 44. A clean return water valve 51 is provided at the connection point between the clean water pipe 4 and the clean return water pipe 5. The clean return water valve 51 can control the permeated water to be directly discharged from the clean water pipe 4 or enter the clean return water pipe 5. The clean return water valve 51 can be a three-way valve or a combination of two two-way valves. In this embodiment, the clean return water valve 51 is composed of two two-way valves. The net return water valve 51 can be a pneumatic valve, a hydraulic valve or a solenoid valve, so that the net return water valve 51 can be electrically connected to the controller 42, so that when the metering pump 31 delivers the scale inhibitor into the reverse osmosis body 1, the net return water valve 51 can be switched synchronously, so that the permeated water enters the net return water pipe 5 at this time.

[0039] Reference Figure 2 and Figure 3 The concentrated water outlet of the reverse osmosis body 1 is connected with a concentrated water pipe 3, and a concentrated water return pipe 53 is connected between the concentrated water pipe 3 and the water supply pipe 2. The position where the water supply pipe 2 is connected to the concentrated water return pipe 53 is located in front of the water pump 44. A control return valve 55 is provided at the connection between the concentrated water return pipe 53 and the concentrated water pipe 3. The control return valve 55 can be a three-way valve or two two-way valves. In this embodiment, the control return valve 55 is composed of two two-way valves. The control return valve 55 is kept open, and the openings of the two two-way valves of the control return valve 55 are different, so that a part of the concentrated water will always flow back to the reverse osmosis body 1, so as to increase the amount of permeated water produced by unit volume of soft water and improve the soft water utilization rate. In addition, a front flow meter 56 and a rear flow meter 57 are provided on the concentrate water pipe 3. The position where the concentrate water pipe 3 is connected to the concentrate return water pipe 53 is located between the front flow meter 56 and the rear flow meter 57. The recovery rate of the concentrated water returned to the reverse osmosis body 1 is calculated based on the flow value detected by the front flow meter 56 and the rear flow meter 57, so that the concentrated water is not easily fed into the reverse osmosis body 1 too much, and the RO membrane of the reverse osmosis body 1 is not easily blocked.

[0040] Reference Figure 2 The body of the concentrated water pipe 3 is connected to a heat exchanger 37, which is located between the reverse osmosis body 1 and the position where the concentrated water pipe 3 is connected to the concentrated water return pipe 53. The heat exchanger 37 is also connected to a steam pipe 38, which is connected to a steam generator so that the concentrated water and steam can exchange heat to achieve the purpose of disinfecting the concentrated water.

[0041] The implementation principle of a soft water filtration system in Example 1 of the present application is as follows: soft water enters the reverse osmosis body 1 through the water supply pipe 2 for filtration, the generated osmotic water is sent out through the clean water pipe 4, a part of the concentrated water is sent out through the concentrated water pipe 3 for treatment, and a part of the concentrated water is sent back to the reverse osmosis body 1 through the concentrated water return pipe 53 for filtration.

[0042] When the metering pump 31 starts to deliver the scale inhibitor, the clean water return valve 51 switches so that the permeated water flows back into the reverse osmosis body 1 , so that the permeated water with the scale inhibitor is not easily discharged directly through the clean water pipe 4 .

[0043] Embodiment 2: Embodiment 2 of the present application discloses a soft water filtration system, referring to Figure 4 and Figure 5 , which is different from the first embodiment, is that a clean water flow meter 48 is provided in the clean water pipe 4 in front of the clean water return valve 51 , and the clean water flow meter 48 is electrically connected to the controller 42 .

[0044] Reference Figure 6 , when the flow value Q detected by the water purification flow meter 48 净 Less than the corresponding flow threshold Q min , and the flow value Q detected by the front flow meter 56 浓 Higher than the corresponding flow threshold Q max When the metering pump 31 is running, the RO membrane in the reverse osmosis body 1 is not easy to continue to work in the case of serious blockage. 净 and Q 浓 The comparison relationship table of the ratio of Q and the antiscalant delivery amount is used to make the controller 42 receive the corresponding Q 净 and Q 浓 Then, calculate Q 净 and Q 浓 The controller 42 obtains the corresponding antiscalant delivery amount by calculating the ratio of ...

[0045] Reference Figure 4 and Figure 5 The clean water pipe 4 is connected to a water storage tank 43 at the rear of the clean water return valve 51. A water storage valve 46 is provided at the connection between the water storage tank 43 and the clean water pipe 4, so that when the reverse osmosis body 1 performs filtering work normally, some water can enter the water storage tank 43 for storage. A liquid level sensor 47 electrically connected to the controller 42 is provided in the water storage tank 43. The liquid level sensor 47 detects the liquid level H in the water storage tank 43 in real time. 箱 The controller 42 outputs a signal. 箱 The table of comparisons between different numerical ranges and the opening of the water storage valve 46 corresponding to the water storage tank 43 is such that when the liquid level sensor 47 detects that the water level in the water storage tank 43 is within a preset range, the controller 42 adjusts the opening of the water storage valve 46 corresponding to the water storage tank 43 to an appropriate value, and H 箱 The higher the value, the smaller the opening of the water storage valve 46 corresponding to the water storage tank 43, until H 箱 When the water level rises to the water level threshold, the opening degree of the water storage valve 46 corresponding to the water storage tank 43 becomes zero.

[0046] Reference Figure 4 and Figure 5 The water tank 43 is connected to an auxiliary pump 32 electrically connected to the controller 42, and the water outlet of the auxiliary pump 32 is connected to a cleaning valve 45 electrically connected to the controller 42. The cleaning valve 45 is connected to the clean water pipe 4 and the water supply pipe 2. The position where the water supply pipe 2 is connected to the cleaning valve 45 is located in front of the position where the water pump 44 is set in the water supply pipe 2, so that the auxiliary pump 32 can send the permeated water in the water tank 43 to the clean water pipe 4 or the water supply pipe 2. When it is necessary to descale the RO membrane of the reverse osmosis body 1, the auxiliary pump 32 sends the permeated water in the water tank 43 to the water supply pipe 2, so as to use the permeated water to bring the scale inhibitor into the reverse osmosis body 1. When it is necessary to maintain the reverse osmosis body 1, when there is a certain need for water, the auxiliary pump 32 can send the water in the water tank 43 to the clean water pipe 4 for use.

[0047] Reference Figure 4 and Figure 5A discharge pipe 58 is connected between the clean return water pipe 5 and the concentrated water pipe 3. A control and discharge valve 59 electrically connected to the controller 42 is provided at the connection point between the discharge pipe 58 and the clean return water pipe 5. After the scale inhibitor circulates in the reverse osmosis body 1 for a certain period of time, the control and discharge valve 59 is switched, so that the permeated water sent out by the clean return water pipe 5 is directly discharged through the concentrated water pipe 3, and the control and return valve 55 controls the concentrated water to no longer enter the concentrated water return pipe 53, so that the permeated water and concentrated water with scale inhibitors produced by the reverse osmosis body 1 are both discharged through the concentrated water pipe 3, thereby accelerating the efficiency of removing the scale inhibitor in the reverse osmosis body 1. A tracer detector 41 for detecting the concentration of the antiscalant is provided at the rear position of the concentrate pipe 3 which is connected to the discharge pipe 58. The tracer detector 41 is electrically connected to the controller 42. When the tracer detector 41 detects that the concentration of the antiscalant in the concentrate pipe 3 is lower than a preset concentration, the net return valve 51 is switched and the control return valve 55 is restored to a preset opening, so that the reverse osmosis body 1 can resume normal filtering operation.

[0048] The implementation principle of a soft water filtration system in the second embodiment of the present application is as follows: 净 and Q 浓 The specific value and the ratio of the two are determined, and a suitable amount of scale inhibitor is timely delivered into the reverse osmosis body 1 to timely and fully perform the descaling work. After the scale inhibitor circulates for a certain period of time, the permeate water and concentrated water with scale inhibitor produced by the reverse osmosis body 1 are discharged through the concentrated water pipe 3 until the value detected by the tracer detector 41 reaches the standard, and then the normal operation of the reverse osmosis body 1 is restored by controlling the net return valve 51 and the control return valve 55.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A scale inhibitor circulation descaling method, characterized in that: The specific steps include: Step 1: When it is necessary to descale the RO membrane of the reverse osmosis body (1), add a scale inhibitor to the water inlet of the reverse osmosis body (1); Step 2: Returning the permeate produced after adding the scale inhibitor to the water inlet of the reverse osmosis body (1); Step 3: After the circulation has lasted for a set period of time, stop adding the scale inhibitor and keep the medium circulating; Step 4: After the medium circulates for a predetermined period of time, the permeated water returns to normal discharge.

2. A soft water filtration system, using the antiscalant circulation descaling method according to claim 1, characterized in that: The invention comprises a reverse osmosis body (1) for filtering soft water, a water supply pipe (2) connected to a water inlet of the reverse osmosis body (1) for supplying soft water, a dosing pipe (52) connected to the water supply pipe (2) for supplying antiscaling agent, a clean water pipe (4) connected to a permeated water outlet of the reverse osmosis body (1), a clean water return pipe (5) connected to the clean water pipe (4) and the water supply pipe (2), and a clean water return valve (51) for controlling the permeated water to be discharged from the clean water pipe (4) or to enter the clean water return pipe (5).

3. A soft water filtration system according to claim 2, characterized in that: The concentrated water outlet of the reverse osmosis body (1) is connected to a concentrated water pipe (3), a concentrated water return pipe (53) is connected between the concentrated water pipe (3) and the water supply pipe (2), a return control valve (55) for controlling the flow rate in the concentrated water return pipe (53) is provided at the connecting point between the concentrated water pipe (3) and the concentrated water return pipe (53), a front flow meter (56) is provided in front of the concentrated water pipe (3) where the concentrated water return pipe (53) connects to the concentrated water pipe (3), and a rear flow meter (57) is provided in the concentrated water pipe (3) where the concentrated water return pipe (53) connects to the concentrated water pipe (3) or at the concentrated water return pipe (53).

4. A soft water filtration system according to claim 3, characterized in that: The clean water pipe (4) is provided with a clean water flow meter (48); the dosing pipe (52) is connected to a metering pump (31) for conveying antiscalant; the clean water flow meter (48), the front flow meter (56) and the metering pump (31) are electrically connected to a controller (42); When the flow value Q detected by the clean water flow meter (48) 净 The flow value Q detected by the front flow meter (56) decreases 浓 When the flow rate reaches the corresponding flow threshold, the metering pump (31) starts to operate.

5. A soft water filtration system according to claim 4, characterized in that: The controller (42) is based on Q 净 and Q 浓 The ratio of selects the amount of antiscalant delivered by the metering pump (31).

6. A soft water filtration system according to claim 2, characterized in that: A discharge pipe (58) is connected between the clean water return pipe (5) and the concentrated water pipe (3), and a control valve (59) is provided at the connection point between the discharge pipe (58) and the clean water return pipe (5) to allow the permeated water to enter the concentrated water pipe (3) or the water supply pipe (2).

7. A soft water filtration system according to claim 6, characterized in that: The concentrated water pipe (3) is provided with a tracer detector (41) for detecting the concentration of the scale inhibitor at a position behind the agent discharge pipe (58) connected to the concentrated water pipe (3), and the tracer detector (41) and the net return water valve (51) are electrically connected to a controller (42).

8. A soft water filtration system according to claim 2, characterized in that: The clean water pipe (4) is connected to a water storage tank (43); a water storage valve (46) is provided between the water storage tank (43) and the clean water pipe (4); a water pump (44) is provided on the body of the water supply pipe (2); the water storage tank (43) is connected to the water supply pipe (2) at a position before the water pump (44); and a cleaning valve (45) is provided between the water supply pipe (2) and the water storage tank (43).

9. A soft water filtration system according to claim 8, characterized in that: A liquid level sensor (47) is provided in the water storage tank (43), and the liquid level sensor (47) and the water storage valve (46) are electrically connected to a controller (42); When the liquid level sensor (47) detects the water level H in the water storage tank (43), 箱 When the water level rises to the water level threshold, the opening of the water storage valve (46) corresponding to the water storage tank (43) becomes zero, and the opening of the water storage valve (46) corresponding to the water storage tank (43) is determined according to H 箱 The water level is adjusted within the range where H 箱 The higher the value, the smaller the opening of the water storage valve (46) corresponding to the water storage tank (43).

10. A soft water filtration system according to claim 8, characterized in that: An auxiliary pump (32) is connected between the water storage tank (43) and the cleaning valve (45), and the cleaning valve (45) is connected to the clean water pipe (4). The cleaning valve (45) controls the permeated water stored in the water storage tank (43) to enter the clean water pipe (4) or the water supply pipe (2).

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