Nanofiltration pipeline direct drinking water zero wastewater discharge integrated device and control method

Abstract

The application discloses a kind of nanofiltration pipeline direct drinking water zero wastewater discharge integrated equipment and control method, and the liquid level sensor is arranged on water purification one tank and water purification two tanks, three ways are arranged with nanofiltration membrane device between reverse washing pipeline, reverse washing pipeline is arranged with reverse washing electric valve, first pressure reducing valve and filtering device, water production circulation pipeline is arranged between water purification one tank and nanofiltration membrane device, the inlet side of water production circulation pipeline is connected with the circulating water outlet of nanofiltration membrane device, water production circulation pipeline is arranged with water production circulation electric valve, three ways electric valve is arranged with ozone activated carbon circulation pipeline between water purification one tank, ozone generation pipeline is connected on water purification one tank, water purification two tanks are arranged with nanofiltration water treatment outdoor circulation pipeline between one branch pipeline.The application can effectively eliminate the change of water flow taste and smell caused by unified disinfection treatment of municipal tap water, ensure the use experience of user, and each process will not discharge wastewater outside system during operation, effectively save water resources.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to an integrated nanofiltration pipeline direct drinking water system with zero wastewater discharge and its control method. Background Technology

[0002] Drinking water in municipal water supply systems is usually disinfected to meet water quality standards. However, disinfection often alters the taste and odor of the water, which is detrimental to the user's water experience. To address these issues uniformly, water treatment facilities must be added at the water supply inlets of communities or building complexes. However, there is a lack of mature equipment of this type on the market. Existing ordinary water treatment equipment generates a lot of wastewater during the water treatment process, resulting in serious water waste. Therefore, there is an urgent need in the market for equipment suitable for cluster applications that does not generate water waste during the water treatment process. Summary of the Invention

[0003] The purpose of this invention is to provide an integrated device and control method for direct drinking water with zero wastewater discharge via nanofiltration pipelines, thereby solving at least one of the technical problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This invention discloses an integrated nanofiltration pipeline direct drinking water system with zero wastewater discharge, comprising a controller, a basic pipeline, and, sequentially arranged from upstream to downstream on the basic pipeline, a raw water electric valve, a primary water tank, a water pump, a T-junction, a biological activated carbon tank, a T-junction electric valve, a flow meter, a nanofiltration membrane device, a water purification electric valve, a secondary water tank, and a water purification booster pump. Multiple branch pipelines are connected to the basic pipeline downstream of the water purification booster pump, and the water supply user port is connected to these branch pipelines. Level sensors are respectively installed on the primary and secondary water tanks. A backwash pipeline is provided between the T-junction and the nanofiltration membrane device, and the backwash pipeline is equipped with a backwash electric valve, a first pressure reducing valve, and a filtration device. A product water circulation pipeline is provided between the primary water tank and the nanofiltration membrane device, and the inlet side of the product water circulation pipeline is connected to the circulating water outlet of the nanofiltration membrane device. A product water circulation electric valve is installed on the product water circulation pipeline. A T-junction electric valve is connected to the primary water tank. An ozone-activated carbon circulation pipeline is provided. An ozone generating pipeline is connected to the first purified water tank. The ozone generating pipeline is equipped with an ozone circulation pump, an ozone electric valve, a second pressure reducing valve, an ozone injector, and a micro / nano bubble generator. The micro / nano bubble generator has an ozone inlet, which is connected to the outlet of the ozone injector. A nanofiltration water treatment outdoor circulation pipeline is provided between the second purified water tank and one of the branch pipelines. The nanofiltration water treatment outdoor circulation pipeline is sequentially equipped with a first scale inhibitor, a large-scale circulation electric valve, a first magnetized water activator, a first precision filter, a third pressure reducing valve, a remote pressure gauge, and a shut-off valve. The controller is electrically connected to the raw water electric valve, the purified water pump, the three-way electric valve, the flow meter, the purified water electric valve, the liquid level sensor, the backwash electric valve, the product water circulation electric valve, the ozone circulation pump, the ozone electric valve, the large-scale circulation electric valve, and the remote pressure gauge.

[0006] Furthermore, the nanofiltration membrane device includes a housing and a hollow nanofiltration membrane tube coaxially installed inside the housing. The housing is provided with a front water inlet, a circulating water outlet, and a rear clean water outlet. The front water inlet and the circulating water outlet are connected to the inner cavity of the hollow nanofiltration membrane tube, and the rear clean water outlet is connected to the outer side of the hollow nanofiltration membrane tube. The basic pipeline is connected to the front water inlet and the rear clean water outlet.

[0007] Furthermore, a connecting pipe is connected in parallel to the basic pipeline. One end of the connecting pipe is connected to the basic pipeline near the upstream side of the water purification electric valve, and the other end is connected to the basic pipeline near the outlet side of the water purification booster pump. A manual valve is installed on the connecting pipe, and the connecting pipe is used for backwashing the two water purification tanks.

[0008] Furthermore, a raw water shut-off valve and a second precision filter are installed on the main pipeline upstream of the raw water electric valve. A second magnetized water activator and a first ultraviolet sterilizer are installed between the raw water electric valve and the first purified water tank. A first pressure sensor and a pressure gauge are installed between the tee and the biological activated carbon tank. A pressure gauge, a first sampling valve, and a third precision filter are installed between the biological activated carbon tank and the flow meter. A check valve and a second scale inhibitor are installed between the flow meter and the nanofiltration membrane device. A second sampling valve and a pressure gauge are installed between the nanofiltration membrane device and the purified water electric valve. A post-activated carbon tank and a filter are installed between the purified water electric valve and the second purified water tank. A second ultraviolet sterilizer is installed between the second purified water tank and the purified water booster pump. A booster pump check valve and a second pressure sensor are installed between the purified water booster pump and the branch pipeline. The first pressure sensor and the second pressure sensor are electrically connected to the controller.

[0009] Furthermore, both the first and second water purification tanks are equipped with a third sampling valve and a water quality monitor, and the water quality monitor is electrically connected to the controller.

[0010] Furthermore, the two water purification tanks are equipped with a breather valve.

[0011] Furthermore, the filtration device is a ceramic membrane filter.

[0012] Furthermore, a ceramic membrane filter is installed on the ozone activated carbon circulation pipeline, the inlet of the ozone injector is connected to an ozone supply line, and an ozone control box responsible for switching the ozone supply on and off is installed at the upstream end of the ozone supply line.

[0013] This invention also provides a control method for a nanofiltration pipeline direct drinking water zero wastewater discharge integrated device, employing the aforementioned nanofiltration pipeline direct drinking water zero wastewater discharge integrated device, the control method comprising:

[0014] The controller opens the raw water electric valve, and the municipal water supply enters the first purified water tank after passing through the second precision filter, the second magnetized water activator, and the first ultraviolet sterilizer. When the liquid level in the first purified water tank rises to the middle level, the purified water pump starts to work. The water in the first purified water tank is drawn out and passes through the biological activated carbon tank, the third precision filter, the flow meter, and the second scale inhibitor before reaching the front inlet of the nanofiltration membrane device. The water flows from the front inlet into the inner cavity of the hollow nanofiltration membrane tube, and then passes through the hollow nanofiltration membrane tube to complete the filtration and enter the rear purified water inlet. The water flow from the rear purified water inlet passes through the post-activated carbon tank and the filter before entering the second purified water tank. The water flow in the second purified water tank can be sent to each branch pipeline by the purified water pressurization pump for use by users.

[0015] When the water purification electric valve is opened or closed, the water purification pump can draw water from the first water purification tank and return it to the first water purification tank through the production water circulation pipeline. During this process, the water will pass through the biological activated carbon tank, the third precision filter and the nanofiltration membrane device for purification, forming the first water purification tank production water circulation system. The water that has been continuously treated is cleaner and has a lower content of pollutants.

[0016] During water production operation, the flow meter feeds back the flow information to the controller. When the accumulated water production reaches the set total flow and the liquid level of the second water purification tank is in a high liquid level state, the water purification electric valve is closed under control, the water production circulation electric valve is fully opened under control, the water purification pump runs, the three-way electric valve switches to the ozone activated carbon circulation pipeline connection state, the ozone generation pipeline runs, and the ozone production process is as follows: the ozone circulation pump draws some water from the first water purification tank and then reaches the micro-nano bubble generator. The ozone gas and micro-nano bubbles sent by the ozone injector are sprayed into the first water purification tank at the same time to form ozone micro-nano bubble water. The water purification pump draws the ozone micro-nano bubble water from the first water purification tank and sends it to the biological activated carbon tank. The water flow from the biological activated carbon tank returns to the first water purification tank from the ozone activated carbon circulation pipeline, forming the ozone activated carbon circulation system. The ozone activated carbon circulation system is set to operate at night.

[0017] During the ozone production process, the backwashing circulation can also be operated. The backwashing circulation process is as follows: the backwash electric valve is opened in a controlled manner, and the ozone micro-nano bubble water flows into the backwash pipeline, passes through the ceramic membrane filter, enters the downstream clean water port, and then passes back through the hollow nanofiltration membrane tube to complete the backwashing sterilization and disinfection of the hollow nanofiltration membrane tube. The backwash water flows out through the circulating water outlet of the nanofiltration membrane device and finally flows into the product water circulation pipeline through the product water circulation electric valve, and then re-enters the clean water tank, forming the backwashing circulation system.

[0018] Furthermore, information on the rise or fall of the liquid levels in the first and second purified water tanks is fed back to the controller to regulate system operation. When the liquid level in the first purified water tank drops from high to medium, the raw water electric valve opens, and the first purified water tank is replenished with water. When the liquid level in the first purified water tank drops to low, the purified water pump stops working, and the first purified water tank stops discharging water. When the liquid level in the second purified water tank drops from high to medium, the purified water electric valve opens, and the purified water pump starts working to replenish the second purified water tank with water. When the liquid level in the second purified water tank rises to high, the purified water electric valve closes, and the purified water pump stops working. When the liquid level in the second purified water tank drops from medium to low, the purified water booster pump stops working. When the liquid level in the second purified water tank rises back to medium, the controller allows the purified water booster pump to start supplying water. When the liquid level in the second purified water tank rises to high, the water purification and production process is completed.

[0019] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0020] The nanofiltration pipeline direct drinking water zero wastewater discharge integrated equipment and control method of the present invention, through the setting of multi-stage filtration treatment measures including biological activated carbon tank and nanofiltration membrane device, can effectively remove harmful substances in municipal water supply, eliminate the changes in water taste and odor caused by the unified disinfection treatment of municipal tap water, and ensure the user experience. At the same time, no wastewater is discharged outside the system during each process, effectively saving water resources. Among them, the ozone activated carbon circulation pipeline can also realize the activation and regeneration of biological activated carbon under control. The system operates stably as a whole, with low maintenance costs, and is suitable for widespread use. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the integrated nanofiltration pipeline direct drinking water zero wastewater discharge device according to Embodiment 1 of the present invention;

[0023] Figure 2 This is a schematic diagram illustrating the working principle of the hollow nanofiltration membrane tube in the nanofiltration pipeline direct drinking water zero wastewater discharge integrated equipment of Embodiment 1 of the present invention.

[0024] Explanation of reference numerals in the attached diagram: 1. Basic pipeline; 2. Raw water electric valve; 3. First purified water tank; 4. Purified water pump; 5. T-junction; 6. Biological activated carbon tank; 7. T-junction electric valve; 8. Flow meter; 9. Nanofiltration membrane device; 10. Purified water electric valve; 11. Second purified water tank; 12. Purified water booster pump; 13. Branch pipeline; 14. Liquid level sensor; 15. Backwash pipeline; 16. Backwash electric valve; 17. First pressure reducing valve; 18. Ceramic membrane filter; 19. Housing; 20. Hollow nanofiltration membrane tube; 21. Product water circulation pipeline; 22. Product water circulation electric valve; 23. Ozone activated carbon circulation pipeline; 24. Ozone generating pipeline; 25. Ozone circulation pump; 26. Ozone electric valve; 27. Second pressure reducing valve; 28. Ozone ejector; 29. ​​Micro / nano bubble generator; 30. Ozone supply line; 31. Nanofiltration membrane device; 22. Micro / nano bubble generator; 33. Micro / nano bubble generator; 44. Micro / nano bubble generator; 5. Micro / nano bubble generator; 6. Micro / nano bubble generator; 7. Micro / nano bubble generator; 8. Micro / nano bubble generator; 9. Micro / nano bubble generator; 10. Micro / nano bubble generator; 11. Micro / nano bubble generator; 22. Micro / nano bubble generator; 23. Micro / nano bubble generator; 24. Micro / nano bubble generator; 25. Micro / nano bubble generator; 26. Micro / nano bubble generator; 27. Micro / nano bubble generator; 28. Micro / nano bubble generator; 29. ​​Micro / nano bubble generator; 20. Micro / nano bubble generator; 21. Micro / nano bubble generator; 22. Micro / nano 32. Outdoor circulating pipeline for water filtration; 33. First scale inhibitor; 34. Electric valve for large-scale circulation; 35. First magnetized water activator; 36. First precision filter; 37. Third pressure reducing valve; 38. Remote pressure gauge; 39. Shut-off valve; 40. Connecting pipeline; 41. Manual valve; 42. Raw water shut-off valve; 43. Second precision filter; 44. First ultraviolet sterilizer; 45. First pressure sensor; 46. First sampling valve; 47. Third precision filter; 48. Check valve; 49. Second scale inhibitor; 50. Second sampling valve; 51. Post-activated carbon tank; 52. Filter; 53. Second ultraviolet sterilizer; 54. Pressure pump check valve; 55. Second pressure sensor; 56. Third sampling valve; 57. Water quality monitor; 58. Breathing valve. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of this invention, it should be understood that the terms "length," "width," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Example 1

[0030] like Figure 1 , Figure 2 As shown, the nanofiltration pipeline direct drinking water zero wastewater discharge integrated equipment of this embodiment 1 includes a controller, a basic pipeline 1, and raw water electric valve 2, purified water tank 3, purified water pump 4, tee 5, biological activated carbon tank 6, tee electric valve 7, flow meter 8, nanofiltration membrane device 9, purified water electric valve 10, purified water tank 11, and purified water booster pump 12 arranged sequentially from upstream to downstream on the basic pipeline 1. Multiple branch pipelines 13 are connected to the basic pipeline 1 downstream of the purified water booster pump 12. The water supply user port is connected to the branch pipelines 13. Liquid level sensors 14 are respectively installed on purified water tank 3 and purified water tank 11.

[0031] Preferably, the level sensor 14 is a pressure level sensor, the water purification pump 4 and the water purification booster pump 12 are both variable frequency pumps, and there are two water purification booster pumps 12, which can be used simultaneously or one can be used as a backup; the flow meter 8 is a remote metal float flow meter.

[0032] A backwashing pipeline 15 is provided between the three-way valve 5 and the nanofiltration membrane device 9. The backwashing pipeline 15 is equipped with a backwashing electric valve 16, a first pressure reducing valve 17 and a filter device, specifically a ceramic membrane filter 18.

[0033] Furthermore, the nanofiltration membrane device 9 includes a housing 19 and a hollow nanofiltration membrane tube 20 coaxially installed inside the housing 19. The housing 19 is provided with a front water inlet, a circulating water outlet and a rear clean water outlet. The front water inlet and the circulating water outlet are connected to the inside of the hollow nanofiltration membrane tube 20, and the rear clean water outlet is connected to the outside of the hollow nanofiltration membrane tube 20. The basic pipeline 1 is connected to the front water inlet and the rear clean water outlet.

[0034] In this embodiment, a water production circulation pipeline 21 is also provided between the water purification tank 3 and the nanofiltration membrane device 9. The inlet side of the water production circulation pipeline 21 is connected to the circulating water outlet, and a water production circulation electric valve 22 is provided on the water production circulation pipeline 21.

[0035] At this time, an ozone activated carbon circulation pipeline 23 is installed between the three-way electric valve 7 and the purified water tank 3. A ceramic membrane filter 18 is also installed on the ozone activated carbon circulation pipeline 23. An ozone generating pipeline 24 is also connected to the purified water tank 3. An ozone circulation pump 25, an ozone electric valve 26, a second pressure reducing valve 27, an ozone injector 28, and a micro-nano bubble generator 29 are installed on the ozone generating pipeline 24. The micro-nano bubble generator 29 has an ozone air inlet, which is connected to the outlet of the ozone injector 28. The inlet of the ozone injector 28 is connected to an ozone supply line 30. An ozone control box is installed at the upstream end of the ozone supply line 30, which is responsible for the on / off of the ozone supply.

[0036] Specifically, the controller is electrically connected to the raw water electric valve 2, the purified water pump 4, the three-way electric valve 7, the flow meter 8, the purified water electric valve 10, the liquid level sensor 14, the backwash electric valve 16, the product water circulation electric valve 22, the ozone circulation pump 25, and the ozone electric valve 26. Preferably, the controller is a PLC controller.

[0037] In this embodiment, a nanofiltration water treatment outdoor circulation pipeline 31 is also provided between the two water purification tanks 11 and a certain branch pipeline 13 to realize the timed circulation process of the outdoor pipeline network at the user end. Specifically, the nanofiltration water treatment outdoor circulation pipeline 31 is equipped with a first scale inhibition device 32, a pipeline large circulation electric valve 33, a first magnetized water activator 34, a first precision filter 35, a third pressure reducing valve 36, a remote pressure gauge 37, and a shut-off valve 38. The pipeline large circulation electric valve 33 and the remote pressure gauge 37 are also electrically connected to the controller. Preferably, the first scale inhibition device 32 is a filter screen.

[0038] Water from the second water tank 11 is delivered to branch pipe 13, and return water flows back to the second water tank 11 from a selected branch pipe 13. This realizes a timed large-scale circulation of water supply and return in the outdoor pipe network at the user end. For example, the outdoor circulation pipe of nanofiltration water treatment can be set to circulate once every 12 hours, for a total of 2 times a day, with each circulation lasting 2-4 hours, to avoid the formation of stagnant water.

[0039] Furthermore, a connecting pipe 39 is connected in parallel to the basic pipe 1. One end of the connecting pipe 39 is connected to the basic pipe 1 near the upstream side of the water purification electric valve 10, and the other end is connected to the basic pipe 1 near the outlet side of the water purification booster pump 12. A manual valve 40 is installed on the connecting pipe 39. When the connecting pipe 39 is turned on and the water purification electric valve 10 is turned off, it can be used for backwashing of the second water purification tank 11.

[0040] The basic pipeline 1 upstream of the raw water electric valve 2 is also equipped with a raw water shut-off valve 41 and a second precision filter 42. The basic pipeline 1 between the raw water electric valve 2 and the purified water tank 3 is also equipped with a second magnetized water activator 43 and a first ultraviolet sterilizer 44. The basic pipeline 1 between the tee 5 and the biological activated carbon tank 6 is also equipped with a first pressure sensor 45 and a pressure gauge, and the first pressure sensor 45 is electrically connected to the controller. The basic pipeline 1 between the biological activated carbon tank 6 and the flow meter 8 is also equipped with a pressure gauge, a first sampling valve 46, and a third precision filter 47. The basic pipeline 1 between the flow meter 8 and the nanofiltration membrane device 9 is also equipped with a stop valve. The return valve 48 and the second scale inhibition device 49 are also filters; a second sampling valve 50 and a pressure gauge are installed on the basic pipeline 1 between the nanofiltration membrane device 9 and the water purification electric valve 10; a post-activated carbon tank 51 and a filter 52 are also installed on the basic pipeline 1 between the water purification electric valve 10 and the second water purification tank 11, and the filter 52 is a pleated precision filter; a second ultraviolet sterilizer 53 is installed on the basic pipeline 1 between the second water purification tank 11 and the water purification booster pump 12; a booster pump check valve 54 and a second pressure sensor 55 electrically connected to the controller are installed on the basic pipeline 1 between the water purification booster pump 12 and the branch pipeline 13.

[0041] Furthermore, both the first water tank 3 and the second water tank 11 are equipped with a third sampling valve 56 and a water quality monitor 57. The water quality monitor 57 is electrically connected to the controller. The second water tank 11 is also equipped with a separate breather valve 58.

[0042] The working process of the nanofiltration pipeline direct drinking water zero wastewater discharge integrated equipment in this embodiment 1 is as follows: The controller controls the raw water electric valve 2 to open. The municipal water supply enters the purified water tank 3 after passing through the second precision filter 42, the second magnetized water activator 43 and the first ultraviolet sterilizer 44. When the liquid level in the purified water tank 3 rises to the middle level, the purified water pump 4 starts to work. The water in the purified water tank 3 is drawn out and passes through the biological activated carbon tank 6, the precision filter 47, the flow meter 8 and the second scale inhibitor 49 before reaching the front inlet of the nanofiltration membrane device 9. The water flows from the front inlet into the inner cavity of the hollow nanofiltration membrane tube 20, and then passes through the hollow nanofiltration membrane tube 20 to complete the filtration and enter the rear purified water inlet. The water flow from the rear purified water inlet enters the purified water tank 11 after passing through the post-activated carbon tank 51 and the filter 52. The water flow in the purified water tank 11 can be sent to each branch pipeline 13 by the purified water booster pump 12 for use by the user.

[0043] When the water purification electric valve 10 is opened or closed, the water purification pump 4 can draw water from the water purification tank 3 and return it to the water purification tank 3 through the water production circulation pipeline 21. During this process, the water will be purified by the biological activated carbon tank 6, the third precision filter 47 and the nanofiltration membrane device 9, forming the water production circulation system of the water purification tank 3. The water that is continuously treated will be cleaner and have a lower content of pollutants.

[0044] Information on the rise or fall of the liquid levels in water tank 3 (purified water tank 1) and water tank 11 (purified water tank 2) is fed back to the controller to regulate system operation. Specifically, when the liquid level in water tank 3 drops from high to medium, the raw water electric valve 2 opens, and water is added to water tank 3; when the liquid level in water tank 3 drops to low, the water pump 4 stops working, and water no longer flows from water tank 3; when the liquid level in water tank 11 drops from high to medium, the water electric valve 10 opens, and the water pump 4 starts working to add water to water tank 11; when the liquid level in water tank 11 rises to high, the water electric valve 10 closes, and the water pump 4 stops working; when the liquid level in water tank 11 drops from medium to low, the water booster pump 12 stops working; when the liquid level in water tank 11 rises back to medium, the controller allows the water booster pump 12 to start water supply; when the liquid level in water tank 11 rises to high, the water purification process is complete.

[0045] It should be noted that when this equipment produces water, the water circulation electric valve 22 installed on the water circulation pipeline 21 is kept at a certain opening, for example, 20%. The purified water produced by the nanofiltration membrane device 9 enters the purified water tank 11. The water that cannot pass through the hollow nanofiltration membrane tube 20 is sent out from the circulation water outlet into the water circulation pipeline 21 and returned to the purified water tank 3 for further treatment. This combination avoids wastewater discharge and effectively saves water resources.

[0046] During water production operation, flow meter 8 feeds back flow information to the controller. When the accumulated water production reaches the set total flow and the liquid level in the second water tank 11 is at a high level, the water purification electric valve 10 is closed, the water production circulation electric valve 21 is fully opened, the water purification pump 4 runs, the three-way electric valve 7 switches to the ozone activated carbon circulation pipeline 23 connected state, and the ozone generation pipeline 24 runs. The ozone generation process is as follows: the ozone circulation pump 25 draws some water from the first water tank 3 and then reaches the micro-nano bubble generator 29, where the ozone gas is delivered by the ozone ejector 28. Simultaneously sprayed into the water purification tank 3 along with micro-nano bubbles, ozone micro-nano bubble water is formed. The water purification pump 4 extracts the ozone micro-nano bubble water from the water purification tank 3 and sends it to the biological activated carbon tank 6. The ozone micro-nano bubbles generated by the micro-nano bubble generator 29 and the ozone generator 28 can not only purify harmful substances, but also oxidize and activate the biological activated carbon, restoring its activity. The water flow from the biological activated carbon tank 6 returns to the water purification tank 3 through the ozone activated carbon circulation pipeline 23, forming an ozone activated carbon circulation system. The ozone activated carbon circulation system is set to operate at night.

[0047] During the above process, the backwashing cycle can also be operated. Specifically, the backwashing electric valve 16 is opened in a controlled manner, and the ozone micro-nano bubble water flows into the backwashing pipeline 15, passes through the ceramic membrane filter 18, enters the back-end clean water port, and then passes back through the hollow nanofiltration membrane tube 20 to complete the backwashing sterilization and disinfection of the hollow nanofiltration membrane tube 20. The backwash water flows out through the circulating water outlet of the nanofiltration membrane device 9 and finally flows into the product water circulation pipeline 21 through the product water circulation electric valve 22 and then re-enters the clean water tank 3, forming a backwashing circulation system.

[0048] In actual use, the nanofiltration membrane device 9 can be backwashed and disinfected periodically according to the total flow rate of the produced water. Regular membrane backwashing will extend the life of the hollow nanofiltration membrane tube 20 and restore the water production rate of the hollow nanofiltration membrane tube 20.

[0049] In the event of a conflict during operation, the nanofiltration pipeline direct drinking water zero wastewater discharge integrated equipment of this embodiment 1 shall have the following priority order: water replenishment for the two water tanks 11, ozone activated carbon circulation system, backwashing system, and nanofiltration water treatment outdoor circulation system.

[0050] Example 2

[0051] The control method for the nanofiltration pipeline direct drinking water zero wastewater discharge integrated equipment in Embodiment 2 uses the aforementioned nanofiltration pipeline direct drinking water zero wastewater discharge integrated equipment, and the control method includes:

[0052] The controller controls the opening of the raw water electric valve 2. The municipal water supply enters the purified water tank 3 after passing through the second precision filter 42, the second magnetized water activator 43 and the first ultraviolet sterilizer 44. When the liquid level in the purified water tank 3 rises to the middle level, the purified water pump 4 starts to work. The water in the purified water tank 3 is drawn out and passes through the biological activated carbon tank 6, the third precision filter 47, the flow meter 8 and the second scale inhibitor 49 before reaching the front inlet of the nanofiltration membrane device 9. The water flows from the front inlet into the inner cavity of the hollow nanofiltration membrane tube 20, and then passes through the hollow nanofiltration membrane tube 20 to complete the filtration and enter the rear purified water outlet. The water flow from the rear purified water outlet passes through the post-activated carbon tank 51 and the filter 52 before entering the purified water tank 11. The water flow in the purified water tank 11 can be sent to each branch pipeline 13 by the purified water booster pump 12 for use by users.

[0053] When the water purification electric valve 10 is opened or closed, the water purification pump 4 can draw out the water in the water purification tank 3 and return it to the water purification tank 3 through the water production circulation pipeline 21. During this process, the water will be purified by the biological activated carbon tank 6, the third precision filter 47 and the nanofiltration membrane device 9, forming the water production circulation system of the water purification tank 3. The water that has been continuously treated is cleaner and has a lower content of pollutants.

[0054] During water production operation, the flow meter 8 feeds back the flow information to the controller. When the cumulative water production reaches the set total flow and the liquid level of the second water tank 11 is in a high liquid level state, the water purification electric valve 10 is closed under control, the water production circulation electric valve 21 is fully opened under control, the water purification pump 4 runs, the three-way electric valve 7 switches to the ozone activated carbon circulation pipeline 23 connected state, the ozone generation pipeline 24 runs, and the ozone production process is as follows: the ozone circulation pump 25 draws some water out of the first water tank 3 and then reaches the micro-nano bubble generator 29. The ozone gas sent out by the ozone injector 28 and the micro-nano bubbles are sprayed into the first water tank 3 at the same time to form ozone micro-nano bubble water. The water purification pump 4 draws the ozone micro-nano bubble water from the first water tank 3 and sends it to the biological activated carbon tank 6. The water flow sent out by the biological activated carbon tank 6 returns to the first water tank 3 from the ozone activated carbon circulation pipeline 23 to form the ozone activated carbon circulation system. The ozone activated carbon circulation system is set to operate at night.

[0055] During the ozone production process, the backwashing circulation can also be operated. The backwashing circulation process is as follows: the backwash electric valve 16 is opened in a controlled manner, and the ozone micro-nano bubble water flows into the backwash pipeline 15, passes through the ceramic membrane filter 18, enters the back-end clean water port, and then passes back through the hollow nanofiltration membrane tube 20 to complete the backwashing sterilization and disinfection of the hollow nanofiltration membrane tube 20. The backwash water flows out through the circulating water outlet of the nanofiltration membrane device 9 and finally flows into the product water circulation pipeline 21 through the product water circulation electric valve 22, and then re-enters the clean water tank 3, forming the backwashing circulation system.

[0056] Preferably, the information on the rise or fall of the liquid level in the first water tank 3 and the second water tank 11 is fed back to the controller to regulate the system operation. When the liquid level in the first water tank 3 drops from a high level to a medium level, the raw water electric valve 2 opens, and the first water tank 3 is replenished with water. When the liquid level in the first water tank 3 drops to a low level, the water pump 4 stops working, and the first water tank 3 stops discharging water. When the liquid level in the second water tank 11 drops from a high level to a medium level, the water electric valve 10 opens, and the water pump 4 starts working to replenish the second water tank 11 with water. When the liquid level in the second water tank 11 rises to a high level, the water electric valve 10 closes, and the water pump 4 stops working. When the liquid level in the second water tank 11 drops from a medium level, the water booster pump 12 stops working. When the liquid level in the second water tank 11 rises back to a medium level, the controller allows the water booster pump 12 to start supplying water. When the liquid level in the second water tank 11 rises to a high level, the water purification and production process is completed.

[0057] The nanofiltration pipeline direct drinking water zero wastewater discharge integrated equipment and control method of the present invention, through the setting of multi-stage filtration treatment measures including biological activated carbon tank and nanofiltration membrane device, can effectively remove harmful substances in municipal water supply, eliminate the changes in water taste and odor caused by the unified disinfection treatment of municipal tap water, and ensure the user experience. At the same time, no wastewater is discharged outside the system during each process, effectively saving water resources. Among them, the ozone activated carbon circulation pipeline can also realize the activation and regeneration of biological activated carbon under control. The system operates stably as a whole, with low maintenance costs, and is suitable for widespread use.

[0058] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A control method of a nanofiltration pipeline direct drinking water zero wastewater discharge integrated device, characterized in that, The nanofiltration pipeline direct drinking water zero wastewater discharge integrated equipment includes a controller, a basic pipeline, and, sequentially arranged from upstream to downstream on the basic pipeline, a raw water electric valve, a primary water tank, a water pump, a T-junction, a biological activated carbon tank, a T-junction electric valve, a flow meter, a nanofiltration membrane device, a water purification electric valve, a secondary water tank, and a water purification booster pump. Multiple branch pipelines are connected to the basic pipeline downstream of the water purification booster pump, and the water supply user port is connected to these branch pipelines. Level sensors are installed on the primary and secondary water tanks. A backwash pipeline is provided between the T-junction and the nanofiltration membrane device, and this backwash pipeline includes a backwash electric valve, a first pressure reducing valve, and a filter device. A product water circulation pipe is provided between the primary water tank and the nanofiltration membrane device. The pipeline is configured such that the inlet of the product water circulation pipeline is connected to the circulation water outlet of the nanofiltration membrane device, the front inlet and the circulation water outlet of the nanofiltration membrane device are connected to the inner cavity of the hollow nanofiltration membrane tube, and the rear purified water outlet is connected to the outer side of the hollow nanofiltration membrane tube. A product water circulation electric valve is installed on the product water circulation pipeline. An ozone activated carbon circulation pipeline is installed between the three-way electric valve and the purified water tank. An ozone generating pipeline is connected to the purified water tank. The ozone generating pipeline is equipped with an ozone circulation pump, an ozone electric valve, a second pressure reducing valve, an ozone injector, and a micro / nano bubble generator. The micro / nano bubble generator has an ozone inlet, which is connected to the outlet of the ozone injector. The control method includes: During water production operation, the flow meter feeds back the flow information to the controller. When the accumulated water production reaches the set total flow and the liquid level of the second water tank is in a high liquid level state, the water purification electric valve is closed under control, the water production circulation electric valve is fully opened under control, the water purification pump runs, the three-way electric valve switches to the ozone activated carbon circulation pipeline connection state, the ozone generation pipeline runs, and the ozone generation process is as follows: the ozone circulation pump draws some water from the first water tank and then reaches the micro-nano bubble generator. The ozone gas delivered by the ozone injector and the micro-nano bubbles are simultaneously sprayed into the first water tank to form ozone micro-nano bubble water. The water purification pump draws the ozone micro-nano bubble water from the first water tank and sends it to the biological activated carbon tank. The water flow from the biological activated carbon tank returns to the first water tank from the ozone activated carbon circulation pipeline, forming the ozone activated carbon circulation system. During the ozone production process, the backwashing circulation also operates. The backwashing circulation process is as follows: the backwash electric valve is opened in a controlled manner, and the ozone micro-nano bubble water flows into the backwash pipeline, passes through the filtration device, enters the rear water outlet of the nanofiltration membrane device, and then passes back through the hollow nanofiltration membrane tube to complete the backwashing sterilization and disinfection of the hollow nanofiltration membrane tube. The backwash water flows out through the circulating water outlet of the nanofiltration membrane device and finally flows into the product water circulation pipeline through the product water circulation electric valve, and then re-enters the purified water tank, forming the backwashing circulation system.

2. The control method of the integrated nanofiltration plumbing direct drinking water zero wastewater discharge apparatus according to claim 1, characterized in that, A nanofiltration water treatment outdoor circulation pipeline is installed between the two water purification tanks and one of the branch pipelines. The nanofiltration water treatment outdoor circulation pipeline is sequentially equipped with a first scale inhibition device, a large-scale circulation electric valve, a first magnetized water activator, a first precision filter, a third pressure reducing valve, a remote pressure gauge, and a shut-off valve. The controller is electrically connected to the raw water electric valve, the purified water pump, the three-way electric valve, the flow meter, the purified water electric valve, the liquid level sensor, the backwash electric valve, the product water circulation electric valve, the ozone circulation pump, the ozone electric valve, the large-scale circulation electric valve, and the remote pressure gauge.

3. The control method of the integrated nanofiltration plumbing direct drinking water zero wastewater discharge apparatus according to claim 1, characterized in that, The nanofiltration membrane device includes a housing and a hollow nanofiltration membrane tube coaxially installed in the housing. The housing is provided with a front water inlet, a circulating water outlet and a rear clean water outlet. The basic pipeline is connected to the front water inlet and the rear clean water outlet.

4. The control method of the integrated nanofiltration plumbing direct drinking water zero wastewater discharge apparatus of claim 1, wherein, A connecting pipe is connected in parallel to the basic pipeline. One end of the connecting pipe is connected to the basic pipeline near the upstream side of the water purification electric valve, and the other end is connected to the basic pipeline near the outlet side of the water purification booster pump. A manual valve is installed on the connecting pipe, which is used for backwashing the two water purification tanks.

5. The control method of the integrated nanofiltration plumbing direct drinking water zero wastewater discharge apparatus of claim 1, wherein, A raw water shut-off valve and a second precision filter are installed on the main pipeline upstream of the raw water electric valve. A second magnetized water activator and a first ultraviolet sterilizer are installed between the raw water electric valve and the first purified water tank. A first pressure sensor and a pressure gauge are installed between the tee and the biological activated carbon tank. A pressure gauge, a first sampling valve, and a third precision filter are installed between the biological activated carbon tank and the flow meter. A check valve and a second scale inhibitor are installed between the flow meter and the nanofiltration membrane device. A second sampling valve and a pressure gauge are installed between the nanofiltration membrane device and the purified water electric valve. A post-activated carbon tank and a filter are installed between the purified water electric valve and the second purified water tank. A second ultraviolet sterilizer is installed between the second purified water tank and the purified water booster pump. A booster pump check valve and a second pressure sensor are installed between the purified water booster pump and the branch pipeline. The first pressure sensor and the second pressure sensor are electrically connected to the controller.

6. The control method for the nanofiltration pipeline direct drinking water zero wastewater discharge integrated equipment according to claim 1, characterized in that, Both the first and second water purification tanks are equipped with a third sampling valve and a water quality monitor, and the water quality monitor is electrically connected to the controller.

7. The control method of the integrated nanofiltration plumbing direct drinking water zero wastewater discharge apparatus of claim 1, wherein, The filtration device is a ceramic membrane filter.

8. The control method of the integrated nanofiltration plumbing direct drinking water zero wastewater discharge apparatus of claim 1, wherein, A ceramic membrane filter is installed on the ozone activated carbon circulation pipeline, and the inlet of the ozone injector is connected to an ozone supply line. An ozone control box responsible for switching the ozone supply on and off is installed at the upstream end of the ozone supply line.

9. The control method of the integrated device of the zero wastewater discharge of the nanofiltration pipeline direct drinking water according to claim 5, characterized in that, The controller opens the raw water electric valve, and the municipal water supply enters the first purified water tank after passing through the second precision filter, the second magnetized water activator, and the first ultraviolet sterilizer. When the liquid level in the first purified water tank rises to the middle level, the purified water pump starts to work. The water in the first purified water tank is drawn out and passes through the biological activated carbon tank, the third precision filter, the flow meter, and the second scale inhibitor before reaching the front inlet of the nanofiltration membrane device. The water flows from the front inlet into the inner cavity of the hollow nanofiltration membrane tube, and then passes through the hollow nanofiltration membrane tube to complete the filtration and enter the rear purified water inlet. The water flow from the rear purified water inlet passes through the post-activated carbon tank and the filter before entering the second purified water tank. The water flow in the second purified water tank can be sent to each branch pipeline by the purified water pressurization pump for use by users. When the water purification electric valve is opened or closed, the water purification pump can draw water from the first water purification tank and return it to the first water purification tank through the production water circulation pipeline. During this process, the water will pass through the biological activated carbon tank, the third precision filter and the nanofiltration membrane device for purification, forming the first water purification tank production water circulation system. The water that has been continuously treated is cleaner and has a lower content of pollutants.

10. The control method of the integrated nanofiltration plumbing direct drinking water zero wastewater discharge apparatus according to claim 9, characterized in that, Information on the rise or fall of the liquid levels in Water Purifier 1 and Water Purifier 2 is fed back to the controller to regulate system operation. When the liquid level in Water Purifier 1 drops from high to medium, the raw water electric valve opens, and Water Purifier 1 is replenished. When the liquid level in Water Purifier 1 drops to low, the water purification pump stops working, and Water Purifier 1 stops discharging water. When the liquid level in Water Purifier 2 drops from high to medium, the water purification electric valve opens, and the water purification pump starts working to replenish Water Purifier 2. When the liquid level in Water Purifier 2 rises to high, the water purification electric valve closes, and the water purification pump stops working. When the liquid level in Water Purifier 2 drops from medium to low, the water purification booster pump stops working. When the liquid level in Water Purifier 2 rises back to medium, the controller allows the water purification booster pump to start supplying water. When the liquid level in Water Purifier 2 rises to high, the water purification process is complete.

Images