Intelligent multi-stage concentrated water purification system for secondary water supply

Abstract

The application relates to the technical field of secondary water supply, in particular to an intelligent multi-stage concentrated water purification utilization system for secondary water supply, which is characterized in that the system comprises a raw water supply tank, a raw water purification device, a pure water storage tank, a concentrated water storage tank, a multi-stage concentrated water purification device and a waste water storage tank; the raw water supply tank is used for supplying raw water to the raw water purification device through a raw water pump and a raw water electromagnetic valve; the raw water purification device is used for purifying raw water and supplying pure water and concentrated water generated by the raw water purification device into the pure water storage tank and the concentrated water storage tank respectively; the concentrated water storage tank is used for supplying concentrated water to the multi-stage concentrated water purification device through a concentrated water pump and a concentrated water electromagnetic valve; and the multi-stage concentrated water purification device is used for multi-stage purifying concentrated water and supplying purified water and waste water generated by the multi-stage concentrated water purification device into the raw water supply tank and the waste water storage tank respectively. The application can purify the water quality of secondary water supply, and the concentrated water generated in the water quality purification process can be purified again and recycled.

Description

Technical Field

[0001] This invention relates to the field of secondary water supply technology, and more specifically to an intelligent multi-stage concentrated water purification and utilization system for secondary water supply. Background Technology

[0002] With the development of urbanization in my country, the number of high-rise buildings has increased rapidly. High-rise buildings generally use secondary water supply, which means that units or individuals store and pressurize the water supplied by the city's public water supply or self-built facilities, and then supply it to users or themselves through water supply pipelines. However, due to the uncontrollable contents of the water supply pipelines and the contents of the storage locations, it is very easy to cause pollution to the water supply, putting great pressure on household water purification, especially in secondary water supply systems with water tanks or pools. At the same time, the pipe materials, scale, corrosion, pipe bursts, backflow, etc. of the tap water network will also affect the water quality of tap water. Long-distance and long-term pipeline transportation of tap water will also cause water quality deterioration. Therefore, it is necessary to provide water purification for secondary water supply and to further purify and recycle the concentrated water generated during the water purification process. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an intelligent multi-stage concentrated water purification and utilization system for secondary water supply, which can purify the water quality of secondary water supply and further purify and recycle the concentrated water generated in the water purification process.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: an intelligent multi-stage concentrated water purification and utilization system for secondary water supply, including a raw water supply tank, a raw water purification device, a pure water storage tank, a concentrated water storage tank, a multi-stage concentrated water purification device, and a wastewater storage tank. The raw water supply tank supplies raw water to the raw water purification device through a raw water pump and a raw water solenoid valve. The raw water purification device purifies the raw water and supplies the pure water and concentrated water produced to the pure water storage tank and the concentrated water storage tank, respectively. The concentrated water storage tank supplies concentrated water to the multi-stage concentrated water purification device through a concentrated water pump and a concentrated water solenoid valve. The multi-stage concentrated water purification device purifies the concentrated water in multiple stages and supplies the purified water and wastewater produced to the raw water supply tank and the wastewater storage tank, respectively. The raw water pump, the raw water solenoid valve, the concentrated water pump, and the concentrated water solenoid valve are all electrically connected to the control cabinet.

[0005] Furthermore, the raw water purification device includes a multi-media filter, an activated carbon filter, a raw water security filter, an ultrafiltration membrane module, a high-pressure pump, and a nanofiltration membrane module connected in sequence. An ultrafiltration inlet solenoid valve is installed on the ultrafiltration inlet pipe between the raw water security filter and the ultrafiltration membrane module, and an ultrafiltration outlet solenoid valve is installed on the ultrafiltration outlet pipe between the ultrafiltration membrane module and the high-pressure pump. The high-pressure pump, the ultrafiltration inlet solenoid valve, and the ultrafiltration outlet solenoid valve are all electrically connected to the control cabinet.

[0006] Furthermore, the pure water storage tank consists of three tanks: a primary water quality storage tank, a secondary water quality storage tank, and a tertiary water quality storage tank. A primary water quality inlet solenoid valve is installed on the primary water quality inlet pipe between the raw water security filter and the primary water quality storage tank. A secondary water quality inlet solenoid valve is installed on the secondary water quality inlet pipe between the ultrafiltration membrane module's ultrafiltration outlet and the secondary water quality storage tank. A tertiary water quality inlet solenoid valve is installed on the tertiary water quality inlet pipe between the nanofiltration membrane module's nanofiltration outlet and the tertiary water quality storage tank. An ultrafiltration backwash inlet is located between the raw water security filter and the ultrafiltration membrane module's ultrafiltration backwash inlet. The pipeline is equipped with an ultrafiltration backwash inlet solenoid valve, and an ultrafiltration backwash drain solenoid valve is installed on the ultrafiltration backwash drain pipeline between the ultrafiltration membrane module and the concentrate storage tank. A flushing solenoid valve is installed on the nanofiltration backwash drain pipeline between the nanofiltration membrane module and the concentrate storage tank. A concentrate regulating valve is also installed on the nanofiltration backwash drain pipeline in parallel with the flushing solenoid valve. The primary water quality inlet solenoid valve, the secondary water quality inlet solenoid valve, the tertiary water quality inlet solenoid valve, the ultrafiltration backwash inlet solenoid valve, the ultrafiltration backwash drain solenoid valve, and the flushing solenoid valve are all electrically connected to the control cabinet.

[0007] Furthermore, the outlet of the primary water quality storage tank is connected to the primary water quality pump. A primary water supply solenoid valve, a first pressure stabilizing tank, and a first ultraviolet sterilizer are sequentially installed on the primary water supply pipeline between the primary water quality pump and the primary water terminal. The outlet of the secondary water quality storage tank is connected to the secondary water quality pump. A secondary water supply solenoid valve, a second pressure stabilizing tank, and a second ultraviolet sterilizer are sequentially installed on the secondary water supply pipeline between the secondary water quality pump and the secondary water terminal. The outlet of the tertiary water quality storage tank is connected to the tertiary water quality pump. A tertiary water supply solenoid valve, a third pressure stabilizing tank, and a third ultraviolet sterilizer are sequentially installed on the tertiary water supply pipeline between the tertiary water quality pump and the tertiary water terminal. The primary water quality pump, the primary water supply solenoid valve, the first ultraviolet sterilizer, the secondary water quality pump, the secondary water supply solenoid valve, the second ultraviolet sterilizer, the tertiary water quality pump, the tertiary water supply solenoid valve, and the third ultraviolet sterilizer are all electrically connected to the control cabinet.

[0008] Furthermore, a primary return water pipe is provided between the primary water pump and the multi-media filter, and a primary return water solenoid valve is installed on the primary return water pipe. A primary water quality monitor and a primary water quality flow meter are installed on the primary water inlet pipe. A secondary return water pipe is provided between the secondary water pump and the ultrafiltration inlet of the ultrafiltration membrane module, and a secondary return water solenoid valve is installed on the secondary return water pipe. A secondary water quality monitor and a secondary water quality flow meter are installed on the secondary water inlet pipe. A tertiary return water pipe is provided between the tertiary water pump and the high-pressure pump, and a tertiary return water solenoid valve is installed on the tertiary return water pipe. A tertiary water quality monitor and a tertiary water quality flow meter are installed on the tertiary water inlet pipe. The primary return water solenoid valve, primary water quality monitor, primary water quality flow meter, secondary return water solenoid valve, secondary water quality monitor, secondary water quality flow meter, tertiary return water solenoid valve, tertiary water quality monitor, and tertiary water quality flow meter are all electrically connected to the control cabinet.

[0009] Furthermore, the multi-stage concentrated water purification device includes a sedimentation and filtration mechanism and a reverse osmosis membrane assembly. The sedimentation and filtration mechanism includes a first sedimentation tank, a first stirring and filtration assembly, a second sedimentation tank, and a second stirring and filtration assembly. The first sedimentation tank contains a first sedimentation chamber and a first filter chamber arranged sequentially from top to bottom. The first stirring and filtration assembly is located on the first sedimentation tank and is used to stir and filter the first mixed solution in the first sedimentation chamber and to allow the filtered first filtrate to flow into the first filter chamber. A first feed pipe communicating with the first sedimentation chamber is installed on the top of the first sedimentation tank. A concentrated water storage tank is used to supply concentrated water to the first sedimentation chamber via a concentrated water pump. The second sedimentation tank contains a second sedimentation chamber and a second filter chamber arranged sequentially from top to bottom. The stirring and filtering assembly is installed on the second sedimentation tank and is used to stir and filter the second mixed solution in the second sedimentation chamber and to allow the filtered second filtrate to flow into the second filter chamber. A second feed pipe communicating with the second sedimentation chamber is installed on the top of the second sedimentation tank. The first filter chamber is connected to the second sedimentation chamber through a first filtrate pipe and a first filtrate pump is installed on the first filtrate pipe. The second filter chamber is connected to the filtrate inlet of the reverse osmosis membrane unit through a second filtrate pipe and a second filtrate pump is installed on the second filtrate pipe. The reverse osmosis purified water outlet of the reverse osmosis membrane unit is connected to the raw water supply tank through a purified water pipe. The reverse osmosis wastewater outlet of the reverse osmosis membrane unit is connected to the wastewater storage tank through a wastewater pipe. The first filtrate pump is electrically connected to the control cabinet.

[0010] Furthermore, the second filter chamber is connected to the first sedimentation chamber through a circulation pipe. A circulation pump is installed on the circulation pipe, and a second filtrate solenoid valve is installed on the second filtrate pipe. Both the circulation pump and the second filtrate solenoid valve are electrically connected to the control cabinet.

[0011] Furthermore, the first filter chamber is equipped with a first high filtrate level sensor and a first low filtrate level sensor arranged vertically, and the second filter chamber is equipped with a second high filtrate level sensor and a second low filtrate level sensor arranged vertically. The first high filtrate level sensor, the first low filtrate level sensor, the second high filtrate level sensor, and the second low filtrate level sensor are all electrically connected to the control cabinet.

[0012] Furthermore, the first stirring and filtering assembly includes a first drive motor, a first stirring shaft, first stirring blades, and an aeration box. The first stirring shaft is rotatably mounted on the first sedimentation tank and located within the first sedimentation chamber. The first drive motor is located at the top of the first sedimentation tank and is used to drive the first stirring shaft to rotate via a first transmission component. The bottom end of the first stirring shaft extends downward and penetrates into the first filter chamber, and a first rotary sealing ring is provided between it and the first sedimentation tank. The first stirring blades are fixedly mounted on the first stirring shaft and located at the bottom of the first sedimentation chamber. There are multiple first stirring blades, evenly arranged along the circumference of the first stirring shaft. A first filter groove is provided on one side surface of the first stirring blades. A first filtrate outlet channel communicating with the first filter groove is provided at the bottom of the first stirring shaft. A matching and detachable first filter chip is installed in the first filter groove. A matching aeration box is fixedly mounted on the other side surface of the first stirring blades. An air inlet channel penetrating its top is provided inside the first stirring shaft. The top of the first stirring shaft is connected to an air supply pipe via a rotary joint. The aeration box is connected to the air inlet channel through a ventilation pipe. The aeration box has an aeration chamber inside, and the outer surface of the aeration box has several aeration holes communicating with the aeration chamber. The second stirring and filtering assembly includes a second drive motor, a second stirring shaft, and a second stirring blade. The second stirring shaft is rotatably mounted on the second sedimentation tank and located in the second sedimentation chamber. The second drive motor is located at the top of the second sedimentation tank and is used to drive the second stirring shaft to rotate through the second transmission component. The bottom end of the second stirring shaft extends downward and passes through the second filter chamber, and a second rotating sealing ring is provided between it and the second sedimentation tank. The second stirring blade is fixedly mounted on the second stirring shaft and located at the bottom of the second sedimentation chamber. There are multiple second stirring blades, which are evenly arranged along the circumference of the second stirring shaft. A second filter groove is provided in one side surface of the second stirring blade. A second filtrate outlet channel communicating with the second filter groove is provided in the bottom of the second stirring shaft. A matching and detachable second filter chip is installed in the second filter groove. The first drive motor and the second drive motor are both electrically connected to the control cabinet.

[0013] Furthermore, a first filter chip is spaced apart from the bottom surface of the first filter tank to form a first filter gap. The first filter chip includes a first stainless steel filter frame, and a first filter cotton layer and a first adsorbent layer are sequentially arranged inside the first stainless steel filter frame. A second filter chip is spaced apart from the bottom surface of the second filter tank to form a second filter gap. The second filter chip includes a second stainless steel filter frame, and a second filter cotton layer and a second adsorbent layer are sequentially arranged inside the second stainless steel filter frame.

[0014] As can be seen from the above description, the intelligent multi-stage concentrated water purification and utilization system for secondary water supply provided by the present invention has the following beneficial effects: by setting up a raw water purification device and a multi-stage concentrated water purification device, water quality purification can be provided for the secondary water supply, and the concentrated water generated in the water purification process can be purified again and recycled. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the intelligent multi-stage concentrated water purification and utilization system for secondary water supply according to the present invention.

[0016] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0017] Figure 3 for Figure 1 A magnified view of a portion of point B in the middle.

[0018] Figure 4 for Figure 1 A magnified view of a portion of point C.

[0019] Figure 5 for Figure 1 A magnified view of a portion of point D.

[0020] Figure 6 for Figure 1 A magnified view of a portion of point E in the middle.

[0021] Figure 7 for Figure 1 A magnified view of a portion of point F in the middle.

[0022] Figure 8 This is a schematic diagram of a multi-stage concentrated water purification device.

[0023] Figure 9 This is a schematic diagram of the structure of the first sedimentation tank and the first stirring and filtering assembly.

[0024] Figure 10 This is a schematic diagram of the structure of the second sedimentation tank and the second stirring and filtering assembly.

[0025] Figure 11This is a schematic diagram of the structure of the first filter chip and aeration box installed on the first stirring blade.

[0026] Figure 12 This is a schematic diagram of the structure of the second filter chip installed on the second stirring blade.

[0027] In the diagram: 1-Raw water supply tank; 21-Multi-media filter; 22-Activated carbon filter; 23-Raw water security filter; 24-Ultrafiltration membrane module; 25-High pressure pump; 26-Nanofiltration membrane module; 271-Ultrafiltration inlet solenoid valve; 272-Ultrafiltration outlet solenoid valve; 273-Primary water quality inlet solenoid valve; 274-Secondary water quality inlet solenoid valve; 275-Tertiary water quality inlet solenoid valve; 276-Ultrafiltration backwash inlet solenoid valve; 277-Ultrafiltration backwash drain solenoid valve; 27 8-Flushing solenoid valve; 279-Concentrate regulating valve; 31-Primary water quality storage tank; 311-Primary water quality pump; 312-Primary water use solenoid valve; 313-First ultraviolet sterilizer; 314-First pressure stabilizing tank; 315-Primary return water solenoid valve; 316-Primary water quality monitor; 317-Primary water quality flow meter; 318-Primary water use terminal; 32-Secondary water quality storage tank; 321-Secondary water quality pump; 322-Secondary water use solenoid valve; 323-Secondary... Ultraviolet sterilizer; 324-Second pressure stabilizing tank; 325-Secondary return water solenoid valve; 326-Secondary water quality monitor; 327-Secondary water quality flow meter; 328-Secondary water terminal; 33-Tertiary water quality storage tank; 331-Tertiary water quality pump; 332-Tertiary water solenoid valve; 333-Third ultraviolet sterilizer; 334-Third pressure stabilizing tank; 335-Tertiary return water solenoid valve; 336-Tertiary water quality monitor; 337-Tertiary water quality flow meter; 338- Three-stage water terminal; 4-Concentrated water storage tank; 51-Sedimentation and filtration mechanism; 511-First sedimentation tank; 5111-First sedimentation chamber; 5112-First filter chamber; 512-First stirring and filtering assembly; 5121-First drive motor; 5122-First stirring shaft; 51221-First filtrate outlet channel; 51222-Air inlet channel; 5123-First stirring blade; 51231-First filter tank; 5124-Aeration box; 51241-Aeration chamber;5125 - First transmission component; 5126 - First filter chip; 51261 - First stainless steel filter screen frame; 51262 - First filter cotton layer; 51263 - First adsorbent layer; 5127 - Rotary joint; 5128 - Air supply pipe; 5129 - Ventilation pipe; 513 - Second sedimentation tank; 5131 - Second sedimentation chamber; 5132 - Second filter chamber; 514 - Second stirring and filtering assembly; 5141 - Second drive motor; 5142 - Second stirring shaft; 51421 - Second filtrate outlet channel; 5143 - Second stirring blade 51431 - Second filter tank; 5144 - Second transmission component; 5145 - Second filter chip; 51451 - Second stainless steel filter screen frame; 51452 - Second filter cotton layer; 51453 - Second adsorbent layer; 515 - First feed pipe; 516 - Second feed pipe; 517 - First filtrate pump; 5181 - Second filtrate pump; 5182 - Second filtrate solenoid valve; 519 - Circulation pump; 52 - Reverse osmosis membrane module; 6 - Wastewater storage tank; 71 - Raw water pump; 72 - Raw water solenoid valve; 81 - Concentrate pump; 82 - Concentrate solenoid valve. Detailed Implementation

[0028] The present invention will be further described below through specific embodiments.

[0029] like Figures 1 to 12 As shown, the intelligent multi-stage concentrated water purification and utilization system for secondary water supply of the present invention includes a raw water supply tank 1, a raw water purification device, a pure water storage tank, a concentrated water storage tank 4, a multi-stage concentrated water purification device, and a wastewater storage tank 6. The raw water supply tank 1 supplies raw water to the raw water purification device through a raw water pump 71 and a raw water solenoid valve 72. The raw water purification device purifies the raw water and supplies the resulting pure water and concentrated water to the pure water storage tank and the concentrated water storage tank 4, respectively. The concentrated water storage tank 4 supplies concentrated water to the multi-stage concentrated water purification device through a concentrated water pump 81 and a concentrated water solenoid valve 82. The multi-stage concentrated water purification device performs multi-stage purification of the concentrated water and supplies the resulting clean water and wastewater to the raw water supply tank 1 and the wastewater storage tank 6, respectively. The raw water pump 71, the raw water solenoid valve 72, the concentrated water pump 81, and the concentrated water solenoid valve 82 are all electrically connected to the control cabinet.

[0030] By setting up the raw water purification device and the multi-stage concentrated water purification device, water quality purification can be provided for secondary water supply, and the concentrated water generated during the water purification process can be purified again and recycled.

[0031] The raw water purification device includes a multi-media filter 21, an activated carbon filter 22, a raw water security filter 23, an ultrafiltration membrane module 24, a high-pressure pump 25, and a nanofiltration membrane module 26 connected in sequence. An ultrafiltration inlet solenoid valve 271 is provided on the ultrafiltration inlet pipe between the raw water security filter 23 and the ultrafiltration inlet of the ultrafiltration membrane module 24. An ultrafiltration outlet solenoid valve 272 is provided on the ultrafiltration outlet pipe between the ultrafiltration outlet of the ultrafiltration membrane module 24 and the high-pressure pump 25. The high-pressure pump 25, the ultrafiltration inlet solenoid valve 271, and the ultrafiltration outlet solenoid valve 272 are all electrically connected to the control cabinet.

[0032] The multi-media filter 21 is used to remove suspended solids, particulate matter, and colloids from the raw water, while also reducing turbidity and color. The activated carbon filter 22 has good decolorization, residual chlorine removal, organic matter removal, organochlorine removal, ammonia nitrogen and nitrite removal, trace heavy metal ions removal, synthetic detergent and radioactive substances removal functions, and also has good deodorization function. The raw water security filter 23 can perform a second microfiltration on some small particulate suspended solids in the raw water, removing suspended solids larger than 5μm, and also intercepting activated carbon fines to protect the filter membranes of the ultrafiltration membrane group 24 and the nanofiltration membrane group 26 from clogging. The ultrafiltration membrane group 24 can remove water... The nanofiltration membrane module 26 removes most inorganic salts, organic matter, microorganisms, etc.; the nanofiltration membrane of the nanofiltration membrane module 26 has a pore size of about 1 nm and is usually made of polyamide material. It can effectively remove organic matter, color, hardness, and some dissolved salts from the water, as well as most pathogens, pollutants and other impurities. In addition, the ultrafiltration membrane module 24 uses the pressure difference across the membrane as the driving force and the ultrafiltration membrane as the filtration medium. Under a certain pressure, when the raw liquid flows through the membrane surface, the many tiny micropores on the surface of the ultrafiltration membrane only allow water and small molecules to pass through and become the permeate, while substances in the raw liquid with a volume larger than the micropore size of the membrane surface are trapped on the feed side of the membrane and become the concentrate. Thus, the purpose of purifying, separating and concentrating the raw liquid is achieved.

[0033] The pure water storage tank consists of three tanks, including a primary water quality storage tank 31, a secondary water quality storage tank 32, and a tertiary water quality storage tank 33. A primary water quality inlet solenoid valve 273 is installed on the primary water quality inlet pipe between the raw water security filter 23 and the primary water quality storage tank 31. A secondary water quality inlet solenoid valve 274 is installed on the secondary water quality inlet pipe between the ultrafiltration outlet of the ultrafiltration membrane module 24 and the secondary water quality storage tank 32. A tertiary water quality inlet solenoid valve 275 is installed on the tertiary water quality inlet pipe between the nanofiltration outlet of the nanofiltration membrane module 26 and the tertiary water quality storage tank 33. Thus, the water passes through the multi-media filter 21, the activated carbon filter 22, and the raw water security filter 23. The purification process yields Grade 1 pure water, which is then stored in the Grade 1 water storage tank 31 and can be used for cleaning and washing. After purification by the multi-media filter 21, the activated carbon filter 22, the raw water security filter 23, and the ultrafiltration membrane group 24, Grade 2 pure water is obtained and stored in the Grade 2 water storage tank 32, which can be used for washing and laundry. After purification by the multi-media filter 21, the activated carbon filter 22, the raw water security filter 23, the ultrafiltration membrane group 24, and the nanofiltration membrane group 26, Grade 3 pure water is obtained, which can be used for drinking and edible purposes. This allows users to choose different grades of pure water according to their actual needs.

[0034] An ultrafiltration backwash inlet solenoid valve 276 is provided on the ultrafiltration backwash inlet pipe between the raw water security filter 23 and the ultrafiltration membrane module 24. An ultrafiltration backwash drain solenoid valve 277 is provided on the ultrafiltration backwash drain pipe between the ultrafiltration membrane module 24 and the concentrate storage tank 4. A flushing solenoid valve 278 is provided on the nanofiltration backwash drain pipe between the nanofiltration membrane module 26 and the concentrate storage tank 4. A concentrate regulating valve 279 is also provided on the nanofiltration backwash drain pipe in parallel with the flushing solenoid valve 278. The primary water quality inlet solenoid valve 273, the secondary water quality inlet solenoid valve 274, the tertiary water quality inlet solenoid valve 275, the ultrafiltration backwash inlet solenoid valve 276, the ultrafiltration backwash drain solenoid valve 277, and the flushing solenoid valve 278 are all electrically connected to the control cabinet.

[0035] Under the control of the control cabinet, when the system is turned on or after the ultrafiltration membrane module 24 has been running for a cumulative 30 minutes, the ultrafiltration backwash inlet solenoid valve 276 and the ultrafiltration backwash outlet solenoid valve 277 can be opened, while the primary water quality inlet solenoid valve 273, the ultrafiltration inlet solenoid valve 271, and the ultrafiltration outlet solenoid valve 272 are closed. This allows water to enter from the ultrafiltration backwash inlet of the ultrafiltration membrane module 24 and flush the ultrafiltration membrane module 24. The flushed water is then discharged directly from the ultrafiltration backwash outlet of the ultrafiltration membrane module 24 into the concentrate storage tank 4. The flushing time is minutes to achieve self-cleaning. After flushing, the ultrafiltration backwash inlet solenoid valve 276, the ultrafiltration backwash outlet solenoid valve 277, and the secondary water quality inlet solenoid valve 274 are closed, while the ultrafiltration inlet solenoid valve 271 and the ultrafiltration outlet solenoid valve 272 are opened. 72. Then, the flushing solenoid valve 278 can be opened, and the water filtered by the ultrafiltration membrane module 24 will enter the nanofiltration membrane module 26 to flush the nanofiltration membrane module 26. The flushed water will bypass the nanofiltration membrane of the nanofiltration membrane module 26 and be discharged directly from the nanofiltration backwash drain of the nanofiltration membrane module 26 to the concentrate storage tank 4. The flushing time is 30 seconds to achieve self-cleaning, which can effectively remove impurities remaining on the surface of the ultrafiltration membrane module 24 and the nanofiltration membrane module 26, effectively extend the service life of the ultrafiltration membrane module 24 and the nanofiltration membrane module 26, and better ensure the water production and water quality of the water purification system. After flushing, the flushing solenoid valve 278 is closed, and after a delay of 10 seconds, and the pressure before the pump is >0.2MPa, the pressure switch is turned on, and the high-pressure pump 25 is started to pressurize the nanofiltration membrane module 26 for water filtration.

[0036] The outlet of the primary water quality storage tank 31 is connected to the primary water quality pump 311. A primary water supply solenoid valve 312, a first pressure stabilizing tank 314, and a first ultraviolet sterilizer 313 are sequentially installed on the primary water supply pipeline between the primary water quality pump 311 and the primary water terminal 318. The outlet of the secondary water quality storage tank 32 is connected to the secondary water quality pump 321. A secondary water supply solenoid valve 322, a second pressure stabilizing tank 324, and a second ultraviolet sterilizer 323 are sequentially installed on the secondary water supply pipeline between the secondary water quality pump 321 and the secondary water terminal 328. The outlet of the tertiary water quality storage tank 33 is connected to the tertiary water quality pump 331. A tertiary water supply solenoid valve 332, a third pressure stabilizing tank 334, and a third ultraviolet sterilizer 333 are sequentially installed on the tertiary water supply pipeline between the tertiary water quality pump 331 and the tertiary water terminal 338. The primary water pump 311, the primary water solenoid valve 312, the first ultraviolet sterilizer 313, the secondary water pump 321, the secondary water solenoid valve 322, the second ultraviolet sterilizer 323, the tertiary water pump 331, the tertiary water solenoid valve 332, and the third ultraviolet sterilizer 333 are all electrically connected to the control cabinet. The arrangement of the first pressure stabilizing tank 314, the second pressure stabilizing tank 324, and the third pressure stabilizing tank 334 facilitates better assurance of the water supply pressure for primary, secondary, and tertiary pure water. The arrangement of the first ultraviolet sterilizer 313, the second ultraviolet sterilizer 323, and the third ultraviolet sterilizer 333 allows for rapid sterilization, algae removal, and elimination of microorganisms and bacteria in the primary, secondary, and tertiary pure water, respectively.

[0037] A primary return water pipe is provided between the primary water pump 311 and the multi-media filter 21. A primary return water solenoid valve 315 is installed on the primary return water pipe. A primary water quality monitor 316 and a primary water quality flow meter 317 are installed on the primary water inlet pipe. A secondary return water pipe is provided between the secondary water pump 321 and the ultrafiltration inlet of the ultrafiltration membrane module 24. A secondary return water solenoid valve 325 is installed on the secondary return water pipe. A secondary water quality monitor 326 and a secondary water quality flow meter 327 are installed on the secondary water inlet pipe. A tertiary return water pipe is provided between the tertiary water pump 331 and the high-pressure pump 25. A tertiary return water solenoid valve 335 is installed on the tertiary return water pipe. A tertiary water inlet pipe is equipped with a primary water quality monitor 316 and a primary water quality flow meter 317. The system includes a primary water quality monitor 336 and a tertiary water quality flow meter 337. The primary return water solenoid valve 315, the primary water quality monitor 316, the primary water quality flow meter 317, the secondary return water solenoid valve 325, the secondary water quality monitor 326, the secondary water quality flow meter 327, the tertiary return water solenoid valve 335, the tertiary water quality monitor 336, and the tertiary water quality flow meter 337 are all electrically connected to the control cabinet. The setup of the primary, secondary, and tertiary water quality detectors facilitates the monitoring of the influent water quality of primary, secondary, and tertiary pure water respectively. This is achieved by opening the primary return water solenoid valve 315, the primary water inlet solenoid valve 273, and... The primary water solenoid valve 312, the ultrafiltration inlet solenoid valve 271, the ultrafiltration backwash inlet solenoid valve 276, and the raw water solenoid valve 72 are closed, and the primary water pump 311 is turned on. This allows the primary water quality in the primary water storage tank 31 to be drawn out and sequentially passed through the multi-media filter 21, the activated carbon filter, and the raw water security filter 23 before returning to the primary water storage tank 31. This achieves a circulating filtration and purification effect, further ensuring the quality of the primary water quality for safer use. The secondary return water solenoid valve 325 and the secondary water inlet solenoid valve 274 are opened, and the secondary water solenoid valve 322, ultrafiltration inlet solenoid valve 271, and ultrafiltration outlet solenoid valve 72 are closed. Valve 272 is activated, and the secondary water pump 321 is turned on, thereby drawing out the secondary pure water from the secondary water storage tank 32 and returning it to the secondary water storage tank 32 after passing through the ultrafiltration membrane module 24, to achieve a circulating filtration and purification effect, further ensuring the water quality of the secondary pure water for safer use. By opening the tertiary return water solenoid valve 335 and the tertiary water inlet solenoid valve 275, and closing the tertiary water outlet solenoid valve 272 and the flushing solenoid valve 278, and turning on the tertiary water pump 331, the tertiary pure water from the tertiary water storage tank 33 is drawn out and returned to the tertiary water storage tank 33 after passing through the nanofiltration membrane module 26.This achieves a circulating filtration and purification effect, further ensuring the quality of the tertiary water quality pure water, making it safer to use.

[0038] The multi-stage concentrated water purification device includes a sedimentation and filtration mechanism 51 and a reverse osmosis membrane assembly 52. ​​The sedimentation and filtration mechanism 51 includes a first sedimentation tank 511, a first stirring and filtration assembly 512, a second sedimentation tank 513, and a second stirring and filtration assembly 514.

[0039] The first sedimentation tank 511 contains a first sedimentation chamber 5111 and a first filter chamber 5112 arranged sequentially from top to bottom. The first stirring and filtering assembly 512 is mounted on the first sedimentation tank 511 and is used to stir and filter the first mixed solution in the first sedimentation chamber 5111 and to allow the filtered first filtrate to flow into the first filter chamber 5112. A first feed pipe 515 communicating with the first sedimentation chamber 5111 is installed on the top of the first sedimentation tank 511. The concentrated water storage tank 4 is used by the concentrated water pump 81 to pump concentrated water. Water is supplied to the first sedimentation chamber 5111. The first feed pipe 515 is used to introduce flocculant into the first sedimentation chamber 5111. Under the stirring action of the first stirring and filtering assembly 512, it can be fully mixed with the concentrated water in the first sedimentation chamber 5111 and combine with the organic matter in the concentrated water to precipitate, so as to play a primary purification role. At the same time, the first stirring and filtering assembly 512 can also play a filtering role during the stirring process, thereby filtering the precipitate and allowing the first filtrate after filtration to flow into the first filter chamber 5112.

[0040] The second sedimentation tank 513 has a second sedimentation chamber 5131 and a second filter chamber 5132 arranged sequentially from top to bottom. The second stirring and filtering assembly 514 is disposed on the second sedimentation tank 513 and is used to stir and filter the second mixed solution in the second sedimentation chamber 5131 and to allow the filtered second filtrate to flow into the second filter chamber 5132. A second feed pipe 516 communicating with the second sedimentation chamber 5131 is installed on the top of the second sedimentation tank 513. The first filter chamber 5112 is connected to the second sedimentation chamber 513 through a first filtrate pipe. The first filter chamber 5112 is connected to the first filter pipe, which is equipped with a first filter pump 517. The second filter chamber 5132 is connected to the filter inlet of the reverse osmosis membrane module 52 via a second filter pipe. The second filter pipe is equipped with a second filter pump 5181. The reverse osmosis purified water outlet of the reverse osmosis membrane module 52 is connected to the raw water supply tank 1 via a purified water pipe. The reverse osmosis wastewater outlet of the reverse osmosis membrane module 52 is connected to the wastewater storage tank 6 via a wastewater pipe. The first filter pump 517 is electrically connected to the control cabinet. The filtrate is pumped to the second sedimentation chamber 5131 by the first filtrate pump 517. The second feed pipe 516 introduces sodium hydroxide into the second sedimentation chamber 5131. Under the stirring action of the second stirring and filtering assembly 514, it can be fully mixed with the first filtrate in the second sedimentation chamber 5131, and combine with and precipitate the calcium and magnesium ions in the first filtrate to produce water-insoluble calcium hydroxide and magnesium hydroxide, thereby playing a secondary purification role. At the same time, the second stirring and filtering assembly 514 can also play a filtering role during the stirring process, from... The precipitate is filtered, and the filtered second filtrate flows into the second filter chamber 5132. The second filtrate in the second filter chamber 5132 is transported to the reverse osmosis membrane module 52 by the second filtrate pump 5181. After being purified and filtered by the reverse osmosis membrane module 52, a three-stage purification effect is achieved. The purified water produced by the reverse osmosis membrane module 52 is supplied to the raw water supply tank 1 for further purification by the raw water purification device and reused. The wastewater produced by the reverse osmosis membrane module 52 is supplied to the wastewater storage tank 6 for subsequent treatment.

[0041] The second filter chamber 5132 is connected to the first sedimentation chamber 5111 via a circulation pipe. A circulation pump 519 is installed on the circulation pipe, and a second filtrate solenoid valve 5182 is installed on the second filtrate pipe. Both the circulation pump 519 and the second filtrate solenoid valve 5182 are electrically connected to the control cabinet. In this way, by controlling the opening of the second filtrate solenoid valve 5182 and the activation of the circulation pump 519 through the control cabinet, the second filtrate in the second filter chamber 5132 can be pumped back into the first sedimentation chamber 5111 to achieve the function of circulation filtration and purification, so as to more fully remove organic matter, calcium ions, and magnesium ions.

[0042] In addition, the first filter chamber 5112 is provided with a first high filtrate level sensor and a first low filtrate level sensor arranged vertically in sequence, and the second filter chamber 5132 is provided with a second high filtrate level sensor and a second low filtrate level sensor arranged vertically in sequence. The first high filtrate level sensor, the first low filtrate level sensor, the second high filtrate level sensor and the second low filtrate level sensor are all electrically connected to the control cabinet.

[0043] The first stirring and filtering assembly 512 includes a first drive motor 5121, a first stirring shaft 5122, a first stirring blade 5123, and an aeration box 5124. The first stirring shaft 5122 is rotatably mounted on the first sedimentation tank 511 and located inside the first sedimentation chamber 5111. The first drive motor 5121 is located at the top of the first sedimentation tank 511 and is used to drive the first stirring shaft 5122 to rotate via a first transmission member 5125. Preferably, the first transmission member 5125 is a belt drive member. The bottom end of the first stirring shaft 5122 extends downward and penetrates into the first filter chamber 5112, and a first rotating sealing ring is provided between it and the first sedimentation tank 511. The first stirring blade 5123... The first stirring blades 5123 are fixedly installed on the first stirring shaft 5122 and located at the bottom of the first sedimentation chamber 5111. Multiple first stirring blades 5123 are evenly arranged along the circumference of the first stirring shaft 5122. A first filter groove 51231 is provided on one side surface of each first stirring blade 5123. A first filtrate outlet channel 51221 communicating with the first filter groove 51231 is provided at the bottom of the first stirring shaft 5122. A matching and detachable first filter chip 5126 is installed in the first filter groove 51231. Correspondingly, the first filter chip 5126 can be fixed to the first stirring blade 5123 by screws. The first filter chip 5126 can be disassembled for cleaning or replacement, and can be used for... The sediment at the bottom of the first sedimentation chamber 5111 is periodically cleaned. The first drive motor 5121 is electrically connected to the control cabinet, which controls the operation of the first drive motor 5121. This, in turn, drives the first stirring shaft 5122 to rotate via the first transmission component 5125, causing multiple first stirring blades 5123 to rotate as well. This effectively stirs the concentrated water in the first sedimentation chamber 5111. Simultaneously, in conjunction with the first filter chip 5126, the sediment in the concentrated water is filtered during the stirring process. The first filtrate, filtered by the first filter chip 5126, then sequentially passes through the first filter tank 51231 and... The first filtrate outlet channel 51221 flows into the first filter chamber 5112. Correspondingly, the first filter chip 5126 is disposed on the front side of the first stirring blade 5123 along its rotation direction. In this way, during the stirring of the concentrated water in the first sedimentation chamber 5111, the concentrated water will be filtered. In addition, the first stirring blade 5123 is inclined upward along its rotation direction. In this way, during the stirring process, the water flow generated during stirring can also effectively wash away some of the sediment attached to the surface of the first filter chip 5126, so as to better ensure the filtration effect of the first filter chip 5126 on the sediment. Preferably, the number of the first stirring blades 5123 is 3-5.

[0044] Furthermore, a matching aeration box 5124 is fixedly installed on the other side surface of the first stirring blade 5123. An air inlet channel 51222 extending through the top of the first stirring shaft 5122 is provided inside the shaft. The top of the first stirring shaft 5122 is connected to an air supply pipe 5128 via a rotary joint 5127. The aeration box 5124 is connected to the air inlet channel 51222 via an air vent pipe 5129. An aeration chamber 51241 is provided inside the aeration box 5124. The outer surface of the aeration box 5124 is provided with a plurality of aeration holes communicating with the aeration chamber 51241. In this way, ozone or ozone-H2O2 can be introduced into the first sedimentation chamber 5111 in sequence through the air supply pipe 5128, the air inlet channel 51222, the air passage 5129, the aeration chamber 51241, and the aeration holes to further oxidize the concentrated water in the first sedimentation chamber 5111 and further remove easily degradable organic matter in the concentrated water.

[0045] The second stirring and filtering assembly 514 includes a second drive motor 5141, a second stirring shaft 5142, and a second stirring blade 5143. The second stirring shaft 5142 is rotatably mounted on the second sedimentation tank 513 and located within the second sedimentation chamber 5131. The second drive motor 5141 is located at the top of the second sedimentation tank 513 and is used to drive the second stirring shaft 5142 to rotate via a second transmission member 5144. Preferably, the second transmission member 5144 is a belt drive member. The bottom end of the second stirring shaft 5142 extends downward and penetrates into the second filter chamber 5132, and a second rotating sealing ring is provided between it and the second sedimentation tank 513. The second stirring blade 5143 is fixedly mounted on the second stirring and filtering assembly 514. The second stirring shaft 5142 is located at the bottom of the second sedimentation chamber 5131. Multiple second stirring blades 5143 are evenly arranged along the circumference of the second stirring shaft 5142. A second filter groove 51431 is provided on one side surface of each second stirring blade 5143. A second filtrate outlet channel 51421 communicating with the second filter groove 51431 is provided at the bottom of the second stirring shaft 5142. A compatible and detachable second filter chip 5145 is installed in the second filter groove 51431. Correspondingly, the second filter chip 5145 can be fixed to the second stirring blade 5143 by screws. The second filter chip 5145 can be disassembled for cleaning or replacement, and the second sedimentation chamber 5131 can be cleaned. The sediment at the bottom of chamber 131 is periodically cleaned. The second drive motor 5141 is electrically connected to the control cabinet. The control cabinet controls the operation of the second drive motor 5141, which in turn drives the second stirring shaft 5142 to rotate via the second transmission component 5144. This causes multiple second stirring blades 5143 to rotate together, thereby fully stirring the first filtrate in the second sedimentation chamber 5131. Simultaneously, in conjunction with the second filter chip 5145, the sediment in the first filtrate is filtered during the stirring process. The second filtrate, filtered by the second filter chip 5145, then sequentially passes through the second filter tank 51431 and the second... The filtrate flows into the second filter chamber 5132 through the filtrate outlet channel 51421. Correspondingly, the second filter chip 5145 is disposed on the front side of the second stirring blade 5143 along its rotation direction. In this way, during the stirring of the first filtrate in the second sedimentation chamber 5131, the first filtrate will be filtered. In addition, the second stirring blade 5143 is inclined upward along its rotation direction. In this way, during the stirring process, the water flow generated during stirring can effectively wash away some of the sediment attached to the surface of the second filter chip 5145, so as to better ensure the filtration effect of the second filter chip 5145 on the sediment. Preferably, the number of the second stirring blades 5143 is 3-5.

[0046] A first filtration gap is formed between the first filter chip 5126 and the bottom surface of the first filter tank 51231, thereby facilitating the first filtrate after filtration by the first filter chip 5126 to enter the first filtrate outlet channel 51221 through the first filtration gap. The first filter chip 5126 includes a first stainless steel filter frame 51261, within which a first filter cotton layer 51262 and a first adsorbent layer 51263 are sequentially arranged. A second filter chip 5145 is also formed between the second filter tank 51431 and the bottom surface of the second filter tank 51431. The second filtration gap facilitates the second filtrate, after being filtered by the second filter chip 5145, to enter the second filtrate outlet channel 51421. The second filter chip 5145 includes a second stainless steel filter frame 51451, within which a second filter cotton layer 51452 and a second adsorbent layer 51453 are sequentially arranged. Furthermore, the first adsorbent layer 51263 and the second adsorbent layer 51453 are made of activated carbon, macroporous resin, or chitosan to further adsorb and remove recalcitrant organic matter in the first and second filtrates.

[0047] In addition, the raw water supply tank 1 is equipped with a raw water high level sensor and a raw water low level sensor arranged vertically; the primary water quality storage tank 31 is equipped with a primary water quality high level sensor and a primary water quality low level sensor arranged vertically; the secondary water quality storage tank 32 is equipped with a secondary water quality high level sensor and a secondary water quality low level sensor arranged vertically; the tertiary water quality storage tank 33 is equipped with a tertiary water quality high level sensor and a tertiary water quality low level sensor arranged vertically; and the concentrate storage tank 4 is equipped with a concentrate high level sensor and a concentrate low level sensor arranged vertically. The raw water high level sensor, the raw water low level sensor, the primary water quality high level sensor, the primary water quality low level sensor, the secondary water quality high level sensor, the secondary water quality low level sensor, the tertiary water quality high level sensor, the tertiary water quality low level sensor, the concentrate high level sensor, and the concentrate low level sensor are all electrically connected to the control cabinet.

[0048] In addition, a water source pressure sensor is provided between the security filter and the ultrafiltration membrane module 24, a pre-pump pressure sensor and a pressure switch are provided between the ultrafiltration membrane module 24 and the high-pressure pump 25, a pre-membrane pressure sensor is provided in front of the nanofiltration membrane module 26, a post-membrane pressure sensor is provided behind the nanofiltration membrane module 26, a first pressure sensor is provided behind the first pressure stabilizing tank 314, a second pressure sensor is provided behind the second pressure stabilizing tank 324, and a third pressure sensor is provided behind the third pressure stabilizing tank 334.

[0049] The control cabinet can be controlled by a programmable logic controller, and the operating status of the pump and valve can be controlled according to the feedback signals of signal relays such as liquid level and pressure, so as to achieve intelligent control.

[0050] The above are merely some specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. An intelligent multi-stage concentrated water purification and utilization system for secondary water supply, characterized in that: The system includes a raw water supply tank, a raw water purification device, a pure water storage tank, a concentrated water storage tank, a multi-stage concentrated water purification device, and a wastewater storage tank. The raw water supply tank supplies raw water to the raw water purification device via a raw water pump and a raw water solenoid valve. The raw water purification device purifies the raw water and supplies the resulting pure water and concentrated water to the pure water storage tank and the concentrated water storage tank, respectively. The concentrated water storage tank supplies concentrated water to the multi-stage concentrated water purification device via a concentrated water pump and a concentrated water solenoid valve. The multi-stage concentrated water purification device performs multi-stage purification of the concentrated water and supplies the resulting purified water and wastewater to the raw water supply tank and the wastewater storage tank, respectively. The raw water pump, the raw water solenoid valve, the concentrated water pump, and the concentrated water solenoid valve are all electrically connected to the control cabinet. The multi-stage concentrated water purification device includes a sedimentation and filtration mechanism and a reverse osmosis membrane assembly. The sedimentation and filtration mechanism includes a first sedimentation tank, a first stirring and filtration assembly, a second sedimentation tank, and a second stirring and filtration assembly. The first sedimentation tank contains a first sedimentation chamber and a first filter chamber arranged sequentially from top to bottom. The first stirring and filtration assembly is mounted on the first sedimentation tank and is used to stir and filter the first mixed solution in the first sedimentation chamber, allowing the filtered first filtrate to flow into the first filter chamber. A first feed pipe communicating with the first sedimentation chamber is installed on the top of the first sedimentation tank. The concentrated water storage tank supplies concentrated water to the first sedimentation chamber via the concentrated water pump. The second sedimentation tank contains a second sedimentation chamber and a second filter chamber arranged sequentially from top to bottom. The second stirring and filtration assembly... The first filter chamber is mounted on the second sedimentation tank and is used to stir and filter the second mixed solution in the second sedimentation chamber, and to allow the filtered second filtrate to flow into the second filter chamber. A second feed pipe communicating with the second sedimentation chamber is installed on the top of the second sedimentation tank. The first filter chamber is connected to the second sedimentation chamber via a first filtrate pipe, on which a first filtrate pump is installed. The second filter chamber is connected to the filtrate inlet of the reverse osmosis membrane module via a second filtrate pipe, on which a second filtrate pump is installed. The reverse osmosis purified water outlet of the reverse osmosis membrane module is connected to the raw water supply tank via a purified water pipe. The reverse osmosis wastewater outlet of the reverse osmosis membrane module is connected to the wastewater storage tank via a wastewater pipe. The first filtrate pump is electrically connected to the control cabinet.The first stirring and filtering assembly includes a first drive motor, a first stirring shaft, first stirring blades, and an aeration box. The first stirring shaft is rotatably mounted on the first sedimentation tank and located within the first sedimentation chamber. The first drive motor is located at the top of the first sedimentation tank and is used to drive the first stirring shaft to rotate via a first transmission component. The bottom end of the first stirring shaft extends downward and penetrates into the first filter chamber, and a first rotary sealing ring is provided between it and the first sedimentation tank. The first stirring blades are fixedly mounted on the first stirring shaft and located at the bottom of the first sedimentation chamber. There are multiple first stirring blades, evenly arranged along the circumference of the first stirring shaft. A first filter groove is provided on one side surface of the first stirring blades. A first filtrate outlet channel communicating with the first filter groove is provided at the bottom of the first stirring shaft. A matching and detachable first filter chip is installed in the first filter groove. A matching aeration box is fixedly mounted on the other side surface of the first stirring blades. An air inlet channel penetrating its top is provided inside the first stirring shaft. The top of the first stirring shaft is connected to an air supply pipe via a rotary joint. The aeration box is connected to... The aeration box is connected to the air inlet channel via a ventilation pipe. An aeration chamber is provided inside the aeration box, and several aeration holes communicating with the aeration chamber are provided on the outer surface of the aeration box. The second stirring and filtering assembly includes a second drive motor, a second stirring shaft, and second stirring blades. The second stirring shaft is rotatably mounted on the second sedimentation tank and located inside the second sedimentation chamber. The second drive motor is located at the top of the second sedimentation tank and is used to drive the second stirring shaft to rotate via a second transmission component. The bottom end of the second stirring shaft extends downwards and penetrates into the second filter chamber, and a second rotating sealing ring is provided between it and the second sedimentation tank. The second stirring blades are fixedly mounted on the second stirring shaft and located at the bottom of the second sedimentation chamber. Multiple second stirring blades are evenly arranged along the circumference of the second stirring shaft. A second filter groove is provided on one side surface of the second stirring blades. A second filtrate outlet channel communicating with the second filter groove is provided at the bottom of the second stirring shaft. A compatible and detachable second filter chip is installed in the second filter groove. Both the first drive motor and the second drive motor are electrically connected to the control cabinet.

2. The intelligent multi-stage concentrated water purification and utilization system for secondary water supply according to claim 1, characterized in that: The raw water purification device includes a multi-media filter, an activated carbon filter, a raw water security filter, an ultrafiltration membrane module, a high-pressure pump, and a nanofiltration membrane module connected in sequence. An ultrafiltration inlet solenoid valve is installed on the ultrafiltration inlet pipe between the raw water security filter and the ultrafiltration inlet of the ultrafiltration membrane module. An ultrafiltration outlet solenoid valve is installed on the ultrafiltration outlet pipe between the ultrafiltration outlet of the ultrafiltration membrane module and the high-pressure pump. The high-pressure pump, the ultrafiltration inlet solenoid valve, and the ultrafiltration outlet solenoid valve are all electrically connected to the control cabinet.

3. The intelligent multi-stage concentrated water purification and utilization system for secondary water supply according to claim 2, characterized in that: The pure water storage tank consists of three tanks, including a primary water quality storage tank, a secondary water quality storage tank, and a tertiary water quality storage tank. A primary water quality inlet solenoid valve is installed on the primary water quality inlet pipe between the raw water security filter and the primary water quality storage tank. A secondary water quality inlet solenoid valve is installed on the secondary water quality inlet pipe between the ultrafiltration membrane assembly's ultrafiltration outlet and the secondary water quality storage tank. A tertiary water quality inlet solenoid valve is installed on the tertiary water quality inlet pipe between the nanofiltration membrane assembly's nanofiltration outlet and the tertiary water quality storage tank. An ultrafiltration backwash inlet pipe is installed on the ultrafiltration backwash inlet pipe between the raw water security filter and the ultrafiltration membrane assembly. The system includes a backwash inlet solenoid valve, an ultrafiltration backwash drain solenoid valve on the ultrafiltration backwash drain pipe between the ultrafiltration membrane module and the concentrate storage tank, a flushing solenoid valve on the nanofiltration backwash drain pipe between the nanofiltration membrane module and the concentrate storage tank, and a concentrate regulating valve connected in parallel with the flushing solenoid valve on the nanofiltration backwash drain pipe. The primary water quality inlet solenoid valve, the secondary water quality inlet solenoid valve, the tertiary water quality inlet solenoid valve, the ultrafiltration backwash inlet solenoid valve, the ultrafiltration backwash drain solenoid valve, and the flushing solenoid valve are all electrically connected to the control cabinet.

4. The intelligent multi-stage concentrated water purification and utilization system for secondary water supply according to claim 3, characterized in that: The outlet of the primary water storage tank is connected to the primary water pump. A primary water supply solenoid valve, a first pressure stabilizing tank, and a first ultraviolet sterilizer are sequentially installed on the primary water supply pipeline between the primary water pump and the primary water terminal. The outlet of the secondary water storage tank is connected to the secondary water pump. A secondary water supply solenoid valve, a second pressure stabilizing tank, and a second ultraviolet sterilizer are sequentially installed on the secondary water supply pipeline between the secondary water pump and the secondary water terminal. The outlet of the tertiary water storage tank is connected to the tertiary water pump. A tertiary water supply solenoid valve, a third pressure stabilizing tank, and a third ultraviolet sterilizer are sequentially installed on the tertiary water supply pipeline between the tertiary water pump and the tertiary water terminal. The primary water pump, the primary water supply solenoid valve, the first ultraviolet sterilizer, the secondary water pump, the secondary water supply solenoid valve, the second ultraviolet sterilizer, the tertiary water pump, the tertiary water supply solenoid valve, and the third ultraviolet sterilizer are all electrically connected to the control cabinet.

5. The intelligent multi-stage concentrated water purification and utilization system for secondary water supply according to claim 4, characterized in that: A primary return water pipe is provided between the primary water pump and the multi-media filter. A primary return water solenoid valve is installed on the primary return water pipe. A primary water quality monitor and a primary water quality flow meter are installed on the primary water inlet pipe. A secondary return water pipe is provided between the secondary water pump and the ultrafiltration inlet of the ultrafiltration membrane module. A secondary return water solenoid valve is installed on the secondary return water pipe. A secondary water quality monitor and a secondary water quality flow meter are installed on the secondary water inlet pipe. A tertiary return water pipe is provided between the tertiary water pump and the high-pressure pump. A tertiary return water solenoid valve is installed on the tertiary return water pipe. A tertiary water quality monitor and a tertiary water quality flow meter are installed on the tertiary water inlet pipe. The primary return water solenoid valve, the primary water quality monitor, the primary water quality flow meter, the secondary return water solenoid valve, the secondary water quality monitor, the secondary water quality flow meter, the tertiary return water solenoid valve, the tertiary water quality monitor, and the tertiary water quality flow meter are all electrically connected to the control cabinet.

6. The intelligent multi-stage concentrated water purification and utilization system for secondary water supply according to claim 1, characterized in that: The second filter chamber is connected to the first sedimentation chamber through a circulation pipe. A circulation pump is installed on the circulation pipe, and a second filtrate solenoid valve is installed on the second filtrate pipe. Both the circulation pump and the second filtrate solenoid valve are electrically connected to the control cabinet.

7. The intelligent multi-stage concentrated water purification and utilization system for secondary water supply according to claim 1, characterized in that: The first filter chamber is equipped with a first high filtrate level sensor and a first low filtrate level sensor arranged vertically. The second filter chamber is equipped with a second high filtrate level sensor and a second low filtrate level sensor arranged vertically. The first high filtrate level sensor, the first low filtrate level sensor, the second high filtrate level sensor, and the second low filtrate level sensor are all electrically connected to the control cabinet.

8. The intelligent multi-stage concentrated water purification and utilization system for secondary water supply according to claim 1, characterized in that: The first filter chip is spaced apart from the bottom surface of the first filter tank and forms a first filtration gap. The first filter chip includes a first stainless steel filter frame, and a first filter cotton layer and a first adsorbent layer are sequentially arranged inside the first stainless steel filter frame. The second filter chip is spaced apart from the bottom surface of the second filter tank and forms a second filtration gap. The second filter chip includes a second stainless steel filter frame, and a second filter cotton layer and a second adsorbent layer are sequentially arranged inside the second stainless steel filter frame.

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