Hemodialysis assembly type water treatment system

Abstract

A hemodialysis assembly type water treatment system relates to the field of water treatment and comprises a first pump, a sand filter, a softener, a softening / carbon filter, a carbon filter, a security filter, a balancer, a primary reverse osmosis membrane filtering mechanism with a second pump and a secondary reverse osmosis membrane filtering mechanism with a third pump which are sequentially connected in series through pipelines, the sand filter, the softener, the softening / carbon filter and the carbon filter which are connected in series through a pipeline form a first module and are arranged in the first box frame, and the security filter and the balancer which are connected in series through a pipeline form a second module and are arranged in the second box frame; a first-stage reverse osmosis membrane filtering mechanism with a second pump and a second-stage reverse osmosis membrane filtering mechanism with a third pump, which are connected in series through a pipeline, form a third module and are arranged in a third box frame. Compared with the prior art, the invention has the advantages of thorough sterilization and disinfection and effective removal of residual disinfectant.

Description

Technical Field

[0001] The invention relates to the field of water treatment, in particular to a hemodialysis assembled water treatment system. Background Art

[0002] At present, when the hemodialysis water treatment system supplies dialysate (or dialysate concentrate) to each dialysis machine, it mainly adopts a large circulation pipeline to connect each dialysis machine in series. Due to different usage occasions, the number of dialysis machines connected in series is different. Therefore, the water treatment capacity of the hemodialysis water treatment system is different. Various components of the hemodialysis water treatment system in the prior art need to be installed on-site. Due to the different components of the hemodialysis water treatment systems with different treatment capacities and the installation environment, the same working procedures and actions cannot be used and need to be adjusted according to the site. Firstly, the workload is large. Secondly, due to the proficiency and sense of responsibility of the on-site workers, the installation quality is difficult to guarantee. Summary of the invention

[0003] The object of the present invention is to provide a hemodialysis assembled water treatment system which is easy to install and use and whose installation quality can be easily guaranteed even if the components of hemodialysis water treatment systems with different treatment capacities are different and the installation environments are different.

[0004] The hemodialysis assembled water treatment system of the present invention is implemented as follows, including a first pump, a sand filter, a softener, a softening / carbon filter, a carbon filter, a security filter, a balancer (balance water tank), a primary reverse osmosis membrane filtration mechanism with a second pump, and a secondary reverse osmosis membrane filtration mechanism with a third pump, which are sequentially connected in series through pipelines. The sand filter, the softener, the softening / carbon filter, and the carbon filter, which are serially connected in series through pipelines, form a first module and are arranged in a first box frame, a first water inlet joint is arranged to be connected to the water inlet of the sand filter, and a first water outlet joint is arranged to be connected to the water outlet of the carbon filter. The water outlet is connected, and the safety filter and the balancer connected in series through pipelines form a second module and are arranged in the second box frame. The second water inlet joint is connected to the water inlet of the safety filter, the second water outlet joint is connected to the water outlet of the balancer, and the return water joint is connected to the return water outlet of the balancer. The first-level reverse osmosis membrane filtration mechanism with a second pump and the second-level reverse osmosis membrane filtration mechanism with a third pump are connected in series through pipelines to form a third module and are arranged in the third box frame. The third water inlet joint is connected to the water inlet of the second pump, and the third water outlet joint is connected to the water outlet of the second-level reverse osmosis membrane filtration mechanism.

[0005] During production, the components constituting the assembled hemodialysis water treatment system are first installed in the corresponding boxes and racks according to the corresponding module combinations, and connected with pipelines according to the design requirements. Since they are produced in the factory, it is easy to ensure the production quality; During assembly, it is only necessary to connect the modules in series through water pipes, and then connect the third water outlet joint connected to the water outlet of the secondary reverse osmosis membrane filtration mechanism to the pre-laid transmission water pipe for serial connection of the dialysis machine, and connect the return water port of the balancer to the return water end of the pre-laid transmission water pipe for serial connection of the dialysis machine, and the installation of the hemodialysis assembled water treatment system is completed. The on-site assembly is easy and convenient, so the installation workload is small and the installation quality is easy to ensure.

[0006] Preferably, there are more than one third module. When more than two third modules are used, the third water inlet joints of each third module are connected in parallel through a water pipe and then connected to the second water outlet joint of the second module. Since the water treatment capacity of the reverse osmosis membrane filtration mechanism constituting the third module is limited, in order to meet the requirements of large water treatment capacity, multiple reverse osmosis membrane filtration mechanisms must be used to perform water treatment at the same time, and the various filters and corresponding components constituting the first module and the second module can meet the requirements of large water treatment capacity. By combining the first module and the second module that can meet the large water treatment capacity with multiple sets of third modules, a hemodialysis assembled water treatment system with large water treatment capacity can be formed.

[0007] Preferably, the first-stage reverse osmosis membrane filtration mechanism with a second pump of the third module comprises a second pump and 2-3 sets of first-stage reverse osmosis membrane filtration units; When two sets of first-level reverse osmosis membrane filtration units are used, the water inlet of the first set of first-level reverse osmosis membrane filtration units is connected to the water outlet of the second pump, the pure water outlet of the first set of first-level reverse osmosis membrane filtration units is connected to the water inlet of the third pump of the third module, the water inlet of the second set of first-level reverse osmosis membrane filtration units is connected to the wastewater outlet of the first set of first-level reverse osmosis membrane filtration units, the pure water outlet of the second set of first-level reverse osmosis membrane filtration units is connected to the water inlet of the third pump of the third module, and the wastewater outlet of the second set of first-level reverse osmosis membrane filtration units is respectively connected to the water inlet of the second pump and discharged through the regulating valve; When three sets of first-level reverse osmosis membrane filtration units are used, the water inlet of the first set of first-level reverse osmosis membrane filtration units is connected to the water outlet of the second pump, the pure water outlet of the first set of first-level reverse osmosis membrane filtration units is connected to the water inlet of the third pump of the third module, the water inlet of the second set of first-level reverse osmosis membrane filtration units is connected to the wastewater outlet of the first set of first-level reverse osmosis membrane filtration units, the pure water outlet of the second set of first-level reverse osmosis membrane filtration units is connected to the water inlet of the third pump of the third module, the wastewater outlet of the second set of first-level reverse osmosis membrane filtration units is connected to the water inlet of the third set of first-level reverse osmosis membrane filtration units, the pure water outlet of the third set of first-level reverse osmosis membrane filtration units is connected to the water inlet of the third pump of the third module, and the wastewater outlet of the third set of first-level reverse osmosis membrane filtration units is respectively connected to the water inlet of the second pump and discharged through the regulating valve.

[0008] 2-3 sets of first-stage reverse osmosis membrane filtration units are used. The latter set of first-stage reverse osmosis membrane filtration units treats the wastewater from the former set of first-stage reverse osmosis membrane filtration units into first-stage pure water. This can fully utilize water resources and the pre-treated water treatment capacity, and can significantly increase the output of first-stage pure water.

[0009] Preferably, the secondary reverse osmosis membrane filtration mechanism with a third pump of the third module comprises a third pump and 1-2 sets of secondary reverse osmosis membrane filtration units; When one set of two-stage reverse osmosis membrane filtration unit is used, the water inlet of the two-stage reverse osmosis membrane filtration unit is connected to the water outlet of the third pump, the pure water outlet of the two-stage reverse osmosis membrane filtration unit outputs ultrapure water, and the waste water of the two-stage reverse osmosis membrane filtration unit is connected to the water inlet of the third pump; When two sets of secondary reverse osmosis membrane filtration units are used, the water inlet of the first set of secondary reverse osmosis membrane filtration units is connected to the water outlet of the third pump, the pure water outlet of the first set of secondary reverse osmosis membrane filtration units outputs ultrapure water, the water inlet of the second set of secondary reverse osmosis membrane filtration units is connected to the wastewater outlet of the first set of secondary reverse osmosis membrane filtration units, the pure water outlet of the second set of secondary reverse osmosis membrane filtration units outputs ultrapure water, and the wastewater outlet of the second set of secondary reverse osmosis membrane filtration units is connected to the water inlet of the third pump.

[0010] Since the water entering the secondary reverse osmosis membrane filtration unit has been filtered by the primary reverse osmosis membrane filtration unit, it is already pure water. The wastewater from the secondary reverse osmosis membrane filtration unit has high purity and does not need to be discharged, so as to save water resources; Two sets of two-stage reverse osmosis membrane filtration units are used, and the second set of two-stage reverse osmosis membrane filtration units treats the wastewater of the first set of two-stage reverse osmosis membrane filtration units into ultrapure water, which can fully utilize water resources and pre-treated water treatment capacity, and can significantly increase the output of ultrapure water. Compared with the existing technology, the present invention has the advantages of thorough sterilization and disinfection, and can effectively remove residual disinfectants. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of a hemodialysis assembled water treatment system according to Example 1 of the present invention; Figure 2 This is a schematic structural diagram of a hemodialysis assembled water treatment system according to Embodiment 2 of the present invention; Figure 3 This is a schematic structural diagram of a hemodialysis assembled water treatment system according to Embodiment 3 of the present invention; Figure 4 This is a schematic diagram of the structure of the hemodialysis assembled water treatment system according to Example 4 of the present invention.

[0012] Explanation of the reference numerals: A-first module; B-second module; C-second module; D-dialysis machine; 1-pipeline; 2-first pump; 3-sand filter; 4-softener; 5-softening / carbon filter; 6-carbon filter; 7-security filter; 8-balancer; 9-second pump; 10-first-stage reverse osmosis membrane filtration mechanism; 1001-first-stage reverse osmosis membrane filtration unit; 1002-regulating valve; 11-third pump; 12-second-stage reverse osmosis membrane filtration mechanism; 1201-second-stage reverse osmosis membrane filtration unit; 1202-drain valve; 13-first water inlet connector; 14-first water outlet connector; 15-second water inlet connector; 16-second water outlet connector; 17-return water connector; 18-third water inlet connector; 19-third water outlet connector; 20-transmission water pipe. DETAILED DESCRIPTION

[0013] The assembled water treatment system for hemodialysis of the present invention is now described in further detail with reference to the accompanying drawings and embodiments: Example 1: Figure 1 As shown, the hemodialysis assembled water treatment system of the present invention is implemented as follows, including a first pump 2, a sand filter 3, a softener 4, a softening / carbon filter 5, a carbon filter 6, a security filter 7, a balancer 8 (balance water tank), a primary reverse osmosis membrane filtration mechanism 10 with a second pump 9, and a secondary reverse osmosis membrane filtration mechanism 12 with a third pump 11, which are connected in series through a pipeline 1. The sand filter 3, the softener 4, the softening / carbon filter 5 and the carbon filter 6 connected in series through the pipeline 1 form a first module A and are arranged in a first box frame. The balancer 8 is provided with a discharge port with a discharge valve, a first water inlet joint 13 is provided to communicate with the water inlet of the sand filter 3, and a first water outlet joint 1 is provided. 4 is connected with the water outlet of the carbon filter 6, the security filter 7 and the balancer 8 connected in series through the pipeline 1 constitute the second module B and are arranged in the second box frame, the second water inlet joint 15 is arranged to be connected with the water inlet of the security filter 7, the second water outlet joint 16 is arranged to be connected with the water outlet of the balancer 8, the return water joint 17 is arranged to be connected with the return water outlet of the balancer 8, the first-level reverse osmosis membrane filtering mechanism 10 with the second pump 9 and the second-level reverse osmosis membrane filtering mechanism 12 with the third pump 11 connected in series through the pipeline 1 constitute the third module C and are arranged in the third box frame, the third water inlet joint 18 is arranged to be connected with the water inlet of the second pump 9, and the third water outlet joint 19 is arranged to be connected with the water outlet of the second-level reverse osmosis membrane filtering mechanism 12.

[0014] The third module C has one set.

[0015] Preferably, the first-stage reverse osmosis membrane filtration mechanism 10 with the second pump 9 of the third module C comprises the second pump 9 and two sets of first-stage reverse osmosis membrane filtration units 1001; The water inlet of the first set of first-level reverse osmosis membrane filtration units 1001 is connected to the water outlet of the second pump 9, the pure water outlet of the first set of first-level reverse osmosis membrane filtration units 1001 is connected to the water inlet of the third pump 11 of the third module C, the water inlet of the second set of first-level reverse osmosis membrane filtration units 1001 is connected to the wastewater outlet of the first set of first-level reverse osmosis membrane filtration units 1001, the pure water outlet of the second set of first-level reverse osmosis membrane filtration units 1001 is connected to the water inlet of the third pump 11 of the third module C, and the wastewater outlet of the second set of first-level reverse osmosis membrane filtration units 1001 is respectively connected to the water inlet of the second pump 9 and discharged through the regulating valve 1002; Preferably, the secondary reverse osmosis membrane filtration mechanism 12 with the third pump 11 of the third module comprises the third pump 11 and a set of secondary reverse osmosis membrane filtration units 1201; The water inlet of the secondary reverse osmosis membrane filtration unit 1201 is connected to the water outlet of the third pump 11 , the pure water outlet of the secondary reverse osmosis membrane filtration unit 1201 outputs ultrapure water, and the wastewater outlet of the secondary reverse osmosis membrane filtration unit 1201 is connected to the water inlet of the third pump 11 .

[0016] The wastewater outlet of the secondary reverse osmosis membrane filtration unit 1201 is connected to the drain port through the drain valve 1202 .

[0017] During production, the components constituting the assembled water treatment system for hemodialysis are first installed in the corresponding box frame according to the corresponding module combination, and connected with the pipeline 1 according to the design requirements. Since it is produced in the factory, it is easy to ensure the production quality; During assembly, it is only necessary to connect the modules in series through soft water pipes, and then connect the third water outlet joint 19 connected to the water outlet of the secondary reverse osmosis membrane filtration mechanism 12 to the pre-laid transmission water pipe 20 for serial connection of the dialysis machine D, and the return water joint 17 of the return water port of the balancer 8 to the return water end of the pre-laid transmission water pipe 20 for serial connection of the dialysis machine D. The installation of the hemodialysis assembled water treatment system is completed, and the on-site assembly is easy and convenient, so the installation workload is small and the installation quality is easy to ensure.

[0018] The first module A of this embodiment cooperates with the second module B using matching filter materials and balancer capacity to produce 2.7 tons of filtered water; The first-stage reverse osmosis membrane filtration mechanism 10 of the third module C of this embodiment can produce 2 tons / hour of pure water; The secondary reverse osmosis membrane filtration mechanism 12 of the third module C of this embodiment can produce 1 ton / hour of ultrapure water.

[0019] When disinfecting the system; By turning off the second pump 9 and the third pump 11 and fully opening the regulating valve 1002, the first module and the second module B outside the primary reverse osmosis membrane filtration mechanism 10 with the second pump 9 and the secondary reverse osmosis membrane filtration mechanism 12 with the third pump 11 can be disinfected with disinfectant; By turning on the second pump 9 and the third pump 11, and fully opening the regulating valve 1002 and the drain valve 1202, the first module A, the second module B and the third module C can be sterilized with high-temperature hot water.

[0020] Example 2: Figure 2 As shown, this embodiment is based on the embodiment 1, and the first-stage reverse osmosis membrane filtration mechanism with the second pump of the third module includes the second pump 9 and 3 sets of first-stage reverse osmosis membrane filtration units 1001; The water inlet of the first set of first-level reverse osmosis membrane filtration unit 1001 is connected to the water outlet of the second pump 9, the pure water outlet of the first set of first-level reverse osmosis membrane filtration unit 1001 is connected to the water inlet of the third pump 11 of the third module C, the water inlet of the second set of first-level reverse osmosis membrane filtration unit 1001 is connected to the wastewater outlet of the first set of first-level reverse osmosis membrane filtration unit 1001, the pure water outlet of the second set of first-level reverse osmosis membrane filtration unit 1001 is connected to the water inlet of the third pump 11 of the third module C, the wastewater outlet of the second set of first-level reverse osmosis membrane filtration unit 1001 is connected to the water inlet of the third set of first-level reverse osmosis membrane filtration unit 1001, the pure water outlet of the third set of first-level reverse osmosis membrane filtration unit 1001 is connected to the water inlet of the third pump 11 of the third module C, and the wastewater outlet of the third set of first-level reverse osmosis membrane filtration unit 1001 is respectively connected to the water inlet of the second pump 9 and discharged through the regulating valve 1002. The secondary reverse osmosis membrane filtration mechanism 12 with the third pump 11 of the third module C includes the third pump 11 and two sets of secondary reverse osmosis membrane filtration units 1201; The water inlet of the first set of secondary reverse osmosis membrane filtration units 1201 is connected to the water outlet of the third pump 11, the pure water outlet of the first set of secondary reverse osmosis membrane filtration units 1201 outputs ultrapure water, the water inlet of the second set of secondary reverse osmosis membrane filtration units 1201 is connected to the wastewater outlet of the first set of secondary reverse osmosis membrane filtration units 1201, the pure water outlet of the second set of secondary reverse osmosis membrane filtration units 1201 outputs ultrapure water, and the wastewater outlet of the second set of secondary reverse osmosis membrane filtration units 1201 is connected to the water inlet of the third pump 11.

[0021] The wastewater outlet of the second set of secondary reverse osmosis membrane filtration unit 1201 is connected to the drain port through the drain valve 1202 .

[0022] The first module A of this embodiment cooperates with the second module B using matching filter materials and balancer capacity to produce 4 tons of filtered water; The first-stage reverse osmosis membrane filtration mechanism 10 of the third module C of this embodiment can produce 3 tons / hour of pure water; The secondary reverse osmosis membrane filtration mechanism 12 of the third module C of this embodiment can produce 2 tons / hour of ultrapure water.

[0023] When disinfecting the system; By turning off the second pump 9 and the third pump 11 and fully opening the regulating valve 1002, the first module and the second module B outside the primary reverse osmosis membrane filtration mechanism 10 with the second pump 9 and the secondary reverse osmosis membrane filtration mechanism 12 with the third pump 11 can be disinfected with disinfectant; By turning on the second pump 9 and the third pump 11, and fully opening the regulating valve 1002 and the drain valve 1202, the first module A, the second module B and the third module C can be sterilized with high-temperature hot water.

[0024] Embodiment 3, as Figure 3 As shown, this embodiment is based on embodiments 1 and 2, and there are two sets of third modules C.

[0025] The first module A of this embodiment cooperates with the second module B using matching filter materials and balancer capacity to produce 6.7 tons of filtered water; The first-stage reverse osmosis membrane filtration mechanism 10 of one set of the third module C can produce 2 tons / hour of pure water, and the second-stage reverse osmosis membrane filtration mechanism 12 can produce 1 ton / hour of ultrapure water; The first-stage reverse osmosis membrane filtration mechanism 10 of another set of third modules C can produce 3 tons / hour of pure water, and the second-stage reverse osmosis membrane filtration mechanism 12 can produce 2 tons / hour of ultrapure water.

[0026] During assembly, the first module A is connected in series with the second module B through a soft water pipe, the second module B is connected in series with two sets of third modules C in parallel through a three-way soft water pipe, the soft water pipe is connected to the third water outlet connector 19 of the water outlet of the secondary reverse osmosis membrane filtration mechanism 12 of the two sets of third modules C, and then, after the three-way connection, it is connected to the pre-arranged transmission water pipe 20 for serial connection of the dialysis machine D, and the return water connector 17 of the return water outlet of the balancer 8 is connected to the return water end of the pre-arranged transmission water pipe 20 for serial connection of the dialysis machine D, and the installation of the hemodialysis assembled water treatment system is completed.

[0027] After installation, the hemodialysis assembled water treatment system of this embodiment can produce 3 tons / hour of ultrapure water.

[0028] Embodiment 4, as Figure 4 As shown, this embodiment is based on embodiments 1 and 2, and there are two sets of third modules C.

[0029] The first module A of this embodiment cooperates with the second module B using matching filter materials and balancer capacity to produce 8 tons of filtered water; The first-stage reverse osmosis membrane filtration mechanism 10 of the two sets of third modules C can produce 3 tons / hour of pure water, and the second-stage reverse osmosis membrane filtration mechanism 12 can produce 2 tons / hour of ultrapure water.

[0030] During assembly, the first module A is connected in series with the second module B through a soft water pipe, the second module B is connected in series with two sets of third modules C in parallel through a three-way soft water pipe, the soft water pipe is connected to the third water outlet connector 19 of the water outlet of the secondary reverse osmosis membrane filtration mechanism 12 of the two sets of third modules C, and then, after the three-way connection, it is connected to the pre-arranged transmission water pipe 20 for serial connection of the dialysis machine D, and the return water connector 17 of the return water outlet of the balancer 8 is connected to the return water end of the pre-arranged transmission water pipe 20 for serial connection of the dialysis machine D, and the installation of the hemodialysis assembled water treatment system is completed.

[0031] After installation, the hemodialysis assembled water treatment system of this embodiment can produce 43 tons / hour of ultrapure water.

Claims

1. A hemodialysis assembled water treatment system, comprising a first pump, a sand filter, a softener, a softening / carbon filter, a carbon filter, a security filter, a balancer (balance water tank), a primary reverse osmosis membrane filter mechanism with a second pump, and a secondary reverse osmosis membrane filter mechanism with a third pump, which are sequentially connected in series through pipelines. The sand filter, the softener, the softening / carbon filter, and the carbon filter, which are serially connected through pipelines, form a first module and are arranged in a first box frame. A first water inlet joint is arranged to communicate with a water inlet of the sand filter, and a first water outlet joint is arranged to communicate with a water outlet of the carbon filter. The first reverse osmosis membrane filtration mechanism with a second pump and the second reverse osmosis membrane filtration mechanism with a third pump are connected in series through pipelines to form a third module and are arranged in a third box frame, the third water inlet joint is connected to the water inlet of the second pump, and the third water outlet joint is connected to the water outlet of the second reverse osmosis membrane filtration mechanism; First, the components constituting the hemodialysis assembled water treatment system are installed in the corresponding boxes and racks according to the corresponding module combinations, and connected with pipes according to the design requirements; During assembly, the modules are connected in series through water pipes, and then the third water outlet joint connected to the water outlet of the secondary reverse osmosis membrane filtration mechanism is connected to the pre-laid transmission water pipe for serially connecting the dialysis machine, and the return water port of the balancer is connected to the return water end of the pre-laid transmission water pipe for serially connecting the dialysis machine, and the installation of the hemodialysis assembled water treatment system is completed.

2. The hemodialysis assembled water treatment system according to claim 1, characterized in that: When there are more than one third module set and more than two third modules are used, the third water inlet joints of each third module set are connected in parallel through a water pipe and then connected to the second water outlet joint of the second module set.

3. The hemodialysis assembled water treatment system according to claim 1 or 2, characterized in that: The first-stage reverse osmosis membrane filtration mechanism with a second pump of the third module includes a second pump and 2-3 sets of first-stage reverse osmosis membrane filtration units; When two sets of first-level reverse osmosis membrane filtration units are used, the water inlet of the first set of first-level reverse osmosis membrane filtration units is connected to the water outlet of the second pump, the pure water outlet of the first set of first-level reverse osmosis membrane filtration units is connected to the water inlet of the third pump of the third module, the water inlet of the second set of first-level reverse osmosis membrane filtration units is connected to the wastewater outlet of the first set of first-level reverse osmosis membrane filtration units, the pure water outlet of the second set of first-level reverse osmosis membrane filtration units is connected to the water inlet of the third pump of the third module, and the wastewater outlet of the second set of first-level reverse osmosis membrane filtration units is respectively connected to the water inlet of the second pump and discharged through the regulating valve; When three sets of first-level reverse osmosis membrane filtration units are used, the water inlet of the first set of first-level reverse osmosis membrane filtration units is connected to the water outlet of the second pump, the pure water outlet of the first set of first-level reverse osmosis membrane filtration units is connected to the water inlet of the third pump of the third module, the water inlet of the second set of first-level reverse osmosis membrane filtration units is connected to the wastewater outlet of the first set of first-level reverse osmosis membrane filtration units, the pure water outlet of the second set of first-level reverse osmosis membrane filtration units is connected to the water inlet of the third pump of the third module, the wastewater outlet of the second set of first-level reverse osmosis membrane filtration units is connected to the water inlet of the third set of first-level reverse osmosis membrane filtration units, the pure water outlet of the third set of first-level reverse osmosis membrane filtration units is connected to the water inlet of the third pump of the third module, and the wastewater outlet of the third set of first-level reverse osmosis membrane filtration units is respectively connected to the water inlet of the second pump and discharged through the regulating valve.

4. The hemodialysis assembled water treatment system according to claim 3, characterized in that: The secondary reverse osmosis membrane filtration mechanism with a third pump of the third module comprises a third pump and 1-2 sets of secondary reverse osmosis membrane filtration units; When one set of two-stage reverse osmosis membrane filtration unit is used, the water inlet of the two-stage reverse osmosis membrane filtration unit is connected to the water outlet of the third pump, the pure water outlet of the two-stage reverse osmosis membrane filtration unit outputs ultrapure water, and the waste water of the two-stage reverse osmosis membrane filtration unit is connected to the water inlet of the third pump; When two sets of secondary reverse osmosis membrane filtration units are used, the water inlet of the first set of secondary reverse osmosis membrane filtration units is connected to the water outlet of the third pump, the pure water outlet of the first set of secondary reverse osmosis membrane filtration units outputs ultrapure water, the water inlet of the second set of secondary reverse osmosis membrane filtration units is connected to the wastewater outlet of the first set of secondary reverse osmosis membrane filtration units, the pure water outlet of the second set of secondary reverse osmosis membrane filtration units outputs ultrapure water, and the wastewater outlet of the second set of secondary reverse osmosis membrane filtration units is connected to the water inlet of the third pump.

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