A method, system and water treatment device for producing ultrapure water

Abstract

The application relates to the technical field of ultrapure water preparation, and discloses an ultrapure water preparation method, system, water treatment equipment and readable storage medium. The method sequentially processes the water to be treated through a filter module in a first-stage treatment module, a reverse osmosis module and a boron removal module in a second-stage treatment module, and a boron removal device in a third-stage treatment module to obtain ultrapure water. Meanwhile, concentrated water generated by the second-stage treatment module is stored in a first-stage water tank and processed through the second-stage treatment module, and ultrapure water that is not used in a water use point is stored in a second-stage water tank. Compared with boron removal through only a reverse osmosis technology, the two-stage boron removal modules added after the reverse osmosis module improve the boron removal effect on the water to be treated, meet the industry requirements, and the water resources that are processed but cannot be used are re-entered into the water treatment cycle from the second-stage treatment module and the water use point, the step of water treatment of part of the water resources is reduced, and the water treatment efficiency is improved, so that the preparation effect of the ultrapure water is improved from two aspects.

Description

Technical Field

[0001] This invention relates to the field of ultrapure water preparation technology, and in particular to an ultrapure water preparation method, system, water treatment equipment, and readable storage medium. Background Technology

[0002] Currently, with the continuous development of science and technology, ultrapure water containing very few impurities, ions, and organic matter is used in various fields, and increasingly higher requirements are being placed on its quality. Boron, the only non-metallic element in Group 3 of the periodic table, is particularly important. Because boron atoms have fewer valence electrons than valence orbitals, they are electron-deficient. However, compared to lithium and beryllium, which are also in the same period, boron has a smaller atomic radius, higher ionization energy, and greater electronegativity, and is characterized by forming covalently bonded molecules. In ultrapure water production systems, boron removal mainly relies on reverse osmosis units. However, at low pH levels, such as pH=9, chemical cleaning leads to a significant decrease in boron removal efficiency. Boron, existing in the form of boric acid, is removed through the reverse osmosis membrane with a removal rate of only about 80%, which is relatively poor.

[0003] It is evident that ultrapure water produced solely through boron removal via reverse osmosis units is insufficient to meet the ultrapure water requirements of some industries. Summary of the Invention

[0004] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0005] In view of the shortcomings of the prior art described above, the present invention discloses an ultrapure water preparation method, system, water treatment equipment, and readable storage medium to improve the preparation effect of ultrapure water.

[0006] This invention discloses a method for preparing ultrapure water, comprising: setting up an ultrapure water preparation system located between a raw water tank and a point of use, wherein the ultrapure water preparation system includes a primary treatment module, a primary water tank, a secondary treatment module, a secondary water tank, and a tertiary treatment module connected in sequence; subjecting the raw water to be treated in the raw water tank to a first-stage treatment through the primary treatment module, and storing the first-stage treated water in the primary water tank, wherein the primary treatment module consists of a filter device; subjecting the first-stage treated water to a second-stage treatment through the secondary treatment module, storing the desalinated water obtained from the second-stage treatment as secondary-stage treated water in the secondary water tank, and storing the concentrated water produced from the second-stage treatment as primary-stage treated water in the primary water tank, wherein the secondary treatment module consists of a reverse osmosis device and a boron removal device; subjecting the secondary-stage treated water to a third-stage treatment through the tertiary treatment module to obtain ultrapure water, wherein the tertiary treatment module consists of a boron removal device, the point of use is used to use the ultrapure water, and unused ultrapure water is stored in the secondary water tank.

[0007] This invention discloses an ultrapure water preparation system, comprising: a raw water tank connected to a primary treatment module; the primary treatment module, consisting of a filter device, is used to perform a first-stage treatment on the water to be treated in the raw water tank, and to store the first-stage treated water in the primary water tank; the primary water tank has its inlet connected to the primary treatment module and its outlet connected to a secondary treatment module; the secondary treatment module, consisting of a reverse osmosis device and a boron removal device, is used to perform a second-stage treatment on the first-stage treated water, and to store the second-stage treated water in the primary water tank. The freshwater obtained is stored as secondary treated water in the secondary water tank, and the concentrated water produced in the second stage of treatment is stored as primary treated water in the primary water tank. The inlet of the secondary water tank is connected to the secondary treatment module, and the outlet of the secondary water tank is connected to the tertiary treatment module. The tertiary treatment module consists of a boron removal device and is used to perform a third stage of treatment on the secondary treated water to obtain ultrapure water. The inlet of the point of use is connected to the tertiary treatment module, and the point of use is used to use the ultrapure water, while unused ultrapure water is stored in the secondary water tank.

[0008] The present invention discloses a water treatment device, comprising: a processor and a memory; the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory to cause the water treatment device to perform the above-described method.

[0009] The beneficial effects of this invention are:

[0010] The water to be treated is sequentially processed through a filter module in the primary treatment module, a reverse osmosis module and a boron removal module in the secondary treatment module, and a boron removal device in the tertiary treatment module to obtain ultrapure water. Simultaneously, the concentrated water produced by the secondary treatment module is stored in the primary water tank and processed again in the secondary treatment module. Unused ultrapure water at the point of use is stored in the secondary water tank. In this way, compared to boron removal using only reverse osmosis technology, adding two boron removal modules after the reverse osmosis module improves the boron removal efficiency of the water to be treated, meeting industry requirements. Furthermore, treated but unusable water from the secondary treatment module and the point of use is reintroduced into the water treatment cycle, reducing the number of water resources undergoing further treatment steps and improving water treatment efficiency. Therefore, the production effect of ultrapure water is improved in two ways. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the application environment for implementing an ultrapure water preparation method in an embodiment of the present invention;

[0012] Figure 2 This is a schematic diagram of the structure of an ultrapure water preparation system in an embodiment of the present invention;

[0013] Figure 3 This is a schematic flowchart of an ultrapure water preparation method according to an embodiment of the present invention;

[0014] Figure 4 This is a schematic diagram of another ultrapure water preparation system in an embodiment of the present invention;

[0015] Figure 5 This is a schematic diagram of the structure of a water treatment device in an embodiment of the present invention. Detailed Implementation

[0016] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and sub-samples in the embodiments can be combined with each other.

[0017] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0018] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0019] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0020] Unless otherwise stated, the term "multiple" means two or more.

[0021] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0022] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0023] Combination Figure 1 As shown, this embodiment of the present disclosure provides an application environment for implementing an ultrapure water preparation method, including a raw water tank 101, a primary treatment module 102, a primary water tank 103, a secondary treatment module 104, a secondary water tank 105, a tertiary treatment module 106, and a water usage point 107.

[0024] The outlet of the raw water tank 101 is connected to the inlet of the primary treatment module 102. The raw water tank 101 is used to store water to be treated.

[0025] The outlet of the primary treatment module 102 is connected to the inlet of the primary water tank 103. The primary treatment module 102 is composed of a filter device. The primary treatment module 102 is used to perform the first-stage treatment on the water to be treated in the raw water tank to obtain primary treated water.

[0026] The outlet of the primary water tank 103 is connected to the inlet of the secondary treatment module 104. The primary water tank 103 is used to store the primary treated water.

[0027] The freshwater outlet of the secondary treatment module 104 is connected to the inlet of the second water tank, and the concentrated water outlet of the secondary treatment module 104 is connected to the inlet of the primary water tank. The secondary treatment module 104 consists of a reverse osmosis device and a boron removal device. The secondary treatment module 104 is used to perform a second stage of treatment on the primary treated water, and the freshwater obtained from the second stage treatment is used as the secondary treated water.

[0028] The outlet of the secondary water tank 105 is connected to the inlet of the tertiary treatment module 106. The secondary water tank 105 is used to store the secondary treated water.

[0029] The outlet of the tertiary treatment module 106 is connected to the inlet of the water point 107. The tertiary treatment module 106 consists of a boron removal device and is used to perform tertiary treatment on the secondary treated water to obtain ultrapure water.

[0030] Point 107 is used to supply ultrapure water, and unused ultrapure water is stored in the secondary water tank.

[0031] Combination Figure 2 As shown, this embodiment of the present disclosure provides an ultrapure water preparation system, including a primary treatment module 102, a primary water tank 103, a secondary treatment module 104, a secondary water tank 105, and a tertiary treatment module 106.

[0032] Optionally, the primary treatment module 102 includes one or more of a mechanical filter, an activated carbon filter, a softening filter, and a precision filter. For example, the primary treatment module 102 includes a raw water pump, a mechanical filter, an activated carbon filter, a softening filter, and a precision filter connected in sequence.

[0033] In some embodiments, the mechanical filter is used to remove mechanical impurities, colloids, microorganisms, organic matter and activated chlorine, etc., and its filter medium is quartz sand, activated carbon, manganese sand, anthracite, etc.

[0034] In some embodiments, the filter medium of the activated carbon filter comprises black porous particles made from a variety of raw materials such as bituminous coal, lignite, nutshells, or sawdust through a carbonization and activation process. These particles have a large specific surface area and the ability to selectively adsorb impurities, rather than mechanically "filtering" impurities.

[0035] In some embodiments, a softening filter is used to adsorb calcium and magnesium ions in water, thereby reducing the hardness of the raw water.

[0036] In some embodiments, the precision filter uses tubular filter elements such as PP melt-blown, wire-burned, pleated, titanium filter elements, and activated carbon filter elements as filter elements. Different filter elements are selected according to different filter media and design processes to meet the requirements of effluent water quality.

[0037] Optionally, the secondary treatment module 104 includes one or more reverse osmosis units, TOC (Total Organic Carbon) removal units, boron removal units, and EDI (Electrode Ionization) units connected in sequence. For example, the secondary treatment module 104 includes a primary reverse osmosis unit, a secondary reverse osmosis unit, a primary TOC removal unit, a primary boron removal unit, and an EDI unit connected in sequence.

[0038] In some embodiments, the EDI device is used to purify water, converting pure water into ultrapure water.

[0039] In some embodiments, the concentrated water from the primary reverse osmosis unit is stored in the primary water tank as concentrated water produced by the secondary treatment module.

[0040] In some embodiments, the concentrated water from the secondary reverse osmosis unit is stored in the primary water tank as concentrated water produced by the secondary treatment module.

[0041] In some embodiments, the concentrated water from the EDI device is stored in a primary water tank as concentrated water produced by a secondary treatment module.

[0042] Optionally, the secondary water tank 105 includes a nitrogen-sealed water tank, wherein the nitrogen-sealed water tank consists of an inner water storage layer and an outer insulation layer. The water storage layer is used to store secondary treated water, and the insulation layer is used to control the water temperature of the secondary treated water at the optimal operating temperature of the tertiary treatment module.

[0043] Optionally, the three-stage treatment module 106 includes a TOC removal device, a boron removal device, one or more polishing mixed beds, a sterilization device, and an ultrafiltration device connected in sequence. For example, the three-stage treatment module includes a booster pump, a secondary TOC removal device, a secondary boron removal device, a primary polishing mixed bed, a secondary polishing mixed bed, a UV (Ultraviolet Disinfection) sterilization device, and an ultrafiltration device connected in sequence.

[0044] In some embodiments, a polishing mixed bed is used to mix anions and cations in the same exchange vessel and achieve effective adsorption of water molecules through a multi-level staggered arrangement.

[0045] In some embodiments, the UV sterilization device utilizes ultraviolet light of appropriate wavelengths to destroy the molecular structure of DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) in microbial cells, causing vegetative cell death and / or regenerative cell death, thereby achieving the effect of sterilization and disinfection.

[0046] In some embodiments, an ultrafiltration device is used to allow small molecule solutes and solvents to pass through a specially designed membrane with a certain pore size under a certain pressure, while large molecule solutes cannot pass through and remain on one side of the membrane, thereby partially purifying the large molecules.

[0047] Combination Figure 3 As shown in the embodiments of this disclosure, a method for preparing ultrapure water is provided, comprising:

[0048] Step S301: Set up an ultrapure water preparation system located between the raw water tank and the point of use;

[0049] The ultrapure water preparation system includes a primary treatment module, a primary water tank, a secondary treatment module, a secondary water tank, and a tertiary treatment module connected in sequence.

[0050] Step S302: The water to be treated in the raw water tank is processed through the primary treatment module for the first stage of treatment, and the treated water obtained from the first stage of treatment is stored in the primary water tank.

[0051] The primary processing module consists of a filter device;

[0052] Step S303: The primary treated water is processed through the secondary treatment module for secondary treatment. The fresh water obtained from the secondary treatment is stored in the secondary water tank as secondary treated water, and the concentrated water produced from the secondary treatment is stored in the primary water tank as primary treated water.

[0053] The secondary processing module consists of a reverse osmosis unit and a boron removal unit;

[0054] Step S304: The secondary treated water is passed through the tertiary treatment module for tertiary treatment to obtain ultrapure water;

[0055] The three-stage processing module consists of a boron removal device;

[0056] The water point is used to supply ultrapure water, and any unused ultrapure water is stored in the secondary water tank.

[0057] This disclosure provides a method for preparing ultrapure water. The method sequentially treats the water to be treated through a filter module in a primary treatment module, a reverse osmosis module and a boron removal module in a secondary treatment module, and a boron removal device in a tertiary treatment module to obtain ultrapure water. Simultaneously, the concentrated water produced by the secondary treatment module is stored in a primary water tank and treated again by the secondary treatment module. Unused ultrapure water at the point of use is stored in a secondary water tank. This method, compared to boron removal using only reverse osmosis, improves the boron removal efficiency of the water to be treated by adding two boron removal modules after the reverse osmosis module, meeting industry requirements. Furthermore, it re-enters the water treatment cycle from the secondary treatment module and the point of use, reducing the number of water treatment steps and improving water treatment efficiency. Therefore, it improves the preparation effect of ultrapure water from two aspects.

[0058] Optionally, the method further includes: identifying the primary processing module, secondary processing module, and tertiary processing module as target modules; mathematically modeling the ultrapure water preparation system based on the front-end liquid flow rate of each target module to obtain a system efficiency model and a system cost model, wherein the system cost model is used to characterize the relationship between the front-end liquid flow rate and the system operating efficiency, and the system efficiency parameter is used to characterize the relationship between the front-end liquid flow rate and the system operating cost; constructing a two-level optimization model based on the system efficiency model and the system cost model, wherein the upper-level model of the two-level optimization model takes maximizing the system operating efficiency as the optimization objective, and the lower-level model of the two-level optimization model takes minimizing the system operating cost as the optimization objective; solving the two-level optimization model, and controlling the front-end liquid flow rate of each target module based on the solution results, wherein the solution results include the expected flow rate corresponding to each target module.

[0059] Optionally, the system efficiency model can be established using the following methods: If the target module includes a filter device, the filtration efficiency of the filter device is determined based on the mass of impurities at the front and rear ends of the filter device. A mathematical model is then performed based on the filtration efficiency of the filter device and the liquid flow rate at the front end of the target module to obtain the corresponding water treatment model for the filter device. If the target module includes a reverse osmosis unit, the water recovery rate of the reverse osmosis unit is determined based on the total feed water volume and the freshwater output of the reverse osmosis unit. The desalination rate of the reverse osmosis unit is determined based on the feed water salt concentration and the freshwater salt concentration of the reverse osmosis unit. The reverse osmosis unit's water treatment model is obtained by mathematically modeling the water recovery rate, desalination rate, and front-end liquid flow rate of the target module. If the target module includes a boron removal unit, the boron removal efficiency is determined based on the boron ion concentration at the front end and the boron particle concentration at the back end of the boron removal unit. The boron removal efficiency and front-end liquid flow rate of the target module are then used to mathematically model the boron removal unit's water treatment model. Based on the water treatment model corresponding to the target module, a module efficiency model is established for the target module, and the efficiency models of each module are calculated to obtain the system efficiency model.

[0060] In some embodiments, different maximum flow rate thresholds and minimum flow rate thresholds are set for different target modules, and a constraint model is established for the front-end liquid flow rate of the target module based on the maximum flow rate thresholds and minimum flow rate thresholds.

[0061] In some embodiments, the device water treatment model corresponding to the filter device is represented as follows:

[0062]

[0063] In the formula, Q1 is the water treatment rate of the filter device, and V front Let P1 be the liquid flow rate at the front end of the target module, P1 be the filtration efficiency of the filter device, m' be the mass of impurities at the front end of the filter device, and m be the mass of impurities at the back end of the filter device.

[0064] In some embodiments, constraints are established on the filtration efficiency of the filter device based on maximum and minimum values.

[0065] In some embodiments, the water treatment model of a reverse osmosis unit is represented as follows:

[0066]

[0067] In the formula, Q2 is the device water treatment rate of the reverse osmosis unit, P2 is the water recovery efficiency of the reverse osmosis unit, and M... output For freshwater production, M input P2' is the total feed water volume, P2' is the desalination rate of the reverse osmosis unit, and C is the total feed water volume.output C represents the effluent salt concentration. input This refers to the salt concentration in the influent.

[0068] In some embodiments, the water treatment model corresponding to the boron removal device is represented as follows:

[0069]

[0070] In the formula, Q3 is the water treatment rate of the boron removal device, P3 is the boron removal efficiency of the boron removal device, and C B 'C represents the boron particle concentration at the back end of the boron removal device.' B The concentration of boron particles at the front end of the boron removal device.

[0071] In some embodiments, constraints are established on the boron removal efficiency of the boron removal device based on maximum and minimum values.

[0072] In some embodiments, the device water treatment models corresponding to the target module are added together to obtain the module efficiency model of the target module.

[0073] In some embodiments, the minimum value in the efficiency model of each module is taken as the system efficiency model.

[0074] Optionally, the system cost model can be established using the following method: The filter unit, reverse osmosis unit, and boron removal unit are identified as target units; the filter element attenuation of the target unit is determined based on the upstream liquid flow rate of the target module, the current operating time of the target unit, and the expected throughput of the target unit; mathematical modeling is then performed based on the filter element attenuation and the total price of the filter elements to obtain the unit cost model corresponding to the target unit; the module cost model of the target module is determined based on the unit cost model corresponding to the target module; mathematical modeling is performed based on the upstream liquid flow rate of the primary treatment module, the upstream liquid flow rate of the secondary treatment module, and the total capacity of the primary water tank to obtain the storage cost model corresponding to the primary water tank; and the system cost model is obtained by calculating the unit cost model corresponding to each target unit and the storage cost model corresponding to the primary water tank.

[0075] In some embodiments, the device cost model for the target device is expressed as follows:

[0076]

[0077] In the formula, C filter P represents the device cost of the target device. filter Z(t) represents the total cost of the filter cartridges in the target device, Z(t) represents the filter cartridge attenuation of the target device, t represents the current operating time of the target device, and T represents the expected throughput of the target device.

[0078] In some embodiments, the device cost models corresponding to the target modules are added together to obtain the module cost model of the target module.

[0079] In some embodiments, the storage cost model corresponding to the primary water tank is represented as follows:

[0080]

[0081] In the formula, C tank V represents the storage cost corresponding to the primary water tank, v1 is the liquid flow rate at the front end of the primary processing module, t1 is the current runtime of the primary processing module, v2 is the liquid flow rate at the front end of the secondary processing module, t2 is the current runtime of the secondary processing module, and V tank This refers to the total capacity corresponding to the primary water tank.

[0082] In some embodiments, the module cost model of the target module and the storage cost model corresponding to the primary water tank are added together to obtain the system cost model.

[0083] Optionally, the method further includes: presetting a first height threshold and a second height threshold, wherein the first height threshold is less than the second height threshold; obtaining the liquid level height of the primary water tank; if the liquid level height of the primary water tank is greater than or equal to the first height threshold, reducing the liquid flow rate at the front end of the primary processing module; if the liquid level height of the primary water tank is greater than or equal to the second height threshold, transporting the primary processed water in the primary water tank as the water to be treated to the raw water tank.

[0084] Optionally, the method further includes: setting a return port in the nitrogen-sealed water tank and connecting it to the primary water tank through the return port; controlling the liquid level of the nitrogen-sealed water tank at a preset reference height, wherein the preset reference height is higher than the return port; monitoring the liquid level of the nitrogen-sealed water tank and determining the liquid level change trend of the nitrogen-sealed water tank based on the detection results; if the liquid level change trend of the nitrogen-sealed water tank is an upward trend, then transporting the secondary treated water in the nitrogen-sealed water tank as primary treated water to the primary water tank through the return port; if the liquid level change trend of the nitrogen-sealed water tank is a downward trend, then increasing the front-end liquid flow rate of the secondary treatment module.

[0085] In some embodiments, after controlling the liquid level of the nitrogen-sealed water tank at a preset reference height, nitrogen is used to seal the liquid surface in the nitrogen-sealed water tank to ensure the quality of pure water. The nitrogen replenishment valve can be connected to an external nitrogen supply device to replenish nitrogen. The secondary treated water in the nitrogen-sealed water tank is transported to the primary treated water tank through the return port as primary treated water, or the liquid flow rate at the front end of the secondary treatment module is increased. All of these are based on the liquid level change trend of the nitrogen-sealed water tank. In order to maintain the liquid level balance of the nitrogen-sealed water tank, the volume of nitrogen used for nitrogen sealing remains basically unchanged, thereby effectively reducing nitrogen consumption and avoiding nitrogen waste.

[0086] Combination Figure 4 As shown, this embodiment of the present disclosure provides an ultrapure water preparation system, including a raw water tank 101, a primary treatment module 102, a primary water tank 103, a secondary treatment module 104, a secondary water tank 105, a tertiary treatment module 106, and a water usage point 107.

[0087] The raw water tank 101 is connected to the primary treatment module.

[0088] The primary treatment module 102 consists of a filter device. The primary treatment module is used to perform the first-stage treatment on the water to be treated in the raw water tank and store the first-stage treated water in the primary water tank.

[0089] The inlet of the primary water tank 103 is connected to the primary treatment module, and the outlet of the primary water tank is connected to the secondary treatment module.

[0090] The secondary treatment module 104 consists of a reverse osmosis unit and a boron removal unit. The secondary treatment module is used to perform a second stage of treatment on the primary treated water, store the fresh water obtained from the second stage of treatment as secondary treated water in the secondary water tank, and store the concentrated water produced from the second stage of treatment as primary treated water in the primary water tank.

[0091] The inlet of the secondary water tank 105 is connected to the secondary treatment module, and the outlet of the secondary water tank is connected to the tertiary treatment module.

[0092] The tertiary treatment module 106 consists of a boron removal device. The tertiary treatment module is used to perform a third-stage treatment on the secondary treated water to obtain ultrapure water.

[0093] Water point 107 connects to the three-stage treatment module at its inlet. The water point is used to use ultrapure water and stores unused ultrapure water in the secondary water tank.

[0094] This disclosure provides an ultrapure water preparation system. The system sequentially treats the water to be treated through a filter module in a primary treatment module, a reverse osmosis module and a boron removal module in a secondary treatment module, and a boron removal device in a tertiary treatment module to obtain ultrapure water. Simultaneously, the concentrated water produced by the secondary treatment module is stored in a primary water tank and treated again by the secondary treatment module. Unused ultrapure water at the point of use is stored in a secondary water tank. Therefore, compared to boron removal using only reverse osmosis, adding two boron removal modules after the reverse osmosis module improves the boron removal efficiency of the water to be treated, meeting industry requirements. Furthermore, it re-enters the water treatment cycle from the secondary treatment module and the point of use, reducing the number of water steps required for water treatment and improving water treatment efficiency. Thus, it improves the ultrapure water preparation effect from two aspects.

[0095] This disclosure also provides a water treatment device, including: a processor and a memory; the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the water treatment device performs the above-described method.

[0096] Figure 5 A schematic diagram of a computer system suitable for implementing the water treatment equipment of the embodiments of this application is shown. It should be noted that... Figure 5 The computer system 500 of the water treatment equipment shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0097] like Figure 5 As shown, the computer system 500 includes a Central Processing Unit (CPU) 501, which can perform various appropriate actions and processes, such as executing the methods described in the above embodiments, based on programs stored in Read-Only Memory (ROM) 502 or programs loaded from storage portion 508 into Random Access Memory (RAM) 503. The RAM 503 also stores various programs and data required for system operation. The CPU 501, ROM 502, and RAM 503 are interconnected via a bus 504. An Input / Output (I / O) interface 505 is also connected to the bus 504.

[0098] The following components are connected to I / O interface 505: an input section 506 including a keyboard, mouse, etc.; an output section 507 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 508 including a hard disk, etc.; and a communication section 509 including a network interface card such as a LAN (Local Area Network) card, modem, etc. The communication section 509 performs communication processing via a network such as the Internet. Drive 150 is also connected to I / O interface 505 as needed. Removable media 511, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 150 as needed so that computer programs read from them can be installed into storage section 508 as needed.

[0099] Specifically, according to embodiments of this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program including a computer program for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 509, and / or installed from removable medium 511. When the computer program is executed by central processing unit (CPU) 501, it performs various functions defined in the system of this application.

[0100] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying a computer-readable computer program. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0101] The water treatment device disclosed in this embodiment includes a processor, a memory, a transceiver, and a communication interface. The memory and the communication interface are connected to the processor and the transceiver and complete mutual communication. The memory is used to store computer programs, the communication interface is used for communication, and the processor and the transceiver are used to run the computer programs, so that the water treatment device performs the various steps of the above method.

[0102] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0103] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some sub-samples may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0104] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of the present disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for preparing ultrapure water, characterized in that, include: An ultrapure water preparation system is set up between the raw water tank and the point of use, wherein the ultrapure water preparation system includes a primary treatment module, a primary water tank, a secondary treatment module, a secondary water tank, and a tertiary treatment module connected in sequence. The water to be treated in the raw water tank is processed through the primary treatment module for the first stage of treatment, and the treated water obtained from the first stage of treatment is stored in the primary water tank. The primary treatment module consists of a filter device. The primary treated water is subjected to secondary treatment through the secondary treatment module. The fresh water obtained from the secondary treatment is stored as secondary treated water in the secondary water tank, and the concentrated water produced from the secondary treatment is stored as primary treated water in the primary water tank. The secondary treatment module consists of a reverse osmosis device and a boron removal device. The secondary treated water is then subjected to a third-stage treatment via the tertiary treatment module to obtain ultrapure water. The tertiary treatment module consists of a boron removal device. The water point is used to use the ultrapure water, and any unused ultrapure water is stored in the secondary water tank. The primary, secondary, and tertiary processing modules are designated as target modules. A mathematical model of the ultrapure water preparation system is constructed based on the front-end liquid flow rate of each target module, yielding a system efficiency model and a system cost model. The system efficiency model characterizes the relationship between the front-end liquid flow rate and system operating efficiency, while the system cost model characterizes the relationship between the front-end liquid flow rate and system operating cost. A two-layer optimization model is constructed based on the system efficiency and cost models. The upper layer of the two-layer optimization model aims to maximize system operating efficiency, while the lower layer aims to minimize system operating cost. The two-layer optimization model is solved, and the front-end liquid flow rate of each target module is controlled based on the solution results. The solution results include the desired flow rate corresponding to each target module.

2. The method according to claim 1, characterized in that, The system efficiency model is established using the following methods: If the target module includes a filter device, the filtration efficiency of the filter device is determined based on the mass of impurities at the front end of the filter device and the mass of impurities at the rear end of the filter device. Then, a mathematical model is performed based on the filtration efficiency of the filter device and the liquid flow rate at the front end of the target module to obtain the device water treatment model corresponding to the filter device. If the target module includes a reverse osmosis device, the water recovery rate of the reverse osmosis device is determined based on the total feed water volume and the freshwater output of the reverse osmosis device. The desalination rate of the reverse osmosis device is determined based on the feed water salt concentration and the freshwater salt concentration of the reverse osmosis device. A mathematical model is then performed based on the water recovery rate, the desalination rate, and the front-end liquid flow rate of the target module to obtain the device water treatment model of the reverse osmosis device. If the target module includes a boron removal device, the boron removal efficiency of the boron removal device is determined based on the boron ion concentration at the front end of the boron removal device and the boron particle concentration at the rear end of the boron removal device. Then, a mathematical model is performed based on the boron removal efficiency of the boron removal device and the liquid flow rate at the front end of the target module to obtain the device water treatment model of the boron removal device. Based on the water treatment model of the device corresponding to the target module, a module efficiency model of the target module is established, and the efficiency models of each module are calculated to obtain the system efficiency model.

3. The method according to claim 1, characterized in that, The system cost model is established using the following methods: The filter unit, the reverse osmosis unit, and the boron removal unit were identified as the target units respectively. The filter cartridge attenuation of the target device is determined based on the front-end liquid flow rate of the target module where the target device is located, the current operating time of the target device, and the expected throughput of the target device. Then, a mathematical model is performed based on the filter cartridge attenuation and the total price of the filter cartridges of the target device to obtain the device cost model corresponding to the target device. The module cost model of the target module is determined based on the device cost model corresponding to the target module; Based on the liquid flow rate at the front end of the primary processing module, the liquid flow rate at the front end of the secondary processing module, and the total capacity of the primary water tank, a mathematical model is performed to obtain the storage cost model corresponding to the primary water tank. The system cost model is obtained by calculating the device cost model corresponding to each of the target devices and the storage cost model corresponding to the primary water tank.

4. The method according to claim 1, characterized in that, The method further includes: A first height threshold and a second height threshold are preset, wherein the first height threshold is less than the second height threshold; Obtain the liquid level height of the primary water tank; If the liquid level in the primary water tank is greater than or equal to the first height threshold, then reduce the liquid flow rate at the front end of the primary processing module. If the liquid level in the primary water tank is greater than or equal to the second height threshold, then the primary treated water in the primary water tank is transported to the raw water tank as the water to be treated.

5. The method according to claim 1, characterized in that, The secondary water tank is a nitrogen-sealed water tank, and the method further includes: A reflux port is provided in the nitrogen-sealed water tank, and the primary water tank is connected through the reflux port. The liquid level in the nitrogen-sealed water tank is controlled at a preset reference height, wherein the preset reference height is higher than the reflux port; The liquid level in the nitrogen-sealed water tank is monitored, and the trend of liquid level change in the nitrogen-sealed water tank is determined based on the monitoring results. If the liquid level in the nitrogen-sealed water tank shows an upward trend, then the secondary treated water in the nitrogen-sealed water tank is transported to the primary treated water tank through the return port. If the liquid level in the nitrogen-sealed water tank shows a downward trend, then the front-end liquid flow rate of the secondary processing module should be increased.

6. The method according to claim 5, characterized in that, The method further includes: The nitrogen-sealed water tank consists of an inner water storage layer and an outer insulation layer. The water storage layer is used to store secondary treated water, and the insulation layer is used to control the water temperature of the secondary treated water at the optimal operating temperature of the tertiary treatment module.

7. The method according to any one of claims 1 to 6, characterized in that, The method includes at least one of the following: The primary processing module includes one or more of the following: mechanical filter, activated carbon filter, softening filter, and precision filter; The secondary processing module includes one or more reverse osmosis units, TOC removal units, boron removal units, and EDI units connected in sequence. The three-stage processing module includes a TOC removal device, a boron removal device, one or more polishing mixed beds, a sterilization device, and an ultrafiltration device connected in sequence.

8. An ultrapure water preparation system, characterized in that, include: The raw water tank is connected to the primary treatment module; The primary processing module consists of a filter device. The primary processing module is used to perform first-stage treatment on the water to be treated in the raw water tank and store the first-stage treated water in the primary water tank. The primary water tank has its inlet connected to the primary treatment module and its outlet connected to the secondary treatment module. The secondary treatment module consists of a reverse osmosis device and a boron removal device. The secondary treatment module is used to perform a second-stage treatment on the primary treated water, store the fresh water obtained from the second-stage treatment as secondary treated water in the secondary water tank, and store the concentrated water produced from the second-stage treatment as primary treated water in the primary water tank. The secondary water tank has its inlet connected to the secondary treatment module and its outlet connected to the tertiary treatment module. The tertiary treatment module consists of a boron removal device, and is used to perform a third-stage treatment on the secondary-treated water to obtain ultrapure water. A water point is provided, the inlet of which is connected to the three-stage treatment module. The water point is used to use the ultrapure water and to store unused ultrapure water in the secondary water tank. The system is further configured to: identify the primary processing module, the secondary processing module, and the tertiary processing module as target modules; perform mathematical modeling of the ultrapure water preparation system based on the front-end liquid flow rate of each target module to obtain a system efficiency model and a system cost model, wherein the system efficiency model characterizes the relationship between the front-end liquid flow rate and the system operating efficiency, and the system cost model characterizes the relationship between the front-end liquid flow rate and the system operating cost; construct a two-layer optimization model based on the system efficiency model and the system cost model, wherein the upper layer of the two-layer optimization model aims to maximize the system operating efficiency, and the lower layer of the two-layer optimization model aims to minimize the system operating cost; solve the two-layer optimization model, and control the front-end liquid flow rate of each target module based on the solution results, wherein the solution results include the expected flow rate corresponding to each target module.

9. A water treatment device, characterized in that, include: Processor and memory; The memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory to cause the water treatment device to perform the method as described in any one of claims 1 to 7.

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