Cost-effective reverse osmosis ph adjustment method and system

Abstract

The embodiment of the present application discloses a kind of reverse osmosis pH value adjusting method and system of reducing cost and increasing efficiency, set the initial frequency of a section of reverse osmosis concentrated water acid pump;Determine whether reverse osmosis system starts to water, if yes, open the acid pump;Determine whether reverse osmosis system reaches set recovery rate, if yes, collect two section reverse osmosis concentrated water pH value;Determine whether the pH value of the two section reverse osmosis concentrated water exceeds preset value range;When the pH value of the two section reverse osmosis concentrated water is in the preset value range, keep the frequency of a section of reverse osmosis concentrated water acid pump unchanged;When the pH value of the two section reverse osmosis concentrated water is greater than preset value range, increase the frequency of a section of reverse osmosis concentrated water acid pump based on frequency adjustment period;When the pH value of two section reverse osmosis concentrated water is less than preset value range, reduce the frequency of a section of reverse osmosis concentrated water acid pump based on frequency adjustment period.The reverse osmosis pH value adjusting method of reducing cost and increasing efficiency solves the problem of higher cost and poorer effect in the prior art for the adjustment of reverse osmosis pH value.

Description

Technical Field

[0001] This invention relates to the field of reverse osmosis pH adjustment technology, specifically to a cost-effective and efficiency-enhancing reverse osmosis pH adjustment method, system, electronic device, and storage medium. Background Technology

[0002] Reverse osmosis systems utilize specialized high-pressure water pumps to pressurize raw water to 6-20 kg, forcing it to permeate through a reverse osmosis membrane with a pore size of only 0.0001 micrometers. During membrane filtration, most chemical ions, especially Ca, Mg, Ba, and Sr ions, cannot pass through the membrane element and accumulate on the membrane surface with the water flow, leading to scaling and fouling. To prevent scaling, in addition to adding scale inhibitors, adding acid to the water can appropriately lower the pH value of the feed water, thus inhibiting reverse osmosis scaling to some extent.

[0003] Existing reverse osmosis systems generally employ a two-stage design, with the acid addition port located at the first-stage inlet in all current designs, which presents the following drawbacks: During the process of membrane filtration and concentration of water, the tendency for scaling is constantly increasing. For example, in a reverse osmosis system with a 75% recovery rate, the salt content of the concentrate in the first stage is twice that of the feed water to the membrane. In most cases, scaling and fouling of the first stage of the reverse osmosis membrane can be controlled by scale inhibitors alone, while the second stage of the reverse osmosis membrane is the key to controlling scaling in the system.

[0004] Reverse osmosis membranes exhibit significant differences in removal rates for different ions. The smaller the particle size of chemical ions, the easier they are to pass through the membrane element (i.e., the lower the removal rate). For example, the removal rate for hydrochloric acid (HCl) is less than 30%, while the Dow BW30 series reverse osmosis brackish water membrane has a HCl removal rate of 28%, and other brands of similar membrane elements are similar. However, the removal rate for metal salts is generally as high as 97% or more. Therefore, in this process, the vast majority of the added hydrochloric acid (HCl) enters the product water side, and the hydrochloric acid (HCl) content on the concentrate side is greatly reduced, and the pH continuously increases. By the second stage of the reverse osmosis membrane, the contribution of hydrochloric acid to inhibiting scaling is continuously reduced. Most of the hydrochloric acid (HCl) enters the product water side, resulting in a significant waste of HCl. Simultaneously, the increased hydrogen ion (H+) content on the product water side negatively impacts the subsequent secondary reverse osmosis membrane system and EDI system, requiring the addition of alkali (NaOH) to restore pH, which is detrimental to system stability and wastes industrial chemicals (HCl, NaOH), increasing operating costs. The addition of chemicals raises the osmotic pressure of the water; the extra HCl and NaOH, while wasting chemicals, also increase the filtration pressure required by the membrane system, leading to energy waste.

[0005] Therefore, there is an urgent need for a reverse osmosis pH adjustment method that can reduce costs and increase efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a cost-effective reverse osmosis pH adjustment method, system, electronic device, and storage medium to solve the problems of high cost and poor effect in the prior art for adjusting reverse osmosis pH.

[0007] To achieve the above objectives, embodiments of the present invention provide a cost-effective and efficiency-enhancing method for adjusting the pH value of reverse osmosis, the method specifically comprising: Set the initial frequency of the reverse osmosis concentrate and acid pump; Determine if the reverse osmosis system has started receiving water; if so, turn on the acid pump. Determine if the reverse osmosis system has reached the set recovery rate. If so, collect the pH value of the second-stage reverse osmosis concentrate. Determine whether the pH value of the second-stage reverse osmosis concentrate exceeds the preset range; When the pH value of the second-stage reverse osmosis concentrate is within the preset range, the frequency of the first-stage reverse osmosis concentrate acid addition pump remains unchanged. When the pH value of the second-stage reverse osmosis concentrate is greater than the preset value range, the frequency of the first-stage reverse osmosis concentrate acid pump is increased based on the frequency adjustment cycle. When the pH value of the second-stage reverse osmosis concentrate is less than the preset range, the frequency of the first-stage reverse osmosis concentrate acid addition pump is reduced based on the frequency adjustment cycle.

[0008] Based on the above technical solution, the present invention can be further improved as follows: Furthermore, the preset value range is 6.0-6.5.

[0009] Furthermore, the frequency adjustment cycle of the reverse osmosis concentrate acid addition pump is 1 Hz / minute.

[0010] Furthermore, determining whether the reverse osmosis system has started receiving water, and if so, turning on the acid pump, includes: The acid pump is installed at a section of the concentrated water pipe.

[0011] Furthermore, the determination of whether the reverse osmosis system has reached the set recovery rate, and if so, the pH value of the second-stage reverse osmosis concentrate, includes: A first pH meter is installed at the second-stage concentrate pipe to obtain the pH value of the second-stage reverse osmosis concentrate. The amount of acid added by the acid pump is controlled by the pH value of the second-stage reverse osmosis concentrate.

[0012] Furthermore, the cost-reducing and efficiency-enhancing reverse osmosis pH adjustment method also includes: A second pH meter is installed at the main product water pipe to obtain the pH value of the main product water pipe, and the amount of alkali added to the reverse osmosis system is controlled by the pH value of the main product water pipe.

[0013] A cost-effective and efficiency-enhancing reverse osmosis pH adjustment system includes: The setting module is used to set the initial frequency of a reverse osmosis concentrate acid addition pump. The first judgment module is used to determine whether the reverse osmosis system has started to receive water. If so, the acid pump is turned on. The second judgment module is used to determine whether the reverse osmosis system has reached the set recovery rate. If so, it collects the pH value of the second-stage reverse osmosis concentrate. The third judgment module is used to determine whether the pH value of the second-stage reverse osmosis concentrate exceeds the preset value range. When the pH value of the second-stage reverse osmosis concentrate is within the preset range, the frequency of the first-stage reverse osmosis concentrate acid addition pump remains unchanged. When the pH value of the second-stage reverse osmosis concentrate is greater than the preset value range, the frequency of the first-stage reverse osmosis concentrate acid pump is increased based on the frequency adjustment cycle. When the pH value of the second-stage reverse osmosis concentrate is less than the preset range, the frequency of the first-stage reverse osmosis concentrate acid addition pump is reduced based on the frequency adjustment cycle.

[0014] Furthermore, the cost-reducing and efficiency-enhancing reverse osmosis pH adjustment system also includes a first-stage reverse osmosis system, a second-stage reverse osmosis system, a first-stage inlet pipe, a first-stage concentrate pipe, a second-stage concentrate pipe, and a main product water pipe. The inlet pipe is connected to the reverse osmosis section and is used for water intake; The first and second reverse osmosis sections are connected by a concentrate pipe. The two-stage concentrate pipe is connected to the two-stage reverse osmosis system. The main product water pipe is connected to the first and second reverse osmosis sections: The hydrochloric acid dosing point is set at the section of the concentrate pipe; A first pH meter is installed at the second-stage concentrate pipe to obtain the pH value of the second-stage reverse osmosis concentrate. The amount of acid added by the acid pump is controlled by the pH value of the second-stage reverse osmosis concentrate. A second pH meter is installed at the main product water pipe to obtain the pH value of the main product water pipe, and the amount of alkali added to the reverse osmosis system is controlled by the pH value of the main product water pipe.

[0015] An electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to perform the steps of the method described herein.

[0016] A non-transitory computer-readable storage medium having a computer program stored thereon, the computer program implementing the steps of the method when executed by a processor.

[0017] The embodiments of the present invention have the following advantages: This invention provides a cost-effective reverse osmosis pH adjustment method. The method involves setting an initial frequency for a first-stage reverse osmosis concentrate acid pump; determining if the reverse osmosis system has started feeding water, and if so, turning on the acid pump; determining if the reverse osmosis system has reached a set recovery rate, and if so, collecting the pH value of the second-stage reverse osmosis concentrate; determining if the pH value of the second-stage reverse osmosis concentrate exceeds a preset range; when the pH value of the second-stage reverse osmosis concentrate is within the preset range, maintaining the frequency of the first-stage reverse osmosis concentrate acid pump unchanged; when the pH value of the second-stage reverse osmosis concentrate is greater than the preset range, increasing the frequency of the first-stage reverse osmosis concentrate acid pump based on a frequency adjustment cycle; and when the pH value of the second-stage reverse osmosis concentrate is less than the preset range, decreasing the frequency of the first-stage reverse osmosis concentrate acid pump based on a frequency adjustment cycle. This method solves the problems of high cost and poor effectiveness in adjusting reverse osmosis pH in existing technologies. Attached Figure Description

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0020] Figure 1 The flowchart shows the cost-reducing and efficiency-enhancing reverse osmosis pH adjustment method of the present invention. Figure 2 This is a first architecture diagram of the reverse osmosis pH adjustment system of the present invention for reducing costs and increasing efficiency; Figure 3 This is a second architecture diagram of the reverse osmosis pH adjustment system of the present invention, which reduces costs and increases efficiency; Figure 4 This is a schematic diagram of the physical structure of the electronic device provided by the present invention.

[0021] The attached figures are labeled as follows: Setting module 10, first judgment module 20, second judgment module 30, third judgment module 40, reverse osmosis stage 1 50, reverse osmosis stage 2 60, first stage inlet pipe 70, first stage concentrate pipe 80, second stage concentrate pipe 90, product water main pipe 100, electronic equipment 110, processor 1101, memory 1102, bus 1103. Detailed Implementation

[0022] The following specific embodiments 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. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example Figure 1 The flowchart of an embodiment of the cost-reducing and efficiency-enhancing reverse osmosis pH adjustment method of the present invention is as follows: Figure 1 As shown, the cost-reducing and efficiency-enhancing reverse osmosis pH adjustment method provided in this embodiment of the invention includes the following steps: S101, set the initial frequency of a reverse osmosis concentrate and acid pump; S102, determine if the reverse osmosis system has started to receive water; if so, turn on the acid pump. Specifically, the acid pump is installed at point 80 of a concentrated water pipe.

[0024] S103, determine whether the reverse osmosis system has reached the set recovery rate. If so, collect the pH value of the second-stage reverse osmosis concentrate. Specifically, a first pH meter is installed at 90 on the second-stage concentrate pipe. The pH value of the second-stage reverse osmosis concentrate is obtained through the first pH meter, and the amount of acid added by the acid pump is controlled by the pH value of the second-stage reverse osmosis concentrate.

[0025] S104 determines whether the pH value exceeds the preset range.

[0026] Specifically, the preset value range is 6.0-6.5.

[0027] S105, when the pH value is within the preset range, the frequency of the reverse osmosis concentrate acid addition pump remains unchanged; S106, When the pH value is greater than the preset range, the frequency of the reverse osmosis concentrate acid pump is increased by a certain amount based on the frequency adjustment cycle. Specifically, the frequency adjustment cycle of the reverse osmosis concentrate and acid addition pump is 1 Hz / minute.

[0028] S107, when the pH value of the second-stage reverse osmosis concentrate is less than the preset range, the frequency of the first-stage reverse osmosis concentrate acid pump is reduced based on the frequency adjustment cycle. The cost-reduction and efficiency-enhancing reverse osmosis pH adjustment method also includes: A second pH meter is installed at the main product water pipe 100. The pH value of the main product water pipe 100 is obtained through the second pH meter, and the amount of alkali added to the reverse osmosis system is controlled through the pH value of the main product water pipe 100.

[0029] Preferably, the test was conducted using 25 reverse osmosis membrane elements of size 8040, with a ratio of 15:10 between the first-stage and second-stage membrane elements, a system recovery rate of 75%, a rated water production capacity of 16.5 m³ / h, and the water source being surface water concentrated by the first-stage reverse osmosis.

[0030] (1) The addition of acid and alkali was controlled by metering pumps. The acid addition point was the membrane feed water and the first membrane concentrate, and the alkali addition point was the total system permeate. (2) Install a first pH meter at the second stage concentrate pipe 90 and a second pH meter at the product water main pipe 100. The amount of acid added is controlled by the pH value of the second stage reverse osmosis concentrate (control pH value = 6.2 ± 0.2), and the amount of alkali added is controlled by the pH value of the product water main pipe 100 (control pH value of the product water main pipe 100 = 8.0 ± 0.2); (3) Record and generate the experimental data as shown in Table 1: Table 1 According to the experimental data, the present invention has the following advantages: While ensuring that the pH value of the second-stage concentrate remains basically unchanged, the amount of hydrochloric acid used can be effectively reduced by about 35.2%, and the amount of industrial alkali used can be effectively reduced by 67%.

[0031] In a 100t / h reverse osmosis system at a water temperature of 25℃, to maintain the same scale inhibition efficiency, the addition of 35g of HCl and 38.4g of NaOH can be reduced. According to the osmotic pressure formula: π = cRT; In the formula: π is the osmotic pressure of the dilute solution; c is the molar concentration, with units of mol / L. It can also be expressed as C = n / V (amount of substance (mol) / volume (L)).

[0032] R is the ideal gas constant. When π is in kPa and V is in liters (L), the value of R is 8.314 J·K. -1 ·mol -1 .

[0033] T represents heat, measured in Kelvin. The conversion between Kelvin and Celsius is T(K) = 273 + T(C), for example, 25 degrees Celsius = 298 Kelvin.

[0034] Calculations show that adding hydrochloric acid and sodium hydroxide will increase the osmotic pressure by 4.76 kPa, and similarly, will increase the reverse osmosis pump drive pressure by 4.76 kPa. According to the pump energy formula: flow rate × head / (367.2 × pump efficiency), improvements can reduce the pump operating energy consumption of the membrane system.

[0035] Reverse osmosis removal rate: refers to the ability of ions to pass through reverse osmosis. The higher the removal rate, the less ability ions can pass through the reverse osmosis membrane to enter the fresh water side. For example, a 90% removal rate means that after the ions are filtered through the reverse osmosis membrane, the ion content on the fresh water side is 10% of that in the feed water.

[0036] This cost-effective reverse osmosis pH adjustment method involves: setting an initial frequency for the first-stage reverse osmosis concentrate acid addition pump; determining if the reverse osmosis system has started feeding water, and if so, turning on the acid addition pump; determining if the reverse osmosis system has reached a set recovery rate, and if so, collecting the pH value of the second-stage reverse osmosis concentrate; determining if the pH value of the second-stage reverse osmosis concentrate exceeds a preset range; when the pH value of the second-stage reverse osmosis concentrate is within the preset range, maintaining the frequency of the first-stage reverse osmosis concentrate acid addition pump unchanged; when the pH value of the second-stage reverse osmosis concentrate is greater than the preset range, increasing the frequency of the first-stage reverse osmosis concentrate acid addition pump based on a frequency adjustment cycle; and when the pH value of the second-stage reverse osmosis concentrate is less than the preset range, decreasing the frequency of the first-stage reverse osmosis concentrate acid addition pump based on a frequency adjustment cycle. This method solves the problems of high cost and poor effectiveness in adjusting reverse osmosis pH in existing technologies.

[0037] This cost-effective and efficiency-enhancing reverse osmosis pH adjustment method involves changing the location of the dosing point, monitoring the dosing effect through frequency control and installing a pH meter at the end of the reverse osmosis system, and adjusting the frequency of the upstream dosing pump based on the pH feedback to rationally control the dosing amount. This ensures the scale inhibition effect of hydrochloric acid (HCl) on the membrane system while precisely controlling the HCl dosing amount, effectively improving the efficiency of HCl use and reducing the consumption of HCl, scale inhibitors, and subsequent NaOH. If the membrane system only has carbonate scaling, the dosage can be adjusted according to carbonate (CO3) ions. 2- ), bicarbonate (HCO3) - The conversion relationship between ions and carbonic acid (H2CO3) is such that when the pH is close to 6, there are almost no carbonate ions in the water. Therefore, it is not even necessary to use scale inhibitors to control carbonate scale. Scale can be controlled by hydrochloric acid alone, avoiding the waste of scale inhibitors, acids and alkalis and other industrial chemicals, and reducing the cost of chemical use.

[0038] Figures 2-3This is a flowchart illustrating an embodiment of the cost-reducing and efficiency-enhancing reverse osmosis pH adjustment system of the present invention; as shown. Figures 2-3 As shown in the figure, an embodiment of the present invention provides a cost-reducing and efficiency-enhancing reverse osmosis pH adjustment system, which includes the following steps: Setting module 10 is used to set the initial frequency of a reverse osmosis concentrate acid addition pump; The first judgment module 20 is used to determine whether the reverse osmosis system has started to receive water. If so, the acid pump is turned on. The second judgment module 30 is used to determine whether the reverse osmosis system has reached the set recovery rate. If so, it collects the pH value of the second-stage reverse osmosis concentrate. The third judgment module 40 is used to determine whether the pH value of the second-stage reverse osmosis concentrate exceeds the preset value range. When the pH value of the second-stage reverse osmosis concentrate is within the preset range, the frequency of the first-stage reverse osmosis concentrate acid addition pump remains unchanged. When the pH value of the second-stage reverse osmosis concentrate is greater than the preset value range, the frequency of the first-stage reverse osmosis concentrate acid pump is increased based on the frequency adjustment cycle. When the pH value of the second-stage reverse osmosis concentrate is less than the preset range, the frequency of the first-stage reverse osmosis concentrate acid addition pump is reduced based on the frequency adjustment cycle.

[0039] The cost-reducing and efficiency-enhancing reverse osmosis pH adjustment system also includes a first-stage reverse osmosis pipe 50, a second-stage reverse osmosis pipe 60, a first-stage inlet pipe 70, a first-stage concentrate pipe 80, a second-stage concentrate pipe 90, and a main product water pipe 100. The inlet pipe 70 is connected to the reverse osmosis section 50 and is used for water intake; The first stage of reverse osmosis 50 and the second stage of reverse osmosis 60 are connected by a concentrated water pipe 80; The second-stage concentrate pipe 90 is connected to the second-stage reverse osmosis pipe 60; The main water supply pipe 100 is connected to the first stage of reverse osmosis 50 and the second stage of reverse osmosis 60: The hydrochloric acid dosing point is set at point 80 of the concentrated water pipe. A first pH meter is installed at the second-stage concentrate pipe 90. The pH value of the second-stage reverse osmosis concentrate is obtained through the first pH meter, and the amount of acid added by the acid pump is controlled by the pH value of the second-stage reverse osmosis concentrate. A second pH meter is installed at the main product water pipe 100 to obtain the pH value of the main product water pipe 100, and the amount of alkali added to the reverse osmosis system is controlled by the pH value of the main product water pipe 100.

[0040] Figure 4 This is a schematic diagram of the physical structure of an electronic device provided in an embodiment of the present invention, such as... Figure 4As shown, the electronic device 110 includes: a processor 1101, a memory 1102, and a bus 1103; The processor 1101 and the memory 1102 communicate with each other via the bus 1103. The processor 1101 is used to call program instructions in the memory 1102 to execute the methods provided in the above-described method embodiments, including, for example, setting the initial frequency of a first-stage reverse osmosis concentrate acid pump; determining whether the reverse osmosis system has started to receive water, and if so, turning on the acid pump; determining whether the reverse osmosis system has reached a set recovery rate, and if so, collecting the pH value of the second-stage reverse osmosis concentrate; determining whether the pH value of the second-stage reverse osmosis concentrate exceeds a preset value range; when the pH value of the second-stage reverse osmosis concentrate is within the preset value range, maintaining the frequency of the first-stage reverse osmosis concentrate acid pump unchanged; when the pH value of the second-stage reverse osmosis concentrate is greater than the preset value range, increasing the frequency of the first-stage reverse osmosis concentrate acid pump based on a frequency adjustment cycle; and when the pH value of the second-stage reverse osmosis concentrate is less than the preset value range, decreasing the frequency of the first-stage reverse osmosis concentrate acid pump based on a frequency adjustment cycle.

[0041] This embodiment provides a non-transitory computer-readable storage medium storing computer instructions that cause a computer to execute the methods provided in the above-described method embodiments. These instructions include, for example: setting an initial frequency for a first-stage reverse osmosis concentrate acid pump; determining whether the reverse osmosis system has started receiving water, and if so, turning on the acid pump; determining whether the reverse osmosis system has reached a set recovery rate, and if so, collecting the pH value of the second-stage reverse osmosis concentrate; determining whether the pH value of the second-stage reverse osmosis concentrate exceeds a preset value range; when the pH value of the second-stage reverse osmosis concentrate is within the preset value range, maintaining the frequency of the first-stage reverse osmosis concentrate acid pump unchanged; when the pH value of the second-stage reverse osmosis concentrate is greater than the preset value range, increasing the frequency of the first-stage reverse osmosis concentrate acid pump based on a frequency adjustment cycle; and when the pH value of the second-stage reverse osmosis concentrate is less than the preset value range, decreasing the frequency of the first-stage reverse osmosis concentrate acid pump based on a frequency adjustment cycle.

[0042] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various storage media capable of storing program code, such as ROM, RAM, magnetic disk, or optical disk.

[0043] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the 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 modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0044] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of each embodiment or some parts of the embodiments.

[0045] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A cost-effective and efficiency-enhancing reverse osmosis pH adjustment system, characterized in that, include: The setting module is used to set the initial frequency of a reverse osmosis concentrate acid addition pump. The first judgment module is used to determine whether the reverse osmosis system has started to receive water. If so, the acid pump is turned on. The second judgment module is used to determine whether the reverse osmosis system has reached the set recovery rate. If so, it collects the pH value of the second-stage reverse osmosis concentrate. The third judgment module is used to determine whether the pH value of the second-stage reverse osmosis concentrate exceeds the preset value range. When the pH value of the second-stage reverse osmosis concentrate is within the preset range, the frequency of the first-stage reverse osmosis concentrate acid addition pump remains unchanged. When the pH value of the second-stage reverse osmosis concentrate is greater than the preset value range, the frequency of the first-stage reverse osmosis concentrate acid pump is increased based on the frequency adjustment cycle. When the pH value of the second-stage reverse osmosis concentrate is less than the preset range, the frequency of the first-stage reverse osmosis concentrate acid pump is reduced based on the frequency adjustment cycle. The cost-reducing and efficiency-enhancing reverse osmosis pH adjustment system also includes a first-stage reverse osmosis system, a second-stage reverse osmosis system, a first-stage inlet pipe, a first-stage concentrate pipe, a second-stage concentrate pipe, and a main product water pipe. The inlet pipe is connected to the reverse osmosis section and is used for water intake; The first and second reverse osmosis sections are connected by a concentrate pipe. The two-stage concentrate pipe is connected to the two-stage reverse osmosis system. The main product water pipe is connected to the first and second reverse osmosis sections; The hydrochloric acid dosing point is set at the section of the concentrate pipe; A first pH meter is installed at the second-stage concentrate pipe to obtain the pH value of the second-stage reverse osmosis concentrate. The amount of acid added by the acid pump is controlled by the pH value of the second-stage reverse osmosis concentrate. A second pH meter is installed at the main product water pipe to obtain the pH value of the main product water pipe, and the amount of alkali added to the reverse osmosis system is controlled by the pH value of the main product water pipe.

2. A method for adjusting the pH value of a reverse osmosis pH value adjustment system as described in claim 1, characterized in that, The method specifically includes: Set the initial frequency of the reverse osmosis concentrate and acid pump; Determine if the reverse osmosis system has started receiving water; if so, turn on the acid pump. Determine if the reverse osmosis system has reached the set recovery rate. If so, collect the pH value of the second-stage reverse osmosis concentrate. Determine whether the pH value of the second-stage reverse osmosis concentrate exceeds the preset range; When the pH value of the second-stage reverse osmosis concentrate is within the preset range, the frequency of the first-stage reverse osmosis concentrate acid addition pump remains unchanged. When the pH value of the second-stage reverse osmosis concentrate is greater than the preset value range, the frequency of the first-stage reverse osmosis concentrate acid pump is increased based on the frequency adjustment cycle. When the pH value of the second-stage reverse osmosis concentrate is less than the preset range, the frequency of the first-stage reverse osmosis concentrate acid addition pump is reduced based on the frequency adjustment cycle.

3. The cost-reducing and efficiency-enhancing reverse osmosis pH adjustment method according to claim 2, characterized in that, The preset value range is 6.0-6.

5.

4. The cost-reducing and efficiency-enhancing reverse osmosis pH adjustment method according to claim 2, characterized in that, The frequency adjustment cycle of the reverse osmosis concentrate acid addition pump is 1 Hz / minute.

5. The cost-reducing and efficiency-enhancing reverse osmosis pH adjustment method according to claim 2, characterized in that, The step of determining whether the reverse osmosis system has started receiving water, and if so, turning on the acid pump, includes: The acid pump is installed at a section of the concentrated water pipe.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method as described in any one of claims 2 to 5.

7. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 2 to 5.

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