Control method of water treatment equipment and water treatment equipment

Abstract

The invention relates to the technical field of water treatment, and provides a control method of water treatment equipment and the water treatment equipment. The method comprises the following steps: a normal water production step: opening a water inlet valve (2) and a pure water outlet valve (4), starting a pump, and closing a reflux control valve (1) and a pure water reflux valve (5), so that raw water is filtered by an RO membrane assembly and then is discharged from the pure water outlet valve (4) for a user to use; the first cup water pretreatment step sequentially comprises a pure water storage stage, a wastewater valve explosion flushing stage and an RO membrane flushing stage; a standby step: closing the control valve and the pump to enable the water treatment equipment to enter a standby state; and an intelligent adjustment step: based on the pH value monitoring result provided by the pH developing module, dynamically adjusting mineralization parameters and flushing parameters by the control unit. According to the technical scheme, through multi-stage intelligent flushing and real-time pH monitoring and adjusting, the desalting rate of the cup water is remarkably increased, stable control over the water quality is achieved, and meanwhile the water resource utilization efficiency is optimized.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, and in particular to a control method and a water treatment device. Background Technology

[0002] As people's living standards improve, the requirements for drinking water quality are becoming increasingly stringent. Reverse osmosis (RO) water purification technology, as one of the most effective advanced water treatment technologies currently available, can effectively remove dissolved salts, colloids, bacteria, viruses, and other impurities from water, and is widely used in both residential and commercial water purification. However, during the operation of RO water treatment equipment, when the equipment restarts from standby mode, high-concentration wastewater is generated before and after the RO membrane due to osmotic pressure. This leads to a decrease in the desalination rate of the initial effluent (i.e., the "first cup water"), directly affecting the safety of drinking water quality.

[0003] Traditional RO water treatment equipment typically uses simple flushing methods to address the issue of the first cup of water. For example, some equipment briefly flushes the membrane surface by opening the wastewater valve before water production, or uses timed flushing programs to reduce the accumulation of contaminants. Furthermore, to improve the taste of drinking water, some high-end water treatment equipment adds mineralization functions, adjusting the pH (acidity / alkalinity) and hardness of the effluent by adding mineral elements. Regarding water quality monitoring, current technologies mostly rely on manual testing using pH test strips or reagents. For instance, wide-spectrum pH test strips use multi-colored mixed indicators, but suffer from problems such as the colored portion easily detaching and inability to be reused; while precision pH test strips, although stable, require comparison with a color chart for interpretation, making the readings less intuitive.

[0004] However, existing technologies still have the following significant drawbacks: 1) Traditional rinsing methods often fail to rinse thoroughly, making it difficult to effectively address the low desalination rate of the first cup water and potentially leading to water waste; 2) Existing pH monitoring methods lack effective integration with water purification process control, making it impossible to dynamically adjust mineralization parameters based on real-time water quality data; 3) The mineralization process is easily affected by dissolved carbon dioxide in the water, resulting in unstable pH adjustment effects. Especially when water treatment equipment needs to simultaneously meet multiple water quality requirements, existing technologies struggle to achieve precise water quality control and stable effluent quality. Summary of the Invention

[0005] Based on this, it is necessary to address the technical problems of incomplete rinsing, inability to dynamically adjust mineralization parameters, and unstable pH adjustment effects in the existing technologies mentioned above, and propose a control method and water treatment equipment for water treatment equipment.

[0006] In a first aspect, a control method for a water treatment device is provided. The method controls the water treatment device, which includes: a control valve, an RO membrane module, a pre-filter PPC composite filter, a post-filter CB filter, a pH colorimetric module, a pump, and a control unit. The control valve includes a reflux control valve (1), an inlet valve (2), a pure water outlet valve (4), and a pure water reflux valve (5). The inlet of the inlet valve (2) is connected to the raw water input, and the outlet of the pump is connected to the inlet of the RO membrane module. The pure water outlet of the RO membrane module is connected to the post-filter CB filter. The filter element is connected to the inlet of the pure water outlet valve (4), the outlet of the pure water outlet valve (4) is connected to the water outlet terminal, the wastewater outlet of the RO membrane module is connected to the inlet of the wastewater valve (3), the post-CB filter element is set in the water path between the pure water outlet of the RO membrane module and the outlet of the pure water outlet valve (4), the pure water reflux valve (5) is connected between the pure water outlet of the RO membrane module and the inlet of the PPC filter element, and the reflux control valve (1) is connected to the bypass pipeline between the raw water input and the inlet of the pump; The method includes the following steps: Normal water production steps: Open the inlet valve (2) and the pure water outlet valve (4), start the pump, close the reflux control valve (1) and the pure water reflux valve (5), so that the raw water is filtered through the RO membrane module and then discharged from the pure water outlet valve (4) for user use; The first cup water pretreatment steps include, in sequence, the pure water storage stage, the wastewater flushing stage, and the RO membrane flushing stage; Standby procedure: Close the control valve and pump to put the water treatment equipment into standby mode; Intelligent adjustment steps: Based on the pH value monitoring results provided by the pH colorimetric module, the control unit dynamically adjusts the mineralization parameters and rinsing parameters.

[0007] Optionally, the water treatment equipment further includes a wastewater valve (3), and the water storage stage in the first cup water pretreatment step includes: closing the inlet valve (2) and the pure water outlet valve (4), opening the reflux control valve (1) and the pure water reflux valve (5), and starting the pump so that the raw water is filtered by the RO membrane module and then refluxed back to the pre-filter PPC composite filter element for temporary storage through the pure water reflux valve (5); The wastewater valve flushing stage in the first cup water pretreatment step includes: closing the reflux control valve (1), the inlet valve (2), the pure water outlet valve (4) and the pure water reflux valve (5), fully opening the wastewater valve (3) and starting the pump to forcibly discharge the high-concentration wastewater in the RO membrane module at the maximum flow rate; The RO membrane rinsing stage in the first cup water pretreatment step includes closing the reflux control valve (1), the pure water outlet valve (4), the pure water return valve (5) and the pump, opening the inlet valve (2) and the wastewater valve (3), and using the natural pressure of tap water to push the pure water temporarily stored in the pre-filter PPC composite filter cartridge to rinse the RO membrane assembly.

[0008] Optionally, starting the pump to allow the raw water to be filtered through the RO membrane module and then returned to the pre-PPC composite filter cartridge via the pure water return valve (5) for temporary storage includes: The pump is started so that the raw water, after being filtered by the RO membrane module, flows directly back to the pre-filter PPC composite filter element for temporary storage via the pure water return valve (5); or The pump is started so that the raw water is filtered through the RO membrane module and the post-CB filter element, and then all of it is returned to the pre-PPC composite filter element for temporary storage via the pure water return valve (5); or The pump is started so that the raw water is filtered through the RO membrane module and the post-CB filter element, and then part of it is returned to the pre-PPC composite filter element for temporary storage through the pure water return valve (5).

[0009] Optionally, the water treatment equipment further includes a mixing valve (6) and a circulation return valve (7). The RO membrane rinsing stage in the first cup water pretreatment step includes closing the return control valve (1), the pure water outlet valve (4), the pure water return valve (5), and the mixing valve (6), opening the inlet valve (2) and the circulation return valve (7), and starting the pump. The pure water temporarily stored in the pre-filter PPC composite filter element is pushed in by the natural pressure of tap water to rinse the RO membrane assembly, and the pure water is returned to the pump inlet through the circulation return valve (7) to enhance the rinsing effect on the RO membrane surface.

[0010] Optionally, the water treatment equipment further includes a domestic water valve (A4) or a mineralized water valve (A6). The pH monitoring in the intelligent adjustment step adopts a mixed indicator colorimetric method. The mixed indicator contains methyl red, bromocresol green and thymol blue, forming a continuous color scale from red to blue, covering the pH range of 1 to 14. The pH colorimetric module is implemented through an automatic color recognition system, which includes scanning the color of the faucet via an intelligent electronic device or an integrated color sensor controlled by the domestic water valve (A4) or mineral water valve (A6), converting the color signal measured by the mixed indicator colorimetric method into a digital pH value, and automatically adjusting the release rate of the mineral filter cartridge installed after the RO membrane assembly based on the digital pH value.

[0011] Secondly, a water treatment device is provided, comprising a control valve, an RO membrane module, a pre-filter PPC composite filter, a post-filter CB filter, a pH colorimetric module, a pump, and a control unit. The control valve includes a reflux control valve (1), an inlet valve (2), a pure water outlet valve (4), and a pure water reflux valve (5). The inlet of the inlet valve (2) is connected to the raw water input, the outlet of the pump is connected to the inlet of the RO membrane module, and the pure water outlet of the RO membrane module is connected to the pure water outlet after the post-filter CB filter. The inlet of the outlet valve (4) is connected to the outlet terminal, the outlet of the pure water outlet valve (4) is connected to the inlet of the wastewater valve (3), the post-CB filter element is set in the water path between the pure water outlet of the RO membrane element and the outlet of the pure water outlet valve (4), the pure water return valve (5) is connected between the pure water outlet of the RO membrane element and the inlet of the PPC filter element, and the return control valve (1) is connected to the bypass pipeline between the raw water input and the inlet of the pump. The reflux control valve (1), inlet valve (2), pure water outlet valve (4), pure water reflux valve (5) and pump are used for normal water production, including: opening the inlet valve (2) and pure water outlet valve (4), starting the pump, closing the reflux control valve (1) and pure water reflux valve (5), so that the raw water is filtered through the RO membrane module and then discharged from the pure water outlet valve (4) for user use; The reflux control valve (1), inlet valve (2), pure water outlet valve (4) and pure water reflux valve (5) are used for the pretreatment of the first cup water, which includes the pure water storage stage, the wastewater flushing stage and the RO membrane flushing stage in sequence. The RO membrane module is used to filter raw water and / or pure water temporarily stored in the pre-PPC composite filter element; The pre-filter PPC composite filter element is used to temporarily store the pure water that flows out from the pure water return valve (5) after being filtered by the RO membrane module; The pump is used to provide water pressure during the normal water production and first-cup water pretreatment processes. The pH colorimetric module is used to detect the pH value of the water discharged from the pure water outlet valve (4); The control unit is configured to execute the control method of the water treatment equipment.

[0012] Optionally, the RO membrane assembly is a hybrid RO, NF, or UF membrane structure. The desalination rate of the first cup water of the water treatment equipment can be dynamically adjusted by adjusting the pressure of the booster pump and the opening of the wastewater valve (3).

[0013] Optionally, the water treatment equipment further includes a domestic water valve (A4) or a mineralized water valve (A6). The pH colorimetric module is implemented through an automatic color recognition system, which includes scanning the color with a mobile phone or integrating a color sensor on the faucet controlled by the domestic water valve (A4) or the mineralized water valve (A6), converting the color signal measured by the mixed indicator colorimetric method into a digital pH value, and automatically adjusting the release rate of the mineralized filter cartridge installed after the RO membrane module based on the digital pH value.

[0014] Optionally, the RO membrane module may have a structural component or a stop valve inside the central tube to reduce water volume, thereby lowering the concentration of water in the first cup and improving the desalination rate.

[0015] Optionally, the water treatment equipment is a coffee-specific water purifier, which includes magnesium balls and acidic resin. The pH value of the water effluent from the coffee-specific water purifier is 6-8, the hardness is 50-175 ppm, the alkalinity is 40-70 ppm, and the magnesium content is 15-25 ppm.

[0016] As can be seen from the technical solution provided in this application, on the one hand, by refining the first-cup water treatment into a multi-stage pretreatment process including storing pure water, flushing wastewater valves, and rinsing the RO membrane, with each stage controlled by specific valve combinations, a deep and thorough cleaning of the RO membrane system is achieved. This multi-stage coordinated rinsing method ensures that contaminants on the RO membrane surface are effectively removed, thereby reliably guaranteeing the desalination rate of the first-cup water when the equipment restarts. On the other hand, by introducing a pH colorimetric module and organically integrating it with the water purification control process, real-time monitoring and intelligent adjustment of the effluent water quality are achieved. The pH colorimetric module uses mixed indicators to form continuous color levels, which can intuitively reflect the water quality. Reflecting changes in water pH, the control unit dynamically adjusts mineralization and flushing parameters based on pH monitoring results. This closed-loop control mechanism ensures the stability of the effluent water quality. Thirdly, by optimizing valve control and pump operation strategies at each stage, unnecessary water waste is effectively reduced while ensuring flushing effectiveness. Particularly during the RO membrane flushing stage, low-energy, high-efficiency flushing is achieved by rationally utilizing tap water pressure and stored pure water. Furthermore, the modular design organically integrates pH monitoring, mineralization adjustment, and RO membrane flushing functions, enabling the equipment to adapt to different water quality environments and usage requirements. This flexibility and adaptability enhance the product's market competitiveness. In summary, the technical solution of this application significantly improves the desalination rate of the first cup water and achieves stable water quality control through multi-stage intelligent flushing and real-time pH monitoring and adjustment, while simultaneously optimizing water resource utilization efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a flowchart of a control method for a water treatment device in one embodiment; Figure 2 This is a schematic diagram of the water circuit connection and valve opening / closing status of a water treatment device in normal water production operation in one embodiment. Figure 3 This is a schematic diagram of the water circuit connection and valve opening / closing status of a water treatment device in one embodiment during the start-up head cup water rinsing-storage pure water stage; Figure 4 This is a schematic diagram of the water circuit connection and valve opening / closing status of the water treatment equipment in another embodiment during the start-up head cup water rinsing-storage pure water stage; Figure 5 This is a schematic diagram of the water circuit connection and valve opening / closing status of the water treatment equipment in another embodiment during the start-up head cup water rinsing-storage pure water stage; Figure 6 This is a schematic diagram of the water circuit connection and valve opening / closing status of the water treatment equipment in one embodiment during the first cup water flushing-bursting wastewater valve stage; Figure 7 This is a schematic diagram of the water circuit connection and valve opening / closing status of a water treatment device in one embodiment during the first cup water rinsing-RO membrane rinsing stage. Figure 8 This is a schematic diagram of the water circuit connection and valve opening / closing status of the water treatment equipment in another embodiment during the first cup water rinsing-RO membrane rinsing stage. Figure 9 One embodiment features a faucet integrated with a color sensor; Figure 10 This is a multi-stage mineralized filter element structure in one embodiment; Figure 11 This is a single-stage mineralized filter element structure in one embodiment; Figure 12 This is a cross-sectional view of the filter element of a coffee-specific water purifier in one embodiment. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0019] Traditional RO water treatment equipment typically employs simple flushing methods to address the issue of low desalination rates in the first cup of water. For example, some equipment briefly flushes by opening the wastewater valve before water production, or uses timed flushing programs to reduce the accumulation of contaminants on the membrane surface. Furthermore, to improve the taste of drinking water, some high-end water treatment equipment adds mineralization functions, adjusting the pH and hardness of the effluent by adding mineral elements. Regarding water quality monitoring, existing technologies mostly rely on manual testing using pH test strips or reagents. For instance, wide-area pH test strips use multi-color superimposed mixed indicators, but suffer from problems such as the color developing portion easily detaching and inability to be reused; while precision pH test strips, although more stable, require multiple color combinations for interpretation, making the readings less intuitive. However, existing technologies still have the following significant drawbacks: 1) Traditional flushing methods often fail to thoroughly clean the water, making it difficult to effectively address the low desalination rate of the first cup and potentially wasting water resources; 2) Existing pH monitoring methods lack effective integration with water purification process control, failing to dynamically adjust mineralization parameters based on real-time water quality data; 3) The mineralization process is easily affected by dissolved carbon dioxide in the water, leading to unstable pH adjustment effects. Especially when water treatment equipment needs to meet multiple water quality requirements at the same time, existing technologies struggle to achieve precise water quality control and stable effluent quality.

[0020] Please see Figure 1 As shown, Figure 1 This is a schematic flowchart of a control method for a water treatment device provided in an embodiment of the present invention. Figure 1The example method can be used to control a water treatment device, which includes: a control valve, an RO membrane module, a pre-filter PPC composite filter, a post-filter CB filter, a pH colorimetric module, a pump, and a control unit. The control valve includes a reflux control valve (1), an inlet valve (2), a pure water outlet valve (4), and a pure water reflux valve (5). The inlet of the inlet valve (2) is connected to the raw water input, the outlet of the pump is connected to the inlet of the RO membrane module, and the pure water outlet of the RO membrane module is the post-filter CB filter. The filter cartridge is connected to the inlet of the pure water outlet valve (4), the outlet of the pure water outlet valve (4) is connected to the outlet terminal, the wastewater outlet of the RO membrane module is connected to the inlet of the wastewater valve (3), the post-CB filter cartridge is installed in the water path between the pure water outlet of the RO membrane module and the outlet of the pure water outlet valve (4), the pure water reflux valve (5) is connected between the pure water outlet of the RO membrane module and the inlet of the PPC filter cartridge, and the reflux control valve (1) is connected to the bypass pipeline between the raw water input and the pump inlet. The method of implementing these components mainly includes steps S101 to S104, which are detailed below: Step S101: Normal water production steps: Open the inlet valve 2 and the pure water outlet valve 4, start the pump, close the reflux control valve 1 and the pure water reflux valve 5, so that the raw water is filtered through the RO membrane module and then discharged from the pure water outlet valve 4 for user use.

[0021] like Figure 2 The diagram illustrates the water circuit connections and valve opening / closing status of a water treatment system under normal operating conditions. This state is set by the control unit, whose core control logic includes: opening inlet valve 2 (marked as v / v #2 in the diagram) and pure water outlet valve 4 (marked as v / v #4 in the diagram), starting the pump, and closing reflux control valve 1 (marked as v / v #1 in the diagram) and pure water reflux valve 5 (marked as v / v #5 in the diagram). In this diagram, inlet valve 2 is open, allowing tap water to enter the pre-filter PPC composite filter cartridge (shown as "Pre-CB" in the diagram). Simultaneously, the pump is started to provide the working pressure required for the water flow to pass through the reverse osmosis (RO) membrane. At this time, pure water outlet valve 4 is in the open state, while the reflux-related valves, namely reflux control valve 1 and pure water reflux valve 5, remain closed. This valve assembly guides the water flow, forming the most direct water production path: raw water flows sequentially through the pre-filter PPC composite filter, pump, and RO membrane module. The pure water produced by the RO membrane module (water outlet on side O in the diagram) flows smoothly out from the pure water outlet valve 4 to supply the user, while the high-concentration wastewater retained by the RO membrane module is discharged through the wastewater valve 3 (marked as v / v #3 in the diagram). The normal water production process in the above embodiment can efficiently and stably produce pure water, which is the basic function of the entire system.

[0022] Step S102: Pretreatment steps for the first cup of water: including the pure water storage stage, the wastewater flushing stage, and the RO membrane flushing stage.

[0023] To address the issue of excessively high salt content in the initial effluent ("first cup water") upon restarting an RO system after a shutdown, this application introduces a multi-stage synergistic pretreatment process, including a pure water storage stage, a wastewater flushing stage, and an RO membrane flushing stage. These three sub-stages are executed sequentially to ensure that the RO membrane and its flow channels are adequately purified at the start of each water supply. Details are as follows: S102-1: Pure Water Storage Stage. The purpose of this stage is to prepare and store a portion of high-quality pure water in advance as a "cleaning agent" for subsequent RO membrane rinsing. The pure water storage stage is implemented as follows: close the inlet valve 2 and the pure water outlet valve 4, open the reflux control valve 1 and the pure water reflux valve 5, and start the pump so that the raw water is filtered through the RO membrane module and then refluxed back to the pre-PPC composite filter element for temporary storage through the pure water reflux valve (5). Among them, starting the pump so that the raw water is filtered through the RO membrane module and then refluxed back to the pre-PPC composite filter element for temporary storage through the pure water reflux valve (5) can be achieved in the following three ways: Method 1: Start the pump to allow the raw water to be filtered through the RO membrane module and then directly returned to the pre-filter PPC composite filter cartridge for temporary storage via the pure water return valve (5). Figure 3 The diagram shows the water circuit connections and valve opening / closing status of the water treatment equipment during the initial flushing and pure water storage stage. At this stage, the water circuit status changes significantly compared to the normal water production stage: inlet valve 2 and pure water outlet valve 4 are closed, reflux control valve 1 and pure water return valve 5 are opened, and the pump is started. Specifically, inlet valve 2 (marked v / v #2) and pure water outlet valve (marked v / v #4) are closed, cutting off the user's water supply, while reflux control valve 1 (marked v / v #1) and pure water return valve 5 (marked v / v #5) are open, keeping the pump running. This creates a pure water circulation loop. The pump drives the water circulation through the RO membrane to produce pure water. Because the pure water valve is closed, this pure water cannot flow out and can only return through the pure water return valve 5. The returned pure water is not directly discharged but is guided to the pre-filter PPC composite filter for storage. This design cleverly utilizes the existing filter components of the equipment as a temporary water storage container, eliminating the need for an additional water tank and simplifying the structure. The stored pure water is of excellent quality, laying the foundation for subsequent deep rinsing.

[0024] Method 2: Start the pump to allow the raw water to pass through the RO membrane module and the post-CB filter cartridge in sequence, and then all of it is returned to the pre-PPC composite filter cartridge for temporary storage via the pure water return valve 5. Figure 4 As shown. With Figure 3 The difference is that the pure water produced by the RO membrane module is not directly returned to the pre-PPC composite filter element through the pure water return valve 5 and stored therein. Instead, after being filtered by the post-CB filter element, it is all returned to the pre-PPC composite filter element through the pure water return valve 5 for temporary storage.

[0025] Method 3: Start the pump so that the raw water passes through the RO membrane module and the post-CB filter element, and then part of it is returned to the pre-PPC composite filter element for temporary storage via the pure water return valve (5). Figure 5 As shown above. Figure 3 and Figure 4 Unlike waterways, in Figure 5 In the example water circuit, while the reflux control valve 1 and the pure water reflux valve 5 are open, an additional mixing valve 6 is also opened. Figure 5 (marked as v / v #6). Thus, the pure water produced by the RO membrane module, after being filtered by the post-CB filter, is partially returned via the pure water return valve 5 and stored in the pre-PPC composite filter, while the other part is mixed with tap water via the mixing valve 6. This mixed water has moderate cleaning power and fluidity, allowing for pre-wetting and initial rinsing of the RO membrane channels, thereby improving the efficiency and effectiveness of the entire pretreatment process.

[0026] S102-2: Wastewater Valve Rush Stage. After storing pure water, it is necessary to forcefully remove the extremely high concentration of residual brine from the high-pressure side (wastewater side) of the RO membrane. This can be achieved through methods such as... Figure 6 The stage of explosive flushing of wastewater valve is achieved as shown. Figure 4 The diagram illustrates the water circuit connections and valve opening / closing status of the water treatment equipment during the initial flushing-flushing wastewater valve stage. This stage involves a brief but intense flushing action: closing the reflux control valve 1, inlet valve 2, pure water outlet valve 4, and pure water reflux valve 5, fully opening the wastewater valve 3, and starting the pump. The diagram clearly shows this state: all inlet and reflux water paths are closed (i.e., valves marked v / v #1, v / v ##2, v / v ##4, and v / v ##5 are closed), while wastewater valve 3 is fully open. The pump starts at full power at this time. Due to the closed outlet path, the high pressure built up by the pump before the RO membrane module is instantly released upon encountering the fully open wastewater valve, forming a high-speed, high-flow-rate water jet. This water jet forces the high-concentration wastewater out of the RO membrane module with extremely high shear force, thoroughly flushing out the salt residue remaining in the membrane housing and channels due to concentration polarization from the system.

[0027] S102-3: RO Membrane Rinse Stage. After the initial flush, the RO membrane surface needs to be rinsed with a final high-flow-rate rinse using clean water. This stage is as follows: Figure 7 As shown. Figure 7The diagram illustrates the water circuit connections and valve opening / closing states of the water treatment equipment during the initial cup flushing-RO membrane flushing stage: Backflow control valve 1, pure water outlet valve 4, and pure water return valve 5 are closed; the pump is turned off; and inlet valve 2 and wastewater valve 3 are opened. At this time, the booster pump stops operating, and the water treatment equipment utilizes the natural pressure of the municipal water supply. Inlet valve 2 is open, and municipal water flows in under the pressure of the municipal water network. This water flow propels the pure water previously stored in the pre-filter PPC composite cartridge forward, causing it to flow into the RO membrane module. The pressure difference pushes the pure water stored in the pre-filter PPC composite cartridge forward to flush the RO membrane module. The flushed wastewater is discharged through the open wastewater valve 3. This hydrostatic flushing method has extremely low energy consumption and effectively replaces residual ions on the membrane surface.

[0028] To further improve the rinsing effect, an optimized water circuit diagram for the RO membrane rinsing stage is shown below. Figure 8 As shown. Compared to Figure 7 This optimized solution adds a mixing valve 6 and a recirculation valve 7. The implementation is as follows: The recirculation control valve 1, pure water outlet valve 4, pure water recirculation valve 5, and mixing valve 6 are closed. Simultaneously, the pump is started, and the inlet valve 2 and recirculation valve 7 are opened. The natural pressure of the tap water pushes the pure water temporarily stored in the pre-filter PPC composite cartridge into the RO membrane module to flush it. The pure water is then returned to the pump inlet via the recirculation valve 7. In this way, the water treatment equipment not only uses tap water pressure to flush the stored pure water, but also the fresh pure water generated after the pump starts flows back to the pump and mixes with the inlet water, forming a circulating flushing loop. This dynamic circulating flushing continuously provides a cleaner flushing water source and generates a certain amount of turbulence, thereby enhancing the flushing effect on the RO membrane surface, especially beneficial for removing highly adhesive contaminants.

[0029] As can be seen from the above embodiments, although the pure water storage stage, the flushing wastewater valve stage, and the RO membrane flushing stage are executed sequentially—that is, the pure water storage stage first stores high-quality flushing water for the RO membrane flushing stage, then the flushing wastewater valve stage powerfully removes high-concentration wastewater from the RO membrane to create clean conditions for flushing, and finally, the stored pure water is used to complete the final purification in the RO membrane flushing stage—it should be noted that the switching between each stage can be automatically controlled by the control unit based on preset conditions. For example, when the pure water storage stage reaches a preset time or water volume, the system automatically enters the flushing wastewater valve stage; after the flushing wastewater valve stage is completed, the system enters the RO membrane flushing stage.

[0030] Step S103: Standby step: Close the control valve and pump to put the water treatment equipment into standby mode.

[0031] After completing all water production or flushing tasks, the water treatment equipment enters a standby phase. At this time, the control unit issues a command to shut down all control valves and pumps, bringing the water system to a static, low-pressure state. This helps save energy, reduces component wear, and awaits the next user water usage command or scheduled flushing command.

[0032] Step S104: Intelligent adjustment step: Based on the pH monitoring results provided by the pH colorimetric module, the control unit dynamically adjusts the mineralization parameters and rinsing parameters.

[0033] The intelligence of this application is reflected in its adaptive adjustment capability based on water quality feedback. This step dynamically adjusts mineralization and flushing parameters based on pH monitoring results. Mineralization parameters refer to variables controlling the rate and dosage of minerals released into the water by the mineralization filter cartridge. Specifically, these may include the opening duration or degree of the mineralization water valve (A6) (controlling the contact time between the water flow and the mineralization material) and the water flow velocity in the mineralization water path. Flushing parameters refer to variables controlling the execution method of the first-cup water pretreatment step (or its sub-stages). Specifically, these may include the triggering conditions for the flushing action (e.g., standby time, cumulative water production, or a pH / TDS threshold), flushing frequency (i.e., the number of times a complete first-cup water pretreatment is performed per unit time), and the intensity or duration of a specific stage, etc. The intensity or duration of a specific stage can be the duration of the flushing wastewater valve stage or the pump power, or the duration of the RO membrane flushing stage or the circulating water volume. Specifically, intelligent adjustment can employ a mixed indicator colorimetric method. This mixed indicator contains methyl red, bromocresol green, and thymol blue. The color change ranges of these three indicators (methyl red: pH 4.4-6.2, red-yellow; bromocresol green: pH 3.6-5.4, yellow-green; thymol blue: pH 6.7-7.5, yellow-blue) are carefully proportioned to form a continuous color gradation from red to blue, covering the pH range of 1-14. Compared to single indicators or test strips with discontinuous color change ranges, this mixed indicator can more intuitively and continuously reflect subtle changes in water quality's pH, providing a reliable basis for precise adjustments.

[0034] In another embodiment of this application, based on the pH monitoring results provided by the pH colorimetric module, the control unit dynamically adjusts the mineralization parameters and rinsing parameters by: comparing the pH monitoring results with a preset target pH range; if the pH monitoring results are consistently below the lower limit of the target range, a first adjustment command is generated, which is used to enhance the mineralization effect (e.g., increasing the opening degree of the mineralization water valve A6 or extending its opening time, or increasing the flow rate of the mineralization water path); if the pH monitoring results are consistently above the upper limit of the target range, a second adjustment command is generated, which is used to weaken the mineralization effect (e.g., reducing the opening degree of the mineralization water valve A6 or shortening its opening time). (Time); If the pH monitoring result fluctuates too much or deviates from the target range in a short period of time, a third adjustment command is generated. This third adjustment command is used to trigger or enhance the flushing action (e.g., immediately trigger a first cup water pretreatment step, or shorten the waiting time for the next flush, or extend the duration of the "flushing RO membrane stage"); The control unit receives and executes the first adjustment command, the second adjustment command, or the third adjustment command, and accordingly drives the mineralization water valve A6 to change its state to adjust the mineralization parameters and / or drives the inlet valve 2, wastewater valve 3, reflux control valve 1, pure water reflux valve 5, circulation reflux valve 7, and pump to perform or adjust the flushing parameters of the first cup water pretreatment step.

[0035] After obtaining intuitive pH color information through the mixed indicator color development method, this application can further realize the digitization and automation of monitoring. Specifically, pH monitoring is achieved through an automatic color recognition system, including scanning the color with a mobile phone or using a color sensor integrated into the faucet to convert the color signal into a digital pH value. Specifically, the user-end application (APP) uses a camera to capture an image of the water sample or test strip after the mixed indicator color development. The APP's built-in image processing algorithm extracts the RGB values ​​of the characteristic areas in the image, compares and calculates them with a pre-stored, calibrated pH-color database, converts the color signal into a digital pH value, and displays it on the mobile phone screen. This method utilizes widely available smart devices to achieve high-precision digital readings at low cost. A more integrated faucet-integrated color sensor solution is also available. Figure 9As shown, a color sensor is built into or near the faucet controlled by either the domestic water valve (A4) or the mineralization water valve (A6). When water flows through, the color sensor automatically captures the color signal measured by the mixed indicator colorimetric method, converts the color signal into a digital pH value, and transmits it to the control unit of the water treatment equipment for processing and display. This method achieves seamless, real-time water quality monitoring, resulting in a better user experience. After obtaining the accurate digital pH value, the control unit can make intelligent decisions, automatically adjusting the release rate of the mineralization filter cartridge installed after the RO membrane module based on this value. For example, when the effluent pH is detected to be consistently lower than the set target (e.g., pH 7.5), the control unit can adjust the flow rate of the mineralization water path or extend the contact time between the water flow and the mineralization filter media to increase the dissolution of alkaline minerals, thereby proactively and accurately adjusting the effluent pH to the ideal range. This constitutes a complete monitoring-feedback-regulation closed loop, ensuring long-term water quality stability.

[0036] Effective pretreatment of raw water is crucial before it enters the core RO filtration process. Prior to the normal water purification steps, a water pretreatment step is included: filtering the raw water through a charged membrane to remove impurities, organic matter, heavy metals, and bacteria and viruses, while retaining beneficial minerals. Specifically, the charged membrane can be a positively charged microfiltration or ultrafiltration membrane. The principle is that the positive charge on the membrane surface electrostatically adsorbs negatively charged colloids, organic matter, bacteria, and viruses in the water, thereby enhancing the retention of these pollutants on top of the existing pore size sieving. Crucially, the charged membrane has a very low retention rate for beneficial minerals existing in ionic form (e.g., calcium, magnesium, potassium), thus efficiently removing harmful substances while retaining most of these beneficial mineral components, providing a good and controllable water quality foundation for subsequent potential mineralization treatments.

[0037] This application also provides a method with Figure 1 The example water treatment equipment control method corresponds to a water treatment device whose basic components include a water circuit system, a filter system, a control system, and a monitoring system. The core of the water circuit system consists of control valves, an RO membrane module, a pre-filter PPC composite filter, a post-filter CB filter, and a pump. The control valves include a reflux control valve 1, an inlet valve 2, a pure water outlet valve 4, and a pure water reflux valve 5. In other embodiments, the water treatment equipment also includes a domestic water valve A4 or a mineralization water valve A6. These valves are preferably fast-responding, well-sealed solenoid valves or electric proportional valves, driven by a control unit. The filter system includes at least an RO membrane module, a pre-filter PPC composite filter, and optional mineralization filters, among which the RO membrane module is the core for achieving deep desalination. Furthermore, the RO membrane module can be a hybrid RO, NF, or UF membrane structure, and the system desalination rate can be dynamically adjusted by regulating the booster pump pressure and the wastewater valve opening. This is an innovative membrane element design.

[0038] In the above embodiment, the inlet of the inlet valve 2 is connected to the raw water input, the outlet of the pump is connected to the inlet of the RO membrane module, the pure water outlet of the RO membrane module is connected to the inlet of the pure water outlet valve 4 after the post-CB filter, the outlet of the pure water outlet valve 4 is connected to the outlet terminal, the wastewater outlet of the RO membrane module is connected to the inlet of the wastewater valve 3, the post-CB filter is installed in the water path between the pure water outlet of the RO membrane module and the outlet of the pure water outlet valve 4, the pure water reflux valve 5 is connected between the pure water outlet of the RO membrane module and the inlet of the PPC filter, and the reflux control valve 1 is connected to the bypass pipeline between the raw water input and the pump inlet; the reflux control valve 1, the inlet valve 2, the pure water outlet valve 4, the pure water reflux valve 5, and the pump are used for normal water production, including: opening the inlet valve 2 and the pure water... The outlet valve 4 starts the pump and closes the reflux control valve 1 and the pure water reflux valve 5, so that the raw water is filtered through the RO membrane module and then discharged from the pure water outlet valve 4 for user use; the reflux control valve 1, the inlet valve 2, the pure water outlet valve 4 and the pure water reflux valve 5 are used for the first cup water pretreatment, which includes the pure water storage stage, the wastewater flushing stage and the RO membrane flushing stage in sequence; the RO membrane module is used to filter the raw water and / or the pure water temporarily stored in the pre-filter PPC composite filter element; the pre-filter PPC composite filter element is used to temporarily store the pure water that flows out from the pure water reflux valve (5) after being filtered by the RO membrane module; the pump is used to provide water pressure during normal water production and first cup water pretreatment; the pH colorimetric module is used to detect the pH value of the water discharged from the pure water outlet valve (4); the control unit is configured to execute the control method of the water treatment equipment.

[0039] In practice, reverse osmosis (RO), nanofiltration (NF), and / or ultrafiltration (UF) membranes are wound concentrically or segmentally onto a central tube in a specific area ratio to form a composite membrane element. Since the desalination rates of RO, NF, and UF membranes decrease sequentially, the proportion and efficiency of water flow through different membrane regions can be substantially altered by adjusting the booster pump pressure (changing the driving force) and the wastewater valve opening (changing the concentrate flow rate and concentration polarization). This allows for dynamic adjustment of a wide range of desalination rates (e.g., from 60% to 98%) on a single membrane element. This enables a single water treatment system to produce water ranging from partially mineral-retaining purified water to almost completely pure water, meeting diverse application needs.

[0040] To adjust the taste and mineral content of the effluent, the equipment can be equipped with a mineralizing filter cartridge. In one specific embodiment of this application, the mineralizing filter cartridge can adopt a multi-stage structure, including a slow-release chamber and a mineralizing chamber, separated by a stop valve to inhibit excessive mineral release. Figure 10In the example of the multi-stage mineralization filter structure, water first enters the "mineralization chamber," which is filled with highly soluble minerals, for initial mineralization. When the solution concentration in the chamber reaches a certain value, the stop valve in the middle section opens, and the concentrated solution enters the "slow-release chamber," which is filled with low-soluble slow-release substances, for dilution and secondary equilibration. This two-stage buffer design effectively suppresses excessive mineral release, avoiding the problem of excessively high mineral concentration in the initial effluent followed by excessively low concentration, resulting in a smoother and more sustained release of minerals.

[0041] Compared to Figure 10 , Figure 11 An example of a simpler single-stage mineralization filter cartridge structure is presented. Figure 11 In one chamber of the example single-stage mineralization filter cartridge, a large-volume mineralization zone and a small-volume slow-release buffer zone are divided by physical partitions or filling. A large volume ratio (greater than 5:1) ensures that most of the water is in full contact with the mineralizing material, achieving a stable mineralization effect, while the presence of the small-volume buffer smooths out concentration fluctuations. This design reduces structural complexity while maintaining effectiveness.

[0042] The pH colorimetric module, as the intelligent sensing unit of this application, can be implemented in various forms. In one embodiment, the pH colorimetric module is in the form of a test strip. The matrix of the test strip is made of modified cellulose, and the indicator molecules are covalently linked to the hydroxyl groups of the fiber matrix to form a stable "indicator-fiber" complex that supports repeated use. Here, the modified cellulose can specifically be chemically treated cellulose materials such as carboxymethyl cellulose and hydroxyethyl cellulose, whose surfaces are rich in more or more active hydroxyl (-OH) functional groups. During preparation, the active groups (e.g., sulfonic acid groups, carboxyl groups) of the mixed indicators (methyl red, bromocresol green, thymol blue) undergo a covalent bonding reaction with the hydroxyl groups of cellulose under the action of a condensing agent. This covalent bonding method, compared to the traditional test strip where the indicator is only physically adsorbed, has extremely strong binding force, effectively preventing the indicator from being dissolved or washed away by water during use, thus truly achieving support for repeated use. This not only reduces user costs but also improves the consistency of monitoring. Besides test strips, pH colorimetric modules can also be in reagent form, employing either a separate or integrated design. Integrated designs include squeeze-type or press-type structures. The core of the reagent form is the preparation of a solution from the mixed indicator. In the separate design, the indicator reagent is independently packaged in a reagent bottle or ampoule, requiring manual addition by the user to the water sample, a relatively traditional but flexible operation. In the integrated design, the indicator solution is sealed within a flexible cavity integrated with a miniature test cell or flow cell. The user simply squeezes the cavity, and the indicator is quantitatively injected into the test cell and mixed with the water sample, greatly simplifying the user experience.

[0043] The water treatment equipment illustrated in this application may also include a degassing unit, which is an important pretreatment unit to ensure the stability of subsequent mineralization or electrolysis. This unit is typically located after the RO filter and before the mineralization filter or electrolyzer. Its function is to remove dissolved carbon dioxide from the water. In specific implementations, vacuum degassing or membrane contact degassing technologies can be used. For example, a vacuum degassing device sprays water into a low-pressure container or forms a thin film, using the pressure difference to force dissolved gases such as carbon dioxide to escape and be drawn away by a vacuum pump. Membrane degassing utilizes a hydrophobic hollow fiber membrane, with water flowing on one side of the membrane and vacuum or purge gas on the other side, removing dissolved gases through the membrane pores.

[0044] After degassing, the carbon dioxide content in the water can be reduced to a very low level (e.g., <1 mg / L), thus avoiding the problem of weak pH increase caused by the reaction of alkaline minerals with carbon dioxide to form bicarbonate during subsequent mineralization, ensuring the stability and predictability of the mineralization effect. To further optimize the quality of the first cup water, this application also makes detailed improvements to the RO membrane module, namely: a structural component or stop valve to reduce water volume is installed in the central tube of the RO membrane module. In traditional RO membrane elements, there is a certain cavity volume inside the central tube. When the equipment is shut down, this part of the water cannot be replaced, becoming one of the sources of high TDS "dead water". This application reduces the water volume by implanting a solid filling rod, spiral guide plate, or other structural component in the central tube, or by installing a one-way stop valve inside the outlet end of the central tube. The filling structural component directly occupies part of the volume; while the stop valve allows pure water to flow out during water production and closes to prevent concentrated water backflow when the equipment is shut down. Both methods effectively reduce the amount of water retained in the central tube, thus significantly reducing the amount of contaminated water in the head cup when the equipment restarts, allowing the output water quality to reach a stable and pure state more quickly.

[0045] Finally, this application uses a coffee-specific water purifier as an example of a water treatment device to briefly illustrate the water treatment equipment. For this purpose, the coffee-specific water purifier features a specially designed filter assembly, such as... Figure 12 The image shown is a cross-sectional view of a filter element for a coffee-specific water purifier provided in an embodiment of this application, comprising magnesium balls and acidic resin, as detailed below: 1) Magnesium spheres: These are typically natural mineral spheres (e.g., magnesium tourmaline) or sintered bodies rich in magnesium ions. Their main function is to slowly release magnesium ions, adjusting the magnesium content in the brewed water to around 20 ppm. Magnesium ions are considered one of the key minerals for enhancing the sweetness and body of coffee.

[0046] 2) Acidic Resin: Typically a hydrogen-form weakly acidic cation exchange resin. Its main function is to replace some of the alkaline metal ions (e.g., calcium, magnesium) in the water and release hydrogen ions. This reduces and stabilizes the alkalinity of the water while maintaining a certain total hardness (mainly calcium hardness), preventing it from becoming too high and excessively buffering the acidic flavor compounds in coffee. Through precise proportioning and combination of magnesium balls and acidic resin, and synergistic control of the desalination rate of the pre-RO system (e.g., using the aforementioned mixed-winding membrane adjustment), a coffee-specific water purifier can stably produce water that meets SCA standards: pH 6-8, hardness (as calcium carbonate) 50-175 ppm, and alkalinity 40-70 ppm. This water quality maximizes the balanced extraction of flavor compounds in coffee, avoiding excessive acidity or bitterness and significantly improving coffee quality.

[0047] Finally, a brief description of the control unit mentioned in the above embodiments is provided. The control unit of this application is essentially the "brain" that coordinates all the aforementioned hardware components and executes the control methods of the water treatment equipment. It is typically a circuit board with a microprocessor (MCU) at its core, integrating a power module, signal input / output module, memory, and communication module. The control unit's software program embeds multiple control logic subroutines, including normal water production and first-cup water pretreatment. The control unit receives signals from flow sensors, pressure sensors, and pH sensors (or color recognition modules), and precisely controls the opening and closing of each valve and the start and stop of the pump based on preset logic and real-time water quality feedback. For example, it can be set to automatically trigger a complete first-cup water pretreatment step after the equipment has been idle for more than 2 hours, or it can automatically execute this pretreatment step before each user takes water, ensuring a consistently high-quality water supply.

[0048] From the above appendix Figure 1As can be seen from the control method of the example water treatment equipment, on the one hand, by refining the first-cup water treatment into a multi-stage pretreatment process including storing pure water, flushing wastewater valves, and rinsing the RO membrane, and using specific valve combinations to control each stage, a deep and thorough cleaning of the RO membrane system is achieved. This multi-stage coordinated rinsing method ensures that contaminants on the RO membrane surface are effectively removed, thereby reliably guaranteeing the desalination rate of the first-cup water when the equipment restarts. On the other hand, by introducing a pH colorimetric module and organically integrating it with the water purification control process, real-time monitoring and intelligent adjustment of the effluent water quality are achieved. The pH colorimetric module uses mixed indicators to form continuous color levels, which can intuitively reflect the water quality. Reflecting changes in water pH, the control unit dynamically adjusts mineralization and flushing parameters based on pH monitoring results. This closed-loop control mechanism ensures the stability of the effluent water quality. Thirdly, by optimizing valve control and pump operation strategies at each stage, unnecessary water waste is effectively reduced while ensuring flushing effectiveness. Particularly during the RO membrane flushing stage, low-energy, high-efficiency flushing is achieved by rationally utilizing tap water pressure and stored pure water. Furthermore, the modular design organically integrates pH monitoring, mineralization adjustment, and RO membrane flushing functions, enabling the equipment to adapt to different water quality environments and usage requirements. This flexibility and adaptability enhance the product's market competitiveness. In summary, the technical solution of this application significantly improves the desalination rate of the first cup water and achieves stable water quality control through multi-stage intelligent flushing and real-time pH monitoring and adjustment, while simultaneously optimizing water resource utilization efficiency.

[0049] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0050] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A control method for a water treatment device, characterized in that, The method is used to control a water treatment device, which includes: a control valve, an RO membrane module, a pre-filter PPC composite filter, a post-filter CB filter, a pH colorimetric module, a pump, and a control unit. The control valve includes a reflux control valve (1), an inlet valve (2), a pure water outlet valve (4), and a pure water reflux valve (5). The inlet of the inlet valve (2) is connected to the raw water input, the outlet of the pump is connected to the inlet of the RO membrane module, and the pure water outlet of the RO membrane module is connected to the pure water outlet after the post-filter CB filter. The inlet of the outlet valve (4) is connected to the outlet terminal, the outlet of the pure water outlet valve (4) is connected to the inlet of the wastewater valve (3), the post-CB filter element is set in the water path between the pure water outlet of the RO membrane element and the outlet of the pure water outlet valve (4), the pure water return valve (5) is connected between the pure water outlet of the RO membrane element and the inlet of the PPC filter element, and the return control valve (1) is connected to the bypass pipeline between the raw water input and the inlet of the pump. The method includes the following steps: Normal water production steps: Open the inlet valve (2) and the pure water outlet valve (4), start the pump, close the reflux control valve (1) and the pure water reflux valve (5), so that the raw water is filtered through the RO membrane module and then discharged from the pure water outlet valve (4) for user use; The first cup water pretreatment steps include, in sequence, the pure water storage stage, the wastewater flushing stage, and the RO membrane flushing stage; Standby procedure: Close the control valve and pump to put the water treatment equipment into standby mode; Intelligent adjustment steps: Based on the pH monitoring results provided by the pH colorimetric module, the control unit dynamically adjusts the mineralization parameters and rinsing parameters.

2. The control method for the water treatment equipment as described in claim 1, characterized in that, The water treatment equipment also includes a wastewater valve (3). The water storage stage in the first cup water pretreatment step includes: closing the inlet valve (2) and the pure water outlet valve (4), opening the reflux control valve (1) and the pure water reflux valve (5), and starting the pump so that the raw water is filtered by the RO membrane module and then refluxed back to the pre-filter PPC composite filter element for temporary storage through the pure water reflux valve (5). The wastewater valve flushing stage in the first cup water pretreatment step includes: closing the reflux control valve (1), the inlet valve (2), the pure water outlet valve (4) and the pure water reflux valve (5), fully opening the wastewater valve (3) and starting the pump to forcibly discharge the high-concentration wastewater in the RO membrane module at the maximum flow rate; The RO membrane rinsing stage in the first cup water pretreatment step includes closing the reflux control valve (1), the pure water outlet valve (4), the pure water return valve (5) and the pump, opening the inlet valve (2) and the wastewater valve (3), and using the natural pressure of tap water to push the pure water temporarily stored in the pre-filter PPC composite filter cartridge to rinse the RO membrane assembly.

3. The control method for the water treatment equipment as described in claim 2, characterized in that, The process of starting the pump to allow raw water to be filtered through the RO membrane module and then returned to the pre-PPC composite filter element for temporary storage via the pure water return valve (5) includes: The pump is started so that the raw water, after being filtered by the RO membrane module, flows directly back to the pre-PPC composite filter element for temporary storage via the pure water return valve (5); or The pump is started so that the raw water is filtered through the RO membrane module and the post-CB filter element, and then all of it is returned to the pre-PPC composite filter element for temporary storage via the pure water return valve (5); or The pump is started so that the raw water is filtered through the RO membrane module and the post-CB filter element, and then part of it is returned to the pre-PPC composite filter element for temporary storage through the pure water return valve (5).

4. The control method for the water treatment equipment as described in claim 2, characterized in that, The water treatment equipment also includes a mixing valve (6) and a circulation return valve (7). The RO membrane rinsing stage in the first cup water pretreatment step includes closing the return control valve (1), the pure water outlet valve (4), the pure water return valve (5), and the mixing valve (6), opening the inlet valve (2) and the circulation return valve (7), and starting the pump. The pure water temporarily stored in the pre-filter PPC composite filter element is pushed in by the natural pressure of tap water to rinse the RO membrane assembly, and the pure water is returned to the pump inlet through the circulation return valve (7) to enhance the rinsing effect on the RO membrane surface.

5. The control method for the water treatment equipment as described in claim 1, characterized in that, The water treatment equipment also includes a domestic water valve (A4) or a mineralized water valve (A6). The pH monitoring in the intelligent adjustment step adopts a mixed indicator colorimetric method. The mixed indicator contains methyl red, bromocresol green and thymol blue, forming a continuous color scale from red to blue, covering the pH range of 1 to 14. The pH colorimetric module is implemented through an automatic color recognition system, which includes scanning the color of the faucet via an intelligent electronic device or an integrated color sensor controlled by the domestic water valve (A4) or mineral water valve (A6), converting the color signal measured by the mixed indicator colorimetric method into a digital pH value, and automatically adjusting the release rate of the mineral filter cartridge installed after the RO membrane assembly based on the digital pH value.

6. A water treatment device, characterized in that, The water treatment equipment includes control valves, an RO membrane module, a pre-filter PPC composite filter, a post-filter CB filter, a pH colorimetric module, a pump, and a control unit. The control valves include a reflux control valve (1), an inlet valve (2), a pure water outlet valve (4), and a pure water reflux valve (5). The inlet of the inlet valve (2) is connected to the raw water input, and the outlet of the pump is connected to the inlet of the RO membrane module. The pure water outlet of the RO membrane module is connected to the inlet of the pure water outlet valve (4) after the post-filter CB filter. The outlet of the pure water outlet valve (4) is connected to the water outlet terminal, the wastewater outlet of the RO membrane module is connected to the inlet of the wastewater valve (3), the post-CB filter element is set in the water path between the pure water outlet of the RO membrane module and the outlet of the pure water outlet valve (4), the pure water reflux valve (5) is connected between the pure water outlet of the RO membrane module and the inlet of the PPC filter element, and the reflux control valve (1) is connected to the bypass pipeline between the raw water input and the inlet of the pump; The reflux control valve (1), inlet valve (2), pure water outlet valve (4), pure water reflux valve (5) and pump are used for normal water production, including: opening the inlet valve (2) and pure water outlet valve (4), starting the pump, closing the reflux control valve (1) and pure water reflux valve (5), so that the raw water is filtered through the RO membrane module and then discharged from the pure water outlet valve (4) for user use; The reflux control valve (1), inlet valve (2), pure water outlet valve (4) and pure water reflux valve (5) are used for the pretreatment of the first cup water, which includes the pure water storage stage, the wastewater flushing stage and the RO membrane flushing stage in sequence. The RO membrane module is used to filter raw water and / or pure water temporarily stored in the pre-PPC composite filter element; The pre-filter PPC composite filter element is used to temporarily store the pure water that flows out from the pure water return valve (5) after being filtered by the RO membrane module; The pump is used to provide water pressure during the normal water production and first-cup water pretreatment processes. The pH colorimetric module is used to detect the pH value of the water discharged from the pure water outlet valve (4); The control unit is configured to perform the control method of the water treatment device as described in any one of claims 1 to 5.

7. The water treatment equipment as described in claim 6, characterized in that, The RO membrane module is a hybrid RO, NF or UF membrane structure. By adjusting the pressure of the booster pump and the opening of the wastewater valve (3), the desalination rate of the first cup water of the water treatment equipment can be dynamically adjusted.

8. The water treatment equipment as described in claim 6, characterized in that, The water treatment equipment also includes a domestic water valve (A4) or a mineralized water valve (A6). The pH colorimetric module is implemented through an automatic color recognition system, which includes scanning the color with a mobile phone or using a faucet integrated with the domestic water valve (A4) or the mineralized water valve (A6) to convert the color signal measured by the mixed indicator colorimetric method into a digital pH value, and automatically adjusting the release rate of the mineralized filter cartridge installed after the RO membrane module based on the digital pH value.

9. The water treatment equipment as described in claim 6, characterized in that, The RO membrane module has a structural component or stop valve inside the central tube to reduce water volume, thereby lowering the concentration of water in the first cup and improving the desalination rate.

10. The water treatment equipment as described in claim 6, characterized in that, The water treatment equipment is a coffee-specific water purifier, which includes magnesium balls and acidic resin. The pH value of the water purifier is 6-8, the hardness is 50-175 ppm, the alkalinity is 40-70 ppm, and the magnesium content is 15-25 ppm.

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