Integrated device for microbial contamination control in seawater desalination systems

Abstract

This invention provides an integrated device for controlling microbial contamination in seawater desalination, comprising a base, a high-pressure pump mounted on the left side of the base, an online flow cytometer system mounted on the base, and an RO membrane holder mounted on the right side of the base. The base facilitates the installation of the dosing mechanism, diaphragm pump, and online flow cytometer system. The high-pressure pump pressurizes and delivers seawater for subsequent desalination via the RO membrane. The online flow cytometer system monitors the microorganisms in the seawater delivered by the high-pressure pump and simultaneously controls the diaphragm pump to deliver the bactericide from the dosing mechanism upstream of the cartridge filter, sterilizing the seawater entering the RO membrane and thus extending the cleaning cycle and lifespan of the RO membrane.

Description

Technical Field

[0001] This invention relates to the field of seawater desalination technology, specifically to an integrated device for controlling microbial contamination in seawater desalination. Background Technology

[0002] Seawater desalination, which involves desalinating seawater to produce fresh water, is an incremental technology for utilizing water resources. It can increase the total amount of fresh water and is not affected by time, space, or climate, thus ensuring a stable water supply for coastal residents' drinking water and industrial boiler feedwater.

[0003] RO membranes are often used in seawater desalination. In actual use, seawater contains a large number of microorganisms, leading to frequent chemical cleaning of the RO membrane system. Since the RO membrane system cannot be sterilized by oxidizing substances, bactericides are needed to remove microbial contamination. Because the main contaminating microbial communities are unknown, it is difficult to prepare or find corresponding bactericides. Bactericides are usually expensive, and continuous addition or excessive dosage will lead to a significant increase in operating costs. Knowing the main microbial communities in different water quality systems can provide a good indication for screening corresponding effective bactericides.

[0004] To address this, a system is proposed that can quantitatively adjust the dosage of bactericide, thereby significantly optimizing the dosage of bactericide while effectively controlling membrane fouling in the RO system. Summary of the Invention

[0005] The present invention aims to solve the problems mentioned in the background art and provides an integrated device for controlling microbial pollution in seawater desalination.

[0006] According to an embodiment of the present invention, an integrated device for controlling microbial contamination in seawater desalination is provided, comprising a base, a high-pressure pump disposed on the left side of the base, an online flow cytometer system disposed on the base, an RO membrane frame disposed on the right side of the base, uniformly distributed RO membranes fixedly installed inside the RO membrane frame, a high-pressure membrane inlet pipe disposed on the rear side of the base and the RO membrane frame, a diaphragm pump fixedly installed on the top of the base and in front of the online flow cytometer system, a dosing mechanism disposed on the top of the base and in front of the high-pressure pump, and the high-pressure membrane inlet pipe being connected to the output end of the high-pressure pump;

[0007] The dosing mechanism includes a dosing tank fixedly installed on the top of the base and a connecting pipe connected to the bottom of the dosing tank. The right side of the connecting pipe is connected to the input end of the diaphragm pump, and a Y-type filter is fixedly installed inside the connecting pipe.

[0008] As a preferred embodiment of the present invention, a mounting plate is fixedly installed on the top of the dosing tank, a motor is fixedly installed on the top of the mounting plate, the output shaft of the motor passes through the interior of the dosing tank and a transmission rod is fixedly installed thereon, and stirring rods are fixedly installed on both sides of the transmission rod and inside the dosing tank.

[0009] As a preferred embodiment of the present invention, a permeate header is fixedly installed on the front side of the RO membrane, and an inlet header is fixedly installed on the rear side of the RO membrane. The rear side of the inlet header is connected to the high-pressure membrane inlet pipe, and the RO concentrate header is connected to the outflow pipe.

[0010] As a preferred embodiment of the present invention, the outlet of the diaphragm pump is connected to a dosing pipe, and the end of the dosing pipe is connected to the upstream of the cartridge filter.

[0011] As a preferred embodiment of the present invention, the input end of the high-pressure pump is connected to a core-type filter.

[0012] As a preferred embodiment of the present invention, the rear side of the online flow cytometer system is connected to the high-pressure membrane inlet pipe via a fourth conduit.

[0013] As a preferred embodiment of the present invention, a transparent acrylic liquid level observation window is embedded and fixed in the side wall of the dosing tank. The surface of the liquid level observation window is engraved with capacity scale lines. At the same time, a magnetic float liquid level gauge with remote transmission is provided, which can remotely control the replenishment of medicine and control the liquid level.

[0014] According to another embodiment of the present invention, an integrated device for controlling microbial contamination in seawater desalination is provided, comprising an online flow cytometer system, a diaphragm pump, and a dosing mechanism. The dosing mechanism is in fluid communication with the diaphragm pump, the diaphragm pump is connected to an upstream pipeline of a cartridge filter, and the online flow cytometer system is connected to a pipeline between a high-pressure pump and an RO membrane device and is used to control the operation of the diaphragm pump.

[0015] As a preferred embodiment of the present invention, the diaphragm pump is a mechanical diaphragm pump or a hydraulic diaphragm pump.

[0016] As a preferred embodiment of the present invention, the dosing mechanism includes a dosing tank and a Y-type filter, wherein the dosing tank is in fluid communication with a diaphragm pump through the Y-type filter.

[0017] The present invention has the following beneficial effects:

[0018] 1. Integrated design simplifies the layout process and improves operational convenience and space utilization:

[0019] This device integrates core components such as the high-pressure pump, dosing mechanism, RO membrane frame, online flow cytometer system, and diaphragm pump into a single unit via a base. Compared to the dispersed equipment and complex piping connections in traditional seawater desalination systems, this device eliminates the need for separate installation points for each piece of equipment, significantly simplifying on-site installation and piping laying processes, reducing installation difficulty and construction costs. Furthermore, the integrated design effectively saves space, making it suitable for desalination scenarios with limited space, such as ships, islands, and small water plants. The rational layout of each component facilitates daily inspection and maintenance by operators, enhancing overall operational convenience.

[0020] 2. Precise microbial monitoring + coordinated sterilization ensures efficient prevention and control, protecting the RO membrane from the source:

[0021] The device employs an online flow cytometer system linked with a diaphragm pump and a dosing mechanism. The online flow cytometer system extracts seawater from the high-pressure membrane inlet pipe in real time via a fourth conduit, precisely monitoring the microbial content in the seawater pumped out by the high-pressure pump. This enables real-time, continuous monitoring of microbial contamination, overcoming the limitations of traditional monitoring methods that are slow. It can detect microbial contamination issues immediately. When the detected microbial content reaches a preset threshold, the online flow cytometer system immediately controls the diaphragm pump to start, pressurizing the bactericide in the dosing mechanism and delivering it through the dosing pipe into the high-pressure membrane inlet pipe, where it is thoroughly mixed with the seawater to be desalinated. Simultaneously, the dosing diaphragm pump is equipped with a frequency converter, which adjusts the frequency in real time based on the number of contaminating microorganisms measured by the online flow cytometer to precisely sterilize the seawater entering the RO membrane. This effectively controls the dosing amount, avoiding overdosing and waste. It effectively kills microorganisms in the seawater, preventing them from adhering to the RO membrane surface, multiplying, and causing RO membrane blockage and contamination. This significantly extends the RO membrane's cleaning cycle and lifespan, improves production efficiency, and reduces RO membrane replacement costs.

[0022] 3. Dual protection of sterilization and filtration ensures desalinated water quality and improves the stability of seawater desalination:

[0023] The connecting pipe of the dosing unit is equipped with a Y-type filter, which can pre-filter the bactericide that is about to be sent into the high-pressure membrane inlet pipe, remove impurities, sediments and other foreign objects from the bactericide, and prevent foreign objects from entering the high-pressure membrane inlet pipe and RO membrane with the bactericide. This not only prevents impurities from clogging the pipe, but also prevents foreign objects from scratching the surface of the RO membrane, thus further protecting the RO membrane. At the same time, the seawater after precise sterilization is distributed to each RO membrane shell through the inlet main pipe to achieve seawater desalination. The dual protection design not only ensures the stable operation of the RO membrane, but also improves the operational stability and reliability of the entire seawater desalination system. Attached Figure Description

[0024] Figure 1A schematic diagram of the integrated device for controlling microbial contamination in seawater desalination provided in an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the RO membrane structure of the integrated seawater desalination microbial contamination control device provided in an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the rear view structure of the RO membrane in the integrated seawater desalination microbial contamination control device provided in an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of the dosing mechanism of the integrated seawater desalination microbial contamination control device provided in an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of the seawater supply mechanism of the integrated seawater desalination microbial contamination control device provided in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the principle structure of the integrated device for controlling microbial pollution in seawater desalination provided in an embodiment of the present invention.

[0030] In the attached diagram: 1. Base; 2. High-pressure pump; 3. Dosing mechanism; 301. Dosing tank; 302. Mounting plate; 303. Motor; 304. Transmission rod; 305. Stirring rod; 306. Connecting pipe; 4. Core filter outlet pipe; 5. Core filter; 6. High-pressure membrane inlet pipe; 7. Dosing pipe; 8. RO membrane frame; 9. RO membrane; 10. Permeate header pipe; 11. Diaphragm pump; 12. Y-type filter; 13. Fourth conduit; 14. Inlet header pipe; 15. Online flow cytometer system. Detailed Implementation

[0031] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0033] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0034] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Example 1

[0036] The integrated device for controlling microbial contamination in seawater desalination provided in this embodiment, such as Figures 1-5 As shown, the system includes a base 1, a high-pressure pump 2 on the left side of the base 1, an online flow cytometer system 15 on the top of the base 1, an RO membrane frame 8 fixedly mounted on the right side of the base 1, and evenly distributed RO membranes 9 fixedly mounted on the RO membrane frame 8. A high-pressure membrane inlet pipe 6 is located on the top of the base 1, behind the online flow cytometer system 15 and the RO membrane frame 8. A diaphragm pump 11 is fixedly mounted on the top of the base 1, in front of the online flow cytometer system 15. A drug delivery mechanism 3 is located on the top of the base 1, to the left of the online flow cytometer system 15. The high-pressure membrane inlet pipe 6 is located on the left side of the base 1. The side is connected to the output end of the high-pressure pump 2. The base 1 is used to install the dosing mechanism 3, the diaphragm pump 11 and the online flow cytometer system 15. The high-pressure pump 2 is used to pressurize and send seawater out for subsequent desalination through the RO membrane 9. The online flow cytometer system 15 is used to monitor and monitor the microorganisms in the seawater sent out by the high-pressure pump 2. At the same time, it provides feedback control to the diaphragm pump 11 to send the bactericide inside the dosing mechanism 3 to the inside of the high-pressure membrane inlet pipe 6 to sterilize the seawater entering the RO membrane 9, thereby extending the cleaning cycle and service life of the RO membrane 9.

[0037] The dosing mechanism 3 includes a dosing tank 301 fixedly installed on the top of the base 1 and a connecting pipe 306 connected to the bottom of the dosing tank 301. The right side of the connecting pipe 306 is connected to the input end of the diaphragm pump 11. A Y-type filter 12 is fixedly installed inside the connecting pipe 306. The dosing tank 301 is used to hold the bactericide, and the Y-type filter 12 is used to pre-filter the bactericide entering the high-pressure membrane inlet pipe 6.

[0038] The top of the dosing tank 301 is fixedly mounted with an installation plate 302, and the top of the installation plate 302 is fixedly mounted with a motor 303. The output shaft of the motor 303 passes through the interior of the dosing tank 301 and is fixedly mounted with a transmission rod 304. Stirring rods 305 are fixedly mounted on both sides of the transmission rod 304 and inside the dosing tank 301. The motor 303, transmission rod 304 and stirring rod 305 are used to stir the bactericide inside the dosing tank 301.

[0039] The RO membrane 9 has a pre-water header 10 fixedly installed on its front side and an inlet header 14 fixedly installed on its rear side. The rear side of the inlet header 14 is connected to the bottom of the high-pressure membrane inlet pipe 6. The pre-water header 10 is used to discharge the desalinated water in a concentrated manner, and the inlet header 14 is used to divert the seawater inside the high-pressure membrane inlet pipe 6 to the interior of the RO membrane 9.

[0040] The outlet of the diaphragm pump 11 is connected to a dosing pipe 7, the end of which is connected to the upstream pipeline of the core filter 5. The dosing pipe 7 is used to introduce pressurized bactericide into the interior of the high-pressure membrane inlet pipe 6 to sterilize the seawater.

[0041] The input end of the high-pressure pump 2 is connected to the outlet pipe 4 of the core filter, and the input end of the outlet pipe 4 of the core filter is connected to the core filter 5. The outlet pipe 4 and the core filter 5 are used to introduce the seawater to be desalinated into the interior of the high-pressure pump 2 for pressurization to facilitate subsequent desalination of the seawater.

[0042] The online flow cytometer system 15 has two fourth conduits 13 connected to its rear side. The rear side of the fourth conduits 13 is connected to the high-pressure membrane inlet pipe 6. The fourth conduits 13 are used to send seawater from inside the high-pressure membrane inlet pipe 6 to the interior of the online flow cytometer system 15. The online flow cytometer system 15 is used to detect microorganisms in the seawater. The online flow cytometer system 15 is a special device that integrates and automates flow cytometry technology for real-time, continuous, and unattended monitoring of environmental samples such as water bodies. It breaks through the limitations of traditional flow cytometers that require manual sample loading, staining, and laboratory operation. It can be directly deployed at water plants, monitoring buoys, research vessels, or pipelines to achieve "in-situ" analysis. Because it is an existing device, it is not described in detail in the accompanying drawings of the instruction manual.

[0043] Specifically, in this embodiment, a transparent acrylic liquid level observation window is embedded and fixed in the side wall of the dosing tank 301, and the surface of the liquid level observation window is engraved with capacity scale lines. Through the transparent liquid level observation window, the remaining amount of bactericide inside the dosing tank 301 can be viewed intuitively and in real time. At the same time, a magnetic float liquid level gauge with remote transmission is set up, eliminating the need to open the lid for inspection, simplifying the remaining amount inspection operation before dosing, improving the convenience of operation; it also facilitates the preparation of dosing consumables in advance and reduces the waiting time for device shutdown for replenishment.

[0044] Specifically, in this embodiment, the online flow cytometer system 15 adapted for monitoring microorganisms in seawater desalination can be either the Juguang Technology FCM-8000 online flow cytometer, which is designed for in-situ monitoring of microorganisms in aquatic environments, is adapted to high-salinity seawater media, and can directly detect seawater samples without complicated laboratory pretreatment; or the Haiguang Instruments HG-FCM900 online flow cytometer, which supports quantitative analysis of microorganisms in complex water bodies such as seawater and sewage, has real-time data transmission and threshold alarm functions, and can be directly linked with external pumps for control.

[0045] The online flow cytometer system utilizes fluid dynamics to single-cell microorganisms in seawater samples, combines optical detection technology to capture characteristic signals of the microorganisms, and achieves quantitative detection of microbial content through signal analysis. It can also output electrical signals based on preset thresholds to enable peripheral device linkage, adapting to the workflow of this device. Its specific working process, tailored to the application scenario of this seawater desalination device, is divided into six key steps:

[0046] 1. In-situ sample collection

[0047] The system extracts a small amount of pressurized seawater sample in real time from the high-pressure membrane inlet pipe through the fourth conduit of the device. The collected seawater sample is pre-treated by the built-in microfiltration component (filtering out tiny particulate impurities in the seawater to avoid clogging the instrument flow channel) to ensure that only microbial cells are retained in the sample to enter the detection unit, which is suitable for the medium characteristics of high salinity seawater.

[0048] 2. Formation of single-cell fluid flow

[0049] The pretreated seawater sample enters the instrument's hydrodynamic unit. Under the enveloping effect of the sheath fluid, a stable coaxial flow field of "sheath fluid-sample flow" is formed. The laminar flow of the sheath fluid compresses the sample flow into an extremely fine liquid column, allowing the microbial cells in the seawater to pass through the detection optical path sequentially and at a uniform speed in the form of single cells. This avoids detection errors caused by cell overlap and ensures quantitative accuracy.

[0050] 3. Excitation by optical signal

[0051] When a single microbial cell passes through the detection optical path, the instrument's laser emission module emits a laser of a specific wavelength (such as a 488nm blue laser) to irradiate the cell. After the laser interacts with the cell, two types of characteristic light signals are generated: one is scattered light (including forward scattered light and side scattered light; forward scattered light is related to the size of the cell, while side scattered light is related to the internal structure and morphology of the cell); the other is a fluorescence signal (which can utilize the microorganism's own autofluorescence, such as the autofluorescence of bacterial nucleic acids and proteins, or can be enhanced by adding a trace amount of fluorescent dye through the instrument's built-in online staining module, thereby increasing the fluorescence signal of the microorganism and improving the detection sensitivity).

[0052] 4. Feature signal capture and conversion

[0053] The instrument's photoelectric detection module (photomultiplier tube, photodiode) captures scattered light and fluorescence signals in real time, converting the light signals into identifiable electrical pulse signals. The intensity of the electrical pulse signals is related to the characteristics of the microorganisms (e.g., the greater the pulse intensity, the larger the bacterial volume or the stronger the fluorescence), and the number of electrical pulse signals is positively correlated with the number of microorganisms per unit volume of seawater.

[0054] 5. Quantitative analysis of microbial content

[0055] The instrument's data analysis module processes, calibrates, and analyzes electrical pulse signals in real time. Combined with the injection flow rate of seawater samples, it calculates the total concentration of microorganisms per unit volume of seawater (e.g., cells / mL). Simultaneously, based on the differences in the characteristics of scattered light and fluorescence, it can perform preliminary classification and identification of the main polluting bacterial groups (e.g., bacteria, fungi, algae) in seawater, which meets the background technology's requirement of "identifying the main polluting bacterial groups to provide a basis for bactericide screening."

[0056] 6. Monitoring signal feedback and peripheral device linkage

[0057] The data analysis module compares real-time microbial concentration data with the preset microbial contamination threshold in the instrument (which can be set according to the contamination control requirements of the seawater desalination RO membrane). If the detected microbial concentration is below the threshold, the system will not output any linkage signal and the diaphragm pump will remain closed. If the detected microbial concentration exceeds the threshold, the system will immediately output an electrical control signal to the diaphragm pump of this device to trigger the pump to start, thereby realizing the on-demand addition of bactericide. During the addition process, the system continuously monitors the process. When the microbial concentration falls back below the threshold, the system stops outputting the control signal, the diaphragm pump shuts down, and one linkage sterilization process is completed. At the same time, based on real-time data, the flow rate is adjusted in real time to accurately control the dosage and avoid cost waste caused by overdosing.

[0058] Working principle:

[0059] I. Equipment Preparation Stage

[0060] First, check the connection status and operational reliability of each component of the device: ensure that the high-pressure pump 2, dosing mechanism 3, RO membrane holder 8, diaphragm pump 11, and online flow cytometer system 15 on the base 1 are firmly installed without looseness; check that the connections between each conduit and the corresponding component are well sealed without leakage; inject sufficient bactericide into the dosing tank 301 of the dosing mechanism 3 to ensure that the bactericide level meets the operational requirements; check that the Y-type filter 12 and cartridge filter 5 are not clogged, and that the membrane elements of the RO membrane 9 are intact; start the online flow cytometer system 15, diaphragm pump 11, high-pressure pump 2, and motor 303 for no-load testing; calibrate the monitoring accuracy of the online flow cytometer system 15; ensure that each component operates smoothly and the linkage logic is normal; and complete the equipment preparation work.

[0061] II. Seawater Pretreatment and Pressurized Transportation Stage

[0062] The high-pressure pump 2 is started, and the seawater to be desalinated enters the core filter 5 through the upstream pipe of the core filter. The core filter 5 pre-treats the seawater, filtering out large particles, suspended solids and other foreign objects in the seawater to prevent impurities from entering the high-pressure pump 2 and causing wear, or entering the subsequent RO membrane 9 and causing membrane element blockage or scratches. The pre-treated clean seawater enters the high-pressure pump 2 through the core filter outlet pipe 4. After the high-pressure pump 2 pressurizes the seawater, it sends it to the high-pressure membrane inlet pipe 6 through its output end. The high-pressure membrane inlet pipe 6 extends along the rear side of the top of the base 1, providing sufficient pressure support for subsequent microbial monitoring, sterilization and RO membrane desalination, ensuring that the seawater can successfully complete the subsequent process.

[0063] III. Microbial Monitoring and Coordinated Sterilization Phase

[0064] This stage achieves real-time monitoring and precise sterilization of seawater microorganisms. Through the synergistic action of the online flow cytometer system 15, diaphragm pump 11, and dosing mechanism 3, microbial contamination is controlled at the source, protecting the RO membrane 9. The specific process is as follows:

[0065] 1. Real-time microbial monitoring: After the online flow cytometer system 15 is started, pressurized seawater in the high-pressure membrane inlet pipe 6 is extracted in real time through the two fourth conduits 13 connected to its rear side. The microbial content in the seawater is continuously and unattended, and the monitoring data is fed back in real time to determine whether the microbial content in the seawater exceeds the preset threshold.

[0066] 2. Stirring and delivery of bactericide: During the monitoring process, the motor 303 on the top of the dosing tank 301 of the dosing mechanism 3 is started. The output shaft of the motor 303 drives the transmission rod 304 to rotate inside the dosing tank 301. The stirring rods 305 on both sides of the transmission rod 304 rotate synchronously to stir the bactericide in the dosing tank 301 evenly, ensuring that the concentration of the bactericide is consistent and avoiding local concentrations that are too high or too low, which would affect the bactericidal effect. The bactericide after being stirred evenly flows to the input end of the diaphragm pump 11 through the connecting pipe 306 at the bottom of the dosing tank 301. The Y-type filter 12 inside the connecting pipe 306 filters the bactericide to remove impurities, sediments and other foreign objects in the bactericide, preventing foreign objects from clogging the dosing pipe 7, the high-pressure membrane inlet pipe 6 or scratching the membrane element of the RO membrane 9.

[0067] 3. Precise and Linked Sterilization: When the online flow cytometer system 15 detects that the microbial content in the seawater exceeds the preset threshold, it immediately sends a feedback control signal to the diaphragm pump 11 to start the diaphragm pump 11. The diaphragm pump 11 pressurizes the sterilizing agent filtered by the Y-type filter 12 and sends it to the top of the high-pressure membrane inlet pipe 6 through the dosing pipe 7 connected to its top, where it is fully mixed with the pressurized seawater in the high-pressure membrane inlet pipe 6 to precisely kill the microorganisms in the seawater. If the detected microbial content is lower than the preset threshold, the online flow cytometer system 15 controls the diaphragm pump 11 to stop running and stop dosing, realizing "dosing on demand and precise sterilization", which not only ensures the sterilization effect but also saves the amount of sterilizing agent used and reduces operating costs.

[0068] IV. RO Membrane Desalination Stage

[0069] After precise sterilization, the clean seawater continues to flow within the high-pressure membrane inlet pipe 6, eventually being delivered to the inlet header pipe 14, which is connected to the bottom of the high-pressure membrane inlet pipe 6. The inlet header pipe 14 is fixedly installed on the rear side of the RO membrane 9. Its core function is to evenly distribute the seawater in the high-pressure membrane inlet pipe 6 to each RO membrane 9 evenly distributed inside the RO membrane frame 8, ensuring that the inlet flow rate and pressure of each RO membrane 9 are consistent, thereby improving desalination efficiency and water quality uniformity. After the seawater enters the RO membrane 9, under high pressure, the seawater is separated from salt and residual impurities through the osmosis of the RO membrane, completing the seawater desalination operation. The desalinated freshwater permeates to the front side of the RO membrane 9 and is collected through the product water header pipe 10, which is fixedly installed on the front side of the RO membrane 9. Finally, it is discharged from the outside of the device through the product water header pipe 10 for subsequent use, achieving the core purpose of seawater desalination.

[0070] V. Discharge and Equipment Reset Stage

[0071] After the pre-set seawater desalination operation is completed, the high-pressure pump 2, the online flow cytometer system 15, and the motor 303 are turned off in sequence to stop seawater delivery, microbial monitoring, and bactericide stirring. After no more fresh water is discharged from the water production header 10, the relevant discharge valves are closed to complete the desalinated water collection operation.

[0072] After the operation is completed, perform a simple cleaning and reset of the equipment: clean the impurities trapped in the core filter 5 and Y-type filter 12 to avoid clogging and affecting the next use; check the sealing status and integrity of each conduit and RO membrane 9, and repair any leaks or damage in time; replenish the dosing tank 301 of the dosing mechanism 3 with sufficient disinfectant to prepare for the next operation; finally, turn off the power to all equipment, restore the equipment to the initial state, and wait for the next batch of seawater desalination operations.

[0073] Example 2

[0074] The following reference Figure 6 Another embodiment of the integrated seawater desalination microbial contamination control device of the present invention is described. The integrated seawater desalination microbial contamination control device of this embodiment includes an online flow cytometer system, a hydraulic / mechanical diaphragm pump, and a dosing mechanism (including a dosing tank and a Y-type filter). The dosing mechanism is in fluid communication with the hydraulic / mechanical diaphragm pump, which is connected to the upstream pipeline of the core filter. The online flow cytometer system is connected to the pipeline between the high-pressure pump and the RO membrane device and is used to control the operation of the hydraulic / mechanical diaphragm pump.

[0075] The online flow cytometer system of this invention's integrated seawater desalination microbial contamination control device determines the cumulative amount of microbial contaminants in the water by measuring the total bacterial count and the quantity of specific bacteria. Simultaneously, it measures the quantity of certain specific bacteria, allowing for the identification of the main bacterial populations polluting the RO membrane in different sea areas based on long-term concentration changes during operation. The dosing mechanism of this integrated seawater desalination microbial contamination control device includes a dosing tank and a Y-type filter. Based on the bacterial populations polluting the RO membrane in different sea areas detected by the online flow cytometer system, a specific and effective non-oxidizing bactericide is selected and replenished periodically in the dosing tank. The reagent in the dosing tank passes through an inlet valve and the Y-type filter before entering the dosing pump. The dosing pump is a mechanical / hydraulic diaphragm pump equipped with a frequency converter that automatically sets the frequency based on changes in the measured quantity of specific bacterial populations, effectively regulating the dosing dosage and controlling both the effectiveness and cost of dosing.

[0076] Example

[0077] A seawater desalination plant in Hebei Province, China, produces 50,000 cubic meters of fresh water per day. 3 / d, RO membrane recovery rate 45%, RO membrane feed water volume 111,111m 3 / d, hourly inflow 4630m³ 3 / h, the online flow cytometer system can be installed on the pipeline between the high-pressure pump and the RO membrane device in the on-site RO system to determine the amount of polluting microorganisms in the influent as 9-15×10⁴ cells / mL, with a 2m³ dosing tank. 3 The metering pump has a flow rate of 80 L / h. When the amount of contaminating microorganisms in the influent is 9 × 10⁴ cells / ml, the online flow cytometer sends a feedback signal to the PLC. The PLC then outputs a dosage of 10 ppm based on a pre-set formula. At this time, the flow rate of the mechanical / hydraulic diaphragm pump is 47 L / h. When the amount of contaminating microorganisms in the influent is 15 × 10⁴ cells / ml, the online flow cytometer sends a feedback signal to the PLC. The PLC then outputs a dosage of 15 ppm based on a pre-set formula. At this time, the flow rate of the mechanical / hydraulic diaphragm pump is 70 L / h. This feedback adjustment keeps the amount of contaminating microorganisms in the influent at a suitable level, ensuring the stable operation of the RO membrane process in the seawater desalination process, significantly extending the cleaning cycle, and greatly reducing the waste of chemical dosing.

[0078] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated device for controlling microbial contamination in seawater desalination, characterized in that, Includes a base (1), a high-pressure pump (2) is provided on the left side of the base (1), an online flow cytometer system (15) is provided on the top of the base (1), an RO membrane frame (8) is provided on the right side of the base (1), and RO membranes (9) are uniformly distributed and fixedly installed inside the RO membrane frame (8). A high-pressure membrane inlet pipe (6) is provided on the rear side of the base (1) and the RO membrane frame (8). A diaphragm pump (11) is fixedly installed on the top of the base (1) and in front of the online flow cytometer system (15). A drug dosing mechanism (3) is provided on the top of the base (1) and in front of the high-pressure pump (2). The high-pressure membrane inlet pipe (6) is connected to the output end of the high-pressure pump (2). The dosing mechanism (3) includes a dosing tank (301) fixedly installed on the top of the base (1) and a connecting pipe (306) connected to the bottom of the dosing tank (301). The right side of the connecting pipe (306) is connected to the input end of the diaphragm pump (11). A Y-type filter (12) is fixedly installed inside the connecting pipe (306).

2. The integrated device for controlling microbial contamination in seawater desalination according to claim 1, characterized in that, A mounting plate (302) is fixedly installed on the top of the dosing tank (301), and a motor (303) is fixedly installed on the top of the mounting plate (302). The output shaft of the motor (303) passes through the interior of the dosing tank (301) and a transmission rod (304) is fixedly installed thereon. Stirring rods (305) are fixedly installed on both sides of the transmission rod (304) and inside the dosing tank (301).

3. The integrated device for controlling microbial contamination in seawater desalination according to claim 1, characterized in that, The RO membrane (9) is fixedly installed with a product water header pipe (10) on the front side and a water inlet header pipe (14) is fixedly installed on the rear side of the RO membrane (9). The rear side of the water inlet header pipe (14) is connected to the high-pressure membrane water inlet pipe (6), and the RO concentrate pipe is connected to the external discharge pipe.

4. The integrated device for controlling microbial contamination in seawater desalination according to claim 1, characterized in that, The outlet of the diaphragm pump (11) is connected to a dosing pipe (7), and the end of the dosing pipe (7) is connected to the upstream of the cartridge filter (5).

5. The integrated device for controlling microbial contamination in seawater desalination according to claim 1, characterized in that, The high-pressure pump (2) is connected to the core filter (5) through the core filter outlet pipe (4).

6. The integrated device for controlling microbial contamination in seawater desalination according to any one of claims 1-5, characterized in that, The rear side of the online flow cytometer system (15) is connected to the high-pressure membrane inlet pipe (6) via two fourth conduits (13).

7. The integrated device for controlling microbial contamination in seawater desalination according to claim 2, characterized in that, The side wall of the dosing tank (301) is fitted with a transparent acrylic liquid level observation window. The surface of the liquid level observation window is engraved with capacity scale lines. At the same time, a magnetic float liquid level gauge with remote transmission is provided, which can remotely control the replenishment of medicine and control the liquid level.

8. An integrated device for controlling microbial contamination in seawater desalination, characterized in that, The integrated device for controlling microbial contamination in seawater desalination includes an online flow cytometer system, a diaphragm pump, and a dosing mechanism. The dosing mechanism is in fluid communication with the diaphragm pump, which is connected to the upstream pipeline of the cartridge filter. The online flow cytometer system is connected to the pipeline between the high-pressure pump and the RO membrane device and is used to control the operation of the diaphragm pump.

9. The integrated device for controlling microbial contamination in seawater desalination according to claim 8, characterized in that, The diaphragm pump is a mechanical diaphragm pump or a hydraulic diaphragm pump.

10. The integrated device for controlling microbial contamination in seawater desalination according to claim 8, characterized in that, The dosing mechanism includes a dosing tank and a Y-type filter, and the dosing tank is in fluid communication with the diaphragm pump through the Y-type filter.

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