Drinking water nanofiltration complete equipment

Abstract

The utility model discloses a kind of drinking water nanofiltration complete equipment and process method, belong to drinking water processing technical field.The equipment mainly includes modular design's nanofiltration lifting system, nanofiltration system, nanofiltration dosing system and nanofiltration cleaning system.It is in at its core, the nanofiltration system adopts one level three-stage filter device, and is equipped with interstage booster device, simultaneously optimizes membrane element packing density, cooperation frequency conversion control and on-line water quality monitoring.The utility model solves the problem that existing equipment scale is small, poor adaptability by modularization extensible design;Through the optimization of system internal structure and operating parameter, the effect that membrane flux distribution is uniform, pressure drop is small, energy consumption is low is realized, effectively prolongs membrane life, significantly reduces operating cost.The utility model is especially suitable for the preparation of large-scale, high-quality drinking water.

Description

Technical Field

[0001] This utility model relates to the field of drinking water treatment technology, and more specifically, to a complete set of nanofiltration equipment for drinking water. Background Technology

[0002] With socio-economic development and improved living standards, the demand for high-quality drinking water is increasing. However, my country has a vast territory, and the composition of tap water varies significantly between regions. For example, there are large differences in indicators such as hardness and total dissolved solids (TDS) between the north and south, and some industrial provinces have high water hardness. At the same time, due to industrial pollution, raw water may contain impurities, heavy metals, and excessive disinfectant residues.

[0003] The existing technology has the following drawbacks: 1. Low modularity and insufficient scalability. Most existing nanofiltration equipment adopts a fixed structure with rigid connections between modules. For example, the filter cartridge and membrane housing of traditional nanofiltration modules are often sealed by adhesive bonding or welding. While this ensures short-term sealing, it makes disassembly difficult and easily damages core components when replacing the filter element. This design is difficult to flexibly adapt to the needs of different treatment scales, especially since it cannot achieve capacity adjustment by simply adding or removing modules, limiting the large-scale development of single-unit equipment. 2. Increased energy consumption due to membrane fouling is a core issue during nanofiltration system operation. As the mainstream technology, spiral wound membrane modules are prone to contaminant accumulation due to internal feed spacers, increasing hydraulic resistance and reducing flux by more than 30% (e.g., the permeability of NF90 flat sheet membrane decreased from 5.5 L·m³ in SA fouling experiments). -2 ·h -1 ·bar -1 Reduced to 3.6 L·m -2 ·h -1 ·bar -1 Furthermore, the high-pressure pumps in reverse osmosis systems account for 40%-50% of operating costs, while nanofiltration systems, although requiring lower pressure, still suffer from significant energy losses due to a lack of inter-stage energy optimization design. 3. Inadequate membrane fouling control mechanisms. Organic fouling: Hollow fiber membranes and flat sheet membranes exhibit significantly different fouling behaviors, but existing equipment often lacks optimized flow channel design for membrane configurations, resulting in insufficient anti-fouling capabilities. Inorganic scaling: The common SiO2 and CaSO4 scaling problems in water plant practice (accounting for 27.1%) are disconnected from the focus of laboratory research (CaSO4 accounting for 42.9%), lacking control strategies for scaling in actual water quality. Material limitations: Although new membrane materials (such as polyamide composite membranes and hydrolyzed polyacrylonitrile-based membranes) can improve flux and rejection rate, large-scale applications still face problems such as poor chemical stability and insufficient chlorine resistance.

[0004] Therefore, there is an urgent need in this field for a domestically produced large-scale nanofiltration complete set of equipment and process methods that can overcome the above-mentioned defects and achieve large-scale, high-efficiency, low-energy consumption and easy expansion. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the above-mentioned shortcomings of the prior art and provide a domestically produced large-scale nanofiltration complete set of equipment and process method for high-quality drinking water that is scalable, has balanced water distribution, low head loss, and low operating energy consumption.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A complete nanofiltration system for drinking water includes: The nanofiltration boosting system includes a nanofiltration boosting pump, a frequency converter, a check valve, and a manual shut-off valve. The nanofiltration boosting system is a modular and scalable design, and different numbers of modules can be selected according to the water volume. A nanofiltration system, comprising a nanofiltration security filter, a nanofiltration high-pressure pump, and a nanofiltration device, wherein the nanofiltration device is arranged in a multi-segment configuration and is equipped with an inter-segment pressurization device; A nanofiltration dosing system, comprising a metering tank, a metering pump, and a shut-off valve; A nanofiltration cleaning system, comprising a cleaning solution tank, a cleaning water pump, and a cleaning security filter; The nanofiltration enhancement system, nanofiltration system, nanofiltration dosing system, and nanofiltration cleaning system are connected and expanded through modular interfaces.

[0007] Furthermore, the modular interface is a flange interface. This feature directly addresses the problem of "poor compatibility between different modules." The use of a standardized flange interface achieves high compatibility and sealing reliability in physical connections, enabling the rapid and convenient assembly and expansion of different numbers of modules. This reduces the complexity and cost of on-site installation, truly realizing the modular and large-scale design goals of the equipment.

[0008] Furthermore, the frequency converter control device of the nanofiltration booster pump and / or nanofiltration high-pressure pump is connected to a pressure gauge for real-time monitoring of the downstream pressure and to achieve constant-pressure water supply. This feature primarily addresses the issue of "high operating costs." By forming a closed-loop system through frequency converter control and pressure feedback, the pump speed and output pressure can be precisely adjusted according to actual needs, avoiding the energy waste caused by the long-term full-speed operation of traditional fixed-frequency pumps and significantly reducing system energy consumption. Simultaneously, constant-pressure water supply ensures stable inlet pressure for the nanofiltration membrane, which helps extend membrane life and further reduces operating and maintenance costs.

[0009] Furthermore, the nanofiltration device is arranged in a single-stage, three-stage configuration. This feature is key to solving the problems of high operating costs and small single-unit scale. Compared to traditional single-stage or two-stage arrangements, the optimized "single-stage, three-stage" layout allows for a more uniform distribution of water flow and membrane flux within the system, effectively reducing local concentration polarization and scaling risks. This ensures a high desalination rate while reducing overall system pressure drop and energy consumption, and allows a single system to process larger volumes of water.

[0010] Furthermore, in the nanofiltration device, the membrane element packing density of a single pressure vessel is multi-core. This feature aims to solve the problem of "small scale of a single unit". By increasing the number of membrane elements packed in a single pressure vessel (multi-core), the membrane area is significantly increased within the same equipment footprint, thereby improving the processing capacity of a single unit and laying the foundation for realizing large-scale, intensive complete sets of equipment.

[0011] Furthermore, the membrane element packing density of the single pressure vessel is 7 cores. Research and experimental verification have shown that "7 cores" represents a specific solution that achieves the optimal balance between packing density and operational efficiency while ensuring smooth water flow, avoiding excessive pressure drop, and minimizing cleaning difficulties. This specific density most effectively balances system processing capacity, energy consumption, and membrane lifespan, making it one of the best implementation methods for reducing operating costs.

[0012] Furthermore, the inter-stage pressurization device provides an inter-stage pressurization value that is a set low pressure value. This feature addresses the problem of "high operating costs." In a multi-stage nanofiltration system, the pressure drops after the water flows through the upstream membrane elements, resulting in insufficient driving force for the downstream membrane elements. By compensating with a "set low pressure value" through inter-stage pressurization, the driving force for the downstream stages can be restored, ensuring balanced membrane flux across all stages, avoiding low efficiency in the downstream membranes, and thus reducing the overall total inlet water pressure required by the system, achieving energy savings and stable operation.

[0013] Furthermore, the set low pressure value is 0.2 bar. Specifically, setting the boost pressure value to "0.2 bar" is an ideal value determined through extensive experiments. This value can effectively compensate for inter-stage pressure loss, ensure the overall system flux balance and desalination performance, and avoid unnecessary energy loss caused by excessive boost pressure. It achieves the optimal balance between energy consumption and performance, and has a direct and quantifiable positive effect on reducing operating costs.

[0014] Furthermore, the nanofiltration security filter is equipped with differential pressure sensors at its inlet and outlet for intelligent reminders to replace the filter cartridge. This feature indirectly contributes to "reducing operating costs" and "extending system lifespan." Clogged security filter cartridges lead to increased inlet water pressure loss, increasing the energy consumption of the upstream pump, and may even contaminate the expensive downstream nanofiltration membrane due to cartridge damage. The differential pressure sensor can accurately monitor the cartridge clogging status, enabling on-demand replacement rather than periodic replacement. This avoids the waste of premature replacement and prevents damage to the system caused by delayed replacement, representing an intelligent energy-saving and consumption-reducing measure.

[0015] Furthermore, the nanofiltration device is equipped with an online water quality analyzer on its product water pipeline for real-time monitoring of the product water quality. This feature indirectly reduces operating costs by ensuring product water quality and stable system operation. Real-time water quality monitoring ensures that the effluent consistently meets high-quality drinking water standards. Simultaneously, changes in water quality data can promptly reflect the performance status of the nanofiltration membrane (such as a decrease in desalination rate), providing a basis for determining whether the membrane needs cleaning or maintenance, enabling predictive maintenance, avoiding irreversible membrane damage, thereby extending membrane lifespan and reducing replacement costs.

[0016] A domestically produced large-scale nanofiltration system for high-quality drinking water is characterized by its modular and scalable system design, optimized internal structure arrangement and operational control strategy of the core nanofiltration unit. The system mainly comprises a nanofiltration booster system, a nanofiltration system, a nanofiltration dosing system, and a nanofiltration cleaning system. Each system adopts a modular design, enabling flexible connection and expansion through standardized interfaces (such as flange interfaces). This allows for the selection of different numbers of modules based on the actual water treatment volume, effectively overcoming the limitations of single-unit equipment size and resolving the issue of poor compatibility between modules.

[0017] Furthermore, the nanofiltration device employs an optimized and validated multi-segment arrangement, preferably a single-stage three-segment arrangement. With this arrangement, by incorporating inter-segment pressurization devices and optimizing the membrane element packing density, the membrane flux distribution within the system becomes more uniform, desalination performance is stable, and system pressure drop is significantly reduced, thus lowering energy consumption. Preferably, the membrane element packing density of a single pressure vessel is 7 cores, and the inter-segment pressurization value is 0.2 bar. This combination of parameters results in optimal overall system performance and a longer service life.

[0018] In addition, the equipment integrates intelligent control units. For example, the nanofiltration booster pump and high-pressure pump are equipped with frequency converters and linked with pressure gauges to achieve constant pressure water supply and intelligent start-stop, thus saving energy; the nanofiltration security filter is equipped with a differential pressure sensor to provide intelligent reminders for filter replacement; and the product water pipeline is equipped with online water quality analysis instruments to monitor the product water quality in real time.

[0019] Compared with the prior art, the beneficial effects of this utility model include: Modular and scalable: Through modular design and standardized interfaces, the equipment can be flexibly expanded according to needs, solving the problems of small scale of single equipment and poor module adaptability, and is suitable for water plant construction and upgrading of different scales.

[0020] High efficiency and low energy consumption: By optimizing the internal arrangement (one stage and three sections) and operating parameters of the nanofiltration unit (such as 7-core filling and 0.2 bar inter-section pressurization), the system achieves flux balance and low pressure drop operation, which significantly reduces operating energy consumption.

[0021] Long lifespan and low cost: Optimized physical design, combined with low-pressure flushing, precise dosing, and intelligent cleaning systems, effectively reduces membrane fouling and extends the lifespan of nanofiltration membranes, thereby reducing replacement frequency and overall operation and maintenance costs.

[0022] Intelligent operation: The system integrates online monitoring and frequency conversion control of multiple parameters such as pressure, differential pressure, and water quality, realizing automated and intelligent operation of the system, ensuring stable effluent water quality, and reducing manual intervention. Attached Figure Description

[0023] Figure 1 The PID diagram of the nanofiltration enhancement system provided in this application; Figure 2 The PID diagram of the nanofiltration main processing system provided in this application; Figure 3 The PID diagram of the nanofiltration dosing system provided in this application; Figure 4 The PID diagram of the nanofiltration cleaning system provided in this application; Figure 5 The main system framework diagram provided for this application. Detailed Implementation

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having” and any variations thereof in the specification, claims and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] Example 1: Specific Composition of a Large-Scale Nanofiltration Complete Equipment Reference Figure 1 The high-quality drinking water large-scale nanofiltration complete set of equipment in this embodiment includes, in sequence, a nanofiltration lifting system, a nanofiltration system, a nanofiltration dosing system and a nanofiltration cleaning system connected by pipelines.

[0027] Nanofiltration booster system: mainly includes a nanofiltration booster pump (P5201), a frequency converter control cabinet, a check valve, and a manual butterfly valve. The booster pump uses frequency converter control, and a pressure transmitter is installed on the downstream pipeline to feed the pressure signal back to the frequency converter, forming a closed-loop control to achieve constant pressure water supply. All inlet and outlet ports of this system use standard flange interfaces.

[0028] Nanofiltration system: This is the core treatment unit. The influent first passes through a nanofiltration pre-filter (to remove fine particulate matter), with differential pressure sensors installed at its inlet and outlet. Then, it is pressurized by the nanofiltration high-pressure pump (P5202) before entering the nanofiltration unit. This unit uses a single-stage, three-section arrangement (see...). Figure 2 A total of 21 membrane elements are used, evenly distributed across three pressure vessels, with seven membrane elements per vessel. Inter-stage booster pumps (P5203, P5204) are installed between the first and second stages, and between the second and third stages, to compensate for pressure losses in the upstream stages; the booster pressure is set at 0.2 bar. Online conductivity meters and pH meters (AE / AIT / AIR5201) are installed on the product water pipeline.

[0029] The nanofiltration dosing system includes a reducing agent metering tank (JV5003), a scale inhibitor metering tank (JV5004), corresponding metering pumps (JP5002, JP5003), and a self-cleaning filter. The dosing point is located in the inlet water line of the nanofiltration security filter and after the nanofiltration booster pump, and the dosing amount is precisely controlled by online instrument monitoring data.

[0030] Nanofiltration cleaning system: includes cleaning solution tank (V5801), cleaning water pump (P5801), cleaning security filter and related valves. The solution tank is equipped with a dosing port for preparing acid and alkali cleaning solutions (connected to metering tank JV5005 / JV5006 and metering pump JP5005 / JP5006).

[0031] Example 2: Typical operating process of the equipment This embodiment details the operating process of the above-mentioned equipment, referring to... Figure 3 and Figure 4 .

[0032] Low-pressure flushing mode: Performed before each system startup. Open the low-pressure flushing valve (FV5201), the non-conforming product water discharge valve (FV5203), and the concentrate discharge valve (FV204). Start the nanofiltration flushing pump to perform a short low-pressure flush of approximately 1 minute on the nanofiltration membrane module to remove contaminants that may have accumulated during shutdown. After flushing, close FV5201 and enter water production mode.

[0033] Water production mode: Open the inlet valve (FV5204), the non-conforming water discharge valve (FV5203), and the concentrated water discharge valve (FV204).

[0034] Start the nanofiltration booster pump (P5201).

[0035] Approximately 20 seconds later, the NF concentrate drain valve (FV5202) was closed, and the system began to build up pressure.

[0036] After about 30 seconds, the nanofiltration high-pressure pump (P5202) is started and the unqualified water discharge valve (FV5203) is closed, and the system begins to produce water normally.

[0037] Approximately 60 seconds later, the inter-stage booster pumps (P5203, P5204) are started sequentially, and the system enters a stable full-flow operation state.

[0038] During this period, the dosing system automatically adds reducing agents and scale inhibitors based on online instrument data.

[0039] Cleaning mode (triggered when transmembrane pressure difference increases significantly or permeate flow decreases): Open the manual valve of the cleaning circuit and close the valve in normal operation.

[0040] Start the cleaning pump (P5801) and pump the pre-prepared cleaning solution (such as citric acid solution or NaOH+EDTA solution) from the cleaning solution tank (V5801) into the nanofiltration membrane module.

[0041] The cleaning solution enters from one end of the membrane module, passes through the permeate side and the concentrate side respectively, and then flows back to the cleaning solution tank for circulation cleaning.

[0042] After cleaning for a period of time (e.g., 30-60 minutes), drain the waste liquid and rinse the membrane module with pure water until the pH and conductivity of the effluent return to normal.

[0043] After cleaning, the system can be put back into water production mode.

[0044] Through the above equipment configuration and process implementation, this utility model has successfully achieved efficient, stable, and low-consumption operation of large-scale nanofiltration equipment, and the produced water quality meets the standards for high-quality drinking water, resulting in good economic and social benefits.

[0045] Reference Figures 1 to 4 The device in this embodiment specifically includes the following subsystems: 1. Nanofiltration Enhancement System The system includes at least two nanofiltration booster pumps (P5201A, P5201B) connected in parallel and one common standby pump (P5201X). Each booster pump (such as P5201A) is equipped with a manual shut-off valve (KV P5201A) at the front end and a check valve (H), a pressure gauge (PI 5201A), and an electrically controlled valve (FV5201A) at the rear end.

[0046] The core control unit is a variable frequency drive (VFD), which is linked with the downstream pressure gauge (PI 5201A) to collect pressure signals in real time and achieve constant pressure water supply by adjusting the pump speed. A pressure transmitter (PIT 5201) and a pressure switch (PS 5201A) are installed on the pump outlet main pipe for system-level monitoring and protection.

[0047] All interfaces use standardized flanges, facilitating module additions and removals. The A and N series shown in the diagram have identical structures, demonstrating the ability to be replicated and expanded modularly.

[0048] 2. Nanofiltration system Security filtration unit: The booster system's permeable water first enters the nanofiltration security filter (M5201A, M5201N). Differential pressure sensors (PDS 5201A, PDS 5201N) are installed at the filter inlet and outlet for intelligent reminders to replace the filter cartridge.

[0049] High-pressure pump unit: A nanofiltration high-pressure pump (P5202A, P5202N) is connected after the security filter. Each high-pressure pump is also equipped with a frequency converter (VFD) for soft start and precise flow control. A pressure gauge (PI 5202A), a pressure transmitter (PIT 5202A), and a pressure switch (PS 5202A) are installed after the pump.

[0050] Core nanofiltration device: This device adopts the optimal arrangement of this invention, namely, a single-stage, three-section system. Specifically, it is implemented as follows: The water discharged from the high-pressure pump enters the first nanofiltration membrane module.

[0051] The concentrate after the first stage of treatment is pressurized by about 0.2 bar by the interstage booster pump P5203A before entering the second stage nanofiltration membrane module.

[0052] The second-stage concentrate is then pressurized by approximately 0.2 bar by an inter-stage booster pump P5204A before entering the third-stage nanofiltration membrane module.

[0053] Each pressure vessel has a membrane element packing density of 7 cores. The A-series and N-series filter units are installed in parallel and can be independently controlled via valves (FV5204A, FV5204N).

[0054] Online water quality monitoring: Online water quality analysis instruments (AIT 5202A / AIT5202N) are installed on the nanofiltration unit's permeate pipeline to monitor key indicators such as conductivity (COND), pH value, and ORP in real time (AE 5202A / AE 5202N). The concentrate discharge pipeline is equipped with a flow meter (FIT 5202A) and a regulating valve (FV5202A).

[0055] 3. Nanofiltration dosing system The system is modularly designed and includes metering tanks for reducing agent (JV5003), scale inhibitor (JV5004), and cleaning agents (JV5005, JV5006). Each metering tank is equipped with a level sensor (LRS).

[0056] The chemicals are added via corresponding metering pumps (JP5002A / X for JV5003, JP5003A / X for JV5004, etc.). The dosing point is located after the nanofiltration security filter's inlet water line and the NF booster pump. The dosage is precisely adjusted by the control system based on feedback (such as pH, ORP) from the online water quality analyzer (AIT 5201).

[0057] 4. Nanofiltration cleaning system The core of the cleaning system is the cleaning solution tank (V5801), equipped with a level gauge (L5801) and a temperature indicator (TI 5801). The cleaning solution is delivered by the cleaning pump (P5801), passes through the cleaning security filter (M5801), and is then injected into the nanofiltration membrane module for circulation cleaning by opening the cleaning manual valve (KVP5801).

[0058] The cleaning circuit is equipped with a flow meter (FIT 5801) and a pressure gauge (PI 5801), and is also equipped with an online pH meter (AIT5801) to monitor the status of the cleaning solution.

[0059] Typical operating process of the equipment (with attached diagram) Water production mode: Open the inlet valve FV5204A / N → Open the NF non-conforming water discharge valve FV5203A / N and the concentrate discharge valve FV5202A / N → Start the NF booster pump P5201A (controlled by VFD) → After 20 seconds, close the NF concentrate discharge valve FV5202A / N → After 30 seconds, start the NF high-pressure pump P5202A and close the NF non-conforming water discharge valve FV5203A / N → After 60 seconds, start the NF inter-stage booster pumps P5203A and P5204A sequentially. The system enters a stable water production state, and the water quality is monitored in real time by AIT 5202A / N.

[0060] Dosing mode: The dosing system operates synchronously with the water treatment mode. The reducing agent is added from JV5003 via JP5002A, and the scale inhibitor is added from JV5004 via JP5003A. The control system dynamically adjusts the metering pump frequency based on the ORP and pH values ​​monitored by AIT 5201 to achieve precise dosing, adapting to fluctuations in raw water quality and protecting the NF membrane.

[0061] Low-pressure flushing mode: Before each startup, first open the low-pressure flushing valve FV5201A → open the NF unqualified water discharge valve FV5203A and the concentrated water discharge valve FV5202A → start the NF flushing pump (unless otherwise marked in the diagram, it can be achieved by low-frequency operation of P5201A or a dedicated pump) → after flushing for about 1 minute, turn off FV5201A and switch to the above water production mode.

[0062] Chemical cleaning mode: When the differential pressure sensor PDS 5201A indicates an excessively high reading or the permeate flow rate decreases, initiate the cleaning process. Close the normal operating valves and open valves such as KV P5801 in the cleaning circuit. Start the cleaning pump P5801 to circulate the chemical solution (prepared using JP5005A / JV5005 and JP5006A / JV5006) from V5801 through the NF membrane module. After cleaning, discharge the waste liquid and rinse with permeate water until the pH and conductivity displayed on AIT5801 meet the standards.

[0063] It should be understood that the disclosed apparatus can be implemented in other ways, given the several embodiments provided in this application. For example, the apparatus embodiments described above are merely illustrative; the division of units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or communication connections shown or discussed may be through some interfaces; the indirect coupling or communication connections between devices or units may be telecommunications or other forms.

[0064] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Although this utility model has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of this utility model according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of this utility model. These technical solutions are also within the scope of protection of this utility model.

Claims

1. A complete nanofiltration system for drinking water, characterized in that, include: The nanofiltration boosting system includes a nanofiltration boosting pump, a frequency converter, a check valve, and a manual shut-off valve. The nanofiltration boosting system is a modular and scalable design, and different numbers of modules can be selected according to the water volume. A nanofiltration system, comprising a nanofiltration security filter, a nanofiltration high-pressure pump, and a nanofiltration device, wherein the nanofiltration device is arranged in a multi-segment configuration and is equipped with an inter-segment pressurization device; A nanofiltration dosing system, comprising a metering tank, a metering pump, and a shut-off valve; A nanofiltration cleaning system, comprising a cleaning solution tank, a cleaning water pump, and a cleaning security filter; The nanofiltration enhancement system, nanofiltration system, nanofiltration dosing system, and nanofiltration cleaning system are connected and expanded through modular interfaces.

2. The nanofiltration complete set of equipment according to claim 1, characterized in that, The modular interface is a flange interface.

3. The nanofiltration complete set of equipment according to claim 1, characterized in that, The frequency converter control device of the nanofiltration booster pump and / or nanofiltration high-pressure pump is connected to a pressure gauge for real-time monitoring of the pump downstream pressure and to achieve constant pressure water supply.

4. The nanofiltration complete set of equipment according to claim 1, characterized in that, The nanofiltration device is arranged in a single-stage, three-stage configuration.

5. The nanofiltration complete set of equipment according to claim 1 or 4, characterized in that, In the nanofiltration device, the membrane element packing density of a single pressure vessel is multi-core.

6. The nanofiltration complete set of equipment according to claim 5, characterized in that, The membrane element packing density of the single pressure vessel is 7 cores.

7. The nanofiltration complete set of equipment according to claim 1, characterized in that, The inter-segment pressurization device provides an inter-segment pressurization value that is a set low pressure value.

8. The nanofiltration complete set of equipment according to claim 7, characterized in that, The set low pressure value is 0.2 bar.

9. The nanofiltration complete set of equipment according to claim 1, characterized in that, The nanofiltration security filter is equipped with differential pressure sensors at its inlet and outlet for intelligent reminders to replace the filter element.

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