Multi-stage membrane system integrated pilot plant

Abstract

This utility model discloses a multi-stage membrane system integrated pilot plant, including a steel platform on which an ultrafiltration membrane system, a first-stage reverse osmosis system, a second-stage reverse osmosis system, a third-stage reverse osmosis system, a chemical cleaning system, a dosing system, and an electrical control system are mounted. By integrating the ultrafiltration membrane system, the third-stage reverse osmosis system, the chemical cleaning system, the dosing system, and the electrical control system onto the steel platform, the problems of messy piping and poor coordination in traditional decentralized equipment are avoided. This achieves integrated operation of the multi-stage membrane treatment process, ensuring continuous and stable pilot-scale operation and providing accurate data support for process scale-up. The series structure of each membrane module forms a multi-stage filtration process, and the compact integrated layout reduces the overall system footprint. The two-layer steel platform structure, with upper and lower layers divided according to equipment functions and operational requirements, significantly reduces the overall footprint while ensuring space for normal operation and maintenance of each system.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection technology, and in particular to a multi-stage membrane system integrated pilot plant. Background Technology

[0002] As the core equipment bridging laboratory-scale testing and large-scale industrial production, the performance stability and process integrity of the pilot plant directly determine the feasibility, safety, and parameter accuracy of process scale-up. Its core function is to verify the actual operating effect of chemical processing such as membrane separation, optimize key process parameters, and accurately determine the safety scale-up factor for industrial-grade production.

[0003] In the pilot application of multi-stage membrane treatment technology, traditional equipment has significant shortcomings: First, the membrane treatment units (such as ultrafiltration and reverse osmosis systems) are mostly distributed, which not only occupies a large area, but also has poor system coordination due to complex pipeline connections, making it difficult to achieve continuous and stable operation and easily causing fluctuations in pilot data; Second, the space utilization efficiency is low, and its applicability is limited in scenarios with limited site space. At the same time, the treatment paths for concentrate and cleaning wastewater are not standardized, which may not meet environmental protection requirements.

[0004] Therefore, there is an urgent need for a multi-stage membrane system pilot-scale equipment that is integrated, efficient, and space-optimized. Utility Model Content

[0005] The purpose of this invention is to provide an integrated pilot-scale equipment for multi-stage membrane systems to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0007] The multi-stage membrane system integrated pilot plant includes a steel platform on which are installed an ultrafiltration membrane system, a first-stage reverse osmosis system, a second-stage reverse osmosis system, a third-stage reverse osmosis system, a chemical cleaning system, a dosing system, and an electrical control system.

[0008] The primary reverse osmosis system includes a primary RO feed pump connected to an ultrafiltration membrane system. The outlet of the primary RO feed pump is connected to a primary RO security filter. The outlet of the primary RO security filter is connected to a primary RO high-pressure pump. The outlet of the primary RO high-pressure pump is connected to a primary RO membrane module. The product water outlet of the primary RO membrane module is connected to a primary RO product water tank. The outlet of the primary RO product water tank is connected to a primary RO flushing pump. The outlet of the primary RO flushing pump is connected to the clean water flushing inlet of the primary RO feed pump.

[0009] The secondary reverse osmosis system includes a secondary RO feed pump connected in parallel with the primary RO flushing pump and connected to the outlet of the primary RO permeate tank. The outlet of the secondary RO feed pump is connected to a secondary RO security filter. The outlet of the secondary RO security filter is connected to a secondary RO high-pressure pump. The outlet of the secondary RO high-pressure pump is connected to a secondary RO membrane module. The permeate outlet of the secondary RO membrane module is connected to the secondary RO permeate tank.

[0010] The three-stage reverse osmosis system includes a three-stage RO feed pump connected to the outlet of the two-stage RO permeate tank, a three-stage RO security filter connected to the outlet of the three-stage RO feed pump, a three-stage RO high-pressure pump connected to the outlet of the three-stage RO security filter, a three-stage RO membrane module connected to the outlet of the three-stage RO membrane module, and a three-stage RO permeate tank connected to the permeate outlet of the three-stage RO membrane module.

[0011] The primary RO membrane module, the secondary RO membrane module, and the tertiary RO membrane module are all composed of three membrane shells connected in series and each containing two RO membrane cores. The three membrane shells connected in series are connected by pipes.

[0012] As a preferred technical solution, the ultrafiltration membrane system includes an ultrafiltration feed pump connected to the inlet pipe of the pretreatment water tank, an ultrafiltration security filter connected to the outlet of the ultrafiltration feed pump, an ultrafiltration membrane module connected to the outlet of the ultrafiltration security filter, an ultrafiltration product water tank connected to the outlet of the ultrafiltration membrane module, an ultrafiltration product water tank connected to the outlet of the ultrafiltration product water tank, and an ultrafiltration backwash pump connected to the outlet of the ultrafiltration backwash pump, the backwash water inlet of the ultrafiltration membrane module being connected to the outlet of the ultrafiltration product water tank; the ultrafiltration backwash pump and the first-stage RO feed pump are connected in parallel and are both connected to the outlet of the ultrafiltration product water tank.

[0013] As a preferred technical solution, the air inlet of the ultrafiltration membrane module is connected to a compressed air storage tank, and the ultrafiltration concentrate crossflow outlet of the ultrafiltration membrane module is connected to a pretreatment system.

[0014] As a preferred technical solution, the concentrate return port of the first-stage RO membrane module, the concentrate discharge port of the second-stage RO membrane module, and the concentrate discharge port of the third-stage RO membrane module are connected in parallel. The concentrate discharge port of the first-stage RO membrane module is connected to the owner's compliance treatment system for the first-stage RO concentrate. The chemical cleaning return port of the ultrafiltration membrane module, the first-stage RO membrane module, the second-stage RO membrane module, and the third-stage RO permeate tank are connected in parallel.

[0015] As a preferred technical solution, the concentrate return port of the secondary RO membrane module is connected to the inlet of the primary RO permeate tank, and the concentrate return port of the tertiary RO membrane module is connected to the inlet of the secondary RO permeate tank.

[0016] As a preferred technical solution, the chemical cleaning system includes a chemical cleaning tank, the outlet of which is connected to a chemical cleaning pump, the outlet of which is connected to a chemical cleaning security filter, and the outlet of which is connected to the chemical cleaning inlet of an ultrafiltration membrane module, a primary RO membrane module, a secondary RO membrane module, and a tertiary RO membrane module.

[0017] As a preferred technical solution, the chemical cleaning tank is connected in parallel with the chemical cleaning pump, and the inlet of the chemical cleaning tank is connected to the inlet of the chemical cleaning security filter and each cleaning return port to form a cleaning liquid circulation loop.

[0018] As a preferred technical solution, the dosing system includes dosing device A, dosing device B, and dosing device C, wherein:

[0019] The dosing device A includes an acid dosing device, an alkali dosing device A, and a sodium hypochlorite dosing device. The dosing pumps of the acid dosing device and the alkali dosing device A are connected to the backwash water inlet of the ultrafiltration membrane module. The dosing pump of the sodium hypochlorite dosing device is connected to the backwash water inlet of the ultrafiltration membrane module and the inlet of the ultrafiltration security filter.

[0020] The dosing device B includes a scale inhibitor dosing device, a reducing agent dosing device, and a non-oxidizing bactericide dosing device. The dosing pumps of the scale inhibitor dosing device, the reducing agent dosing device, and the non-oxidizing bactericide dosing device are all connected to the inlet of the primary RO security filter.

[0021] The dosing device C includes an alkali dosing device B, whose dosing pump is connected to the inlet of the secondary RO security filter and the tertiary RO security filter.

[0022] As a preferred technical solution, the ultrafiltration membrane system, the first-stage reverse osmosis system, the second-stage reverse osmosis system, the third-stage reverse osmosis system, the chemical cleaning system, and the dosing system are all controlled by an electrical control system. The electrical control system includes a power distribution system and a PLC control system to meet the centralized control of the ultrafiltration membrane system, the first-stage reverse osmosis system, the second-stage reverse osmosis system, the third-stage reverse osmosis system, the chemical cleaning system, and the dosing system.

[0023] As a preferred technical solution, the steel platform has a two-layer platform structure. The ultrafiltration feed pump, ultrafiltration security filter, ultrafiltration product water tank, ultrafiltration backwash pump, first-stage RO feed pump, first-stage RO security filter, first-stage RO product water tank, first-stage RO flushing pump, second-stage RO feed pump, second-stage RO security filter, second-stage RO product water tank, third-stage RO feed pump, third-stage RO security filter, chemical cleaning tank, chemical cleaning pump, chemical cleaning security filter, and electrical control system are respectively installed on the lower platform of the steel platform. The ultrafiltration membrane module, first-stage RO high-pressure pump, first-stage RO membrane module, second-stage RO high-pressure pump, second-stage RO membrane module, third-stage RO high-pressure pump, third-stage RO membrane module, dosing device A, dosing device B, and dosing device C are respectively installed on the upper platform of the steel platform.

[0024] This utility model has at least the following beneficial effects:

[0025] This application integrates the ultrafiltration membrane system, three-stage reverse osmosis system, chemical cleaning system, dosing system, and electrical control system onto a steel platform, avoiding the problems of messy piping and poor coordination in traditional decentralized equipment. This achieves integrated operation of the multi-stage membrane treatment process, ensuring continuous and stable pilot-scale operation and providing accurate data support for process scale-up. The series connection of each membrane module forms a multi-stage filtration process, and the compact integrated layout reduces the overall system footprint. The two-layer steel platform structure, with upper and lower layers divided according to equipment functions and operational requirements, significantly reduces the overall footprint while ensuring sufficient space for normal operation and maintenance of each system. This adapts to application scenarios with limited site space and solves the problem of low space utilization in traditional equipment. Attached Figure Description

[0026] Figure 1 This is a first-view schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a second-view schematic diagram of the structure of this utility model;

[0028] Figure 3 This is a first-view schematic diagram of the structure on the steel platform of this utility model;

[0029] Figure 4 This is a second-view schematic diagram of the structure on the steel platform of this utility model;

[0030] Figure 5 This is a schematic diagram showing the connection relationship between the ultrafiltration membrane system, the various stages of the reverse osmosis system, and the dosing system of this utility model;

[0031] Figure 6 This is a partial flow diagram of the structure of this utility model. Figure 1 ;

[0032] Figure 7 This is a partial flow diagram of the structure of this utility model. Figure 2 ;

[0033] Figure 8 This is a schematic diagram of the structural layout of the primary RO membrane module of this utility model.

[0034] In the diagram: 100, Steel platform; 200, Ultrafiltration membrane system; 210, Ultrafiltration feed pump; 220, Ultrafiltration security filter; 230, Ultrafiltration membrane module; 240, Ultrafiltration product water tank; 250, Ultrafiltration backwash pump; 300, Primary reverse osmosis system; 310, Primary RO feed pump; 320, Primary RO security filter; 330, Primary RO high-pressure pump; 340, Primary RO membrane module; 350, Primary RO product water tank; 360, Primary RO flushing pump; 400, Secondary reverse osmosis system; 410, Secondary RO feed pump; 420, Secondary RO security filter. Filter; 430, Secondary RO high-pressure pump; 440, Secondary RO membrane module; 450, Secondary RO permeate tank; 500, Tertiary reverse osmosis system; 510, Tertiary RO feed pump; 520, Tertiary RO security filter; 530, Tertiary RO high-pressure pump; 540, Tertiary RO membrane module; 600, Chemical cleaning system; 610, Chemical cleaning tank; 620, Chemical cleaning pump; 630, Chemical cleaning security filter; 700, Dosing system; 710, Dosing device A; 720, Dosing device B; 730, Dosing device C; 800, Electrical control system. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Please see Figures 1-8This utility model provides a multi-stage membrane system integrated pilot plant, including a steel platform 100 on which an ultrafiltration membrane system 200, a first-stage reverse osmosis system 300, a second-stage reverse osmosis system 400, a third-stage reverse osmosis system 500, a chemical cleaning system 600, a dosing system 700, and an electrical control system 800 are mounted. The first-stage reverse osmosis system 300 includes a first-stage RO feed pump 310 connected to the ultrafiltration membrane system 200. The outlet of the first-stage RO feed pump 310 is connected to a first-stage RO security filter 320. The outlet of the first-stage RO security filter 320 is connected to a first-stage RO high-pressure pump 330. The outlet of the first-stage RO high-pressure pump 330 is connected to a first-stage RO membrane module 34. The primary RO membrane module 340 has its product water outlet connected to the primary RO product water tank 350, and its outlet connected to the primary RO flushing pump 360. The outlet of the primary RO flushing pump 360 is connected to the clean water flushing inlet of the primary RO feed pump 310. The secondary reverse osmosis system 400 includes a secondary RO feed pump 410 connected in parallel with the primary RO flushing pump 360 and connected to the outlet of the primary RO product water tank 350. The outlet of the secondary RO feed pump 410 is connected to a secondary RO security filter 420, and the outlet of the secondary RO security filter 420 is connected to a secondary RO high-pressure pump 430. The outlet of the secondary RO high-pressure pump 430 is connected to the secondary RO membrane module. The secondary RO membrane module 440 has its product water outlet connected to the secondary RO product water tank 450. The tertiary reverse osmosis system 500 includes a tertiary RO feed pump 510 connected to the outlet of the secondary RO product water tank 450, a tertiary RO security filter 520 connected to the outlet of the tertiary RO security filter 520, a tertiary RO high-pressure pump 530 connected to the outlet of the tertiary RO high-pressure pump 530, a tertiary RO membrane module 540 connected to the product water outlet of the tertiary RO membrane module 540, and a tertiary RO product water tank connected to the product water outlet of the tertiary RO membrane module 540. Each of the primary RO membrane module 340, secondary RO membrane module 440, and tertiary RO membrane module 540 consists of three modules connected in series and contains two... The RO membrane core consists of three membrane housings connected in series via pipes. These three housings (each containing two RO membrane cores) together form a membrane module. The total membrane area is equivalent to that of a single housing containing six RO membrane cores. However, the three-in-series configuration is easier to maintain, adapts to pressure distribution, and allows for a more flexible layout, potentially reducing the floor space required. A steel platform 100 integrates an ultrafiltration membrane system 200, a primary reverse osmosis system 300, a secondary reverse osmosis system 400, and a tertiary reverse osmosis system 500, achieving a unified layout for the multi-stage membrane treatment process. This ensures smooth integration of each system and improves operational continuity. The complete link of each stage of the reverse osmosis system guarantees a progressive improvement in water quality.

[0037] The ultrafiltration membrane system 200 includes an ultrafiltration feed pump 210 connected to the inlet pipe of the pretreatment water tank. The outlet of the ultrafiltration feed pump 210 is connected to an ultrafiltration security filter 220. The outlet of the ultrafiltration security filter 220 is connected to an ultrafiltration membrane module 230. The product water outlet of the ultrafiltration membrane module 230 is connected to an ultrafiltration product water tank 240. The outlet of the ultrafiltration product water tank 240 is connected to an ultrafiltration backwash pump 250. The outlet of the ultrafiltration backwash pump 250 is connected to the backwashing function of the ultrafiltration membrane module 230. Water inlet; the ultrafiltration backwash pump 250 and the first-stage RO feed water pump 310 are connected in parallel and are both connected to the outlet of the ultrafiltration permeate tank 240; the complete structure of the ultrafiltration membrane system 200 can effectively pre-treat raw water, remove impurities, and protect the subsequent reverse osmosis membrane modules; the parallel design of the ultrafiltration backwash pump 250 and the first-stage RO feed water pump 310 can restore the performance of the ultrafiltration membrane and extend its life through backwashing, and also ensure a stable supply of ultrafiltration permeate to the first-stage reverse osmosis system 300, avoiding water supply interruption.

[0038] The air inlet of the ultrafiltration membrane module 230 is connected to a compressed air storage tank, and the ultrafiltration concentrate cross-flow port of the ultrafiltration membrane module 230 is connected to a pretreatment system. The connection of the ultrafiltration membrane module 230 to the compressed air storage tank can enhance the removal effect of pollutants on the membrane surface and improve the backwashing efficiency and membrane module recovery effect through air washing-assisted backwashing. The connection of the ultrafiltration concentrate cross-flow port to the pretreatment system enables the recycling and reprocessing of concentrate, improves water resource utilization, and reduces wastewater discharge.

[0039] The concentrate return port of the first-stage RO membrane module 340, the concentrate discharge port of the second-stage RO membrane module 440, and the concentrate discharge port of the third-stage RO membrane module 540 are connected in parallel. The concentrate discharge port of the first-stage RO membrane module 340 is connected to the owner's compliant treatment system for the first-stage RO concentrate to ensure that the concentrate treatment meets environmental protection requirements. The chemical cleaning return ports of the ultrafiltration membrane module 230, the first-stage RO membrane module 340, the second-stage RO membrane module 440, and the third-stage RO permeate tank are connected in parallel. The parallel connection of the chemical cleaning return ports of each stage of the membrane module makes the chemical cleaning system 600 universally adaptable to each unit that needs cleaning, eliminating the need to set up a separate cleaning loop, simplifying the system structure and reducing costs.

[0040] The concentrate return port of the secondary RO membrane module 440 is connected to the inlet of the primary RO permeate tank 350, and the concentrate return port of the tertiary RO membrane module 540 is connected to the inlet of the secondary RO permeate tank 450. The concentrate from the secondary RO membrane module 440 is returned to the primary RO permeate tank 350, and the concentrate from the tertiary RO membrane module 540 is returned to the secondary RO permeate tank 450, so that the substandard concentrate can re-enter the pretreatment process, which greatly improves the overall water production rate, reduces water waste, and reduces the pressure on subsequent concentrate treatment.

[0041] The chemical cleaning system 600 includes a chemical cleaning tank 610, the outlet of which is connected to a chemical cleaning pump 620. The outlet of the chemical cleaning pump 620 is connected to a chemical cleaning security filter 630, and the outlet of the chemical cleaning security filter 630 is connected to the chemical cleaning inlets of the ultrafiltration membrane module 230, the first-stage RO membrane module 340, the second-stage RO membrane module 440, and the third-stage RO membrane module 540. The chemical cleaning system 600 can accurately deliver the cleaning solution to the cleaning inlets of each membrane module, achieving targeted cleaning of the ultrafiltration and reverse osmosis membrane modules at each stage, effectively removing contaminants, restoring membrane separation performance, and ensuring long-term stable operation of the equipment.

[0042] The chemical cleaning tank 610 is connected in parallel with the chemical cleaning pump 620. The inlet of the chemical cleaning tank 610 is connected to the inlet of the chemical cleaning security filter 630 and each cleaning return port to form a cleaning liquid circulation loop, so as to realize the reuse of cleaning liquid and reduce consumption.

[0043] The dosing system 700 includes dosing devices A710, B720, and C730. Dosing device A710 includes an acid dosing device, an alkali dosing device A, and a sodium hypochlorite dosing device. The dosing pumps of the acid dosing device and the alkali dosing device A are connected to the backwash water inlet of the ultrafiltration membrane module 230. The dosing pump of the sodium hypochlorite dosing device is connected to the backwash water inlet of the ultrafiltration membrane module 230 and the inlet of the ultrafiltration security filter 220. Dosing device A710 provides dosing for the ultrafiltration membrane backwashing and inlet water processes, ensuring the backwashing effect of the ultrafiltration membrane and the quality of the inlet water. Dosing device B720 includes a scale inhibitor dosing device, a reducing agent dosing device, and a non-oxidizing bactericide dosing device. The dosing pumps for the scale inhibitor, reducing agent, and non-oxidizing bactericide dosing devices are all connected to the inlet of the primary RO security filter 320. Dosing device B720 adds scale inhibitors, reducing agents, and bactericides to the primary RO feed water to prevent scaling, oxidation, and microbial contamination of the primary RO membrane. Dosing device C730 includes alkali dosing device B, whose dosing pump is connected to the inlets of the secondary RO security filter 420 and the tertiary RO security filter 520. Dosing device C730 adds alkali to the secondary and tertiary RO feed water to optimize feed water conditions, ensure subsequent separation efficiency, achieve precise chemical control at each stage, and comprehensively protect the membrane components.

[0044] The ultrafiltration membrane system 200, the first-stage reverse osmosis system 300, the second-stage reverse osmosis system 400, the third-stage reverse osmosis system 500, the chemical cleaning system 600, and the dosing system 700 are all controlled by the electrical control system 800. The electrical control system 800 includes a power distribution system and a PLC control system, which provides centralized control of the ultrafiltration membrane system 200, the first-stage reverse osmosis system 300, the second-stage reverse osmosis system 400, the third-stage reverse osmosis system 500, the chemical cleaning system 600, and the dosing system 700. The centralized control of all subsystems by the electrical control system 800 can synchronously monitor and regulate the operating parameters of each system, avoid errors caused by individual manual operation, improve operational convenience and parameter accuracy, facilitate automated operation of equipment, reduce manual intervention, lower operational risks, and ensure stable and controllable pilot-scale operation.

[0045] The steel platform 100 has a two-layer platform structure. The ultrafiltration inlet pump 210, ultrafiltration security filter 220, ultrafiltration product water tank 240, ultrafiltration backwash pump 250, primary RO inlet pump 310, primary RO security filter 320, primary RO product water tank 350, primary RO flushing pump 360, secondary RO inlet pump 410, secondary RO security filter 420, secondary RO product water tank 450, tertiary RO inlet pump 510, tertiary RO security filter 520, chemical cleaning tank 610, chemical cleaning pump 620, chemical cleaning security filter 630, and electrical control system 800 are respectively installed on the lower platform of the steel platform 100. The ultrafiltration membrane module 230, ... The first-stage RO high-pressure pump 330, the first-stage RO membrane module 340, the second-stage RO high-pressure pump 430, the second-stage RO membrane module 440, the third-stage RO high-pressure pump 530, the third-stage RO membrane module 540, the dosing device A710, the dosing device B720, and the dosing device C730 are respectively installed on the upper platform of the steel platform 100. The partitioned layout of the two-layer steel platform 100 places the heavier pumps, storage tanks, and electrical control system 800, which require frequent operation, on the lower layer for easy maintenance and operation. The membrane module, high-pressure pump, and dosing device 700 are placed on the upper layer to avoid interference from the equipment on the lower layer to the operation of the membrane module. At the same time, it optimizes the spatial hierarchy, reduces the overall footprint, and improves the convenience of on-site operation.

[0046] The working principle of this utility model is as follows:

[0047] Pretreatment stage: Raw water is transported to the ultrafiltration membrane system 200 via the pretreatment tank. The ultrafiltration feed water pump 210 sends the raw water into the ultrafiltration security filter 220 to remove large particulate impurities, and then into the ultrafiltration membrane module 230 to remove colloids, suspended solids and other impurities. The treated ultrafiltration permeate is stored in the ultrafiltration permeate tank 240. When the performance of the ultrafiltration membrane deteriorates, the ultrafiltration backwash pump 250 delivers backwash water (which can be used in conjunction with the chemicals in the dosing device A710) to backwash the membrane and restore its performance.

[0048] Step-by-step depth separation stage:

[0049] First-stage reverse osmosis: Ultrafiltration permeate is sent to the first-stage RO security filter 320 through the first-stage RO feed water pump 310, and after being pressurized by the first-stage RO high-pressure pump 330, it enters the first-stage RO membrane module 340 for desalination. The permeate is stored in the first-stage RO permeate tank 350, and the first-stage RO flushing pump 360 is used for system flushing.

[0050] Two-stage reverse osmosis: The primary RO permeate is sent to the secondary RO security filter 420 through the secondary RO feed pump 420, and after being pressurized by the secondary RO high-pressure pump 430, it enters the secondary RO membrane module 440. The permeate is stored in the secondary RO permeate tank 450, and the secondary RO concentrate is returned to the primary RO permeate tank 350 for reprocessing.

[0051] Three-stage reverse osmosis: The secondary RO permeate is sent to the tertiary RO security filter 520 through the tertiary RO feed pump 510, and after being pressurized by the tertiary RO high-pressure pump 530, it enters the tertiary RO membrane module 540. Finally, the permeate is stored in the tertiary RO permeate tank, and the tertiary RO concentrate is returned to the secondary RO permeate tank 450 for reprocessing.

[0052] Auxiliary support phase: The dosing system 700 precisely administers chemicals through three devices: dosing device A710 ensures ultrafiltration membrane backwashing and feed water quality, dosing device B720 prevents primary RO membrane fouling, and dosing device C730 optimizes secondary and tertiary RO feed water conditions; the chemical cleaning system 600, when membrane module performance deteriorates, delivers cleaning solution through chemical cleaning tank 610, chemical cleaning pump 620, and chemical cleaning security filter 630 to circulate and clean the ultrafiltration and RO membrane modules at all levels, restoring membrane performance;

[0053] Centralized control phase: The electrical control system monitors the operating parameters of all subsystems in real time (such as pump start / stop, reagent dosage, and cleaning timing), and synchronously regulates the operation of each system to ensure that the entire pilot-scale process is stable, efficient, and controllable, and ultimately outputs reliable process scale-up data.

[0054] All parts not described in this utility model are the same as or can be implemented using existing technology. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage membrane system integrated pilot plant apparatus, characterized by, It includes a steel platform (100) on which are installed an ultrafiltration membrane system (200), a primary reverse osmosis system (300), a secondary reverse osmosis system (400), a tertiary reverse osmosis system (500), a chemical cleaning system (600), a dosing system (700), and an electrical control system (800), wherein: The primary reverse osmosis system (300) includes a primary RO feed pump (310) connected to an ultrafiltration membrane system (200). The outlet of the primary RO feed pump (310) is connected to a primary RO security filter (320). The outlet of the primary RO security filter (320) is connected to a primary RO high-pressure pump (330). The outlet of the primary RO high-pressure pump (330) is connected to a primary RO membrane module (340). The product water outlet of the primary RO membrane module (340) is connected to a primary RO product water tank (350). The outlet of the primary RO product water tank (350) is connected to a primary RO flushing pump (360). The outlet of the primary RO flushing pump (360) is connected to the clean water flushing inlet of the primary RO feed pump (310). The secondary reverse osmosis system (400) includes a secondary RO feed pump (410) connected in parallel with the primary RO flushing pump (360) and connected to the outlet of the primary RO product water tank (350). The outlet of the secondary RO feed pump (410) is connected to a secondary RO security filter (420). The outlet of the secondary RO security filter (420) is connected to a secondary RO high-pressure pump (430). The outlet of the secondary RO high-pressure pump (430) is connected to a secondary RO membrane module (440). The product water outlet of the secondary RO membrane module (440) is connected to the secondary RO product water tank (450). The three-stage reverse osmosis system (500) includes a three-stage RO feed pump (510) connected to the outlet of the two-stage RO permeate tank (450), the outlet of the three-stage RO feed pump (510) is connected to a three-stage RO security filter (520), the outlet of the three-stage RO security filter (520) is connected to a three-stage RO high-pressure pump (530), the outlet of the three-stage RO high-pressure pump (530) is connected to a three-stage RO membrane module (540), and the permeate outlet of the three-stage RO membrane module (540) is connected to the three-stage RO permeate tank. The first-stage RO membrane module (340), the second-stage RO membrane module (440), and the third-stage RO membrane module (540) are all composed of three membrane shells connected in series and each containing two RO membrane cores. The three membrane shells connected in series are connected by pipes.

2. The integrated pilot plant of multiple stage membrane system according to claim 1, characterized in that: The ultrafiltration membrane system (200) includes an ultrafiltration feed pump (210) connected to the inlet pipe of the pretreatment water tank. The outlet of the ultrafiltration feed pump (210) is connected to an ultrafiltration security filter (220). The outlet of the ultrafiltration security filter (220) is connected to an ultrafiltration membrane module (230). The outlet of the ultrafiltration membrane module (230) is connected to an ultrafiltration product water tank (240). The outlet of the ultrafiltration product water tank (240) is connected to an ultrafiltration backwash pump (250). The outlet of the ultrafiltration backwash pump (250) is connected to the backwash water inlet of the ultrafiltration membrane module (230). The ultrafiltration backwash pump (250) and the first-stage RO feed pump (310) are connected in parallel and are both connected to the outlet of the ultrafiltration product water tank (240).

3. The integrated pilot plant of multiple stage membrane system according to claim 2, characterized in that: The air inlet of the ultrafiltration membrane module (230) is connected to a compressed air storage tank, and the ultrafiltration concentrate crossflow port of the ultrafiltration membrane module (230) is connected to a pretreatment system.

4. The integrated pilot plant of multiple stage membrane system according to claim 3, characterized in that: The concentrate return port of the primary RO membrane module (340), the concentrate discharge port of the secondary RO membrane module (440), and the concentrate discharge port of the tertiary RO membrane module (540) are connected in parallel. The concentrate discharge port of the primary RO membrane module (340) is connected to the primary RO concentrate owner compliance treatment system. The chemical cleaning return port of the ultrafiltration membrane module (230), the primary RO membrane module (340), the secondary RO membrane module (440), and the tertiary RO permeate tank are connected in parallel.

5. The integrated pilot plant of multiple stage membrane system according to claim 4, characterized in that: The concentrate return port of the secondary RO membrane module (440) is connected to the inlet of the primary RO permeate tank (350), and the concentrate return port of the tertiary RO membrane module (540) is connected to the inlet of the secondary RO permeate tank (450).

6. The multi-stage membrane system integrated pilot plant according to claim 5, characterized in that: The chemical cleaning system (600) includes a chemical cleaning tank (610), the outlet of which is connected to a chemical cleaning pump (620), the outlet of which is connected to a chemical cleaning security filter (630), and the outlet of which is connected to the chemical cleaning inlet of an ultrafiltration membrane module (230), a primary RO membrane module (340), a secondary RO membrane module (440), and a tertiary RO membrane module (540).

7. The integrated pilot plant of multiple stage membrane system according to claim 6, characterized in that: The chemical cleaning tank (610) is connected in parallel with the chemical cleaning pump (620). The inlet of the chemical cleaning tank (610) is connected to the inlet of the chemical cleaning security filter (630) and each cleaning return port to form a cleaning liquid circulation loop.

8. The integrated pilot plant of multiple stage membrane system according to claim 7, characterized in that: The dosing system (700) includes dosing device A (710), dosing device B (720), and dosing device C (730), wherein: The dosing device A (710) includes an acid dosing device, an alkali dosing device A and a sodium hypochlorite dosing device. The dosing pumps of the acid dosing device and the alkali dosing device A are connected to the backwash water inlet of the ultrafiltration membrane module (230). The dosing pump of the sodium hypochlorite dosing device is connected to the backwash water inlet of the ultrafiltration membrane module (230) and the inlet of the ultrafiltration security filter (220). The dosing device B (720) includes a scale inhibitor dosing device, a reducing agent dosing device and a non-oxidizing bactericide dosing device, and the dosing pumps of the scale inhibitor dosing device, the reducing agent dosing device and the non-oxidizing bactericide dosing device are all connected to the inlet of the primary RO security filter (320). The dosing device C (730) includes an alkali dosing device B, whose dosing pump is connected to the inlet of the secondary RO security filter (420) and the tertiary RO security filter (520).

9. The integrated pilot plant of multiple stage membrane system according to claim 8, characterized in that: The ultrafiltration membrane system (200), the first-stage reverse osmosis system (300), the second-stage reverse osmosis system (400), the third-stage reverse osmosis system (500), the chemical cleaning system (600), and the dosing system (700) are all controlled by the electrical control system (800). The electrical control system (800) includes a power distribution system and a PLC control system, which can centrally control the ultrafiltration membrane system (200), the first-stage reverse osmosis system (300), the second-stage reverse osmosis system (400), the third-stage reverse osmosis system (500), the chemical cleaning system (600), and the dosing system (700).

10. The integrated pilot plant of multiple stage membrane system according to claim 9, characterized in that: The steel platform (100) has a two-layer platform structure, and includes an ultrafiltration inlet pump (210), an ultrafiltration security filter (220), an ultrafiltration product water tank (240), an ultrafiltration backwash pump (250), a primary RO inlet pump (310), a primary RO security filter (320), a primary RO product water tank (350), a primary RO flushing pump (360), a secondary RO inlet pump (410), a secondary RO security filter (420), a secondary RO product water tank (450), a tertiary RO inlet pump (510), a tertiary RO security filter (520), and a chemical cleaning tank (610). The chemical cleaning pump (620), chemical cleaning security filter (630) and electrical control system (800) are respectively installed on the lower platform of the steel platform (100), and the ultrafiltration membrane module (230), the first-stage RO high-pressure pump (330), the first-stage RO membrane module (340), the second-stage RO high-pressure pump (430), the second-stage RO membrane module (440), the third-stage RO high-pressure pump (530), the third-stage RO membrane module (540), the dosing device A (710), the dosing device B (720) and the dosing device C (730) are respectively installed on the upper platform of the steel platform (100).

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