Integrated water treatment device based on coupling of air flotation process and double-membrane filtration

Abstract

The utility model provides an integrated water treatment device based on air floatation process coupling double-membrane filtration. The device comprises a coagulant feeding system, an air floatation system, a double-membrane filtration system and a cleaning system. The air flotation system comprises a mechanical flocculation tank, an air flotation tank and an air-dissolved water module, the double-membrane filtration system comprises an ultrafiltration membrane module and a nanofiltration membrane module, the coagulant adding system is arranged on a raw water pipeline at the water inlet end of the device and is connected with the raw water pipeline through a pipeline, and a water inlet of the air flotation system is connected with the raw water pipeline. And a water outlet of the air flotation system is connected with a water inlet of the double-membrane filtration system through a pipeline. The cleaning system further comprises a physical cleaning module and a chemical cleaning module. According to the utility model, pollutants in water can be effectively removed, the effluent of the equipment is ensured to meet the water quality requirement, and the device also has the advantages of high stability, high automation degree, strong impact load resistance and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification treatment, and in particular to an integrated water treatment device based on air flotation process coupled with double membrane filtration. Background Art

[0002] At present, water treatment processes in various parts of my country mostly adopt conventional treatment processes based on "coagulation-sedimentation-filtration-disinfection" or deep treatment processes based on "ozone-activated carbon process", while there is little research on conventional treatment processes based on "flotation process" and membrane treatment technology based on "ultrafiltration-nanofiltration double membrane filtration system".

[0003] The flotation process is a solid-liquid separation technology that mainly uses the buoyancy of gas in water to float tiny particles or substances such as oil and fat suspended in the water, thereby achieving the purpose of filtering and cleaning the water.

[0004] The main working principle of membrane treatment technology is to use the pressure gradient as the driving force and the permeability of a specific membrane to separate ions, molecules and impurities in water to perform mechanical screening of the filter membrane. According to the different membrane pore sizes, it can be divided into four types: microfiltration, ultrafiltration, nanofiltration and reverse osmosis. Among them, the pore size of the ultrafiltration membrane is generally between 5 nanometers and 100 nanometers, which can effectively intercept macromolecular organic matter, colloids, viruses, bacteria and other tiny particles in the water; the pore size of the nanofiltration membrane is generally between 1 nanometer and 10 nanometers, which can effectively intercept organic matter, soluble salts, heavy metal ions and other tiny particles in the water. As a kind of membrane treatment technology, the ultrafiltration-nanofiltration double membrane filtration system effectively combines the advantages of both ultrafiltration membrane and nanofiltration membrane, and uses ultrafiltration to intercept macromolecular organic matter, particle number, turbidity, bacteria and viruses, effectively alleviating the pollution of the nanofiltration membrane, while nanofiltration will continue to remove the remaining soluble small molecule organic matter and microorganisms, effectively ensuring the chemical and biological safety of water. It is one of the research and application hotspots in the water treatment industry at home and abroad in recent years.

[0005] In response to water pollution, traditional water treatment devices often have problems such as large footprint, long process flow, frequent membrane fouling, etc., which increases the cost of water treatment. Utility Model Content

[0006] In order to solve the above problems, the utility model proposes an integrated water treatment device based on flotation process coupled with double membrane filtration. The water treatment device includes: a raw water pipeline, a coagulant dosing system, an air flotation system, a double membrane filtration system, and a final water outlet pipeline of the equipment.

[0007] Wherein, the flotation system includes a mechanical flocculation tank, an air flotation tank, a mechanical flocculation tank perforated flower wall and a dissolved air water module;

[0008] The double-membrane filtration system comprises an ultrafiltration membrane module, a nanofiltration membrane module and a filter tank connecting pipeline.

[0009] The coagulant addition system is arranged on the raw water pipeline at the water inlet end of the device and is connected to the raw water pipeline through a pipeline; the raw water pipeline is connected to the water inlet of the mechanical flocculation tank; the perforated flower wall of the mechanical flocculation tank is arranged between the mechanical flocculation tank and the flotation tank, and the flower wall perforations arranged at the lower part of the perforated flower wall of the mechanical flocculation tank connect the mechanical flocculation tank and the flotation tank; the dissolved air water module is used to dissolve water and air, and inject the dissolved water gas into the flotation tank; the water outlet of the flotation tank is connected to the water inlet of the ultrafiltration membrane module through a pipeline; the water outlet of the ultrafiltration membrane module is connected to the water inlet of the nanofiltration membrane module through the filter tank connecting pipeline; the water outlet of the nanofiltration membrane module is connected to the final water outlet pipeline of the equipment; the final water outlet pipeline of the equipment is controllably connected to the outside world.

[0010] In one embodiment, the coagulant dosing system further includes: a coagulant tank, a coagulant dosing pump, and a coagulant dosing pipeline.

[0011] The coagulant medicine box is connected to the raw water pipeline through a coagulant dosing pipeline, and the coagulant dosing pump is arranged on the coagulant dosing pipeline.

[0012] In one embodiment, the mechanical flocculation tank further comprises: a mechanical agitator and a perforated wall of the mechanical flocculation tank.

[0013] The raw water pipeline is connected to the water inlet of the mechanical flocculation tank; the mechanical agitator is arranged in the mechanical flocculation tank; the perforated flower wall of the mechanical flocculation tank connects the mechanical flocculation tank with the bottom of the flotation tank.

[0014] In one embodiment, the flotation tank is divided into two areas: a flotation area and a flotation outlet area.

[0015] The flotation tank also includes: a mud scraper, a perforated pipe of the flotation tank, a bottom discharge pipe of the flotation tank, and a mud discharge pipe of the flotation tank.

[0016] The dissolved air water module also includes a dissolved air water releaser, a dissolved air pump, an air compressor, a compressed air tank, a dissolved air device, an air inlet pipeline of the dissolved air device, a water inlet pipeline of the dissolved air device and a dissolved air water pipeline of the dissolved air device.

[0017] The flotation area is connected to the flotation outlet area through the flotation pool perforated pipe; the scraper is arranged above the flotation area, and a flotation mud discharge tank is arranged above the flotation area to receive the sludge scraped out by the scraper; the flotation mud discharge tank is connected to the outside world through the flotation pool mud discharge pipe; the flotation pool lower discharge pipe is arranged below the flotation area and is controllably connected to the outside world. The drainage outlet below the flotation outlet area is connected to the gas dissolving device through a pipeline; the drainage outlet below the flotation outlet area is also connected to the water inlet of the ultrafiltration membrane module through a pipeline.

[0018] The dissolved air device utilizes the dissolved air pump to extract water from the flotation pool from the bottom drain port of the flotation water outlet area through the dissolved air pump water inlet pipeline; the air compressor is connected to the compressed air tank through a pipeline, and the compressed air tank outlet intakes air to the dissolved air device through the dissolved air device air inlet pipeline; the dissolved air device releases dissolved air water to the flotation pool through the dissolved air water pipeline of the dissolved air device using the dissolved air water releaser, and the dissolved air water releaser is arranged at the bottom of the flotation area.

[0019] In one embodiment, the ultrafiltration membrane module further includes: an ultrafiltration membrane booster pump, an ultrafiltration membrane water inlet pipeline, an ultrafiltration membrane assembly, an ultrafiltration membrane water outlet pipeline, an ultrafiltration water tank inlet pipeline, an ultrafiltration membrane mixed water outlet pipeline and an ultrafiltration water tank.

[0020] The water inlet of the ultrafiltration membrane assembly is connected to the flotation tank through an ultrafiltration membrane water inlet pipeline; the water outlet of the ultrafiltration membrane assembly is connected to the water inlet of the ultrafiltration water tank through an ultrafiltration membrane water outlet pipeline and an ultrafiltration water tank water inlet pipeline; the ultrafiltration membrane booster pump is arranged on the ultrafiltration water inlet pipeline.

[0021] In one embodiment, the ultrafiltration membrane assembly is a ceramic ultrafiltration membrane assembly with a membrane pore size of 0.05 μm and a membrane area of ​​25 m 2 , membrane flux is 100~200L / (m 2 h), the operation mode is dead-end filtration.

[0022] In one embodiment, the nanofiltration membrane module further comprises: a nanofiltration membrane booster pump, a nanofiltration membrane water inlet pipeline, a nanofiltration membrane assembly, a nanofiltration membrane water outlet pipeline, a nanofiltration membrane concentrated water pipeline, and a final water outlet pipeline of the equipment;

[0023] The nanofiltration membrane water inlet is connected to the ultrafiltration water tank outlet through a nanofiltration membrane water inlet pipeline; a nanofiltration membrane booster pump is arranged on the nanofiltration membrane water inlet pipeline; the nanofiltration membrane water outlet pipeline connects the final water outlet pipeline of the equipment and the ultrafiltration membrane mixing water outlet pipeline; the water outlet end of the nanofiltration membrane module is connected to the nanofiltration membrane concentrate pipeline; the nanofiltration membrane concentrate pipeline is controllably connected to the outside world.

[0024] In one embodiment, the nanofiltration membrane module uses two rolled nanofiltration membrane modules in parallel operation, the membrane pore size is 1nm, and the single membrane area is 37.2m 2, membrane flux is 20~40L / (m 2 h), the operation mode is cross-flow filtration.

[0025] In one embodiment, the water treatment device further comprises a cleaning system.

[0026] The cleaning system includes a physical cleaning module, which specifically includes a water backwashing pump, a water backwashing pipeline, a backwashing pipeline, an air backwashing pipeline, an ultrafiltration membrane lower discharge pipeline, an ultrafiltration membrane upper discharge pipeline, an air compressor and a compressed air tank.

[0027] The water backwash pump is arranged on the water backwash pipeline, and the ultrafiltration water tank is connected to the ultrafiltration membrane assembly through the water backwash pipeline and the backwash pipeline; the air compressor and the compressed air tank are connected to the ultrafiltration membrane assembly through the backwash pipeline and the air backwash pipeline; the ultrafiltration membrane lower discharge pipeline is connected to the waste discharge port below the ultrafiltration membrane assembly, and the ultrafiltration membrane upper discharge pipeline is located at the waste discharge port above the ultrafiltration membrane assembly.

[0028] In one embodiment, the cleaning system further includes a chemical cleaning module.

[0029] The chemical cleaning module includes an ultrafiltration membrane circulation pipeline, an ultrafiltration membrane chemical cleaning drug inlet pipeline, a nanofiltration membrane circulation pipeline, a nanofiltration membrane effluent circulation pipeline, a nanofiltration membrane concentrated water circulation pipeline, a nanofiltration membrane chemical cleaning drug inlet pipeline, a nanofiltration membrane assembly discharge pipeline, a chemical cleaning medicine box, a chemical cleaning drug dosing pump, and a chemical cleaning drug dosing pipeline.

[0030] The ultrafiltration membrane circulation pipeline is connected to the ultrafiltration membrane water inlet pipeline, the ultrafiltration membrane booster pump, the ultrafiltration membrane assembly and the ultrafiltration membrane water outlet pipeline; the nanofiltration membrane circulation pipeline is connected to the nanofiltration membrane water inlet pipeline, the nanofiltration membrane booster pump, the nanofiltration membrane assembly, the nanofiltration membrane water outlet circulation pipeline and the nanofiltration membrane concentrated water circulation pipeline.

[0031] The chemical cleaning medicine box is connected to the ultrafiltration membrane chemical cleaning medicine inlet pipeline and the nanofiltration membrane chemical cleaning medicine inlet pipeline through a chemical cleaning medicine dosing pipe, and the chemical cleaning medicine dosing pump is arranged on the chemical cleaning medicine dosing pipe; the ultrafiltration membrane chemical cleaning medicine inlet pipeline is connected to the ultrafiltration membrane module medicine inlet port; the nanofiltration membrane chemical cleaning medicine inlet pipeline is connected to the nanofiltration membrane module medicine inlet port.

[0032] In one embodiment, an online monitoring system is provided on the final water outlet pipeline of the water treatment device, and the online monitoring system includes a temperature monitor, a pH monitor, a turbidity monitor, a colorimetry monitor, a potassium permanganate index monitor, and an ammonia nitrogen monitor.

[0033] The implementation of the present invention can at least produce the following beneficial technical effects:

[0034] The utility model adopts the flotation process to replace the traditional coagulation, sedimentation and filtration process, shortens the process flow, reduces the floor space under the premise of meeting the water quality requirements, and the flotation process as the first treatment process of the treatment device can effectively remove suspended particles, grease and sludge and other insoluble substances in the water, and can also remove some soluble substances, which can effectively reduce the membrane pollution of the subsequent double membrane filtration system. The utility model adopts ultrafiltration membrane filtration as the first treatment process of the double membrane filtration system, and through the microporous blocking effect of the ultrafiltration membrane, the larger molecular pollutants such as soluble substances, suspended particles, colloids, bacteria, etc. are retained on the membrane surface, achieving effective removal of pollutants, and can reduce the working pressure of the subsequent nanofiltration membrane system. The utility model adopts nanofiltration membrane filtration as the last treatment process of the treatment device, which can intercept most of the organic and inorganic molecules, colloidal particles, viruses, bacteria and other tiny substances in the water through the porous membrane material with smaller pore size, and can effectively remove trace organic pollutants, heavy metal ions, radioactive nuclides, etc. in the water, and can also retain water molecules and some small molecular inorganic salts. The utility model can achieve efficient removal of various pollutants in water by coupling the flotation process with the double membrane filtration method. The final effluent of the equipment can achieve the removal of 99% of turbidity, 90% of chromaticity, 90% of permanganate index and 90% of ammonia nitrogen, which can effectively meet people's requirements for water quality. Compared with the traditional water treatment process, the water treatment device of the utility model has the advantages of reasonable process design, high operating stability, simple installation and high degree of automation, which can better meet people's requirements for water quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0036] Figure 1 It is a schematic diagram of a framework of an integrated water treatment device based on air flotation process coupled with double membrane filtration provided in an embodiment of the present application;

[0037] Figure 2 It is a structural schematic diagram of an integrated water treatment device based on air flotation process coupled with double membrane filtration provided in an embodiment of the present application;

[0038] Reference numerals:

[0039] 1-coagulant medicine box; 2-coagulant dosing pump; 3-coagulant dosing pipeline; 4-raw water pipeline; 5-mechanical flocculation tank; 6-mechanical agitator; 7-perforated flower wall of mechanical flocculation tank; 8-flotation area of ​​flotation tank; 9-sludge scraper; 10-perforated pipe of flotation tank; 11-flotation tank lower discharge pipe 1; 12-flotation tank lower discharge pipe 2; 13-flotation tank mud discharge pipe; 14-flotation water outlet area of ​​flotation tank; 15-air compressor; 16-compressed air tank; 17-air inlet pipeline of dissolved air device; 18-dissolved air device; 19 - air dissolving pump; 20-water inlet pipeline of air dissolving device; 21-water pipeline of air dissolving device; 22-water dissolving water releaser; 23-Ultrafiltration membrane booster pump; 24-water inlet pipeline of ultrafiltration membrane; 25-water outlet pipeline of ultrafiltration membrane; 26-water inlet pipeline of ultrafiltration water tank; 27-water outlet pipeline of ultrafiltration membrane blending; 28-Ultrafiltration membrane assembly; 29-water backwash pump; 30-water backwash pipeline; 31-backwash pipeline; 32-air backwash pipeline; 33-lower discharge pipeline of ultrafiltration membrane; 34-upper discharge pipeline of ultrafiltration membrane; 35-circulation of ultrafiltration membrane Circulation pipeline; 36-Ultrafiltration membrane chemical cleaning drug inlet pipeline; 37-Nanofiltration membrane booster pump; 38-Nanofiltration membrane water inlet pipeline; 39-Nanofiltration membrane assembly No. 1; 40-Nanofiltration membrane assembly No. 2; 41-Nanofiltration membrane outlet pipeline; 42-Nanofiltration membrane concentrated water pipeline; 43-Equipment final outlet pipeline; 44-Nanofiltration membrane assembly No. 1 discharge pipeline; 45-Nanofiltration membrane assembly No. 2 discharge pipeline; 46-Nanofiltration membrane outlet circulation pipeline; 47-Nanofiltration membrane concentrated water circulation pipeline; 48-Nanofiltration membrane circulation pipeline; 49-Nanofiltration membrane chemical Clean the drug supply pipeline; 50-sodium hydroxide medicine box; 51-sodium hypochlorite medicine box; 52-citric acid medicine box; 53-sodium hydroxide dosing pump; 54-sodium hypochlorite dosing pump; 55-citric acid dosing pump; 56-sodium hydroxide dosing pipeline; 57-sodium hypochlorite dosing pipeline; 58-citric acid dosing pipeline; 59-temperature monitor; 60-PH monitor; 61-turbidity monitor; 62-color monitor; 63-permanganate index monitor; 64-ammonia nitrogen monitor; 65-ultrafiltration water tank. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs. Although any methods and materials similar or equivalent to those described herein can also be used in the practice or testing of the present disclosure, exemplary methods and materials are now described.

[0042] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0043] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0044] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various parts under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] See also Figure 1 The utility model discloses an integrated water treatment device based on flotation process coupled with double membrane filtration, the device mainly comprises: a raw water pipeline, a coagulant dosing system, an air flotation system and a double membrane filtration system, and a final water outlet pipeline of the equipment.

[0046] Specifically, the air flotation system includes a mechanical flocculation tank, an air flotation tank, a mechanical flocculation tank perforated wall and a dissolved air water module. The double membrane filtration system includes an ultrafiltration membrane module, a nanofiltration membrane module and a filter tank connecting pipeline. The coagulant addition system is arranged on the raw water pipeline at the water inlet end of the device and is connected to the raw water pipeline through a pipeline; the water inlet of the flotation system is connected to the raw water pipeline 4; the water outlet of the flotation system is connected to the water inlet of the double membrane filtration system through a pipeline; the raw water pipeline 4 is connected to the water inlet of the mechanical flocculation tank 5; the mechanical flocculation tank perforated flower wall 7 is arranged between the mechanical flocculation tank 5 and the flotation tank 8, and the flower wall perforations arranged at the lower part of the perforated flower wall of the mechanical flocculation tank connect the mechanical flocculation tank and the flotation tank; the dissolved air water module is used to dissolve water and air, and inject the dissolved water gas into the flotation tank; the water outlet of the flotation tank is connected to the water inlet of the ultrafiltration membrane module through a pipeline; the water outlet of the ultrafiltration membrane module is connected to the water inlet of the nanofiltration membrane module through the filter tank connecting pipeline; the water outlet of the nanofiltration membrane module is connected to the final water outlet pipeline 43 of the equipment; the final water outlet pipeline 43 of the equipment is controllably connected to the outside.

[0047] Specifically, Figure 2As shown, the coagulant dosing system also includes: a coagulant tank 1, a coagulant dosing pump 2, and a coagulant dosing pipeline 3. The coagulant tank 1 is connected to the raw water pipeline 4 through the coagulant dosing pipeline 3, and the coagulant dosing pump 2 is arranged on the coagulant dosing pipeline 3. The coagulant dosing system can add the coagulant in the coagulant tank to the raw water pipeline 4 through the coagulant dosing pump 2 and the coagulant dosing pipeline 3 to fully mix with the raw water. A separate coagulant dosing system is arranged on the raw water pipeline 4 to facilitate the replacement of coagulants with different properties.

[0048] Preferably, the type of coagulant added can be set to polyaluminium chloride, aluminium sulfate or ferric chloride and other coagulants that can be used for water production, and the addition amount is 5-15 mg / L.

[0049] Specifically, Figure 2 As shown, the mechanical flocculation tank 5 also includes: a mechanical agitator 6 and a mechanical flocculation tank perforated flower wall 7. The raw water pipeline is connected to the water inlet of the mechanical flocculation tank 5, the mechanical agitator 6 is arranged in the mechanical flocculation tank 5, and the mechanical flocculation tank perforated flower wall 7 connects the mechanical flocculation tank 5 with the bottom of the flotation tank. The raw water fully mixed with the coagulant is transported to the mechanical flocculation tank 5 through the raw water pipeline 4, and the stirring action of the mechanical agitator 6 can promote the aggregation of suspended matter and colloidal substances in the water.

[0050] Preferably, the length, width and height of the mechanical flocculation tank 5 are 600mm*600mm*2000mm respectively, and the stirring speed of the agitator is set to 100-300r / min.

[0051] Specifically, Figure 2 As shown, the flotation tank is divided into two areas: the flotation area 8 and the flotation outlet area 14. The flotation tank further includes: a scraper 9, a flotation tank perforated pipe 10, a flotation tank lower discharge pipe 12, and a flotation tank mud discharge pipe 13. The flotation area 8 is connected to the flotation outlet area 14 through the flotation tank perforated pipe 10. The dissolved air water module also includes a dissolved air water releaser 22, a dissolved air pump 19, an air compressor 15, a compressed air tank 16, a dissolved air device 18, a dissolved air device air inlet pipeline 17, a dissolved air device water inlet pipeline 20, and a dissolved air device dissolved air water pipeline 21. The scraper 9 is arranged above the flotation area 8, and a flotation mud discharge trough is arranged above the flotation area 8 to receive the sludge scraped out by the scraper 9; the flotation mud discharge trough is connected to the outside world through the flotation tank mud discharge pipe 13; the flotation tank lower discharge pipe 12 is arranged below the flotation area and is controllably connected to the outside world. The drainage outlet below the air flotation water outlet area is connected to the air dissolving device 18 through a pipeline; the drainage outlet below the air flotation water outlet area is also connected to the water inlet of the ultrafiltration membrane module through a pipeline.

[0052] Furthermore, the dissolved air device 18 utilizes the dissolved air pump 19 to extract water from the flotation pool from the bottom drain port of the flotation outlet area through the dissolved air device water inlet pipe 20. The air compressor is connected to the compressed air tank through a pipeline. The air outlet of the compressed air tank supplies air to the dissolved air device 18 through the dissolved air device air inlet pipe. The dissolved air device 18 releases dissolved air to the flotation pool through the dissolved air device dissolved water pipe 21 using the dissolved air water releaser 22. The dissolved air water releaser 22 is arranged at the bottom of the flotation area.

[0053] Specifically, in this embodiment, the water treated by the mechanical flocculation tank 5 is transported to the flotation tank through the perforated flower wall of the mechanical flocculation tank. On the other hand, in this embodiment, the dissolved air water is released by the dissolved air water releaser 22 to contact the water to be treated in the flotation area, and the tiny bubbles formed by the dissolved air water in the water are used to react with the suspended matter and the colloidal substances, so that they are attached to the bubbles and float to the liquid surface together with the bubbles, thereby removing the suspended matter, colloidal substances and some dissolved substances in the water from the water. The water treated by the dissolved air water will be transported from the flotation area 8 to the flotation water outlet area 14 through the perforated pipe of the flotation tank, and the sludge formed by pollutants such as suspended matter, colloidal substances and some dissolved substances in the water will be discharged to the outside through the scraper 9 and the flotation tank mud discharge pipe 13. The dissolved air water module transports the effluent from the flotation tank to the dissolved air device 18 through the dissolved air pump 19 and the dissolved air device water inlet pipeline 20, and transports compressed air to the dissolved air device 18 through the air compressor 15, the compressed air tank 16 and the dissolved air device air inlet pipeline 17. After the dissolved air is formed by the dissolved air device 18, the dissolved air is released to the flotation tank through the dissolved air water releaser 22 and the dissolved air water pipeline 21 of the dissolved air device.

[0054] Preferably, the length, width and height of the flotation pool are 2400mm*600mm*2000mm respectively, the length, width and height of the flotation zone are 1800mm*600mm*2000mm respectively, and the length, width and height of the flotation outlet zone are 600mm*600mm*2000mm respectively.

[0055] Preferably, the air flotation reflux ratio in the dissolved air water module is between 1:1 and 1:3.

[0056] Specifically, Figure 2 As shown, the ultrafiltration membrane module also includes: an ultrafiltration membrane booster pump 23, an ultrafiltration membrane water inlet pipeline 24, an ultrafiltration membrane assembly 28, an ultrafiltration membrane water outlet pipeline 25, an ultrafiltration water tank water inlet pipeline 26, an ultrafiltration membrane blending water outlet pipeline 27 and an ultrafiltration water tank 65. The water inlet of the ultrafiltration membrane assembly 28 is connected to the air flotation tank through the ultrafiltration membrane water inlet pipeline 24; the water outlet of the ultrafiltration membrane assembly 28 is connected to the water inlet of the ultrafiltration water tank through the ultrafiltration membrane water outlet pipeline 25 and the ultrafiltration water tank water inlet pipeline 26, and the ultrafiltration membrane booster pump 23 is arranged on the ultrafiltration membrane water inlet pipeline 24.

[0057] Specifically, in this embodiment, the ultrafiltration membrane module transports the effluent from the flotation tank to the ultrafiltration membrane assembly 28 through the ultrafiltration membrane booster pump 23 and the ultrafiltration membrane inlet pipe 24. After the ultrafiltration membrane effectively intercepts the macromolecular organic matter, particle number, turbidity, bacteria and viruses in the water, it is transported to the ultrafiltration water tank through the ultrafiltration membrane outlet pipe 25 and the ultrafiltration water tank inlet pipe 26, or transported to the final outlet pipe 43 of the equipment through the ultrafiltration membrane outlet pipe 25 and the ultrafiltration membrane mixed outlet pipe 27.

[0058] Preferably, the ultrafiltration membrane assembly 28 is a ceramic ultrafiltration membrane assembly 28 with a membrane pore size of 0.05 μm and a membrane area of ​​25 m 2 , membrane flux is 100~200L / (m 2 h), the operation mode is dead-end filtration.

[0059] Specifically, by Figure 2 As shown, the nanofiltration membrane module includes: a nanofiltration membrane booster pump 37, a nanofiltration membrane water inlet pipeline 38, a nanofiltration membrane assembly, a nanofiltration membrane water outlet pipeline 41, a nanofiltration membrane concentrated water pipeline 42, and a final water outlet pipeline 43 of the equipment. The nanofiltration membrane water inlet is connected to the water outlet of the ultrafiltration water tank through the nanofiltration membrane water inlet pipeline 38, the nanofiltration membrane booster pump 37 is arranged on the nanofiltration membrane water inlet pipeline 38, the nanofiltration membrane water outlet pipeline 41 connects the final water outlet pipeline 43 of the equipment and the ultrafiltration membrane mixed water outlet pipeline 27, and the water outlet end of the nanofiltration membrane module is connected to the nanofiltration membrane concentrated water pipeline 42.

[0060] Specifically, in this embodiment, the nanofiltration membrane module transports the untreated water in the ultrafiltration water tank to the nanofiltration membrane assembly through the nanofiltration membrane booster pump 37 and the nanofiltration membrane inlet pipe 38. After the nanofiltration membrane removes the remaining soluble small molecular organic matter and microorganisms in the water, the nanofiltration effluent passing through the nanofiltration membrane is transported to the final outlet pipe 43 of the equipment through the nanofiltration membrane outlet pipe 41, and the nanofiltration concentrate that fails to pass through the nanofiltration membrane will be discharged externally through the nanofiltration membrane concentrate pipe 42.

[0061] Preferably, the nanofiltration membrane module uses two rolled nanofiltration membrane components running in parallel, with a membrane pore size of 1 nm and a single membrane area of ​​37.2 m 2 , membrane flux is 20~40L / (m 2 h), the operation mode is cross-flow filtration.

[0062] Preferably, the final effluent of the equipment is a mixture of effluent from the ultrafiltration membrane module and effluent from the nanofiltration membrane module, with the mixing ratio being between 1:1 and 1:3.

[0063] Further, such as Figure 2 As shown, the water treatment device also includes a cleaning system.

[0064] Specifically, the cleaning system includes a physical cleaning module. The physical cleaning module includes a water backwash pump 29, a water backwash pipeline 30, a backwash pipeline 31, an air backwash pipeline 32, an ultrafiltration membrane lower discharge pipeline 33, an ultrafiltration membrane upper discharge pipeline 34, an air compressor 15 and a compressed air tank 16. The water backwash pump 29 is arranged on the water backwash pipeline 30, and the ultrafiltration water tank 65 is connected to the ultrafiltration membrane assembly 28 through the water backwash pipeline 30 and the backwash pipeline 31. The air compressor and the compressed air tank are connected to the ultrafiltration membrane assembly 28 through the backwash pipeline 31 and the air backwash pipeline 32. The ultrafiltration membrane lower discharge pipeline 33 is connected to the waste outlet below the ultrafiltration membrane assembly 28, and the ultrafiltration membrane upper discharge pipeline 34 is located at the waste outlet above the ultrafiltration membrane assembly 28.

[0065] Specifically, after the ultrafiltration membrane module has been running for 30 to 120 minutes, the ultrafiltration membrane assembly 28 is physically cleaned by a combination of air and water backwashing for 15 to 45 seconds, water backwashing for 15 to 45 seconds, and positive flushing for 15 to 45 seconds. The combined air and water backwashing refers to the delivery of the ultrafiltration filtrate in the ultrafiltration water tank 65 to the backwashing pipeline 31 through the water backwashing pump 29 and the water backwashing pipeline 30. At the same time, compressed air is delivered to the backwashing pipeline 31 through the air compressor, the compressed air tank, and the air backwashing pipeline 32, and then the ultrafiltration membrane assembly 28 is backwashed through the air-water mixture in the backwashing pipeline 31, and the cleaned wastewater is discharged to the outside through the ultrafiltration membrane bottom discharge pipeline 33. The water backwashing means that water in the ultrafiltration water tank is extracted through the water backwashing pump 29, the water backwashing pipeline 30 and the backwashing pipeline 31 to backwash the ultrafiltration membrane assembly 28, and the waste water after cleaning is discharged to the outside through the ultrafiltration membrane lower discharge pipeline 33. The positive flushing means that water from the air flotation tank is extracted through the ultrafiltration membrane booster pump 23 and the ultrafiltration membrane inlet pipeline 24 to positively flush the ultrafiltration membrane assembly 28, and the waste water after cleaning is discharged to the outside through the ultrafiltration membrane upper discharge pipeline 34.

[0066] Preferably, the ultrafiltration membrane module is physically cleaned for 30 to 120 minutes, and the cleaning method is: air-water combined backwashing for 15 to 45 seconds, water backwashing for 15 to 45 seconds, and positive flushing for 15 to 45 seconds. The air washing volume in the air-water combined backwashing is 0.05 to 0.15 N m 3 / (m 2 ·h), the water flow rate of the gas-water combined backwash and forward wash is 50-150L / (m 2 h).

[0067] Further, such as Figure 2As shown, the cleaning system also includes a chemical cleaning module. The chemical cleaning module includes an ultrafiltration membrane circulation pipeline 35, an ultrafiltration membrane chemical cleaning drug feeding pipeline 36, a nanofiltration membrane circulation pipeline 48, a nanofiltration membrane effluent circulation pipeline 46, a nanofiltration membrane concentrated water circulation pipeline 47, a nanofiltration membrane chemical cleaning drug feeding pipeline 49, a nanofiltration membrane assembly discharge pipeline, a chemical cleaning medicine box, a chemical cleaning drug dosing pump, and a chemical cleaning drug dosing pipeline.

[0068] Specifically, the ultrafiltration membrane circulation pipeline 35 is connected to the ultrafiltration membrane water inlet pipeline 24, the ultrafiltration membrane booster pump 23, the ultrafiltration membrane assembly 28 and the ultrafiltration membrane water outlet pipeline 25. The nanofiltration membrane circulation pipeline 48 is connected to the nanofiltration membrane water inlet pipeline 38, the nanofiltration membrane booster pump 37, the nanofiltration membrane assembly, the nanofiltration membrane water outlet circulation pipeline 46 and the nanofiltration membrane concentrated water circulation pipeline 47. The chemical cleaning medicine box connects the ultrafiltration membrane chemical cleaning medicine inlet pipeline 36 and the nanofiltration membrane chemical cleaning medicine inlet pipeline 49 through a chemical cleaning medicine dosing pipe, and the chemical cleaning medicine dosing pump is arranged on the chemical cleaning medicine dosing pipe. The ultrafiltration membrane chemical cleaning medicine inlet pipeline 36 is connected to the ultrafiltration membrane module medicine inlet, and the nanofiltration membrane chemical cleaning medicine inlet pipeline 49 is connected to the nanofiltration membrane module medicine inlet.

[0069] Preferably, when performing the chemical cleaning, the cleaning agent used may be sodium hydroxide, sodium hypochlorite, citric acid, etc. At the same time, according to actual conditions, multiple cleaning agents may be mixed and used in parallel, thereby expanding the selection range of cleaning agents.

[0070] Specifically, after the ultrafiltration membrane module has been running for 1 to 3 days, the ultrafiltration membrane assembly 28 is chemically cleaned once, and the cleaning method can be alkaline cleaning with sodium hydroxide and sodium hypochlorite or acid cleaning with citric acid. The alkaline cleaning with sodium hydroxide and sodium hypochlorite specifically refers to: setting up two chemical cleaning medicine boxes, and configuring sodium hydroxide and sodium hypochlorite reagents in parallel respectively. Sodium hydroxide is extracted to the ultrafiltration membrane water inlet pipe 24 through the sodium hydroxide dosing pump, the sodium hydroxide dosing pipe and the ultrafiltration membrane chemical cleaning drug inlet pipe 36; sodium hypochlorite is extracted to the ultrafiltration membrane water inlet pipe 24 through the sodium hypochlorite dosing pump, the sodium hypochlorite dosing pipe and the ultrafiltration membrane chemical cleaning drug inlet pipe 36, and then the sodium hydroxide and sodium hypochlorite are pressed into the ultrafiltration membrane assembly 28 by the ultrafiltration membrane booster pump 23 for chemical cleaning, and the cleaned wastewater is re-transported to the ultrafiltration membrane water inlet pipe 24 through the ultrafiltration membrane circulation pipe 35 for circulation cleaning, and after the circulation cleaning is completed, the flushing wastewater is discharged to the outside through the ultrafiltration membrane lower discharge pipe 33. The citric acid pickling specifically refers to: the chemical cleaning medicine box is equipped with citric acid reagent. Citric acid is extracted into the ultrafiltration membrane water inlet pipeline 24 through the citric acid dosing pump, the citric acid dosing pipeline and the ultrafiltration membrane chemical cleaning dosing pipeline 36, and then the citric acid is pressed into the ultrafiltration membrane assembly 28 for chemical cleaning through the ultrafiltration membrane booster pump 23. The cleaned wastewater is re-transported to the ultrafiltration membrane water inlet pipeline 24 through the ultrafiltration membrane circulation pipeline 35 for circulation cleaning. After the circulation cleaning is completed, the flushing wastewater is discharged to the outside through the ultrafiltration membrane bottom discharge pipeline 33.

[0071] After the nanofiltration membrane module has been running for 30 to 90 days, the nanofiltration membrane assembly is chemically cleaned once, and the cleaning method is: sodium hydroxide alkaline cleaning or citric acid pickling. The sodium hydroxide alkaline cleaning specifically refers to that the chemical cleaning medicine box is equipped with sodium hydroxide reagent. Sodium hydroxide is extracted into the nanofiltration membrane water inlet pipeline 38 through the sodium hydroxide dosing pump, the sodium hydroxide dosing pipeline and the nanofiltration membrane chemical cleaning medicine inlet pipeline 49, and then the sodium hydroxide is pressed into the nanofiltration membrane assembly through the nanofiltration membrane booster pump 37 for chemical cleaning. The cleaned wastewater is re-delivered to the nanofiltration membrane water inlet pipeline 38 through the nanofiltration membrane circulation pipeline 48, the nanofiltration membrane effluent circulation pipeline 46 and the nanofiltration membrane concentrated water circulation pipeline 47 for circulation cleaning. After the circulation cleaning is completed, the flushing wastewater is discharged to the outside through the nanofiltration membrane assembly discharge pipeline. The citric acid pickling specifically refers to that the chemical cleaning medicine box is equipped with citric acid reagent. Citric acid is extracted into the nanofiltration membrane water inlet pipeline 38 through the citric acid dosing pump, the citric acid dosing pipeline and the nanofiltration membrane chemical cleaning dosing pipeline 49, and then the citric acid is pressed into the nanofiltration membrane assembly for chemical cleaning through the nanofiltration membrane booster pump 37. The cleaned wastewater is re-transported to the nanofiltration membrane water inlet pipeline 38 through the nanofiltration membrane circulation pipeline 48, the nanofiltration membrane effluent circulation pipeline 46 and the nanofiltration membrane concentrated water circulation pipeline 47 for circulation cleaning. After the circulation cleaning is completed, the flushing wastewater is discharged to the outside through the nanofiltration membrane assembly discharge pipeline;

[0072] Preferably, the chemical cleaning cycle of the ultrafiltration membrane module is 1 to 3 days, and the cleaning method is sodium hydroxide and sodium hypochlorite alkali washing or citric acid pickling; the chemical cleaning cycle of the nanofiltration membrane module is 30 to 90 days, and the cleaning method is sodium hydroxide alkali washing or citric acid pickling. Alkaline washing can effectively remove organic pollutants in membrane pollutants, while pickling can effectively remove inorganic salt type pollutants.

[0073] Further, such as Figure 2 As shown, an online monitoring system is also provided on the final water outlet pipeline of the water treatment device. The online monitoring system includes a temperature monitor 59, a pH monitor 60, a turbidity monitor 61, a chromaticity monitor 62, a permanganate index monitor 63, and an ammonia nitrogen monitor 64. Through online monitors such as a temperature monitor, a pH monitor, a turbidity monitor, a chromaticity monitor, a permanganate index monitor 63, and an ammonia nitrogen monitor, it is possible to achieve real-time monitoring of indicators such as temperature, pH value, turbidity, chromaticity, permanganate index, and ammonia nitrogen of the final water outlet of the equipment in the final water outlet pipeline of the equipment.

[0074] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. An integrated water treatment device based on air flotation process coupled with double membrane filtration, characterized in that: The water treatment device comprises: a raw water pipeline, a coagulant dosing system, an air flotation system, a double membrane filtration system, and a final water outlet pipeline of the equipment; The flotation system includes a mechanical flocculation tank, an air flotation tank, a mechanical flocculation tank perforated wall and a dissolved air water module; the double membrane filtration system includes an ultrafiltration membrane module, a nanofiltration membrane module and a filter tank connecting pipeline; The coagulant addition system is arranged on the raw water pipeline at the water inlet end of the device and is connected to the raw water pipeline through a pipeline; the raw water pipeline is connected to the water inlet of the mechanical flocculation tank; the perforated flower wall of the mechanical flocculation tank is arranged between the mechanical flocculation tank and the flotation tank, and the flower wall perforations arranged at the lower part of the perforated flower wall of the mechanical flocculation tank connect the mechanical flocculation tank and the flotation tank; the dissolved air water module is used to dissolve water and air, and inject the dissolved water gas into the flotation tank; the water outlet of the flotation tank is connected to the water inlet of the ultrafiltration membrane module through a pipeline; the water outlet of the ultrafiltration membrane module is connected to the water inlet of the nanofiltration membrane module through the filter tank connecting pipeline; the water outlet of the nanofiltration membrane module is connected to the final water outlet pipeline of the equipment; the final water outlet pipeline of the equipment is controllably connected to the outside world.

2. The integrated water treatment device based on air flotation process coupled with double membrane filtration according to claim 1 is characterized in that: The coagulant dosing system also includes: a coagulant medicine box, a coagulant dosing pump, and a coagulant dosing pipeline; The coagulant medicine box is connected to the raw water pipeline through a coagulant dosing pipeline, and the coagulant dosing pump is arranged on the coagulant dosing pipeline.

3. The integrated water treatment device based on air flotation process coupled with double membrane filtration according to claim 1 is characterized in that: The mechanical flocculation tank also includes: a mechanical agitator; The mechanical agitator is arranged in the mechanical flocculation tank.

4. The integrated water treatment device based on air flotation process coupled with double membrane filtration according to claim 1 is characterized in that: The flotation tank is divided into two areas: an air flotation area and an air flotation outlet area; The flotation tank also includes: a mud scraper, a perforated pipe of the flotation tank, a bottom discharge pipe of the flotation tank, and a mud discharge pipe of the flotation tank; The dissolved air water module also includes: a dissolved air water releaser, a dissolved air pump, an air compressor, a compressed air tank, a dissolved air device, an air inlet pipeline of the dissolved air device, a water inlet pipeline of the dissolved air device and a dissolved air water pipeline of the dissolved air device; The flotation area is connected to the flotation outlet area through the flotation pool perforated pipe; the scraper is arranged above the flotation area, and a flotation mud discharge trough is arranged above the flotation area to receive the sludge scraped out by the scraper; the flotation mud discharge trough is connected to the outside world through the flotation pool mud discharge pipe; the flotation pool lower discharge pipe is arranged below the flotation area and is controllably connected to the outside world; the drain outlet below the flotation outlet area is connected to the air dissolving device through a pipeline; the drain outlet below the flotation outlet area is also connected to the water inlet of the ultrafiltration membrane module through a pipeline; The dissolved air device utilizes the dissolved air pump to extract water from the flotation pool from the bottom drain port of the flotation water outlet area through the dissolved air pump water inlet pipeline; the air compressor is connected to the compressed air tank through a pipeline, and the compressed air tank outlet intakes air to the dissolved air device through the dissolved air device air inlet pipeline; the dissolved air device releases dissolved air water to the flotation pool through the dissolved air water pipeline of the dissolved air device using the dissolved air water releaser, and the dissolved air water releaser is arranged at the bottom of the flotation area.

5. The integrated water treatment device based on air flotation process coupled with double membrane filtration according to claim 1 is characterized in that: The ultrafiltration membrane module also includes: an ultrafiltration membrane booster pump, an ultrafiltration membrane water inlet pipeline, an ultrafiltration membrane assembly, an ultrafiltration membrane water outlet pipeline, an ultrafiltration water tank water inlet pipeline, an ultrafiltration membrane mixed water outlet pipeline and an ultrafiltration water tank; The water inlet of the ultrafiltration membrane assembly is connected to the flotation tank through the ultrafiltration membrane inlet pipeline; the water outlet of the ultrafiltration membrane assembly is connected to the water inlet of the ultrafiltration water tank through the ultrafiltration membrane outlet pipeline and the ultrafiltration water tank inlet pipeline; the ultrafiltration membrane booster pump is arranged on the ultrafiltration membrane inlet pipeline; the ultrafiltration membrane mixing outlet pipeline connects the ultrafiltration membrane outlet pipeline and the final outlet pipeline of the equipment; the ultrafiltration water tank is connected to the water inlet of the nanofiltration membrane module through the filter tank connecting pipeline.

6. The integrated water treatment device based on air flotation process coupled with double membrane filtration according to claim 5 is characterized in that: The ultrafiltration membrane assembly adopts a ceramic ultrafiltration membrane assembly with a membrane pore size of 0.05um and a membrane area of ​​25m 2 , membrane flux is 100~200L / (m 2 h), the operation mode is dead-end filtration.

7. The integrated water treatment device based on air flotation process coupled with double membrane filtration according to claim 5 is characterized in that: The nanofiltration membrane module also includes: a nanofiltration membrane booster pump, a nanofiltration membrane water inlet pipeline, a nanofiltration membrane assembly, a nanofiltration membrane water outlet pipeline, a nanofiltration membrane concentrated water pipeline and a final water outlet pipeline of the equipment; The nanofiltration membrane water inlet is connected to the ultrafiltration water tank outlet through a nanofiltration membrane water inlet pipeline; a nanofiltration membrane booster pump is arranged on the nanofiltration membrane water inlet pipeline; the nanofiltration membrane water outlet pipeline connects the final water outlet pipeline of the equipment and the ultrafiltration membrane mixing water outlet pipeline; the water outlet end of the nanofiltration membrane module is connected to the nanofiltration membrane concentrate pipeline; the nanofiltration membrane concentrate pipeline is controllably connected to the outside world.

8. The integrated water treatment device based on air flotation process coupled with double membrane filtration according to claim 7 is characterized in that: The nanofiltration membrane module uses two rolled nanofiltration membrane components in parallel operation, with a membrane pore size of 1nm and a single membrane area of ​​37.2m 2 , membrane flux is 20~40L / (m 2 h), the operation mode is cross-flow filtration.

9. The integrated water treatment device based on air flotation process coupled with double membrane filtration according to claim 7 is characterized in that: The water treatment device also includes a cleaning system; The cleaning system also includes a physical cleaning module; The physical cleaning module includes a water backwash pump, a water backwash pipeline, a backwash pipeline, an air backwash pipeline, an ultrafiltration membrane lower discharge pipeline, an ultrafiltration membrane upper discharge pipeline, an air compressor and a compressed air tank; The water backwash pump is arranged on the water backwash pipeline, and the ultrafiltration water tank is connected to the ultrafiltration membrane assembly through the water backwash pipeline and the backwash pipeline; the air compressor and the compressed air tank are connected to the ultrafiltration membrane assembly through the backwash pipeline and the air backwash pipeline; the ultrafiltration membrane lower discharge pipeline is connected to the waste discharge port below the ultrafiltration membrane assembly, and the ultrafiltration membrane upper discharge pipeline is located at the waste discharge port above the ultrafiltration membrane assembly.

10. The integrated water treatment device based on air flotation process coupled with double membrane filtration according to claim 9, characterized in that: The cleaning system also includes a chemical cleaning module; The chemical cleaning module includes an ultrafiltration membrane circulation pipeline, an ultrafiltration membrane chemical cleaning drug feeding pipeline, a nanofiltration membrane circulation pipeline, a nanofiltration membrane effluent circulation pipeline, a nanofiltration membrane concentrated water circulation pipeline, a nanofiltration membrane chemical cleaning drug feeding pipeline, a nanofiltration membrane assembly discharge pipeline, a chemical cleaning medicine box, a chemical cleaning drug dosing pump, and a chemical cleaning drug dosing pipeline; The ultrafiltration membrane circulation pipeline is connected to the ultrafiltration membrane water inlet pipeline, the ultrafiltration membrane booster pump, the ultrafiltration membrane assembly and the ultrafiltration membrane water outlet pipeline; the nanofiltration membrane circulation pipeline is connected to the nanofiltration membrane water inlet pipeline, the nanofiltration membrane booster pump, the nanofiltration membrane assembly, the nanofiltration membrane water outlet circulation pipeline and the nanofiltration membrane concentrated water circulation pipeline; The chemical cleaning medicine box is connected to the ultrafiltration membrane chemical cleaning medicine inlet pipeline and the nanofiltration membrane chemical cleaning medicine inlet pipeline through a chemical cleaning medicine dosing pipe; the chemical cleaning medicine dosing pump is arranged on the chemical cleaning medicine dosing pipe; the ultrafiltration membrane chemical cleaning medicine inlet pipeline is connected to the ultrafiltration membrane module medicine inlet port; the nanofiltration membrane chemical cleaning medicine inlet pipeline is connected to the nanofiltration membrane module medicine inlet port.

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