CN101890300B - Integrated ultrafiltration membrane water treatment device integrating membrane fiber detection - Google Patents

Integrated ultrafiltration membrane water treatment device integrating membrane fiber detection Download PDF

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Publication number
CN101890300B
CN101890300B CN 201010241252 CN201010241252A CN101890300B CN 101890300 B CN101890300 B CN 101890300B CN 201010241252 CN201010241252 CN 201010241252 CN 201010241252 A CN201010241252 A CN 201010241252A CN 101890300 B CN101890300 B CN 101890300B
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China
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water
water inlet
communicated
membrane
backwash
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CN 201010241252
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CN101890300A (en
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周永潮
邵卫云
周志军
张土乔
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The invention discloses an integration ultrafiltration membrane water treatment device integrating membrane fiber detection. The device comprises a cartridge filter, more than one ultrafiltration membrane component, a membrane fiber detection air pump, a first electromagnetic valve, transparent pipes, a water inlet manifold and a water outlet manifold, wherein a water outlet end of the cartridge filter is communicated with water inlet ends of the ultrafiltration membrane components through the water inlet manifold; the transparent pipes are fixedly arranged at water outlet ends of the ultrafiltration membrane components and are communicated with the water outlet manifold respectively; the membrane fiber detection air pump is communicated with the water inlet manifold through an air duct; the first electromagnetic valve is arranged on the air duct; the water inlet manifold is provided with a water inlet electromagnetic valve; and the water outlet manifold is provided with a water outlet electromagnetic valve. The device overcomes the defect that a conventional hollow fiber ultrafiltration membrane water treatment device cannot detect the healthy operation of the membrane fiber in time, and on the premise of not influencing the normal operation of the membrane treatment device, not only ensures that the quality of yielding water meets a national drinking water standard but also can conveniently detect whether a hollow fiber membrane fiber in the membrane component operates healthily so as to ensure the security of the yielding water quality.

Description

The integrated ultrafiltration membrane water treatment device that a kind of integrating membrane fiber detects
Technical field
The present invention relates to a kind of integrated ultrafiltration membrane water treatment device, especially relate to the integrated ultrafiltration membrane water treatment device of hollow-fibre membrane silk health detection.
Background technology
Fast development along with China's rural economy, domestic sewage in rural areas by using, industrial wastewater, rubbish, agricultural production and animal waste discharge capacity increase, the surface water and groundwater that river, reservoir, lake, the ditch pool that extensively is distributed in the rural area etc. located is seriously polluted, water source, rural area water quality condition goes from bad to worse, contamination accident happens occasionally, and the healthy of the vast farmers masses in serious threat.
Although traditional feedwater treatment method technical maturity, be widely used, because the water source, rural area is relatively relatively poor, variation water quality is large; the processing water yield is few, adopts the miniature water treatment plant of traditional water treatment technology, and the scale benefit is low; and rural subscribers disperse, and the water supply network investment cost is huge.Traditional handicraft water purification unit is many, complex operation, and operation maintenance management is complicated, and water producing cost is high, and relatively more fragile to the adaptability of water quantity and quality.
Therefore, received great concern at rural potable water field hollow fiber ultrafiltration membrane water treatment facilities.Integrated ultrafiltration membrane water treatment device can be removed the particle in the water effectively, delivery turbidity is reduced to below the 0.1NTU, and can remove large molecular organic pollutants, almost 100% hold back the microorganisms such as two worms, water flea, red worm, algae, bacterium even virus.Simultaneously, ultrafiltration membrane water treatment device water supply scale is flexible, is applicable to the rural dispersed drinking water treatment, and is easy to the later stage reorganization and expansion, only needs to increase and decrease hyperfiltration membrane assembly and gets final product.In addition, the milipore filter device technique is simple, and operation is convenient, need not dosing, can be completely achieved automatic operating, operational management is convenient, the actual techniques managerial skills that meet the rural area, the standardization of film device, modularization and relative intensive so that purification project short construction period, floor space greatly reduces.
But because rural area equipment intermittent duty, the personal management level is low, and maintenance is not in place, and when inside and outside differential pressure suddenlyd change, the problem of film silk fracture easily occured hollow fiber film assembly.The fracture of film silk is the main cause that milipore filter lost efficacy.In case the fracture of film silk, the giardia lamblia in the water of source and Cryptosporidium, water flea, red worm etc. directly enter filtered water tank by the film silk place of fracture, if can not in time find, will have a strong impact on the healthy of user.And hollow fiber ultrafiltration membrane water treatment device does not possess film silk health diagnosis function at present, and the film of remote districts, rural area processing purifier often lacks expert engineer's regular management and the regular water quality detection of health supervision department, the fracture of film silk, disrepair phenomenon are difficult in time be found, so that doughnut film water treatment equipment effluent quality can't guarantee, security risk increases.
Summary of the invention
The purpose of this invention is to provide the integrated ultrafiltration membrane water treatment device that a kind of integrating membrane fiber detects.
For achieving the above object, the technical solution used in the present invention is: the integrated ultrafiltration membrane water treatment device that this integrating membrane fiber detects comprises that cartridge filter, more than one hyperfiltration membrane assembly, film silk detect air pump, the first magnetic valve, transparent pipe, water inlet manifold and outfall sewer, the water side of described cartridge filter is communicated with by water inlet manifold with the water inlet end of each hyperfiltration membrane assembly, the water side of each hyperfiltration membrane assembly is installed with respectively transparent pipe, each transparent pipe is communicated with outfall sewer respectively, and described film silk detects air pump and is communicated with described water inlet manifold by wireway; Described the first magnetic valve is installed on the described wireway; Entering water electromagnetic valve is installed on the water inlet manifold, water solenoid valve is installed out on the outfall sewer.
Further, the water inlet end of each hyperfiltration membrane assembly of the present invention is communicated with described water inlet manifold by corresponding the first sparge pipe respectively, and each transparent pipe is communicated with outfall sewer by corresponding the second sparge pipe respectively.
Further, the present invention also comprises Chemical cleaning chlorination equipment and sterilization cleaning drain solenoid valve; Described Chemical cleaning chlorination equipment comprises Chemical cleaning water tank, chemical disinfection water tank and Chemical cleaning disinfectant pump, in the intersection of each the second sparge pipe with go out between the water solenoid valve, outfall sewer is communicated with respectively with Chemical cleaning water tank and chemical disinfection water tank by the bypass outlet pipe, Chemical cleaning water tank and chemical disinfection water tank are communicated with the water inlet end of Chemical cleaning disinfectant pump, the water side of Chemical cleaning disinfectant pump is communicated with water inlet manifold, and the junction of Chemical cleaning disinfectant pump and water inlet manifold is between the intersection and entering water electromagnetic valve of each the first sparge pipe.
Further, the present invention also comprises back purge system, described back purge system comprises backwash water tank and backwash pump, described backwash water tank is communicated with outfall sewer, the water inlet of described backwash pump is communicated with the delivery port of backwash water tank, the delivery port of backwash pump is connected with outfall sewer by the backwash water pipe, and the junction of backwash water pipe and outfall sewer is in the intersection of each the second sparge pipe and go out between the water solenoid valve.
The invention has the beneficial effects as follows: the integrated ultrafiltration membrane water treatment device that this integrating membrane fiber detects changes flow and the lift of automatically regulating former water variable frequency pump according to the pressure of discharge pressure sensor, does not establish regulating tank, has avoided secondary pollution.Simultaneously, overcome the defective that existing hollow fiber ultrafiltration membrane water treatment device can't in time detect the healthy operation of film silk, added hollow-fibre membrane silk measuring ability in the water treatment facilities of the present invention, detect air pump and wireway by integrating membrane fiber in handling process, and in each hyperfiltration membrane assembly water side transparent pipe is installed, the generation of range estimation bubble is to reach the film silk health status that detects each hyperfiltration membrane assembly, after detection is complete, the PLC switch board is opened relevant control automatically successively, implement device rushes soon the backwash function and finishes exhaust and backwash, the integrated ultrafiltration membrane water treatment device of integrated this measuring ability not only can make the water outlet water quality safety healthy, reach national drinking water standard (GB5749-2006), simultaneously can be under the prerequisite that does not affect the normal operation of device, whether health is moved to measure easily the interior hollow-fibre membrane silk of hyperfiltration membrane assembly, avoid former water directly to penetrate, pollute effluent quality, guarantee effluent quality safety.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the work schematic diagram for the treatment of apparatus of the present invention;
Fig. 2 is the operation principle schematic diagram that treating apparatus film silk of the present invention detects.
Among the figure: 1. former water water inlet pipe, 2. former water variable frequency pump, 3. the first check-valves, 4. raw water flow meter, 5. inlet pressure sensor, 6. cartridge filter, 7. outlet pressure sensor, 8. entering water electromagnetic valve, 9. hyperfiltration membrane assembly, 10. backwash outlet pipe, 11. backwash magnetic valve, 12. outfall sewer, 13. drain solenoid valve is cleaned in sterilization, 14. go out water solenoid valve, 15. discharge pressure sensor, 16. backwash water tank water inlet pipe, 17. Chemical cleaning water tank, 18. chemical disinfection water tank, 19. Chemical cleaning disinfectant pump, 20. the film silk detects air pump, 21. the first magnetic valve, 22. transparent pipe, 23. backwash flowmeter, 24. backwash pump, 25. backwash water tank, 26.PLC switch board, 27. control line, 28. the second check-valves, 29. ball-cock assembly, 30. wireway, 31. fluid level controller, 32. backwash water pipe, 33. hollow-fibre membrane silk, 34. bypass outlet pipe, 35. water inlet manifold, 36. the first sparge pipe, 37. the second sparge pipe.
The specific embodiment
Be described in further detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the integrated ultrafiltration membrane water treatment device of integrating membrane fiber detection of the present invention comprises that cartridge filter 6, four hyperfiltration membrane assemblies 9, film silks detect air pump 20, the first magnetic valve 21, transparent pipe 22, water inlet manifold 35 and outfall sewers 12.Wherein, the water side of cartridge filter 6 is communicated with by water inlet manifold 35 with the water inlet end of each hyperfiltration membrane assembly 9, the water side of four hyperfiltration membrane assemblies 9 respectively is installed with a transparent pipe 22, each transparent pipe 22 is communicated with outfall sewer 12 respectively, and the film silk detects air pump 20 and is communicated with water inlet manifold 35 by wireway 30; The first magnetic valve 21 is installed on the wireway 30.Entering water electromagnetic valve 8 is installed on the water inlet manifold 35, water solenoid valve 14 is installed out on the outfall sewer 12.
The film silk detects air pump 20 optional DA5001/6 small silent oilless air compressors with Lip river, Mount Tai, Shanghai industry and trade Co., Ltd.
Can adopt the cotton melt-blown filter of PP of Hangzhou Yongjieda Cleaning Technology Co.,Ltd in the cartridge filter 6, be used for holding back the larger suspended particulate of former water particle diameter.During use, connect former water water inlet pipe 1 in the water inlet of cartridge filter 6.If on the water inlet manifold 35 of the former water water inlet pipe l of the water inlet of cartridge filter 6 and water outlet inlet pressure sensor 5 and outlet pressure sensor 7 are installed respectively, then the melt-blown filters in the cartridge filter 6 can be changed according to the pressure differential size of entery and delivery port pressure sensor in good time.Suggestion is when pressure reduction during greater than 0.05Mpa, replacing melt-blown filter.
Hyperfiltration membrane assembly 9 is used for the tiny suspended particulate of further trap water, and molecular cut off can reach 100000 dalton, makes water outlet reach national drinking water standard (GB5749-2006).Fig. 1 shows four hyperfiltration membrane assemblies 9, and the quantity of hyperfiltration membrane assembly is at least one among the present invention, specifically can determine according to the aquifer yield size, and general, the quantity of hyperfiltration membrane assembly increases with the increase of aquifer yield.Particularly, first sparge pipe 36 of the water inlet end of each hyperfiltration membrane assembly 9 by separately is communicated with water inlet manifold 35, and the transparent pipe 22 that is installed together with the water side of each hyperfiltration membrane assembly 9 respectively the second sparge pipe 37 by separately is communicated with outfall sewer 12.In the present invention, hyperfiltration membrane assembly 9 can adopt the LH3-1060-V type hyperfiltration membrane assembly of Hainan liter Pure Water Scientific And Technical Industry Co., Ltd.
As shown in Figure 1, as one embodiment of the present invention, the integrated ultrafiltration membrane water treatment device that integrating membrane fiber of the present invention detects also comprises the Chemical cleaning chlorination equipment.As shown in Figure 1, the Chemical cleaning chlorination equipment is comprised of Chemical cleaning water tank 17, chemical disinfection water tank 18 and Chemical cleaning disinfectant pump 19, and wherein, the Chemical cleaning disinfect box comprises Chemical cleaning water tank 17 and chemical disinfection water tank 18.In the intersection of each the second sparge pipe 37 with go out between the water solenoid valve 14, outfall sewer 12 connects a bypass outlet pipe 34, Chemical cleaning water tank 17 and chemical disinfection water tank 18 are communicated with bypass outlet pipe 34 respectively, and Chemical cleaning water tank 17 and chemical disinfection water tank 18 are communicated with the water inlet end of Chemical cleaning disinfectant pump 19 respectively, the water side of Chemical cleaning disinfectant pump 19 is communicated with water inlet manifold 35, and the junction of Chemical cleaning disinfectant pump 19 and water inlet manifold 35 is between the intersection and entering water electromagnetic valve 8 of each the first sparge pipe 36.In the junction of bypass outlet pipe 34 and outfall sewer 12 with go out between the water solenoid valve 14, sterilization also being installed on the outfall sewer 12 cleaning drain solenoid valve 13.
When carrying out the Chemical cleaning sterilization, in Chemical cleaning water tank 17 and chemical disinfection water tank 18, add respectively the cleaning and sterilizing medicament, suggestion cleaning agent and disinfectant are respectively NaOH and NaClO.Enter Chemical cleaning water tank 17 and chemical disinfection water tank 18 through the water after the milipore filter water treatment by bypass outlet pipe 34, close out water solenoid valve 14, open sterilization and clean drain solenoid valve 13, open Chemical cleaning disinfectant pump 19, the Chemical cleaning thimerosal enters respectively each hyperfiltration membrane assembly 9 by water inlet manifold 35 and the first sparge pipe 36, hollow-fibre membrane in the hyperfiltration membrane assembly 9 is carried out cleaning and sterilizing, and after sterilization was finished, Chemical cleaning disinfectant pump 19 and sterilization were cleaned drain solenoid valve 13 and are closed.
As shown in Figure 1, as one embodiment of the present invention, the integrated ultrafiltration membrane water treatment device that integrating membrane fiber of the present invention detects also can comprise back purge system, back purge system is comprised of backwash water tank 25 and backwash pump 24, wherein, backwash water tank 25 is communicated with outfall sewer 12, the water inlet of backwash pump 24 is communicated with the delivery port of backwash water tank 25, the delivery port of backwash pump 24 is connected with outfall sewer 12 by backwash water pipe 32, and the junction of backwash water pipe 32 and outfall sewer 12 is in the intersection of each the second sparge pipe 37 and go out between the water solenoid valve 14.
As shown in Figure 1, be connected with backwash water tank water inlet pipe 16 on the outfall sewer 12, and go out water solenoid valve 14 between the intersection of the junction of outfall sewer 12 and backwash water tank water inlet pipe 16 and each the second sparge pipe 37.25 in backwash water tank is communicated with outfall sewer 12 by backwash water tank water inlet pipe 16, makes the water purification after the processing enter backwash water tank 25 by backwash water tank water inlet pipe 16.Ball-cock assembly 29 is installed in the exit of backwash water tank water inlet pipe 16, fluid level controller 31 is installed in the backwash water tank, after water level drops to certain value, backwash pump 24 is closed, the idle running of backwash pump 24 when avoiding backwash water tank 25 anhydrous, the delivery port of backwash pump 24 is connected with outfall sewer 12 by backwash water pipe 32, the junction of backwash water pipe 32 and outfall sewer 12 is in the intersection of the second sparge pipe 37 and go out between the water solenoid valve 14, and backwash flowmeter 23 and the second check-valves 28 are installed on the backwash water pipe 32.In addition, the backwash water side of each hyperfiltration membrane assembly 9 can be connected with backwash outlet pipe 10, and backwash magnetic valve 11 is installed on the backwash outlet pipe 10.When one section all after date of system works, PLC switch board 26 control entering water electromagnetic valves 8, go out water solenoid valve 14 and close, backwash magnetic valve 11, backwash pump 24 are opened, water purification in the backwash water tank 25 is reversed by outfall sewer 12 and the second sparge pipe 37 and is pressed into hyperfiltration membrane assembly 9, the anti-hollow fiber ultrafiltration membrane that sees through in the hyperfiltration membrane assembly 9, the polluter that the film surface is held back has rushed and has discharged by backwash outlet pipe 10 with current.
As shown in Figure 1, during ultrafiltration membrane water treatment device work of the present invention, former water water inlet pipe 1 is communicated with the port of export of former water variable frequency pump 2, and the first check-valves 3, raw water flow meter 4 and inlet pressure sensor 5 are installed on the former water water inlet pipe 1, at water inlet manifold 35 entering water electromagnetic valve 8 is installed.When the present invention works, the first magnetic valve 21, backwash magnetic valve 11 cuts out, entering water electromagnetic valve 8 and go out water solenoid valve 14 and open, former water passes through former water water inlet pipe 1 access to plant after former water variable frequency pump 2 promotes, after cartridge filter 6 and hyperfiltration membrane assembly 9 two stages for the treatment of, enter outfall sewer 12 through the second sparge pipe 37 and deliver to the user, discharge pressure sensor 15 is installed on the outfall sewer 12, and link to each other with PLC switch board 26 with control line 27, pressure by pressure sensor 15 changes, control the rotating speed of former water variable frequency pump 2, make water outlet not only satisfy the setting pressure scope but also reach energy-conservation purpose.When carrying out the detection of film silk, as shown in Figure 2, the film silk detects air pump 20, the first magnetic valve 21 is opened, gas enters hyperfiltration membrane assembly 9 by water inlet manifold 35, if the hollow-fibre membrane silk 33 in the hyperfiltration membrane assembly 9 is working properly, then keep certain gas, water pressure balance in hollow-fibre membrane silk 33, gas can't see through film and enter the second sparge pipe 37, and transparent pipe 22 does not just have Bubble formation; If there are the problems such as fracture, breakage in the film silk, gas is extruded the water in the hyperfiltration membrane assembly 9 from breakage under pressure, after hyperfiltration membrane assembly 9 interior liquid levels are down to film silk damage location, gas just enters the second sparge pipe 37, bubble to occur in the transparent pipe 22, illustrate that hollow-fibre membrane silk 33 exists damaged or fracture this moment.After detection is finished, close out water solenoid valve 14 and the second magnetic valve 21, backwash magnetic valve 11 is opened, and enters positive rinse stage, gets rid of air and dense water in the hyperfiltration membrane assembly 9.The film silk detects the pressure of air pump 20 should be less than the hollow-fibre membrane bubble point pressure, and because hollow-fibre membrane silk 33 bubble point pressures are about 0.2-0.3MPa, is preferably 0.08-0.1MPa so the film silk detects the air pressure setting of air pump 20.
To sum up, ultrafiltration membrane water treatment device of the present invention is in the work period time, former water is behind former water variable frequency pump 2 ramming systems, at first pass through the coagulation of cartridge filter 6, filter out macroscopic fine particle, former water behind coagulation enters hyperfiltration membrane assembly 9 and carries out two stage treatment, with fine particle in the further removal water, makes effluent quality reach national drinking water standard (GB5749-2006).After the work period finished, entering water electromagnetic valve 8 was closed, and backwashing system is opened, and system enters backwashing procedures, after backwash finishes, continued to enter the work period.After operation a period of time, open the Chemical cleaning chlorination equipment, to cleanings that carry out disinfection of film silk surface, the microorganism that multiply on removing film silk surface.When needs carry out the detection of film silk, film silk detection system is opened, air is pressed into inlet channel, gas enters each root hyperfiltration membrane assembly in the water treatment facilities with current, owing to pumping into air pressure less than the hollow-fibre membrane bubble point pressure, under film silk prerequisite working properly, gas can not see through milipore filter, and see-through section be can't see bubble; If film silk fracture, breakage, then air can see through milipore filter and enter outlet conduit, and bubble namely appears in see-through section, is able to distinguish whether healthy purpose of film silk.Detect complete after, control system controlling diaphragm treatment facility enters positive cleaning procedure, emptying membrane module Air.

Claims (4)

1. the integrated ultrafiltration membrane water treatment device that detects of an integrating membrane fiber, it is characterized in that: comprise cartridge filter (6), more than one hyperfiltration membrane assembly (9), the film silk detects air pump (20), the first magnetic valve (21), transparent pipe (22), water inlet manifold (35) and outfall sewer (12), the water side of described cartridge filter (6) is communicated with by water inlet manifold (35) with the water inlet end of each hyperfiltration membrane assembly (9), the water side of each hyperfiltration membrane assembly (9) is installed with respectively transparent pipe (22), each transparent pipe (22) is communicated with outfall sewer (12) respectively, and described film silk detects air pump (20) and is communicated with described water inlet manifold (35) by wireway (30); Described the first magnetic valve (21) is installed on the described wireway (30); Entering water electromagnetic valve (8) is installed on the water inlet manifold (35), water solenoid valve (14) is installed out on the outfall sewer (12).
2. the integrated ultrafiltration membrane water treatment device that detects of a kind of integrating membrane fiber according to claim 1, it is characterized in that: the water inlet end of described each hyperfiltration membrane assembly (9) is communicated with described water inlet manifold (35) by corresponding the first sparge pipe (36) respectively, and each transparent pipe (22) is communicated with outfall sewer (12) by corresponding the second sparge pipe (37) respectively.
3. the integrated ultrafiltration membrane water treatment device of a kind of integrating membrane fiber detection according to claim 2 is characterized in that: also comprise Chemical cleaning chlorination equipment and sterilization cleaning drain solenoid valve (13); Described Chemical cleaning chlorination equipment comprises Chemical cleaning water tank (17), chemical disinfection water tank (18) and Chemical cleaning disinfectant pump (19), in the intersection of each the second sparge pipe (37) with go out between the water solenoid valve (14), outfall sewer (12) is communicated with respectively with Chemical cleaning water tank (17) and chemical disinfection water tank (18) by bypass outlet pipe (34), Chemical cleaning water tank (17) and chemical disinfection water tank (18) are communicated with the water inlet end of Chemical cleaning disinfectant pump (19), the water side of Chemical cleaning disinfectant pump (19) is communicated with water inlet manifold (35), and the junction of Chemical cleaning disinfectant pump (19) and water inlet manifold (35) is positioned between the intersection and entering water electromagnetic valve (8) of each first sparge pipe (36).
4. according to claim 2 or the integrated ultrafiltration membrane water treatment device that detects of 3 described a kind of integrating membrane fibers, it is characterized in that: also comprise back purge system, described back purge system comprises backwash water tank (25) and backwash pump (24), described backwash water tank (25) is communicated with outfall sewer (12), the water inlet of described backwash pump (24) is communicated with the delivery port of backwash water tank (25), the delivery port of backwash pump (24) is connected with outfall sewer (12) by backwash water pipe (32), and the junction of backwash water pipe (32) and outfall sewer (12) is positioned at the intersection of each second sparge pipe (37) and goes out between the water solenoid valve (14).
CN 201010241252 2010-07-30 2010-07-30 Integrated ultrafiltration membrane water treatment device integrating membrane fiber detection Expired - Fee Related CN101890300B (en)

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CN103611423B (en) * 2013-12-11 2015-08-19 株洲时代新材料科技股份有限公司 A kind of water flux of hollow-fibre membrane and rejection testing arrangement
CN105561791A (en) * 2014-11-07 2016-05-11 百富环保科技有限公司 Ultrafiltration membrane filter cartridge, ultrafiltration membrane filter device and ultrafiltration membrane filter system
CN105013330B (en) * 2015-08-04 2018-06-12 天津华清健坤膜科技有限公司 A kind of film properties test platform and application method with double test functions
CN105198106A (en) * 2015-09-23 2015-12-30 江苏省科建成套设备有限公司 Integrated equipment for recycling technological drainage of tap water plant
CN106000109A (en) * 2016-08-10 2016-10-12 中国人民大学 Hollow fiber ultramicro-filtration membrane assembly and membrane performance detection device
CN106823820B (en) * 2017-03-03 2021-02-02 同济大学 Integrated device for obtaining metal film operation and cleaning working condition parameters
CN110980884A (en) * 2019-12-24 2020-04-10 天津膜天膜科技股份有限公司 Unsteady-state membrane operation process for treating high-concentration wastewater

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