CN102658031A - External filtering system for hollow fiber porous membrane bundle and technology thereof - Google Patents
External filtering system for hollow fiber porous membrane bundle and technology thereof Download PDFInfo
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- CN102658031A CN102658031A CN2012101283047A CN201210128304A CN102658031A CN 102658031 A CN102658031 A CN 102658031A CN 2012101283047 A CN2012101283047 A CN 2012101283047A CN 201210128304 A CN201210128304 A CN 201210128304A CN 102658031 A CN102658031 A CN 102658031A
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Abstract
The invention relates to a water processing system and a method of water processing. An external filtering system for a hollow fiber porous membrane bundle comprises a casing, an air inlet, a water inlet and a drain outlet are arranged on the casing, and a frame body and a hollow U-shaped membrane wire are arranged in the casing. The water processing technology corresponding to the water processing system comprises a water producing process and a gas-liquid two-phase washing process. The membrane wire of the external filtering system is not apt to break, and a membrane assembly is long in service life, wash-resisting and good in antifouling effect. The external filtering system and the technology solve the problems that in the prior art, two ends of the membrane wire are fixed, the membrane wire is not apt to shade or vibrate so that vibration washing effect cannot be achieved, stress is not very even, breaking can be generated easily, pollutants are apt to deposit on the root portion of the membrane wire, accordingly service life of the membrane assembly is effected, water quality is not stable, the membrane wire of the water processing system is apt to be blocked, and water processing effect can be influenced.
Description
Technical field
The present invention relates to the method for a kind of water treatment system and water treatment, relate in particular to a kind of filtration system and technology of external hollow-fibre membrane porous membrane bundle.
Background technology
Sewage and waste water reuse treatment process flow process more complicated such as traditional life, industry, operational administrative is also pretty troublesome, and its processing water water quality is very unstable.The embrane method treatment technology that grew up has in recent years overcome the shortcoming and defect of traditional handicraft, and the water quality physical and chemical index after the processing is improved.In traditional membrane module designs; Be the hollow-fibre membrane silk to be loaded in tubular shell, form membrane module; The doughnut perforated membrane is widely used in the filtration, purification of filtration, purified treatment, the especially water of various solution because of its comparatively rational structure and ripe technology.In recent years owing to use doughnut perforated membrane Direct Filtration ultra's needs, a kind of assembly that doughnut perforated membrane that former pond or biochemistry pool filter constitutes that directly is immersed in has appearred, be referred to as immersion doughnut perforated membrane assembly.Its principal mode is generally curtain formula structure, promptly be a certain amount of hollow fiber bundle is curtain formula state, its two ends respectively with a straight tube (collector pipe) on the slotted hole overall fixed opened, every doughnut endoporus communicates with collector pipe.During work with collector pipe up and down level or about vertically place, make hollow fiber bundle be horizontal or vertical curtain formula state.The two ends collector pipe links to each other with pump intake; Make the hollow-fibre membrane internal bore pressures be lower than its film outer surface pressure; Water to be filtered in the container sees through micropore permeation to the film endoporus on hollow-fibre membrane surface under the effect of film pressure at both sides difference, be inhaled into collector pipe and pass through the water pump discharge.In order to improve treatment effect, often rely on and improve the membrane area that film silk filling density increases the assembly unit volume, still can influence the even distribution of current in the assembly like this, can cause the big loss of flood peak.And be not under the situation as major consideration at volume, the big and little assembly of film silk packed density of volume, its osmotic effect can be better; Simultaneously, film silk density is more little in the assembly, and the loss of flood peak of assembly also can be more little; Current are even in the assembly, and the utilization of membrane area is just abundant more.But in traditional assembly, reduce film silk density, not only do not have the flow uniformity of improving of expection, the film silk is easy to fracture and produces the current short circuit.Can reduce the uniformity and the gas-liquid transmission efficiency of current so on the contrary, cause the film silk dirty stifled easily.In order to improve flow uniformity, improve infiltration efficient, solve the stifled problem of dirt of used film simultaneously, various no shell membrane assemblies arise at the historic moment.
Like Chinese patent: CN200420109650.1 filter plant, especially relate to a kind of structural improvement that is immersed in the doughnut perforated membrane assembly in the non-pressure vessel.Immersion canal formula gas distribution hollow fiber film assembly; Be fixed in up and down the hollow-fibre membrane in two fixed bodies by at least one end socket joint; The collecting chamber that communicates with the endoporus of hollow-fibre membrane, end cap and gas distribution system constitute, and the air inlet stay pipe of described gas distribution system is arranged at the center of fixed body, and air inlet stay pipe and fixed body are fixed the hollow-fibre membrane two ends; And form an integral body, radially be provided with the opening of some gas distribution channels in the side of an end of air inlet stay pipe sealing.
Also have Chinese patent: CN201110005290.5 to disclose a kind of film silk structure and membrane bioreactor that is used for membrane bioreactor.Wherein, this film silk structure is a helix tube, and said helix tube is spiral helicine hollow-fibre membrane.The present invention utilizes the centrifugal action of current to form Secondary Flow Dean whirlpool by means of helical form film silk structure, has improved the mass-transfer performance of current in the film silk, current has been produced biomembrane wash away the self-cleaning function.
Summary of the invention
The invention provides not easy fracture of a kind of film silk, the membrane module long service life is produced water quality stabilizing, and anti-cleaning is antifouling stifled effective, the filtration system and the technology thereof of external doughnut porous membrane bundle simple in structure; Solved the film silk two ends that exist in the prior art and fixed, the film silk is difficult for swing or vibration, is unfavorable for performance vibration cleaning performance, and is stressed very uneven, is easy to generate the technical problem of fracture.
The present invention provides a kind of film silk effectively to be supported simultaneously, can be with film silk beam splitting management, and fracture of wire that can fast detecting film silk damages phenomenon, effectively prevents the filtration system and the technology thereof of the external doughnut porous membrane bundle that the film silk intertwines; The film silk that has solved the water treatment system that exists in the prior art is tied a knot easily, and inconvenience is arranged in the classification of film silk; Also solved in the prior art and to have immersed the film system to clean the gas-liquid two-phase flow configuration very unreasonable; In film silk root contaminant deposition very easily; Thereby influence the service life of membrane module; Cause the film silk that produces water water quality instability, water treatment system dirty easily stifled, thereby influence the technical problem of the effect of water treatment.
Above-mentioned technical problem of the present invention solves through following technical proposals: a kind of filtration system of external doughnut porous membrane bundle is characterized in that: comprise cylindrical shell, be respectively equipped with upper cover and low head at the two ends up and down of cylindrical shell; Be provided with central tube in the housing that upper and lower end socket and cylindrical shell constitute, offer water distributing pore on the outer wall of central tube, an end of central tube is connected with water inlet; The other end sealing of central tube; Be provided with water inlet and produce the mouth of a river at an end of housing, be provided with air inlet, sewage draining exit and distribution device, between upper and lower end socket, be provided with the U-shaped hollow-fibre membrane at the other end of housing; The upper end cast of U-shaped hollow-fibre membrane; U-shaped hollow-fibre membrane open upper end is positioned at upper cover, and water distributing pore is positioned at the below of the cast end of U-shaped hollow-fibre membrane, on central tube, is connected with support body.Water inlet with produce that the mouth of a river is parallel to be opened on the upper cover, air inlet and sewage draining exit are on low head, sewage draining exit is positioned at the side of low head.Membrane component of the present invention adopts the U-shaped setting, the single face cast, and end face is down, can avoid pollutant at end face, promptly film silk root deposits.Purge flow is parallel to the film silk from bottom to top in the bottom, from the cleaning fluid of central tube the film silk is formed the side direction purge flow, forms reciprocation thus and cleans gas-liquid two-phase flow; Gas-liquid is washed and is connected liquid band gas and advance together, and liquid advances from sewage draining exit, and gas is to advance from air inlet; Wash away and the vibrating membrane silk, the film silk root area until the top is because of be the end of gas-liquid flow; Can not form thump, to avoid fracture of wire film silk root.Therefore structural design of the present invention both can effectively have been avoided the pollution problem in pollution deposit zone the most easily, also can produce effective cleaning performance.Simultaneously on central tube, connect support body, can support, can the film silk of sheet be divided into one group one group film bundle simultaneously, made things convenient for the layout of film silk like this U-shaped hollow-fibre membrane.On the other hand,, arranges the doughnut porous membrane bundle that the fiber distance in its margin and center zone is less, thereby in layout and operation process, the stressed cardinal principle of each root doughnut therebetween is identical, not easy fracture because being pencil.
Water inlet is intake when former water treatment, when the gas-liquid two-phase is washed, serves as the gas-liquid floss hole.Sewage draining exit is the cross-flow mouth when former water treatment, after producing the water collection, the sewage that remains in the housing is drained.
Membrane module of the present invention system; Said hollow-fibre membrane can adopt present known commercial supermicro filtration membrane material; Comprising the polyvinyl alcohol of cellulose and derivative thereof, Merlon, polyvinyl chloride, Kynoar, polysulfones, polyacrylonitrile, polyamide, polysulfonamides, SPSF, interlinkage, modified acrylic polymer etc., average membrane pore size≤0.1 μ m.
As a kind of preferred, described inlet duct comprises the air-spreading disk that is positioned at U-shaped hollow-fibre membrane below, offers qi-emitting hole on the air-spreading disk, is connected with air inlet at an end of air-spreading disk, and air inlet is opened on the low head.Air-spreading disk is the center with the central tube, be positioned at the film bundle under, convenient to film Shu Jinhang airflow scouring, reduce dirty stifled possibility, the stability of raising equipment running.
Preferred as another kind, described inlet duct comprises the air inlet that is arranged on the low head, and air inlet is connected with admission line; Admission line is connected with the outer support body of central tube; On support body, offer pore, on admission line, be connected with air-spreading disk simultaneously, offer qi-emitting hole on the air-spreading disk.As choosing is more arranged; Described support body comprises the multilayer support that is parallel to each other; Described support comprises center fixing part and brace rod, and center fixing part is fixed on the central tube, on center fixing part, is connected with the tubular support muscle of hollow; Admission line in center fixing part, is furnished with pore on the described brace rod through the cross-under of air inlet by-path.The admission line of inlet duct is connected on the support body; Utilize the extension of support body as inlet duct; Utilize the pore of offering on the brace rod to blow at residing each platform of support body and realize, prevent that the film silk is dirty stifled, the service life of improving system the multilayer cleaning of film bundle and the shake of film silk.Improved air-spreading disk suffered restriction below the film bundle time.Because when the gas-liquid two-phase was washed, the resistance that gas receives current was bigger, generally can only reach about 1/3 height of film silk, so the film silk on housing top to receive the impact of air-flow little, a little less than the shake.And the present invention is equipped with pore at each layer of film bundle; So just can carry out purge, make that the film silk of root is cleaner, simultaneously the film silk on top; So layout of multilayer air-flow; Being entangled with of minimizing film silk that also can be few as far as possible, and the radius of a circle of the distribution of pore is also bigger, can all well clear up the outer field film silk of internal layer.Admission line is connected on the support body through the flexible pipe of air inlet, and air induction hose can reduce the damage to the film silk, can not hinder the shake of film silk, improves the antifouling stifled performance of film silk.
As preferably; Described support body comprises the multilayer support that is parallel to each other; Described support comprises center fixing part and brace rod, and center fixing part is fixed on the central tube, on center fixing part, is connected with brace rod; Brace rod is that the center is radial and is uniformly distributed with the center fixing part, and brace rod is divided into some bundles with the U-shaped hollow-fibre membrane.Which floor axial arranged along central tube brace rod has been divided into; The multilayer fixed constraint; Can the U-shaped hollow-fibre membrane better be divided into groups to realize management; Simultaneously also be the hunting range of appropriateness control U-shaped hollow fiber membrane bundle, prevent that perhaps every intrafascicular hollow fiber perforated membrane inner part generation is curled up each other between the how empty film bundle of doughnut.When needing, also can be at the loose ring of every bundle U-shaped hollow fiber membrane bundle external, with the excessive swing of appropriateness restriction hollow fiber membrane unit.
As preferably, described air-spreading disk be positioned at housing under; In the form of annular discs or the rib strip shaped of air-spreading disk, the qi-emitting hole zone and the gas distribution bar that offer interlaced arrangement on the discoid air-spreading disk are regional; The air-spreading disk of rib strip shaped comprises the central part that overlaps with the central tube center, and the one-body molded rib that a plurality of symmetric arrangement are arranged offers qi-emitting hole on rib on central part.Circular air-spreading disk, cloth tolerance foot can help film silk shake blowdown effectively to film Shu Jinhang air-blowing.The air-spreading disk of rib strip shaped is simple in structure, and rib is that the center radially distributes with the central part, and the gas distribution direction is variation more, improves the gas distribution effect.
As preferably; Described central tube is positioned at the center of housing; Central tube is provided with the length of part of water distributing pore smaller or equal to the length of U-shaped hollow-fibre membrane; The casting area of described U-shaped hollow-fibre membrane upper end is positioned at upper cover and cylindrical shell intersection, and the length of described U-shaped hollow-fibre membrane is 90% ~ 95% of cylindrical shell length.It is intrafascicular that water distributing pore is positioned at film, makes things convenient for current to see through hollow-fibre membrane and handle, and puies forward the high yield water quality.The length of U-shaped hollow-fibre membrane is so that the film silk can effectively be shaken, and the convenient pollutant that will stick to film silk surface washes away.
As preferably, described water producing pipe is provided with peephole.Whether monitor film silk fracture of wire phenomenon, improve operation stability of equipment, guarantee to produce the quality stability of water simultaneously.
As preferably, be connected with circulating line at described sewage draining exit, on circulating line, be connected with circulating pump, the other end of circulating line is connected with water inlet.Dense water circulating filter improves filter effect and efficient.
As preferably, be connected with the water producing pipe road at the described product mouth of a river, on the water producing pipe road, be connected with the product water pump.Convenient output of producing water.
The filtering technique of a kind of external doughnut porous membrane bundle of corresponding said system is characterized in that: the first step, pending former water was sent in the housing second step by the water inlet pressurization of central tube; Pending former water is flowed out by the water distributing pore on the central tube outer wall and is distributed in the gap of U-shaped hollow-fibre membrane, and in the 3rd step, the water of purification sees through the micropore that is clouded on the hollow membranous wall and gets into film silk inner chamber, the 4th step; The place is communicated with water producing pipe at the product mouth of a river, and the water with the purification in the U-shaped hollow-fibre membrane under the intake pressure effect is collected in collecting chamber through the opening on the film silk, and assembly is left at the multiparity mouth of a river again, the 5th step; After collecting product water, close water inlet and produce the mouth of a river, open the sewage draining exit of housing lower end; Concentrated water drainage is gone out, in the 6th step, open air inlet; And sewage draining exit connected water pipe, air inlet air inlet, sewage draining exit water inlet; The hydraulic pressure of sewage draining exit is normal pressure, utilizes hydraulic pressure that the film silk is washed away from the bottom to top, forms the gas-liquid purge flow; The film silk is under the double action of shake and gas-liquid two-phase flow, and the pollutant on adhesive film silk surface washes away, and discharges via water inlet.
As more preferably, when the first step, just open air inlet, carry out gas distribution always.In former water treatment procedure, gas distribution can guarantee that film bundle spare pollutes the bonding membranous wall when filtration operation, and in the cleaning process, realizes the gas-liquid two-phase flow flushing.
The filtering technique of a kind of external doughnut porous membrane bundle of corresponding said system; Pressure is 0.02-0.1MPa to compressed air at membrane module air inlet place; According to the difference of raw water quality, general normal filtration process flow operation cleaned 20-30 and can accomplish effective cleaning second after 60-120 minute; Recover membrane flux, reach satisfied cleaning performance.According to film of the present invention system, former water influent turbidity can reach 500NTU, and delivery turbidity is no more than 0.1NTU.
Cleaning process: the cleaning fluid inlet pressure is 0.025-0.1MPa; Compressed air is 0.02-0.1Mpa, and elder generation with said pressure, feeds oil-free compressed air 2-10 second with pulse or continuation mode at air inlet; Stop ventilation; Change into cleaning fluid import (being sewage draining exit) and use cleaning fluid, clean 5-10 second, feed cleaning fluid and oil-free compressed air then simultaneously and carry out gas-liquid two-phase cleaning 10-20 second with pulse or continuation mode with said pressure.
After the cleaning, system produces water flux can return to the 100-150L/m2.h when initial.
The another kind of filtering technique of a kind of external doughnut porous membrane bundle of corresponding said system, the first step is sent into pending former water in the housing by central tube, opens air inlet; Carry out gas distribution, in second step, pending former water is flowed out by the water distributing pore on the central tube outer wall and was distributed in the gap of U-shaped hollow-fibre membrane for the 3rd step; The water that purifies is through the micropore entering film silk inner chamber that is clouded on the hollow membranous wall, and in the 4th step, the place is communicated with the product water pump at the product mouth of a river, and the opening on the water process film silk of the purification in the U-shaped hollow-fibre membrane is collected in collecting chamber; Assembly is left at the multiparity mouth of a river again, and the dense water that is come out by sewage draining exit is back in the central tube with former water through circulating pump, the 5th step; Sewage draining exit is connected water pipe, air inlet air inlet, sewage draining exit water inlet; The hydraulic pressure of sewage draining exit is normal pressure, utilizes hydraulic pressure that the film silk is washed away from the bottom to top, forms the gas-liquid purge flow; The film silk is under the double action of shake and gas-liquid two-phase flow, and the pollutant on adhesive film silk surface washes away, and discharges via water inlet.
When the first step, just open air inlet, carry out gas distribution always.In former water treatment procedure, gas distribution can guarantee that film bundle spare pollutes the bonding membranous wall when filtration operation, and in the cleaning process, realizes the gas-liquid two-phase flow flushing.
The another kind of filtering technique of a kind of external doughnut porous membrane bundle of corresponding said system; Pressure is 0.02-0.1MPa to compressed air at membrane module air inlet place; According to the difference of raw water quality, general normal filtration process flow operation cleaned 20-30 and can accomplish effective cleaning second after 60-120 minute; Recover membrane flux, reach satisfied cleaning performance.According to film of the present invention system, former water influent turbidity can reach 500NTU, and delivery turbidity is no more than 0.1NTU.
Cleaning process: the cleaning fluid inlet pressure is 0.025-0.1MPa; Compressed air is 0.02-0.1Mpa, and elder generation with said pressure, feeds oil-free compressed air 2-10 second with pulse or continuation mode at air inlet; Stop ventilation; Change into cleaning fluid import (being sewage draining exit) and use cleaning fluid, clean 5-10 second, feed cleaning fluid and oil-free compressed air then simultaneously and carry out gas-liquid two-phase cleaning 10-20 second with pulse or continuation mode with said pressure.
After the cleaning, system produces water flux can return to the 100-150L/m2.h when initial.
Therefore, the filtration system and the technology thereof of external doughnut porous membrane bundle of the present invention possess following advantage: adopt the gas-liquid two-phase flow process to clean, can effectively prevent dirty stifled; Improve membrane flux; Effective service time of prolongation system, simultaneously gas spout the bottom of film silk or in the middle of, can not damage the fixing root of film silk when letting the more effective shake of film silk again; Stability Analysis of Structures, effective; The film silk stressed evenly, easy fracture not, it is good that each organizes mould bundle independence, when breaking down, can under the situation that does not influence remainder work, in time change; And take up an area of for a short time, and energy consumption is low, and is easy to operate, and equipment is few, reduced investment, effluent characteristics is good, and treatment effeciency is higher, and the cycle of operation is longer.
Description of drawings
Fig. 1 is the sketch map of the filtration system of external doughnut porous membrane bundle of the present invention.
Fig. 2 be among Fig. 1 A to sketch map.
Fig. 3 be among Fig. 1 B to a kind of sketch map.
Fig. 4 be among Fig. 1 B to another kind of sketch map.
Fig. 5 is the another kind of sketch map of the filtration system of external doughnut porous membrane bundle of the present invention.
Fig. 6 is that the C of Fig. 5 is to sketch map.
Fig. 7 is another sketch map of the present invention.
The specific embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically the technical scheme of invention.
Embodiment 1:
As shown in Figure 1; A kind of filtration system of external doughnut porous membrane bundle; Comprise upper cover 1, low head 18 and cylindrical shell 10, upper and lower end socket lays respectively at the two ends of cylindrical shell 10, and a cylindrical shell end circle 15 is respectively arranged at the two ends up and down of cylindrical shell; Between upper cover 1, low head and the cylindrical shell end circle O RunddichtringO 16 is arranged, through fixing through anchor ear 6 again after the sealing of O RunddichtringO.Upper and lower end socket and cylindrical shell 10 connect into one have a cavity housing.Center fixation at housing has a central tube 12; The upper end of central tube 12 is connected with water inlet; Water inlet is connected with external equipment through water inlet loose joint 2, and water inlet is positioned at upper cover 1 upper end, and water inlet is connected on the central tube 12 through water distribution tube connector 8; Water distribution tube connector 8 is positioned at upper cover 1, seals through plug 13 in the lower end of central tube 18.On upper cover 1, also be connected with through a transparent tube 4 simultaneously and produce the mouth of a river, produce the mouth of a river and link to each other with the outside through producing water loose joint 3, water inlet is parallel with the product mouth of a river, on the outer wall of central tube 18, offers a plurality of water distributing pores 20.As shown in Figure 2; With central tube 12 is the center, and U-shaped hollow-fibre membrane 9 is installed in housing, and the free end of U-shaped hollow-fibre membrane 9 is cast in and forms pouring layer 7 together; Pouring layer 7 is positioned at upper cover 1, O RunddichtringO 5 sealings on passing through between water distribution tube connector 8 and the pouring layer 7.The blind end of U-shaped hollow-fibre membrane 9 is positioned at the housing lower end, and the length of U-shaped hollow-fibre membrane 9 is 90% of cylindrical shell length.The length that central tube 12 is provided with the part of water distributing pore 20 equates with U-shaped hollow-fibre membrane 9.Axial direction at central tube 12 is fixed with three support bodys 11; Support body 11 comprises three layers of support; Every layer of support comprises center fixing part 21 and brace rod 22, and center fixing part 21 is fixed on the central tube 12, on center fixing part 21, is connected with brace rod 22; Brace rod 22 is that the center is radial and is uniformly distributed with center fixing part 21, and brace rod 22 is divided into a plurality of U-shaped hollow fiber bundles with U-shaped hollow-fibre membrane 9.As shown in Figure 3, an air-spreading disk 14 is arranged below the U-shaped hollow fiber membrane bundle, air-spreading disk 14 is rounded; On the card of air-spreading disk 14, be divided into four parts; Wherein two parts are to offer gas distribution bar 23, and two other part is to offer qi-emitting hole 24, gas distribution bar zone and qi-emitting hole zone interlaced arrangement.On air-spreading disk 14, connect air inlet, air inlet is opened on the low head 18, the center line of air inlet and the central lines of water inlet.Air inlet links to each other with external feed stream equipment through air inlet loose joint 19, offers a sewage draining exit in the side of low head 18, and the center line of sewage draining exit is vertical with the center line of air inlet, and sewage draining exit links to each other with outside pollution discharge pond through blowdown loose joint 17.On water producing pipe, also have a peephole (not shown), when cleaning, judged whether film silk fracture of wire through peephole, if fracture of wire is arranged, when air purge, casting area can produce great amount of bubbles.
A kind of filtering technique of immersion doughnut porous membrane bundle, the first step is sent into pending former water in the housing by the central tube pressurization, opens the air inlet air inlet simultaneously; In second step, pending former water is flowed out by the water distributing pore on the central tube outer wall and is distributed in the gap of U-shaped hollow-fibre membrane, and in the 3rd step, the water of purification sees through the micropore that is clouded on the hollow membranous wall and gets into film silk inner chamber; In the 4th step, the place is communicated with water producing pipe at the product mouth of a river, and the water with the purification in the U-shaped hollow-fibre membrane under the intake pressure effect is collected in collecting chamber through the opening on the film silk, and assembly is left at the multiparity mouth of a river again; The 5th step, after water is produced in collection, close water inlet and produce the mouth of a river, open the sewage draining exit of housing lower end; Concentrated water drainage is gone out, in the 6th step, open air inlet; And sewage draining exit connected water pipe, air inlet air inlet, sewage draining exit water inlet; The hydraulic pressure of sewage draining exit is normal pressure, utilizes hydraulic pressure that the film silk is washed away from the bottom to top, forms the gas-liquid purge flow; The film silk is under the double action of shake and gas-liquid two-phase flow, and the pollutant on adhesive film silk surface washes away, and the flushing flow process finishes after discharged by water inlet.
Embodiment 2:
As shown in Figure 4, different with embodiment 1 is, air-spreading disk 14 comprises the central part 25 that overlaps with the central tube center, and the one-body molded rib 26 that a plurality of symmetric arrangement are arranged offers qi-emitting hole 24 on rib 26 on central part 25.
Embodiment 3:
As illustrated in Figures 5 and 6, different with embodiment 1 is that air inlet is connected with an admission line 27; Admission line 27 pulls out two air inlet by-paths 28 and is connected on the center fixing part 21 of every layer of support of support body 11, and center fixing part 21 is the cavity of hollow, and the part that air inlet by-path 28 passes center fixing part is provided with opening; Gas is imported in the center fixing part 21, and the brace rod 22 of support body is a hollow tube body, on the outer surface of brace rod, offers pore 29; The gas center fixing part and then is outwards sprayed by the pore on the brace rod 29 in brace rod, because brace rod divides the film forming tow with the film silk; And it is, better to the cleaning performance of film silk near the film silk.
Embodiment 4:
As shown in Figure 7, different with embodiment 1 is, a kind of filtration system of external doughnut porous membrane bundle is connected with circulating line 30 at the sewage draining exit place, and circulating line is provided with circulating pump 31, and the other end of circulating line is connected the water inlet of central tube.The sewage draining exit place is connected with sewage vent line 32 simultaneously, is used for the sewage after the discharge cycle.
A kind of filtering technique of external doughnut porous membrane bundle, the first step is sent into pending former water in the housing by central tube, opens air inlet; Carry out gas distribution, in second step, pending former water is flowed out by the water distributing pore on the central tube outer wall and was distributed in the gap of U-shaped hollow-fibre membrane for the 3rd step; The water that purifies is through the micropore entering film silk inner chamber that is clouded on the hollow membranous wall, and in the 4th step, the place is communicated with the product water pump at the product mouth of a river, and the opening on the water process film silk of the purification in the U-shaped hollow-fibre membrane is collected in collecting chamber; Assembly is left at the multiparity mouth of a river again, and the dense water that is come out by sewage draining exit is back in the central tube with former water through circulating pump, the 5th step; Sewage draining exit is connected water pipe, air inlet air inlet, sewage draining exit water inlet; The hydraulic pressure of sewage draining exit is normal pressure, utilizes hydraulic pressure that the film silk is washed away from the bottom to top, forms the gas-liquid purge flow; The film silk is under the double action of shake and gas-liquid two-phase flow, and the pollutant on adhesive film silk surface washes away, and discharges via water inlet.
Claims (11)
1. the filtration system of an external doughnut porous membrane bundle is characterized in that: comprise cylindrical shell, be respectively equipped with upper cover and low head at the two ends up and down of cylindrical shell; Be provided with central tube in the housing that upper and lower end socket and cylindrical shell constitute, offer water distributing pore on the outer wall of central tube, an end of central tube is connected with water inlet; The other end sealing of central tube; Be provided with water inlet and produce the mouth of a river at an end of housing, be provided with air inlet, sewage draining exit and distribution device, between upper and lower end socket, be provided with the U-shaped hollow-fibre membrane at the other end of housing; The upper end cast of U-shaped hollow-fibre membrane; U-shaped hollow-fibre membrane open upper end is positioned at upper cover, and water distributing pore is positioned at the below of the cast end of U-shaped hollow-fibre membrane, on central tube, is connected with support body.
2. the filtration system of external doughnut porous membrane bundle according to claim 1; It is characterized in that: described inlet duct comprises the air-spreading disk that is positioned at U-shaped hollow-fibre membrane below; Offer qi-emitting hole on the air-spreading disk; End at air-spreading disk is connected with air inlet, and air inlet is opened on the low head.
3. the filtration system of external doughnut porous membrane bundle according to claim 1; It is characterized in that: described inlet duct comprises the air inlet that is arranged on the low head; Air inlet is connected with admission line, and admission line is connected with the outer support body of central tube, on support body, offers pore; On admission line, be connected with air-spreading disk simultaneously, offer qi-emitting hole on the air-spreading disk.
4. the filtration system of external doughnut porous membrane bundle according to claim 3; It is characterized in that: described support body comprises the multilayer support that is parallel to each other; Described support comprises center fixing part and brace rod, and center fixing part is fixed on the central tube, on center fixing part, is connected with the tubular support muscle of hollow; Admission line in center fixing part, is furnished with pore on the described brace rod through the cross-under of air inlet by-path.
5. the filtration system of external doughnut porous membrane bundle according to claim 1 and 2; It is characterized in that: described support body comprises the multilayer support that is parallel to each other; Described support comprises center fixing part and brace rod, and center fixing part is fixed on the central tube, on center fixing part, is connected with brace rod; Brace rod is that the center is radial and is uniformly distributed with the center fixing part, and brace rod is divided into some bundles with the U-shaped hollow-fibre membrane.
6. according to the filtration system of any described external doughnut porous membrane bundle of claim 1 to 4, it is characterized in that: described air-spreading disk be positioned at housing under; In the form of annular discs or the rib strip shaped of air-spreading disk, the qi-emitting hole zone and the gas distribution bar that offer interlaced arrangement on the discoid air-spreading disk are regional; The air-spreading disk of rib strip shaped comprises the central part that overlaps with the central tube center, and the one-body molded rib that a plurality of symmetric arrangement are arranged offers qi-emitting hole on rib on central part.
7. according to the filtration system of any described external doughnut porous membrane bundle of claim 1 to 4; It is characterized in that: described central tube is positioned at the center of housing; Central tube is provided with the length of part of water distributing pore smaller or equal to the length of U-shaped hollow-fibre membrane; The casting area of described U-shaped hollow-fibre membrane upper end is positioned at upper cover and cylindrical shell intersection, and the length of described U-shaped hollow-fibre membrane is 90% ~ 95% of cylindrical shell length.
8. according to the filtration system of any described external doughnut porous membrane bundle of claim 1 to 4; It is characterized in that: be connected with circulating line at described sewage draining exit; On circulating line, be connected with circulating pump, the other end of circulating line is connected with water inlet.
9. the filtering technique of an external doughnut porous membrane bundle is characterized in that: the first step, pending former water was sent in the housing second step by the water inlet pressurization of central tube; Pending former water is flowed out by the water distributing pore on the central tube outer wall and is distributed in the gap of U-shaped hollow-fibre membrane, and in the 3rd step, the water of purification sees through the micropore that is clouded on the hollow membranous wall and gets into film silk inner chamber, the 4th step; The place is communicated with water producing pipe at the product mouth of a river, and the water with the purification in the U-shaped hollow-fibre membrane under the intake pressure effect is collected in collecting chamber through the opening on the film silk, and assembly is left at the multiparity mouth of a river again, the 5th step; After collecting product water, close water inlet and produce the mouth of a river, open the sewage draining exit of housing lower end; Concentrated water drainage is gone out, in the 6th step, open air inlet; And sewage draining exit connected water pipe, air inlet air inlet, sewage draining exit water inlet; The hydraulic pressure of sewage draining exit is normal pressure, utilizes hydraulic pressure that the film silk is washed away from the bottom to top, forms the gas-liquid purge flow; The film silk is under the double action of shake and gas-liquid two-phase flow, and the pollutant on adhesive film silk surface washes away, and discharges via water inlet.
10. the filtering technique of external doughnut porous membrane bundle according to claim 9 is characterized in that: when the first step, just open air inlet, carry out gas distribution always.
11. the filtering technique of an external doughnut porous membrane bundle is characterized in that: the first step, pending former water is sent in the housing by central tube, open air inlet; Carry out gas distribution, in second step, pending former water is flowed out by the water distributing pore on the central tube outer wall and was distributed in the gap of U-shaped hollow-fibre membrane for the 3rd step; The water that purifies is through the micropore entering film silk inner chamber that is clouded on the hollow membranous wall, and in the 4th step, the place is communicated with the product water pump at the product mouth of a river, and the opening on the water process film silk of the purification in the U-shaped hollow-fibre membrane is collected in collecting chamber; Assembly is left at the multiparity mouth of a river again, and the dense water that is come out by sewage draining exit is back in the central tube with former water through circulating pump, the 5th step; Sewage draining exit is connected water pipe, air inlet air inlet, sewage draining exit water inlet; The hydraulic pressure of sewage draining exit is normal pressure, utilizes hydraulic pressure that the film silk is washed away from the bottom to top, forms the gas-liquid purge flow; The film silk is under the double action of shake and gas-liquid two-phase flow, and the pollutant on adhesive film silk surface washes away, and discharges via water inlet.
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| CN114275878A (en) * | 2021-12-31 | 2022-04-05 | 杭州凯洁膜分离技术有限公司 | External detachable suspension type membrane bioreactor device with moisturizing function |
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Application publication date: 20120912 Assignee: Zhejiang Think Energy Technology Co., Ltd. Assignor: Huzhou Sikeneng New Materials Co.,Ltd. Contract record no.: 2015330000066 Denomination of invention: External filtering system for hollow fiber porous membrane bundle and technology thereof Granted publication date: 20141224 License type: Exclusive License Record date: 20150417 |
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