WO2014192433A1 - 濾過装置及びこれを用いた浸漬式濾過方法 - Google Patents
濾過装置及びこれを用いた浸漬式濾過方法 Download PDFInfo
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- WO2014192433A1 WO2014192433A1 PCT/JP2014/060295 JP2014060295W WO2014192433A1 WO 2014192433 A1 WO2014192433 A1 WO 2014192433A1 JP 2014060295 W JP2014060295 W JP 2014060295W WO 2014192433 A1 WO2014192433 A1 WO 2014192433A1
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- hollow fiber
- filtration
- fiber membrane
- holding member
- bubbles
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/18—Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/02—Hollow fibre modules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/02—Hollow fibre modules
- B01D63/04—Hollow fibre modules comprising multiple hollow fibre assemblies
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
- C02F3/1273—Submerged membrane bioreactors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/08—Flow guidance means within the module or the apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/26—Specific gas distributors or gas intakes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2315/00—Details relating to the membrane module operation
- B01D2315/06—Submerged-type; Immersion type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/18—Use of gases
- B01D2321/185—Aeration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Definitions
- the present invention relates to a filtration device and an immersion filtration method using the same.
- Filtration devices having filtration modules in which a plurality of hollow fiber membranes are converged are used as solid-liquid separation treatment devices in sewage treatment and pharmaceutical manufacturing processes.
- the outer peripheral surface side of the hollow fiber membrane is set to a high pressure, and the liquid to be processed is passed through the inner peripheral surface side of the hollow fiber membrane by an external pressure type, osmotic pressure or negative pressure on the inner peripheral surface side.
- an immersion type that permeates to the inner peripheral surface side
- an internal pressure type that allows the liquid to be treated to permeate the outer peripheral surface side of the hollow fiber membrane with a high pressure on the inner peripheral surface side of the hollow fiber membrane.
- the external pressure type and the immersion type are contaminated with the use of substances contained in the liquid to be treated as the surface of each hollow fiber membrane is contaminated. Therefore, a cleaning method (air scrubbing) in which bubbles are sent from below the filtration module, the surface of each hollow fiber membrane is rubbed, and each hollow fiber membrane is further vibrated to remove deposits has been used (special feature). No. 2010-42329).
- the conventional filtration device cleaning bubbles having a small volume are continuously supplied.
- the diameter of the bubbles is generally on the order of several mm.
- the conventional filtration device cleaning with gas has a small volume of bubbles and a small pressure applied to the hollow fiber membrane at the time of surface rubbing, which may result in insufficient removal of deposits.
- the present invention has been made on the basis of the circumstances as described above, and provides a filtration device that is excellent in cleaning performance of the surface of the hollow fiber membrane and can maintain high filtration capability, and a filtration method using this filtration device. Objective.
- An immersion type filtration device comprising a filtration module having a plurality of hollow fiber membranes held in a state aligned in one direction, and a gas supply device for supplying bubbles from below the filtration module,
- the bubbles supplied from the gas supplier are divided into a plurality of bubbles after colliding with the filtration module.
- Another invention made in order to solve the said subject is: It is an immersion filtration method using the filtration device.
- the filtration device and the immersion filtration method of the present invention are excellent in the cleaning ability of the hollow fiber membrane surface and can maintain a high filtration ability. That is, the filtration device and the immersion filtration method of the present invention can wash the hollow fiber membrane surface uniformly and at a high pressure.
- FIG. 1 is a schematic explanatory view showing a filtration device according to an embodiment of the present invention.
- FIG. 2A is a schematic plan view showing a lower holding member included in the filtration module of the filtration apparatus of FIG.
- FIG. 2B is a cross-sectional view taken along line AA of the lower holding member of FIG. 2A.
- FIG. 3A is a schematic plan view of a filtration device according to an embodiment different from the filtration device of FIG. 1 as viewed from above.
- FIG. 3b is a cross-sectional view of the filtration device of FIG. 3a taken along line BB.
- FIG. 4 is a schematic cross-sectional view showing a lower holding member having a shape different from that of the lower holding member of FIG. 2b.
- FIG. 1 is a schematic explanatory view showing a filtration device according to an embodiment of the present invention.
- FIG. 2A is a schematic plan view showing a lower holding member included in the filtration module of the filtration apparatus of FIG.
- FIG. 5 is a schematic plan view showing a lower holding member having a shape different from that of the lower holding member of FIG. 2a.
- FIG. 6 is a graph showing the operation results of Example 1.
- FIG. 7 is a graph showing the operation results of Example 2.
- FIG. 8 is a graph showing the operation results of Comparative Example 1.
- the present invention is An immersion type filtration device comprising a filtration module having a plurality of hollow fiber membranes held in a state aligned in one direction, and a gas supply device for supplying bubbles from below the filtration module, In the filtration device, the bubbles supplied from the gas supplier are divided into a plurality of bubbles after colliding with the filtration module.
- the bubbles supplied from the gas supply device are divided into a plurality of bubbles by the hollow fiber membrane or its holding member, and rise while contacting the surface of the hollow fiber membrane.
- the divided bubbles have an average diameter close to the interval between the hollow fiber membranes and are easily spread uniformly between the hollow fiber membranes. Therefore, the surface of the hollow fiber membrane can be thoroughly cleaned by the divided bubbles.
- the above-mentioned divided bubbles have a higher rising speed than conventional fine bubbles, the surface of the hollow fiber membrane can be effectively cleaned with a high rubbing pressure.
- the present inventors make it easy to rock the hollow fiber membrane by the bubbles divided by the hollow fiber membrane or the holding member as described above, and the pressure loss of the filtration module is increased by the rocking of the hollow fiber membrane. It was found that it can be remarkably suppressed.
- the hollow fiber membranes come into contact with each other by water flow, and impurities accumulate between the contacted hollow fiber membranes to reduce the surface area of the hollow fiber membranes. The pressure loss of the filtration module tends to increase.
- the hollow fiber membranes of the filtration module are effectively swung by the divided bubbles, so that the hollow fiber membranes can be separated from each other, and impurities deposited on the surface of the hollow fiber membranes are also present. Can be removed. Therefore, the said filtration apparatus can maintain a filtration capability at a high level compared with the conventional filtration apparatus.
- the average horizontal diameter of the bubbles supplied from the gas supply device is larger than the maximum interval between the holding portions of the plurality of hollow fiber membranes of the filtration module.
- the bubbles having an average diameter closer to the interval of the hollow fiber membranes more reliably can be spread uniformly between the hollow fiber membranes.
- the “average horizontal diameter of bubbles” means the average value of the minimum width in the horizontal direction immediately before the bubbles discharged from the gas supplier collide with the hollow fiber membrane or its holding member.
- the “maximum interval between the holding portions of the hollow fiber membranes” means the maximum of the intervals between the holding portions of the adjacent hollow fiber membranes.
- the filtration module has an upper holding member and a lower holding member for positioning a plurality of hollow fiber membranes in the vertical direction, and the upper holding member communicates with the upper openings of the plurality of hollow fiber membranes, It is preferable that the gas supply device is located below the lower holding member.
- the filtration device may further include a guide cover that surrounds at least the upper sides of the plurality of hollow fiber membranes. .
- the immersion filtration method using the filtration device can efficiently wash the surface of the hollow fiber membrane, and can maintain a high treatment capacity at a low running cost.
- the filtration device 1 in FIG. 1 includes a filtration module 2 and a gas supplier 3 that supplies bubbles from below the filtration module 2 and is used by being immersed in a filtration tank X storing a liquid to be treated.
- the filtration module 2 includes a plurality of hollow fiber membranes 4 aligned in the vertical direction, and an upper holding member 5 and a lower holding member 6 that position the plurality of hollow fiber membranes 4 in the vertical direction.
- the hollow fiber membrane 4 is a porous hollow fiber membrane that allows water to permeate through the inner hollow portion while preventing permeation of particles contained in the liquid to be treated.
- thermoplastic resin can be a main component.
- the thermoplastic resin include polyethylene, polypropylene, polyvinylidene fluoride, ethylene-vinyl alcohol copolymer, polyamide, polyimide, polyetherimide, polystyrene, polysulfone, polyvinyl alcohol, polyphenylene ether, polyphenylene sulfide, cellulose acetate, and polyacrylonitrile.
- PTFE polytetrafluoroethylene
- PTFE which is excellent in chemical resistance, heat resistance, weather resistance, nonflammability and the like and is porous is preferable, and uniaxially or biaxially stretched PTFE is more preferable.
- the material for forming the hollow fiber membrane 4 may be appropriately mixed with other polymers, additives such as lubricants, and the like.
- the hollow fiber membrane 4 has a multilayer structure in order to achieve both water permeability and mechanical strength, and to make the surface cleaning effect due to air bubbles effective.
- the hollow fiber membrane 4 preferably includes an inner support layer and a filtration layer laminated on the surface of the support layer.
- a tube obtained by extruding a thermoplastic resin can be used as the support layer.
- the support layer can be given mechanical strength and pores can be easily formed.
- the tube is preferably stretched at a stretching ratio of 50% to 700% in the axial direction and 5% to 100% in the circumferential direction.
- the stretching temperature is preferably not higher than the melting point of the tube material, for example, about 0 to 300 ° C. Stretching at a low temperature is good for obtaining a porous body having a relatively large pore diameter, and stretching at a high temperature is good for obtaining a porous body having a relatively small pore diameter.
- the stretched porous body can have high dimensional stability by being heat treated at a temperature of 200 to 300 ° C. for about 1 to 30 minutes with both ends fixed and stretched. Moreover, the pore size of the porous body can be adjusted by combining conditions such as stretching temperature and stretching ratio.
- the tube for forming the support layer can be obtained by, for example, blending a liquid lubricant such as naphtha with PTFE fine powder and forming the tube by extrusion or the like and then stretching it. it can. Further, dimensional stability can be improved by holding and sintering the tube for several tens of seconds to several minutes in a heating furnace maintained at a temperature equal to or higher than the melting point of PTFE fine powder, for example, about 350 to 550 ° C. .
- the lower limit of the number average molecular weight of the PTFE fine powder is preferably 500,000, more preferably 2 million.
- the upper limit of the number average molecular weight of the PTFE fine powder is preferably 20 million. When the number average molecular weight of the PTFE fine powder exceeds the upper limit, it may be difficult to form the pores of the hollow fiber membrane 4.
- the number average molecular weight is a value measured by gel filtration chromatography.
- the average thickness of the support layer is preferably from 0.1 mm to 3 mm.
- the filtration layer can be formed, for example, by winding a thermoplastic resin sheet around the support layer and sintering the sheet.
- a sheet as a material for forming the filtration layer, stretching can be easily performed, and the shape and size of the pores can be easily adjusted, and the thickness of the filtration layer can be reduced.
- the sintering temperature is preferably equal to or higher than the melting point of the tube forming the support layer and the sheet forming the filtration layer.
- the sheet for forming the filtration layer is, for example, (1) a method in which an unsintered molded body obtained by extruding a resin is stretched at a temperature below the melting point and then sintered, and (2) the sintered resin molded body is gradually cooled.
- a method of stretching after increasing the crystallinity can be used.
- the sheet is preferably stretched at a stretching ratio of 50% to 1000% in the longitudinal direction and 50% to 2500% in the lateral direction. In particular, by setting the stretching ratio in the short direction to the above range, the mechanical strength in the circumferential direction can be improved when the sheet is wound, and the durability against surface cleaning by a large volume of bubbles can be improved. .
- a filtration layer is formed by wrapping a sheet around a tube that forms a support layer
- fine irregularities may be provided on the outer peripheral surface of the tube.
- the number of times the sheet is wound can be adjusted according to the thickness of the sheet, and can be one or more times.
- a plurality of sheets may be wound around the tube.
- the method of winding the sheet is not particularly limited, and a method of winding in a spiral shape may be used in addition to a method of winding in the circumferential direction of the tube.
- the size (level difference) of the fine irregularities is preferably 20 ⁇ m or more and 200 ⁇ m or less.
- the fine irregularities are preferably formed on the entire outer peripheral surface of the tube, but may be formed partially or intermittently.
- examples of the method for forming the fine irregularities on the outer peripheral surface of the tube include surface treatment with flame, laser irradiation, plasma irradiation, and dispersion coating of fluorine-based resin. Surface treatment with a flame that can easily form irregularities without giving is preferable.
- non-fired tube and sheet may be used, and the adhesion may be enhanced by sintering after winding the sheet.
- the average thickness of the filtration layer is preferably 5 ⁇ m or more and 100 ⁇ m or less. By setting the average thickness of the filtration layer within the above range, high filtration performance can be easily and reliably imparted to the hollow fiber membrane 4.
- the upper limit of the average outer diameter of the hollow fiber membrane 4 is preferably 6 mm, and more preferably 4 mm. If the average outer diameter of the hollow fiber membrane 4 exceeds the upper limit, the ratio of the surface area to the cross-sectional area of the hollow fiber membrane 4 may be reduced, and the filtration efficiency may be reduced.
- the lower limit of the average outer diameter of the hollow fiber membrane 4 is preferably 2 mm, more preferably 2.1 mm. When the average outer diameter of the hollow fiber membrane 4 is less than the above lower limit, the mechanical strength of the hollow fiber membrane 4 may be insufficient.
- the upper limit of the average inner diameter of the hollow fiber membrane 4 is preferably 4 mm, and more preferably 3 mm.
- the thickness of the hollow fiber membrane 4 may be reduced, and the mechanical strength and the impurity permeation preventing effect may be insufficient.
- the lower limit of the average inner diameter of the hollow fiber membrane 4 is preferably 0.5 mm, more preferably 0.9 mm.
- the upper limit of the ratio of the average inner diameter to the average outer diameter of the hollow fiber membrane 4 is preferably 0.8, and more preferably 0.6. If the ratio of the average inner diameter to the average outer diameter of the hollow fiber membrane 4 exceeds the above upper limit, the thickness of the hollow fiber membrane 4 becomes small, the mechanical strength, the permeation-preventing effect of impurities, and the durability against the surface cleaning by the large volume of bubbles. May be insufficient.
- the lower limit of the ratio of the average inner diameter to the average outer diameter of the hollow fiber membrane 4 is preferably 0.3, and more preferably 0.4. When the ratio of the average inner diameter to the average outer diameter of the hollow fiber membrane 4 is less than the above lower limit, the thickness of the hollow fiber membrane 4 may become larger than necessary, and the water permeability of the hollow fiber membrane 4 may be lowered.
- the average length of the hollow fiber membrane 4 is not particularly limited, and can be, for example, 1 m or more and 6 m or less.
- the average length of the hollow fiber membrane 4 means an average distance from the upper end portion fixed to the upper holding member 5 to the lower end portion fixed to the lower holding member 6, and as described later, one hollow fiber When the membrane 4 is curved in a U-shape and this curved portion is fixed to the lower holding member 6 as a lower end portion, it means an average distance from the lower end portion to the upper end portion (opening portion).
- the upper limit of the porosity of the hollow fiber membrane 4 is preferably 90%, and more preferably 85%. When the porosity of the hollow fiber membrane 4 exceeds the above upper limit, the mechanical strength and scratch resistance of the hollow fiber membrane 4 may be insufficient.
- the lower limit of the porosity of the hollow fiber membrane 4 is preferably 75%, more preferably 78%. When the porosity of the hollow fiber membrane 4 is less than the above lower limit, the water permeability is lowered and the filtration ability of the filtration device 1 may be lowered.
- the porosity refers to the ratio of the total volume of pores to the volume of the hollow fiber membrane 4 and can be determined by measuring the density of the hollow fiber membrane 4 in accordance with ASTM-D-792.
- the upper limit of the area occupancy rate of the pores of the hollow fiber membrane 4 is preferably 60%. If the area occupation ratio of the pores exceeds the above upper limit, the surface strength of the hollow fiber membrane 4 becomes insufficient, and there is a possibility that the hollow fiber membrane 4 may be damaged by rubbing bubbles.
- the lower limit of the area occupation ratio of the holes of the hollow fiber membrane 4 is preferably 40%. When the area occupancy rate of the pores is less than the above lower limit, the water permeability is lowered, and the filtration ability of the filtration device 1 may be lowered.
- the pore area occupancy means the ratio of the total area of pores on the outer peripheral surface (filtration layer surface) of the hollow fiber membrane 4 to the surface area of the hollow fiber membrane 4, and the ratio of the outer peripheral surface of the hollow fiber membrane 4 It can be obtained by analyzing an electron micrograph.
- the upper limit of the average pore diameter of the hollow fiber membrane 4 is preferably 0.45 ⁇ m, more preferably 0.1 ⁇ m.
- the lower limit of the average diameter of the pores of the hollow fiber membrane 4 is preferably 0.01 ⁇ m.
- the average pore diameter means the average pore diameter on the outer peripheral surface (filtration layer surface) of the hollow fiber membrane 4, and is a pore diameter distribution measuring device (for example, Porus Materials Corp. porous material automatic pore diameter). It can be measured by a distribution measurement system).
- the lower limit of the tensile strength of the hollow fiber membrane 4 is preferably 50N, more preferably 60N. When the tensile strength of the hollow fiber membrane 4 is less than the above lower limit, the durability against surface cleaning by a large volume of bubbles may be reduced.
- the upper limit of the tensile strength of the hollow fiber membrane 4 is generally 150N.
- the tensile strength means the maximum tensile stress when a tensile test is performed at a distance between marked lines of 100 mm and a test speed of 100 mm / min in accordance with JIS-K7161: 1994.
- the upper holding member 5 is a member that holds the upper ends of the plurality of hollow fiber membranes 4, communicates with the upper openings of the plurality of hollow fiber membranes 4 and collects the filtered liquid (collection header).
- a discharge pipe 7 is connected to the discharge portion, and the filtered liquid that has permeated into the hollow fiber membranes 4 is discharged.
- the outer shape of the upper holding member 5 is not particularly limited, and the cross-sectional shape can be a polygonal shape, a circular shape, or the like.
- the lower holding member 6 is a member that holds the lower ends of the plurality of hollow fiber membranes 4.
- the lower holding member 6 has an outer frame 6a and a plurality of fixing portions 6b for fixing the lower end portion of the hollow fiber membrane 4 as shown in FIGS. 2a and 2b.
- the fixing portion 6b is formed, for example, in a rod shape, and a plurality of fixing portions 6b are arranged substantially in parallel with a predetermined interval, and a plurality of hollow fiber membranes 4 are arranged on the upper side. In this way, by disposing the fixed portions 6b substantially in parallel at regular intervals, the bubbles can be more uniformly divided.
- one end of the hollow fiber membrane 4 may be fixed by the upper holding member 5 and the lower holding member 6, respectively, but the single hollow fiber membrane 4 is curved in a U shape so that two openings are provided. May be fixed by the upper holding member 5, and the lower end folded (curved) portion may be fixed by the lower holding member 6.
- the outer frame 6a is a member for supporting the fixing part 6b.
- the length of one side of the outer frame 6a can be, for example, 50 mm or more and 200 mm or less.
- the cross-sectional shape of the outer frame 6a is not particularly limited, and may be other polygonal shapes or circular shapes other than the quadrangular shape shown in FIG. 2a.
- Bubbles B supplied from a gas supplier 3 to be described later are divided into a plurality of bubbles B ′ by colliding with the fixed portion 6b, and the divided bubbles B ′ pass through the gaps between the fixed portions 6b to form a hollow fiber membrane. 4.
- the plurality of fixing parts 6b are arranged with their vertical positions aligned.
- the width (length in the short direction) of the fixing portion 6b and the interval between the fixing portions 6b are not particularly limited as long as a sufficient number of the hollow fiber membranes 4 can be fixed and the bubbles supplied from the gas supply device 3 can be divided into a plurality of parts.
- the width of the fixed portion 6b can be, for example, 3 mm or more and 10 mm or less, and the interval between the fixed portions 6b can be, for example, 1 mm or more and 10 mm or less.
- the upper limit of the density (N / A) of the hollow fiber membranes 4 obtained by dividing the number N of the hollow fiber membranes 4 held by the lower holding member 6 by the area A of the hollow fiber membrane 4 is 15 / cm. 2 is preferable, and 12 / cm 2 is more preferable. If the density of the hollow fiber membranes 4 exceeds the above upper limit, the distance between the hollow fiber membranes 4 may be reduced, and the surface may not be sufficiently cleaned, or the hollow fiber membranes 4 may not be sufficiently oscillated.
- the lower limit of the density of the hollow fiber membrane 4, preferably from 4 / cm 2, 6 present / cm 2 is more preferable.
- the “arrangement region of the hollow fiber membrane” means a virtual polygon having the smallest area among the virtual polygons including all the hollow fiber membranes 4 included in the filtration module 2 when viewed from the axial direction.
- the hollow fiber membrane 4 obtained by dividing the sum S of the cross-sectional areas of the hollow fiber membrane 4 held by the lower holding member 6 by the arrangement area area A of the hollow fiber membrane 4.
- the upper limit of the area ratio (S / A) is preferably 60%, more preferably 55%.
- the lower limit of the area ratio of the hollow fiber membrane 4 is preferably 20%, and more preferably 25%.
- the material of the upper holding member 5 and the lower holding member 6 is not particularly limited, and for example, epoxy resin, ABS resin, silicone resin, or the like can be used.
- the method of fixing the hollow fiber membrane 4 to the upper holding member 5 and the lower holding member 6 is not particularly limited, and for example, a method of fixing using an adhesive can be used.
- the upper holding member 5 and the lower holding member 6 are connected by a connecting member.
- a connecting member for example, a metal support rod, a resin casing (outer cylinder), or the like can be used.
- the gas supplier 3 supplies bubbles B for cleaning the surface of the hollow fiber membrane 4 from below the filtration module 2. As described above, the bubbles B are divided into a plurality of bubbles B ′ at the fixing portion 6b, and cleaning is performed by rubbing the surface of the hollow fiber membrane 4.
- This gas supply device 3 has one bubble discharge port. That is, the filtration device 1 has a bubble discharge port that corresponds to one filtration module 2 on a one-to-one basis.
- a known one can be used.
- the gas supply device 3 is immersed in the liquid to be treated together with the filtration module 2 and is continuously supplied from a compressor or the like through a supply pipe (not shown).
- the gas which supplies the bubble B by storing the gas which is stored inside and discharging the gas which became a fixed volume intermittently can be used.
- the average horizontal diameter of the bubbles supplied from the gas supply device 3 is larger than the maximum interval between the fixed portions (fixed portions to the fixed portion 6b) of the plurality of hollow fiber membranes 4 of the filtration module 2.
- the lower limit of the average horizontal diameter of the bubbles supplied from the gas supply device 3 is preferably twice the maximum interval between the fixed portions of the plurality of hollow fiber membranes 4 of the filtration module 2, more preferably 3 times, and 4 times. Is more preferable.
- the average horizontal diameter of the bubbles supplied from the gas supply device 3 is less than the above lower limit, the number and size of the bubbles after being divided at the fixing portion 6b are insufficient, and the ability to clean the surface of the hollow fiber membrane 4 by the bubbles is not good. May be sufficient.
- the “average horizontal diameter of bubbles” means the average value of the minimum width in the horizontal direction immediately before the bubbles discharged from the gas supply device 3 collide with the lower holding member 6. Further, the “maximum interval between the fixing portions of the hollow fiber membranes” means the maximum one of the intervals between the holding portions of the adjacent hollow fiber membranes 4 at the lower holding member 6.
- the gas supplied from the gas supplier 3 is not particularly limited as long as it is inert, but air is preferably used from the viewpoint of running cost.
- the said filtration apparatus 1 can be immersed and used for the filtration tank which stored the to-be-processed liquid which filters.
- Specific applications of the filtration device 1 include, for example, sewage treatment, industrial wastewater treatment, industrial tap water filtration, washing water treatment for machinery, pool water filtration, river water filtration, seawater filtration, and sterilization of fermentation processes. Or turbidity (enzyme or amino acid purification), filtration of food, liquor, beer, wine, etc.
- the filtration device 1 can be used in combination with powdered activated carbon. First, very fine dissolved organic matter is adsorbed by the powdered activated carbon, and water containing the powdered activated carbon after adsorbing the dissolved organic matter is filtered by the filtration device 1 so that the water purification treatment can be performed efficiently.
- sewage treatment In sewage treatment, it can be used in combination with a tank in which cells are propagated. Introducing sewage into this tank, the bacterial cells decompose and clean the contaminated components in the sewage, and then the sewage containing the bacterial cells is filtered by the filtration device 1 to efficiently perform sewage treatment. it can.
- the filtering device 1 since the average horizontal diameter of the bubbles B supplied from the gas supply device 3 is larger than the maximum interval between the fixed portions of the plurality of hollow fiber membranes 4, the bubbles B are fixed to the plurality of bubbles B by the fixing portion 6b. It is divided into 'and rises while contacting the surface of the hollow fiber membrane 4.
- the divided bubbles B ′ have an average diameter close to the interval between the hollow fiber membranes 4 and easily spread uniformly between the hollow fiber membranes 4. For this reason, the surface of the hollow fiber membrane 4 can be thoroughly cleaned by the divided bubbles B ′.
- the above-mentioned divided bubbles B ′ have a higher rising speed than the conventional minute bubbles, the surface of the hollow fiber membrane 4 can be effectively cleaned with a high rubbing pressure. Moreover, since the said division
- the filtration device 1 can easily swing the hollow fiber membrane 4 by the bubbles divided by the lower holding member 6.
- the filtration device 1 can effectively separate the hollow fiber membranes 4 from each other by effectively swinging the hollow fiber membranes 4 as well as removing impurities deposited on the surface of the hollow fiber membranes 4. Can do.
- the gas supply device 3 which stores the gas supplied continuously inside, discharges intermittently, and supplies a bubble, a bubble with a large volume can be easily and reliably produced at low cost. It can be supplied to the filtration module 2.
- [Second Embodiment] 3a and 3b includes a filtration module 2, a gas supplier 3 that supplies air bubbles from below the filtration module 2, and a guide cover 8 that surrounds the plurality of hollow fiber membranes 4 of the filtration module 2. It is used by being immersed in the filtration tank X storing the liquid to be treated. Since the filtration module 2 and the gas supply device 3 are the same as the filtration device 1 of the first embodiment, the same reference numerals are given and the description thereof is omitted.
- the guide cover 8 is a cylindrical body that surrounds the plurality of hollow fiber membranes 4 of the filtration module 2.
- the guide cover 8 surrounds at least the upper portion of the hollow fiber membrane 4 so that the cleaning bubbles B ′ are not dispersed above the filtration module 2.
- the guide cover 8 be installed apart from the upper holding member 5 in the vertical direction. That is, it is preferable that the guide cover 8 does not surround the upper holding member 5 and a space is formed between them. By separating the guide cover 8 and the upper holding member 5 in this way, impurities (slag) separated from the hollow fiber membrane 4 by bubbles are transferred from the space between the guide cover 8 and the upper holding member 5 to the outside of the filtration module 2. It can be discharged and the cleaning effect can be improved. On the other hand, it is preferable that the guide cover 8 surrounds a part of the lower holding member 6.
- the upper limit of the length L1 of the surrounding region is preferably 100%, more preferably 98%, and even more preferably 95% of the average distance L2 between the upper holding member 5 and the lower holding member 6.
- the length L1 of the surrounding area is less than the lower limit, the effect of preventing the dispersion of the bubbles B 'and the effect of improving the rising speed may be insufficient.
- the length L1 of the surrounding region exceeds the upper limit, impurities separated from the hollow fiber membrane 4 are difficult to be discharged outside the filtration module 2, and the cleaning effect may not be sufficiently improved.
- the lower limit of the average distance D1 between the inner surface of the guide cover 8 and the hollow fiber membrane 4 adjacent to the guide cover 8 is preferably 20 mm, more preferably 30 mm, and even more preferably 40 mm.
- the upper limit of the average distance D1 is preferably 400 mm, more preferably 250 mm, and even more preferably 100 mm.
- the average distance D1 exceeds the upper limit, the effect of preventing the dispersion of bubbles may be insufficient.
- the average distance D1 is less than the lower limit, the hollow fiber membrane 4 and the guide cover 8 may come into contact with each other, which may cause insufficient cleaning and swinging of the hollow fiber membrane 4, or the surface of the hollow fiber membrane 4 May wear out.
- the vertical distance D2 between the guide cover 8 and the upper holding member 5 can be, for example, 50 mm or more and 200 mm or less.
- the shape of the bottom surface of the guide cover 8 is not limited to the rectangle shown in FIG. 3a, and can be appropriately designed according to the outer shape of the upper holding member 5 and the lower holding member 6, the arrangement shape of the plurality of hollow fiber membranes 4, etc. It can be a circle or a polygon other than a rectangle.
- the material of the guide cover 8 for example, vinyl chloride resin, stainless steel or the like can be used in addition to the same resin as the upper holding member 5 and the lower holding member 6.
- the filtration device 11 includes a guide cover 8 that surrounds the hollow fiber membrane 4 of the filtration module 2, thereby preventing the cleaning bubbles B ′ from being dispersed as they rise and increasing the rising speed of the bubbles B ′. Can be improved. Therefore, the filtration device 11 is particularly excellent in the surface cleaning efficiency and the swinging effect of the hollow fiber membrane 4.
- the filtration device may include a plurality of filtration modules.
- one gas supply unit corresponding to the lower side of each filtration module may be provided one by one, or a plurality of bubble dischargers capable of supplying bubbles to the plurality of filtration modules.
- a gas supply having an outlet may be provided.
- the lower holding member 6 has a rod-like fixing portion 6b for holding a plurality of hollow fiber membranes 4, but the scope of the present invention is not limited to this. That is, for example, it is also possible that one fixing part 6b holds one hollow fiber membrane 4 and a plurality of the fixing parts are arranged with a gap.
- the adjacent fixing parts 6b may be arranged at different positions in the vertical direction.
- the shearing force of the fixing parts 6b with respect to the bubbles can be improved, and the bubbles can be divided more uniformly.
- the shape of the lower holding member 6 is not limited to the shape having the rod-like fixing portion 6b as in the above embodiment.
- the plate-like fixing portion 16 b may have a plurality of through holes.
- the gas supply device used in the filtration device only needs to be able to supply a sufficient volume of bubbles that are divided into a plurality of bubbles after colliding with the filtration module, and a bubble generation device (aeration device) other than those described in the above embodiment. ) May be used. Moreover, you may arrange
- the filtration module of the filtration device includes a hollow fiber membrane in which both ends of a plurality of hollow fiber membranes are fixed by an upper holding member and a lower holding member, and a discharge pipe is connected to both the upper holding member and the lower holding member. It can also be set as the structure which collects water from both ends. By collecting water from both ends of the hollow fiber membrane in this way, the pipe resistance in the hollow fiber membrane can be reduced to 1/8 compared to the case of collecting water from one end, and the water collection efficiency can be improved.
- the lower holding member has a planar shape shown in FIG.
- a water collecting passage is provided inside each of the plurality of fixing parts 6 b, and water is collected from the side surface of the lower holding member 6 by a discharge pipe. It is good to do. As a result, a space through which bubbles can pass can be provided on the lower surface of the lower holding member, and the bubbles supplied from the gas supply device are divided at the fixed portion and sent to the hollow fiber membrane efficiently as in the above embodiment. Can do.
- the alignment direction of the hollow fiber membranes of the filtration module is not limited to the vertical direction, and may be horizontal or diagonal. Even when the hollow fiber membranes are aligned in such a direction, the effect of the present invention can be exhibited by dividing the bubbles supplied from below between the hollow fiber membranes.
- Example 1 Using the filtration device including the filtration module, the gas supply device, and the guide cover shown in FIGS. 3a and 3b, the hollow when the liquid to be treated (sludge water) is filtered at a treatment speed of 0.7 m 3 / m 2 ⁇ day. Changes in the differential pressure inside and outside the membrane were measured.
- the average length of the hollow fiber membrane was 3.2 m
- the average outer diameter was 2.3 mm
- the average inner diameter was 1.1 mm
- the number was 740.
- the length of the guide cover was 3.7 m, and the size was such that it encloses the whole of the hollow fiber membrane, the upper holding member and the lower holding member in the vertical direction.
- the filtration process uses an intermittent bubble jet diffuser (intermittent pump), intermittently supplies bubbles at a supply rate of 50 L / min so that the bubbles are divided by the lower holding member, and operates for 9 minutes. Repeatedly paused for a minute. The result is shown in FIG.
- Example 2 Except for a configuration in which water is collected from both ends of the hollow fiber membrane by fixing both ends of a plurality of hollow fiber membranes with an upper holding member and a lower holding member, and connecting a discharge pipe to both the upper holding member and the lower holding member.
- the intermittent pumps are arranged in pairs (two) so as to sandwich the lower holding member at the center of gravity of the side surface of the lower holding member so that the air bubbles are divided not by the lower holding member but by a plurality of hollow fiber membranes. did. The result is shown in FIG.
- Example 1 A filtration treatment was performed under the same conditions as in Example 1 except that bubbles that were not divided by the lower holding member were continuously supplied at the same supply rate as in Example 1 by a diffuser using a perforated tube. The change in pressure was measured. The result is shown in FIG.
- the filtration device of Example 1 is more than the filtration device of Comparative Example 1 because the bubbles divided by the lower holding member spread uniformly between the hollow fiber membranes.
- the differential pressure can be significantly reduced.
- the filtration module is made into a both-ends water collection type as shown in FIG. 7, the same effect as a one-side water collection type is acquired.
- the filtration device and the immersion filtration method of the present invention are excellent in the cleaning ability of the surface of the hollow fiber membrane and can maintain a high filtration ability. Therefore, the said filtration apparatus can be used suitably in various fields as a solid-liquid separation processing apparatus.
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Abstract
Description
そこで、濾過モジュールの下方から気泡を送り、各中空糸膜の表面を擦過し、さらに各中空糸膜を振動させて付着物を除去する洗浄方法(エアースクラビング)が従来から用いられている(特開2010-42329号公報参照)。
一方向に引き揃えられた状態で保持される複数本の中空糸膜を有する濾過モジュールと、この濾過モジュールの下方から気泡を供給する気体供給器とを備える浸漬式の濾過装置であって、
上記気体供給器から供給される気泡が、濾過モジュールに衝突後複数の気泡に分割される濾過装置である。
当該濾過装置を用いた浸漬式濾過方法である。
本願発明は、
一方向に引き揃えられた状態で保持される複数本の中空糸膜を有する濾過モジュールと、この濾過モジュールの下方から気泡を供給する気体供給器とを備える浸漬式の濾過装置であって、
上記気体供給器から供給される気泡が、濾過モジュールに衝突後複数の気泡に分割される濾過装置である。
以下、本発明に係る濾過装置の実施形態について図面を参照しつつ詳説する。
図1の濾過装置1は、濾過モジュール2、及びこの濾過モジュール2の下方から気泡を供給する気体供給器3を備え、被処理液を貯留した濾過槽Xに浸漬されて使用される。
濾過モジュール2は、上下方向に引き揃えられた複数本の中空糸膜4と、この複数本の中空糸膜4を上下方向に位置決めする上部保持部材5及び下部保持部材6とを有する。
中空糸膜4は、内側の中空部に水を透過させる一方、被処理液に含まれる粒子の透過を阻止する多孔質状の中空糸膜である。
上記微細な凹凸はチューブ外周面全体に形成されることが好ましいが、部分的又は断続的に形成されていてもよい。また、上記微細な凹凸をチューブ外周面に形成する方法としては、例えば火炎による表面処理、レーザー照射、プラズマ照射、フッ素系樹脂等のディスパージョン塗布等を挙げることができるが、チューブ性状に影響を与えず容易に凹凸を形成できる火炎による表面処理が好ましい。
中空糸膜4の平均外径に対する平均内径の比が上記下限未満の場合、中空糸膜4の厚さが必要以上に大きくなって中空糸膜4の透水性が低下するおそれがある。
上部保持部材5は、複数本の中空糸膜4の上端部を保持する部材であり、複数本の中空糸膜4の上部開口と連通し、濾過済液を収集する排出部(集水ヘッダ)を有する。この排出部には排出管7が接続され、複数本の中空糸膜4の内部に浸透した濾過済液を排出する。上部保持部材5の外形は特に限定されず、断面形状は多角形状、円形状等とすることができる。
気体供給器3は、上記濾過モジュール2の下方から、中空糸膜4の表面を洗浄する気泡Bを供給する。この気泡Bは、上述のとおり、上記固定部位6bで複数の気泡B’に分割され、中空糸膜4の表面を擦過することで洗浄を行う。この気体供給器3は、1つの気泡吐出口を有する。つまり、当該濾過装置1は、1つの濾過モジュール2に1対1で対応する気泡吐出口を有する。
当該濾過装置1は、濾過を行う被処理液を貯留した濾過槽内に浸漬して用いることができる。当該濾過装置1の具体的な用途としては、例えば下排水処理、産業排水処理、工業用水道水濾過、機械等の洗浄水処理、プール水濾過、河川水濾過、海水濾過、醗酵プロセスの除菌又は除濁(酵素又はアミノ酸精製)、食品、酒、ビール、ワインなどの濾過(特に生製品)、製薬等におけるファーメンターからの菌体分離、染色工業における用水及び溶解染料の濾過、動物細胞の培養濾過、RO膜における純水製造プロセス(海水の淡水化を含む)における前処理濾過、イオン交換膜を用いたプロセスにおける前処理濾過、イオン交換樹脂を用いた純水製造プロセスにおける前処理濾過等が挙げられる。
当該濾過装置1は、気体供給器3から供給される気泡Bの平均水平径が複数本の中空糸膜4の固定部分の最大間隔より大きいため、この気泡Bが固定部位6bによって複数の気泡B’に分割され、中空糸膜4表面に接触しながら上昇する。この分割された気泡B’は、中空糸膜4の間隔に近い平均径を有し中空糸膜4間に均質に拡がり易い。そのため、この分割気泡B’によって中空糸膜4表面をもれなく洗浄することができる。また、上記分割気泡B’は従来の微小な気泡よりも上昇速度が大きいため、高い擦過圧力で効果的に中空糸膜4表面を洗浄することができる。また、当該濾過装置1は、分割気泡B’が各中空糸膜4の長手方向に沿って上昇するため、中空糸膜4表面の洗浄をより効率的かつ効果的に行うことができる。
当該濾過装置1を用いた浸漬式濾過方法は、上述のように当該濾過装置1の中空糸膜4の表面が気泡により清浄に保たれるため、高い濾過効率を継続しながら濾過処理を行うことができる。
図3a、3bの濾過装置11は、濾過モジュール2、この濾過モジュール2の下方から気泡を供給する気体供給器3、及び上記濾過モジュール2の複数の中空糸膜4を囲繞するガイドカバー8を備え、被処理液を貯留した濾過槽Xに浸漬されて使用される。濾過モジュール2及び気体供給器3は、上記第一実施形態の濾過装置1と同様であるため、同一符号を付して説明を省略する。
ガイドカバー8は、濾過モジュール2の複数の中空糸膜4の周囲を囲繞する筒状体である。ガイドカバー8は、濾過モジュール2の上方において洗浄用の気泡B’が分散しないよう少なくとも中空糸膜4の上方部分を囲繞する。
つまり、ガイドカバー8が上部保持部材5を囲繞せずに、両者の間に空間が形成されるようにすることが好ましい。このようにガイドカバー8と上部保持部材5とを離間することで、気泡によって中空糸膜4から分離した不純物(し渣)をガイドカバー8と上部保持部材5間の空間から濾過モジュール2外部へ排出することができ、洗浄効果を向上することができる。一方で、ガイドカバー8は下部保持部材6の一部を囲繞することが好ましい。
一方、上記平均距離D1の上限としては、400mmが好ましく、250mmがより好ましく、100mmがさらに好ましい。上記平均距離D1が上記上限を超える場合、気泡の分散防止効果が不十分となるおそれがある。逆に、上記平均距離D1が上記下限未満の場合、中空糸膜4とガイドカバー8とが接触し、中空糸膜4の洗浄及び揺動が不十分となるおそれや、中空糸膜4の表面が損耗するおそれがある。
当該濾過装置11は、濾過モジュール2の中空糸膜4を囲繞するガイドカバー8を備えることで、洗浄用の気泡B’が上昇に伴って分散することを防止すると共に気泡B’の上昇速度を向上させることができる。そのため、当該濾過装置11は、中空糸膜4の表面洗浄効率及び揺動効果に特に優れる。
今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記実施形態の構成に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内での全ての変更が含まれることが意図される。
図3a、3bに示す濾過モジュールと気体供給器とガイドカバーとを備える濾過装置を用いて、処理速度0.7m3/m2・dayで被処理液(汚泥水)を濾過処理した際の中空糸膜の内外の差圧の変化を計測した。なお、中空糸膜の平均長さは3.2m、平均外径は2.3mm、平均内径は1.1mm、本数は740本とした。また、ガイドカバーの長さは3.7mとし、中空糸膜、上部保持部材及び下部保持部材の上下方向全体を囲繞する大きさとした。さらに、濾過処理は、間欠気泡噴射式散気装置(間欠ポンプ)を用い、下部保持部材で気泡が分割されるように50L/minの供給量で気泡を間欠供給し、9分間の運転と1分間の休止とを繰り返して行った。この結果を図6に示す。
複数の中空糸膜の両端を上部保持部材及び下部保持部材でそれぞれ固定し、上部保持部材及び下部保持部材の両方に排出管を接続することで中空糸膜の両端から集水する構成とした以外は実施例1と同様とした濾過モジュールを用いて、実施例1と同じ供給量で気泡を間欠供給し、中空糸膜の内外の差圧の変化を計測した。なお、間欠ポンプは下部保持部材の側面の重心対称位置に下部保持部材を挟持するよう1対(2個)配設し、気泡が下部保持部材ではなく複数の中空糸膜で分割されるようにした。この結果を図7に示す。
多孔管を用いた散気装置によって下部保持部材で分割されない気泡を実施例1と同じ供給量で連続供給した以外は実施例1と同様の条件で濾過処理を行い、中空糸膜の内外の差圧の変化を計測した。この結果を図8に示す。
2 濾過モジュール
3 気体供給器
4 中空糸膜
5 上部保持部材
6、16 下部保持部材
6a 外枠
6b、16b 固定部位
7 排出管
8 ガイドカバー
Claims (5)
- 一方向に引き揃えられた状態で保持される複数本の中空糸膜を有する濾過モジュールと、この濾過モジュールの下方から気泡を供給する気体供給器とを備える浸漬式の濾過装置であって、
上記気体供給器から供給される気泡が、濾過モジュールに衝突後複数の気泡に分割される濾過装置。 - 上記気体供給器から供給される気泡の平均水平径が上記濾過モジュールの複数本の中空糸膜の保持部分の最大間隔より大きい請求項1に記載の濾過装置。
- 上記濾過モジュールが、複数本の中空糸膜を上下方向に位置決めする上部保持部材及び下部保持部材を有し、
この上部保持部材が、複数本の中空糸膜の上部開口と連通し、濾過済液を収集する排出口を有し、
上記気体供給器が、上記下部保持部材の下方に位置する請求項1又は請求項2に記載の濾過装置。 - 上記複数の中空糸膜の少なくとも上方を囲繞するガイドカバーをさらに備える請求項3に記載の濾過装置。
- 請求項1に記載の濾過装置を用いた浸漬式濾過方法。
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CA2913727A CA2913727A1 (en) | 2013-05-30 | 2014-04-09 | Filtration apparatus and immersion-type filtration method using the apparatus |
SG11201509263QA SG11201509263QA (en) | 2013-05-30 | 2014-04-09 | Filtration apparatus and immersion-type filtration method using the apparatus |
US14/893,600 US20160121270A1 (en) | 2013-05-30 | 2014-04-09 | Filtration apparatus and immersion-type filtration method using the apparatus |
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US20190039025A1 (en) * | 2015-10-08 | 2019-02-07 | Sumitomo Electric Industries, Ltd. | Filter unit |
CN105771664A (zh) * | 2016-03-09 | 2016-07-20 | 浙江东大环境工程有限公司 | 一种帘式中空纤维膜过滤装置 |
KR101764062B1 (ko) | 2016-07-22 | 2017-08-01 | 롯데케미칼 주식회사 | 침지식 분리막 모듈 및 이를 포함하는 수처리 장치 |
JP6583447B2 (ja) | 2018-02-20 | 2019-10-02 | 株式会社明電舎 | 気泡発生装置 |
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JP2003340250A (ja) * | 2002-05-27 | 2003-12-02 | Kurita Water Ind Ltd | 膜分離装置 |
JP2007209949A (ja) * | 2006-02-13 | 2007-08-23 | Mitsubishi Rayon Eng Co Ltd | 固液混合処理液のろ過液回収装置 |
WO2008001730A1 (fr) * | 2006-06-26 | 2008-01-03 | Sumitomo Electric Fine Polymer, Inc. | Appareil de filtration |
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JP2003340250A (ja) * | 2002-05-27 | 2003-12-02 | Kurita Water Ind Ltd | 膜分離装置 |
JP2007209949A (ja) * | 2006-02-13 | 2007-08-23 | Mitsubishi Rayon Eng Co Ltd | 固液混合処理液のろ過液回収装置 |
WO2008001730A1 (fr) * | 2006-06-26 | 2008-01-03 | Sumitomo Electric Fine Polymer, Inc. | Appareil de filtration |
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