WO2005110584A1 - ろ過膜の逆洗方法および逆洗装置 - Google Patents
ろ過膜の逆洗方法および逆洗装置 Download PDFInfo
- Publication number
- WO2005110584A1 WO2005110584A1 PCT/JP2005/008765 JP2005008765W WO2005110584A1 WO 2005110584 A1 WO2005110584 A1 WO 2005110584A1 JP 2005008765 W JP2005008765 W JP 2005008765W WO 2005110584 A1 WO2005110584 A1 WO 2005110584A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- filtration
- membrane
- backwashing
- water
- air
- Prior art date
Links
- 238000001914 filtration Methods 0.000 title claims abstract description 94
- 239000012528 membrane Substances 0.000 title claims abstract description 46
- 238000011001 backwashing Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 88
- 238000000926 separation method Methods 0.000 claims abstract description 22
- 238000005374 membrane filtration Methods 0.000 claims abstract description 18
- 239000000919 ceramic Substances 0.000 claims abstract description 11
- 239000010410 layer Substances 0.000 claims description 42
- 230000000717 retained effect Effects 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 8
- 239000000758 substrate Substances 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 abstract 1
- 238000007796 conventional method Methods 0.000 abstract 1
- 230000003028 elevating effect Effects 0.000 abstract 1
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 239000002351 wastewater Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 4
- 238000005187 foaming Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011362 coarse particle Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000005056 compaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009295 crossflow filtration Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- DMYHGDXADUDKCQ-UHFFFAOYSA-N fenazaquin Chemical compound C1=CC(C(C)(C)C)=CC=C1CCOC1=NC=NC2=CC=CC=C12 DMYHGDXADUDKCQ-UHFFFAOYSA-N 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
Classifications
-
- 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
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/06—Tubular membrane modules
- B01D63/066—Tubular membrane modules with a porous block having membrane coated passages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/02—Inorganic material
-
- 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
- B01D2321/04—Backflushing
-
- 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
Definitions
- the present invention relates to a method and an apparatus for backwashing a filtration membrane.
- a membrane filtration device in which a filtration membrane element 1 in which a number of filtration channels 12 are arranged in parallel in a porous portion 11 as illustrated in Fig. 2 is disposed in a casing 13 as shown in Fig. 4
- raw water a is introduced into the primary inlet chamber 13a, passed through the filtration channel 12, circulated through the primary outlet chamber 13b and the upper header pipe 17, and returned as raw water b.
- a cross-flow filtration method that filters through the fine filtration holes in section 11 and removes it from the filtered water header tube 14 or a valve that fills the primary side and closes the valve at the top of the casing to force the raw water that has been introduced into the filtered water header tube 14
- the filtration water c is removed through a secondary chamber 13c between the side surface of the casing 13 and the side surface of the filtration element 1 by a dead-end filtration system obtained as a total amount of filtered water.
- the filtered water c itself is usually used as the backwash water f.
- the amount of dirty backwash wastewater e increases, while the amount of filtered water c increases.
- Patent Documents 1 and 2 a method of back-flush by supplying high-pressure air instead of using filtered water c as back-flush water f has been proposed.
- a pipe for flowing backwash drainage is directly connected to a lower part of a casing containing the filtration membrane element 1 as a lower header pipe 15. Therefore, it was necessary to increase the diameter of the lower header pipe 15 and the backwash drain valve 16 in order to quickly flow backwash drainage flowing from a plurality of elements.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-126468: Claim 1, Paragraph (0010)
- Patent Document 2 Japanese Patent Application Laid-Open No. 2002-35748: Claim 2, paragraph (0007)
- the present invention solves the above-mentioned conventional problems, and allows the diameter of the backwash drain pipe to be designed to be small without lowering the backwash effect, thereby reducing the size of the equipment and the degree of freedom of the equipment.
- An object of the present invention is to provide a method and an apparatus for backwashing a filtration membrane which can be increased.
- the method for backwashing a filtration membrane of the present invention which has been made to solve the above-mentioned problem, supplies air whose pressure is controlled to the secondary side of the filtration membrane which has been clogged by an obstruction.
- the air pressure is increased and the water inside the filtration membrane is pushed out to the primary side together with air to remove the clogged material. It is.
- the membrane filtration device is one in which a ceramic filtration membrane including a base layer having countless filtration holes and a separation layer having filtration holes finer than the base layer is housed in a casing.
- the step of pushing out the retained water up to the boundary surface between the surface layer of the ceramic filtration membrane and the separation layer with the separation layer to the primary side. can be included.
- the water remaining in the filtration element can be replaced with washing water containing a washing chemical.
- a backwashing device of the present invention made to solve the above-mentioned problem is provided by a backwashing device for a membrane filtering device in which a filtration element formed of a ceramic filtration membrane having countless filtration holes is housed in a casing.
- This is a backwashing device that is located below the filtered water piping that also serves as the backwash air supply pipe.
- a feature is that a filtered water header pipe is arranged, and a backwash air supply source capable of pressure control is provided at the tip of the backwash air supply pipe.
- air is supplied while controlling the pressure from the secondary side of the filtration membrane clogged by the obstruction to replace the air with the water remaining in the filtration membrane.
- the remaining filtered water in the membrane filtration device is gradually drained to the primary side, drainage can be performed without increasing the diameter of the piping for backwash drainage.
- the air pressure is increased to push the water inside the filtration membrane to the primary side together with the air, and the clogging material is peeled off.
- the amount of backwash wastewater at that time is relatively small. Drainage is possible without increasing the diameter. For this reason, the diameter of the lower header tube and the like can be designed to be small without lowering the backwash effect, whereby the equipment can be made compact and the degree of freedom of the equipment can be increased.
- the backwashing device of the present invention is one in which a filtered water header pipe is disposed below the filtered water pipe also serving as a backwash air supply pipe. For this reason, the backwashing of the present invention described above can be performed, of course. There is an advantage that the recovery rate represented by the ratio is improved.
- FIG. 1 is a schematic diagram of a membrane filtration device.
- FIG. 2 is a perspective view showing a filtration membrane element.
- FIG. 3 is a schematic cross-sectional view of a filtration membrane illustrating a backwashing method of the present invention.
- FIG. 4 is a schematic view of a conventional filtration device.
- FIG. 5 is a schematic view of a conventional actual facility provided with many elements.
- the membrane filtration device to which the present invention can be applied is basically the same as that described above. That is, as shown in FIG. 2, a filtration membrane element 1 in which a large number of filtration channels 12 are arranged in parallel with a porous portion 11 is disposed in a casing 2. The upper and lower outer peripheries of the filtration membrane element 1 are sealed by packing 2d, and the upper and lower end faces of the filtration membrane element 1 itself are also sealed, so that raw water and filtered water are not mixed.
- the raw water a is introduced into the primary inlet chamber 2a, and is circulated as the raw water b returned via the filtration channel 12, the primary outlet chamber 2b, and the upper header tube 24, or in the middle of the primary outlet chamber 2b. Filtration is carried out by a total filtration method in which the arranged valve X is closed.
- the raw water a is filtered by a separation layer having fine filtration holes formed on the inner surface of the filtration channel 12, and the filtered water c is filtered through the secondary chamber 2c between the side of the casing 2 and the side of the filtration element 1. It is taken out from the water pipe 22 to the filtered water header pipe 21.
- the feature of the present invention is that when the filtration operation in such a membrane filtration device proceeds and the filtration membrane is clogged with an obstruction, 1) secondary filtration of the filtration membrane is performed. Supply air while controlling the pressure from the side, 2) Drain the remaining filtered water in the membrane filtration device to the primary side with pressurized air, 3) Increase the air pressure to primary the water inside the filtration membrane with air The point is to perform the backwashing operation of extruding to the side and peeling off the obstruction. It is also possible to replace the water remaining in the filtration element with cleaning water containing cleaning chemicals before the backwashing operation.
- the structure of the filtration membrane is composed of countless ceramic coarse particles ly, as schematically shown in Fig. 3 (A).
- a base layer having a myriad of filtration holes, 1 lb, and a separation layer 1 la composed of 1 lx of ceramic fine particles on the primary side (the filtration channel 12 side) and having finer filtration holes than the base layer 1 lb. are targeted.
- a separation layer l la when backwashing a membrane filtration device in which such a filtration element 1 is disposed in a casing 2, as shown in FIG. 3A, a separation layer l la, a base layer l lb, When the secondary chamber 2c is full of filtered water, drain water to the secondary chamber 2c between the filtration element 1 and the casing 2.
- Pressure through filtered water pipe 22 which also serves as air supply pipe and backwash air supply pipe Supply controlled air g.
- air g having a pressure pi lower than the foaming pressure of the base layer l ib is sent to the secondary side chamber 2c.
- the inside of the secondary chamber 2c is replaced with air, and the filtered water is pushed out to the primary side (raw water side) and drained.
- the retained filtered water in the membrane filtration device can be gradually discharged to the primary side.
- the present invention can further include the following step 2. That is, in step 2, after the secondary room filtered water is pushed out by the air at the pressure pi, the air g controlled at the higher pressure p2 is supplied, and as shown in FIG. The water remaining in the ib (up to the interface between the base layer l ib and the separation layer 11a) is replaced with air and gradually discharged to the primary side.
- the pressure p2 is higher than the pressure pi used in step 1. That is, p2 is set to a pressure higher than the foaming pressure of the base layer 1 lb and lower than the foaming pressure of the separation layer 1 la.
- p2 is set to a pressure higher than the foaming pressure of the base layer 1 lb and lower than the foaming pressure of the separation layer 1 la.
- the pressure p3 is higher than the foaming pressure of the separation layer 11a.
- the pressurized air pushes the stagnant water in the separation layer 11a into the filtration channel 12 and separates sediment as jet air, thereby eliminating clogging of the filtration membrane. Since the retained water in the filtration membrane that is pushed into the filtration channel 12 in this step 3 is only about 2.5% of the casing volume (see below), the lower header pipe 25 through which the backwash drainage flows has a large diameter. Even without this, drainage at a high flow rate is possible and a sufficient cleaning effect can be obtained.
- step 1 the force required to push out the occlusion by the force of backflow of water.
- step 3 the process directly proceeds from step 1 to step 3 to achieve the case 2
- About 24% of the volume of water the amount of water retained in the base layer lib and in the separation layer 11a, see below
- effective membrane cleaning can be performed.
- the filtered water header pipe 14 is arranged above the filtered water pipe 15 which also serves as a backwash air supply pipe. This is because the pressure of water is used for backwashing, and if air remains in the flow path, the backwashing pressure is lost due to the compression of the residual air, causing a significant decrease in backwashing efficiency. This is because it is necessary to completely remove the air in the filtered water pipe 15 by installing the filtered water header pipe 14 above the filtered water pipe 15.
- the filtered water header pipe 21 is disposed below the filtered water pipe 22 which also serves as the backwash air supply pipe.
- the retained filtered water in the filtered water header pipe 14 flows backward at the time of backwashing, whereas the present invention includes a step of replacing the inside of the filtered water pipe with air prior to backwashing, so that residual air Has no effect on the backwashing effect. Therefore, the filtered water header pipe 21 can be installed downward, and even if air g is supplied from the backwash air supply source 23, the filtered water in the filtered water header pipe 21 does not flow backward, so that the amount of backwash drainage is small. Become.
- a filtration membrane element 1 with a diameter of 180 mm and a length of 1000 mm and inside it with 2000 filtration channels (cells) with an inner diameter of 2.5 mm is housed in a casing 2 with a diameter of 200 mm
- the internal volume of the casing is 100%
- the volume of the secondary chamber 2c is 21%
- the volume of the filtration element 1 is 48%
- the filtration channel is 31%.
- the filter layer element 1 has a base layer: separation layer ratio of 9: 1 and a porosity of 50% for the base layer and the separation layer
- the amounts of filtered water retained in the base layer and the separation layer are 21% and 2%, respectively. . 5%.
- the membrane used here had a base layer with a pore diameter of about 10 m, and a separation layer with a pore diameter of 1 ⁇ m.
- the force pi was set at 10 kPa
- p2 was set at 50 kPa
- p3 was set at 300 kPa.
- the three-step backwash was implemented without any problems.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/568,238 US8641904B2 (en) | 2004-05-13 | 2005-05-13 | Method for membrane backwashing and backwashing apparatus |
JP2006513563A JP4841430B2 (ja) | 2004-05-13 | 2005-05-13 | ろ過膜の逆洗方法 |
EP05739207.8A EP1745837B1 (en) | 2004-05-13 | 2005-05-13 | Back washing method of filtration membrane |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-143899 | 2004-05-13 | ||
JP2004143899 | 2004-05-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005110584A1 true WO2005110584A1 (ja) | 2005-11-24 |
Family
ID=35394016
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/008765 WO2005110584A1 (ja) | 2004-05-13 | 2005-05-13 | ろ過膜の逆洗方法および逆洗装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US8641904B2 (ja) |
EP (1) | EP1745837B1 (ja) |
JP (1) | JP4841430B2 (ja) |
WO (1) | WO2005110584A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010227851A (ja) * | 2009-03-27 | 2010-10-14 | Metawater Co Ltd | 膜ろ過システムおよびその洗浄方法 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100962556B1 (ko) | 2008-08-13 | 2010-06-11 | (주)피지티 | 하향류식 고속 정밀 여과장치 |
WO2011099656A1 (ko) * | 2010-02-10 | 2011-08-18 | (주)피지티 | 하향류식 고속 정밀 여과장치 |
US8889001B2 (en) * | 2010-03-09 | 2014-11-18 | Memprotec Inc. | Reverse osmosis for maple tree sap |
CN202191761U (zh) * | 2011-08-26 | 2012-04-18 | 三一重型装备有限公司 | 一种反冲洗过滤装置 |
US11524263B1 (en) | 2019-08-15 | 2022-12-13 | Wigen Companies, Inc. | Filtration processes and systems |
CN117886484B (zh) * | 2024-03-13 | 2024-05-31 | 国检测试控股集团湖南华科科技有限公司 | 一种高氯酸盐废水高效处理设备及工艺 |
Citations (8)
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JPS51103661A (en) | 1975-03-10 | 1976-09-13 | Giken Kogyo Kk | Shintosayooryoshita osuishorisochi |
WO1993002779A1 (en) | 1991-08-07 | 1993-02-18 | Memtec Limited | Concentration of solids in a suspension using hollow fibre membranes |
JPH0751548A (ja) | 1992-09-11 | 1995-02-28 | Ngk Insulators Ltd | セラミック膜の逆洗方法 |
JPH0768139A (ja) | 1993-09-06 | 1995-03-14 | Nippon Memtec Kk | 中空糸膜モジュールの逆洗方法 |
JPH11128700A (ja) | 1997-10-23 | 1999-05-18 | Daicel Chem Ind Ltd | 分離膜の薬洗液 |
JP2000033238A (ja) | 1998-07-16 | 2000-02-02 | Ngk Insulators Ltd | 膜面に形成されたファウリング層の除去方法 |
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JP2002126468A (ja) | 2000-10-18 | 2002-05-08 | Maezawa Ind Inc | 膜モジュールの洗浄方法及び膜ろ過装置 |
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US4874516A (en) * | 1984-12-29 | 1989-10-17 | Ngk Insulators, Ltd. | A ceramic filter for semi-ultrafiltration |
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ES2014516A6 (es) * | 1986-07-11 | 1990-07-16 | Mentec Ltd | Procedimiento para la limpieza de filtros. |
US5244585A (en) * | 1991-01-11 | 1993-09-14 | Akitoshi Sugimoto | Method of cleaning porous ceramic filters |
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JPH07313850A (ja) * | 1994-05-30 | 1995-12-05 | Kubota Corp | 浸漬型セラミック膜分離装置の逆洗方法 |
AU7607800A (en) * | 1999-09-22 | 2001-04-24 | Advanced Renal Technologies | High citrate dialysate and uses thereof |
JP2002282629A (ja) * | 2001-03-27 | 2002-10-02 | Ngk Insulators Ltd | 複層構造セラミックフィルターの製造方法 |
JP4917234B2 (ja) * | 2001-12-07 | 2012-04-18 | 日本碍子株式会社 | セラミックフィルター及び浄水方法 |
JP4195824B2 (ja) * | 2003-03-10 | 2008-12-17 | メタウォーター株式会社 | ろ過方法 |
-
2005
- 2005-05-13 US US11/568,238 patent/US8641904B2/en active Active
- 2005-05-13 WO PCT/JP2005/008765 patent/WO2005110584A1/ja active Application Filing
- 2005-05-13 EP EP05739207.8A patent/EP1745837B1/en active Active
- 2005-05-13 JP JP2006513563A patent/JP4841430B2/ja active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51103661A (en) | 1975-03-10 | 1976-09-13 | Giken Kogyo Kk | Shintosayooryoshita osuishorisochi |
WO1993002779A1 (en) | 1991-08-07 | 1993-02-18 | Memtec Limited | Concentration of solids in a suspension using hollow fibre membranes |
JPH0751548A (ja) | 1992-09-11 | 1995-02-28 | Ngk Insulators Ltd | セラミック膜の逆洗方法 |
JPH0768139A (ja) | 1993-09-06 | 1995-03-14 | Nippon Memtec Kk | 中空糸膜モジュールの逆洗方法 |
JPH11128700A (ja) | 1997-10-23 | 1999-05-18 | Daicel Chem Ind Ltd | 分離膜の薬洗液 |
JP2000033238A (ja) | 1998-07-16 | 2000-02-02 | Ngk Insulators Ltd | 膜面に形成されたファウリング層の除去方法 |
JP2002035748A (ja) | 2000-07-26 | 2002-02-05 | Suido Kiko Kaisha Ltd | 大孔径ろ過膜体を用いた浄水処理装置 |
JP2002126468A (ja) | 2000-10-18 | 2002-05-08 | Maezawa Ind Inc | 膜モジュールの洗浄方法及び膜ろ過装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010227851A (ja) * | 2009-03-27 | 2010-10-14 | Metawater Co Ltd | 膜ろ過システムおよびその洗浄方法 |
Also Published As
Publication number | Publication date |
---|---|
US20070210001A1 (en) | 2007-09-13 |
EP1745837B1 (en) | 2014-07-09 |
JP4841430B2 (ja) | 2011-12-21 |
EP1745837A1 (en) | 2007-01-24 |
EP1745837A4 (en) | 2008-11-26 |
JPWO2005110584A1 (ja) | 2008-03-21 |
US8641904B2 (en) | 2014-02-04 |
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