JPH05184884A - Method for backwashing hollow fiber membrane module - Google Patents
Method for backwashing hollow fiber membrane moduleInfo
- Publication number
- JPH05184884A JPH05184884A JP172592A JP172592A JPH05184884A JP H05184884 A JPH05184884 A JP H05184884A JP 172592 A JP172592 A JP 172592A JP 172592 A JP172592 A JP 172592A JP H05184884 A JPH05184884 A JP H05184884A
- Authority
- JP
- Japan
- Prior art keywords
- hollow fiber
- water
- hollow
- backwashing
- filtration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、多孔質中空糸をイント
ゥーアウト方式で濾過膜として使用する中空糸濾過モジ
ュールの逆洗方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of backwashing a hollow fiber filtration module which uses a porous hollow fiber as a filtration membrane in an in-out system.
【０００２】[0002]
【従来の技術】中空糸濾過膜は、優れた濾過機能を有
し、かつ単位容積内に収納できる濾過膜の膜面積が大き
いため、従来より高純度の飲料水、医療用の無菌水等を
始めとして種々の用途に広く用いられている。2. Description of the Related Art Hollow fiber filtration membranes have an excellent filtration function, and since the membrane area of the filtration membrane which can be stored in a unit volume is large, drinking water of higher purity than conventional, sterile water for medical use, etc. Firstly, it is widely used for various purposes.
【０００３】このような中空糸膜を有する中空糸濾過モ
ジュールの使用方法としては、中空糸の中空部から外側
へ向けて濾過する方式（イントゥーアウト方式）と、中
空糸の外側から中空部へ向けて濾過する方式（アウトト
ゥーイン方式）との二通りがある。しかし、イントゥー
アウト方式では中空糸内部の被処理水の通過抵抗が大き
く、また、被処理水中の汚濁物質等が中空糸の中空部に
残存して目詰まりを起すため、その濾過機能の回復処理
が困難であり、各種の用水処理にはアウトトゥーイン方
式が多く用いられてきた。As a method of using the hollow fiber filtration module having such a hollow fiber membrane, there is a method of filtering from the hollow portion of the hollow fiber to the outside (into-out method), and from the outside of the hollow fiber to the hollow portion. There are two ways to filter towards (out to in). However, in the in-out method, the passage resistance of the water to be treated inside the hollow fiber is large, and contaminants etc. in the water to be treated remain in the hollow part of the hollow fiber and cause clogging, so that the recovery of its filtering function is achieved. The treatment is difficult and the out-to-in system has been often used for various water treatments.
【０００４】しかしながら、被処理水中の汚濁物質が比
較的高濃度で含まれる場合には、アウトトゥーイン方式
の濾過処理では、中空糸の外表面に付着した汚濁物質同
士が凝集することにより、中空糸束が一本に固着した状
態になりやすく、この現象に基づき有効濾過膜面積も急
速に低下しやすいという問題点があった。中空糸濾過モ
ジュールの機能回復処理方法として種々の方法が知られ
ているが、中空糸束が一本に固着した状態から十分な機
能回復処理を行なうのは比較的困難であった。そこで、
中空糸束が一本に固着した状態になることがないという
観点から、再びイントゥーアウト方式による濾過が注目
されている。However, when the pollutants in the water to be treated are contained at a relatively high concentration, the out-to-in filtration process causes the pollutants adhering to the outer surface of the hollow fibers to aggregate, resulting in a hollow structure. There is a problem in that the yarn bundle tends to be stuck to one and the effective filtration membrane area tends to decrease rapidly based on this phenomenon. Although various methods are known as a method for recovering the function of a hollow fiber filtration module, it has been relatively difficult to perform a sufficient function recovery process from a state in which a bundle of hollow fibers is fixed. Therefore,
From the viewpoint that the hollow fiber bundles are not stuck in one bundle, the filtration by the into-out method is receiving attention again.
【０００５】中空糸濾過モジュールの濾過機能の回復処
理に際して、モジュールを濾過装置から取り外して実施
する方法は、操作が面倒であり、濾過装置の稼動効率を
低下させるため好ましい方法とはいえない。モジュール
を濾過装置に取り付けたままの状態で機能回復処理を実
施することが好ましく、その具体的方法としては、濾過
時とは逆向きに水流を流すいわゆる逆洗法が一般的であ
る。しかし、イントゥーアウト方式の濾過に使用した中
空糸濾過モジュールの逆洗法による機能回復処理では、
ある程度中空糸の細孔の洗浄が進められて洗浄用水の流
量が確保されると、透過性のよい細孔のみに洗浄用水の
流れが集中し、残りの目詰りした細孔には余り洗浄水圧
が加わらないため、もはやその機能回復処理が行なわれ
ず、中空糸濾過モジュール全体としての濾過流量の回復
には限界があった。In the process of recovering the filtering function of the hollow fiber filtration module, the method of removing the module from the filtration device is not a preferable method because the operation is troublesome and the operation efficiency of the filtration device is reduced. It is preferable to carry out the function recovery treatment while the module is still attached to the filtration device, and as a concrete method therefor, a so-called backwashing method in which a water stream is caused to flow in the opposite direction to the filtration is generally used. However, in the function recovery treatment by the backwash method of the hollow fiber filtration module used for the filtration of the into-out method,
When the washing of the hollow fiber pores is promoted to a certain degree and the flow rate of the washing water is secured, the flow of washing water concentrates only on the pores with good permeability, and the remaining washing water pressure is applied to the remaining clogged pores. Therefore, the function recovery process is no longer performed, and there is a limit to the recovery of the filtration flow rate of the hollow fiber filtration module as a whole.
【０００６】[0006]
【発明が解決しようとする課題】本発明者らはかかる問
題点解決する中空糸濾過モジュールの機能回復処理方法
につき鋭意検討した結果、中空糸の外側に存する洗浄水
の液面を徐々に下げつつ逆洗することで、大幅な濾過機
能の回復が達成できることを見い出し、本発明を完成す
るに至った。DISCLOSURE OF THE INVENTION The inventors of the present invention have diligently studied a function recovery treatment method of a hollow fiber filtration module which solves the above problems, and as a result, gradually lower the liquid level of washing water existing outside the hollow fiber. It was found that a large amount of recovery of the filtering function can be achieved by backwashing, and the present invention has been completed.
【０００７】[0007]
【課題を解決するための手段】すなわち、本発明は、固
定部材によりその開口端を集束固定した多数の多孔質中
空糸を具備し、被処理水を該中空糸の中空部側から供給
し、浄化水を該中空糸の外側から回収する中空糸濾過モ
ジュールの濾過機能の回復のための逆洗方法において、
中空糸の外側から中空糸の中空部に向けて洗浄水を流す
に際して、洗浄水流水開始時には該モジュール中の全中
空糸が洗浄水に接する状態とし、洗浄水流水停止時には
中空糸の開口端の最遠部のみが洗浄水に接する状態とな
るように、中空糸の外側に存する洗浄水の液面を徐々に
下げつつ実施する過程を有することを特徴とする中空糸
濾過モジュールの逆洗方法である。That is, the present invention comprises a large number of porous hollow fibers whose open ends are converged and fixed by a fixing member, and water to be treated is supplied from the hollow portion side of the hollow fibers, In a backwashing method for recovering the filtering function of a hollow fiber filtration module for collecting purified water from the outside of the hollow fiber,
When flushing water from the outside of the hollow fiber toward the hollow part of the hollow fiber, all the hollow fibers in the module are in contact with the flush water at the start of flushing water, and when the flushing water is stopped, the open end of the hollow fiber A method of backwashing a hollow fiber filtration module, characterized by having a step of gradually lowering the liquid level of the wash water existing on the outside of the hollow fiber so that only the farthest part comes into contact with the wash water. is there.
【０００８】[0008]
【作用】本発明の洗浄方法が適用できる中空糸濾過モジ
ュールは、中空糸濾過膜が多孔質中空糸からなるもので
あって、被処理水を、前述したイントゥーアウト方式で
濾過膜として使用することができる構造を有するもので
あれば、各種の構造のものが適用できる。In the hollow fiber filtration module to which the cleaning method of the present invention can be applied, the hollow fiber filtration membrane is made of porous hollow fiber, and the water to be treated is used as the filtration membrane by the above-mentioned in-out method. Various structures can be applied as long as they have a structure that allows them.
【０００９】これら中空糸濾過モジュール内に配設され
る多孔質中空糸としては、３Kg／cm 2 程度未満の圧力の
空気で加圧した場合に、空気が多孔質膜を透過しないも
のであればよく、例えばポリオレフィン系のような疎水
性の多孔質中空糸膜であっても、親水化処理されて細孔
内を水が透過でき、一方上記圧力未満では空気が透過し
ないような膜であればよい。[0009] installed in these hollow fiber filtration modules
3kg / cm as a porous hollow fiber 2 Less than of pressure
When pressurized with air, air does not permeate through the porous membrane.
As long as it is hydrophobic, such as polyolefin
Even porous porous hollow fiber membranes are treated with hydrophilicity
Water can permeate inside, while below the pressure, air permeates
Any film that does not exist may be used.
【００１０】中空糸濾過モジュール内に配設される中空
糸の形状としては、その開口端が固定部材により集束固
定されていれば、Ｕ字状に束ねられたものでもよいし、
一端を溶着等により封鎖した線状のものを束ねたもので
もよい。As for the shape of the hollow fibers arranged in the hollow fiber filtration module, the hollow fibers may be bundled in a U shape as long as the open ends thereof are focused and fixed by a fixing member,
It may be a bundle of linear objects whose one end is sealed by welding or the like.
【００１１】本発明の中空糸濾過モジュールの洗浄方法
は、上記のような中空糸濾過モジュールの濾過機能の回
復のための濾過時とは逆向きに水流を流す逆洗処理時
に、中空糸の外側に存する洗浄水の液面を徐々に下げつ
つ実施する。すなわち、洗浄水の流水開始時には該モジ
ュール中の中空糸の濾過膜として機能する部分のほぼ全
体が洗浄水に接する状態とし、一方、洗浄水の流水を停
止する際には中空糸の開口端の最遠部のみが洗浄水に接
する状態となるようにして洗浄水を流す方法である。The method for cleaning a hollow fiber filtration module according to the present invention is designed such that the outside of the hollow fiber is subjected to a backwashing process in which a water flow is made to flow in the opposite direction to the filtration for recovering the filtering function of the hollow fiber filtration module. It is carried out while gradually lowering the liquid level of the washing water existing in. That is, when the flush water starts flowing, almost all of the portion of the hollow fiber functioning as a filtration membrane in the module is in contact with the flush water. On the other hand, when the flush water is stopped, the opening end of the hollow fiber is This is a method of flowing the cleaning water so that only the farthest part is in contact with the cleaning water.
【００１２】本発明の中空糸濾過モジュールの逆洗方法
の実施に際しての洗浄水の送水圧力は、通常の逆洗方法
で使用されている圧力、すなわち濾過時の印加圧力の
１．５〜５倍程度の圧力（０．２〜５Kg／cm2 ）が加え
られる。ただし、洗浄水の液面を低下させていった場合
に、洗浄水の液面の上方に存する空気が多孔質中空糸を
透過する圧力まで上昇することは避ける必要があり、ま
た、中空糸膜が圧縮変形しない程度の圧力にコントロー
ルする必要がある。When the backwashing method of the hollow fiber filtration module of the present invention is carried out, the feed pressure of the washing water is 1.5 to 5 times the pressure used in the usual backwashing method, that is, the applied pressure during filtration. Moderate pressure (0.2-5 Kg / cm 2 ) is applied. However, if the liquid level of the wash water is lowered, it is necessary to avoid that the air above the liquid level of the wash water rises to the pressure at which it permeates the porous hollow fiber. It is necessary to control the pressure so that it does not compress and deform.
【００１３】本発明の逆洗方法により洗浄水を流し始め
ると、固定部材で収束された中空糸の開口端に最も近い
部分の細孔については、中空糸の中空部の通過抵抗の影
響を殆ど受けないので、まずこの部分に最大の洗浄水の
圧力が印加される。したがって、この部分における細孔
の機能回復処理が最も早く進行する。逆洗操作の進行に
伴ない液面が低下すると、透過性のよくなったこの開口
端に最も近い部分の細孔は空気層に露出するため、洗浄
水の透過圧力は印加されなくなる。すなわち、最大の洗
浄圧力は中空糸の開口端からやや離れた、洗浄水に接し
ている部分のうちの液面に最も近い位置へと移行し、こ
の部分での機能回復処理が最もよく進行する。このよう
にして、液面の低下とともに中空糸の最も大きな洗浄作
用を受ける位置が徐々に移動し、洗浄水の流水を停止す
る際には中空糸の開口端からの最遠部のみが洗浄水と接
していて洗浄作用を受ける。このように、本発明の方法
によれば、中空糸濾過モジュール内の中空糸の全ての部
位が大きな洗浄作用を受けるので、中空糸濾過モジュー
ル全体としての機能回復の度合を極めて大きくすること
が可能である。When the flush water is started to flow by the backwashing method of the present invention, the effect of the passage resistance of the hollow part of the hollow fiber is almost eliminated for the pores of the part closest to the open end of the hollow fiber converged by the fixing member. Since it is not received, the maximum pressure of washing water is first applied to this portion. Therefore, the functional recovery treatment of the pores in this portion proceeds the fastest. When the liquid level decreases with the progress of the backwashing operation, the pores of the portion closest to the open end where the permeability is improved are exposed to the air layer, so that the permeation pressure of the washing water is not applied. That is, the maximum cleaning pressure shifts to a position, which is slightly away from the open end of the hollow fiber, and is closest to the liquid surface in the part in contact with the cleaning water, and the function recovery process in this part proceeds best. .. In this way, as the liquid level decreases, the position where the hollow fiber receives the largest cleaning action gradually moves, and when stopping the running of the wash water, only the farthest part from the open end of the hollow fiber is washed water. It is in contact with and receives a cleaning action. As described above, according to the method of the present invention, since all parts of the hollow fiber in the hollow fiber filtration module are subjected to a large cleaning action, it is possible to significantly increase the degree of function recovery of the hollow fiber filtration module as a whole. Is.
【００１４】本発明の方法において洗浄水の液面の低下
は、一定の速度で連続的に実施することが最も効果的で
あるが、例えば液面の変動を階段状に実施してもよい
し、変動速度が徐々に遅くなるように変化させつつ実施
してしてもよい。また、液面を変動させる方法に関して
も特に限定されず、例えば濾過タンク内に圧縮空気を供
給して洗浄用水が少なくなることを利用して実施しても
よいし、濾過タンク内の洗浄水を徐々に排水しながら実
施してもよい。洗浄用水には、浄化水を用いることが好
ましい。In the method of the present invention, it is most effective to lower the liquid level of the washing water continuously at a constant speed, but the liquid level may be changed stepwise. Alternatively, it may be performed while changing the changing speed so as to gradually decrease. Further, the method of varying the liquid level is not particularly limited, and may be carried out, for example, by utilizing the fact that compressed air is supplied into the filtration tank to reduce the amount of cleaning water. You may implement it while draining gradually. Purified water is preferably used as the cleaning water.
【００１５】[0015]
【発明の効果】本発明の中空糸濾過モジュールの逆洗方
法は、濾過装置内の洗浄用水の液面を洗浄につれて徐々
に低下させるという極めて単純な操作でありながら、イ
ントゥーアウト方式の濾過に使用した中空糸濾過モジュ
ールの大幅な機能回復が達成できる。INDUSTRIAL APPLICABILITY The backwashing method for hollow fiber filtration modules of the present invention is an extremely simple operation of gradually lowering the liquid level of the washing water in the filtration apparatus as it is washed, but it is suitable for in-out type filtration. A large amount of functional recovery of the used hollow fiber filtration module can be achieved.
【００１６】[0016]
【実施例】以下、本発明の中空糸濾過モジュールの洗浄
方法を実施例に従いより具体的に説明する。EXAMPLES Hereinafter, the method for cleaning the hollow fiber filtration module of the present invention will be described in more detail with reference to Examples.
【００１７】実施例１ 内径７０mmφの環状部材内に、ポリエチレン製多孔質中
空糸（ポリエチレン中空糸ＥＨＦ８００、商品名、三菱
レイヨン (株) 製）３２００本を、有効膜長が４００mm
となるようポリウレタン製の固定部材でＵ字形に固定し
た中空糸濾過モジュール（総膜面積：約２ｍ2 ）を濾過
タンク内に装填して、被処理水（砂濾過後海水）をイン
トゥーアウト方式で濾過した。Example 1 3200 polyethylene porous hollow fibers (polyethylene hollow fiber EHF800, trade name, manufactured by Mitsubishi Rayon Co., Ltd.) having an effective film length of 400 mm were placed in an annular member having an inner diameter of 70 mmφ.
A hollow fiber filtration module (total membrane area: approx. 2 m 2 ) fixed in a U shape with a polyurethane fixing member is loaded into the filtration tank, and treated water (seawater after sand filtration) is introduced into the out-to-out system. Filtered through.
【００１８】運転開始当初のモジュールからの浄化水の
回収流量は０．２５ｍ3 ／hrであったが、徐々に回収流
量は低下し、運転開始２０時間後には、回収流量は０．
１５ｍ3 ／hrまで低下した。なお、被処理水の供給圧力
は０．５Kg／cm2 であった。この中空糸濾過モジュール
に対して洗浄水を１．０Kg／cm2 の圧力で中空糸膜の外
側から供給して逆洗を実施した。なお、逆洗に際して洗
浄水は濾過タンク内にあるもののみを使用し、逆洗圧力
は濾過タンク内に圧縮空気を供給することで加えた。逆
洗にしたがい、濾過タンク内の洗浄水の液面は徐々に低
下し、中空糸濾過モジュール全体が空気層に露出し、逆
洗が完了するまでに３分間を要した。The recovery flow rate of the purified water from the module at the beginning of the operation was 0.25 m 3 / hr, but the recovery flow rate gradually decreased, and the recovery flow rate was less than 20 hours after the start of the operation.
It decreased to 15 m 3 / hr. The supply pressure of the water to be treated was 0.5 kg / cm 2 . Backwashing was carried out by supplying washing water to the hollow fiber filtration module from the outside of the hollow fiber membrane at a pressure of 1.0 kg / cm 2 . In the backwashing, only wash water in the filtration tank was used, and the backwashing pressure was applied by supplying compressed air into the filtration tank. According to the backwash, the liquid level of the wash water in the filtration tank gradually decreased, the entire hollow fiber filtration module was exposed to the air layer, and it took 3 minutes to complete the backwash.
【００１９】この中空糸濾過モジュールを用いて再度同
じ被処理水の濾過を同条件で実施したところ、運転再開
当初のモジュールからの浄化水の回収流量は、被処理水
の供給圧力０．５Kg／cm2 で０．２４ｍ3 ／hrであっ
た。When the same treated water was filtered again under the same conditions using this hollow fiber filtration module, the purified water recovery flow rate from the module when the operation was restarted was 0.5 kg / min. It was 0.24 m 3 / hr in cm 2 .
【００２０】比較例１ 実施例１で用いたと同じ中空糸濾過モジュールを、実施
例１と同じ条件で濾過に使用した後、洗浄水を１．０Kg
／cm2 の圧力で３分間中空糸膜の外側から供給して逆洗
を実施した。なお、洗浄水は逆洗の間、濾過タンク内に
満杯の状態を保った。Comparative Example 1 The same hollow fiber filtration module used in Example 1 was used for filtration under the same conditions as in Example 1, and 1.0 Kg of washing water was used.
Backwashing was performed by supplying from the outside of the hollow fiber membrane at a pressure of / cm 2 for 3 minutes. The wash water was kept full in the filtration tank during the backwash.
【００２１】逆洗完了後、再度同じ被処理水の濾過を同
条件で実施したところ、運転再開当初のモジュールから
の浄化水の回収流量は被処理水の供給圧力０．５Kg／cm
2 で０．１９ｍ3 ／hrであった。After backwashing was completed, the same treated water was filtered again under the same conditions. As a result, the recovery flow rate of the purified water from the module when the operation was restarted was 0.5 kg / cm of the treated water supply pressure.
2 was 0.19 m 3 / hr.
Claims (1)
た多数の多孔質中空糸を具備し、被処理水を該中空糸の
中空部側から供給し、浄化水を該中空糸の外側から回収
する中空糸濾過モジュールの濾過機能の回復のための逆
洗方法において、中空糸の外側から中空糸の中空部に向
けて洗浄水を流すに際して、洗浄水の流水開始時には該
モジュール中の全中空糸が洗浄水に接する状態とし、洗
浄水の流水停止時には中空糸の開口端からの最遠部のみ
が洗浄水に接する状態となるように、中空糸の外側に存
する洗浄水の液面を徐々に下げつつ実施する過程を有す
ることを特徴とする中空糸濾過モジュールの逆洗方法。1. A large number of porous hollow fibers whose open ends are converged and fixed by a fixing member, to which water to be treated is supplied from the hollow side of the hollow fibers and purified water is recovered from the outside of the hollow fibers. In the backwashing method for recovering the filtering function of the hollow fiber filtration module, when washing water is flowed from the outside of the hollow fiber toward the hollow part of the hollow fiber, all the hollow fibers in the module are started at the start of flushing water flow. Is in contact with the wash water, and when the flow of the wash water is stopped, gradually change the level of the wash water outside the hollow fiber so that only the farthest part from the open end of the hollow fiber comes into contact with the wash water. A method for backwashing a hollow fiber filtration module, which comprises performing the process while lowering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP172592A JPH05184884A (en) | 1992-01-08 | 1992-01-08 | Method for backwashing hollow fiber membrane module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP172592A JPH05184884A (en) | 1992-01-08 | 1992-01-08 | Method for backwashing hollow fiber membrane module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05184884A true JPH05184884A (en) | 1993-07-27 |
Family
ID=11509543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP172592A Pending JPH05184884A (en) | 1992-01-08 | 1992-01-08 | Method for backwashing hollow fiber membrane module |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05184884A (en) |
Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08332357A (en) * | 1995-06-06 | 1996-12-17 | Toray Ind Inc | Method and apparatus for regenerating filter module |
| US6303035B1 (en) | 1999-07-30 | 2001-10-16 | Zenon Environmental Inc. | Immersed membrane filtration process |
| US6547968B1 (en) | 1999-07-30 | 2003-04-15 | Zenon Environmental Inc. | Pulsed backwash for immersed membranes |
| US7025885B2 (en) | 1998-11-23 | 2006-04-11 | Zenon Environmental Inc. | Water filtration using immersed membranes |
| US7063788B2 (en) | 1995-08-11 | 2006-06-20 | Zenon Environmental Inc. | Apparatus for withdrawing permeate using an immersed vertical skein of hollow fibre membranes |
| US7087173B2 (en) | 1995-08-11 | 2006-08-08 | Zenon Environmental Inc. | Inverted cavity aerator for membrane module |
| JP2010501340A (en) * | 2006-08-31 | 2010-01-21 | シーメンス・ウォーター・テクノロジーズ・コーポレーション | Low pressure backwash |
| USRE42669E1 (en) | 1995-08-11 | 2011-09-06 | Zenon Technology Partnership | Vertical cylindrical skein of hollow fiber membranes and method of maintaining clean fiber surfaces |
| WO2014069300A1 (en) * | 2012-10-31 | 2014-05-08 | 東レ株式会社 | Operating method for clarifying membrane module |
| US8840783B2 (en) | 2007-05-29 | 2014-09-23 | Evoqua Water Technologies Llc | Water treatment membrane cleaning with pulsed airlift pump |
| US8858796B2 (en) | 2005-08-22 | 2014-10-14 | Evoqua Water Technologies Llc | Assembly for water filtration using a tube manifold to minimise backwash |
| US8956464B2 (en) | 2009-06-11 | 2015-02-17 | Evoqua Water Technologies Llc | Method of cleaning membranes |
| US9023206B2 (en) | 2008-07-24 | 2015-05-05 | Evoqua Water Technologies Llc | Frame system for membrane filtration modules |
| US9022224B2 (en) | 2010-09-24 | 2015-05-05 | Evoqua Water Technologies Llc | Fluid control manifold for membrane filtration system |
| US9533261B2 (en) | 2012-06-28 | 2017-01-03 | Evoqua Water Technologies Llc | Potting method |
| US9604166B2 (en) | 2011-09-30 | 2017-03-28 | Evoqua Water Technologies Llc | Manifold arrangement |
| US9675938B2 (en) | 2005-04-29 | 2017-06-13 | Evoqua Water Technologies Llc | Chemical clean for membrane filter |
| US9764288B2 (en) | 2007-04-04 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane module protection |
| US9764289B2 (en) | 2012-09-26 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane securement device |
| US9815027B2 (en) | 2012-09-27 | 2017-11-14 | Evoqua Water Technologies Llc | Gas scouring apparatus for immersed membranes |
| US9914097B2 (en) | 2010-04-30 | 2018-03-13 | Evoqua Water Technologies Llc | Fluid flow distribution device |
| US9925499B2 (en) | 2011-09-30 | 2018-03-27 | Evoqua Water Technologies Llc | Isolation valve with seal for end cap of a filtration system |
| US9962865B2 (en) | 2012-09-26 | 2018-05-08 | Evoqua Water Technologies Llc | Membrane potting methods |
| US10322375B2 (en) | 2015-07-14 | 2019-06-18 | Evoqua Water Technologies Llc | Aeration device for filtration system |
| US10427102B2 (en) | 2013-10-02 | 2019-10-01 | Evoqua Water Technologies Llc | Method and device for repairing a membrane filtration module |
-
1992
- 1992-01-08 JP JP172592A patent/JPH05184884A/en active Pending
Cited By (36)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08332357A (en) * | 1995-06-06 | 1996-12-17 | Toray Ind Inc | Method and apparatus for regenerating filter module |
| US7063788B2 (en) | 1995-08-11 | 2006-06-20 | Zenon Environmental Inc. | Apparatus for withdrawing permeate using an immersed vertical skein of hollow fibre membranes |
| US7087173B2 (en) | 1995-08-11 | 2006-08-08 | Zenon Environmental Inc. | Inverted cavity aerator for membrane module |
| USRE42669E1 (en) | 1995-08-11 | 2011-09-06 | Zenon Technology Partnership | Vertical cylindrical skein of hollow fiber membranes and method of maintaining clean fiber surfaces |
| US7025885B2 (en) | 1998-11-23 | 2006-04-11 | Zenon Environmental Inc. | Water filtration using immersed membranes |
| US6303035B1 (en) | 1999-07-30 | 2001-10-16 | Zenon Environmental Inc. | Immersed membrane filtration process |
| US6547968B1 (en) | 1999-07-30 | 2003-04-15 | Zenon Environmental Inc. | Pulsed backwash for immersed membranes |
| US9675938B2 (en) | 2005-04-29 | 2017-06-13 | Evoqua Water Technologies Llc | Chemical clean for membrane filter |
| US8858796B2 (en) | 2005-08-22 | 2014-10-14 | Evoqua Water Technologies Llc | Assembly for water filtration using a tube manifold to minimise backwash |
| US8894858B1 (en) | 2005-08-22 | 2014-11-25 | Evoqua Water Technologies Llc | Method and assembly for water filtration using a tube manifold to minimize backwash |
| JP2010501340A (en) * | 2006-08-31 | 2010-01-21 | シーメンス・ウォーター・テクノロジーズ・コーポレーション | Low pressure backwash |
| US9764288B2 (en) | 2007-04-04 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane module protection |
| US9573824B2 (en) | 2007-05-29 | 2017-02-21 | Evoqua Water Technologies Llc | Membrane cleaning with pulsed airlift pump |
| US10507431B2 (en) | 2007-05-29 | 2019-12-17 | Evoqua Water Technologies Llc | Membrane cleaning with pulsed airlift pump |
| US8840783B2 (en) | 2007-05-29 | 2014-09-23 | Evoqua Water Technologies Llc | Water treatment membrane cleaning with pulsed airlift pump |
| US9206057B2 (en) | 2007-05-29 | 2015-12-08 | Evoqua Water Technologies Llc | Membrane cleaning with pulsed airlift pump |
| US9023206B2 (en) | 2008-07-24 | 2015-05-05 | Evoqua Water Technologies Llc | Frame system for membrane filtration modules |
| US8956464B2 (en) | 2009-06-11 | 2015-02-17 | Evoqua Water Technologies Llc | Method of cleaning membranes |
| US10441920B2 (en) | 2010-04-30 | 2019-10-15 | Evoqua Water Technologies Llc | Fluid flow distribution device |
| US9914097B2 (en) | 2010-04-30 | 2018-03-13 | Evoqua Water Technologies Llc | Fluid flow distribution device |
| US9022224B2 (en) | 2010-09-24 | 2015-05-05 | Evoqua Water Technologies Llc | Fluid control manifold for membrane filtration system |
| US9630147B2 (en) | 2010-09-24 | 2017-04-25 | Evoqua Water Technologies Llc | Fluid control manifold for membrane filtration system |
| US9925499B2 (en) | 2011-09-30 | 2018-03-27 | Evoqua Water Technologies Llc | Isolation valve with seal for end cap of a filtration system |
| US10391432B2 (en) | 2011-09-30 | 2019-08-27 | Evoqua Water Technologies Llc | Manifold arrangement |
| US11065569B2 (en) | 2011-09-30 | 2021-07-20 | Rohm And Haas Electronic Materials Singapore Pte. Ltd. | Manifold arrangement |
| US9604166B2 (en) | 2011-09-30 | 2017-03-28 | Evoqua Water Technologies Llc | Manifold arrangement |
| US9533261B2 (en) | 2012-06-28 | 2017-01-03 | Evoqua Water Technologies Llc | Potting method |
| US9764289B2 (en) | 2012-09-26 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane securement device |
| US9962865B2 (en) | 2012-09-26 | 2018-05-08 | Evoqua Water Technologies Llc | Membrane potting methods |
| US9815027B2 (en) | 2012-09-27 | 2017-11-14 | Evoqua Water Technologies Llc | Gas scouring apparatus for immersed membranes |
| CN104755156A (en) * | 2012-10-31 | 2015-07-01 | 东丽株式会社 | Operating method for clarifying membrane module |
| WO2014069300A1 (en) * | 2012-10-31 | 2014-05-08 | 東レ株式会社 | Operating method for clarifying membrane module |
| JPWO2014069300A1 (en) * | 2012-10-31 | 2016-09-08 | 東レ株式会社 | Operation method of turbidity removal membrane module |
| US10427102B2 (en) | 2013-10-02 | 2019-10-01 | Evoqua Water Technologies Llc | Method and device for repairing a membrane filtration module |
| US11173453B2 (en) | 2013-10-02 | 2021-11-16 | Rohm And Haas Electronic Materials Singapores | Method and device for repairing a membrane filtration module |
| US10322375B2 (en) | 2015-07-14 | 2019-06-18 | Evoqua Water Technologies Llc | Aeration device for filtration system |
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