JP2000157850A - Separating membrane preservation liquid and separating membrane module - Google Patents

Separating membrane preservation liquid and separating membrane module

Info

Publication number
JP2000157850A
JP2000157850A JP33666598A JP33666598A JP2000157850A JP 2000157850 A JP2000157850 A JP 2000157850A JP 33666598 A JP33666598 A JP 33666598A JP 33666598 A JP33666598 A JP 33666598A JP 2000157850 A JP2000157850 A JP 2000157850A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
separating membrane
separation membrane
water
used
sodium bisulfite
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.)
Pending
Application number
JP33666598A
Other languages
Japanese (ja)
Inventor
Takashi Akiyama
Shinji Tawara
伸治 田原
隆 秋山
Original Assignee
Nitto Denko Corp
日東電工株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date

Links

Abstract

PROBLEM TO BE SOLVED: To keep the high sterilization effect for a long period of time and prevent the deterioration of a separating membrane and the permeation performance thereof by preparing a separating membrane preservation liquid from a solution containing sodium bisulfite. SOLUTION: A separating membrane preservation liquid in the wet state used for preserving a separating membrane for separating permeated water by filling a raw water used in the fields of food industry, medical care, purification of water and the like when being not used in prepared from a solution containing sodium sulfite. The sodium sulfite is provided with the high sterilization effect for aerobic bacteria, free from toxicity, keeping its sterilization effect for a long time and not oxidizing a polymer nor deteriorating the separating membrane, by which the permeation performance is not lowered. The concentration of the sodium bisulfite to be used is preferably in the range of 0.01-5%, more preferably 0.02-0.05%. Although no particular restrictions are applied for a solvent, water is best for the purpose in consideration of operation properties, and among other things, sterilized water is preferred most.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、分離膜保存液及び分離膜モジュールに属する。 The present invention relates belongs to the separation membrane preservative solution and the separation membrane module.

【0002】 [0002]

【従来の技術】食品工業、医療、浄水処理などの分野では、原水を濾過して透過水を得るのに分離膜が利用されている。 BACKGROUND ART food industry, medical, in the fields such as water treatment, separation membranes to obtain to permeate filtered raw water is utilized. 分離膜には、精密ろ過膜、限界ろ過膜、逆浸透膜といった種類があり、その用途に応じて使い分けられる。 The separation membrane, microfiltration membrane, ultrafiltration membrane, there are types such as reverse osmosis membrane, and may vary depending on the application. また、形状によって管状型、中空糸型、平膜型等に分類され、これらが分離膜モジュール内に収納された状態で使用される。 Further, the tubular form by the shape, hollow-fiber, are classified into flat membrane type, etc., it is used in a state of being housed in the separation membrane module.

【0003】分離膜は、性能を維持するために、不使用時においても湿潤状態で保存される必要がある。 [0003] separation membrane, in order to maintain performance, need to be stored in a wet condition even when not in use. ところが、湿潤状態で保存すると、分離膜表面又はモジュール内に菌が繁殖し、却って性能が低下する。 However, when stored in the wet state, bacteria breed on the separation membrane surface, or the module, rather performance decreases. そのため、通常、不使用時には分離膜保存液をモジュール内に充填した状態で保存される。 Therefore, usually, when not in use is stored in a state filled with the separation membrane preservative solution in the module. 従来の分離膜保存液には、ホルムアルデヒド、次亜塩素酸ナトリウム又は過酸化水素といった成分を含む水溶液がある。 The conventional separation membrane preservative solution, aqueous solutions containing components formaldehyde, such as sodium hypochlorite or hydrogen peroxide.

【0004】 [0004]

【発明が解決しようとする課題】しかし、ホルムアルデヒドを含む水溶液は、高い殺菌効果を有するものの毒性が非常に強い。 [SUMMARY OF THE INVENTION] However, the aqueous solution containing formaldehyde is very toxic ones having a high sterilizing effect. そのため、分離膜モジュールを使用前に十分に洗浄しなければならず、面倒である。 Therefore, it is necessary to thoroughly washed prior to use separation membrane module, it is cumbersome. また、洗浄すると、それにより生じる排水が大量になり、排水の処理に困る。 Also, when washing, thereby resulting in the waste water is a large amount, troubled wastewater treatment.

【0005】次亜塩素酸ナトリウムや過酸化水素を含む水溶液の場合には、殺菌効果が時間の経過とともに低下するという欠点がある。 [0005] In the case of an aqueous solution containing sodium hypochlorite or hydrogen peroxide has the disadvantage that the sterilizing effect is reduced over time. その上、これらはガスを発生させるため、分離膜モジュールを開封する際に液が溢れ出る怖れがある。 Moreover, these are for generating a gas, there is a liquid fear overflowing is upon opening the separation membrane module. また、通常分離膜の材料としてポリスルホン等の高分子が用いられるが、次亜塩素酸ナトリウムや過酸化水素は高分子材料を酸化するので、分離膜の劣化、透過性能の低下をもたらす。 Although polymers polysulfone or the like is used as the material of the normal separation membrane, since sodium or hydrogen peroxide hypochlorite oxidizes the polymer material, resulting in deterioration of the separation membrane, a decrease in permeability.

【0006】それ故、本発明は、毒性をもたず、高い殺菌効果を長期間維持し、分離膜の劣化及び透過性能の低下をもたらさない分離膜保存液、並びにこれが充填された分離膜モジュールを提供することを目的としている。 [0006] Therefore, the present invention has no toxicity, and maintaining a high sterilization effect long term, the separation membrane preservative solution does not result in a reduction in degradation and permeation performance of the separation membrane, and the separation membrane module which is filled is an object of the present invention to provide a.

【0007】 [0007]

【課題を解決するための手段】本発明の分離膜保存液は、重亜硫酸ナトリウムを含む溶液からなることを特徴としている。 Separation membrane preservative solution of the present invention, in order to solve the problem] is characterized in that it consists of a solution containing sodium bisulfite. また、本発明の分離膜モジュールは、上記分離膜保存液が充填されていることを特徴としている。 Moreover, the separation membrane module of the present invention is characterized in that the separation membrane preservative solution is filled.

【0008】本発明の分離膜保存液の成分である重亜硫酸ナトリウムは、好気性菌に対して高い殺菌作用を有する。 [0008] sodium bisulfite, which is a component of the separation membrane preservative solution of the present invention have high bactericidal action against aerobic bacteria. また、毒性をもたず、殺菌効果を長期間維持し、しかも高分子を酸化しないので分離膜を劣化させず、よって透過性能を低下させない。 Further, no toxicity, maintaining the sterilization effect long time, moreover without deteriorating the separation membrane does not oxidize high molecular, therefore does not decrease the permeability. また、これが充填された分離膜モジュールでは、人体を害する心配が無く、菌の繁殖が長期間抑制され、しかも分離膜の劣化や透過性能の低下を招くことがない。 Further, the separation membrane module which is filled, there is no fear of harming the human body, propagation of bacteria can be suppressed long-term, yet does not lead to a reduction in the degradation or permeation performance of the separation membrane. なお、本発明の分離膜保存液は、好気性菌に対してのみ殺菌効果を有し、嫌気性菌に対しては殺菌効果を有しない。 Incidentally, the separation membrane preservative solution of the present invention has only a sterilizing effect against aerobic bacteria, no bactericidal effect on anaerobic bacteria. しかし、分離膜モジュールの製造過程若しくは保存中において混入する菌は通常好気性菌であるので、嫌気性菌については考慮に入れなくても良い。 However, since the bacteria mixed in the manufacturing process or during storage of the separation membrane module is a normal aerobic bacteria, it may be taken into account for the anaerobes.

【0009】 [0009]

【発明の実施の形態】本発明の分離膜保存液において、 DETAILED DESCRIPTION OF THE INVENTION In the separation membrane preservative solution of the present invention,
重亜硫酸ナトリウムの好ましい濃度は0.01〜5%であり、より好ましい濃度は0.02〜0.05%である。 The preferred concentration of sodium bisulfite is from 0.01 to 5%, more preferred concentration is 0.02 to 0.05% by weight. 溶媒については特に限定されないが、操作性を考慮すると水が最も良い。 No particular limitation is imposed on the solvent, it is best to consider the water operability. 中でも無菌水が好ましい。 Among them, sterile water is preferred.

【0010】本発明の分離膜保存液は、分離膜の種類・ [0010] The separation membrane preservative solution of the present invention, the type of separation membrane -
形状を問わず適用可能であり、分離膜の材料についても制限は無い。 Is applicable regardless of the shape, also no limitation on the material of the separation membrane. 本発明の分離膜保存液の使用方法は、従来と同様であり、特に限定はない。 Using the separation membrane preservative solution of the present invention is the same as the conventional, not particularly limited. 最も一般的なのは、本発明の分離膜保存液をモジュール内に充填して分離膜を浸漬する方法であるが、分離膜保存液を膜表面に付けるだけでも良い。 The most common is a method of immersing the separation membrane separating membrane preservative solution is filled in the module of the present invention, it may simply attach a separation membrane preservative solution to the membrane surface.

【0011】 [0011]

【実施例】−実施例1− 重亜硫酸ナトリウムを5%含む水溶液からなる分離膜保存液を以下の試験に供試した。 EXAMPLES - The separation membrane preservative solution comprising an aqueous solution containing 5% Example 1 sodium bisulfite this was subjected to the following tests. まず、ポリスルホンからなる中空糸型分離膜を収納するモジュールを準備し、その中に上記保存液を充填することにより、分離膜を浸漬した。 First, prepare the module for housing the hollow fiber type separation membranes made of polysulfone, by filling the storage solution therein was immersed separation membrane. 次に、浸漬してから8日後及び30日後に分離膜保存液を取り除いてから、原水(種類:無菌純水、量: Next, eliminate the separation membrane preservative solution after immersion after 8 days and after 30 days, the raw water (Type: sterile deionized water, the amount:
80l/分)を差圧1.0kgf/cm で濾過し、得られた透過水の量を測定した。 80l / min) and filtered through a differential pressure 1.0 kgf / cm 2 to measure the amount of the resulting permeate. 続いて、所定量の透過水を一定条件下で培養した後、透過水中に含まれる生菌の数を測定した。 Then, after culturing a predetermined amount of the permeated water under certain conditions, to determine the number of viable cells contained in the transmitted water. 同時に、中空糸膜の引張り強度、伸び率、パッキン(アクリロニトリルブタジエンゴム製)の重量、及び注型樹脂(エポキシ樹脂)の硬度を測定した。 At the same time, the tensile strength of the hollow fiber membrane, elongation, hardness was measured of the packing weight (acrylonitrile butadiene rubber), and casting resin (epoxy resin). そして、これらの測定結果を、分離膜保存液を充填する前における結果(初期値)と比較した。 Then, these measurements were compared result before filling the separation membrane preservative solution (initial value). 表1に結果を示す。 The results are shown in Table 1.

【0012】また、次亜塩素酸ナトリウムを5%含む水溶液からなる分離膜保存液についても同様に試験した。 Furthermore, it was similarly tested separation membrane preservative solution comprising an aqueous solution containing sodium hypochlorite 5%.
この結果を表2に示す。 The results are shown in Table 2.

【0013】 [0013]

【表1】 -------------------------------------------------------------- 初期値 8日後 30日後 ------ ------ -------- 透過水量(m /m h) 0.82 0.81 0.82 生菌数(CFU/ml) 0.0 0.0 0.0 引張り強度(kgf/cm ) 29.0 28.5 28.6 伸び率(%) 38.0 38.0 37.8 パッキン重量(g) 0.32 0.32 0.31 注型樹脂硬度(JIS-A) 99以上 99以上 99以上 -------------------------------------------------------------- [Table 1] ---------------------------------------------- ---------------- initial value 8 days after 30 days after ------ ------ -------- permeate flow (m 3 / m 2 h) 0.82 0.81 0.82 number of living bacteria (CFU / ml) 0.0 0.0 0.0 tensile strength (kgf / cm 2) 29.0 28.5 28.6 elongation (%) 38.0 38.0 37.8 packing weight (g) 0.32 0.32 0.31 casting resin hardness (JIS- A) 99 or more 99 or more 99 or more ------------------------------------------ --------------------

【0014】 [0014]

【表2】 -------------------------------------------------------------- 初期値 8日後 30日後 ------ ------ -------- 透過水量(m /m h) 0.80 0.78 0.77 生菌数(CFU/ml) 0.0 0.4 0.7 引張り強度(kgf/cm ) 29.0 28.0 26.0 伸び率(%) 38.0 34.0 27.0 パッキン重量(g) 0.32 0.32 0.32 注型樹脂硬度(JIS-A) 99以上 99以上 99以上 -------------------------------------------------------------- [Table 2] ---------------------------------------------- ---------------- initial value 8 days after 30 days after ------ ------ -------- permeate flow (m 3 / m 2 h) 0.80 0.78 0.77 number of living bacteria (CFU / ml) 0.0 0.4 0.7 tensile strength (kgf / cm 2) 29.0 28.0 26.0 elongation (%) 38.0 34.0 27.0 packing weight (g) 0.32 0.32 0.32 casting resin hardness (JIS- A) 99 or more 99 or more 99 or more ------------------------------------------ --------------------

【0015】表2に見られるように、次亜塩素酸ナトリウムを含む分離膜保存液では、時間の経過とともに生菌数が増加し、また、分離膜の劣化及び透過性能の低下が認められた。 [0015] As seen in Table 2, in the separation membrane preservative solution containing sodium hypochlorite increases the number of viable bacteria with time, also, degradation and reduction in transmission performance of the separation membrane was observed . それに対して重亜硫酸ナトリウムを含む分離膜保存液の場合には、表1に見られるように、全ての項目において30日後の測定結果でも初期値とほとんど変わらなかった。 In the case of the separation membrane preservative solution containing sodium bisulfite thereto, as seen in Table 1, was almost the same measurement result even initial value after 30 days in all items. 以上より、本発明の分離膜保存液は、 From the above, the separation membrane preservative solution of the present invention,
高い殺菌効果を長期間維持し、分離膜の劣化及び透過性能の低下をもたらさないということが確認された。 Maintaining a high sterilization effect long-term, it does not lead to deterioration and reduced permeability of the separation membrane was observed.

【0016】−実施例2− 重亜硫酸ナトリウムの濃度が0.01、0.02、0. [0016] - Example 2 Concentration of sodium bisulfite is 0.01,0.02,0.
05、0.5、5、及び10%である水溶液をそれぞれ用意し、実施例1と同じ方法で試験した。 05,0.5,5, and aqueous 10% were prepared, respectively, were tested in the same manner as in Example 1. 但し、測定は、浸漬してから30日後にのみ行った。 However, the measurement was carried out only in 30 days after immersion. 結果を表3に示す。 The results are shown in Table 3.

【0017】 [0017]

【表3】 ---------------------------------------------------------------------- 0.01% 0.02% 0.05% 0.5% 5% 10% ----- ----- ----- ----- ---- ---- 透過水量(m /m h) 0.80 0.82 0.81 0.80 0.82 0.80 生菌数(CFU/ml) 0.1 0.0 0.0 0.0 0.0 0.0 引張り強度(kgf/cm ) 28.3 28.6 28.6 28.5 28.6 28.0 伸び率(%) 38.0 38.1 38.0 38.0 37.8 37.8 パッキン重量(g) 0.31 0.32 0.31 0.31 0.31 0.31 注型樹脂硬度(JIS-A) 99以上 99以上 99以上 99以上 99以上 99以上 ---------------------------------------------------------------------- [Table 3] ---------------------------------------------- ------------------------ 0.01% 0.02% 0.05% 0.5% 5% 10% ----- ----- ---- - ----- ---- ---- permeate flow (m 3 / m 2 h) 0.80 0.82 0.81 0.80 0.82 0.80 number of living bacteria (CFU / ml) 0.1 0.0 0.0 0.0 0.0 0.0 tensile strength (kgf / cm 2) 28.3 28.6 28.6 28.5 28.6 28.0 elongation (%) 38.0 38.1 38.0 38.0 37.8 37.8 packing weight (g) 0.31 0.32 0.31 0.31 0.31 0.31 casting resin hardness (JIS-A) 99 99 99 or more 99 or more 99 or more 99 that's all ------------------------------------------------- ---------------------

【0018】表3の結果より、重亜硫酸ナトリウムの好ましい濃度は0.01〜5%であり、中でも0.02〜 [0018] From the results of Table 3, the preferred concentration of sodium bisulfite is 0.01% to 5%, inter alia 0.02
0.05%が最適であることが明らかとなった。 0.05% was found to be optimal.

【0019】 [0019]

【発明の効果】本発明の分離膜保存液は、毒性をもたず、高い殺菌効果を長期間維持し、分離膜の劣化及び透過性能の低下をもたらさない。 Separation membrane preservative solution of the present invention according to the present invention has no toxicity, and maintaining a high sterilization effect long time, it does not result in a degradation and reduction in transmission performance of the separation membrane. よって、これが充填された分離膜モジュールでは、人体を害する心配が無く、菌の繁殖が長期間抑制され、しかも分離膜の劣化や透過性能の低下を招くことがない。 Thus, the separation membrane module which is filled, there is no fear of harming the human body, propagation of bacteria can be suppressed long-term, yet does not lead to a reduction in the degradation or permeation performance of the separation membrane.

フロントページの続き Fターム(参考) 4D006 GA03 GA06 GA07 HA01 KC21 KD30 KE05P KE06P LA01 MA01 MB16 MB18 MC62X PA01 PB02 PC11 PC41 Front page of the continued F-term (reference) 4D006 GA03 GA06 GA07 HA01 KC21 KD30 KE05P KE06P LA01 MA01 MB16 MB18 MC62X PA01 PB02 PC11 PC41

Claims (4)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】重亜硫酸ナトリウムを含む溶液からなることを特徴とする分離膜保存液。 1. A separation membrane preservative solution characterized by comprising a solution containing sodium bisulfite.
  2. 【請求項2】重亜硫酸ナトリウムの濃度が、0.01〜 Wherein the concentration of sodium bisulfite is 0.01
    5%である請求項1に記載の分離膜保存液。 Separation membrane preservative solution according to claim 1 which is 5%.
  3. 【請求項3】重亜硫酸ナトリウムの濃度が、0.02〜 Wherein the concentration of sodium bisulfite is 0.02
    0.05%である請求項1に記載の分離膜保存液。 Separation membrane preservative solution according to claim 1 is 0.05%.
  4. 【請求項4】請求項1〜3のいずれかに記載の分離膜保存液が充填されていることを特徴とする分離膜モジュール。 4. A separation membrane module separation membrane preservation solution as claimed in any one of claims 1 to 3, characterized in that it is filled.
JP33666598A 1998-11-27 1998-11-27 Separating membrane preservation liquid and separating membrane module Pending JP2000157850A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33666598A JP2000157850A (en) 1998-11-27 1998-11-27 Separating membrane preservation liquid and separating membrane module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33666598A JP2000157850A (en) 1998-11-27 1998-11-27 Separating membrane preservation liquid and separating membrane module

Publications (1)

Publication Number Publication Date
JP2000157850A true true JP2000157850A (en) 2000-06-13

Family

ID=18301540

Family Applications (1)

Application Number Title Priority Date Filing Date
JP33666598A Pending JP2000157850A (en) 1998-11-27 1998-11-27 Separating membrane preservation liquid and separating membrane module

Country Status (1)

Country Link
JP (1) JP2000157850A (en)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1312408A2 (en) * 2001-11-16 2003-05-21 US Filter Wastewater Group, Inc. Method of cleaning membranes
WO2005123233A1 (en) * 2004-06-22 2005-12-29 Toyo Boseki Kabushiki Kaisha Storage solution for fluid separator and/or membrane element, fluid separator and membrane element, and method of storing the same
JP2007063222A (en) * 2005-09-01 2007-03-15 Mitsubishi Rayon Eng Co Ltd Preservation liquid for separation membrane, separation membrane module and method for preservation of separation membrane
JP2009241042A (en) * 2008-03-31 2009-10-22 Mitsui Eng & Shipbuild Co Ltd Method and apparatus for refreshing membrane for preparing ballast water
JP2010137209A (en) * 2008-12-09 2010-06-24 Uerushii:Kk Water treatment method
US8268176B2 (en) 2003-08-29 2012-09-18 Siemens Industry, Inc. Backwash
US8287743B2 (en) 2007-05-29 2012-10-16 Siemens Industry, Inc. Membrane cleaning with pulsed airlift pump
US8293098B2 (en) 2006-10-24 2012-10-23 Siemens Industry, Inc. Infiltration/inflow control for membrane bioreactor
US8318028B2 (en) 2007-04-02 2012-11-27 Siemens Industry, Inc. Infiltration/inflow control for membrane bioreactor
US8377305B2 (en) 2004-09-15 2013-02-19 Siemens Industry, Inc. Continuously variable aeration
US8382981B2 (en) 2008-07-24 2013-02-26 Siemens Industry, Inc. Frame system for membrane filtration modules
US8496828B2 (en) 2004-12-24 2013-07-30 Siemens Industry, Inc. Cleaning in membrane filtration systems
US8506806B2 (en) 2004-09-14 2013-08-13 Siemens Industry, Inc. Methods and apparatus for removing solids from a membrane module
US8512568B2 (en) 2001-08-09 2013-08-20 Siemens Industry, Inc. Method of cleaning membrane modules
US8518256B2 (en) 2001-04-04 2013-08-27 Siemens Industry, Inc. Membrane module
US8758622B2 (en) 2004-12-24 2014-06-24 Evoqua Water Technologies Llc Simple gas scouring method and apparatus
US8758621B2 (en) 2004-03-26 2014-06-24 Evoqua Water Technologies Llc Process and apparatus for purifying impure water using microfiltration or ultrafiltration in combination with reverse osmosis
US8790515B2 (en) 2004-09-07 2014-07-29 Evoqua Water Technologies Llc Reduction of backwash liquid waste
US8808540B2 (en) 2003-11-14 2014-08-19 Evoqua Water Technologies Llc Module cleaning method
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
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

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8518256B2 (en) 2001-04-04 2013-08-27 Siemens Industry, Inc. Membrane module
US8512568B2 (en) 2001-08-09 2013-08-20 Siemens Industry, Inc. Method of cleaning membrane modules
EP1312408A3 (en) * 2001-11-16 2003-08-06 US Filter Wastewater Group, Inc. Method of cleaning membranes
EP1312408A2 (en) * 2001-11-16 2003-05-21 US Filter Wastewater Group, Inc. Method of cleaning membranes
US8268176B2 (en) 2003-08-29 2012-09-18 Siemens Industry, Inc. Backwash
US8808540B2 (en) 2003-11-14 2014-08-19 Evoqua Water Technologies Llc Module cleaning method
US8758621B2 (en) 2004-03-26 2014-06-24 Evoqua Water Technologies Llc Process and apparatus for purifying impure water using microfiltration or ultrafiltration in combination with reverse osmosis
JP2006224085A (en) * 2004-06-22 2006-08-31 Toyobo Co Ltd Preservation liquid for fluid separation apparatus and/or membrane element, fluid separation apparatus, membrane element, and preservation method of membrane element
WO2005123233A1 (en) * 2004-06-22 2005-12-29 Toyo Boseki Kabushiki Kaisha Storage solution for fluid separator and/or membrane element, fluid separator and membrane element, and method of storing the same
US8790515B2 (en) 2004-09-07 2014-07-29 Evoqua Water Technologies Llc Reduction of backwash liquid waste
US8506806B2 (en) 2004-09-14 2013-08-13 Siemens Industry, Inc. Methods and apparatus for removing solids from a membrane module
US8377305B2 (en) 2004-09-15 2013-02-19 Siemens Industry, Inc. Continuously variable aeration
US8496828B2 (en) 2004-12-24 2013-07-30 Siemens Industry, Inc. Cleaning in membrane filtration systems
US8758622B2 (en) 2004-12-24 2014-06-24 Evoqua Water Technologies Llc Simple gas scouring method and apparatus
US9675938B2 (en) 2005-04-29 2017-06-13 Evoqua Water Technologies Llc Chemical clean for membrane filter
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
US8858796B2 (en) 2005-08-22 2014-10-14 Evoqua Water Technologies Llc Assembly for water filtration using a tube manifold to minimise backwash
JP2007063222A (en) * 2005-09-01 2007-03-15 Mitsubishi Rayon Eng Co Ltd Preservation liquid for separation membrane, separation membrane module and method for preservation of separation membrane
US8293098B2 (en) 2006-10-24 2012-10-23 Siemens Industry, Inc. Infiltration/inflow control for membrane bioreactor
US8623202B2 (en) 2007-04-02 2014-01-07 Siemens Water Technologies Llc Infiltration/inflow control for membrane bioreactor
US8318028B2 (en) 2007-04-02 2012-11-27 Siemens Industry, Inc. Infiltration/inflow control for membrane bioreactor
US9764288B2 (en) 2007-04-04 2017-09-19 Evoqua Water Technologies Llc Membrane module protection
US8372276B2 (en) 2007-05-29 2013-02-12 Siemens Industry, Inc. 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
US8287743B2 (en) 2007-05-29 2012-10-16 Siemens Industry, Inc. Membrane cleaning with pulsed airlift pump
US8622222B2 (en) 2007-05-29 2014-01-07 Siemens Water Technologies Llc Membrane cleaning with pulsed airlift pump
US9573824B2 (en) 2007-05-29 2017-02-21 Evoqua Water Technologies Llc Membrane cleaning with pulsed airlift pump
US9206057B2 (en) 2007-05-29 2015-12-08 Evoqua Water Technologies Llc Membrane cleaning with pulsed airlift pump
JP2009241042A (en) * 2008-03-31 2009-10-22 Mitsui Eng & Shipbuild Co Ltd Method and apparatus for refreshing membrane for preparing ballast water
US8382981B2 (en) 2008-07-24 2013-02-26 Siemens Industry, Inc. Frame system for membrane filtration modules
US9023206B2 (en) 2008-07-24 2015-05-05 Evoqua Water Technologies Llc Frame system for membrane filtration modules
JP2010137209A (en) * 2008-12-09 2010-06-24 Uerushii:Kk Water treatment method
US8956464B2 (en) 2009-06-11 2015-02-17 Evoqua Water Technologies Llc Method of cleaning membranes
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
US9604166B2 (en) 2011-09-30 2017-03-28 Evoqua Water Technologies Llc Manifold arrangement
US9925499B2 (en) 2011-09-30 2018-03-27 Evoqua Water Technologies Llc Isolation valve with seal for end cap of a filtration system
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

Similar Documents

Publication Publication Date Title
US5605627A (en) Dialysate filter including an asymmetric microporous, hollow fiber membrane incorporating a polyimide
Choi et al. The behavior of membrane fouling initiation on the crossflow membrane bioreactor system
Rouaix et al. Experimental study of the effects of hypochlorite on polysulfone membrane properties
US4720343A (en) Macroporous asymmetrical hydrophilic membrane made of a synthetic polymer
US5028332A (en) Hydrophilic material and method of manufacturing
US4610790A (en) Process and system for producing sterile water and sterile aqueous solutions
US6248238B1 (en) Medical apparatus for the extracorporeal treatment of blood or plasma, and processes for using this apparatus
US5431817A (en) Bleach resistant polysulfone/polyurethane composite membranes
US5543465A (en) Process for the production of hydrophilic membranes
US6432309B1 (en) Polysulfone-base hollow-fiber hemocathartic membrane and processes for the production thereof
US20030038074A1 (en) Antimicrobial semi-permeable membranes
Osada et al. Water and protein permeation through polymeric membrane having mechanochemically expanding and contracting pores. Function of chemical valve. I
US4690772A (en) Sterilant compositions
US4432875A (en) Semi-permeable membranes and processes for making the same
US5641450A (en) Process of making a module including a polysulphonic hollow fiber membrane
US4784768A (en) Capillary filter arrangement for sterilization of liquid media
US5279739A (en) Durable filtration membrane having optimized molecular weight
US4450126A (en) High strength nylon blend membranes
US5628959A (en) Composition and methods for sterilizing dialyzers
US4938872A (en) Treatment for reverse osmosis membranes
JPH08197053A (en) Method for purifying natural water with membrane
JP2000140589A (en) Porous polysulfone film
EP0509663A1 (en) Dialysis module with a selectively transmissive polysulfonic hollow fiber membrane and method of manufacture thereof
Luttinger et al. Improved hemodialysis membranes for the artificial kidney
EP1710011A1 (en) Filtration membrane