JPH05285348A - Vertical type hollow fiber membrane module - Google Patents
Vertical type hollow fiber membrane moduleInfo
- Publication number
- JPH05285348A JPH05285348A JP11222592A JP11222592A JPH05285348A JP H05285348 A JPH05285348 A JP H05285348A JP 11222592 A JP11222592 A JP 11222592A JP 11222592 A JP11222592 A JP 11222592A JP H05285348 A JPH05285348 A JP H05285348A
- Authority
- JP
- Japan
- Prior art keywords
- hollow fiber
- pipe
- fiber membrane
- module
- perforated air
- 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
Links
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】膜モジュ−ル中、中空糸膜モジュ
−ルにおいては、単位体積当りの膜面積を大きくとリ
得、また、縦型で設置することにより平面設置占有スペ
−スを小さくできる。中空糸膜モジュ−ルにおいては、
かかる有利性のために、その用途は広範囲であり、例え
ば、原子力発電所、火力発電所の復水の浄化に有用であ
る。[Industrial application] In hollow fiber membrane modules, it is possible to obtain a large membrane area per unit volume in a membrane module. Also, by installing vertically, the space occupied by a flat surface can be increased. Can be made smaller. In the hollow fiber membrane module,
Because of such advantages, its applications are wide-ranging and are useful, for example, in the purification of condensate in nuclear power plants, thermal power plants.
【０００２】図２はかかる用途に対する縦型中空糸膜モ
ジュ−ルの設置構造の一例を示している。図２におい
て、Ｍ’は中空糸膜モジュ−ルを示し、縦型保護筒１’
内に複数本の中空糸膜２’と集水管４’と孔開き送気管
３’とを収容し、その保護筒１’の両端にこれらの収容
物２’，３’，４’の両端を両端開口状態で固定してあ
る。ただし、上側モジュ−ルにおける孔開き送気管３’
の上端30'は閉塞してある。１１’は保護筒１’に設け
た原水供給孔である。６’は耐圧容器内を透過液室６
１’と原水室６２’とに仕切る管板であり、上側モジュ
−ルを水密状態で懸垂支持し、当該上側モジュ−ルの中
空糸膜上端並びに集水管上端を透過液室６１’に開通し
てある。８’はモジュ−ルの接続部であり、保護筒
１’，１’間を接続筒８１’で水密に接続すると共に孔
開き送気管３’，３’を連通管８２’により気密に接続
し、接続筒８１’内に集水室ａ’を形成している。９’
は下側モジュ−ルの下端のキャップ部であり、保護筒
１’にキャップ９１’を水密に取着し、キャップ９１’
内に集水室ａ’を形成し、孔開き送気管３’の下端をエ
ア導入管９２’によりキャップ９１’外に気密に引き出
してある。FIG. 2 shows an example of an installation structure of a vertical hollow fiber membrane module for such an application. In FIG. 2, M'denotes a hollow fiber membrane module, which is a vertical protective cylinder 1 '.
A plurality of hollow fiber membranes 2 ', a water collecting pipe 4', and a perforated air feeding pipe 3'are housed therein, and both ends of these contents 2 ', 3', 4'are provided at both ends of the protective cylinder 1 '. It is fixed with both ends open. However, the perforated air pipe 3'in the upper module
The upper end 30 'of the is closed. Reference numeral 11 'is a raw water supply hole provided in the protective cylinder 1'. 6'is the permeate chamber 6 in the pressure vessel.
1'is a tube plate for partitioning the raw water chamber 62 ', the upper module is suspended and supported in a watertight state, and the upper end of the hollow fiber membrane and the upper end of the water collection pipe of the upper module are opened to the permeate chamber 61'. There is. Reference numeral 8'denotes a connecting portion of the module, which connects the protective cylinders 1'and 1'in a watertight manner with a connecting cylinder 81 ', and connects the perforated air supply pipes 3'and 3'in a gas-tight manner by a communication pipe 82'. A water collecting chamber a'is formed in the connecting cylinder 81 '. 9 '
Is a cap portion at the lower end of the lower module, and a cap 91 ′ is attached to the protective cylinder 1 ′ in a watertight manner.
A water collection chamber a'is formed inside, and the lower end of the perforated air supply pipe 3'is airtightly drawn out of the cap 91 'by an air introduction pipe 92'.
【０００３】上記モジュ−ルによって、原水を濾過する
には、原水室６２’に原水を圧入し、この圧入原水を保
護筒１’内に原水供給孔１１’から導入し、この導入原
水を中空糸膜２’で濾過する。この濾過により生成した
透過液が中空糸膜２’内を上方向並びに下方向に向かっ
て流動し、下方向透過液が一旦集水室ａ’で集水され、
次いで、集水管４’により上側に導かれ、前記の直接上
方向に向かって流動する透過液流れに合流され、下側モ
ジュ−ルにおける合流透過液は更に上側モジュ−ルの集
水管４’を通り、透過液室６１’に透過液が流入してい
く。In order to filter the raw water by the above-mentioned module, the raw water is pressed into the raw water chamber 62 ', the raw water is introduced into the protective cylinder 1'through the raw water supply hole 11', and the introduced raw water is hollow. Filter with a thread membrane 2 '. The permeate generated by this filtration flows upward and downward in the hollow fiber membrane 2 ', and the downward permeate is once collected in the water collecting chamber a',
Then, it is guided to the upper side by the water collection pipe 4'and merged with the permeate flow flowing directly upward, and the combined permeated liquid in the lower module further passes through the water collection pipe 4'of the upper module. As a result, the permeate flows into the permeate chamber 61 '.
【０００４】上記において、集水管４’内の流通抵抗を
中空糸膜２’内の流通抵抗に較べて著しく低くしてあ
り、集水管４’内での透過液の圧損を事実上、無視でき
るので、上記中空糸膜２’内での透過液の上下両方向へ
の分流のために、透過液の圧損を実質上、中空糸膜長さ
の２分の１相当分に低減できる。In the above, the flow resistance in the water collection pipe 4'is made significantly lower than the flow resistance in the hollow fiber membrane 2 ', and the pressure loss of the permeate in the water collection pipe 4'can be virtually ignored. Therefore, the pressure loss of the permeate can be reduced substantially to one half of the length of the hollow fiber membrane due to the up and down splitting of the permeate in the hollow fiber membrane 2 '.
【０００５】膜モジュ−ルにおいては、使用時間の経過
と共に膜表面へのスケ−ルの付着によってクラッドが形
成され、濾過圧力の上昇、濾過速度の低下が避けらず、
濾過圧力が所定圧力に達すると、膜洗浄を行う必要があ
る。そこで、上記の縦型中空糸膜モジュ−ルにおいて
は、エア導入管９２’より孔開き送気管３’内にエアを
圧入し、この圧入エアを孔開き送気管３’の孔より気泡
として各モジュ−ルの保護筒１’内の原水中に放出さ
せ、この気泡の中空糸膜２’への衝突並びに上昇気泡に
よって誘起される原水の対流によって中空糸膜表面のク
ラッドをスクラビングし、この剥離クラッドを各モジュ
−ルの保護筒下方の原水供給孔より排出すると共に気泡
を保護筒上方の原水供給孔から流出させている。In the membrane module, a clad is formed due to the adhesion of the scale to the membrane surface with the lapse of use time, and an increase in filtration pressure and a reduction in filtration speed are unavoidable.
When the filtration pressure reaches a predetermined pressure, it is necessary to wash the membrane. Therefore, in the above vertical hollow fiber membrane module, air is press-fitted into the air feed pipe 3 ′ through the air introduction pipe 92 ′, and the press-fitted air is bubbled through the holes of the perforated air feed pipe 3 ′. It is discharged into the raw water in the protective cylinder 1'of the module, and the clad on the surface of the hollow fiber membrane is scrubbed by the collision of the bubbles with the hollow fiber membrane 2'and the convection of the raw water induced by the rising bubbles, and this separation The clad is discharged from the raw water supply hole below the protective cylinder of each module, and the bubbles are discharged from the raw water supply hole above the protective cylinder.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記の
濾過装置においては、縦型中空糸膜モジュ−ルを縦列接
続してあり、長尺であって、中空糸膜に作用する動揺力
のためにモ−メント（曲げモ−メント並びに捩じりモ−
メント）が発生し、特に上側モジュ−ルにおいては、著
大なモ−メントが作用するため、中空糸膜並びに孔開き
送気管の曲げ破損、捩じれ破損が懸念される。本発明の
目的は、エアスクラビング法により膜洗浄しても、モジ
ュ−ル全体の曲げ並びに捩じれに対する剛性を高くし、
中空糸膜並びに孔開き送気管を曲げ、捩じれモ−メント
に対して安定に保持できる縦型中空糸膜モジュ−ルを提
供することにある。However, in the above-mentioned filtration device, the vertical hollow fiber membrane modules are connected in cascade, and the length is long, so that the hollow fiber membrane modules are swayed by the swaying force. Moment (bending moment and twisting moment)
Is generated, and particularly in the upper module, a significant moment acts, so that there is a concern that the hollow fiber membrane and the perforated air pipe may be bent or twisted. The object of the present invention is to increase the rigidity of the entire module against bending and twisting even if the film is cleaned by an air scrubbing method,
It is an object of the present invention to provide a vertical hollow fiber membrane module capable of bending a hollow fiber membrane and a perforated air pipe and stably holding them against a twisting moment.
【０００７】[0007]
【課題を解決するための手段】本発明の縦型中空糸膜モ
ジュ−ルは、外筒内に複数本の中空糸膜が両端において
接着剤で両端開口の状態で固定され、中空糸膜の下端側
に透過液の集水部が存在し、該集水部を中空糸膜上端側
に連通する集水管の上下端が上記接着剤によって上記外
筒に固定され、エアスクラビング用空気の孔開き送気管
の上下端が同上接着剤によって上記外筒に固定されてな
る膜モジュ−ルにおいて、上記孔開き送気管が外筒の中
央に配設され、この孔開き送気管に対し集水管が放射状
に配設されていることを特徴とする構成であり、縦列配
置で、外筒間を接続部材によって接続すると共に孔開き
送気管を連通部材により連通して使用し、各モジュ−ル
における孔開き送気管の途中に仕切を設けることができ
る。A vertical hollow fiber membrane module of the present invention comprises a hollow fiber membrane module in which a plurality of hollow fiber membranes are fixed at both ends in an outer cylinder with adhesives so that both ends are open. There is a permeated water collecting portion on the lower end side, and the upper and lower ends of the water collecting pipe that connects the water collecting portion to the upper end side of the hollow fiber membrane are fixed to the outer cylinder by the adhesive, and holes for air scrubbing are opened. In a membrane module in which the upper and lower ends of the air supply pipe are fixed to the outer cylinder by an adhesive as described above, the perforated air supply pipe is arranged in the center of the outer cylinder, and the water collection pipe is radial to the perforated air supply pipe. It is characterized in that the outer cylinders are connected in a columnar arrangement by a connecting member and the perforated air pipes are used in communication by a communicating member, and the perforated holes are formed in each module. A partition can be provided in the middle of the air supply pipe.
【０００８】[0008]
【作用】孔開き送気管においては、機械的強度が低い
が、保護筒の中央位置、即ち、曲げ歪並びに捩じれ歪が
実質上、零の位置に配設されているから、孔開き送気管
の破損を防止できる。In the perforated air pipe, the mechanical strength is low, but since it is arranged at the central position of the protective cylinder, that is, at the position where bending strain and torsional strain are substantially zero, the perforated air pipe is Can prevent damage.
【０００９】また、集水管が孔開き送気管の周囲に放射
状に配設されているから、曲げモ−メント並びに捩じれ
モ−メントに対する集水管の断面二次モ−メントを大に
でき、モジュ−ルの曲げ変形並びに捩じれ変形を小さく
できる。Further, since the water collecting pipe is radially arranged around the perforated air feeding pipe, the cross sectional secondary moment of the water collecting pipe with respect to the bending moment and the twisting moment can be increased, and the module is provided. Bending deformation and twisting deformation of the cable can be reduced.
【００１０】[0010]
【実施例】以下、図面により本発明の実施例を説明す
る。図１の（イ）は本発明の実施例を示す断面説明図、
図１の（ロ）は図１の（イ）におけるロ−ロ断面図であ
る。図１の（イ）並びに図１の（ロ）において、１は断
面円形の保護筒、１１は保護筒に設けた原水供給孔であ
る。２は保護筒内に収納した中空糸膜、３は保護筒の中
央に配設した孔開き送気管、４孔開き送気管３の周りに
放射状に配設した集水管であり、曲げ、並びに捩じれに
対する断面二次モ−メントの大なる断面形状、例えば、
四角形としてある。Embodiments of the present invention will be described below with reference to the drawings. 1A is a sectional explanatory view showing an embodiment of the present invention,
FIG. 1B is a sectional view taken along the line A-B of FIG. In (a) of FIG. 1 and (b) of FIG. 1, 1 is a protective cylinder having a circular cross section, and 11 is a raw water supply hole provided in the protective cylinder. Reference numeral 2 is a hollow fiber membrane housed in a protective cylinder, 3 is a perforated air pipe arranged in the center of the protective cylinder, 4 is a water collection pipe radially arranged around the perforated air pipe 3, and is bent and twisted. A large cross-sectional shape of the cross-section secondary moment, for example,
It is as a rectangle.
【００１１】５１は保護筒１の上端に設けた接着剤層、
５２は保護筒１の下端に設けた接着剤層であり、中空糸
膜２、集水管４の各端を各端開口状態で保護筒１に水密
に固定してある。また、孔開き送気管３に対しては、上
側モジュ−ルの孔開き送気管上端３０は閉塞し、同孔開
き送気管の下端300並びに下側モジュ−ルの両端を開口
状態にして同上接着層により保護筒に水密に固定してあ
る。３１は各孔開き送気管３の途中に設けた仕切であ
る。Reference numeral 51 denotes an adhesive layer provided on the upper end of the protective cylinder 1,
Reference numeral 52 denotes an adhesive layer provided on the lower end of the protective cylinder 1, and the hollow fiber membrane 2 and the water collecting pipe 4 are watertightly fixed to the protective cylinder 1 with each end open. Further, with respect to the perforated air supply pipe 3, the upper end 30 of the perforated air supply pipe of the upper module is closed, and the lower end 300 of the perforated air supply pipe and both ends of the lower module are opened to bond the same. It is watertightly fixed to the protective cylinder by the layer. Reference numeral 31 is a partition provided in the middle of each air feed pipe 3 with holes.
【００１２】６は圧力容器（図示せず）を上側の透過液
室６１と下側の原水室６２とに仕切った管板であり、上
側モジュ−ルの上端にヘッダ−７１を水密に取着し、こ
のヘッダ−７１，０リング７２，固定板７３等によって
モジュ−ルを管板６に懸垂支持してある。Reference numeral 6 denotes a tube plate which divides a pressure vessel (not shown) into an upper permeate chamber 61 and a lower raw water chamber 62, and a header 71 is attached to the upper end of the upper module in a watertight manner. The module is suspended and supported on the tube sheet 6 by the header 71, the O-ring 72, the fixing plate 73 and the like.
【００１３】８１は上下モジュ−ルの保護筒１，１間を
接続した接続筒であり、内部に集水室ａを備えている。
８２は上下モジュ−ルの孔開き送気管３，３相互を接続
した連通管である。８３は下側モジュ−ルの下端に水密
に取着したキャップであり、内部に集水室ａを備えてい
る。８４は下側モジュ−ルの孔開き送気管３の下端に気
密に差し込み接続したエア導入管であり、キャップ８３
の外部に水密に引き出してある。Reference numeral 81 is a connecting cylinder connecting the protective cylinders 1 and 1 of the upper and lower modules, and has a water collecting chamber a therein.
Reference numeral 82 is a communication pipe that connects the upper and lower modular perforated air supply pipes 3 and 3. A cap 83 is attached to the lower end of the lower module in a watertight manner, and has a water collecting chamber a therein. Reference numeral 84 is an air introducing pipe that is airtightly inserted and connected to the lower end of the air feed pipe 3 having a hole in the lower module.
It is watertightly drawn to the outside.
【００１４】上記モジュ−ルの膜洗浄はエアスクラビン
グ法により行い、膜表面にスケ−ルが付着してクラッド
が形成され、濾過圧が所定値に達すると、エア導入管８
４よりエアを送入する。この送入エアは下側モジュ−ル
から孔開き送気管を経て上側モジュ−ルに送られていく
が、各モジュ−ルにおける孔開き送気管３の途中に仕切
３１を設けてあるので、送入エアが下側から上側に一直
線に素通りするのを排除でき、図１の（イ）の矢印ｂで
示すように、送入エアを各モジュ−ルの保護筒１内の空
間によく迂回させることができる。従って、各モジュ−
ルの保護筒内での上昇気泡の発生、この上昇気泡に基づ
く対流の発生をよく保障でき、エアスクラビング法によ
る膜洗浄を良好に行い得る。The membrane cleaning of the above module is carried out by an air scrubbing method. When the scale adheres to the membrane surface to form a clad and the filtration pressure reaches a predetermined value, the air introduction pipe 8
Air is sent from 4. This inflowing air is sent from the lower module through the perforated air supply pipe to the upper module, but since the partition 31 is provided in the middle of the perforated air supply pipe 3 in each module, it is sent. It is possible to eliminate the straight passage of the incoming air from the lower side to the upper side, and as shown by the arrow b in FIG. 1 (a), the incoming air is often diverted to the space inside the protective cylinder 1 of each module. be able to. Therefore, each module
The generation of rising bubbles in the protective cylinder of the nozzle and the generation of convection due to the rising bubbles can be well ensured, and the film cleaning by the air scrubbing method can be performed well.
【００１５】[0015]
【発明の効果】本発明の縦型中空糸膜モジュ−ルは上述
した通りの構成であり、エアスクラビング法による膜洗
浄時に曲げモ−メントまたは捩じりモ−メントを受けて
も、孔開き送気管を曲げ歪並びに捩じれ歪が実質上零の
部位であるモジュ−ルの中央に配設してあるから、孔開
き送気管の機械的強度が低くても孔開き送気管の破損を
防止できる。The vertical hollow fiber membrane module of the present invention is constructed as described above, and even if it receives a bending moment or a twisting moment during membrane cleaning by the air scrubbing method, it is perforated. Since the air supply pipe is arranged in the center of the module where the bending strain and the torsional strain are substantially zero, the perforation air supply pipe can be prevented from being damaged even if the mechanical strength of the perforation air supply pipe is low. ..
【００１６】また、集水管を孔開き送気管を中心にして
放射状に配設して分散させてあるから、曲げ並びに捩じ
れに対する集水管の断面二次モ−メントを大きくでき、
モジュ−ルの曲げ変形並びに捩じれ変形を少なくでき、
機械的強度の低い膜を安定に保持できる。Further, since the water collecting pipes are perforated and arranged radially around the air feeding pipe to be dispersed, the secondary moment of the cross-section of the water collecting pipe against bending and twisting can be increased,
Bending deformation and twisting deformation of the module can be reduced,
A film having low mechanical strength can be stably held.
【図１】図１の（イ）は本発明の実施例を示す断面図、
図１の（ロ）は図１の（イ）におけるロ−ロ断面図であ
る。FIG. 1A is a sectional view showing an embodiment of the present invention,
FIG. 1B is a sectional view taken along the line A-B of FIG.
【図２】従来例を示す断面図である。FIG. 2 is a sectional view showing a conventional example.
１ 保護筒 ２ 中空糸膜 ３ 孔開け送気管 ３１ 仕切 ４ 集水管 ５１ 接着剤層 ５２ 接着剤層 ８１ 接続筒 ８２ 連通管 ａ 集水室 1 Protective Cylinder 2 Hollow Fiber Membrane 3 Perforated Air Pipe 31 Partition 4 Water Collection Pipe 51 Adhesive Layer 52 Adhesive Layer 81 Connection Cylinder 82 Communication Pipe a Water Collection Chamber
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中込 敬祐 大阪府茨木市下穂積１丁目１番２号 日東 電工株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keisuke Nakagome 1-2-1, Shimohozumi, Ibaraki City, Osaka Prefecture Nitto Denko Corporation
Claims (2)
接着剤で両端開口の状態で固定され、中空糸膜の下端側
に透過液の集水部が存在し、該集水部を中空糸膜上端側
に連通する集水管の上下端が上記接着剤によって上記外
筒に固定され、エアスクラビング用空気の孔開き送気管
の上下端が同上接着剤によって上記外筒に固定されてな
る膜モジュ−ルにおいて、上記孔開き送気管が外筒の中
央に配設され、この孔開き送気管に対し集水管が放射状
に配設されていることを特徴とする縦型中空糸膜モジュ
−ル。1. A plurality of hollow fiber membranes are fixed in the outer cylinder at both ends with adhesives in a state of opening both ends, and a permeate collecting portion is present on the lower end side of the hollow fiber membranes. The upper and lower ends of the water collecting pipe communicating with the upper end side of the hollow fiber membrane are fixed to the outer cylinder by the adhesive, and the upper and lower ends of the air scrubbing air perforated air pipe are fixed to the outer cylinder by the adhesive. In the membrane module, the vertical hollow fiber membrane module is characterized in that the perforated air feed pipe is arranged in the center of the outer cylinder, and the water collection pipes are radially arranged with respect to the perforated air feed pipe. -Le.
縦列配置され、外筒間が接続部材によって接続されると
共に孔開き送気管が連通部材により連通され、各モジュ
−ルにおける孔開き送気管の途中に仕切が設けられてい
ることを特徴とする縦型中空糸膜モジュ−ル。2. The vertical hollow fiber membrane modules according to claim 1 are arranged in tandem, the outer cylinders are connected by a connecting member and the perforated air pipes are connected by a connecting member, and A vertical hollow fiber membrane module, characterized in that a partition is provided in the middle of the perforated air pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11222592A JPH05285348A (en) | 1992-04-04 | 1992-04-04 | Vertical type hollow fiber membrane module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11222592A JPH05285348A (en) | 1992-04-04 | 1992-04-04 | Vertical type hollow fiber membrane module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05285348A true JPH05285348A (en) | 1993-11-02 |
Family
ID=14581388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11222592A Pending JPH05285348A (en) | 1992-04-04 | 1992-04-04 | Vertical type hollow fiber membrane module |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05285348A (en) |
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|---|---|---|---|---|
| US6964741B2 (en) | 1995-08-11 | 2005-11-15 | Zenon Environmental Inc. | Apparatus for withdrawing permeate using an immersed vertical skein of hollow fiber membranes |
| US7087173B2 (en) | 1995-08-11 | 2006-08-08 | Zenon Environmental Inc. | Inverted cavity aerator for membrane module |
| USRE39294E1 (en) | 1995-08-11 | 2006-09-19 | Zenon Environmental Inc. | Vertical skein of hollow fiber membranes and method of maintaining clean fiber surfaces while filtering a substrate to withdraw a permeate |
| US7160463B2 (en) | 2002-06-18 | 2007-01-09 | U.S. Filter Wastewater Group, Inc. | Methods of minimizing the effect of integrity loss in hollow fibre membrane modules |
| US7198721B2 (en) | 1998-10-09 | 2007-04-03 | Zenon Technology Partnership | Cyclic aeration system for submerged membrane modules |
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| JP2010527773A (en) * | 2007-05-29 | 2010-08-19 | シーメンス ウォーター テクノロジース コーポレイション | Membrane cleaning using an air lift pump |
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| US8956464B2 (en) | 2009-06-11 | 2015-02-17 | Evoqua Water Technologies Llc | Method of cleaning membranes |
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-
1992
- 1992-04-04 JP JP11222592A patent/JPH05285348A/en active Pending
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| US11065569B2 (en) | 2011-09-30 | 2021-07-20 | Rohm And Haas Electronic Materials Singapore Pte. Ltd. | Manifold arrangement |
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| US9533261B2 (en) | 2012-06-28 | 2017-01-03 | Evoqua Water Technologies Llc | Potting method |
| US9868834B2 (en) | 2012-09-14 | 2018-01-16 | Evoqua Water Technologies Llc | Polymer blend for membranes |
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