JPH02277528A - Backwash device of filter having hollow fiber membrane - Google Patents
Backwash device of filter having hollow fiber membraneInfo
- Publication number
- JPH02277528A JPH02277528A JP9890389A JP9890389A JPH02277528A JP H02277528 A JPH02277528 A JP H02277528A JP 9890389 A JP9890389 A JP 9890389A JP 9890389 A JP9890389 A JP 9890389A JP H02277528 A JPH02277528 A JP H02277528A
- Authority
- JP
- Japan
- Prior art keywords
- backwash
- hollow fiber
- fiber membrane
- backwashing
- valve
- 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.)
- Granted
Links
- 239000012528 membrane Substances 0.000 title claims description 82
- 239000012510 hollow fiber Substances 0.000 title claims description 81
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000007788 liquid Substances 0.000 claims abstract description 52
- 238000011001 backwashing Methods 0.000 claims description 44
- 238000005374 membrane filtration Methods 0.000 claims 1
- 230000005587 bubbling Effects 0.000 abstract description 31
- 230000001681 protective effect Effects 0.000 abstract description 15
- 239000012535 impurity Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 8
- 239000010419 fine particle Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002901 radioactive waste Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000001223 reverse osmosis Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229940035289 tobi Drugs 0.000 description 1
- NLVFBUXFDBBNBW-PBSUHMDJSA-N tobramycin Chemical compound N[C@@H]1C[C@H](O)[C@@H](CN)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O[C@@H]2[C@@H]([C@@H](N)[C@H](O)[C@@H](CO)O2)O)[C@H](N)C[C@@H]1N NLVFBUXFDBBNBW-PBSUHMDJSA-N 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は液体中の不純物の除去等に用いられる効率的な
中空糸膜ろ過器の逆洗装置に関する。Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to an efficient backwashing device for a hollow fiber membrane filter used for removing impurities in a liquid.
（従来の技術）
一般に中空糸膜はその外径が０．３〜３順程度で微細な
孔を有する中空状の繊維膜であり、単位容積光たりの膜
面積を大きくとることができる。また、外径が小さく耐
圧性に優れているので精密ｒ濾過用、限外濾過用、逆浸
透用、逆浸透用などのろ過器用として電子工業、医学、
原子力等の分野で純水製造、排水処理等に広く活用され
ている。(Prior Art) Generally, a hollow fiber membrane is a hollow fiber membrane having an outer diameter of about 0.3 to 3 mm and having fine pores, and can have a large membrane area per unit volume of light. In addition, because of its small outer diameter and excellent pressure resistance, it can be used in the electronic industry, medicine, etc. for precision filtration, ultrafiltration, reverse osmosis, reverse osmosis, etc.
It is widely used in fields such as nuclear power for pure water production and wastewater treatment.
中空糸膜ろ過器は第５図に示したように細長い多数本の
中空糸膜２を０字状に折り曲げてその中空糸膜２の両端
を結束して固めた多数本の中空糸膜モジュール１を管板
３に取着して保持し、該モジュール１の外側を保護管４
で覆い、Ｍ５．５ａを有する胴６内に収納したものから
なっている。As shown in Fig. 5, the hollow fiber membrane filter is made up of a large number of hollow fiber membrane modules 1 that are made by bending a large number of elongated hollow fiber membranes 2 into a 0-shape and binding and solidifying both ends of the hollow fiber membranes 2. is attached to and held on the tube plate 3, and the outside of the module 1 is attached to the protective tube 4.
It consists of a cylinder 6 covered with M5.5a and housed in a cylinder 6.
保護管４の上部にはベント穴１８を有している。上部蓋
５には逆洗空気弁２６を有する逆洗空気ライン１３と出
口弁２５を有する液出口ライン９が接続されている。一
方、下部ｉ５ａには液へ口弁２４を有する液入口ライン
８と逆洗水排出口１０アよび逆洗水排出弁１７を有する
逆洗水排出ライン１２が設けられている。ざらに、胴６
の上部側面には逆洗ベントライン１１および逆洗ベント
弁１６が接続され、胴６の下部側面にはバブリング空気
ライン１４およびバブリング空気弁２７が接続されてい
る。The protective tube 4 has a vent hole 18 in its upper part. A backwash air line 13 having a backwash air valve 26 and a liquid outlet line 9 having an outlet valve 25 are connected to the upper lid 5 . On the other hand, a liquid inlet line 8 having a liquid inlet valve 24, a backwash water discharge line 12 having a backwash water discharge port 10a and a backwash water discharge valve 17 are provided in the lower part i5a. Zara, torso 6
A backwash vent line 11 and a backwash vent valve 16 are connected to the upper side of the body 6, and a bubbling air line 14 and a bubbling air valve 27 are connected to the lower side of the body 6.
ところで、このような中空糸膜ろ過器において、効率的
な逆洗方法を見出すことは中空糸膜ろ過器の適用範囲を
拡大する上で非常に重要であり、種々の発明・考案がな
されている。例えば、特開昭５３１０８８８２号公報に
は圧力空気による逆洗で付着微粒子を剥離するとともに
中空糸膜を（辰勅させて付着微粒子を除去する手段が開
示されている。By the way, finding an efficient backwashing method for such hollow fiber membrane filters is very important in expanding the range of applications of hollow fiber membrane filters, and various inventions and ideas have been made. . For example, Japanese Patent Application Laid-Open No. 53108882 discloses a means for peeling off adhered fine particles by backwashing with pressurized air and also removing the adhered fine particles by forcing the hollow fiber membrane to move.
また特開昭６０−１９００２号公報には圧力空気による
逆洗で付着微粒子を剥離するとともに中空糸膜を振動さ
せるための空気を該中空糸膜の側方または下方から発生
させ付着微粒子を除去する手段が開示されている。Furthermore, JP-A-60-19002 discloses that adhered fine particles are peeled off by backwashing with pressurized air, and air for vibrating the hollow fiber membrane is generated from the side or below of the hollow fiber membrane to remove the adhered fine particles. means are disclosed.
（発明が解決しようとする課題）
しかしながら、特開昭５３−１０８８８２号および特開
昭６０−１９００２号公報では胴内の液位の挙動につい
ては記述されていない。これらの手段により逆洗を実施
すると逆洗中に胴内の液位が次第に減少するという現象
が生じる。これによって中空糸膜モジュール上部が空気
中に露出することとなり、空気により中空糸膜を振動さ
せる効果が半減するのみならず、剥離した付着微粒子が
保護管内で滞留し液上面近傍で中空糸膜に再び付着する
現象を生じる。また、中空糸膜の種類によっては中空糸
膜が空気中にざらされることによって中空糸膜の劣化の
一因となる課題が生じる。(Problems to be Solved by the Invention) However, Japanese Patent Laid-Open No. 53-108882 and Japanese Patent Laid-Open No. 60-19002 do not describe the behavior of the liquid level in the cylinder. When backwashing is carried out by these means, a phenomenon occurs in which the liquid level in the cylinder gradually decreases during backwashing. As a result, the upper part of the hollow fiber membrane module is exposed to the air, which not only halves the effect of vibrating the hollow fiber membrane with air, but also allows the peeled off adhering particles to stay in the protective tube and damage the hollow fiber membrane near the top of the liquid. This causes the phenomenon of re-adhesion. Further, depending on the type of hollow fiber membrane, there arises a problem that the hollow fiber membrane is exposed to air, which causes deterioration of the hollow fiber membrane.
ざらに、これらの逆洗手段を効果的に実施するには、逆
洗初期に逆洗空気によって押し出される逆流水の流速を
一定以上に取ることが必要でおり、この逆洗水の圧損に
より、ベントノズルの口径が選定されるので大口径のベ
ントノズルを設けることが必要となり、中空糸膜ろ過器
が大型化する課題などがある。In general, in order to effectively implement these backwashing methods, it is necessary to maintain a flow rate of the backflow water pushed out by the backwash air at a certain level or higher in the initial stage of backwashing, and the pressure loss of this backwash water causes Since the diameter of the vent nozzle is selected, it is necessary to provide a vent nozzle with a large diameter, which poses the problem of increasing the size of the hollow fiber membrane filter.
本発明は上記課題を解決するためになされたもので、逆
洗作業時の胴内の液位低下を防止し、かつ逆洗ベントラ
インの大型化を防止して逆洗効率を向上させた中空糸膜
ろ過器の逆洗装置を提供することにおる。The present invention was made in order to solve the above problems, and is a hollow tube that prevents the liquid level from decreasing inside the cylinder during backwashing work, prevents the backwash vent line from becoming large, and improves backwash efficiency. Our objective is to provide a backwashing device for thread membrane filters.
［発明の構成］
（課題を解決するための手段）
本発明は少なくとも１本の多孔質中空糸膜モジュールと
、この中空糸膜モジュールを保持する管板と、この管板
に接続し該中空糸膜モジュール１本毎に該中空糸膜モジ
ュールを保護するための保護管と、この保護管の外側を
覆う胴と、この胴に接続された液入口、液出口、逆洗水
出口およびベントの機能を有するノズルとからなり、逆
洗手段として空気を用いる中空糸膜ろ過器の逆洗装置に
おいて、前記胴内の液位を一定以下に低下させないよう
に構成してなることを特徴とする。[Structure of the Invention] (Means for Solving the Problems) The present invention comprises at least one porous hollow fiber membrane module, a tube plate for holding the hollow fiber membrane module, and a tube plate connected to the tube plate and provided with a hollow fiber membrane module connected to the tube plate. Each membrane module has a protective tube for protecting the hollow fiber membrane module, a body that covers the outside of this protective tube, and functions of a liquid inlet, liquid outlet, backwash water outlet, and vent connected to this body. A backwashing device for a hollow fiber membrane filter using air as a backwashing means, characterized in that the liquid level in the body is not lowered below a certain level.
（作 用）
バブリング時のろ過器の水位ｈ１ と、逆洗ベントライ
ンの管内面最上部の床面からの高ざｈ２とを等しく（ｈ
１＝ｈ２）し、胴の上部と逆洗ベントラインとの間に連
通管を設けることによって胴内の液位の低下を防止する
ことができる。また胴に取着した逆洗ベントを逆洗水排
出ラインと兼用でき、かつ胴のベントはバブリング時の
空気排出のみとなり、小口径となり、また連通管を兼用
することができる。(Function) The water level h1 of the filter during bubbling and the height h2 of the top of the inner surface of the backwash vent line from the floor are made equal (h
1=h2), and by providing a communication pipe between the upper part of the shell and the backwash vent line, it is possible to prevent the liquid level in the shell from decreasing. Also, the backwash vent attached to the body can be used as a backwash water discharge line, and the body vent only discharges air during bubbling, has a small diameter, and can also be used as a communication pipe.
さらにサイホンブレーク弁を設けることによってサイホ
ン現象を防止することができる。Furthermore, the siphon phenomenon can be prevented by providing a siphon break valve.
（実施例）
本発明に係る中空糸膜ろ過器の逆洗装置の第１の実施例
を第１図を用いて説明する。(Example) A first example of a backwashing device for a hollow fiber membrane filter according to the present invention will be described with reference to FIG.
第１図において符号１は中空糸膜モジュールを示し、こ
れは多数本の中空糸膜２かそれぞれの両端を上方に向け
０字型に折り返されて集束され、上部基部を樹脂で固定
されて、構成されている。この中空糸膜モジュール１は
管板３から管板３と液密に垂設されており、各中空糸膜
モジュール１を覆うように保護管４が管板３に取り付け
られている。この保護管４の上部にはベント穴１８が設
けられている。中空糸膜ろ過器は液入口８と連通管７と
逆洗水排出口１０とバブリング空気人口１４を有する胴
６と液出口９を有するＭ５により管板３と中空糸膜モジ
ュール１が覆われる形で成り立っている。ざらに、胴６
の底部に設けられた逆洗水排出口１０は逆洗ベントライ
ン１１と逆洗水排出ライン１２に分岐し、逆洗ベントラ
イン１１の管内面最上部は床面からｈ２の高さにある。In FIG. 1, reference numeral 1 indicates a hollow fiber membrane module, in which a large number of hollow fiber membranes 2 are folded back into a 0-shape with both ends facing upward, and the upper base is fixed with resin. It is configured. The hollow fiber membrane modules 1 are vertically installed in a fluid-tight manner from tube sheet 3 to tube sheet 3, and protective tubes 4 are attached to tube sheet 3 so as to cover each hollow fiber membrane module 1. A vent hole 18 is provided in the upper part of the protective tube 4. The hollow fiber membrane filter has a structure in which a tube plate 3 and a hollow fiber membrane module 1 are covered by a body 6 having a liquid inlet 8, a communication pipe 7, a backwash water outlet 10, a bubbling air port 14, and an M5 having a liquid outlet 9. It consists of Zara, torso 6
A backwash water outlet 10 provided at the bottom of the backwash water outlet 10 branches into a backwash vent line 11 and a backwash water discharge line 12, and the top of the inner surface of the backwash vent line 11 is at a height of h2 from the floor surface.
バブリング時のろ過器水位ｈ１ との関係はｈｌ ＝ｉ
１２となっており、各々に逆洗ベント弁１６と逆洗水排
出弁１７が設けられている。The relationship with the filter water level h1 during bubbling is hl = i
12, each of which is provided with a backwash vent valve 16 and a backwash water discharge valve 17.
中空糸膜ろ過器のＦｇ４６の上部と逆洗ベントライン１
１を接続する連通管７には連通弁１５が設けられている
。Upper part of Fg46 of hollow fiber membrane filter and backwash vent line 1
A communication valve 15 is provided in the communication pipe 7 connecting the two.
このような中空糸膜ろ過器で逆洗を実施する場合はまず
液へ口弁２４と液出口弁２５を閉じ、次に、逆洗空気弁
２６を開き中空糸膜ろ過器用６の１５に貯預されている
水を加圧する。そして、逆洗ベント弁１６を開き、この
水を勢いよく逆流させる。その後、バブリング空気弁２
７を開き、中空糸膜モジュール１の下部にバブリング空
気を入れた状態を一定時間継続することによって逆洗を
行う。When performing backwashing with such a hollow fiber membrane filter, first close the liquid inlet valve 24 and the liquid outlet valve 25, then open the backwash air valve 26 and store it in 15 of the hollow fiber membrane filter 6. Pressurize the stored water. Then, the backwash vent valve 16 is opened to cause this water to flow back vigorously. Then the bubbling air valve 2
7 is opened and bubbling air is introduced into the lower part of the hollow fiber membrane module 1 for a certain period of time to perform backwashing.
逆洗初期には第２図に示すように保護管４の中でバブリ
ング空気の気泡２２の作用によっていわゆる空気ポンプ
状態となり、保護管４の中の水２３は保護管４のベント
穴１８から勢いよく噴き出し保護管４の水が循環状態と
なる。これによって中空糸膜モジュール１の上部の樹脂
で中空糸膜２が固定された部分の下端部すなわち中空糸
ｌｌ！２の付は根部が洗浄されると共に保護管４内に中
空糸膜２から剥離した付着不純物が滞留し中空糸膜２に
再付着することはない。In the early stage of backwashing, as shown in FIG. 2, the protection tube 4 becomes in a so-called air pump state due to the action of bubbling air bubbles 22, and the water 23 in the protection tube 4 is pumped out of the vent hole 18 of the protection tube 4. The water in the protection tube 4 is well-spouted and is in a circulating state. As a result, the lower end of the hollow fiber membrane 2 is fixed with the resin at the upper part of the hollow fiber membrane module 1, that is, the hollow fiber ll! 2, the root portion is cleaned and the adhering impurities separated from the hollow fiber membrane 2 remain in the protective tube 4 and do not adhere to the hollow fiber membrane 2 again.
しかしながら、時間が経つとともに胴６内の液位が徐々
に下がり保護管４のベント穴１８から勢いよく噴き出し
ていた水は徐々にその勢いがなくなり第３図のようにな
る。こうなると空気ポンプ状態でなくなり、中空糸膜２
の付は根部が洗浄されなくなるとともに保護管４内に中
空糸膜２から剥離した付着不純物が滞留し中空糸膜２に
再付着することになる。However, as time passes, the liquid level in the shell 6 gradually decreases, and the water that was spouting out from the vent hole 18 of the protection tube 4 gradually loses its force, resulting in a state as shown in FIG. 3. If this happens, the air pump state will no longer occur, and the hollow fiber membrane 2
At the same time, the root part is no longer cleaned, and adhering impurities separated from the hollow fiber membrane 2 remain in the protective tube 4 and re-adhere to the hollow fiber membrane 2.
このことは、空気バブリング時間（逆洗時間）が例えば
３０分間あったとしても胴６内の液位低下による空気ポ
ンプ状態喪失以降は、逆洗効果がなくなり、その時間が
有効に生かされていないばかりでなく、面述のように逆
洗効果としてはむしろ逆効果となっているものと考えら
れる。この状態が起きる原因は、第２図の状態で保護管
４のベント穴１８から勢いよく噴き出した水が、第５図
に示す従来の実施例の逆洗ベントライン１１に流入する
ことによって発生する。This means that even if the air bubbling time (backwash time) is, for example, 30 minutes, after the air pump status is lost due to a drop in the liquid level in the cylinder 6, the backwash effect disappears, and that time is not effectively utilized. Not only that, but as mentioned above, it is thought that the backwashing effect actually has the opposite effect. This condition occurs because the water that was forcefully jetted out from the vent hole 18 of the protection tube 4 in the condition shown in FIG. 2 flows into the backwash vent line 11 of the conventional embodiment shown in FIG. .
本実施例では、逆洗水排出口１０をろ過器底部から設け
たことによって逆洗初期の逆洗空気による蓋５に溜って
いる水は中空糸膜２を逆流し、ろ過器の底部から逆洗水
排出口１０．逆洗ベントライン１１を通り排出される。In this embodiment, by providing the backwash water outlet 10 from the bottom of the filter, the water accumulated in the lid 5 due to the backwash air at the initial stage of backwashing flows back through the hollow fiber membrane 2, and is then backflowed from the bottom of the filter. Washing water outlet 10. It is discharged through the backwash vent line 11.
逆洗ベントライン１１の管内面の最上部をろ過器のバブ
リング時に必要液位と同じ高さに設置したことによって
理想的にはサイホン現象が発生しない限り、ろ過器の液
位はバブリング時に必要な液位に確実にコントロールさ
れた状態で止まる。この場合、連通弁１５を逆洗ベント
弁１６と同時に開くと、サイホン現象を防ぎ、ろ過器液
位はバブリング時必要液位に正確にコントロールされた
状態で止まる。さらに、バブリングを開始するとバブリ
ング空気の気泡２２の分だけは水が排出されるが、それ
以下に液位が低下することはない。Ideally, unless a siphon phenomenon occurs by installing the top of the inner surface of the backwash vent line 11 at the same height as the liquid level required during bubbling of the filter, the liquid level of the filter should be at the same level as the liquid level required during bubbling. Stops while the liquid level is reliably controlled. In this case, opening the communication valve 15 at the same time as the backwash vent valve 16 prevents the siphon phenomenon and keeps the filter liquid level precisely controlled to the required liquid level during bubbling. Further, when bubbling is started, water is discharged by the amount of bubbles 22 of bubbling air, but the liquid level does not drop below that level.
これによって空気ポンプ状態が常に維持されて逆洗時間
全体が有効に使われることになり、逆洗効率が向上する
。逆洗効率の向上は中空糸膜モジュールの寿命延・長に
寄与するばかりでなく、例えば原子力発電所の放射性廃
液または復水の処理に用いるような場合には特に有効で
定期点検時の作業員の被曝低減にもつながる。As a result, the air pump condition is always maintained and the entire backwashing time is used effectively, improving backwashing efficiency. Improving backwashing efficiency not only contributes to extending the lifespan of hollow fiber membrane modules, but it is also particularly effective when used to treat radioactive waste liquid or condensate at nuclear power plants, for example. It also leads to a reduction in radiation exposure.
次に、本発明の第２の実施例について第４図を用いて説
明する。本発明の第１図に示すものと同一のものについ
ては同じ符号で示す。Next, a second embodiment of the present invention will be described using FIG. 4. Components that are the same as those shown in FIG. 1 of the present invention are designated by the same reference numerals.
図において、符号１は中空糸膜モジュールを示し、これ
は多数本の中空糸膜２がそれぞれの両端を上方に向け０
字型に折り返されて集束され、上部基部を樹脂で固定さ
れている。この中空糸膜モジュール１は管板３から管板
３と液密に垂設されており、各中空糸膜モジュール１を
覆うように保護管４が管板３に取り付けられている。こ
の保護管４の上部にはベント穴１８が設けられている。In the figure, reference numeral 1 indicates a hollow fiber membrane module, in which a large number of hollow fiber membranes 2 are arranged with both ends of each facing upward.
It is folded back into a shape and bundled, and the upper base is fixed with resin. The hollow fiber membrane modules 1 are vertically installed in a fluid-tight manner from tube sheet 3 to tube sheet 3, and protective tubes 4 are attached to tube sheet 3 so as to cover each hollow fiber membrane module 1. A vent hole 18 is provided in the upper part of the protective tube 4.
そして、中空糸膜ろ過器は液入口８と連通管７と逆洗水
出口１０とバブリング空気人口１４を有する胴部６と液
出口９を有する蓋部５により管板３と中空糸膜モジュー
ル１が覆われる形で成り立っている。The hollow fiber membrane filter is constructed by connecting a tube plate 3 and a hollow fiber membrane module 1 to a body part 6 having a liquid inlet 8, a communication pipe 7, a backwash water outlet 10, a bubbling air port 14, and a lid part 5 having a liquid outlet 9. It is constructed in such a way that it is covered.
ざらに、胴部６の底部に設けられた逆洗水排出口１０は
逆洗ベントライン１１と逆洗水排出ライン１２に分岐し
、逆洗ベントライン１１の管内面最下部は床面からｈ２
の高さにある。バブリング時のろ過器水位ｈ１ との関
係は、ｈｌ ＝ｈ２となっており、各々に逆洗ベント弁
１６と逆洗水排出弁１７が設けられている。Roughly speaking, the backwash water outlet 10 provided at the bottom of the body 6 branches into a backwash vent line 11 and a backwash water discharge line 12, and the lowest part of the inner surface of the backwash vent line 11 is located at h2 from the floor surface.
It is located at the height of The relationship with the filter water level h1 during bubbling is hl = h2, and each is provided with a backwash vent valve 16 and a backwash water discharge valve 17.
逆洗ベントライン１１にはサイホンブレーク弁１９が設
けられている。このような中空糸膜ろ過器で逆洗を実施
する場合はまず、液大口弁２４と液出口弁２５を閉じ、
次に、逆洗空気弁２６を開き中空糸膜ろ過器の蓋部５に
貯留されている水を加圧する。A siphon break valve 19 is provided in the backwash vent line 11. When performing backwashing with such a hollow fiber membrane filter, first close the liquid outlet valve 24 and the liquid outlet valve 25,
Next, the backwash air valve 26 is opened to pressurize the water stored in the lid 5 of the hollow fiber membrane filter.
そして、逆洗ベント弁１６を開き、この水を勢いよく逆
流させる。その後、バブリグ空気弁２７を開き、中空糸
膜モジュール下部にバブリング空気を入れた状態を一定
時間継続することによって逆洗を行う。Then, the backwash vent valve 16 is opened to cause this water to flow back vigorously. Thereafter, backwashing is performed by opening the bubbling air valve 27 and continuing to introduce bubbling air into the lower part of the hollow fiber membrane module for a certain period of time.
逆洗初期には第２図に示すように保護管４の中でバブリ
ング空気の気泡２２の作用によっていわゆる空気ポンプ
状態となり、保護管４内の水２３は保護筒４のベント穴
１６から勢いよく噴き出し保護筒４の中の水が循環状態
となる。これによって中空糸膜モジュール上部の樹脂で
中空糸膜２が固定された部分の下端部すなわち中空糸膜
２の付は根部が洗浄されるとともに保護管内に中空糸膜
２から剥離した付着不純物が滞留し中空糸膜２に再付着
することはない。In the early stage of backwashing, as shown in FIG. 2, the protection tube 4 becomes in a so-called air pump state due to the action of bubbling air bubbles 22, and the water 23 in the protection tube 4 is forced out from the vent hole 16 of the protection tube 4. The water in the spout protection tube 4 is in a circulating state. As a result, the lower end of the part where the hollow fiber membrane 2 is fixed with the resin on the upper part of the hollow fiber membrane module, that is, the root of the hollow fiber membrane 2, is cleaned, and the attached impurities separated from the hollow fiber membrane 2 remain in the protective tube. However, it does not adhere to the hollow fiber membrane 2 again.
しかしながら、時間が経つとともに胴６内の液位が徐々
に下がり保護管４のベント穴１８から勢いよく噴き出し
ていた水は徐々にその勢いがなくなり第３図のようにな
る。こうなると空気ポンプ状態でなくなり、中空糸膜２
の付は根部が洗浄されなくなると共に保護管４内に中空
糸膜２から剥離した付着不純物が滞留し中空糸膜２に再
付着することとなる。However, as time passes, the liquid level in the shell 6 gradually decreases, and the water that was spouting out from the vent hole 18 of the protection tube 4 gradually loses its force, resulting in a state as shown in FIG. 3. If this happens, the air pump state will no longer occur, and the hollow fiber membrane 2
In this case, the root part is no longer cleaned, and the adhering impurities separated from the hollow fiber membrane 2 remain in the protective tube 4 and re-adhere to the hollow fiber membrane 2.
このことは空気バブリング時間（逆洗時間）が例えば３
０分間あったとしても、ＷＡＧ内の液位低下による空気
ポンプ状態喪失以降は逆洗効果がなくなり、その時間が
有効に生かされていないばかりでなく、前述のように逆
洗効果としてはむしろ逆効果となっているものと考えら
れる。この状態が起きる原因は、第２図の状態で保護管
４のベント穴１８から勢いよく噴き出した水が第５図に
示す従来の実施例の逆洗ベントライン１１に流入するこ
とによって発生する。This means that the air bubbling time (backwash time) is, for example, 3
Even if there is 0 minutes, the backwashing effect disappears after the air pump status is lost due to the drop in the liquid level in the WAG, and not only is that time not effectively utilized, but as mentioned above, the backwashing effect is actually the opposite. It is thought that this is having an effect. This condition occurs because water, which is forcefully jetted out from the vent hole 18 of the protection tube 4 in the condition shown in FIG. 2, flows into the backwash vent line 11 of the conventional embodiment shown in FIG. 5.
本実施例では逆洗水排出口１０をろ過器底部から設けた
ことによって逆洗初期の逆洗空気による蓋５に溜ってい
る水は中空糸膜２を逆洗し、ろ過器底部から逆洗水排出
口１０．逆洗ベントライン１１を通り排出される。逆洗
ベントライン１１の管内面最下部をろ過器のバブリング
時必要液位と同じ高さに設置したこととサイホンブレー
ク弁１９を設けたことによってｒ濾過液位はバブリング
時必要液位に正確にコントロールされた状態で確実に止
まる。In this embodiment, by providing the backwash water outlet 10 from the bottom of the filter, the water accumulated in the lid 5 due to the backwash air at the initial stage of backwashing is backwashed to the hollow fiber membrane 2, and the water is backwashed from the bottom of the filter. Water outlet 10. It is discharged through the backwash vent line 11. By installing the lowest part of the inner surface of the backwash vent line 11 at the same height as the liquid level required for bubbling in the filter and by providing the siphon break valve 19, the filtration liquid level can be accurately adjusted to the liquid level required for bubbling. Stops reliably and in a controlled manner.
さらに、バブリングを開始するとバブリング空気の気泡
２２の分だけは水が排出されるが、それ以下に液位が低
下することはない。Further, when bubbling is started, water is discharged by the amount of bubbles 22 of bubbling air, but the liquid level does not drop below that level.
これによって空気、ポンプ状態が常に維持され逆洗時間
全体が有効に使われることになり、逆洗効率が向上する
。逆洗効率の向上は中空糸膜モジュールの寿命延長に寄
与するばかりでなく、例えば、原子力発電所の放射性廃
液または復水処理に用いるような場合には特に有用で定
期点検時の作業員の被曝低減にもつながる。This allows the air and pump conditions to be maintained at all times, allowing the entire backwashing time to be used effectively, improving backwashing efficiency. Improving backwashing efficiency not only contributes to extending the lifespan of hollow fiber membrane modules, but is also particularly useful when used, for example, in the treatment of radioactive waste liquid or condensate at nuclear power plants, reducing the exposure of workers during periodic inspections. It also leads to reduction.
［発明の効果］
本発明によれば中空糸膜ろ過器の胴内の液位が一定以下
に低下しないように構成することによって逆洗の効率向
上を図ることができ、逆洗効率の向上によって中空糸膜
の寿命を延長させることができる。また原子力発電所の
放射性廃液、復水の処理に用いるような場合には特に有
用で定期点検時の作業愚の被曝低減にもつながる。[Effects of the Invention] According to the present invention, it is possible to improve the efficiency of backwashing by configuring the hollow fiber membrane filter so that the liquid level in the body does not fall below a certain level, and by improving the backwashing efficiency. The life of the hollow fiber membrane can be extended. It is also particularly useful when used to treat radioactive waste liquid and condensate at nuclear power plants, and helps reduce radiation exposure during periodic inspections.
第１図は本発明に係る中空糸膜ろ過器の逆洗装置の第１
の実施例を示す系統図、第２図および第３図は本発明の
詳細な説明するための中空糸膜ろ過器の一部断面図、第
４図は同じく本発明に係る逆洗装置の第２の実施例を示
す系統図である。第５図は従来の中空糸膜ろ過器の逆洗
装置を示す系統図である。
１・・・中空糸膜モジュール
２・・・中空糸膜
３・・・管板
４・・・保護管
５・・・蓋
６・・・胴
７・・・連通管
８・・・液入口
９・・・液出口
１０・・・逆洗水排出口
１１・・・逆洗ベントライン
１２・・・逆洗水排出ライン
１３・・・逆洗空気ライン
１４・・・バブリング空気ライン
１５・・・連通弁
１６・・・逆洗ベント弁
１７・・・逆洗水排出弁
１８・・・ベント穴
１９・・・サイホンブレーク弁
２０・・・バブリングベントライン
２１・・・バブリングベント弁
２２・・・バブリング空気
２３・・・水
２４・・・液人口弁
２５・・・液出口弁
２６・・・逆洗空気弁
Ｌ・・・水位
（８７３３）代理人 弁理士 猪 股 祥 晃（ばか
１名）
飛１−＾２
第FIG. 1 shows a first backwashing device for a hollow fiber membrane filter according to the present invention.
FIG. 2 and FIG. 3 are partial sectional views of a hollow fiber membrane filter for explaining the present invention in detail, and FIG. 4 is a diagram showing a backwashing device according to the present invention. FIG. 2 is a system diagram showing a second embodiment. FIG. 5 is a system diagram showing a backwashing device for a conventional hollow fiber membrane filter. 1... Hollow fiber membrane module 2... Hollow fiber membrane 3... Tube plate 4... Protective tube 5... Lid 6... Body 7... Communication tube 8... Liquid inlet 9 ...Liquid outlet 10...Backwash water outlet 11...Backwash vent line 12...Backwash water discharge line 13...Backwash air line 14...Bubbling air line 15... Communication valve 16...Backwash vent valve 17...Backwash water discharge valve 18...Vent hole 19...Siphon break valve 20...Bubbling vent line 21...Bubbling vent valve 22... Bubbling air 23...Water 24...Liquid population valve 25...Liquid outlet valve 26...Backwash air valve L...Water level (8733) Agent Patent attorney Yoshiaki Inomata (Idiot)
1 person) Tobi 1-^2 No.
Claims (3)
この中空糸膜モジュールを保持する管板と、この管板に
接続し該中空糸膜モジュール１本毎に該中空糸膜モジュ
ールを保護するための保護管と、この保護管の外側を覆
う胴と、この胴に接続された液入口、液出口、逆洗水出
口およびベント機能を有するノズルとからなり、逆洗手
段として空気を用いる中空糸膜ろ過器の逆洗装置におい
て、前記胴内の液位を一定以下に低下させないように構
成してなることを特徴とする中空糸膜ろ過器の逆洗装置
。(1) at least one porous hollow fiber membrane module;
A tube sheet for holding this hollow fiber membrane module, a protection tube connected to this tube sheet to protect each hollow fiber membrane module, and a body covering the outside of this protection tube. In a backwashing device for a hollow fiber membrane filter that uses air as a backwashing means, the backwashing device includes a liquid inlet, a liquid outlet, a backwash water outlet, and a nozzle with a vent function connected to the body. 1. A backwashing device for a hollow fiber membrane filter, characterized in that the backwashing device for a hollow fiber membrane filtration device is configured so as not to lower the water level below a certain level.
する手段として、逆洗水出口ノズルを逆洗中の胴内の必
要液位以上に立ち上げかつ該ノズルと胴の上部側面との
間に連通管を設けてなることを特徴とする請求項１記載
の中空糸膜ろ過器の逆洗装置。(2) As a means to prevent the liquid level in the cylinder from falling below a certain level, the backwash water outlet nozzle is raised above the required liquid level in the cylinder during backwashing, and the nozzle and the upper side of the cylinder 2. The backwashing device for a hollow fiber membrane filter according to claim 1, further comprising a communication pipe provided between the hollow fiber membrane filters.
る手段として、逆洗水出口ノズルを逆洗中の胴内の必要
液位以上に立ち上げかつ該ノズルにサイホンブレーク弁
を設けてなることを特徴とする請求項１記載の中空糸膜
ろ過器の逆洗装置。(3) As a means to prevent the liquid level in the cylinder from falling below a certain level, the backwash water outlet nozzle is raised above the required liquid level in the cylinder during backwashing, and a siphon break valve is installed in the nozzle. The backwashing device for a hollow fiber membrane filter according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9890389A JP2856763B2 (en) | 1989-04-20 | 1989-04-20 | Backwashing device for hollow fiber membrane filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9890389A JP2856763B2 (en) | 1989-04-20 | 1989-04-20 | Backwashing device for hollow fiber membrane filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02277528A true JPH02277528A (en) | 1990-11-14 |
| JP2856763B2 JP2856763B2 (en) | 1999-02-10 |
Family
ID=14232092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9890389A Expired - Fee Related JP2856763B2 (en) | 1989-04-20 | 1989-04-20 | Backwashing device for hollow fiber membrane filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2856763B2 (en) |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0855213A2 (en) * | 1997-01-22 | 1998-07-29 | FILTERWERK MANN + HUMMEL GmbH | Device with liquid filter element containing hollow bodies |
| JP2001129369A (en) * | 1999-11-08 | 2001-05-15 | Japan Organo Co Ltd | Method for cleaning of hollow fiber membrane and hollow fiber membrane filter |
| WO2004033078A1 (en) | 2002-10-10 | 2004-04-22 | U.S. Filter Wastewater Group, Inc. | Backwash method |
| WO2012056812A1 (en) * | 2010-10-27 | 2012-05-03 | 東レ株式会社 | Hollow fiber membrane filtration device and method for washing hollow fiber membrane module |
| US8357299B2 (en) | 2005-07-12 | 2013-01-22 | Zenon Technology Partnership | Process control for an immersed membrane system |
| 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 |
| US9022224B2 (en) | 2010-09-24 | 2015-05-05 | Evoqua Water Technologies Llc | Fluid control manifold for membrane filtration system |
| US9023206B2 (en) | 2008-07-24 | 2015-05-05 | Evoqua Water Technologies Llc | Frame system for membrane filtration modules |
| 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 |
| US9764289B2 (en) | 2012-09-26 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane securement device |
| US9764288B2 (en) | 2007-04-04 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane module protection |
| 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 |
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| US10427102B2 (en) | 2013-10-02 | 2019-10-01 | Evoqua Water Technologies Llc | Method and device for repairing a membrane filtration module |
-
1989
- 1989-04-20 JP JP9890389A patent/JP2856763B2/en not_active Expired - Fee Related
Cited By (37)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0855213A2 (en) * | 1997-01-22 | 1998-07-29 | FILTERWERK MANN + HUMMEL GmbH | Device with liquid filter element containing hollow bodies |
| EP0855213A3 (en) * | 1997-01-22 | 1998-08-12 | FILTERWERK MANN + HUMMEL GmbH | Device with liquid filter element containing hollow bodies |
| JP2001129369A (en) * | 1999-11-08 | 2001-05-15 | Japan Organo Co Ltd | Method for cleaning of hollow fiber membrane and hollow fiber membrane filter |
| WO2004033078A1 (en) | 2002-10-10 | 2004-04-22 | U.S. Filter Wastewater Group, Inc. | Backwash method |
| EP1551535A1 (en) * | 2002-10-10 | 2005-07-13 | U.S. Filter Wastewater Group, Inc. | Backwash method |
| EP1551535A4 (en) * | 2002-10-10 | 2007-04-25 | Siemens Water Tech Corp | Backwash method |
| US7938966B2 (en) * | 2002-10-10 | 2011-05-10 | Siemens Water Technologies Corp. | Backwash method |
| US9675938B2 (en) | 2005-04-29 | 2017-06-13 | Evoqua Water Technologies Llc | Chemical clean for membrane filter |
| US8357299B2 (en) | 2005-07-12 | 2013-01-22 | Zenon Technology Partnership | Process control for an immersed membrane system |
| US9783434B2 (en) | 2005-07-12 | 2017-10-10 | Zenon Technology Partnership | Real-time process control for an immersed membrane filtration system using a control hierarchy of discrete-state parameter changes |
| 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 |
| US9764288B2 (en) | 2007-04-04 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane module protection |
| 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 |
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| 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 |
| CN103189129A (en) * | 2010-10-27 | 2013-07-03 | 东丽株式会社 | Hollow fiber membrane filtration device and method for washing hollow fiber membrane module |
| WO2012056812A1 (en) * | 2010-10-27 | 2012-05-03 | 東レ株式会社 | Hollow fiber membrane filtration device and method for washing hollow fiber membrane module |
| JP5821838B2 (en) * | 2010-10-27 | 2015-11-24 | 東レ株式会社 | Hollow fiber membrane filtration device and method for cleaning hollow fiber membrane module |
| US10391432B2 (en) | 2011-09-30 | 2019-08-27 | Evoqua Water Technologies Llc | Manifold arrangement |
| US9604166B2 (en) | 2011-09-30 | 2017-03-28 | Evoqua Water Technologies Llc | Manifold arrangement |
| US11065569B2 (en) | 2011-09-30 | 2021-07-20 | Rohm And Haas Electronic Materials Singapore Pte. Ltd. | 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 |
| US9962865B2 (en) | 2012-09-26 | 2018-05-08 | Evoqua Water Technologies Llc | Membrane potting methods |
| 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 |
| 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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| Publication number | Publication date |
|---|---|
| JP2856763B2 (en) | 1999-02-10 |
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