JPH0226625A - Back washing method of hollow fiber membrane filter - Google Patents
Back washing method of hollow fiber membrane filterInfo
- Publication number
- JPH0226625A JPH0226625A JP17382688A JP17382688A JPH0226625A JP H0226625 A JPH0226625 A JP H0226625A JP 17382688 A JP17382688 A JP 17382688A JP 17382688 A JP17382688 A JP 17382688A JP H0226625 A JPH0226625 A JP H0226625A
- Authority
- JP
- Japan
- Prior art keywords
- hollow fiber
- fiber membrane
- liquid
- liquid level
- back washing
- 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
- 239000012528 membrane Substances 0.000 title claims abstract description 75
- 239000012510 hollow fiber Substances 0.000 title claims abstract description 73
- 238000011001 backwashing Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims description 10
- 239000007788 liquid Substances 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 230000001681 protective effect Effects 0.000 description 11
- 230000005587 bubbling Effects 0.000 description 9
- 230000007423 decrease Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000012535 impurity Substances 0.000 description 7
- 239000010419 fine particle Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000001914 filtration Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 239000002901 radioactive waste Substances 0.000 description 2
- 241000255925 Diptera Species 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000000108 ultra-filtration 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中空糸膜
ろ過器の逆洗方法に関する。Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a method for backwashing 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0.3〜3m程度で微細な
孔を有する中空状の繊維の膜であり、単位行積当たりの
膜面積゛を大きくとることができる。(Prior Art) Generally, a hollow fiber membrane is a hollow fiber membrane having an outer diameter of about 0.3 to 3 m and having fine pores, and can have a large membrane area per unit line area.
また、外径が小さく、耐圧性に優れているので、精密ろ
適用、限外ろ適用、逆浸透用のろ過器材として電子工業
、医学、原子力等の分野で純水製造。In addition, because of its small outer diameter and excellent pressure resistance, it can be used as a filtration device for precision filtration, ultrafiltration, and reverse osmosis to produce pure water in fields such as the electronics industry, medicine, and nuclear power.
排水処理等に広く活用されている。It is widely used for wastewater treatment, etc.
ところで、このような中空糸膜ろ過器において、効率的
な逆洗方法を見出だすことは、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53−108882号
公報で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て付着微粒子を除去する方法
が開示されている。また特開昭60−.19002号公
報では圧力空気による逆洗で付着微粒子を剥離するとと
もに中空糸膜を撮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方法が
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 developed. being done. For example, Japanese Patent Application Laid-Open No. 53-108882 discloses a method in which adhered fine particles are peeled off by backwashing with pressurized air and at the same time, the adhered fine particles are removed by vibrating a hollow fiber membrane. Also, JP-A-60-. Publication No. 19002 discloses a method in which adhered fine particles are peeled off by backwashing with pressurized air, and air for moving the hollow fiber membrane is generated from the side or below of the hollow fiber membrane to remove the adhered fine particles. .
(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号公報では胴部の液位の挙動につい
ては記述されていない。これらの方法により逆洗を実施
すると逆洗中に胴部の液位が次第に減少するという現象
が生じる。これにより、中空糸膜モジュールの上部が空
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
が保護筒内で滞留し液上部近傍で中空糸膜に再び付着す
るという現象を起こす。ざらに、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があり、中空糸
膜の劣化の一因となり、もって逆洗効率が低下すること
につながる。(Problems to be Solved by the Invention) However, Japanese Patent Laid-Open Nos. 53-108882 and 60-19002 do not describe the behavior of the liquid level in the body. When backwashing is performed using these methods, a phenomenon occurs in which the liquid level in the body 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 causes the detached adhering particles to remain in the protective cylinder, causing the hollow fiber near the upper part of the liquid to evaporate. This causes the phenomenon of re-adhering to the thread membrane. In addition, depending on the type of hollow fiber membrane, the hollow fiber membrane may be exposed to the air, which may cause deterioration of the hollow fiber membrane, leading to a reduction in backwashing efficiency.
本発明はこの様な点に対処してなされたもので、逆洗効
率を向上させた中空糸膜ろ過器の逆洗方法を提供するこ
とを目的とする。The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a method for backwashing a hollow fiber membrane filter with improved backwashing efficiency.
[発明の構成]
(課題を解決するための手段)
本発明は、多孔質中空糸膜モジュールを保持する管板と
該管板より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筒と少なくとも液木口、
ベント、逆洗水出口のノズルを有し該中空糸膜の外側を
被う胴部と少なくとも液出口のノズルを有し該中空糸膜
の内側に通じる蓋部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方法において、前記胴部の液位
が逆洗中に一定以下に減少しないように逆洗中の液位を
検出し、この液位信号の指示によって液を補給するか、
または予め設定したタイマによって定期的゛に前記胴部
内に液を補給することを特徴とする。[Structure of the Invention] (Means for Solving the Problems) The present invention provides a tube plate that holds a porous hollow fiber membrane module, and a tube plate that protects each hollow fiber membrane module from the tube plate. With a protective tube and at least a liquid end,
It consists of a body part having a vent and a backwash water outlet nozzle and covering the outside of the hollow fiber membrane, and a lid part having at least a liquid outlet nozzle and communicating with the inside of the hollow fiber membrane, using air as a backwashing means. In a method for backwashing a hollow fiber membrane filter, the liquid level during backwashing is detected so that the liquid level in the body does not decrease below a certain level during backwashing, and the liquid is replenished according to instructions from this liquid level signal. mosquito,
Alternatively, the liquid is periodically replenished into the body by a preset timer.
(作 用)
中空糸膜ろ過器で逆洗操作を行っていると、徐々に胴部
内の液位が低下してくる。そこで、液位低下信号かまた
は予め設定したタイマを作動させて保護筒内に空気ポン
プ状態が維持できる一定の液位になるよう液を補給する
。この一定の液位を保つことによって逆洗効率が向上す
る。(Function) When backwashing is performed using a hollow fiber membrane filter, the liquid level in the body gradually decreases. Therefore, a liquid level drop signal or a preset timer is activated to replenish the liquid to a constant liquid level in the protection cylinder to maintain the air pump state. By maintaining this constant liquid level, backwashing efficiency is improved.
(実施例) 本発明の一実施例を第1図を用いて説明する。(Example) An embodiment of the present invention will be described with reference to FIG.
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、上部の基幹が樹脂で固定さ
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に液密に垂設されており、各中空糸膜モジュール1を
覆うように保護筒4が管板3に取付けられている。この
保護筒4の上部にはベント穴16が設けられている。そ
して、中空糸膜ろ過器は液入口ノズル8とベントノズル
9と逆洗水出口ノズル11とバブリング空気ノズル12
を有する胴部6と液出口ノズル10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。さらに、胴部6には胴部内の液位りにより作
動する液位スイッチ7が設けられているから、なお、符
号11はバブリング空気ノズル12に設けられた空気吹
出口である。In the figure, 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 backbone is fixed with resin. The hollow fiber membrane modules 1 are vertically installed in a liquid-tight manner from tube sheet 3 to tube sheet 3, and a protective cylinder 4 is attached to tube sheet 3 so as to cover each hollow fiber membrane module 1. A vent hole 16 is provided in the upper part of the protective tube 4. The hollow fiber membrane filter has a liquid inlet nozzle 8, a vent nozzle 9, a backwash water outlet nozzle 11, and a bubbling air nozzle 12.
The tube plate 3 and the hollow fiber membrane module 1 are covered by a body part 6 having a diameter and a lid part 5 having a liquid outlet nozzle 10. Further, since the body 6 is provided with a liquid level switch 7 that is activated by the liquid level within the body, reference numeral 11 is an air outlet provided in the bubbling air nozzle 12.
中空糸膜2の逆洗操作にあたり、まず液出口ノズル10
から逆洗水を中空糸膜モジュール1の上部から中空糸膜
2内を通過させて胴部6内に流入して水張りをし胴部6
内に一定の水位を保つ。When backwashing the hollow fiber membrane 2, first the liquid outlet nozzle 10
Backwash water is passed through the hollow fiber membrane 2 from the upper part of the hollow fiber membrane module 1 and flows into the body 6 to fill the body 6 with water.
Maintain a constant water level within the tank.
つぎにバブリング空気ノズル12を通して空気吹出口1
7から胴部6内に空気を吹き出すと空気の作用によって
中空糸膜2に振動が与えられ、中空糸膜2の表面に付着
した不純物が剥離し、逆洗される。逆洗が終ったら逆洗
水出口ノズルから胴部6内の不純物が混った逆洗水を排
出する。逆洗に際しては逆洗水を流しながらバブリング
操作を行う場合もある。Next, the air outlet 1 is passed through the bubbling air nozzle 12.
When air is blown into the body 6 from 7, the hollow fiber membrane 2 is vibrated by the action of the air, and impurities adhering to the surface of the hollow fiber membrane 2 are peeled off and backwashed. When the backwashing is finished, the backwash water mixed with impurities in the body 6 is discharged from the backwash water outlet nozzle. During backwashing, a bubbling operation may be performed while flowing backwash water.
この様な中空糸膜ろ過器で逆洗操作を実施すると初期に
は第2図に示すように保護筒4内はバブリング空気の気
泡14の作用によりいわゆる空気ポンプ状態となり、保
護筒4内の水15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内の水が循環状態となる。これによ
り、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膜2の付は根部
分が洗浄されると共に保護筒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。When a backwash operation is carried out with such a hollow fiber membrane filter, initially the inside of the protection tube 4 becomes in a so-called air pump state due to the action of bubbling air bubbles 14, as shown in FIG. 15 is vigorously jetted out from the vent hole 16 of the protection tube 4, and the water inside the protection tube 4 is in a circulating state. As a result, the lower end of the upper part of the hollow fiber membrane module 1 where the hollow fiber membrane 2 is fixed with the resin, that is, the root part of the hollow fiber membrane 2, is cleaned and the hollow fiber membrane 2 is removed from the hollow fiber membrane 2 into the protection tube 4. The peeled adhering impurities will not stay and re-adhere to the hollow fiber membrane 2.
しかしながら、時間が経つとともに胴部6内の液位りが
徐々に下がり保護筒4のベント穴16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図に示し
たように液位りが低下する。However, as time passes, the liquid level inside the body 6 gradually decreases, and the water that was spouting out vigorously from the vent hole 16 of the protective tube 4 gradually loses its force, and the liquid level decreases as shown in Figure 3. decreases.
この状態になると空気ポンプ作用が発揮されなくなり、
中空糸膜2の付は根部分が洗浄されなくなると共に保護
筒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。In this state, the air pump action will no longer be exerted,
At the base of the hollow fiber membrane 2, the root portion 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部6内の液位りの低下による
空気ポンプ状態喪失以降は、逆洗効果がなくなる。そし
て逆洗時間が有効に生かされないばかりでなく、前述の
ように逆洗効果としてはむしろ逆効果となるものと考え
られる。This means that even if the air bubbling time (backwash time) is, for example, 30 minutes, the backwash effect disappears after the air pump state is lost due to a drop in the liquid level in the body 6. Not only is the backwashing time not effectively utilized, but the backwashing effect may even be counterproductive as described above.
この液位低下の状態を液位スイッチ7により検出し保護
筒4内が空気ポンプ状態に復帰するまで原液または補給
水を給水する。This state of drop in the liquid level is detected by the liquid level switch 7, and undiluted solution or make-up water is supplied until the inside of the protective cylinder 4 returns to the air pump state.
この給水操作により、空気ポンプ状態が常に維持された
逆洗時間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
線廃液ヤ復水の処理に用いるような場合には特に有用で
定期検査時の作業員の被曝低減にもつながる。This water supply operation makes effective use of the backwashing time during which the air pump condition is constantly maintained, improving backwashing efficiency. Improving backwashing efficiency not only contributes to extending the lifespan of hollow fiber membrane modules, but it is also particularly useful when used, for example, in the treatment of radioactive waste liquid and condensate at nuclear power plants, and reduces the burden on workers during periodic inspections. 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に示し、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、上部基幹が樹脂で固定され
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、各中空モジュール1を覆うよ
うに保護筒4が管板3に取り付けられている。この保護
筒4の上部にはベント穴16が設けられている。そして
、中空糸膜ろ過器は液入口ノズル8とベントノズル9と
逆洗水出口ノズル11とバブリング空気入口ノズル12
を有する胴部6と液出口ノズル10と補給水入口ノズル
13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。In the figure, reference numeral 1 denotes 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 backbone is fixed with resin. This hollow fiber membrane module 1 is constructed from a tube sheet 3 to a tube sheet 3.
A protective cylinder 4 is attached to the tube plate 3 so as to cover each hollow module 1. A vent hole 16 is provided in the upper part of the protective tube 4. The hollow fiber membrane filter has a liquid inlet nozzle 8, a vent nozzle 9, a backwash water outlet nozzle 11, and a bubbling air inlet nozzle 12.
The tube plate 3 and the hollow fiber membrane module 1 are covered by a body part 6 having a liquid outlet nozzle 10 and a cover part 5 having a make-up water inlet nozzle 13.
この様な中空糸膜ろ過器で逆洗操作を実施すると初期に
は第2図に示すように保護筒4内でバブリング空気の気
泡14の作用によりいわゆる空気ポンプ状態となり、保
護筒4内の水15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
より、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
洗浄されると共に保護筒内に中空糸膜2より剥離した付
着不純物が滞留し中空糸膜2に再付着することはない。When a backwashing operation is carried out with such a hollow fiber membrane filter, initially, as shown in FIG. 15 is vigorously jetted out from the vent hole 16 of the protection tube 4, and the water inside the 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 that have peeled off from the hollow fiber membrane 2 are removed into the protective cylinder. will not remain and re-adhere to the hollow fiber membrane 2.
しかしながら、時間が経つとともに胴部内の液位が徐
々に下がり保護筒4のベント穴16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の付は根部分が洗浄されなくなると共に保護筒内に中
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 body gradually decreases, and the water that was spouting out from the vent hole 16 of the protection tube 4 gradually loses its force, resulting in a state as shown in FIG. 3. When this happens, the air pump state is no longer maintained, and the root portion of the hollow fiber membrane 2 is no longer cleaned, and adhering impurities separated from the hollow fiber membrane 2 remain in the protective cylinder 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部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。This means that even if the air bubbling time (backwashing time) is, for example, 30 minutes, once the air pump status is lost due to a drop in the liquid level in the body, the backwashing effect disappears, and that time is not effectively utilized. Rather, as mentioned above, it is thought that the backwashing effect is actually the opposite effect.
この状態の時間的特性をつかみタイマーまたはそれに代
わる制御的手段により補給水入口管13から逆洗時間中
定期的かつ自動的に空気ポンプ状態に復帰するまで補給
水を給水する。By grasping the temporal characteristics of this state, make-up water is periodically and automatically supplied from the make-up water inlet pipe 13 through the make-up water inlet pipe 13 using a timer or an alternative control means until the state returns to the air pump state.
これにより、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。As a result, the air pump condition is always maintained and the entire backwashing time is used effectively, improving backwashing efficiency.
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
や復水の処理に用いるような場合は特に有用で定期検査
時の作業員の被曝低減にもつながる。Improving backwashing efficiency not only contributes to extending the life of hollow fiber membrane modules, but it is also particularly useful when used, for example, in the treatment of radioactive waste liquid and condensate at nuclear power plants, and reduces the exposure of workers during periodic inspections. It also leads to reduction.
[発明の効果]
本発明によれば、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。[Effects of the Invention] According to the present invention, the efficiency of backwashing can be improved, and the life of the hollow fiber membrane can be extended by improving the efficiency of backwashing.
第1図は本発明の第1の実施例を示す中空糸膜ろ過器の
断面図、第2図および第3図は本発明の作用を示す中空
糸膜ろ過器の胴部内の要部を拡大して示す断面図、第4
図は本発明の第2の実施例を示す中空糸膜ろ過器の断面
図である。
1・・・中空糸膜モジュール
2・・・中空糸膜、 3・・・管板4・・・保護筒
、 5・・・蓋部6・・・胴部、 7
・・・液位スイッチ8・・・液入口ノズル、 9・・・
ベントノズル10・・・液出口ノズル、11・・・逆洗
水出口ノズル12・・・バブリング空気ノズル
13・・・補給水入口ノズル
14・・・気泡、15・・・水
16・・・ベント穴、17・・・空気吹出口箱
図
第
図
第1Fig. 1 is a sectional view of a hollow fiber membrane filter showing the first embodiment of the present invention, and Figs. 2 and 3 are enlarged views of the main parts inside the body of the hollow fiber membrane filter showing the action of the present invention. 4th cross-sectional view shown as
The figure is a sectional view of a hollow fiber membrane filter showing a second embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Hollow fiber membrane module 2...Hollow fiber membrane, 3...Tube plate 4...Protection cylinder, 5...Lid part 6...Body part, 7
...Liquid level switch 8...Liquid inlet nozzle, 9...
Vent nozzle 10...liquid outlet nozzle, 11...backwash water outlet nozzle 12...bubbling air nozzle 13...makeup water inlet nozzle 14...air bubble, 15...water 16...vent Hole, 17... Air outlet box diagram Figure 1
Claims (1)
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筒と少なくとも液入口、ベント、逆
洗水出口のノズルを有し該中空糸膜の外側を被う胴部と
少なくとも液出口のノズルを有し該中空糸膜の内側に通
じる蓋部からなり逆洗手段として空気を用いる中空糸膜
ろ過器の逆洗方法において、前記胴部の液位が一定以下
に下がらないように逆洗中の液位を検出し、この液位信
号の支持により液を補給するか、または予め設定したタ
イマーによって定期的に前記胴部内に液を補給すること
を特徴とする中空糸膜ろ過器の逆洗方法。A tube plate for holding a porous hollow fiber membrane module, a protection cylinder for protecting each hollow fiber membrane module from the tube plate, and nozzles for at least a liquid inlet, a vent, and a backwash water outlet. A backwashing of a hollow fiber membrane filter using air as a backwashing means, comprising a body part covering the outside of the hollow fiber membrane, and a lid part having at least a liquid outlet nozzle and communicating with the inside of the hollow fiber membrane. In the method, the liquid level during backwashing is detected so that the liquid level in the body does not fall below a certain level, and the liquid is replenished based on this liquid level signal, or the liquid is periodically replenished by a preset timer. A method for backwashing a hollow fiber membrane filter characterized by replenishing liquid into the body.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17382688A JPH0226625A (en) | 1988-07-14 | 1988-07-14 | Back washing method of hollow fiber membrane filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17382688A JPH0226625A (en) | 1988-07-14 | 1988-07-14 | Back washing method of hollow fiber membrane filter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0226625A true JPH0226625A (en) | 1990-01-29 |
Family
ID=15967873
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17382688A Pending JPH0226625A (en) | 1988-07-14 | 1988-07-14 | Back washing method of hollow fiber membrane filter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0226625A (en) |
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