JPH0671540B2 - Cleaning method of hollow fiber membrane filter - Google Patents
Cleaning method of hollow fiber membrane filterInfo
- Publication number
- JPH0671540B2 JPH0671540B2 JP63319589A JP31958988A JPH0671540B2 JP H0671540 B2 JPH0671540 B2 JP H0671540B2 JP 63319589 A JP63319589 A JP 63319589A JP 31958988 A JP31958988 A JP 31958988A JP H0671540 B2 JPH0671540 B2 JP H0671540B2
- Authority
- JP
- Japan
- Prior art keywords
- fiber membrane
- hollow fiber
- membrane filter
- valve
- liquid chamber
- 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.)
- Expired - Lifetime
Links
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- Separation Using Semi-Permeable Membranes (AREA)
Description
【発明の詳細な説明】 ［発明の目的］ （産業上の利用分野） 本発明は中空糸膜フィルタの洗浄方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a method for cleaning a hollow fiber membrane filter.
（従来の技術） 中空糸膜フィルタは、一般に単位容積当りの膜面積が大
きくとれるため、装置のコンパクト化が図れ、しかも除
去性能が優れていることから各種の濾過装置に広く用い
られている。しかし、中空糸膜フィルタは被処理水中に
含まれるクラッド等の除去対象物が中空糸膜の外表面に
付着するため、濾過処理時間の経過に伴い除去対象物の
付着量が増加し、次第に濾過効率が低下する。そこで、
このような問題に対処するために、中空糸膜フィルタを
形成する中空糸膜の内側に加圧気体を導入して濾過液又
は洗浄水を中空糸膜の内側から外側へ噴出させるととも
に、前記中空糸膜フィルタの下方より多数の気泡を上方
へ向けて噴出させて中空糸膜の外表面に付着した付着物
を逆洗洗浄する方法が特開昭60−19002号において提案
されている。(Prior Art) Hollow fiber membrane filters are widely used in various filtration devices because they generally have a large membrane area per unit volume and can be made compact and have excellent removal performance. However, in the hollow fiber membrane filter, the object to be removed such as the clad contained in the water to be treated adheres to the outer surface of the hollow fiber membrane. Efficiency is reduced. Therefore,
In order to deal with such a problem, a pressurized gas is introduced into the hollow fiber membrane forming the hollow fiber membrane filter to eject the filtrate or washing water from the inside to the outside of the hollow fiber membrane, Japanese Patent Laid-Open No. 60-19002 proposes a method in which a large number of bubbles are jetted upward from below the fiber membrane filter to backwash and wash deposits adhering to the outer surface of the hollow fiber membrane.
第２図は中空糸膜フィルタを用いた濾過装置の構成を示
すもので、中空糸膜フィルタ１を収容する容器本体２
は、処理液室2aと濾過液室2bの２室から構成されてい
る。上記処理液室2aには処理液室2a内に処理液を導入す
る処理液供給管３が開閉弁４を介して接続されていると
ともに、処理液室2a内にてオーバーフローした処理液を
系外へ排出するオーバーフロー管５が開閉弁６を介して
接続されている。また、処理液室2aの下部には処理液室
2a内に加圧気体を供給する第１の加圧気体供給管７が開
閉弁８を介して接続されており、さらに処理液室2aの底
部には処理液室2a内に貯溜された凝縮廃液を排出する濃
縮廃液排出管９が開閉弁10を介して接続されている。FIG. 2 shows the structure of a filtering device using a hollow fiber membrane filter, which is a container body 2 for housing the hollow fiber membrane filter 1.
Is composed of two chambers, a treatment liquid chamber 2a and a filtrate liquid chamber 2b. A processing liquid supply pipe 3 for introducing the processing liquid into the processing liquid chamber 2a is connected to the processing liquid chamber 2a through an opening / closing valve 4, and the processing liquid overflowing in the processing liquid chamber 2a is removed from the system. An overflow pipe 5 for discharging to is connected via an on-off valve 6. Further, the processing liquid chamber is located below the processing liquid chamber 2a.
A first pressurized gas supply pipe 7 for supplying pressurized gas into 2a is connected via an on-off valve 8, and at the bottom of the processing liquid chamber 2a, condensed waste liquid stored in the processing liquid chamber 2a. A concentrated waste liquid discharge pipe 9 for discharging is connected via an opening / closing valve 10.
一方、前記濾過液室2bには中空糸膜フィルタ１で濾過さ
れた濾過液を系外へ排出する濾過液排出管11が開閉弁12
を介して接続されているとともに、濾過液室2b内に加圧
気体を供給する第２の気体供給管13が開閉弁14を介して
接続されている。On the other hand, a filtered liquid discharge pipe 11 for discharging the filtered liquid filtered by the hollow fiber membrane filter 1 to the outside of the system is provided in the filtered liquid chamber 2b with an on-off valve 12.
The second gas supply pipe 13 for supplying the pressurized gas into the filtrate chamber 2b is connected via the on-off valve 14.
上記のような構成において、処理液供給管３より供給さ
れる処理液を濾過処理する場合には、まず開閉弁４およ
び開閉弁12を開とし、処理液供給管３より処理液を処理
液室2a内に導入する。処理液室2a内に導入された処理液
は中空糸膜フィルタ１で濾過され、濾過液は濾過液室2b
から濾過液排出管11を介して系外へ排出される。一方、
処理液中の懸濁物は中空糸膜フィルタ１の外側で捕捉さ
れ、中空糸膜フィルタ１を形成する中空糸膜の外表面に
付着する。ここで、中空糸膜の外表面に処理液中の懸濁
物が付着すると、処理液室2aと濾過液室2bとの圧力差で
ある濾過差圧が上昇する。したがって、濾過差圧が中空
糸膜フィルタ１の種類、濾過処理装置の設計容量などに
よって定まる使用限界差圧に達した時点で開閉弁４およ
び開閉弁12を閉とし、濾過処理運転を中止して後述する
逆洗洗浄を行う。In the above configuration, when the treatment liquid supplied from the treatment liquid supply pipe 3 is filtered, first the on-off valve 4 and the on-off valve 12 are opened and the treatment liquid is supplied from the treatment liquid supply pipe 3 to the treatment liquid chamber. Install in 2a. The treatment liquid introduced into the treatment liquid chamber 2a is filtered by the hollow fiber membrane filter 1, and the filtrate is the filtrate liquid chamber 2b.
Is discharged to the outside of the system via the filtrate discharge pipe 11. on the other hand,
The suspension in the treatment liquid is captured outside the hollow fiber membrane filter 1 and adheres to the outer surface of the hollow fiber membrane forming the hollow fiber membrane filter 1. Here, when the suspension in the treatment liquid adheres to the outer surface of the hollow fiber membrane, the filtration pressure difference, which is the pressure difference between the treatment liquid chamber 2a and the filtrate liquid chamber 2b, increases. Therefore, when the filtration differential pressure reaches the operating limit differential pressure determined by the type of the hollow fiber membrane filter 1, the design capacity of the filtration treatment device, etc., the on-off valve 4 and the on-off valve 12 are closed, and the filtration treatment operation is stopped. The backwash cleaning described later is performed.
すなわち、まず開閉弁14を開いて加圧気体を濾過液室2b
内に導入し、濾過液室2b内の濾過液と中空糸膜フィルタ
１中の少量の濾過液を加圧気体によって濾過方向と逆方
向に押し出す。これと同時に、開閉弁８を開いて気体供
給管７より加圧気体を処理液室2aに導入し、中空糸膜フ
ィルタ１の下方より多数の気泡を上方へ向けて噴出さ
せ、中空糸膜フィルタ１を激しく振動させる。そして、
この操作を所定時間続けた後、開閉弁8,14を閉として気
体の供給を停止させ、次いで中空糸膜フィルタ１より剥
離除去された微粒子を含む濃縮廃液を開閉弁10を開いて
濃縮廃液管９より排出する。That is, first, the opening / closing valve 14 is opened to pressurize the pressurized gas into the filtrate chamber 2b.
It is introduced into the inside, and the filtrate in the filtrate chamber 2b and a small amount of the filtrate in the hollow fiber membrane filter 1 are pushed out by the pressurized gas in the direction opposite to the filtration direction. At the same time, the open / close valve 8 is opened to introduce a pressurized gas into the treatment liquid chamber 2a from the gas supply pipe 7, and a large number of bubbles are jetted upward from below the hollow fiber membrane filter 1 to produce a hollow fiber membrane filter. Vibrate 1 violently. And
After this operation is continued for a predetermined time, the on-off valves 8 and 14 are closed to stop the gas supply, and then the concentrated waste liquid containing fine particles peeled and removed from the hollow fiber membrane filter 1 is opened by opening the on-off valve 10 and the concentrated waste liquid pipe. Eject from 9.
ところで、前述した従来の洗浄方法は中空糸膜フィルタ
１に振動を与えながら中空糸膜フィルタ１に付着した濾
過物を逆洗により除去する方法であることから、逆洗の
みの方法に比べて濾過物を効果的に除去することができ
る。しかしながら、前述した従来方法では中空糸膜フィ
ルタ１の下部に付着した濾過物は比較的容易に除去され
るが、中空糸膜フィルタ１の上部では中空糸膜フィルタ
１への加振効果が弱いため、濾過物が残存し易い。この
ため、このような状態で濾過処理運転に移行すると、濾
過処理運転を再開してから比較的早期の段階で中空糸膜
フィルタが目詰りを起し易いという問題があった。By the way, since the above-mentioned conventional cleaning method is a method of removing the filtered matter adhering to the hollow fiber membrane filter 1 by backwashing while vibrating the hollow fiber membrane filter 1, filtration is performed as compared with the method of only backwashing. Objects can be effectively removed. However, in the above-mentioned conventional method, although the filtered matter attached to the lower part of the hollow fiber membrane filter 1 is relatively easily removed, the vibrating effect on the hollow fiber membrane filter 1 is weak in the upper part of the hollow fiber membrane filter 1. , The filtered material is likely to remain. Therefore, if the filtration processing operation is performed in such a state, there is a problem that the hollow fiber membrane filter is likely to be clogged at a relatively early stage after restarting the filtration processing operation.
なお、前述した洗浄方法以外にも処理液室2aに薬品（例
えば過酸化水素）を注入して中空糸膜フィルタ１を洗浄
する方法もあるが、使用回数が増えると樹脂等の繊維で
構成された中空糸膜が劣化し、フィルタ機能を維持でき
なくなるという問題を有していた。In addition to the cleaning method described above, there is also a method of injecting a chemical (for example, hydrogen peroxide) into the treatment liquid chamber 2a to clean the hollow fiber membrane filter 1, but when the number of times of use increases, the hollow fiber membrane filter 1 is composed of fibers such as resin. Also, there is a problem that the hollow fiber membrane deteriorates and the filter function cannot be maintained.
（発明が解決しようとする課題） 上述した如く、従来においては中空糸膜フィルタ１から
濾過物が完全に除去されない状態で濾過処理運転に移行
すると、濾過処理運転を再開してから比較的早期の段階
で中空糸膜フィルタ１が目詰りを起こし、使用限界差圧
に達するため、濾過処理運転の運転時間が短いという問
題があった。(Problems to be Solved by the Invention) As described above, in the conventional case, when the filtration treatment operation is performed in a state where the filtration product is not completely removed from the hollow fiber membrane filter 1, it is relatively early after the filtration treatment operation is restarted. At the stage, the hollow fiber membrane filter 1 is clogged and reaches the use limit differential pressure, which causes a problem that the operation time of the filtration treatment operation is short.
本発明は上記のような問題点に鑑みてなされたものであ
り、その目的は中空糸膜フィルタに付着した濾過物をよ
り効果的に除去することのできる中空糸膜フィルタの洗
浄方法を提供しようとするものである。The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for cleaning a hollow fiber membrane filter, which can more effectively remove a filtrate attached to the hollow fiber membrane filter. It is what
［発明の構成］ （課題を解決するための手段） 上記目的を達成するために本発明は、中空糸膜フィルタ
の外表面に付着した濾過物を逆洗により除去する際に、
前記中空糸膜フィルタが収容された容器内に多数の気泡
を発生させて前記中空糸膜フィルタを振動させるととも
に、前記容器内の液位を下降させることを特徴とするも
のである。[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a method of backwashing to remove the filtration material attached to the outer surface of a hollow fiber membrane filter,
A large number of bubbles are generated in the container in which the hollow fiber membrane filter is housed to vibrate the hollow fiber membrane filter and the liquid level in the container is lowered.
（作用） 本発明では、中空糸膜フィルタの外表面に付着した濾過
物を逆洗により除去する際に中空糸膜フィルタが収容さ
れた容器内の液位を下降させると、中空糸膜フィルタの
表面全体が気泡の消失効果により一様に洗浄されるの
で、中空糸膜フィルタに付着した濾過物をより効果的に
除去することができる。(Operation) In the present invention, when the liquid level in the container in which the hollow fiber membrane filter is housed is lowered when the filtered matter attached to the outer surface of the hollow fiber membrane filter is removed by backwashing, Since the entire surface is uniformly washed by the effect of eliminating bubbles, it is possible to more effectively remove the filtered material attached to the hollow fiber membrane filter.
（実施例） 第１図は本発明方法を説明するための中空糸膜フィルタ
を用いた濾過装置の構成を示すもので、第２図と同一部
分には同一符号を付し、その部分の説明は省略する。第
１図において、濾過液室2b内に加圧気体を供給する気体
供給配管13にはベント管15が開閉弁16を介して接続され
ており、上記開閉弁16および気体供給配管13の開閉弁14
は制御器17によって交互に開閉制御される構成となって
いる。(Example) FIG. 1 shows the structure of a filtration device using a hollow fiber membrane filter for explaining the method of the present invention. The same parts as those in FIG. Is omitted. In FIG. 1, a vent pipe 15 is connected to a gas supply pipe 13 for supplying a pressurized gas into the filtrate chamber 2b through an opening / closing valve 16, and the opening / closing valve 16 and the opening / closing valve of the gas supply pipe 13 are shown. 14
Is configured to be alternately opened and closed by the controller 17.
上記のような構成において、濾過処理運転中に中空糸膜
フィルタ１の濾過差圧が予め定められた設定値を越えた
場合には、まず開閉弁４および開閉弁12を閉として濾過
処理運転を中止し、次のような逆洗洗浄を行う。まず開
閉弁14および開閉弁６を開とし、気体供給管13より加圧
気体を濾過液室2bに導入する。これと同時に、開閉弁８
を開いて加圧気体を処理液室2aに導入し、中空糸膜フィ
ルタ１の下方より多数の気泡を上方へ向けて噴出させ、
中空糸膜フィルタ１を振動させながら逆洗を行う。次
に、この逆洗を所定時間続けた後、制御器17により開閉
弁14および開閉弁16を交互に開閉させ、中空糸膜フィル
タ１に圧力脈動を与える。また、このとき開閉弁10を開
いて処理液室2aに貯溜された処理液の液面を徐々に下降
させる。そして、この操作を複数回繰り返す。In the above configuration, when the filtration differential pressure of the hollow fiber membrane filter 1 exceeds a predetermined set value during the filtration treatment operation, first the on-off valve 4 and the on-off valve 12 are closed to start the filtration treatment operation. Stop and perform backwashing as follows. First, the on-off valve 14 and the on-off valve 6 are opened, and pressurized gas is introduced into the filtrate chamber 2b through the gas supply pipe 13. At the same time, the on-off valve 8
Is opened to introduce pressurized gas into the treatment liquid chamber 2a, and a large number of bubbles are ejected upward from below the hollow fiber membrane filter 1,
Backwashing is performed while vibrating the hollow fiber membrane filter 1. Next, after this backwashing is continued for a predetermined time, the controller 17 alternately opens and closes the on-off valve 14 and the on-off valve 16 to give pressure pulsation to the hollow fiber membrane filter 1. At this time, the on-off valve 10 is opened to gradually lower the surface of the processing liquid stored in the processing liquid chamber 2a. Then, this operation is repeated a plurality of times.
このように本方法では、中空糸膜フィルタ１の外表面に
付着した付着物を逆洗により除去する際に、中空糸膜フ
ィルタ１が収容された容器本体２の処理液室2aに多数の
気泡を発生させて中空糸膜フィルタ１に振動を与えると
ともに、処理液室2aの液位を降下させると、気泡の消失
効果により中空糸膜フィルタ１の表面全体が一様に洗浄
される。したがって、中空糸膜フィルタ１の外表面に付
着した付着物をより効果的に除去することができ、逆洗
後の初期差圧の上昇率を低い値に抑えることができる。
また、このとき制御器17により開閉弁14および開閉弁16
を交互に開閉させ、中空糸膜フィルタ１に圧力脈動を与
えることにより、より効果的に中空糸膜フィルタ全体を
一様に洗浄することができ、しかも処理液室2aの液面下
降及び上昇を複数回繰り返すことにより、さらに効果的
に中空糸膜フィルタ全体を一様に洗浄することができ
る。As described above, according to the present method, when removing the deposits adhering to the outer surface of the hollow fiber membrane filter 1 by backwashing, a large number of bubbles are present in the treatment liquid chamber 2a of the container body 2 in which the hollow fiber membrane filter 1 is housed. When the hollow fiber membrane filter 1 is vibrated and the liquid level in the treatment liquid chamber 2a is lowered, the entire surface of the hollow fiber membrane filter 1 is uniformly washed by the effect of eliminating bubbles. Therefore, it is possible to more effectively remove the deposits attached to the outer surface of the hollow fiber membrane filter 1, and it is possible to suppress the increase rate of the initial differential pressure after backwashing to a low value.
At this time, the controller 17 causes the on-off valve 14 and the on-off valve 16 to
By alternately opening and closing, the pressure pulsation is applied to the hollow fiber membrane filter 1, the entire hollow fiber membrane filter can be washed more effectively and uniformly, and the liquid level of the treatment liquid chamber 2a can be lowered and raised. By repeating a plurality of times, the entire hollow fiber membrane filter can be washed more effectively and uniformly.
なお、本発明は上記実施例に限定されるものではない。
例えば、上記実施例では中空糸膜フィルタ全体をより効
果的に洗浄するために、中空糸膜フィルタ１に加圧気体
の圧力脈動を与えながら処理液室2aの液面を下降させた
が、必ずしも中空糸膜フィルタ１に加圧気体の圧力脈動
を与える必要はなく、中空糸膜フィルタ１の濾過差圧に
応じて適宜行えばよい。The present invention is not limited to the above embodiment.
For example, in the above embodiment, in order to more effectively clean the entire hollow fiber membrane filter, the liquid level of the treatment liquid chamber 2a was lowered while applying pressure pulsation of the pressurized gas to the hollow fiber membrane filter 1, but it is not always necessary. It is not necessary to apply pressure pulsation of the pressurized gas to the hollow fiber membrane filter 1, and it may be appropriately performed according to the filtration differential pressure of the hollow fiber membrane filter 1.
［発明の効果］ 以上説明したように本発明によれば、中空糸膜フィルタ
の外表面に付着した付着物をより効果的に除去すること
ができる。[Advantages of the Invention] As described above, according to the present invention, it is possible to more effectively remove the deposits attached to the outer surface of the hollow fiber membrane filter.
第１図は本発明方法を説明するための中空糸膜フィルタ
を用いた濾過装置の構成図、第２図は従来の洗浄方法を
説明するための濾過装置の構成図である。 １……中空糸膜フィルタ、２……容器本体、2a……処理
液室、2b……濾過液室、３……濾過液供給管、５……オ
ーバーフロー管、７……気体供給管、９……凝縮廃液供
給管、11……濾過液排出管、13……気体供給管、15……
ベント管、17……制御器。FIG. 1 is a block diagram of a filtering device using a hollow fiber membrane filter for explaining the method of the present invention, and FIG. 2 is a block diagram of a filtering device for explaining a conventional cleaning method. 1 ... Hollow fiber membrane filter, 2 ... Container body, 2a ... Treatment liquid chamber, 2b ... Filtration liquid chamber, 3 ... Filtration liquid supply pipe, 5 ... Overflow pipe, 7 ... Gas supply pipe, 9 ...... Condensed waste liquid supply pipe, 11 …… filtrate discharge pipe, 13 …… gas supply pipe, 15 ……
Vent pipe, 17 ... Controller.
Claims (3)
物を逆洗により除去する際に、前記中空糸膜フィルタが
収容された容器内に多数の気泡を発生させて前記中空糸
膜フィルタを振動させるとともに、前記容器内の液位を
下降させることを特徴とする中空糸膜フィルタの洗浄方
法。1. A hollow fiber membrane filter, wherein a large number of air bubbles are generated in a container in which the hollow fiber membrane filter is housed when the filtered material attached to the outer surface of the hollow fiber membrane filter is removed by backwashing. And a liquid level in the container is lowered, while cleaning the hollow fiber membrane filter.
物を逆洗により除去する際に、前記中空糸膜フィルタに
圧力脈動を与えることを特徴とする請求項１記載の中空
糸膜フィルタの洗浄方法。2. The hollow fiber membrane filter according to claim 1, wherein pressure pulsation is given to the hollow fiber membrane filter when the filtered material attached to the outer surface of the hollow fiber membrane filter is removed by backwashing. Cleaning method.
させることを特徴とする請求項１記載の中空糸膜フィル
タの洗浄方法。3. The method for cleaning a hollow fiber membrane filter according to claim 1, wherein the liquid level in the container is repeatedly lowered a plurality of times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63319589A JPH0671540B2 (en) | 1988-12-20 | 1988-12-20 | Cleaning method of hollow fiber membrane filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63319589A JPH0671540B2 (en) | 1988-12-20 | 1988-12-20 | Cleaning method of hollow fiber membrane filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02164423A JPH02164423A (en) | 1990-06-25 |
| JPH0671540B2 true JPH0671540B2 (en) | 1994-09-14 |
Family
ID=18111956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63319589A Expired - Lifetime JPH0671540B2 (en) | 1988-12-20 | 1988-12-20 | Cleaning method of hollow fiber membrane filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0671540B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5238947B2 (en) * | 1974-06-21 | 1977-10-01 | ||
| JPS61157306A (en) * | 1984-12-28 | 1986-07-17 | Ebara Corp | Method for washing hollow yarn membrane |
-
1988
- 1988-12-20 JP JP63319589A patent/JPH0671540B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008041320A1 (en) | 2006-10-03 | 2008-04-10 | Asahi Kasei Chemicals Corporation | Method of operating membrane separator |
| CN103723795A (en) * | 2013-12-04 | 2014-04-16 | 江苏双净净化科技有限公司 | Concentrating and recovering device for copolymerization resin waste water and recovery method thereof |
| CN103723795B (en) * | 2013-12-04 | 2015-05-20 | 江苏双净净化科技有限公司 | Concentrating and recovering device for copolymerization resin waste water and recovery method thereof |
| KR20180033818A (en) * | 2016-09-26 | 2018-04-04 | 롯데케미칼 주식회사 | Anaerobic membrane system and method for purifying water using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02164423A (en) | 1990-06-25 |
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