JP2003038939A - Method for washing membrane separation apparatus - Google Patents
Method for washing membrane separation apparatusInfo
- Publication number
- JP2003038939A JP2003038939A JP2002208079A JP2002208079A JP2003038939A JP 2003038939 A JP2003038939 A JP 2003038939A JP 2002208079 A JP2002208079 A JP 2002208079A JP 2002208079 A JP2002208079 A JP 2002208079A JP 2003038939 A JP2003038939 A JP 2003038939A
- Authority
- JP
- Japan
- Prior art keywords
- membrane
- tank
- membrane separation
- separation apparatus
- membrane module
- 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
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は膜分離装置の洗浄方
法に係り、特に、槽内に膜モジュールが懸垂された膜分
離装置において、膜分離処理により汚染した分離膜の膜
面付着物を効率的に除去する膜分離装置の洗浄方法に関
する。
【０００２】
【従来の技術】産業廃水や用水、或いは上下水につい
て、限外濾過膜等の分離膜により固液分離を行なって、
微粒子やコロイドを含有しない処理水を生産する膜分離
処理が広く利用されている。
【０００３】本発明者らは、このような処理に用いられ
る膜分離装置として、槽内に平膜モジュールを懸垂し、
この平膜モジュールの処理水取り出し側を吸引する手段
を設けた膜分離装置を発明し、先に特許出願した（特開
平１−２９３１０３号公報）。
【０００４】特開平１−２９３１０３号公報記載の膜分
離装置によれば、吸引手段により、処理水を吸引濾過す
ることにより効率的に膜分離を進行させることができ、
また、間欠的に吸引を行なって膜面に付与する負圧を増
減することにより、膜面付着物の蓄積を防止して高い透
過流束を維持することができる。
【０００５】
【発明が解決しようとする課題】しかしながら、上記特
開平１−２９３１０３号公報記載の膜分離装置であって
も、菌体濃度の高い原水の処理を継続すると、膜面に粘
質状の付着物が固着し、次第に透過流束が低下するとい
う問題があった。
【０００６】本発明は上記従来の問題点を解決し、槽内
に膜モジュールが懸垂された膜分離装置において、膜面
付着物を容易かつ効率的に除去することができる膜分離
装置の洗浄方法を提供することを目的とする。
【０００７】
【課題を解決するための手段】本発明の膜分離装置の洗
浄方法は、槽内に膜モジュールが懸垂されると共に、該
槽内の膜モジュールの下方に散気手段を設けた膜分離装
置において、散気を行ないながら該槽内の水の排出を行
なうことを特徴とする。
【０００８】本発明の膜分離装置の洗浄方法において、
膜分離処理により膜面に付着物が固着して透過流束が低
下した場合には、膜分離処理を停止して、散気手段より
散気すると共に、排出手段より槽内の保有水を排出す
る。槽内の保有水面は、排出手段による排水に従って、
徐々に、膜モジュールの上方から下方へ降下してゆく
が、この保有水面は、散気手段により散気された気泡の
崩壊で極めて大きく強い波の脈動面となっている。従っ
て、この脈動面が膜モジュールの表面を上方から下方へ
移動することにより、膜面の粘質状付着物質は効果的に
剥離除去され、剥離した付着物は排水手段により排水と
共に槽外へ円滑に排出される。
【０００９】
【発明の実施の形態】以下図面を参照して本発明の実施
例について詳細に説明する。
【００１０】図１は本発明の一実施例を示す膜分離装置
の系統図であって、図１（ａ）は膜処理時を示し、図１
（ｂ）は付着物の除去処理時を示す。
【００１１】図示の膜分離装置は、原水が貯留された槽
１内に膜モジュール２が懸垂されており、この膜モジュ
ール２の透過水は吸引ポンプＰを備える配管３より排出
される。また、槽１内の膜モジュール２下方には、散気
管４が設けられている。この散気管４は、膜モジュール
２の膜面のほぼ全面に散気された気泡が接触するよう
に、槽１内の膜モジュール２の下方位置に延出して設け
られている。５は槽１内の保有水の排出配管であり、バ
ルブＶを備える。
【００１２】本実施例の膜分離装置により、原水の膜分
離処理を行なう場合には、図１（ａ）に示す如く、吸引
ポンプＰで透過水を吸引して、効率的な膜濾過を行な
う。また、ポンプＰによる吸引を間欠的に行なって、適
宜膜面汚染を防止する。
【００１３】このような吸引濾過の継続により、膜モジ
ュール２の膜面に粘質状物質が付着して、透過流束が規
定値以下になった場合、或いは、予め設定した一定の運
転時間経過後において定期的に、次のような操作により
膜面付着物の除去を行なう。
【００１４】即ち、ポンプＰを停止し、バルブＶを開と
して槽１内の保有水を配管５より排出すると共に、散気
管４による散気を開始して槽１内に粗大気泡を混入させ
る。
【００１５】これにより、槽１内の保有水面Ｗには、図
１（ｂ）に示す如く、散気された気泡の崩壊で極めて大
きく強い波が発生し、この波立った保有水面Ｗの波が膜
モジュール２の膜面に衝突することにより、膜面の付着
物は効率的に剥離除去される。そして、排水に伴い、こ
の保有水面Ｗが膜モジュール２の上方から下方へ降下す
ることにより、膜モジュール２の膜面は全面的にその付
着物が除去される。
【００１６】このようにして膜面から剥離除去された付
着物は、排水と共に、配管５より槽１外へ排出される。
【００１７】排水終了後は、再度原水を槽１内に導入し
て膜分離処理を再開する。
【００１８】なお、図示の膜分離装置は本発明に係る膜
分離装置の一実施例であって、本発明はその要旨を超え
ない限り、何ら図示のものに限定されるものではない。
例えば、排出配管の排水操作はバルブによるものの他、
別途ポンプを設けて行なうこともできる。
【００１９】本発明において、膜モジュール１は平膜状
のものであっても、中空糸膜をすだれ状又は束状に結束
して設置したものであっても良いが、本発明は特に、強
力な逆圧洗浄が適さない平膜状膜モジュールを用いる場
合に有効である。
【００２０】
【発明の効果】以上詳述した通り、本発明の膜分離装置
の洗浄方法によれば、槽内を散気すると共に槽内の保有
水を排出することにより、膜面に強固に付着した粘質状
の付着物を容易かつ効率的に剥離除去して、槽外へ排出
することができる。このため、本発明によれば、膜モジ
ュールの透過流束を高く維持することが可能とされ、膜
分離処理効率は大幅に向上する。Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method for cleaning a membrane separation apparatus, and more particularly to a membrane separation apparatus in which a membrane module is suspended in a tank. The present invention relates to a method for cleaning a membrane separation device for efficiently removing deposits on the surface of a separated separation membrane. 2. Description of the Related Art Solid-liquid separation of industrial wastewater, service water, or sewage and sewage is performed by a separation membrane such as an ultrafiltration membrane.
Membrane separation processing for producing treated water containing no fine particles or colloids is widely used. The present inventors have suspended a flat membrane module in a tank as a membrane separation device used for such a treatment,
The inventor of the present invention has invented a membrane separation device provided with a means for sucking the treated water withdrawal side of the flat membrane module, and has previously filed a patent application (JP-A-1-293103). According to the membrane separation apparatus described in Japanese Patent Application Laid-Open No. 1-293103, the membrane separation can be efficiently advanced by suction-filtering the treated water by the suction means.
In addition, by increasing or decreasing the negative pressure applied to the membrane surface by performing intermittent suction, accumulation of deposits on the membrane surface can be prevented, and a high permeation flux can be maintained. [0005] However, even in the membrane separation device described in Japanese Patent Application Laid-Open No. 1-293103, if the treatment of raw water having a high concentration of bacterial cells is continued, the membrane surface becomes viscous. There is a problem in that the deposits adhere to and the permeation flux gradually decreases. SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and in a membrane separation apparatus in which a membrane module is suspended in a tank, a method of cleaning a membrane separation apparatus capable of easily and efficiently removing deposits on a membrane surface. The purpose is to provide. A method for cleaning a membrane separation apparatus according to the present invention is characterized in that a membrane module is suspended in a tank and a diffuser is provided below the membrane module in the tank. In the separation device, the water in the tank is discharged while performing aeration. In the method for cleaning a membrane separation device according to the present invention,
If the permeation flux is reduced due to the adhered matter on the membrane surface due to the membrane separation process, the membrane separation process is stopped, the air is diffused by the air diffuser, and the water held in the tank is discharged by the discharge device. I do. The water level in the tank will be adjusted according to the drainage
The water gradually descends from above to below the membrane module, and the retained water surface becomes an extremely large and strong pulsating surface due to the collapse of the bubbles diffused by the diffuser. Accordingly, the pulsating surface moves down from the surface of the membrane module from above to below, so that the viscous adhered substance on the membrane surface is effectively peeled and removed, and the peeled adhered substance is smoothly discharged to the outside of the tank together with the drainage by the drainage means. Is discharged. Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a system diagram of a membrane separation apparatus showing one embodiment of the present invention, and FIG.
(B) shows the time of the attachment removal process. In the illustrated membrane separation apparatus, a membrane module 2 is suspended in a tank 1 in which raw water is stored, and permeated water of the membrane module 2 is discharged from a pipe 3 having a suction pump P. A diffuser 4 is provided below the membrane module 2 in the tank 1. The diffuser tube 4 is provided to extend to a position below the membrane module 2 in the tank 1 so that the air bubbles diffused over almost the entire membrane surface of the membrane module 2. Reference numeral 5 denotes a discharge pipe for the water retained in the tank 1 and has a valve V. When performing the membrane separation treatment of raw water by the membrane separation apparatus of the present embodiment, as shown in FIG. 1A, the permeated water is sucked by a suction pump P to perform efficient membrane filtration. . Further, the suction by the pump P is performed intermittently to appropriately prevent the film surface contamination. When the suction filtration is continued and a viscous substance adheres to the membrane surface of the membrane module 2 and the permeation flux becomes lower than a specified value, or when a predetermined operating time elapses. Thereafter, the deposits on the film surface are periodically removed by the following operation. That is, the pump P is stopped, the valve V is opened, the water retained in the tank 1 is discharged from the pipe 5, and the air diffuser 4 is started to diffuse large bubbles into the tank 1. As a result, as shown in FIG. 1B, an extremely large and strong wave is generated due to the collapse of the diffused bubbles, and the wave on the retained water surface W in the tank 1 as shown in FIG. Collides with the film surface of the film module 2, whereby the deposits on the film surface are efficiently peeled and removed. Then, with the drainage, the retained water surface W falls downward from above the membrane module 2, so that the attached matter is completely removed from the membrane surface of the membrane module 2. The deposits thus separated and removed from the film surface are discharged out of the tank 1 through the pipe 5 together with the drainage. After the drainage, the raw water is introduced into the tank 1 again to restart the membrane separation process. The illustrated membrane separation apparatus is an embodiment of the membrane separation apparatus according to the present invention, and the present invention is not limited to the illustrated one as long as it does not exceed the gist.
For example, the drainage operation of the discharge pipe is performed by a valve,
A separate pump may be provided. In the present invention, the membrane module 1 may be a flat membrane type, or may be a hollow fiber membrane that is installed by being bound in an interdigitated or bundled shape. This is effective when using a flat membrane module which is not suitable for the reverse pressure cleaning. As described above in detail, according to the method for cleaning a membrane separation device of the present invention, the inside of the tank is diffused and the water retained in the tank is discharged, so that the membrane surface is firmly attached. The adhered viscous matter can be easily and efficiently peeled off and discharged out of the tank. For this reason, according to the present invention, the permeation flux of the membrane module can be maintained high, and the efficiency of the membrane separation treatment is greatly improved.
【図面の簡単な説明】
【図１】本発明の一実施例を示す膜分離装置の系統図で
あって、図１（ａ）は膜処理時を示し、図１（ｂ）は付
着物の除去処理時を示す。
【符号の説明】
１ 槽
２ 膜モジュール
４ 散気管
５ 排出配管BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram of a membrane separation apparatus showing one embodiment of the present invention, wherein FIG. 1 (a) shows a state during membrane treatment, and FIG. Shows the time of the removal processing. [Description of Signs] 1 tank 2 membrane module 4 diffuser pipe 5 discharge pipe
─────────────────────────────────────────────────────
【手続補正書】
【提出日】平成１４年７月１７日（２００２．７．１
７）
【手続補正１】
【補正対象書類名】明細書
【補正対象項目名】請求項１
【補正方法】変更
【補正内容】
【請求項１】 槽内に膜モジュールが懸垂されると共
に、該槽内の膜モジュールの下方に散気手段を設けた膜
分離装置において、散気により波を発生させながら該槽
内の水の排出を行なうことを特徴とする膜分離装置の洗
浄方法。
【手続補正２】
【補正対象書類名】明細書
【補正対象項目名】０００７
【補正方法】変更
【補正内容】
【０００７】
【課題を解決するための手段】本発明の膜分離装置の洗
浄方法は、槽内に膜モジュールが懸垂されると共に、該
槽内の膜モジュールの下方に散気手段を設けた膜分離装
置において、散気により波を発生させながら該槽内の水
の排出を行なうことを特徴とする。
【手続補正３】
【補正対象書類名】明細書
【補正対象項目名】００２０
【補正方法】変更
【補正内容】
【００２０】
【発明の効果】以上詳述した通り、本発明の膜分離装置
の洗浄方法によれば、槽内を散気することにより波を発
生させながら槽内の保有水を排出することにより、膜面
に強固に付着した粘質状の付着物を容易かつ効率的に剥
離除去して、槽外へ排出することができる。このため、
本発明によれば、膜モジュールの透過流束を高く維持す
ることが可能とされ、膜分離処理効率は大幅に向上す
る。────────────────────────────────────────────────── ───
[Procedure amendment] [Date of submission] July 17, 2002 (2002.7.1
7) [Procedure amendment 1] [Document name to be amended] Description [Item name to be amended] Claim 1 [Correction method] Change [Content of amendment] [Claim 1] A membrane module is suspended in a tank and What is claimed is: 1. A method for cleaning a membrane separation apparatus, comprising: providing a diffuser below a membrane module in a tank; and discharging water in the tank while generating waves by the diffusion. [Procedure amendment 2] [Document name to be amended] Description [Item name to be amended] 0007 [Correction method] Change [Contents of amendment] [Means for Solving the Problems] The method for cleaning a membrane separation apparatus of the present invention In a membrane separation device in which a membrane module is suspended in a tank and an aeration unit is provided below the membrane module in the tank, water is discharged from the tank while generating waves by aeration. It is characterized by the following. [Procedure amendment 3] [Document name to be amended] Description [Item name to be amended] 0020 [Correction method] Change [Content of amendment] As described in detail above, the membrane separation apparatus of the present invention According to the cleaning method, waves are generated by diffusing the inside of the tank.
By discharging the water retained in the tank while growing, viscous deposits firmly adhered to the film surface can be easily and efficiently peeled off and discharged to the outside of the tank. For this reason,
According to the present invention, the permeation flux of the membrane module can be kept high, and the efficiency of membrane separation treatment is greatly improved.
Claims (1)
に、該槽内の膜モジュールの下方に散気手段を設けた膜
分離装置において、散気を行ないながら該槽内の水の排
出を行なうことを特徴とする膜分離装置の洗浄方法。Claims: 1. In a membrane separation apparatus having a membrane module suspended in a tank and a diffuser provided below the membrane module in the tank, the inside of the tank is diffused. A method for cleaning a membrane separation device, comprising discharging water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002208079A JP3630152B2 (en) | 2002-07-17 | 2002-07-17 | Operation method of membrane separator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002208079A JP3630152B2 (en) | 2002-07-17 | 2002-07-17 | Operation method of membrane separator |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19245593A Division JP3351037B2 (en) | 1993-08-03 | 1993-08-03 | Cleaning method for membrane separation equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003038939A true JP2003038939A (en) | 2003-02-12 |
| JP3630152B2 JP3630152B2 (en) | 2005-03-16 |
Family
ID=19195826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002208079A Expired - Lifetime JP3630152B2 (en) | 2002-07-17 | 2002-07-17 | Operation method of membrane separator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3630152B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006255567A (en) * | 2005-03-16 | 2006-09-28 | Kurita Water Ind Ltd | Immersion type membrane separation device and its chemical washing method |
-
2002
- 2002-07-17 JP JP2002208079A patent/JP3630152B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006255567A (en) * | 2005-03-16 | 2006-09-28 | Kurita Water Ind Ltd | Immersion type membrane separation device and its chemical washing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3630152B2 (en) | 2005-03-16 |
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