JPH07185271A - Immersion membrane apparatus - Google Patents
Immersion membrane apparatusInfo
- Publication number
- JPH07185271A JPH07185271A JP34595793A JP34595793A JPH07185271A JP H07185271 A JPH07185271 A JP H07185271A JP 34595793 A JP34595793 A JP 34595793A JP 34595793 A JP34595793 A JP 34595793A JP H07185271 A JPH07185271 A JP H07185271A
- Authority
- JP
- Japan
- Prior art keywords
- membrane
- liquid
- units
- membranes
- membrane unit
- 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
【0001】[0001]
【産業上の利用分野】この発明は、平膜を複数枚積層し
た積層体や、中空糸膜を平面状、或いはすだれ状にした
膜エレメントを複数枚積層した積層体や、管状膜を複数
本並行に接続したものを膜ユニットとして用いた浸漬膜
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated body in which a plurality of flat membranes are laminated, a laminated body in which a plurality of membrane elements having hollow fiber membranes in a planar shape or a blind shape are laminated, and a plurality of tubular membranes. The present invention relates to a submerged membrane device that uses those connected in parallel as a membrane unit.
【0002】[0002]
【従来の技術】処理槽の液中に上述した膜ユニットを浸
漬し、膜ユニットの内部を吸引して膜を透過した濾過処
理水を得る浸漬膜装置は従来から公知である。又、膜の
下部に散気装置を設け濾過ケークを剥離させることも公
知である。2. Description of the Related Art Immersion membrane devices for immersing the above-mentioned membrane unit in the liquid of a treatment tank and sucking the inside of the membrane unit to obtain filtered treated water that has permeated the membrane have been conventionally known. It is also known to provide an air diffuser at the bottom of the membrane to separate the filter cake.
【0003】[0003]
【発明が解決しようとする課題】この浸漬膜装置を運転
して膜濾過を行うと、膜面には濃度分極層、ゲール層、
ケーク層などの非濾過物質が付着する。そして、非濾過
物質の厚さが増すと濾過抵抗が増大し、濾過圧力が高ま
って濾過効率は著しく低下する。このため膜ユニットの
下方に散気装置を設け、一定時間膜濾過運転を行った
ら、又は膜濾過運転中に一定濾過圧力になったら、運転
を中止して逆洗を行うが、この逆洗の前後に散気装置を
作動し、膜ユニットの下面全体に下から気泡を浴びせ、
膜の間を上向する気泡と、上向水流の剪断力で膜面に付
着した非濾過物質を剥離する必要がある。この場合、膜
ユニットの回りに槽内の液が下向流して循環する対流ス
ペースを保つことが必要で、処理槽内への膜の充填率が
その対流スペース分だけ減少することになる。When the immersion membrane device is operated to perform membrane filtration, a concentration polarization layer, a Gael layer,
Non-filtered material, such as cake layers, adheres. When the thickness of the non-filter substance increases, the filtration resistance increases, the filtration pressure increases, and the filtration efficiency significantly decreases. For this reason, an air diffuser is installed below the membrane unit, and when the membrane filtration operation is performed for a certain period of time, or when a certain filtration pressure is reached during the membrane filtration operation, the operation is stopped and backwashing is performed. Operate the air diffuser back and forth to expose the entire bottom surface of the membrane unit to bubbles from below.
It is necessary to separate the bubbles rising between the membranes and the non-filter substance adhering to the membrane surface by the shearing force of the upward water flow. In this case, it is necessary to maintain a convection space in which the liquid in the tank flows downward and circulates around the membrane unit, and the filling rate of the film in the treatment tank is reduced by the amount of the convection space.
【0004】[0004]
【課題を解決するための手段】そこで本発明は、処理槽
の液中に膜ユニットを浸漬し、膜を透過した濾過処理水
を得る浸漬膜装置において、複数の膜ユニットを液中の
仕切板で隔てゝ槽内液中に配置すると共に、その個々の
膜ユニットの下方に個々に散気装置を設け、散気装置を
交互に作動可能にしたことを特徴とする。Therefore, the present invention is a submerged membrane device in which a membrane unit is immersed in a liquid in a treatment tank to obtain filtered treated water that has permeated the membrane. It is characterized in that it is placed in the liquid in the tank and is separated from each other by an air diffuser provided below each of the membrane units so that the air diffusers can be alternately operated.
【0005】[0005]
【実施例】図示の各実施例において、10は処理槽で、
処理槽の液中には膜ユニット11が浸漬してあり、ポン
プ12を接続した吸引管13が膜ユニットの内部を吸引
し、処理槽内の原液中、膜ユニット11を透過したもの
を濾過処理水として採水する。膜ユニットは、前述した
ように平膜の複数枚の積層体、又は中空糸膜を平面状、
或いはすだれ状にした膜エレメントの複数枚の積層体、
又は管状膜を複数本並行に接続したものである。EXAMPLES In each of the illustrated examples, 10 is a processing tank,
The membrane unit 11 is immersed in the liquid in the treatment tank, the suction pipe 13 connected to the pump 12 sucks the inside of the membrane unit, and the raw liquid in the treatment tank that has passed through the membrane unit 11 is filtered. Collect as water. The membrane unit is, as described above, a laminate of a plurality of flat membranes, or a hollow fiber membrane in a planar shape,
Or a laminate of a plurality of blind-shaped membrane elements,
Alternatively, a plurality of tubular membranes are connected in parallel.
【0006】図1の実施例では、処理槽10内に2つの
膜ユニット11A,11Bを上端が液面下の仕切板14
で隔てゝ隣接状に配置してあり、各膜ユニット11A,
11Bの下方には個々に散気装置15A,15Bが設け
てある。4つの散気装置15A,15Bは共通のブロワ
ー16に分岐管17で接続し、管に設けた開閉弁18
A,18Bで個々に作動できるようになっている。膜濾
過運転を中止し、逆洗を行う前後に開閉弁18A,18
Bを交互に開閉し、例えば散気装置15Aから15分
間、気泡を膜ユニット11Aに浴びせ、次の15分は散
気装置15Bから気泡を膜ユニット11Bに浴びせ、こ
れを繰返す。これにより散気装置15Aから浮上する気
泡によって膜ユニット11Aの膜の間には上向流が生
じ、気泡と上向水流により膜ユニット11Aの膜面に付
着した非濾過物質は膜面から剥離し、同時に膜ユニット
11Bの膜間には下向流が生じ、この下向水流によって
膜面に付着した非濾過物質が剥離される。散気装置15
Bが作動しているときは上記とは逆で膜ユニット11B
の膜面に付着した非濾過物質は気泡と上向水流により膜
面から剥離し、膜ユニット11Aの膜面に付着した非濾
過物質は膜間に生じた下向水流で膜面から剥離する。
尚、散気は膜の運転を中止して行っても、膜の運転中に
行ってもよい。In the embodiment shown in FIG. 1, two membrane units 11A and 11B are provided in a processing tank 10 with a partition plate 14 whose upper end is below the liquid surface.
Are separated from each other and are arranged adjacent to each other, and each membrane unit 11A,
Air diffusers 15A and 15B are individually provided below 11B. The four air diffusers 15A and 15B are connected to a common blower 16 by a branch pipe 17, and an on-off valve 18 provided in the pipe.
It can be operated individually by A and 18B. Stop the membrane filtration operation and open / close valves 18A, 18 before and after backwashing.
B is alternately opened and closed, for example, air bubbles are blown on the membrane unit 11A from the air diffuser 15A for 15 minutes, and bubbles are blown on the membrane unit 11B from the air diffuser 15B for the next 15 minutes, and this is repeated. As a result, an upward flow is generated between the membranes of the membrane unit 11A due to the bubbles floating from the air diffuser 15A, and the non-filtration substance attached to the membrane surface of the membrane unit 11A is separated from the membrane surface by the bubbles and the upward water flow. At the same time, a downward flow is generated between the membranes of the membrane unit 11B, and the non-filtration substance attached to the membrane surface is separated by the downward water flow. Air diffuser 15
When B is operating, the reverse of the above, the membrane unit 11B
The non-filtration substance attached to the membrane surface is separated from the membrane surface by the air bubbles and the upward water flow, and the non-filtration substance attached to the membrane surface of the membrane unit 11A is separated from the membrane surface by the downward water flow generated between the membranes.
Aeration may be performed after the operation of the membrane is stopped or during the operation of the membrane.
【0007】図2の実施例では、処理槽10内に4つの
膜ユニット11A,11B,11C,11Dを三枚の仕
切板14A,14B,14Cで隔てゝ隣接状に配置して
あり、各膜ユニットの下方には個々に散気装置15A,
15B,15C,15Dが設けてある。4つの散気装置
は共通のブロワー16に分岐管17で接続し、分岐管に
設けた4つの開閉弁18A,18B,18C,18Dで
4つの散気装置を個々に作動することができる。膜濾過
運転を行っている間、或いは運転を中止し、逆洗の前後
に開閉弁を操作し、例えば散気装置15A,15B,1
5C,15Dの順に15分間宛作動させたり、或いは1
5Aと15C、15Bと15Dを15分間宛交互に作動
させる。作動している散気装置の上の膜ユニットの膜間
には気泡による上向流が生じ、気泡と上向水流が膜面に
付着した非濾過物質を剥離し、作動していない散気装置
の上の膜ユニットの膜間には下向流が生じ、この下向水
流が膜面に付着した非濾過物質を膜面から剥離する。In the embodiment shown in FIG. 2, four membrane units 11A, 11B, 11C and 11D are arranged in the processing tank 10 by three partition plates 14A, 14B and 14C so as to be adjacent to each other. In the lower part of the unit, individually diffuser 15A,
15B, 15C and 15D are provided. The four air diffusers are connected to a common blower 16 by a branch pipe 17, and the four open / close valves 18A, 18B, 18C, 18D provided in the branch pipe can individually operate the four air diffusers. While performing the membrane filtration operation or stopping the operation, operating the on-off valve before and after backwashing, for example, the air diffusers 15A, 15B, 1
5C, 15D in order for 15 minutes, or 1
5A and 15C and 15B and 15D are alternately operated for 15 minutes. An upward flow due to air bubbles occurs between the membranes of the membrane unit above the operating air diffuser, and the air bubbles and the upward water flow separate the non-filtration material adhering to the membrane surface, and the air diffuser is not operating. A downward flow is generated between the membranes of the membrane unit above the membrane, and this downward water flow separates the non-filtration substance adhering to the membrane surface from the membrane surface.
【0008】[0008]
【発明の効果】以上で明らかなように、散気装置を交互
に作動することで、作動している散気装置の上の膜ユニ
ットの膜間には気泡による上向流が生じ、気泡と上向水
流とにより膜面に付着した非濾過物質を剥離する。そし
て、作動を中止している散気装置の上の膜ユニットの膜
間には下向流が生じ、この下向水流が膜面に付着した非
濾過物質を剥離する。従って、下向流を生じさせる対流
スペースを膜ユニットの間に保つ必要が無くなるので、
処理槽への膜充填率が高まる。又、同じ数の膜ユニット
を充填する場合、使用する処理槽の大きさは大幅に小型
化する。As is apparent from the above, by alternately operating the air diffusers, an upward flow due to bubbles is generated between the membranes of the membrane unit above the operating air diffusers, and the The non-filter substance adhering to the membrane surface is separated by the upward flow of water. Then, a downward flow is generated between the membranes of the membrane unit above the air diffusing device that has stopped its operation, and this downward water flow separates the non-filter substance adhering to the membrane surface. Therefore, it is not necessary to keep the convection space that causes the downward flow between the membrane units,
The film filling rate in the processing tank is increased. Further, when the same number of membrane units are filled, the size of the processing tank used is greatly reduced.
【図1】本発明の浸漬膜装置の第1実施例の断面図であ
る。FIG. 1 is a sectional view of a first embodiment of an immersion membrane device of the present invention.
【図2】本発明の浸漬膜装置の他の1実施例の断面図で
ある。FIG. 2 is a sectional view of another embodiment of the immersion membrane device of the present invention.
10 処理槽 11A 膜ユニット 11B 膜ユニット 11C 膜ユニット 11D 膜ユニット 12 ポンプ 13 吸引管 14 仕切板 14A 仕切板 14B 仕切板 14C 仕切板 15A 散気装置 15B 散気装置 15C 散気装置 15D 散気装置 16 ブロワー 17 分岐管 18A 開閉弁 18B 開閉弁 18C 開閉弁 18D 開閉弁 10 Treatment Tank 11A Membrane Unit 11B Membrane Unit 11C Membrane Unit 11D Membrane Unit 12 Pump 13 Suction Pipe 14 Partition Plate 14A Partition Plate 14B Partition Plate 14C Partition Plate 15A Air Diffuser 15B Air Diffuser 15C Air Diffuser 15D Blower 16 17 Branch pipe 18A Open / close valve 18B Open / close valve 18C Open / close valve 18D Open / close valve
Claims (1)
を透過した濾過処理水を得る浸漬膜装置において、複数
の膜ユニットを液中の仕切板で隔てゝ槽内液中に配置す
ると共に、その個々の膜ユニットの下方に個々に散気装
置を設け、散気装置を交互に作動可能にしたことを特徴
とする浸漬膜装置。1. A submerged membrane device in which a membrane unit is immersed in a liquid in a treatment tank to obtain filtered treated water that has permeated the membrane, and a plurality of membrane units are separated by a partition plate in the liquid and arranged in the liquid in the tank. In addition, the submerged membrane device is characterized in that the air diffusers are individually provided below the respective membrane units so that the air diffusers can be alternately operated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP34595793A JP3341428B2 (en) | 1993-12-24 | 1993-12-24 | Operating method of immersion membrane device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP34595793A JP3341428B2 (en) | 1993-12-24 | 1993-12-24 | Operating method of immersion membrane device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07185271A true JPH07185271A (en) | 1995-07-25 |
JP3341428B2 JP3341428B2 (en) | 2002-11-05 |
Family
ID=18380157
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP34595793A Expired - Fee Related JP3341428B2 (en) | 1993-12-24 | 1993-12-24 | Operating method of immersion membrane device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3341428B2 (en) |
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-
1993
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