JPH05277346A - Detection of failure of separating membrane of membrane filter device - Google Patents
Detection of failure of separating membrane of membrane filter deviceInfo
- Publication number
- JPH05277346A JPH05277346A JP8013092A JP8013092A JPH05277346A JP H05277346 A JPH05277346 A JP H05277346A JP 8013092 A JP8013092 A JP 8013092A JP 8013092 A JP8013092 A JP 8013092A JP H05277346 A JPH05277346 A JP H05277346A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- membrane
- air
- separation membrane
- pipe
- 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
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、分離膜と、その分離膜
に対する逆洗用エアー供給装置とを備えた膜濾過装置に
おいて、前記分離膜の破損を検知する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting breakage of a separation membrane in a membrane filtration device equipped with the separation membrane and an air supply device for backwashing the separation membrane.
【０００２】[0002]
【従来の技術】従来、この種の膜濾過装置の分離膜の破
損を検知するには、濾液の濁度を目視で観察する方法に
頼っていた。2. Description of the Related Art Conventionally, in order to detect breakage of a separation membrane of this type of membrane filtration device, a method of visually observing the turbidity of the filtrate has been used.
【０００３】[0003]
【発明が解決しようとする課題】ところが、この方法で
は、濁度の判定に個人差があり、そのため分離膜破損の
有無の判断ミスが伴いやすい欠点があった。そこで、本
発明の目的は、個人差なく簡単で確実な膜濾過装置の分
離膜破損検知方法を提供することにある。However, this method has a drawback in that there is an individual difference in the determination of the turbidity, and thus it is easy to make an error in determining whether or not the separation membrane is damaged. Therefore, an object of the present invention is to provide a simple and reliable method for detecting separation membrane breakage of a membrane filtration device without individual differences.
【課題を解決するための手段】この目的を達成するため
の本発明による膜濾過装置の分離膜の破損検知方法の特
徴手段は、分離膜の一方の面が液に接触している状態
で、逆洗用エアー供給装置から前記分離膜に対する濾液
回収側の管内にエアーを加圧供給し、前記管内を、予め
測定してある前記分離膜に対する逆洗のための最低限供
給圧よりも高い圧力にした状態で、上記逆洗用エアー供
給装置からのエアーの供給を止めて前記管内を気密に保
持し、この時点から設定時間後の前記管内における圧力
変化を検出して、その検出圧力が前記逆洗のための最低
限供給圧よりも下がらなかった場合は異常がないものと
判断し、その検出圧力が前記逆洗のための最低限供給圧
よりも下がった場合は異常があるものと判断するところ
にある。[Means for Solving the Problems] A characteristic means of a method for detecting damage to a separation membrane of a membrane filtration device according to the present invention for achieving this object is that one surface of the separation membrane is in contact with a liquid. Air is supplied under pressure from the backwashing air supply device into the tube on the filtrate recovery side for the separation membrane, and the inside pressure of the tube is higher than the minimum supply pressure for backwashing the separation membrane that has been measured in advance. In this state, the air supply from the backwash air supply device is stopped to keep the inside of the pipe airtight, and from this time, the pressure change in the pipe after a set time is detected, and the detected pressure is If it does not fall below the minimum supply pressure for backwashing, it is judged that there is no abnormality, and if the detected pressure falls below the minimum supply pressure for backwashing, it is judged that there is abnormality. There is a place to do it.
【０００４】[0004]
【作用】破損のない新しい分離膜の一方の面を液に接触
させた状態で、分離膜を通して液中に気泡が送り込まれ
るように、前記分離膜に対する濾液回収側からエアーを
加圧供給し、エアーの供給を止めて上述の分離膜に対す
る濾液回収側の管内を気密に保つと、前記気泡の発生が
次第に少なくなり、前記管内の空気圧がある程度下がっ
たところで気泡の発生が止まる。このときの管内圧力、
即ち前記分離膜に対する逆洗のための最低限供給圧を測
定しておく。破損の有無を調べようとする分離膜がもし
も破損のない正常な状態にあるならば、同様の手順を踏
み、エアーの供給を止めて上述の分離膜に対する濾液回
収側の管内を気密に保つと、前記管内の圧力が前記最低
限供給圧よりも下がることはないが、分離膜に破損があ
れば、破損箇所からエアーが漏れるので前記管内が前記
最低限供給圧よりも低い圧力になる。従って、エアーを
止めた時点から設定時間後の前記管内における圧力変化
を検出して、その検出圧力が前記逆洗のための最低限供
給圧よりも下がらなかった場合は異常がないものと判断
し、その検出圧力が前記逆洗のための最低限供給圧より
も下がった場合は異常があるものと判断することができ
る。[Function] With one surface of a new undamaged separation membrane in contact with a liquid, air is pressure-supplied from the filtrate recovery side of the separation membrane so that air bubbles are sent into the liquid through the separation membrane, When the supply of air is stopped and the inside of the filtrate recovery side tube with respect to the separation membrane is kept airtight, the generation of the bubbles is gradually reduced, and the generation of bubbles is stopped when the air pressure in the tube is lowered to some extent. Pipe pressure at this time,
That is, the minimum supply pressure for backwashing the separation membrane is measured. If the separation membrane whose damage is to be examined is in a normal state without breakage, follow the same procedure and stop the air supply to keep the inside of the filtrate collection side tube for the separation membrane airtight. Although the pressure in the pipe does not fall below the minimum supply pressure, if the separation membrane is damaged, air leaks from the damaged portion, so that the pressure in the pipe becomes lower than the minimum supply pressure. Therefore, it is judged that there is no abnormality if the pressure change in the pipe after the set time from the time when the air is stopped is detected and the detected pressure does not fall below the minimum supply pressure for the backwash. If the detected pressure falls below the minimum supply pressure for backwashing, it can be determined that there is an abnormality.
【０００５】[0005]
【発明の効果】個人差なく簡単で確実な膜濾過装置の分
離膜破損検知方法を提供することができた。尚、前記設
定時間を長くとれば、実操業に差し支えない程度の小さ
な破損でも検知することができるので、破損が大きくな
って支障が生じる前にその予測が付きやすく、例えば、
高価な固形分や、微量でも有害な固形分を分離する等、
特に確実な濾過が要求される場合であっても、これを流
出するような事態が起こる前に、早期に正常な分離膜と
交換し、確実な濾過処理を期することができる。EFFECTS OF THE INVENTION It is possible to provide a simple and reliable method for detecting damage to a separation membrane of a membrane filtration device that does not differ among individuals. It should be noted that if the set time is set to be long, it is possible to detect even a small breakage that does not interfere with actual operation, so it is easy to predict the damage before it becomes large and troubles occur, for example,
Separation of expensive solids and harmful solids even in trace amounts
Even in the case where particularly reliable filtration is required, it is possible to replace the normal separation membrane with a normal separation membrane at an early stage to ensure a reliable filtration process before such a situation occurs.
【０００６】[0006]
【実施例】以下、本発明による膜濾過装置の分離膜破損
検知方法の実施例を図に基づいて説明する。図１は、膜
濾過装置１を活性汚泥による汚水処理槽２内の被処理液
に浸漬して、ポンプＰの負圧により槽内の被処理液を吸
引濾過する汚水処理装置の概要を示す説明図である。膜
濾過装置１は多孔質のセラミックパイプからなる前記分
離膜の膜エレメントを複数並列に接続して構成してあ
る。図中Ｃは逆洗用エアー供給装置たるエアーコンプレ
ッサーであり、３、４は開閉バルブである。通常の濾過
を行うときは、バルブ４を閉じ、バルブ３を開いて、ポ
ンプＰの負圧により槽内の被処理液を膜濾過装置１の前
記分離膜を通して吸引濾過し、濾液だけを槽外に排出で
きるようにしてある。又、バルブ３を閉じ、バルブ４を
開いてエアーコンプレッサーＣによりエアーを加圧供給
し、加圧エアーを通常の濾過時とは逆方向に分離膜を通
過させて、主に分離膜の被処理液側に付着した固形分を
剥離させる所謂逆洗（逆圧洗浄）を行うことができる。
Ｓは、エアーコンプレッサーＣから膜濾過装置１に通ず
る配管の膜濾過装置１に近い管内のエアー圧を検出する
ための圧力ゲージである。上記の構成によって、分離膜
の破損の有無を次のようにして検知することができた。
破損のない新しい分離膜を備えた膜濾過装置１を被処理
液中に浸漬し、分離膜を通して液中に気泡が送り込まれ
るように、エアーコンプレッサーＣから膜濾過装置１に
エアーをゲージ圧２ｋｇ／ｃｍ2（以後、圧力は全てゲ
ージ圧で示す）で加圧供給し、エアーの供給を止めて分
離膜に対する濾液回収側の管内を気密に保つと、約３０
秒で前記管内の空気圧が１ｋｇ／ｃｍ2に下がり、更に
そのまま放置すると前記気泡の発生が次第に少なくな
り、約５分後に、前記圧力ゲージＳの示すゲージ圧が
０．９ｋｇ／ｃｍ2まで下がったところで気泡の発生が
止まった。この圧力以下では逆洗を行うことができな
い。つまり、この仕様の分離膜に対する逆洗を行うため
のエアーの最低限供給圧は約０．９ｋｇ／ｃｍ2であ
る。上述の逆洗用エアー供給装置からのエアーの供給を
止めて前記管内を気密に保持した時点からの経過時間ｔ
とこれに対応する前記管内における圧力ｐを、前者を横
軸に、後者を縦軸にとって、定性的にグラフ化すると図
２に示すごとく表すことができる。図中Ｎは新しい分離
膜における場合を示し、Ｌは逆洗を行うための最低限供
給圧を示す。例えば上述の新しい分離膜では、Ｌは約
０．９ｋｇ／ｃｍ 2である。破損の有無を調べようとす
る使用中の分離膜が上述の分離膜と同じ仕様であって、
破損のない正常な状態にあるときには、上述の手順と同
様の手順を踏み、エアーの供給を止めて上述の分離膜に
対する濾液回収側の管内を気密に保つと、前記管内の圧
力が前記最低限供給圧よりも下がることはなく、図２の
曲線Ｇで示されるように、一般的にはＬよりもやや高い
管内圧力で平衡状態が得られる。分離膜に破損があった
り、或いは分離膜の取り付け箇所等に異常があれば、破
損箇所等からエアーが漏れるので前記管内が前記最低限
供給圧よりも低い圧力となり、漏れが大きい場合は、図
２の曲線Ｗで示されるように、例えば、約３０秒で０．
１ｋｇ／ｃｍ2付近まで下がる急激な圧力降下が確認さ
れた。前記エアー漏れの少ない場合は、エアー漏れの大
きい場合に比べると上述の管内における圧力低下が少な
い。しかし、実際の濾過を行うには差し支えのない程度
の小さな破損を生じた分離膜の場合であっても、多少と
も前記エアー漏れがあれば、図２の曲線Ｂで示されるよ
うに、例えば５０〜１８０秒後には前記最低供給圧より
も明らかに低い圧力に至る圧力降下が認められる。従っ
て、エアーを止めた時点から設定時間、例えば３０秒後
の前記管内における圧力変化を前記圧力ゲージＳで検出
し、その検出圧力が前記逆洗のための最低限供給圧より
も下がらなかった場合は異常がないものと判断し、その
検出圧力が前記逆洗のための最低限供給圧よりも下がっ
た場合は異常があるものと判断することができる。分離
膜の異常の有無は前記圧力ゲージＳの目盛りを直接読み
取ることにより判断してもよいが、例えば、逆洗完了後
エアーを止めて前記管内を気密に保ち、一定時間経過後
の前記管内における圧力変化を自動的に検出して、その
検出圧力が前記逆洗のための最低限供給圧よりも下がっ
た場合は警報が発せられるようにする等、異常の有無を
自動的に検知する構成にしてもよい。EXAMPLES Hereinafter, separation membrane damage of the membrane filtration device according to the present invention
An embodiment of the detection method will be described with reference to the drawings. Figure 1 is a membrane
Liquid to be treated in the sewage treatment tank 2 using activated sludge
And soak the liquid to be treated in the tank with the negative pressure of the pump P.
It is explanatory drawing which shows the outline of the sewage treatment apparatus which carries out drawing filtration. film
The filtering device 1 is composed of a porous ceramic pipe.
It consists of multiple membrane elements connected in parallel.
It C in the figure is an air compressor that is an air supply device for backwashing.
It is a susa and 3 and 4 are opening / closing valves. Normal filtration
Valve, close valve 4, open valve 3, and
The negative pressure of the pump P causes the liquid to be treated in the tank to flow in front of the membrane filtration device 1.
Suction-filter through the separation membrane and discharge only the filtrate out of the tank.
I can do it. Also, close valve 3 and valve 4.
Open and pressurize air by air compressor C
Then, pressurize air through the separation membrane in the opposite direction to the normal filtration.
To remove the solids that adhere to the treated liquid side of the separation membrane.
So-called back washing (back pressure washing) for peeling can be performed.
S does not pass from the air compressor C to the membrane filtration device 1.
The air pressure in the pipe close to the membrane filtration device 1 of the pipe
Is a pressure gauge for. With the above configuration, the separation membrane
It was possible to detect the presence or absence of breakage in the following manner.
Treat the membrane filtration device 1 with a new separation membrane without damage
Immerse in the liquid, and bubbles are sent into the liquid through the separation membrane.
So that from the air compressor C to the membrane filtration device 1
Air pressure gauge 2kg / cm2(After that, all pressure
Pressure) to stop the air supply and
If the inside of the tube on the filtrate recovery side of the membrane is kept airtight, it will be about 30
The air pressure in the pipe is 1 kg / cm per second.2Down to
If left as it is, the generation of bubbles will gradually decrease.
After about 5 minutes, the gauge pressure indicated by the pressure gauge S is
0.9 kg / cm2Bubbles are generated when it goes down to
Stopped. Backwash cannot be performed below this pressure
Yes. In other words, in order to backwash the separation membrane of this specification
The minimum supply pressure of air is about 0.9 kg / cm2And
It Supply the air from the above-mentioned backwash air supply device.
Elapsed time t from the time when the tube is stopped and the inside of the tube is kept airtight
And the pressure p in the pipe corresponding to this
The graph is qualitatively plotted with the latter on the axis and the latter on the vertical axis.
It can be expressed as shown in 2. N in the figure is a new separation
In the case of membrane, L is the minimum supply for backwashing.
Indicates the supply pressure. For example, in the above-mentioned new separation membrane, L is about
0.9 kg / cm 2Is. Trying to check for damage
The separation membrane in use has the same specifications as the separation membrane described above,
When in normal condition with no damage, follow the procedure above.
Follow the same procedure to stop the air supply and use the above separation membrane.
On the other hand, if the inside of the tube on the filtrate recovery side is kept airtight, the pressure inside the tube will be
The force does not fall below the minimum supply pressure shown in Fig. 2.
Generally slightly higher than L, as shown by curve G
An equilibrium state is obtained by the pressure in the pipe. The separation membrane was damaged
If there is something wrong with the
Since air leaks from damaged parts, the inside of the pipe is at the minimum
If the pressure is lower than the supply pressure and the leak is large,
As shown by the curve W of 2, for example, 0.
1 kg / cm2A sudden pressure drop to the vicinity was confirmed.
It was If the air leakage is small, the air leakage is large.
The pressure drop in the pipe is smaller than that in the threshold
Yes. However, there is no problem in performing actual filtration.
Even if the separation membrane has a small breakage,
If there is air leakage, it will be shown by curve B in FIG.
As described above, for example, after 50 to 180 seconds,
However, a pressure drop to a clearly low pressure is recognized. Obey
Then, after the air is stopped, the set time, for example 30 seconds later
Of pressure change in the pipe of the
However, the detected pressure is lower than the minimum supply pressure for backwashing.
If it does not go down, it is judged that there is no abnormality, and the
The detected pressure is lower than the minimum supply pressure for backwashing.
If it does, it can be judged that there is an abnormality. Separation
Read the scale of the pressure gauge S directly to see if there is any abnormality in the membrane.
It may be judged by taking it, for example, after backwashing is completed.
Turn off the air to keep the inside of the tube airtight, and after a certain period of time
The pressure change in the pipe of
The detected pressure is lower than the minimum supply pressure for backwashing.
If there is an abnormality, make sure that an alarm is issued
You may make it the structure which detects automatically.
【０００７】尚、特許請求の範囲の項に図面との対照を
便利にするために符号を記すが、該記入により本発明は
添付図面の構成に限定されるものではない。It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.
【図１】本発明による膜濾過装置の分離膜破損検知方法
の手順を示すための説明図FIG. 1 is an explanatory diagram showing a procedure of a separation membrane damage detection method of a membrane filtration device according to the present invention.
【図２】分離膜の破損が管内の圧力降下に及ぼす影響を
定性的に示す曲線グラフFIG. 2 is a curve graph qualitatively showing the influence of the breakage of the separation membrane on the pressure drop in the tube.
１ 膜濾過装置 Ｃ 逆洗用エアー供給装置 1 Membrane Filtration Device C Back Washing Air Supply Device
Claims (1)
アー供給装置とを備えた膜濾過装置（１）において、前
記分離膜の破損を検知する方法であって、 前記分離膜の一方の面が液に接触している状態で、前記
逆洗用エアー供給装置（Ｃ）から前記分離膜に対する濾
液回収側の管内にエアーを加圧供給し、前記管内を、予
め測定してある前記分離膜に対する逆洗のための最低限
供給圧よりも高い圧力にした状態で、上記逆洗用エアー
供給装置（Ｃ）からのエアーの供給を止めて前記管内を
気密に保持し、この時点から設定時間後の前記管内にお
ける圧力変化を検出して、その検出圧力が前記逆洗のた
めの最低限供給圧よりも下がらなかった場合は異常がな
いものと判断し、その検出圧力が前記逆洗のための最低
限供給圧よりも下がった場合は異常があるものと判断す
る膜濾過装置の分離膜破損検知方法。1. A method for detecting breakage of the separation membrane in a membrane filtration device (1) comprising a separation membrane and an air supply device for backwashing the separation membrane, comprising: In the state where the surface is in contact with the liquid, air is pressure-supplied from the backwashing air supply device (C) into the filtrate recovery side pipe with respect to the separation membrane, and the inside of the pipe is subjected to the previously measured separation. With the pressure higher than the minimum supply pressure for backwashing the membrane, the air supply from the backwashing air supply device (C) is stopped to keep the inside of the pipe airtight, and set from this point. After detecting the pressure change in the pipe after a lapse of time, if the detected pressure does not fall below the minimum supply pressure for the backwash, it is judged that there is no abnormality, and the detected pressure is the same as that of the backwash. If it falls below the minimum supply pressure for Separation membrane damage detection method of membrane filtration device for determining that there is always.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8013092A JPH05277346A (en) | 1992-04-02 | 1992-04-02 | Detection of failure of separating membrane of membrane filter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8013092A JPH05277346A (en) | 1992-04-02 | 1992-04-02 | Detection of failure of separating membrane of membrane filter device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05277346A true JPH05277346A (en) | 1993-10-26 |
Family
ID=13709651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8013092A Pending JPH05277346A (en) | 1992-04-02 | 1992-04-02 | Detection of failure of separating membrane of membrane filter device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05277346A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2781782A1 (en) * | 1998-07-28 | 2000-02-04 | Polymem | METHOD AND DEVICE FOR FILTERING WATER BY A SUBMERSIBLE MEMBRANE |
| FR2781781A1 (en) * | 1998-07-28 | 2000-02-04 | Polymem | Submerged membrane filtration of potable water, re-using redundant sand filtration sites |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6094105A (en) * | 1983-10-27 | 1985-05-27 | Kurita Water Ind Ltd | Membrane separator |
-
1992
- 1992-04-02 JP JP8013092A patent/JPH05277346A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6094105A (en) * | 1983-10-27 | 1985-05-27 | Kurita Water Ind Ltd | Membrane separator |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2781782A1 (en) * | 1998-07-28 | 2000-02-04 | Polymem | METHOD AND DEVICE FOR FILTERING WATER BY A SUBMERSIBLE MEMBRANE |
| FR2781781A1 (en) * | 1998-07-28 | 2000-02-04 | Polymem | Submerged membrane filtration of potable water, re-using redundant sand filtration sites |
| WO2000006500A1 (en) * | 1998-07-28 | 2000-02-10 | S.A. Polymem | Method and device for membrane filtering of water |
| US6838003B1 (en) | 1998-07-28 | 2005-01-04 | S.A. Polymem | Method and device for membrane filtering of water |
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