JPH05137977A - Detection of separation membrane breakage for membrane filter - Google Patents
Detection of separation membrane breakage for membrane filterInfo
- Publication number
- JPH05137977A JPH05137977A JP30002691A JP30002691A JPH05137977A JP H05137977 A JPH05137977 A JP H05137977A JP 30002691 A JP30002691 A JP 30002691A JP 30002691 A JP30002691 A JP 30002691A JP H05137977 A JPH05137977 A JP H05137977A
- Authority
- JP
- Japan
- Prior art keywords
- separation membrane
- membrane
- pressure
- air
- bubble point
- 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、液中に浸漬される分離
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 apparatus equipped with a separation membrane immersed in a liquid 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.
【０００４】[0004]
【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中に浸漬された状態
で、逆洗用エアー供給装置からエアーをその圧力上昇を
検出しながら徐々に供給し、その検出圧力が、予め測定
してある破損のない前記分離膜のバブルポイント以上に
なる場合は前記分離膜が破損していないものと判断し、
前記バブルポイントに達しない場合は、破損しているも
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 immersed in a liquid. Air is gradually supplied from the backwash air supply device while detecting the increase in pressure, and if the detected pressure is above the bubble point of the separation membrane that has not been damaged in advance, the separation membrane is damaged. I judge that I have not done it,
If it does not reach the bubble point, it is considered to be damaged.
【０００５】[0005]
【作用】破損のない分離膜の一方の面が液中に浸漬され
た状態で、他方の面にエアー圧力を徐々にかけてゆき、
前記液中に気泡が最初に出てくる圧力即ちバブルポイン
トを予め測定しておき、これと比較して、濾過膜装置の
分離膜が破損していない場合には、分離膜の一方の面が
液中に浸漬された状態で、エアーを、その圧力上昇を検
出しながら徐々に供給してゆくと、その検出圧力は前記
バブルポイント以上になるが、濾過膜装置の分離膜が破
損している場合には、同様にしてエアーを供給しても、
前記バブルポイントよりも低い圧力で破損箇所からエア
ーが液中に漏れてしまうため、検出圧力が同様には上が
らず前記バブルポイントに達しない。従って、前記エア
ーの検出圧力が前記バブルポイント以上になれば、分離
膜が破損していないものと判断し、ある程度時間が経過
しても前記バブルポイントに達しない場合は、分離膜が
破損しているものと判断することによって、膜濾過装置
の分離膜破損の有無を確実に知ることができる。[Function] While one surface of the separation membrane without damage is immersed in the liquid, air pressure is gradually applied to the other surface,
The pressure at which bubbles first come out in the liquid, that is, the bubble point is measured in advance, and in comparison with this, when the separation membrane of the filtration membrane device is not damaged, one surface of the separation membrane is When the air is gradually supplied while being immersed in the liquid while detecting the pressure rise, the detected pressure is above the bubble point, but the separation membrane of the filtration membrane device is damaged. In that case, even if air is supplied in the same way,
Since air leaks into the liquid from the damaged portion at a pressure lower than the bubble point, the detected pressure does not rise and does not reach the bubble point. Therefore, if the detected pressure of the air is equal to or higher than the bubble point, it is determined that the separation membrane is not damaged, and if the bubble point is not reached even after a certain period of time, the separation membrane is damaged. By determining that the membrane is present, the presence or absence of damage to the separation membrane of the membrane filtration device can be reliably known.
【０００６】[0006]
【発明の効果】分離膜破損検知のためのエアーを供給す
るのに、逆洗用エアー供給装置を利用し、供給エアーの
圧力を検出するだけで、個人差なく簡単で確実に膜濾過
装置の分離膜破損の有無を検知することができるように
なった。EFFECTS OF THE INVENTION In order to supply air for detecting breakage of a separation membrane, a backwashing air supply device is used, and only by detecting the pressure of the supplied air, it is possible to easily and reliably operate the membrane filtration device without individual differences. It has become possible to detect the presence or absence of breakage of the separation membrane.
【０００７】[0007]
【実施例】以下、図に基づいて本発明による膜濾過装置
の分離膜破損検知方法を説明する。図１は膜濾過装置１
を活性汚泥による汚水処理槽２に浸漬してポンプＰの負
圧により槽内の被濾過液を吸引濾過する設備を示す説明
図である。図中Ｃは逆洗用エアー供給装置たるエアーコ
ンプレッサーである。３、４は開閉バルブである。通常
の濾過時にはバルブ４を閉じ、バルブ３を開いて濾過を
行う。Ｓは、膜濾過装置１の分離膜破損の有無を知るた
めの圧力ゲージで、前記エアーコンプレッサＣーから膜
濾過装置１に通ずる配管の途中の膜濾過装置１に近い位
置のエアー圧を検出できるようにしてある。上記の構成
によって、膜濾過装置１の分離膜破損の有無を簡単に検
知することができる。これを検知するには、ポンプＰを
止めて開閉バルブ３を閉じ、圧力ゲージＳによって前記
エアー圧を検出しながらバルブ４を開いて、エアーコン
プレッサーＣから膜濾過装置１にエアーを徐々に供給
し、その検出圧力を、同様の手順によって予め求めた破
損のない分離膜において液中に気泡が最初に出てくる圧
力即ちバブルポイントと比較して次のように判断すれば
よい。即ち、前記検出圧力が前記バブルポイント以上に
なる場合は分離膜の破損はないと判断し、エアーを供給
し続けても前記検出圧力が前記バブルポイントに達しな
い場合は分離膜そのものが破損しているか、分離膜の取
付部からリークしている等の異常があると判断すること
ができる。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、一
定時間エアーが供給されても前記検出圧力が前記バブル
ポイントに達しない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ことのできる構成に
することも容易である。尚、図２に、一定の流量で徐徐
にエアーを供給するときのエアー供給時間ｔとこれに対
応するエアーの検出圧力ｐを、前者を横軸に、後者を縦
軸にして、定性的にグラフ化したものを示す。Ｎは新し
い分離膜、Ｕは使用中の破損していない分離膜、Ｒは破
損した分離膜におけるグラフである。図中Ｂ．Ｐは新し
い分離膜におけるバブルポイントを示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for detecting damage to a separation membrane of a membrane filtration device according to the present invention will be described below with reference to the drawings. FIG. 1 shows a membrane filtration device 1
FIG. 3 is an explanatory view showing a facility for immersing the liquid in a sewage treatment tank 2 using activated sludge and suction-filtering a liquid to be filtered in the tank by a negative pressure of a pump P. In the figure, C is an air compressor which is an air supply device for backwashing. Reference numerals 3 and 4 are open / close valves. During normal filtration, the valve 4 is closed and the valve 3 is opened to perform filtration. S is a pressure gauge for knowing the presence or absence of breakage of the separation membrane of the membrane filtration device 1, and can detect the air pressure at a position near the membrane filtration device 1 on the way of the pipe leading from the air compressor C to the membrane filtration device 1. Is done. With the above configuration, it is possible to easily detect whether or not the separation membrane of the membrane filtration device 1 is damaged. In order to detect this, the pump P is stopped, the opening / closing valve 3 is closed, the valve 4 is opened while the air pressure is detected by the pressure gauge S, and air is gradually supplied from the air compressor C to the membrane filtration device 1. The detected pressure may be determined in the following manner by comparing it with the pressure at which bubbles first come out in the liquid, that is, the bubble point in the separation membrane without damage, which is obtained in advance by the same procedure. That is, when the detected pressure is equal to or higher than the bubble point, it is determined that the separation membrane is not damaged, and when the detected pressure does not reach the bubble point even if air is continuously supplied, the separation membrane itself is damaged. It is possible to determine that there is an abnormality such as a leak from the mounting portion of the separation membrane. The presence / absence of abnormality may be determined by directly reading the scale of the pressure gauge S, but for example, if the detected pressure does not reach the bubble point even if air is supplied for a certain period of time, an alarm is issued. It is also easy to adopt a configuration in which the presence or absence of an abnormality can be automatically detected. In FIG. 2, the air supply time t when the air is gradually supplied at a constant flow rate and the corresponding detected pressure p of the air are shown qualitatively with the former as the horizontal axis and the latter as the vertical axis. A graph is shown. N is a new separation membrane, U is an unbroken separation membrane in use, and R is a broken separation membrane. B in the figure. P indicates the bubble point in the new separation membrane.
【０００８】〔実験例〕図３に、分離膜の破損が供給エ
アー圧に及ぼす影響を調べた実験装置を示す。並列に連
結されたセラミック膜モジュール Ｍ１、Ｍ２、Ｍ３よ
り成る膜濾過装置１を、水を満たした処理槽２に浸漬す
ると共に、通常濾過時用の吸引ポンプＰ及び逆洗用エア
ー供給装置たるエアーコンプレッサーＣ並びにバルブ
３、４を設け、濾過と逆圧洗浄のいずれの状態にでも切
り換えられるように配管してある。セラミック膜モジュ
ールＭ１、Ｍ２、Ｍ３は、それぞれ濾過面積２．４ｍ2
の標準膜モジュールを用いた。吸引ポンプＰを停止し、
バルブ３を閉じ、バルブ４を開いて、コンプレッサーＰ
から膜濾過装置１に、通常の濾過時とは反対方向に徐々
にエアーを送りながら、圧力ゲージＳの目盛りを読み、
供給エアー圧がどこまで上がるかを、前記膜モジュール
Ｍ２だけが割れている場合、Ｍ１だけが割れている場
合、Ｍ１、Ｍ２、Ｍ３共に割れがなく正常である場合に
ついてそれぞれ調べたところ、この順に０．１kg/cm2、
０．１kg/cm2、１．５kg/cm2であった。ちなみに、濾過
面積２．４ｍ2の正常な標準膜モジュールのバブルポイ
ントは１．２kg/cm2であった。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。Experimental Example FIG. 3 shows an experimental apparatus for investigating the influence of breakage of the separation membrane on the supply air pressure. The membrane filtration device 1 composed of ceramic membrane modules M1, M2, and M3 connected in parallel is immersed in a treatment tank 2 filled with water, and a suction pump P for normal filtration and an air as a backwash air supply device are used. A compressor C and valves 3 and 4 are provided, and piping is provided so as to be able to switch between filtration and back pressure cleaning. The ceramic membrane modules M1, M2 and M3 each have a filtration area of 2.4 m 2
The standard membrane module of Stop the suction pump P,
Close valve 3 and open valve 4 to open compressor P
While gradually feeding air to the membrane filtration device 1 in the direction opposite to the normal filtration, read the scale of the pressure gauge S,
As to how much the supply air pressure increases, when the membrane module M2 alone is cracked, only M1 is cracked, and M1, M2, and M3 are normal without cracks, the results are 0 in this order. ．1kg / cm 2 ,
It was 0.1 kg / cm 2 and 1.5 kg / cm 2 . Incidentally, the bubble point of a normal standard membrane module having a filtration area of 2.4 m 2 was 1.2 kg / cm 2 . 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の破損検知方
法の説明図FIG. 1 is an explanatory diagram of a method for detecting damage to a separation membrane of a membrane filtration device according to the present invention.
【図２】分離膜の破損等の異常が供給エアーの検出圧力
に及ぼす影響を示す曲線グラフFIG. 2 is a curve graph showing the effect of abnormality such as breakage of a separation membrane on the detected pressure of supply air.
【図３】本発明による膜濾過装置の破損検知方法の実験
例FIG. 3 is an experimental example of a damage detection method for a membrane filtration device according to the present invention.
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)
に対する逆洗用エアー供給装置（Ｃ）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中に浸漬された状態で、前記
逆洗用エアー供給装置（Ｃ）からエアーをその圧力上昇
を検出しながら徐々に供給し、その検出圧力が、予め測
定してある破損のない前記分離膜のバブルポイント以上
になる場合は前記分離膜が破損していないものと判断
し、前記バブルポイントに達しない場合は、破損してい
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 damage to a separation membrane in a membrane filtration device (1) comprising a separation membrane immersed in a liquid and a backwashing air supply device (C) for the separation membrane. Then, while one surface of the separation membrane is immersed in the liquid, air is gradually supplied from the air supply device (C) for backwashing while detecting the increase in pressure, and the detected pressure is Membrane that is preliminarily measured and has no damage If it is equal to or higher than the bubble point of the separation membrane, it is determined that the separation membrane is not damaged, and if it does not reach the bubble point, it is determined that the membrane is damaged. Separation membrane damage detection method for filtration device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30002691A JPH05137977A (en) | 1991-11-15 | 1991-11-15 | Detection of separation membrane breakage for membrane filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30002691A JPH05137977A (en) | 1991-11-15 | 1991-11-15 | Detection of separation membrane breakage for membrane filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05137977A true JPH05137977A (en) | 1993-06-01 |
Family
ID=17879816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30002691A Pending JPH05137977A (en) | 1991-11-15 | 1991-11-15 | Detection of separation membrane breakage for membrane filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05137977A (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1720640A1 (en) * | 2004-02-18 | 2006-11-15 | US Filter Wastewater Group, Inc. | Continuous pressure decay test |
| US20120297862A1 (en) * | 2011-03-31 | 2012-11-29 | Krones Ag | Method of checking a membrane filtration module of a filtration plant |
| US8840783B2 (en) | 2007-05-29 | 2014-09-23 | Evoqua Water Technologies Llc | Water treatment membrane cleaning with pulsed airlift pump |
| US8858796B2 (en) | 2005-08-22 | 2014-10-14 | Evoqua Water Technologies Llc | Assembly for water filtration using a tube manifold to minimise backwash |
| US8956464B2 (en) | 2009-06-11 | 2015-02-17 | Evoqua Water Technologies Llc | Method of cleaning membranes |
| US9023206B2 (en) | 2008-07-24 | 2015-05-05 | Evoqua Water Technologies Llc | Frame system for membrane filtration modules |
| US9022224B2 (en) | 2010-09-24 | 2015-05-05 | Evoqua Water Technologies Llc | Fluid control manifold for membrane filtration system |
| US9533261B2 (en) | 2012-06-28 | 2017-01-03 | Evoqua Water Technologies Llc | Potting method |
| US9604166B2 (en) | 2011-09-30 | 2017-03-28 | Evoqua Water Technologies Llc | Manifold arrangement |
| US9675938B2 (en) | 2005-04-29 | 2017-06-13 | Evoqua Water Technologies Llc | Chemical clean for membrane filter |
| US9764289B2 (en) | 2012-09-26 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane securement device |
| US9764288B2 (en) | 2007-04-04 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane module protection |
| US9815027B2 (en) | 2012-09-27 | 2017-11-14 | Evoqua Water Technologies Llc | Gas scouring apparatus for immersed membranes |
| US9914097B2 (en) | 2010-04-30 | 2018-03-13 | Evoqua Water Technologies Llc | Fluid flow distribution device |
| US9925499B2 (en) | 2011-09-30 | 2018-03-27 | Evoqua Water Technologies Llc | Isolation valve with seal for end cap of a filtration system |
| US9962865B2 (en) | 2012-09-26 | 2018-05-08 | Evoqua Water Technologies Llc | Membrane potting methods |
| US10322375B2 (en) | 2015-07-14 | 2019-06-18 | Evoqua Water Technologies Llc | Aeration device for filtration system |
| US10427102B2 (en) | 2013-10-02 | 2019-10-01 | Evoqua Water Technologies Llc | Method and device for repairing a membrane filtration module |
-
1991
- 1991-11-15 JP JP30002691A patent/JPH05137977A/en active Pending
Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1720640A4 (en) * | 2004-02-18 | 2007-05-30 | Siemens Water Tech Corp | Continuous pressure decay test |
| EP1720640A1 (en) * | 2004-02-18 | 2006-11-15 | US Filter Wastewater Group, Inc. | Continuous pressure decay test |
| US9675938B2 (en) | 2005-04-29 | 2017-06-13 | Evoqua Water Technologies Llc | Chemical clean for membrane filter |
| US8858796B2 (en) | 2005-08-22 | 2014-10-14 | Evoqua Water Technologies Llc | Assembly for water filtration using a tube manifold to minimise backwash |
| US8894858B1 (en) | 2005-08-22 | 2014-11-25 | Evoqua Water Technologies Llc | Method and assembly for water filtration using a tube manifold to minimize backwash |
| US9764288B2 (en) | 2007-04-04 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane module protection |
| US9573824B2 (en) | 2007-05-29 | 2017-02-21 | Evoqua Water Technologies Llc | Membrane cleaning with pulsed airlift pump |
| US10507431B2 (en) | 2007-05-29 | 2019-12-17 | Evoqua Water Technologies Llc | Membrane cleaning with pulsed airlift pump |
| US8840783B2 (en) | 2007-05-29 | 2014-09-23 | Evoqua Water Technologies Llc | Water treatment membrane cleaning with pulsed airlift pump |
| US9206057B2 (en) | 2007-05-29 | 2015-12-08 | Evoqua Water Technologies Llc | Membrane cleaning with pulsed airlift pump |
| US9023206B2 (en) | 2008-07-24 | 2015-05-05 | Evoqua Water Technologies Llc | Frame system for membrane filtration modules |
| US8956464B2 (en) | 2009-06-11 | 2015-02-17 | Evoqua Water Technologies Llc | Method of cleaning membranes |
| US9914097B2 (en) | 2010-04-30 | 2018-03-13 | Evoqua Water Technologies Llc | Fluid flow distribution device |
| US10441920B2 (en) | 2010-04-30 | 2019-10-15 | Evoqua Water Technologies Llc | Fluid flow distribution device |
| US9630147B2 (en) | 2010-09-24 | 2017-04-25 | Evoqua Water Technologies Llc | Fluid control manifold for membrane filtration system |
| US9022224B2 (en) | 2010-09-24 | 2015-05-05 | Evoqua Water Technologies Llc | Fluid control manifold for membrane filtration system |
| US20120297862A1 (en) * | 2011-03-31 | 2012-11-29 | Krones Ag | Method of checking a membrane filtration module of a filtration plant |
| US10391432B2 (en) | 2011-09-30 | 2019-08-27 | Evoqua Water Technologies Llc | Manifold arrangement |
| US9604166B2 (en) | 2011-09-30 | 2017-03-28 | Evoqua Water Technologies Llc | Manifold arrangement |
| US11065569B2 (en) | 2011-09-30 | 2021-07-20 | Rohm And Haas Electronic Materials Singapore Pte. Ltd. | Manifold arrangement |
| US9925499B2 (en) | 2011-09-30 | 2018-03-27 | Evoqua Water Technologies Llc | Isolation valve with seal for end cap of a filtration system |
| US9533261B2 (en) | 2012-06-28 | 2017-01-03 | Evoqua Water Technologies Llc | Potting method |
| US9764289B2 (en) | 2012-09-26 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane securement device |
| US9962865B2 (en) | 2012-09-26 | 2018-05-08 | Evoqua Water Technologies Llc | Membrane potting methods |
| US9815027B2 (en) | 2012-09-27 | 2017-11-14 | Evoqua Water Technologies Llc | Gas scouring apparatus for immersed membranes |
| US10427102B2 (en) | 2013-10-02 | 2019-10-01 | Evoqua Water Technologies Llc | Method and device for repairing a membrane filtration module |
| US11173453B2 (en) | 2013-10-02 | 2021-11-16 | Rohm And Haas Electronic Materials Singapores | Method and device for repairing a membrane filtration module |
| US10322375B2 (en) | 2015-07-14 | 2019-06-18 | Evoqua Water Technologies Llc | Aeration device for filtration system |
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