JP4962683B2 - Method for preventing clogging of spiral membrane module device - Google Patents

Method for preventing clogging of spiral membrane module device Download PDF

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JP4962683B2
JP4962683B2 JP2005080511A JP2005080511A JP4962683B2 JP 4962683 B2 JP4962683 B2 JP 4962683B2 JP 2005080511 A JP2005080511 A JP 2005080511A JP 2005080511 A JP2005080511 A JP 2005080511A JP 4962683 B2 JP4962683 B2 JP 4962683B2
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membrane module
raw water
spiral membrane
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valve
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浩三 志水
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Kurita Water Industries Ltd
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Description

本発明は、スパイラル型膜モジュール装置の目詰まりを防止する方法に関し、特に濁質の凝集状態を監視してスパイラル型膜モジュール装置の目詰まりを防止する方法に関する。   The present invention relates to a method for preventing clogging of a spiral membrane module device, and more particularly, to a method for preventing clogging of a spiral membrane module device by monitoring agglomerated state of suspended matter.

膜ろ過装置に用いられる膜モジュールとして、集水管の外周に分離膜を巻回したスパイラル型膜モジュールがある。このスパイラル型膜モジュールとしては、例えば特開平１１−１３７９７５号に開示されているようなものがある。このスパイラル型膜モジュールは、図２に示すようにシャフト１１の周りに袋状膜１２をメッシュスペーサ１３を介して巻き付けて円筒状の巻回体とし、この巻回体の後端面の外周側に透過水流出領域を内周側に濃縮水流出領域とをそれぞれ形成したものである（特許文献１参照）。   As a membrane module used for a membrane filtration apparatus, there is a spiral membrane module in which a separation membrane is wound around the outer periphery of a water collecting pipe. An example of this spiral membrane module is disclosed in JP-A-11-137975. In this spiral membrane module, as shown in FIG. 2, a bag-like membrane 12 is wound around a shaft 11 via a mesh spacer 13 to form a cylindrical wound body, and on the outer peripheral side of the rear end face of this wound body. The permeated water outflow region is formed on the inner peripheral side with the concentrated water outflow region (see Patent Document 1).

図３は、このようなスパイラル型膜モジュールを用いた膜ろ過装置の通水系統図であり、反応槽たる原水槽２１内の水がポンプ２２及び給液管路２３、開閉弁２４を介して膜分離装置本体２５に供給される。この膜分離装置本体２５は、耐圧容器内にスパイラル型膜モジュールを挿入したものであり、透過水は透過水取出管路２６から取り出され、濃縮水は濃縮水取出管路２７から取り出される。
特開平１１−１３７９７５号公報 FIG. 3 is a water flow diagram of a membrane filtration device using such a spiral membrane module, and water in the raw water tank 21 as a reaction tank passes through a pump 22, a liquid supply pipe line 23, and an on-off valve 24. It is supplied to the membrane separator main body 25. The membrane separation device main body 25 is obtained by inserting a spiral membrane module into a pressure vessel. Permeate is taken out from the permeate take-out conduit 26 and concentrated water is taken out from the concentrate take-out conduit 27.
Japanese Patent Laid-Open No. 11-137975

しかしながら、図３に示す膜ろ過装置においては、原水槽２１を反応槽として凝集剤を注入し、原水中に含まれる懸濁物質をフロック化して、ろ過に適した状態としているが、原水槽２１における凝集が悪化すると、膜モジュールに目詰まりが生じる。そして、前述したようなスパイラル型膜モジュールを用いた場合、目詰まりが生じやすいばかりか目詰まりが進行すると、膜間差圧の増大により膜の破損に至ることがある。このため、特開平１１−１３７９７５号公報では、図４に示すように該給液管路２３から枝管２８を分岐させ、該枝管２８に調整弁２９を設け、該給液管路２３のうち該枝管２８の分岐点よりも下流側に開閉弁２４を設け、該開閉弁２４よりも下流側の給液管路２３の少なくとも一部をフレキシブルチューブ３０とする膜ろ過装置が提案されている。   However, in the membrane filtration apparatus shown in FIG. 3, the flocculant is injected using the raw water tank 21 as a reaction tank, and suspended substances contained in the raw water are flocked to be in a state suitable for filtration. When the agglomeration in the membrane deteriorates, the membrane module is clogged. When the spiral membrane module as described above is used, clogging is likely to occur, and when clogging progresses, the membrane pressure may increase, resulting in membrane damage. For this reason, in Japanese Patent Laid-Open No. 11-137975, as shown in FIG. 4, a branch pipe 28 is branched from the liquid supply pipe 23, and an adjustment valve 29 is provided in the branch pipe 28. Among them, there has been proposed a membrane filtration device in which an on-off valve 24 is provided on the downstream side of the branch point of the branch pipe 28 and at least a part of the liquid supply pipe line 23 on the downstream side of the on-off valve 24 is a flexible tube 30. Yes.

この膜ろ過装置によりスパイラル型膜モジュールの目詰まりがかなり防止されるようになったが、上記装置は原水側の凝集状態を監視するものではないため、原水側の凝集状態が大きく悪化した場合には対応しきれず、目詰まりを完全には防止できないという問題がある。そこで従来は原水を孔径８〜１０μｍ程度の５Ａろ紙でろ過した後、このろ液１００ｍＬを孔径０．４５μｍのフィルターでろ過した時の最初の５００ｍＬのろ過時間をＴ１、残りの５００ｍＬのろ過時間をＴ２とした時のＭＦＦ値=Ｔ２／Ｔ１に基づき、この値が所定の値よりも大きくなったら、原水の凝集状態が悪化したと判断して、原水槽２１から膜分離装置本体２５への給水を停止するなどしていた。   This membrane filtration device has prevented the clogging of the spiral membrane module considerably, but the above device does not monitor the aggregation state on the raw water side, so when the aggregation state on the raw water side has greatly deteriorated Cannot cope with it, and clogging cannot be completely prevented. Therefore, conventionally, after filtering raw water with a 5A filter paper having a pore size of about 8 to 10 μm, the filtration time of the first 500 mL when the filtrate of 100 mL is filtered through a filter with a pore size of 0.45 μm is T1, and the remaining 500 mL is the filtration time. Based on the MFF value when T2 = T2 / T1, when this value becomes larger than a predetermined value, it is determined that the aggregation state of the raw water has deteriorated, and water is supplied from the raw water tank 21 to the membrane separation device main body 25. Had to stop.

しかしながら、このようなＭＦＦ値の測定（ＭＦＦ測定）により凝集状態を監視していたのでは、凝集状態を連続的に監視することができないため、急激に凝集状態が悪化した場合には、これが看過されてしまい、目詰まりによるスパイラル型膜モジュールの破断を完全には防止できないという問題点があった。   However, if the aggregation state is monitored by such MFF value measurement (MFF measurement), the aggregation state cannot be continuously monitored. If the aggregation state deteriorates rapidly, this is overlooked. Therefore, there is a problem that the spiral membrane module cannot be completely prevented from being broken due to clogging.

本発明は、このようなスパイラル型膜モジュール装置の目詰まりを防止する方法を提供することを目的とする。   An object of this invention is to provide the method of preventing clogging of such a spiral membrane module apparatus.

第１に本発明は、原水を貯留した反応槽内に凝集剤を注入して前記反応槽内にて前記原水中に含まれる懸濁物質をフロック化させる凝集手段と、この凝集手段の下流側に設けられたスパイラル型膜モジュール装置と、これら凝集手段及びスパイラル型膜モジュール装置とを連結する給液管路とからなる膜ろ過装置において、前記反応槽の内部または前記給液管路に凝集センサを設け、前記原水中のフロック間の空隙における濁度を連続的測定し、ここで得られた凝集状態に基づき膜ろ過装置を制御するスパイラル型膜モジュールの目詰まり防止方法を提供する（発明１）。これにより従来は原水の凝集状態を所定の時間ごとにスポット的に測定していたが、凝集センサを用いることにより連続的に凝集状態を監視することができるので、凝集不良の原水がスパイラル型膜モジュール装置に供給されるのを防止することができる。 First, the present invention includes a flocculating means for injecting a flocculant into a reaction tank in which raw water is stored and flocking suspended substances contained in the raw water in the reaction tank, and a downstream side of the flocculating means. In a membrane filtration apparatus comprising a spiral type membrane module device provided in a water supply line and a liquid supply line connecting the aggregation means and the spiral type membrane module apparatus, an aggregation sensor is provided in the reaction tank or in the liquid supply line. And providing a method for preventing clogging of a spiral membrane module that continuously measures the turbidity in the gap between flocs in the raw water and controls the membrane filtration device based on the aggregation state obtained here ( Invention 1). ). Conventionally, the aggregation state of raw water has been spot-measured every predetermined time, but the aggregation state can be continuously monitored by using an aggregation sensor. It can be prevented from being supplied to the module device.

また、第２に本発明は、前記凝集状態に異常が認められた場合には、前記反応槽と給液管路との間で原水を循環させるように制御するスパイラル型膜モジュールの目詰まり防止方法を提供する（発明２）。これにより凝集センサにより凝集状態に異常が認められたら反応槽と給液管路との間で原水を循環させることによりスパイラル型膜モジュール装置への原水の供給が停止するので、凝集不良の原水がスパイラル型膜モジュール装置に供給されるのを防止することができる。 Secondly, the present invention prevents clogging of a spiral membrane module that controls the raw water to circulate between the reaction tank and the liquid supply line when an abnormality is found in the aggregation state. A method is provided ( Invention 2). As a result, if abnormality is found in the aggregation state by the aggregation sensor, the supply of the raw water to the spiral membrane module device is stopped by circulating the raw water between the reaction tank and the liquid supply pipe line. Supplying to the spiral membrane module device can be prevented.

さらに、第３に本発明は、前記凝集状態に異常が認められた場合には、前記スパイラル型膜モジュール装置の運転を停止するように制御するスパイラル型膜モジュールの目詰まり防止方法を提供する（発明３）。これにより凝集センサにより凝集状態に異常が認められたらスパイラル型膜モジュールの運転を停止することで、凝集不良の原水がスパイラル型膜モジュール装置に供給されるのを防止することができる。
Thirdly, the present invention provides a method for preventing clogging of a spiral membrane module that performs control so as to stop the operation of the spiral membrane module device when an abnormality is found in the aggregation state. Invention 3). As a result, when an abnormality is recognized in the aggregation state by the aggregation sensor, the operation of the spiral membrane module is stopped, so that raw water with poor aggregation can be prevented from being supplied to the spiral membrane module device.

本発明のスパイラル型膜モジュールの目詰まり防止方法によれば、原水の凝集状態を連続的に監視することができるので、凝集状態が悪化したら直ちにスパイラル型膜モジュール装置の運転を制御することができるので、スパイラル型膜モジュール装置に目詰まりが生じるのを確実に防止することができる。   According to the method for preventing clogging of the spiral membrane module of the present invention, the aggregation state of the raw water can be continuously monitored, so that the operation of the spiral membrane module device can be controlled as soon as the aggregation state deteriorates. Therefore, it is possible to reliably prevent clogging of the spiral membrane module device.

以下、本発明のスパイラル型膜モジュールの目詰まり防止方法の一実施形態について添付図面を参照して詳細に説明する。図１は本実施形態のスパイラル型膜モジュールの目詰まり防止方法を適用可能な膜ろ過装置の凝集手段としての原水槽近傍を示す通水系統図であり、全体構成としては図４に示す膜ろ過装置において、フレキシブルチューブ３０を有しない以外は同じであるので同一の構成には同一の符号を付しその詳細な説明を省略する。同図において、反応槽たる原水槽２１の下側にはポンプ２２を備えた給液管路２３が接続されており、該給液管路２３の途中には枝管２８を分岐させ、この枝管２８に調整弁２９を設けている。そして、この給液管路２３のうち該枝管２８の分岐点よりも下流側に開閉弁２４を設け、該開閉弁２４よりも下流側の給液管路２３の下流側には、スパイラル型膜モジュールを備えた膜分離装置本体（図示せず）が連続している。   Hereinafter, an embodiment of a method for preventing clogging of a spiral membrane module of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a water flow system diagram showing the vicinity of a raw water tank as an aggregating means of a membrane filtration apparatus to which the method for preventing clogging of a spiral membrane module of this embodiment can be applied. The overall configuration is shown in FIG. Since the apparatus is the same except that the flexible tube 30 is not provided, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. In the figure, a liquid supply line 23 having a pump 22 is connected to the lower side of the raw water tank 21 as a reaction tank. A branch pipe 28 is branched in the middle of the liquid supply line 23. A regulating valve 29 is provided on the pipe 28. An opening / closing valve 24 is provided on the downstream side of the branch point of the branch pipe 28 in the liquid supply pipe line 23, and a spiral type is provided on the downstream side of the liquid supply pipe line 23 on the downstream side of the opening / closing valve 24. The membrane separation device main body (not shown) provided with the membrane module is continuous.

上述したような膜ろ過装置において、原水槽２１の上側には凝集センサ１と、攪拌機２と凝集剤注入路３とが設けられている一方、下側には原水ポンプ５を備えた原水供給管４が連結されている。   In the membrane filtration apparatus as described above, the aggregation sensor 1, the stirrer 2 and the flocculant injection path 3 are provided on the upper side of the raw water tank 21, while the raw water supply pipe provided with the raw water pump 5 on the lower side. 4 are connected.

そして、この凝集センサ１は測定部６と制御部７とを内蔵したコンピュータなどの情報処理装置に接続されており、この凝集センサ１は、例えば原水Ｗの中にレーザー光を放射し、このレーザーが原水Ｗの中の懸濁物質やフロックによって生じる散乱光を連続的に検出する。この散乱光は原水Ｗの濁度、すなわちフロックの部分を除く清澄度が高いほど散乱光の平均強度は低く検出されるので、測定部６は散乱光の平均強度が所定の値を超えたか否かで凝集状態の正常・異常を判断する。さらに、制御部７は、この測定部６における凝集状態の判断結果に基づき、開閉弁２４及び調整弁２９を制御できるようになっている。なお、この制御部７は、凝集剤注入機構（図示せず）や原水ポンプ５を制御可能としてもよい。   The agglomeration sensor 1 is connected to an information processing apparatus such as a computer having a measuring unit 6 and a control unit 7 built therein. The agglomeration sensor 1 emits laser light into the raw water W, for example. Continuously detects scattered light caused by suspended matter and floc in the raw water W. Since the scattered light is detected as the turbidity of the raw water W, that is, the clarification excluding the floc portion is higher, the average intensity of the scattered light is detected lower. Therefore, the measuring unit 6 determines whether the average intensity of the scattered light exceeds a predetermined value. Determine whether the aggregated state is normal or abnormal. Further, the control unit 7 can control the on-off valve 24 and the regulating valve 29 based on the determination result of the aggregation state in the measurement unit 6. The control unit 7 may control the flocculant injection mechanism (not shown) and the raw water pump 5.

前記構成につきその作用について説明する。まず、原水供給管４から原水槽２１に原水Ｗを注入したら凝集剤注入路３から凝集剤を注入し、攪拌機２により原水槽２１内を攪拌してフロックを形成する。そうしたら、凝集センサ１のレーザー光線により原水Ｗの中の懸濁物質やフロックによって生じる散乱光を連続的に検出する。   The effect | action is demonstrated about the said structure. First, when the raw water W is injected into the raw water tank 21 from the raw water supply pipe 4, the flocculant is injected from the flocculant injection path 3, and the inside of the raw water tank 21 is stirred by the stirrer 2 to form a flock. Then, the scattered light generated by the suspended matter and floc in the raw water W is continuously detected by the laser beam of the aggregation sensor 1.

そして、測定部６によりその散乱光の平均強度を判断し、凝集状態が正常、例えば、散乱光の平均強度が所定の値以下であれば、この判断結果に基づき制御部７は、開閉弁２４及び調整弁２９を制御する。すなわち、図１（ａ）に示すように開閉弁２４を開成するとともに調整弁２９を閉鎖するように制御することで、原水がポンプ２２により給液管路２３から膜分離装置本体（図示せず）に供給され、スパイラル型膜モジュールによる膜分離が行われる。   Then, the average intensity of the scattered light is determined by the measuring unit 6, and if the aggregation state is normal, for example, if the average intensity of the scattered light is not more than a predetermined value, the control unit 7 based on the determination result, the control unit 7 And the control valve 29 is controlled. That is, as shown in FIG. 1A, the on-off valve 24 is opened and the control valve 29 is controlled to be closed, so that the raw water is pumped from the liquid supply line 23 by the pump 22 (not shown). ) And membrane separation by a spiral membrane module is performed.

一方、凝集状態が異常、例えば、散乱光の平均強度が所定の値を超えるものであれば、この判断結果に基づき制御部７は、図１（ｂ）に示すように開閉弁２４を閉鎖するとともに調整弁２９を開成するように制御することで、原水は給液管路２３から枝管２８の経路を循環するようになり、膜分離装置本体（図示せず）には供給されない。これにより凝集状態が悪くなった時点で、膜分離装置本体への原水の供給がストップするので、スパイラル型膜モジュールの目詰まりを未然に防止することができるようになっている。   On the other hand, if the aggregated state is abnormal, for example, if the average intensity of the scattered light exceeds a predetermined value, the control unit 7 closes the on-off valve 24 based on the determination result as shown in FIG. At the same time, by controlling so as to open the regulating valve 29, the raw water is circulated through the path of the branch pipe 28 from the liquid supply pipe 23, and is not supplied to the membrane separation device main body (not shown). As a result, the supply of raw water to the membrane separation device main body stops when the agglomerated state deteriorates, so that the spiral membrane module can be prevented from being clogged.

上述したとおり本実施形態によれば、原水Ｗを貯留した反応槽たる原水槽２１内に凝集剤を注入して上記原水槽２１内にて前記原水Ｗ中に含まれる懸濁物質をフロック化させる凝集手段と、この凝集手段の下流側に設けられたスパイラル型膜モジュール装置を備えた膜分離装置本体と、これら凝集手段及びスパイラル型膜モジュール装置とを連結する給液管路２３とからなる膜ろ過装置において、前記原水槽２１に凝集センサ１を設け、前記原水Ｗ中のフロック間の空隙における濁度を連続的測定し、ここで得られた凝集状態に基づき膜ろ過装置を制御しているので、原水槽２１での凝集状態を連続的に監視することができるので、凝集不良の原水Ｗがスパイラル型膜モジュール装置を備えた膜分離装置本体に供給されるのを防止することができ、これによりスパイラル型膜モジュール装置の目詰まりを未然に防止することが可能となる。具体的には、凝集センサ１による凝集状態の検出に異常が認められた場合には、給液管路２３と枝管２８とに設けた開閉弁２４及び調整弁２９を制御することにより、原水槽２１と給液管路２３との間で原水を循環させるように制御する。   As described above, according to the present embodiment, a flocculant is injected into the raw water tank 21 that is a reaction tank in which the raw water W is stored, and the suspended matter contained in the raw water W is flocked in the raw water tank 21. A membrane comprising an aggregating means, a membrane separation device body provided with a spiral membrane module device provided on the downstream side of the agglomerating device, and a liquid supply line 23 connecting the aggregating device and the spiral membrane module device. In the filtration apparatus, the raw water tank 21 is provided with the aggregation sensor 1, continuously measuring the turbidity in the gap between flocs in the raw water W, and the membrane filtration apparatus is controlled based on the aggregation state obtained here. Therefore, since the aggregation state in the raw | natural water tank 21 can be monitored continuously, it can prevent that the raw | natural water W of poor aggregation is supplied to the membrane separator main body provided with the spiral membrane module apparatus. Can, thereby it becomes possible to prevent clogging of the spiral wound membrane module unit in advance. Specifically, when an abnormality is detected in the detection of the aggregation state by the aggregation sensor 1, the on-off valve 24 and the adjustment valve 29 provided in the liquid supply pipe line 23 and the branch pipe 28 are controlled to control the original. Control is performed so that the raw water is circulated between the water tank 21 and the liquid supply pipe 23.

以上本発明について前述した実施形態に基づいて説明してきたが、本発明はこの実施形態に限るものではなく、例えば凝集センサは原水槽２１でなく給液管路２３の基端部に設けて同様の制御を行ってもよい。また、制御についても凝集不良の原水がスパイラル型膜モジュール装置に供給されなければよく、凝集状態に異常が認められた場合には、前記スパイラル型膜モジュール装置の運転を停止したり、ポンプ２２を停止したりするだけでもある程度の効果が期待できる。   Although the present invention has been described based on the above-described embodiment, the present invention is not limited to this embodiment. For example, the aggregation sensor is provided not at the raw water tank 21 but at the base end portion of the liquid supply pipe 23. You may control. In addition, regarding the control, it is sufficient that the raw water with poor aggregation is not supplied to the spiral membrane module device. When an abnormality is found in the aggregated state, the operation of the spiral membrane module device is stopped or the pump 22 is turned off. You can expect a certain level of effect just by stopping.

本発明のスパイラル型膜モジュール装置の目詰まり防止方法によれば、凝集状態が悪化したら直ちにスパイラル型膜モジュール装置の運転を制御することでスパイラル型膜モジュール装置の目詰まりを確実に防止することができるので、スパイラル型膜モジュール装置の膜破断の故障の生じにくい膜ろ過装置とすることができて有用である。   According to the clogging prevention method of the spiral membrane module device of the present invention, the clogging of the spiral membrane module device can be surely prevented by controlling the operation of the spiral membrane module device as soon as the agglomerated state deteriorates. Therefore, it is possible to make a membrane filtration device that is less prone to membrane breakage of the spiral membrane module device, which is useful.

本発明の一実施形態によるスパイラル型膜モジュール装置の目詰まり防止方法の反応槽における通水系統を示す要部概略構成図であり、（ａ）は凝集正常状態の制御を、（ｂ）は凝集異常状態の制御をそれぞれ示す。It is a principal part schematic block diagram which shows the water flow system | strain in the reaction tank of the clogging prevention method of the spiral membrane module apparatus by one Embodiment of this invention, (a) is control of a normal aggregation state, (b) is aggregation. The control of abnormal state is shown respectively. スパイラル型膜モジュール装置の一例を示す断面図である。It is sectional drawing which shows an example of a spiral type membrane module apparatus. 従来のスパイラル型膜モジュール装置を備えた膜ろ過装置の一例を示す通水系統図である。It is a water flow system figure which shows an example of the membrane filtration apparatus provided with the conventional spiral type membrane module apparatus. 従来のスパイラル型膜モジュール装置を備えた膜ろ過装置の他の例を示す通水系統図である。It is a water flow system figure which shows the other example of the membrane filtration apparatus provided with the conventional spiral type membrane module apparatus.

符号の説明Explanation of symbols

１…凝集センサ
２…攪拌機（凝集手段）
３…凝集剤注入路（凝集手段）
６…測定部
７…制御部
２１…反応槽（凝集手段）
２５…膜分離装置本体
２８…枝管
Ｗ…原水
DESCRIPTION OF SYMBOLS 1 ... Aggregation sensor 2 ... Stirrer (aggregation means)
3 ... flocculant injection path (aggregation means)
6 ... Measurement unit 7 ... Control unit 21 ... Reaction tank (aggregation means)
25 ... Membrane separation device body 28 ... Branch pipe W ... Raw water

Claims (1)

原水を貯留した反応槽内に凝集剤を注入して前記反応槽内にて前記原水中に含まれる懸濁物質をフロック化させる凝集手段と、この凝集手段の下流側に設けられたスパイラル型膜モジュール装置と、これら凝集手段及びスパイラル型膜モジュール装置とを連結する給液管路とからなる膜ろ過装置におけるスパイラル型膜モジュールの目詰まり防止方法であって、
前記反応槽の内部または前記給液管路に凝集センサを設け、前記給液管路に前記スパイラル型膜モジュール装置への供給水量を調節する第１弁を設け、前記給液管路の前記第１弁よりも上流側に、前記反応槽へ原水を循環させるための枝管を設けるとともに、前記枝管に前記反応槽への循環水量を調節する第２弁を設け、前記原水中のフロック間の空隙における濁度を連続的測定し、ここで得られた凝集状態に異常が認められた場合には、前記第１弁を閉鎖するとともに前記第２弁を開成し、もって前記反応槽と前記給液管路との間で原水を循環させるように膜ろ過装置を制御することを特徴とするスパイラル型膜モジュール装置の目詰まり防止方法。 An aggregating means for injecting a flocculant into a reaction tank in which the raw water is stored to floculate suspended substances contained in the raw water in the reaction tank, and a spiral membrane provided downstream of the aggregating means A method for preventing clogging of a spiral membrane module in a membrane filtration device comprising a module device and a liquid supply line connecting the aggregation means and the spiral membrane module device,
An aggregation sensor is provided in the reaction tank or in the liquid supply line, a first valve for adjusting the amount of water supplied to the spiral membrane module device is provided in the liquid supply line, and the first of the liquid supply line is provided. A branch pipe for circulating the raw water to the reaction tank is provided upstream of the one valve, and a second valve for adjusting the amount of water circulated to the reaction tank is provided in the branch pipe, When the turbidity in the voids is continuously measured and an abnormality is found in the agglomerated state obtained here, the first valve is closed and the second valve is opened. A method for preventing clogging of a spiral membrane module device , wherein the membrane filtration device is controlled so as to circulate raw water between a liquid supply pipe line .
JP2005080511A 2005-03-18 2005-03-18 Method for preventing clogging of spiral membrane module device Expired - Fee Related JP4962683B2 (en)

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