JPH1033957A - Filtration treatment method and filtration apparatus - Google Patents
Filtration treatment method and filtration apparatusInfo
- Publication number
- JPH1033957A JPH1033957A JP19876596A JP19876596A JPH1033957A JP H1033957 A JPH1033957 A JP H1033957A JP 19876596 A JP19876596 A JP 19876596A JP 19876596 A JP19876596 A JP 19876596A JP H1033957 A JPH1033957 A JP H1033957A
- Authority
- JP
- Japan
- Prior art keywords
- filtration
- filtration membrane
- stock solution
- pressure
- filtrate
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、原液を循環しなが
ら濾過を行う濾過装置に係り、詳細には、河川水、湖沼
水、地下水或いは海水等を原水としてクロスフロー型の
精密濾過または限外濾過装置により大量に浄化する水処
理に好適な濾過技術に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration device for performing filtration while circulating undiluted liquid, and more particularly, to cross-flow type microfiltration or ultrafiltration using river water, lake water, groundwater or seawater as raw water. The present invention relates to a filtration technique suitable for water treatment in which a large amount is purified by a filtration device.
【０００２】[0002]
【従来の技術】クロスフロー型の精密濾過または限外濾
過装置において、濾過能力の維持のために循環濾過法が
用いられているが、従来のこの種の濾過装置において
は、濾過処理中は定流量運転や定圧運転方式で稼働し、
濾過膜に蓄積した懸濁物質を排除する逆洗やエアバブリ
ング時には、例えば、特開平7-275671号公報に開示され
たように循環側を停止して濾過膜内の液を抜いたり、空
気と置換して運転する方式となっているのが一般であ
る。2. Description of the Related Art In a cross-flow type microfiltration or ultrafiltration apparatus, a circulating filtration method is used to maintain the filtration capacity. Operated by flow rate operation or constant pressure operation method,
At the time of backwashing or air bubbling to eliminate suspended substances accumulated in the filtration membrane, for example, stop the circulation side to drain the liquid in the filtration membrane as described in JP-A-7-275671, or remove air from the filtration membrane. In general, the system is operated with replacement.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前述の
従来の技術では、逆洗やエアバブリング時に、循環側を
停止して濾過膜内の液を抜いたり、空気と置換して運転
した後、通常の濾過処理を開始する際に、濾過膜及び配
管内の液が抜かれた状態であるため比較的軽負荷となっ
て原液循環ポンプの回転数が不安定となり、場合によっ
ては、原液循環ポンプの送り圧力が増大して濾過膜の耐
圧限界を超える虞がある。However, in the above-mentioned prior art, during backwashing or air bubbling, the circulation side is stopped to drain the liquid in the filtration membrane, or to operate after replacing the air with air. When the filtration process is started, the liquid in the filtration membrane and the pipe is drained, so that the load becomes relatively light and the rotation speed of the stock solution circulating pump becomes unstable. The pressure may increase to exceed the pressure resistance limit of the filtration membrane.
【０００４】本発明は前記課題を解決するものであり、
その目的とするところは、濾過膜に蓄積した懸濁物質を
排除する逆洗、エアバブリングまたは停止状態からの濾
過処理開始への切り換え時に安定した運転が出来る濾過
処理方法及びこれを実施する濾過装置を提供せんとする
ものである。[0004] The present invention is to solve the above problems,
The purpose thereof is a filtration method capable of performing a stable operation at the time of switching from a backwashing, air bubbling or a stop state to a filtration processing start for removing suspended substances accumulated in a filtration membrane, and a filtration apparatus for performing the same. Is to be provided.
【０００５】[0005]
【課題を解決するための手段】前記目的を達成するため
の本発明に係る濾過処理方法は、原液を循環しながら濾
過を行うクロスフロー型の精密濾過または限外濾過処理
方法において、濾過膜に蓄積した懸濁物質を排除する逆
洗、エアバブリングまたは停止状態からの濾過処理開始
への切り換え時に濾過膜への原液の入力圧力を所定時間
低圧運転するように構成したことを特徴とする。According to the present invention, there is provided a cross-flow type microfiltration or ultrafiltration method for performing filtration while circulating a stock solution. The system is characterized in that the input pressure of the undiluted solution to the filtration membrane is reduced for a predetermined period of time at the time of switching from the backwashing, air bubbling or the stop state to the start of the filtration treatment for removing accumulated suspended substances.
【０００６】また、前記方法を適用した濾過装置の第１
の構成は、原液を循環しながら濾過を行うクロスフロー
型の精密濾過または限外濾過装置において、濾過膜の上
流側に該濾過膜への原液の入力圧力を検知する圧力セン
サを設け、該圧力センサの検知情報に対応して原液循環
ポンプの出力を制御するインバータを有することを特徴
とする。[0006] The first of the filtration devices to which the above method is applied.
Is a cross-flow type microfiltration or ultrafiltration apparatus that performs filtration while circulating the undiluted solution, in which a pressure sensor for detecting the input pressure of the undiluted solution to the filtration membrane is provided upstream of the filtration membrane. It has an inverter for controlling the output of the stock solution circulating pump in accordance with the detection information of the sensor.
【０００７】本発明は、上述の如く構成したので、濾過
膜に蓄積した懸濁物質を排除する逆洗、エアバブリング
または停止状態からの濾過処理開始への切り換え時に、
濾過膜の上流側に設けた圧力センサの検知情報に対応し
てインバータが原液循環ポンプの出力を制御して濾過膜
への原液の入力圧力を所定時間低圧運転することが出
来、これにより濾過膜が保護されて安定運転することが
出来る。Since the present invention is configured as described above, when switching from backwashing, air bubbling, or a stop state to the start of the filtration process to eliminate suspended substances accumulated in the filtration membrane,
The inverter controls the output of the stock solution circulating pump in accordance with the detection information of the pressure sensor provided on the upstream side of the filtration membrane, so that the input pressure of the stock solution to the filtration membrane can be operated at a low pressure for a predetermined time. Is protected and stable operation is possible.
【０００８】また、前記方法を適用した濾過装置の第２
の構成は、原液を循環しながら濾過を行うクロスフロー
型の精密濾過または限外濾過装置において、濾過液流路
に該濾過液流路を流通する濾過液の流量を検知する流量
センサを設けると共に、濾過膜の上流側に該濾過膜への
原液の入力圧力を検知する圧力センサを設け、前記流量
センサの検知情報及び前記圧力センサの検知情報に選択
的に対応して原液循環ポンプの出力を制御するインバー
タを有し、通常の濾過処理状態では前記流量センサの検
知情報に基づいてインバータが原液循環ポンプの出力を
制御して濾過液を定流量運転し、濾過膜に蓄積した懸濁
物質を排除する逆洗、エアバブリングまたは停止状態か
らの濾過処理開始への切り換え時に前記圧力センサの検
知情報に基づいてインバータが原液循環ポンプの出力を
制御して濾過膜への原液の入力圧力を所定時間低圧運転
するように構成したことを特徴とする。[0008] The second aspect of the filtration apparatus to which the above method is applied.
Is a cross-flow type microfiltration or ultrafiltration device that performs filtration while circulating the undiluted solution, and a flow rate sensor that detects the flow rate of the filtrate flowing through the filtrate flow path in the filtrate flow path is provided. A pressure sensor is provided upstream of the filtration membrane for detecting the input pressure of the undiluted solution to the filtration membrane, and the output of the undiluted solution circulating pump selectively corresponds to the detection information of the flow rate sensor and the detection information of the pressure sensor. It has an inverter to control, and in a normal filtration processing state, the inverter controls the output of the stock solution circulating pump based on the detection information of the flow rate sensor to operate the filtrate at a constant flow rate, and removes suspended matter accumulated in the filtration membrane. The inverter controls the output of the stock solution circulating pump based on the detection information of the pressure sensor at the time of switching from the backwashing, air bubbling or the stop state to the start of the filtration process to eliminate, and to the filtration membrane. Characterized by being configured to low pressure operation a predetermined time an input pressure of the stock solution.
【０００９】上記第２の構成によれば、通常の濾過処理
状態では濾過液流路に設けた流量センサの検知情報に基
づいてインバータが原液循環ポンプの出力を制御して濾
過液の流量が一定流量になるように運転し、濾過膜に蓄
積した懸濁物質を排除する逆洗、エアバブリングまたは
停止状態からの濾過処理開始への切り換え時に濾過膜の
上流側に設けた圧力センサの検知情報に基づいて前記イ
ンバータが原液循環ポンプの出力を制御して濾過膜への
原液の入力圧力を所定時間低圧運転させることが出来、
これにより濾過膜が保護されて安定運転することが出来
る。According to the second configuration, in a normal filtration state, the inverter controls the output of the raw liquid circulation pump based on the detection information of the flow rate sensor provided in the filtrate flow path, so that the flow rate of the filtrate is constant. Operates to the flow rate and removes suspended solids accumulated in the filtration membrane. The inverter can control the output of the stock solution circulation pump based on the stock solution to operate the stock solution input pressure to the filtration membrane at a low pressure for a predetermined time,
This protects the filtration membrane and allows stable operation.
【００１０】また、前記インバータの周波数を変化させ
て前記原液循環ポンプの回転数を変化させるように構成
すれば好ましい。It is preferable that the frequency of the inverter is changed to change the rotation speed of the stock solution circulating pump.
【００１１】[0011]
【発明の実施の形態】図により本発明に係る濾過処理方
法及びこれを用いた濾過装置の一実施形態を具体的に説
明する。図１は本発明に係る濾過装置を適用した濾過シ
ステムの一例を示す全体図、図２は本発明に係る濾過装
置の通常運転時において、濾過液を定流量運転する構成
を示す模式図、図３は本発明に係る濾過装置において、
濾過膜に蓄積した懸濁物質を排除する逆洗、エアバブリ
ングまたは停止状態からの濾過処理開始への切り換え時
に濾過膜への原液の入力圧力を所定時間低圧運転する構
成を示す模式図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of a filtration method and a filtration apparatus using the same according to the present invention will be specifically described. FIG. 1 is an overall view showing an example of a filtration system to which a filtration device according to the present invention is applied, and FIG. 2 is a schematic diagram showing a configuration for performing a constant flow operation of a filtrate during a normal operation of the filtration device according to the present invention. 3 is a filtration device according to the present invention,
FIG. 9 is a schematic diagram showing a configuration in which the input pressure of the stock solution to the filtration membrane is reduced for a predetermined time during switching from backwashing, air bubbling, or a stop state to the start of filtration processing for removing suspended substances accumulated in the filtration membrane.
【００１２】図１に示す濾過システムは、原液を循環し
ながら濾過を行うクロスフロー型の精密或いは限外濾過
装置として構成される。ここでは、濾過装置にクロスフ
ロー方式の中空糸状膜で構成される濾過膜モジュール４
が並列に６個設置されて構成された一例を示す。The filtration system shown in FIG. 1 is configured as a cross-flow type precision or ultrafiltration device that performs filtration while circulating a stock solution. Here, a filtration membrane module 4 composed of a cross-flow type hollow fiber membrane is used for the filtration device.
Shows an example in which six are arranged in parallel.
【００１３】図１において、１は原液タンクであり、濾
過されるべき原液１ａが貯蔵されている。本実施形態で
は、原液１ａとして、例えば、河川水、湖沼水、地下水
或いは海水等が使用される。原液タンク１の下流側に
は、各系統に夫々原液循環ポンプ２が接続されており、
該原液循環ポンプ２を駆動することにより原液タンク１
内の原液１ａを配管３に供給する。In FIG. 1, reference numeral 1 denotes a stock solution tank which stores a stock solution 1a to be filtered. In the present embodiment, for example, river water, lake water, groundwater, seawater, or the like is used as the stock solution 1a. A stock solution circulating pump 2 is connected to each system on the downstream side of the stock solution tank 1.
By driving the stock solution circulation pump 2, the stock solution tank 1
The stock solution 1 a is supplied to the pipe 3.
【００１４】前記配管３にはクロスフロー方式の中空糸
状膜で構成される濾過膜モジュール４が６個並列に接続
されており、配管３を通って濾過膜モジュール４に供給
された原液１ａは、原液循環ポンプ２の作用により所定
の圧力が付与されて濾過膜モジュール４の中空糸状膜の
外側から内側に透過することで濾過され、濾過膜モジュ
ール４により濾過された濾過液１ｂが中空糸状膜の内側
を流通して濾過液配管５に導かれて濾過液タンク６に貯
蔵される。Six filtration membrane modules 4 each composed of a cross-flow type hollow fiber membrane are connected in parallel to the pipe 3, and the stock solution 1a supplied to the filtration membrane module 4 through the pipe 3 is A predetermined pressure is applied by the action of the undiluted solution circulation pump 2, and the filtrate is filtered by permeating from the outside to the inside of the hollow fiber membrane of the filtration membrane module 4, and the filtrate 1b filtered by the filtration membrane module 4 is removed from the hollow fiber membrane. After flowing through the inside, it is guided to the filtrate pipe 5 and stored in the filtrate tank 6.
【００１５】一方、配管３を通って濾過膜モジュール４
に供給された原液１ａの一部は、循環戻り原液１ｃとし
て濾過膜モジュール４の中空糸状膜の外側を流通して原
液戻り配管７に導かれて原液タンク１に戻るようになっ
ている。On the other hand, the filtration membrane module 4
A part of the stock solution 1a supplied to the tank flows through the outside of the hollow fiber membrane of the filtration membrane module 4 as the circulating stock solution 1c, is guided to the stock solution return pipe 7, and returns to the stock solution tank 1.
【００１６】また、濾過膜モジュール４の濾過膜に蓄積
した懸濁物質を排除する目的で、逆洗装置が設けられて
おり、濾過液タンク６に一旦貯蔵された濾過液１ｂが逆
洗回収ポンプ８ａ，８ｂを運転することにより逆洗配管
９を流通して濾過液配管５に導かれ、濾過膜モジュール
４の中空糸状膜の内側を濾過液１ｂが逆流すると共に、
逆洗回収ポンプ８ａ，８ｂにより所定の圧力が付与され
て濾過液１ｂが濾過膜モジュール４の中空糸状膜の内側
から外側に透過することで濾過膜モジュール４の中空糸
状膜の外側表面に蓄積した懸濁物質を剥離する。A backwashing device is provided for the purpose of removing suspended substances accumulated in the filtration membrane of the filtration membrane module 4, and the filtrate 1 b once stored in the filtrate tank 6 is subjected to a backwash recovery pump. By driving the backwash pipe 9 by operating the 8a and 8b, the filtrate 1b is guided to the filtrate pipe 5, and the filtrate 1b flows back inside the hollow fiber membrane of the filtration membrane module 4, and
A predetermined pressure is applied by the backwash recovery pumps 8a and 8b, and the filtrate 1b permeates from the inside to the outside of the hollow fiber membrane of the filtration membrane module 4, and accumulates on the outer surface of the hollow fiber membrane of the filtration membrane module 4. Peel off the suspended material.
【００１７】上記逆洗運転は、例えば、６０分に１回の
割合で６０秒間行なって周期的に繰り返す。The backwashing operation is performed, for example, once every 60 minutes for 60 seconds, and is repeated periodically.
【００１８】また、同様に濾過膜モジュール４の濾過膜
に蓄積した懸濁物質を排除する目的で、エアバブリング
装置が設けられており、コンプレッサ10により供給され
た圧縮空気が空気槽11を介して配管12に導かれ、濾過膜
モジュール４の上流側から供給されて該濾過膜モジュー
ル４の中空糸状膜の外側を流通して該中空糸状膜を振動
させ、中空糸状膜の外側表面に蓄積した懸濁物質を剥離
する。Similarly, an air bubbling device is provided for removing suspended substances accumulated in the filtration membrane of the filtration membrane module 4, and compressed air supplied by the compressor 10 is supplied through an air tank 11. The suspension is supplied to the pipe 12 and supplied from the upstream side of the filtration membrane module 4 and circulates outside the hollow fiber membrane of the filtration membrane module 4 to vibrate the hollow fiber membrane and accumulate on the outer surface of the hollow fiber membrane. Peel off suspended substances.
【００１９】上記エアバブリング運転は、例えば、先
ず、濾過膜モジュール４内に原液１ａを張った状態、即
ち、濾過膜モジュール４内で原液１ａが静止して滞留し
た状態で６０秒間、空気または窒素ガスを供給した後、
更に濾過膜モジュール４に原液１ａを流した状態で６０
秒間、空気または窒素ガスを供給する。そして、３日に
１回の割合で前述の一連のエアバブリング運転を１２０
秒間行ってこれを周期的に繰り返す。In the air bubbling operation, for example, first, the stock solution 1a is stretched in the filtration membrane module 4, that is, the stock solution 1a is stationary and stays in the filtration membrane module 4 for 60 seconds with air or nitrogen. After supplying gas,
Further, with the undiluted solution 1a flowing through the filtration membrane module 4, 60
Supply air or nitrogen gas for seconds. The above-described series of air bubbling operations is performed once every three days for 120 days.
This is repeated for a second and periodically.
【００２０】そして、原液タンク１から原液循環ポンプ
２により供給された原液１ａの一部である循環戻り原液
１ｃが濾過膜モジュール４の中空糸状膜の外側を流通し
て、上述のようにして剥離した懸濁物質を押し流して排
液し、剥離した懸濁物質を含む循環戻り原液１ｃは原液
戻り配管７に導かれて原液タンク１に戻る。Then, the recirculated undiluted solution 1c, which is a part of the undiluted solution 1a supplied from the undiluted solution tank 1 by the undiluted solution circulating pump 2, flows outside the hollow fiber membrane of the filtration membrane module 4 and is stripped as described above. The suspended suspended material is flushed and drained, and the circulating return stock solution 1c containing the separated suspended material is guided to the stock solution return pipe 7 and returns to the stock solution tank 1.
【００２１】上述の逆洗運転やエアバブリング運転で
は、通常の濾過処理運転を一旦停止させることとなり、
この運転中に、濾過膜モジュール４及び各配管内の原液
１ａ（及び濾過液１ｂ）が抜け出して比較的軽負荷とな
る。そして、従来では、逆洗運転やエアバブリング運転
の終了後に停止状態から濾過処理開始への切り換え時
に、原液循環ポンプ２により濾過膜モジュール４へ供給
される原液１ａの入力圧力が急激に増大して濾過膜モジ
ュール４の濾過膜に大きな圧力がかかるため、濾過膜モ
ジュール４の濾過膜の耐圧を比較的大きく構成する必要
があった。In the above-described backwashing operation and air bubbling operation, the ordinary filtration operation is temporarily stopped.
During this operation, the undiluted solution 1a (and the filtrate 1b) in the filtration membrane module 4 and each pipe escapes, and the load becomes relatively light. In the related art, when switching from the stopped state to the start of the filtration process after the backwash operation or the air bubbling operation is completed, the input pressure of the stock solution 1a supplied to the filtration membrane module 4 by the stock solution circulation pump 2 sharply increases. Since a large pressure is applied to the filtration membrane of the filtration membrane module 4, it is necessary to make the pressure resistance of the filtration membrane of the filtration membrane module 4 relatively large.
【００２２】そこで、以下に示す実施形態では、通常の
濾過処理時には、濾過液を定流量運転すると共に、逆
洗、エアバブリングまたは停止状態から通常の濾過処理
開始への切り換え時に濾過膜モジュール４への原液１ａ
の入力圧力を所定時間低圧運転するように自動的に変更
するように構成したことで、濾過処理運転開始時や通常
運転時に流量や圧力の大幅な変動がなく、濾過膜モジュ
ール４の濾過膜に衝撃を与えることがない安定した運転
が出来るように構成している。Therefore, in the embodiment described below, during a normal filtration process, the filtrate is operated at a constant flow rate, and at the time of switching from a backwashing, air bubbling or stop state to a normal filtration process start, the filtration membrane module 4 is operated. Stock solution 1a
The input pressure of the filter is automatically changed so as to perform the low pressure operation for a predetermined time, so that the flow rate and the pressure do not significantly change at the start of the filtration process or at the time of the normal operation. The system is designed to enable stable operation without impact.
【００２３】前記低圧運転とは、濾過膜モジュール４へ
の原液１ａの入力圧力を通常運転時よりも低い圧力で運
転するものであり、これは、通常運転圧力によっても変
わるが、濾過膜へのショックを少なくするために１kg/c
m2以下の圧力で運転することが好ましい。The low-pressure operation refers to an operation in which the input pressure of the undiluted solution 1a to the filtration membrane module 4 is operated at a pressure lower than that in the normal operation, which varies depending on the normal operation pressure. 1kg / c to reduce shock
It is preferred to operate at m 2 or less pressure.
【００２４】図２及び図３に示すように、原液循環ポン
プ２の下流側で、且つ濾過膜モジュール４の上流側に
は、濾過膜モジュール４への原液１ａの入力圧力を検知
する圧力センサ13が設けられており、濾過液流路となる
濾過液配管５には、流量センサ14が設けられている。As shown in FIGS. 2 and 3, a pressure sensor 13 for detecting the input pressure of the stock solution 1a to the filtration membrane module 4 is provided downstream of the stock solution circulation pump 2 and upstream of the filtration membrane module 4. Is provided, and a flow rate sensor 14 is provided in the filtrate pipe 5 serving as a filtrate flow path.
【００２５】そして、前記圧力センサ13及び前記流量セ
ンサ14に接続され、該圧力センサ13の検知情報及び前記
流量センサ14の検知情報に選択的に対応して原液循環ポ
ンプ２の出力を制御するモータ２ａを制御するインバー
タ15が設けられている。A motor connected to the pressure sensor 13 and the flow sensor 14 for controlling the output of the stock solution circulating pump 2 selectively in response to the detection information of the pressure sensor 13 and the detection information of the flow sensor 14 An inverter 15 for controlling 2a is provided.
【００２６】図２は、濾過装置の通常運転時において、
濾過液１ｂを定流量運転する場合の構成を示し、インバ
ータ15は濾過液配管５に設けられた流量センサ14の検知
情報に基づいてモータ２ａを制御し、原液循環ポンプ２
の出力を制御して濾過液１ｂを定流量運転するようにな
っている。FIG. 2 shows that during normal operation of the filtration device,
The inverter 15 controls the motor 2a based on the detection information of the flow rate sensor 14 provided in the filtrate pipe 5, and performs a constant flow operation of the filtrate 1b.
Is controlled to operate the filtrate 1b at a constant flow rate.
【００２７】即ち、濾過液配管５を流通する濾過液１ｂ
の流量を流量センサ14により検知し、該流量センサ14の
出力信号に応じてインバータ15がモータ２ａに印加する
入力周波数を制御して該モータ２ａの回転数を制御し、
原液循環ポンプ２の出力を制御するように構成される。That is, the filtrate 1b flowing through the filtrate pipe 5
Is detected by the flow rate sensor 14, and the inverter 15 controls the input frequency applied to the motor 2a in accordance with the output signal of the flow rate sensor 14 to control the rotation speed of the motor 2a.
It is configured to control the output of the stock solution circulating pump 2.
【００２８】そして、例えば、濾過液配管５を流通する
濾過液１ｂの流量が減少すると、流量センサ14の検知信
号に基づいてインバータ15の周波数を増加させてモータ
２ａの回転数を所定量増加させ、原液循環ポンプ２の出
力を増加させる。そして、原液循環ポンプ２の出力が増
加すると、濾過膜モジュール４の濾過膜に印加される濾
過圧力が増加して濾過膜モジュール４を通過する濾過液
１ｂの流量が増加する。For example, when the flow rate of the filtrate 1b flowing through the filtrate pipe 5 decreases, the frequency of the inverter 15 is increased based on the detection signal of the flow rate sensor 14 to increase the rotation speed of the motor 2a by a predetermined amount. , The output of the stock solution circulation pump 2 is increased. When the output of the stock solution circulation pump 2 increases, the filtration pressure applied to the filtration membrane of the filtration membrane module 4 increases, and the flow rate of the filtrate 1b passing through the filtration membrane module 4 increases.
【００２９】また、逆に、濾過液配管５を流通する濾過
液１ｂの流量が増加すると、流量センサ14の検知信号に
基づいてインバータ15の周波数を低下させてモータ２ａ
の回転数を所定量減少させ、原液循環ポンプ２の出力を
減少させる。そして、原液循環ポンプ２の出力が減少す
ると、濾過膜モジュール４の濾過膜に印加される濾過圧
力が減少して濾過膜モジュール４を通過する濾過液１ｂ
の流量が減少する。Conversely, when the flow rate of the filtrate 1b flowing through the filtrate pipe 5 increases, the frequency of the inverter 15 decreases based on the detection signal of the flow rate sensor 14 and the motor 2a
Is reduced by a predetermined amount, and the output of the stock solution circulating pump 2 is reduced. When the output of the stock solution circulation pump 2 decreases, the filtration pressure applied to the filtration membrane of the filtration membrane module 4 decreases, and the filtrate 1b passing through the filtration membrane module 4
Flow rate is reduced.
【００３０】従って、流量センサ14の検知情報によりイ
ンバータ15が作動する値を予め設定しておき、濾過液配
管５を流通する濾過液１ｂの流量が一定になるようにイ
ンバータ15を作動させてモータ２ａを制御し、これによ
り原液循環ポンプ２を制御することで濾過液配管５を流
通する濾過液１ｂの流量を一定にすることが出来る。Therefore, a value at which the inverter 15 is operated is set in advance based on the detection information of the flow rate sensor 14, and the inverter 15 is operated so that the flow rate of the filtrate 1b flowing through the filtrate pipe 5 is constant. By controlling 2a and thereby controlling the undiluted solution circulating pump 2, the flow rate of the filtrate 1b flowing through the filtrate pipe 5 can be made constant.
【００３１】図３は、濾過装置において、濾過膜モジュ
ール４の濾過膜に蓄積した懸濁物質を排除する逆洗、エ
アバブリングまたは停止状態からの濾過処理開始への切
り換え時に濾過膜モジュール４への原液１ａの入力圧力
を所定時間低圧運転する構成を示し、インバータ15は原
液循環ポンプ２の下流側で、且つ濾過膜モジュール４の
上流側に設けられた圧力センサ13の検知情報に基づいて
モータ２ａを制御し、原液循環ポンプ２の出力を制御し
て濾過膜モジュール４への原液１ａの入力圧力を低圧運
転する。そして、インバータ15の動作をタイマー等でコ
ントロールすることで低圧運転を所定時間行うようにな
っている。FIG. 3 shows that in the filtration device, the filter membrane module 4 is subjected to backwashing, air bubbling, or switching from the stopped state to the start of filtration processing to eliminate suspended substances accumulated in the filtration membrane of the filtration membrane module 4. A configuration in which the input pressure of the undiluted solution 1a is operated at a low pressure for a predetermined time is shown. An inverter 15 operates based on detection information of a pressure sensor 13 provided on the downstream side of the undiluted solution circulating pump 2 and on the upstream side of the filtration membrane module 4. And the output of the stock solution circulating pump 2 is controlled so that the input pressure of the stock solution 1a to the filtration membrane module 4 is reduced. The low-pressure operation is performed for a predetermined time by controlling the operation of the inverter 15 with a timer or the like.
【００３２】即ち、通常の濾過処理運転を一旦停止させ
て、逆洗運転やエアバブリング運転を実施することで、
これ等の運転中に、濾過膜モジュール４及び各配管内の
原液１ａ（及び濾過液１ｂ）が抜け出して比較的軽負荷
となり、圧力センサ13により検知される濾過膜モジュー
ル４の上流側の圧力は減少する。That is, by temporarily stopping the ordinary filtration operation and performing the backwash operation or the air bubbling operation,
During these operations, the undiluted solution 1a (and the filtrate 1b) in the filtration membrane module 4 and each pipe escapes and becomes a relatively light load, and the pressure on the upstream side of the filtration membrane module 4 detected by the pressure sensor 13 is reduced. Decrease.
【００３３】そして、逆洗、エアバブリングまたは停止
状態からの濾過処理開始への切り換え時に、圧力センサ
13により検知された検知情報に基づいてインバータ15の
周波数を低下させてモータ２ａの回転数を所定量減少さ
せ、原液循環ポンプ２の出力を減少させる。そして、原
液循環ポンプ２の出力が減少すると、濾過膜モジュール
４の濾過膜に印加される濾過圧力が減少して、原液１ａ
が低圧で濾過膜モジュール４に供給される。At the time of switching from backwashing, air bubbling or the stop state to the start of filtration processing, the pressure sensor
The frequency of the inverter 15 is reduced based on the detection information detected by the controller 13 to reduce the rotation speed of the motor 2a by a predetermined amount, thereby reducing the output of the stock solution circulating pump 2. When the output of the stock solution circulation pump 2 decreases, the filtration pressure applied to the filtration membrane of the filtration membrane module 4 decreases, and the stock solution 1a
Is supplied to the filtration membrane module 4 at a low pressure.
【００３４】上記のように、逆洗、エアバブリングまた
は停止状態から通常の濾過処理開始への切り換え時に濾
過膜モジュール４への原液１ａの入力圧力を所定時間定
圧運転することで、原液循環ポンプ２から供給される原
液１ａが濾過膜モジュール４に入力される圧力が低圧と
なり、濾過膜モジュール４の濾過膜に衝撃等を与えるこ
となく、濾過膜モジュール４の濾過膜の保全が維持でき
ると共に、原液循環ポンプ２が安定に運転できる。As described above, the input pressure of the stock solution 1a to the filtration membrane module 4 is operated at a constant pressure for a predetermined time at the time of switching from the backwashing, air bubbling or stoppage to the normal start of the filtration process. The pressure at which the stock solution 1a supplied from the filter membrane is input to the filtration membrane module 4 becomes low, and the integrity of the filtration membrane of the filtration membrane module 4 can be maintained without giving an impact to the filtration membrane of the filtration membrane module 4, and the stock solution can be maintained. The circulation pump 2 can operate stably.
【００３５】従って、従来例のように、逆洗運転やエア
バブリング運転の終了後に停止状態から濾過処理開始へ
の切り換え時に、原液循環ポンプ２により濾過膜モジュ
ール４へ供給される原液１ａの入力圧力が増大し、濾過
膜モジュール４の濾過膜に大きな圧力がかかり、該濾過
膜に多大な負担をかけることがない。Accordingly, as in the conventional example, when the backwashing operation or the air bubbling operation is completed and the stop state is switched to the filtration processing start, the input pressure of the stock solution 1a supplied to the filtration membrane module 4 by the stock solution circulation pump 2 is changed. Is increased, and a large pressure is applied to the filtration membrane of the filtration membrane module 4 without imposing a great burden on the filtration membrane.
【００３６】低圧運転が所定時間経過し、濾過液１ｂの
流量が安定した時点で、インバータ15に伝達される検知
情報が、圧力センサ13からの検知情報から流量センサ14
からの検知情報に自動的に変更されるようになってお
り、これによって、前述したように、濾過液１ｂを定流
量運転する通常の濾過処理運転に移行するようになって
いる。When the low-pressure operation has passed for a predetermined time and the flow rate of the filtrate 1b has stabilized, the detection information transmitted to the inverter 15 is based on the detection information from the pressure sensor 13 based on the detection information from the pressure sensor 13.
The detection information is automatically changed to the detection information from, and as described above, the operation shifts to the normal filtration operation in which the filtrate 1b is operated at a constant flow rate.
【００３７】以上の構成により、通常の濾過処理状態で
は流量センサ14の検知情報に基づいてインバータ15が原
液循環ポンプ２の出力を制御して定流量運転し、濾過膜
モジュール４の濾過膜に蓄積した懸濁物質を排除する逆
洗、エアバブリングまたは停止状態からの濾過処理開始
への切り換え時には、圧力センサ13の検知情報に基づい
てインバータ15が原液循環ポンプ２の出力を制御して濾
過膜モジュール４への原液１ａの入力圧力を所定時間低
圧運転することが出来るものである。With the above configuration, in a normal filtration processing state, the inverter 15 controls the output of the stock solution circulating pump 2 based on the detection information of the flow sensor 14 to operate at a constant flow rate, and accumulates in the filtration membrane of the filtration membrane module 4. At the time of switching from the backwashing, air bubbling, or the stop state to the start of the filtration process for removing the suspended substance, the inverter 15 controls the output of the stock solution circulating pump 2 based on the detection information of the pressure sensor 13 to filter the filtration membrane module. 4, the input pressure of the stock solution 1a can be operated at a low pressure for a predetermined time.
【００３８】尚、図中の16は温度センサ、17は流量セン
サ、18は流量弁である。前記実施形態における通常の濾
過処理運転中の流量及び圧力の制御の一例として、原液
循環ポンプ２の下流側で濾過膜モジュール４の上流側の
原液１ａの流量が２．５ｍ3/hr、圧力が２．０kg/cm2で
あり、濾過膜モジュール４の下流側の濾過液１ｂの流量
が２．０ｍ3/hrの定流量で、圧力が０．１kg/cm2であ
り、濾過膜モジュール４の下流側の循環戻り原液１ｃの
流量が０．５ｍ3/hrの定流量で、圧力が１．７kg/cm2等
の数値で制御される。尚、ここで使用される濾過膜モジ
ュール４の濾過膜の耐圧は３kg/cm2に設定されている。In the drawing, reference numeral 16 denotes a temperature sensor, 17 denotes a flow sensor, and 18 denotes a flow valve. As an example of the control of the flow rate and the pressure during the normal filtration operation in the embodiment, the flow rate of the stock solution 1a downstream of the stock solution circulation pump 2 and the upstream side of the filtration membrane module 4 is 2.5 m 3 / hr, and the pressure is 2.5 m 3 / hr. 2.0 kg / cm 2 , the flow rate of the filtrate 1b downstream of the filtration membrane module 4 is a constant flow rate of 2.0 m 3 / hr, the pressure is 0.1 kg / cm 2 , The flow rate of the circulation return stock solution 1c on the downstream side is controlled at a constant flow rate of 0.5 m 3 / hr, and the pressure is controlled at a numerical value such as 1.7 kg / cm 2 . The pressure resistance of the filtration membrane of the filtration membrane module 4 used here is set to 3 kg / cm 2 .
【００３９】濾過膜モジュール４の濾過膜に蓄積した懸
濁物質を排除する逆洗、エアバブリングまたは停止状態
からの濾過処理開始への切り換え時には、原液循環ポン
プ２により供給される原液１ａが濾過膜モジュール４の
上流側に入力される圧力が好ましくは１．０kg/cm2以下
の範囲内で所定時間低圧運転され、所定時間が経過後
は、通常の濾過処理運転の圧力が２．０kg/cm2に復帰す
る。At the time of back washing, air bubbling, or switching from the stopped state to the start of filtration processing, the stock solution 1a supplied by the stock solution circulating pump 2 is used to remove the suspended matter accumulated in the filtration membrane of the filtration membrane module 4. The pressure input to the upstream side of the module 4 is preferably low-pressure operation for a predetermined time within a range of 1.0 kg / cm 2 or less, and after a predetermined time elapses, the pressure of the normal filtration operation becomes 2.0 kg / cm 2. Return to 2 .
【００４０】[0040]
【発明の効果】本発明は、上述の如き構成と作用とを有
するので、濾過処理時には、定流量運転すると共に、逆
洗、エアバブリングまたは停止状態から通常の濾過処理
開始への切り換え時に濾過膜への原液の入力圧力を所定
時間低圧運転するように自動的に変更されるようにする
ことで、逆洗、エアバブリングまたは停止状態から通常
の濾過処理状態への移行が安定して行える。よって、濾
過膜入口圧力のオーバーシュートもなくなり、濾過膜に
過大な圧力がかかることがなくなり、濾過膜に衝撃等を
与えることがなく、濾過膜の保全を確保することが出来
る。Since the present invention has the above-described structure and operation, the filter is operated at a constant flow rate during the filtration process, and when the filter is switched from the backwashing, air bubbling or stop state to the normal start of the filtration process, the filtration membrane is operated. By automatically changing the input pressure of the undiluted solution to the low-pressure operation for a predetermined time, it is possible to stably shift from the backwashing, the air bubbling or the stop state to the normal filtration processing state. Therefore, there is no overshoot of the pressure at the inlet of the filtration membrane, and no excessive pressure is applied to the filtration membrane, and no impact or the like is applied to the filtration membrane, so that the maintenance of the filtration membrane can be secured.
【００４１】また、低圧運転から定流量運転に切り換え
ることで、濾過膜内に液が満たされていない状態であっ
ても、濾過膜入口の圧力の大きな変動を生じることがな
いため、流量や圧力の大幅な変動がなく、安定した運転
が出来る。By switching from the low pressure operation to the constant flow operation, the pressure at the inlet of the filtration membrane does not fluctuate greatly even when the liquid is not filled in the filtration membrane. Stable operation is possible without significant fluctuation of
【図１】本発明に係る濾過装置を適用した濾過システム
の一例を示す全体図である。FIG. 1 is an overall view showing an example of a filtration system to which a filtration device according to the present invention is applied.
【図２】本発明に係る濾過装置の通常運転時において、
濾過液を定流量運転する構成を示す模式図である。FIG. 2 shows a state during normal operation of the filtration device according to the present invention.
It is a schematic diagram which shows the structure which performs a constant flow operation of a filtrate.
【図３】本発明に係る濾過装置において、濾過膜に蓄積
した懸濁物質を排除する逆洗、エアバブリングまたは停
止状態からの濾過処理開始への切り換え時に濾過膜への
原液の入力圧力を所定時間低圧運転する構成を示す模式
図である。FIG. 3 is a diagram showing a state in which the input pressure of the undiluted solution to the filtration membrane is set to a predetermined value at the time of backwashing, air bubbling, or switching from the stop state to the start of filtration processing in the filtration apparatus according to the present invention for eliminating suspended substances accumulated in the filtration membrane It is a schematic diagram which shows the structure which performs low pressure operation for a time.
１…原液タンク １ａ…原液 １ｂ…濾過液 １ｃ…循環戻り原液 ２…原液循環ポンプ ２ａ…モータ ３…配管 ４…濾過膜モジュール ５…濾過液配管 ６…濾過液タンク ７…原液戻り配管 ８ａ，８ｂ…逆洗回収ポンプ ９…逆洗配管 10…コンプレッサ 11…空気槽 12…配管 13…圧力センサ 14…流量センサ 15…インバータ 16…温度センサ 17…流量センサ 18…流量弁 DESCRIPTION OF SYMBOLS 1 ... Undiluted solution tank 1a ... Undiluted solution 1b ... Filtrate 1c ... Circulated return undiluted solution 2 ... Undiluted solution circulation pump 2a ... Motor 3 ... Piping 4 ... Filtration membrane module 5 ... Filtrate piping 6 ... Filtrate tank 7 ... Undiluted solution return piping 8a, 8b ... Backwash recovery pump 9 ... Backwash pipe 10 ... Compressor 11 ... Air tank 12 ... Pipe 13 ... Pressure sensor 14 ... Flow sensor 15 ... Inverter 16 ... Temperature sensor 17 ... Flow sensor 18 ... Flow valve
Claims (4)
ロー型の精密濾過または限外濾過処理方法において、濾
過膜に蓄積した懸濁物質を排除する逆洗、エアバブリン
グまたは停止状態からの濾過処理開始への切り換え時に
濾過膜への原液の入力圧力を所定時間低圧運転するよう
に構成したことを特徴とする濾過処理方法。1. In a cross-flow type microfiltration or ultrafiltration treatment method in which filtration is performed while circulating a stock solution, backwashing, air bubbling, or filtration from a stopped state is performed to remove suspended substances accumulated in a filtration membrane. A filtering method, wherein the input pressure of the stock solution to the filtration membrane is operated at a low pressure for a predetermined time at the time of switching to the start.
ロー型の精密濾過または限外濾過装置において、濾過膜
の上流側に該濾過膜への原液の入力圧力を検知する圧力
センサを設け、該圧力センサの検知情報に対応して原液
循環ポンプの出力を制御するインバータを有することを
特徴とする濾過装置。2. In a cross-flow type microfiltration or ultrafiltration apparatus for performing filtration while circulating a stock solution, a pressure sensor for detecting an input pressure of the stock solution to the filtration membrane is provided upstream of the filtration membrane, A filtering device comprising an inverter for controlling an output of a stock solution circulation pump in accordance with detection information of a pressure sensor.
ロー型の精密濾過または限外濾過装置において、濾過液
流路に該濾過液流路を流通する濾過液の流量を検知する
流量センサを設けると共に、濾過膜の上流側に該濾過膜
への原液の入力圧力を検知する圧力センサを設け、前記
流量センサの検知情報及び前記圧力センサの検知情報に
選択的に対応して原液循環ポンプの出力を制御するイン
バータを有し、通常の濾過処理状態では前記流量センサ
の検知情報に基づいてインバータが原液循環ポンプの出
力を制御して濾過液を定流量運転し、濾過膜に蓄積した
懸濁物質を排除する逆洗、エアバブリングまたは停止状
態からの濾過処理開始への切り換え時に前記圧力センサ
の検知情報に基づいてインバータが原液循環ポンプの出
力を制御して濾過膜への原液の入力圧力を所定時間低圧
運転するように構成したことを特徴とする濾過装置。3. A cross-flow type microfiltration or ultrafiltration apparatus for performing filtration while circulating a stock solution, wherein a flow rate sensor for detecting a flow rate of the filtrate flowing through the filtrate flow path is provided in the filtrate flow path. A pressure sensor for detecting the input pressure of the undiluted solution to the filtration membrane is provided upstream of the filtration membrane, and the output of the undiluted liquid circulating pump selectively corresponds to the detection information of the flow rate sensor and the detection information of the pressure sensor. In the normal filtration state, the inverter controls the output of the stock solution circulation pump based on the detection information of the flow sensor to operate the filtrate at a constant flow rate, and the suspended solids accumulated on the filtration membrane. The inverter controls the output of the stock solution circulating pump based on the detection information of the pressure sensor at the time of switching from the backwashing, air bubbling or the stop state to the start of the filtration process to eliminate the filtration membrane. A filter configured to operate the input pressure of the undiluted solution at a low pressure for a predetermined time.
記原液循環ポンプの回転数を変化させるように構成した
ことを特徴とする請求項２または請求項３に記載の濾過
装置。4. The filtering device according to claim 2, wherein a frequency of the inverter is changed to change a rotation speed of the stock solution circulating pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19876596A JP3579188B2 (en) | 1996-07-29 | 1996-07-29 | Filtration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19876596A JP3579188B2 (en) | 1996-07-29 | 1996-07-29 | Filtration device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1033957A true JPH1033957A (en) | 1998-02-10 |
| JP3579188B2 JP3579188B2 (en) | 2004-10-20 |
Family
ID=16396574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19876596A Expired - Fee Related JP3579188B2 (en) | 1996-07-29 | 1996-07-29 | Filtration device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3579188B2 (en) |
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| JP2017522169A (en) * | 2014-05-13 | 2017-08-10 | アムジエン・インコーポレーテツド | Process control system and method for use in filters and filtration processes |
| JP2017525563A (en) * | 2014-08-12 | 2017-09-07 | ウォーター プラネット，インコーポレイテッド | Intelligent fluid filtration management system |
| CN107617337A (en) * | 2016-07-14 | 2018-01-23 | 宁波乐惠国际工程装备股份有限公司 | A kind of cross-flow filtration control method, cross-flow filtration device and cross-flow filtration system |
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-
1996
- 1996-07-29 JP JP19876596A patent/JP3579188B2/en not_active Expired - Fee Related
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| JP2017522169A (en) * | 2014-05-13 | 2017-08-10 | アムジエン・インコーポレーテツド | Process control system and method for use in filters and filtration processes |
| US10583397B2 (en) | 2014-05-13 | 2020-03-10 | Amgen Inc. | Process control systems and methods for use with filters and filtration processes |
| JP2020099902A (en) * | 2014-05-13 | 2020-07-02 | アムジエン・インコーポレーテツド | Filter, and process control system and method for use in filtration process |
| US11077404B2 (en) | 2014-05-13 | 2021-08-03 | Amgen Inc. | Process control systems and methods for use with filters and filtration processes |
| JP2022009551A (en) * | 2014-05-13 | 2022-01-14 | アムジエン・インコーポレーテツド | Process control systems and methods for use with filters and filtration processes |
| US11786866B2 (en) | 2014-05-13 | 2023-10-17 | Amgen Inc. | Process control systems and methods for use with filters and filtration processes |
| JP2017525563A (en) * | 2014-08-12 | 2017-09-07 | ウォーター プラネット，インコーポレイテッド | Intelligent fluid filtration management system |
| CN107617337A (en) * | 2016-07-14 | 2018-01-23 | 宁波乐惠国际工程装备股份有限公司 | A kind of cross-flow filtration control method, cross-flow filtration device and cross-flow filtration system |
| CN109020091A (en) * | 2018-09-12 | 2018-12-18 | 国合环境研究有限公司 | A kind of combined type artificial marsh sewage treatment system and its processing method |
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| Publication number | Publication date |
|---|---|
| JP3579188B2 (en) | 2004-10-20 |
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