JP3644616B2 - Immersion membrane filtration method and apparatus - Google Patents

Immersion membrane filtration method and apparatus Download PDF

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JP3644616B2
JP3644616B2 JP06127797A JP6127797A JP3644616B2 JP 3644616 B2 JP3644616 B2 JP 3644616B2 JP 06127797 A JP06127797 A JP 06127797A JP 6127797 A JP6127797 A JP 6127797A JP 3644616 B2 JP3644616 B2 JP 3644616B2
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membrane
filtration
water
tank
membrane module
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JPH10249339A (en
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建元 黄
幸夫 小林
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Maezawa Industries Inc
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Maezawa Industries Inc
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Description

【０００１】
【発明の属する技術分野】
この発明は、膜モジュールを濾過槽内に浸漬し、膜濾過水吸引ポンプを作動させて濾過槽内の膜に原水を透過させ、原水の濾過を行う浸漬型膜濾過設備において、膜への濾過流量（以下、フラックスという。）を一定にし、効率のよい膜濾過を行うことができる浸漬型膜濾過方法およびその装置に関するものである。
【０００２】
【従来の技術】
水処理設備においては、凝集・沈殿・砂濾過法に代わる新たな浄水処理として原水を濾過膜に流して透過させ、固液分離を行う膜処理技術が注目され、実用化の段階となっている。図２は、従来から用いられている浸漬型膜濾過設備の一例を示す断面図であり、濾過槽１内に膜モジュール５を浸漬してあり、原水ポンプＰ1 により濾過槽１に導入した原水３を、膜濾過水吸引ポンプＰ2 を作動させて膜モジュール５の膜により濾過し、透過した膜濾過水７を処理水槽８に貯留し、浄水用の処理水として供するものである。膜濾過水吸引ポンプ停止後、物理洗浄を行うときは、エアスクラビング用のブロワＢを作動させ、膜モジュール５の下方に設けたエア供給用の散気管９からエアを噴出させて上向流を生起し、膜モジュール５の膜表面に付着したコロイドその他の濁質等を除去する。そして、濃縮された濁質等は、濾過槽１の底部に汚泥（沈殿物）１１として沈降し、電動弁１２を開いて系外に排出される。
【０００３】
【発明が解決しようとする課題】
従来、膜モジュール５にはこれを水平方向に設置してその両側から膜濾過水を吸引する横置きタイプと、膜モジュール５を垂直方向に設置してその上側から膜濾過水を吸引する縦置きタイプとがあるが、例えば横置きタイプの場合、図３の概念図に示すように、原水３を膜モジュール５の膜により濾過し、膜モジュール５の両側から膜濾過水７を吸引するため、膜の中央部より両側の方が吸引力が強く、両側寄りほどフラックスＦが大となる。したがって、初期濃度Ｃ0 にくらべ濃縮された濃度Ｃ1 は両側寄りが大きく、目詰まりを起こす。この傾向は、ブロワ１０を作動させ、散気管９からエアを噴出させて上向流を生起させた場合に特に顕著となる。一方、縦置きタイプの場合は、図４の概念図に示すように、原水３を膜モジュール５の膜により濾過し、膜モジュール５の上側から膜濾過水７を吸引するため、膜の上側の吸引力が強く、下端部寄りほどフラックスＦが小となる。したがって、水槽内の濃度差は上側が薄く、下側が濃くなって、下端部寄りほど目詰まりを起こす。
【０００４】
このように、従来は水槽内に濃度差ができて、膜濾過の効率を悪いものとしていた。この発明は、上記した従来技術における問題点を解決し、膜へのフラックスを一定にし、効率のよい膜濾過を行うことができる浸漬型膜濾過方法およびその装置を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記の目的を達成するための手段として、この発明は、濾過槽の内側にこの濾過槽と離間させて筒状の分離槽を設け、この分離層内に膜モジュールを垂直方向に設置し、前記分離槽内に導入した原水を、膜モジュールの上部から吸引濾過する工程と、膜モジュールの下部から吸引濾過する工程とを、交互に又は同時に行う浸漬型膜濾過方法であって、濾過処理時には、原水供給水量と膜濾過水量とを常時一定にし、原水の水面を膜モジュールの上端部よりも上側で、分離槽の上端部よりもやや下側の位置に保つ一方、エアスクラビング時には、原水供給水量と排泥水量とを調節し、原水の水面を分離槽の上端部の位置に保つことを特徴とする浸漬型膜濾過方法を構成した。
【０００６】
また、この発明は、濾過槽と、この濾過槽内に垂直方向に設置した膜モジュールと、濾過槽に供給した原水を膜モジュールに吸引濾過させるための膜濾過水吸引ポンプと、この膜濾過水吸引ポンプと膜モジュールの上部取出口および下部取出口とを接続する濾過水取出管と、この濾過水取出管に設けられ、膜濾過水吸引ポンプの作動時に、濾過水を上部取出口および下部取出口のいずれから取り出すかを選択する切替え用の電動弁とを備えることを特徴とする浸漬型膜濾過装置を構成した。
【０００７】
【発明の実施の形態】
以下に、この発明の実施の形態を図面について説明する。図１は、この発明に係る浸漬型膜濾過設備における浸漬水濃縮方法を説明するための装置の断面図である。
図１において、濾過槽１には、その内側にこれと離間させて筒状の分離槽１ａを設け、濾過槽１の内側において当該濾過槽１を内と外の二槽に分けている。分離槽１ａ内には浸漬水である原水３が原水ポンプＰ1 により原水導入ラインａより導入される。原水３は、板状体に多数の穴を穿ったいわゆるパンチングメタルと称する整流板２を介して濾過槽１内に濃度が均一となるように流入される。濾過槽１の内部に浸漬した膜モジュール５は、図中に点線で示すように垂直方向に設置され、原水３はその膜により濾過される。膜モジュール５は、ＭＦ膜，ＵＦ膜，ＲＯ膜あるいは適宜のメッシュの網状体からなり、この実施形態では、ポリエチレン製親水化中空糸膜精密濾過膜を用いた。ポリエチレン製に代えて酢酸セルロース製を用いてもよい。
【０００８】
原水３は、膜濾過水吸引ポンプＰ2 に吸引されて膜モジュール５の内部に透過され、内側に透過した濾過水を取り入れるが、この際、膜濾過水吸引ポンプＰ2 と膜モジュール５とを接続する濾過水取出管６は、膜モジュール５の上部取出口５Ａに連結される上部濾過水取出管６Ａと、膜モジュール５の下部取出口５Ｂに連結される下部濾過水取出管６Ｂとに分岐されている。なお、上部濾過水取出管６Ａと下部濾過水取出管６Ｂとは、図面上はシンボル的に２つのラインで示している。そして、上部濾過水取出管６Ａおよび下部濾過水取出管６Ｂのそれぞれの濾過水取出ラインｂ，ｃ上には切替え用の電動弁４Ａおよび４Ｂを設けてある。この電動弁４Ａおよび４Ｂは、膜濾過水吸引ポンプＰ2 の作動時に、濾過水を膜モジュール５の上部取出口５Ａおよび下部取出口５Ｂのいずれから取り出すかを選択し切り替える。したがって、この発明では、切替え用の電動弁４Ａおよび４Ｂを作動させることにより、膜モジュール５の上部から膜濾過水を吸引する工程と、膜モジュール５の下部から膜濾過水を吸引する工程とが、交互に又は同時に行われる。
【０００９】
原水３は、膜濾過水吸引ポンプＰ2 の作動により膜モジュール５の膜により濾過され、膜モジュール５の上部取出口５Ａおよび下部取出口５Ｂのいずれか、または双方から同時に、透過水ラインｄを通って取り出され、膜濾過水７を処理水槽８に貯留し、浄水用の処理水として供される。膜濾過水吸引ポンプＰ2 の停止後、物理洗浄を行うときは、エアスクラビング用のブロワＢを作動させ、膜モジュール５の下方および側方に設けたエア供給用の散気管９Ａおよび９Ｂからエアを噴出させ、膜モジュール５の膜表面に付着したコロイドその他の濁質等を除去する。そして、濃縮された濁質等は、濾過槽１の底部に汚泥（沈殿物）１１として沈降し、電動弁１２を開いて系外に排出される。また、逆洗処理は、処理水槽８内の浄水用の処理水を逆洗ポンプＰ3 により逆洗水ラインｅを経由して透過水ラインｄより逆流させ、膜モジュール５の内側から外側に向けて噴出させて、逆洗水による膜の物理洗浄を行うものである。
【００１０】
濾過処理時、原水３は原水ポンプＰ1により導入され、膜濾過水吸引ポンプＰ2に吸引されて膜モジュール５の膜により濾過される。このとき、原水供給水量と膜濾過水量とを常時一定にし、原水３の水面を膜モジュール５の上端部よりも上側で、分離槽１ａの上端部よりもやや下側の位置（符号ｇの位置）に保つ。
【００１１】
エアスクラビング時には、膜濾過水吸引ポンプＰ2を停止し、散気管９Ａおよび９Ｂに送給されたエアが気泡となって、原水３を濃縮する。このとき、原水３の供給量と電動弁１２の開閉による排泥水量とを調節し、浸漬水の水面を分離槽１ａの上端部つまりオーバーフローの位置（符号ｆの位置）とする。オーバーフローにより濃縮された水および汚泥は濾過槽１と分離槽１ａの間に流れ込み、濾過槽１の下層において浸漬水と汚泥とが分離される。分離された汚泥１１は排水管１ｂより排出される。
【００１２】
【発明の効果】
この発明によれば、濾過槽の内側にこの濾過槽と離間させて筒状の分離槽を設け、この分離層内に膜モジュールを垂直方向に設置し、前記分離槽内に導入した原水を、膜モジュールの上部から吸引濾過する工程と、膜モジュールの下部から吸引濾過する工程とを、交互に又は同時に行う浸漬型膜濾過方法であって、濾過処理時には、原水供給水量と膜濾過水量とを常時一定にし、原水の水面を膜モジュールの上端部よりも上側で、分離槽の上端部よりもやや下側の位置に保つ一方、エアスクラビング時には、原水供給水量と排泥水量とを調節し、原水の水面を分離槽の上端部の位置に保つ浸漬型膜濾過方法を構成し、また、濾過槽と、この濾過槽内に垂直方向に設置した膜モジュールと、濾過槽に供給した原水を膜モジュールに吸引濾過させるための膜濾過水吸引ポンプと、この膜濾過水吸引ポンプと膜モジュールの上部取出口および下部取出口とを接続する濾過水取出管と、この濾過水取出管に設けられ、膜濾過水吸引ポンプの作動時に、濾過水を上部取出口および下部取出口のいずれから取り出すかを選択する切替え用の電動弁とを備える浸漬型膜濾過装置を構成した。したがって、従来の膜モジュールの上側からのみ膜濾過水を吸引する手段と比較して、膜へのフラックスを一定にし、効率のよい膜濾過を行うことができる効果がある。
【図面の簡単な説明】
【図１】この発明に係る浸漬型膜濾過方法およびその装置を説明するための装置の断面図である。
【図２】従来から用いられている浸漬型膜濾過設備の一例を示す断面図である。
【図３】従来の膜モジュールを水平方向に設置する横置きタイプの浸漬型膜濾過設備のフラックスの傾向を示す概念図である。
【図４】従来の膜モジュールを垂直方向に設置する縦置きタイプの浸漬型膜濾過設備のフラックスの傾向を示す概念図である。
【符号の説明】
１ …濾過槽
１ａ…分離槽
２ …整流板
３ …原水
４Ａ…電動弁
４Ｂ…電動弁
５ …膜モジュール
５Ａ…上部取出口
５Ｂ…下部取出口
６ …濾過水取出管
６Ａ…上部濾過水取出管
６Ｂ…下部濾過水取出管
７ …膜濾過水
８ …処理水槽
９ …散気管
１１ …汚泥
１２ …電動弁
Ｂ …ブロワ
Ｐ1 …原水ポンプ
Ｐ2 …膜濾過水吸引ポンプ
Ｐ3 …逆洗ポンプ
ａ …原水導入ライン
ｂ …濾過水取出ライン
ｃ …濾過水取出ライン
ｄ …透過水ライン
ｅ …逆洗水ライン[0001]
BACKGROUND OF THE INVENTION
This invention is a submerged membrane filtration facility for immersing a membrane module in a filtration tank, operating a membrane filtered water suction pump to permeate the raw water through the membrane in the filtration tank, and filtering the raw water. The present invention relates to a submerged membrane filtration method and apparatus capable of performing efficient membrane filtration with a constant flow rate (hereinafter referred to as flux).
[0002]
[Prior art]
In water treatment facilities, membrane treatment technology that allows raw water to flow through a filtration membrane and permeate it as a new water treatment alternative to agglomeration / precipitation / sand filtration method, and has become a practical stage. . FIG. 2 is a cross-sectional view showing an example of a conventional submerged membrane filtration facility, in which the membrane module 5 is immersed in the filtration tank 1 and the raw water introduced into the filtration tank 1 by the raw water pump P 1. 3, by actuating the membrane filtration water suction pump P 2 is filtered by the membrane of the membrane module 5, and stores the membrane filtration water 7 that has passed through the treating tank 8, is intended to provide a treated water for water purification. When physical cleaning is performed after the membrane filtrate water suction pump is stopped, the air scrubbing blower B is operated, and air is blown out from the air supply diffuser tube 9 provided below the membrane module 5 to cause upward flow. Colloids and other turbidity that occur and adhere to the membrane surface of the membrane module 5 are removed. Then, the concentrated turbidity or the like settles as sludge (precipitate) 11 at the bottom of the filtration tank 1, opens the motor-operated valve 12, and is discharged out of the system.
[0003]
[Problems to be solved by the invention]
Conventionally, the membrane module 5 is installed horizontally in the horizontal direction and the membrane filtrate is sucked from both sides, and the membrane module 5 is installed in the vertical direction and the membrane filtrate is sucked from the upper side. For example, in the case of the horizontal type, as shown in the conceptual diagram of FIG. 3, the raw water 3 is filtered through the membrane of the membrane module 5, and the membrane filtered water 7 is sucked from both sides of the membrane module 5, The suction force is stronger on the both sides than the center of the membrane, and the flux F increases toward the both sides. Therefore, the concentration C 1 concentrated compared to the initial concentration C 0 is larger on both sides, causing clogging. This tendency becomes particularly remarkable when the blower 10 is operated and air is ejected from the diffuser tube 9 to cause upward flow. On the other hand, in the case of the vertical installation type, as shown in the conceptual diagram of FIG. 4, the raw water 3 is filtered through the membrane of the membrane module 5 and the membrane filtered water 7 is sucked from the upper side of the membrane module 5. The suction force is strong, and the flux F becomes smaller toward the lower end. Therefore, the concentration difference in the water tank is thin on the upper side and darker on the lower side, and clogging occurs toward the lower end.
[0004]
As described above, conventionally, there is a difference in concentration in the water tank, and the efficiency of membrane filtration is poor. An object of the present invention is to solve the above-described problems in the prior art, and to provide a submerged membrane filtration method and apparatus capable of performing efficient membrane filtration with a constant flux to the membrane.
[0005]
[Means for Solving the Problems]
As a means for achieving the above object, the present invention provides a cylindrical separation tank spaced from the filtration tank inside the filtration tank, and a membrane module is installed in the vertical direction in the separation layer. A submerged membrane filtration method in which raw water introduced into a separation tank is subjected to suction filtration from the upper part of the membrane module and suction filtration from the lower part of the membrane module alternately or simultaneously. The raw water supply water amount and the membrane filtration water amount are always kept constant, and the raw water surface is kept above the upper end of the membrane module and slightly below the upper end of the separation tank, while at the time of air scrubbing, the raw water supply water amount And the amount of mud water was adjusted, and the submerged membrane filtration method characterized in that the surface of the raw water was kept at the position of the upper end of the separation tank .
[0006]
The present invention also includes a filtration tank, a membrane module installed vertically in the filtration tank, a membrane filtered water suction pump for sucking and filtering raw water supplied to the filtration tank, and the membrane filtered water. A filtered water outlet pipe connecting the suction pump and the upper outlet and lower outlet of the membrane module, and the filtered water outlet pipe is provided in the filtered water outlet pipe. An immersion type membrane filtration device comprising a switching motor-operated valve for selecting from which of the outlets is selected.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an apparatus for explaining an immersion water concentration method in an immersion membrane filtration facility according to the present invention.
In FIG. 1, a filtration tank 1 is provided with a cylindrical separation tank 1 a that is separated from the inside of the filtration tank 1, and the filtration tank 1 is divided into an inner tank and an outer tank inside the filtration tank 1. The inside separation tank 1a is introduced from the raw water inlet line a by the raw water 3 Raw water pump P 1 is a steep water. The raw water 3 flows into the filtration tank 1 so as to have a uniform concentration through a current plate 2 called so-called punching metal having a large number of holes in a plate-like body. The membrane module 5 immersed in the inside of the filtration tank 1 is installed in the vertical direction as shown by a dotted line in the figure, and the raw water 3 is filtered by the membrane. The membrane module 5 is composed of an MF membrane, a UF membrane, an RO membrane, or an appropriate mesh network, and in this embodiment, a polyethylene-made hydrophilic hollow fiber membrane microfiltration membrane was used. Cellulose acetate may be used instead of polyethylene.
[0008]
The raw water 3 is sucked into the membrane filtered water suction pump P 2 and transmitted to the inside of the membrane module 5, and the filtered water that has passed through the inside is taken in. At this time, the membrane filtered water suction pump P 2 and the membrane module 5 are connected. The filtrate drain pipe 6 to be connected branches into an upper filtrate outlet pipe 6A connected to the upper outlet 5A of the membrane module 5 and a lower filtrate outlet pipe 6B connected to the lower outlet 5B of the membrane module 5. Has been. The upper filtered water outlet pipe 6A and the lower filtered water outlet pipe 6B are shown by two lines symbolically on the drawing. Then, motor-operated valves 4A and 4B for switching are provided on the filtered water extraction lines b and c of the upper filtered water outlet pipe 6A and the lower filtered water outlet pipe 6B, respectively. The electric valves 4A and 4B, during the operation of the membrane filtration water suction pump P 2, switches select taken or filtered water from any of the upper outlet 5A and a lower outlet 5B of the membrane module 5. Therefore, in the present invention, the operation of sucking the membrane filtrate from the upper part of the membrane module 5 and the step of sucking the membrane filtrate from the lower part of the membrane module 5 by operating the motorized valves 4A and 4B for switching. , Alternately or simultaneously.
[0009]
Raw water 3 is filtered by the membrane of the membrane module 5 by the operation of the membrane filtration water suction pump P 2, either the top of the membrane module 5 outlet 5A and a lower outlet 5B, or simultaneously from both the permeate line d The membrane filtered water 7 is stored in the treated water tank 8 and used as treated water for water purification. When physical cleaning is performed after the membrane filtered water suction pump P 2 is stopped, the air scrubbing blower B is operated, and air is supplied from the air supply air diffusers 9A and 9B provided below and on the side of the membrane module 5. And colloids and other turbidity adhering to the membrane surface of the membrane module 5 are removed. Then, the concentrated turbidity or the like settles as sludge (precipitate) 11 at the bottom of the filtration tank 1, opens the motor-operated valve 12, and is discharged out of the system. In the backwash process, the treated water in the treated water tank 8 is made to flow back from the permeate line d through the backwash water line e by the backwash pump P 3 and directed from the inside to the outside of the membrane module 5. The membrane is physically washed with backwash water.
[0010]
During the filtration process, the raw water 3 is introduced by the raw water pump P 1, sucked by the membrane filtered water suction pump P 2 and filtered by the membrane of the membrane module 5. At this time, the raw water supply water amount and the membrane filtered water amount are always kept constant, and the water surface of the raw water 3 is located above the upper end portion of the membrane module 5 and slightly below the upper end portion of the separation tank 1a (the position indicated by symbol g ). Keep).
[0011]
During air scrubbing, to stop the membrane filtration water suction pump P 2, air is supplied to the diffuser tube 9A and 9B becomes a bubble, concentrated raw water 3. At this time, the supply amount of the raw water 3 and the amount of discharged mud water by opening and closing the motor-operated valve 12 are adjusted, and the water level of the immersion water is set to the upper end portion of the separation tank 1a, that is, the overflow position (the position indicated by symbol f ). The water and sludge concentrated by the overflow flow between the filtration tank 1 and the separation tank 1a, and the immersion water and the sludge are separated in the lower layer of the filtration tank 1. The separated sludge 11 is discharged from the drain pipe 1b.
[0012]
【The invention's effect】
According to the present invention, a cylindrical separation tank is provided inside the filtration tank so as to be separated from the filtration tank, the membrane module is installed in the vertical direction in the separation layer, and the raw water introduced into the separation tank is A submerged membrane filtration method in which the step of suction filtration from the upper part of the membrane module and the step of suction filtration from the lower part of the membrane module are performed alternately or simultaneously, and at the time of filtration treatment, the raw water supply water amount and the membrane filtration water amount are While always keeping the water level at a position above the upper end of the membrane module and slightly below the upper end of the separation tank, the raw water supply water amount and the amount of mud water are adjusted during air scrubbing. A submerged membrane filtration method that keeps the surface of the raw water at the position of the upper end of the separation tank , a filtration tank, a membrane module installed vertically in the filtration tank, and the raw water supplied to the filtration tank as a membrane Let the module suction filter Membrane filtered water suction pump, a filtered water outlet pipe connecting the membrane filtered water suction pump to the upper outlet and lower outlet of the membrane module, and a membrane filtered water suction pump provided in the filtered water outlet pipe The submerged membrane filtration apparatus comprising a switching motor-operated valve that selects whether the filtered water is taken out from the upper outlet or the lower outlet during the operation. Therefore, compared with the means for sucking the membrane filtrate only from the upper side of the conventional membrane module, there is an effect that the membrane flux can be made constant and efficient membrane filtration can be performed.
[Brief description of the drawings]
FIG. 1 is a sectional view of an apparatus for explaining a submerged membrane filtration method and apparatus according to the present invention.
FIG. 2 is a cross-sectional view showing an example of a conventional immersion membrane filtration facility.
FIG. 3 is a conceptual diagram showing a flux tendency of a horizontal type immersion type membrane filtration facility in which a conventional membrane module is installed in a horizontal direction.
FIG. 4 is a conceptual diagram showing a flux tendency of a vertical type immersion membrane filtration facility in which a conventional membrane module is installed in a vertical direction.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Filtration tank 1a ... Separation tank 2 ... Rectification plate 3 ... Raw water 4A ... Electric valve 4B ... Electric valve 5 ... Membrane module 5A ... Upper outlet 5B ... Lower outlet 6 ... Filtrated water extraction pipe 6A ... Upper filtrate water extraction pipe 6B ... lower filtered water takeout pipe 7 ... membrane filtration water 8 ... treatment water tank 9 ... diffusing pipe 11 ... sludge 12 ... electric valves B ... blower P 1 ... raw water pump P 2 ... membrane filtration water suction pump P 3 ... backwash pump a ... Raw water introduction line b ... Filtration water extraction line c ... Filtration water extraction line d ... Permeate water line e ... Backwash water line

Claims (2)

濾過槽の内側にこの濾過槽と離間させて筒状の分離槽を設け、この分離層内に膜モジュールを垂直方向に設置し、前記分離槽内に導入した原水を、膜モジュールの上部から吸引濾過する工程と、膜モジュールの下部から吸引濾過する工程とを、交互に又は同時に行う浸漬型膜濾過方法であって、濾過処理時には、原水供給水量と膜濾過水量とを常時一定にし、原水の水面を膜モジュールの上端部よりも上側で、分離槽の上端部よりもやや下側の位置に保つ一方、エアスクラビング時には、原水供給水量と排泥水量とを調節し、原水の水面を分離槽の上端部の位置に保つことを特徴とする浸漬型膜濾過方法。 A cylindrical separation tank is provided inside the filtration tank so as to be separated from the filtration tank. A membrane module is installed vertically in the separation layer, and raw water introduced into the separation tank is sucked from the upper part of the membrane module. A submerged membrane filtration method in which the step of filtering and the step of suction filtration from the lower part of the membrane module are performed alternately or simultaneously, and at the time of filtration, the raw water supply water amount and the membrane filtration water amount are always constant, While maintaining the water surface above the upper end of the membrane module and slightly below the upper end of the separation tank, during air scrubbing, the amount of raw water supplied and the amount of mud water are adjusted, and the surface of the raw water is separated from the separation tank. A submerged membrane filtration method characterized by maintaining the position of the upper end of the membrane. 濾過槽と、この濾過槽内に垂直方向に設置した膜モジュールと、濾過槽に供給した原水を膜モジュールに吸引濾過させるための膜濾過水吸引ポンプと、この膜濾過水吸引ポンプと膜モジュールの上部取出口および下部取出口とを接続する濾過水取出管と、この濾過水取出管に設けられ、膜濾過水吸引ポンプの作動時に、濾過水を上部取出口および下部取出口のいずれから取り出すかを選択する切替え用の電動弁とを備えることを特徴とする浸漬型膜濾過装置。A filtration tank, a membrane module installed vertically in the filtration tank, a membrane filtrate suction pump for sucking and filtering the raw water supplied to the filtration tank, and a membrane filtration water suction pump and the membrane module; The filtered water outlet pipe connecting the upper outlet and the lower outlet, and whether the filtered water is taken out from the upper outlet or the lower outlet when the membrane filtrate suction pump is operated. An immersion type membrane filtration device comprising: a motor-operated valve for switching.
JP06127797A 1997-03-14 1997-03-14 Immersion membrane filtration method and apparatus Expired - Fee Related JP3644616B2 (en)

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