JP2006159135A - Hollow fiber membrane module - Google Patents

Hollow fiber membrane module Download PDF

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JP2006159135A
JP2006159135A JP2004356940A JP2004356940A JP2006159135A JP 2006159135 A JP2006159135 A JP 2006159135A JP 2004356940 A JP2004356940 A JP 2004356940A JP 2004356940 A JP2004356940 A JP 2004356940A JP 2006159135 A JP2006159135 A JP 2006159135A
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hollow fiber
fiber membrane
membrane module
module
water
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Norio Matsutani
礼生 松谷
Satoru Tsuda
悟 津田
Satoshi Kasahara
里志 笠原
Toshio Morita
利夫 森田
Shinichi Ohashi
伸一 大橋
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Organo Corp
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Organo Corp
Japan Organo Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a hollow fiber membrane module in which the stuck/fixed ends of hollow fiber membranes can be prevented from being cut or damaged owing to the hydrodynamic stress of a water current and the filtration performance of which can be kept excellent even when a filtration apparatus is made compact or made to have high performance. <P>SOLUTION: This hollow fiber membrane module is constituted so that a hollow fiber membrane bundle formed by sticking/fixing both ends of a plurality of bundled hollow fiber membranes to one another is housed in a cylindrical case and the water, which is to be treated and is introduced through an opening for allowing the inside of the cylindrical case to communicate with the outside, is permeated through each of hollow fiber membranes from the outside surface side to the inside surface side to filter the water to be treated. The opening is arranged so that the end of the opening is parted from the end of the stuck/fixed part of hollow fiber membranes by ≥10 mm. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、中空糸膜モジュールの構造に関し、とくに、中空糸膜モジュールを塔内に懸架して被処理水を濾過処理する濾過装置に用いる場合に好適な中空糸膜モジュールの構造に関する。   TECHNICAL FIELD The present invention relates to a structure of a hollow fiber membrane module, and more particularly to a structure of a hollow fiber membrane module suitable for use in a filtration apparatus that suspends a hollow fiber membrane module in a tower and filters treated water.

中空糸膜フィルタはポリエチレン、ポリスルフォン等のポリマーを多孔体構造で中空糸膜状に形成したものであり、被処理水をポリマーの中空糸膜の外面側から内面側(もしくはこの逆もある)に透過させることにより、被処理水中に含まれる膜孔径以上の微粒子を膜外面側表面で物理的に濾過し被処理水を清浄にするものである。通常、多数の中空糸膜を束ね、それら中空糸膜の両端部を互いに接着固定して筒状ケース内に収容した中空糸膜モジュールの形態で使用され、該中空糸膜モジュールが複数、濾過塔内に懸架されて使用されることが多い(例えば、特許文献1、特許文献2)。   The hollow fiber membrane filter is formed by forming a polymer such as polyethylene or polysulfone into a hollow fiber membrane with a porous structure, and water to be treated from the outer surface side to the inner surface side of the polymer hollow fiber membrane (or vice versa). By allowing the water to permeate, the water to be treated is cleaned by physically filtering fine particles having a diameter greater than or equal to the membrane pore diameter on the surface of the membrane outer surface. Usually, it is used in the form of a hollow fiber membrane module in which a large number of hollow fiber membranes are bundled and both ends of the hollow fiber membranes are bonded and fixed together and accommodated in a cylindrical case. In many cases, it is used by being suspended inside (for example, Patent Document 1 and Patent Document 2).

このような中空糸膜モジュールを用い濾過を継続して行うと、被処理水中の微粒子等は中空糸膜外面側表面に堆積層を形成し、次第に堆積層が増加する。この堆積層は、被処理水が通過する時に流動抵抗となり、一定の濾過水量を得る運転を継続した場合、中空糸膜モジュールの圧力損失が次第に上昇する。   When filtration is continued using such a hollow fiber membrane module, fine particles in the water to be treated form a deposited layer on the outer surface of the hollow fiber membrane, and the deposited layer gradually increases. This deposited layer becomes a flow resistance when the water to be treated passes, and the pressure loss of the hollow fiber membrane module gradually increases when the operation for obtaining a constant amount of filtered water is continued.

中空糸膜モジュールの圧力損失が上昇すると、中空糸膜の外面側と内面側との間の圧力差が大きくなり、中空糸膜が圧力差に耐え切れず、潰れて濾過不可能となることがある。また、中空糸膜が潰れないとしても、一定流量を得る為にポンプ吐出圧を上昇させる必要が生じ、安定した用水確保の効率が低下する。   When the pressure loss of the hollow fiber membrane module increases, the pressure difference between the outer surface side and the inner surface side of the hollow fiber membrane increases, and the hollow fiber membrane cannot withstand the pressure difference and is crushed and cannot be filtered. is there. Moreover, even if the hollow fiber membrane is not crushed, it is necessary to increase the pump discharge pressure in order to obtain a constant flow rate, and the efficiency of securing stable water supply decreases.

この為、通水停止後、中空糸膜モジュールを濾過塔内に垂直に懸架して使用している場合、中空糸膜モジュールの筒状ケースの下部より空気を中空糸膜モジュール内部に導入し、中空糸膜モジュール内部を気液混合状態として中空糸膜を振動させる方法により、中空糸膜表面に堆積した微粒子層を剥離する。この操作を空気逆洗と呼ぶが、空気逆洗後、濾過塔内並びに中空糸膜モジュール内部には、中空糸膜に堆積していた微粒子が空気逆洗で剥離し、高濃度で存在することになる。   For this reason, after the water flow is stopped, when the hollow fiber membrane module is suspended vertically in the filtration tower and used, air is introduced into the hollow fiber membrane module from the bottom of the cylindrical case of the hollow fiber membrane module, The fine particle layer deposited on the surface of the hollow fiber membrane is peeled off by a method of vibrating the hollow fiber membrane while the hollow fiber membrane module is in a gas-liquid mixed state. This operation is called air backwashing. After air backwashing, fine particles deposited on the hollow fiber membranes are separated by air backwashing in the filtration tower and inside the hollow fiber membrane module and exist in a high concentration. become.

これらの高濃度微粒子含有液体を濾過塔内並びに中空糸膜モジュール内から排出する為に、濾過塔内の前記液体を排出し、濾過塔内並びに中空糸膜モジュール内を清浄にして再び運転を行う操作を繰り返している。中空糸膜表面に堆積した微粒子層を効率よく空気逆洗で剥離し、且つ、剥離後の微粒子を中空糸膜モジュール内から効率よく排出する為に、中空糸膜モジュールの筒状ケースには、中空糸膜の上下の接着固定部の端部に対応する位置に、中空糸膜モジュール内外を連通する開口穴を設けている。   In order to discharge these high-concentration fine particle-containing liquids from the inside of the filtration tower and the hollow fiber membrane module, the liquid in the filtration tower is discharged, the inside of the filtration tower and the hollow fiber membrane module are cleaned, and the operation is performed again. The operation is repeated. In order to efficiently separate the fine particle layer deposited on the surface of the hollow fiber membrane by backwashing with air, and to efficiently discharge the fine particles after separation from the hollow fiber membrane module, Opening holes for communicating the inside and outside of the hollow fiber membrane module are provided at positions corresponding to the ends of the upper and lower adhesive fixing portions of the hollow fiber membrane.

この開口穴を中空糸膜の端部に対応する位置に設ける理由は、中空糸膜モジュールを濾過塔内に垂直に懸架して使用する場合、中空糸膜上端部側の開口穴をモジュール上端部の中空糸膜接着固定部直近に配置し、モジュール内で可能な限り上部濾過部まで気液混合状態とし、中空糸膜の上端部まで微粒子層の剥離をさせることで効率的な逆洗を行えるようにする為である。また、中空糸膜下端部側の開口穴はモジュール下端部の中空糸膜接着固定部直近に配置し、空気による逆洗後の高濃度微粒子含有液体を効率よく中空糸膜モジュール外に排出することで効率的な逆洗を行えるようにする為である。
特開平9−155165号公報 特開2002−336663号公報
The reason for providing this opening hole at a position corresponding to the end of the hollow fiber membrane is that when the hollow fiber membrane module is used suspended vertically in the filtration tower, the opening hole on the upper end side of the hollow fiber membrane is located at the upper end of the module. It is arranged in the vicinity of the hollow fiber membrane adhesive fixing part of the module, the gas-liquid mixing state is made up to the upper filtration part as much as possible in the module, and the fine particle layer is peeled off to the upper end part of the hollow fiber membrane so that efficient back washing can be performed It is for doing so. In addition, the opening hole on the lower end of the hollow fiber membrane is arranged in the vicinity of the hollow fiber membrane adhesive fixing part on the lower end of the module, and the high-concentration fine particle-containing liquid after backwashing with air is efficiently discharged out of the hollow fiber membrane module. This is to enable efficient backwashing.
JP-A-9-155165 JP 2002-336663 A

しかしながら、中空糸膜のモジュールを用いた濾過装置の省スペース化(コンパクト化)や高性能化を図る為、中空糸膜モジュールの被処理水の濾過能力を上昇させようとすると、一般に、濾過処理時における上記開口穴から中空糸膜モジュール内部への水流の流動応力が上昇する。このとき、モジュール上下に位置する中空糸膜の接着固定部では、接着剤の中空糸膜への染込みにより物理的強度が弱くなっていることがあり、且つ、接着固定により、中空糸膜の接着固定部の中空糸膜は可動範囲が少なくなり、流動応力が緩和されにくい状態にある。従って、中空糸膜モジュールの濾過能力向上の為に、開口穴から中空糸膜モジュール内部への水流の流動応力を上昇させると、中空糸膜が接着固定端部で多数切断あるいは損傷し、却って濾過性能が低下する減少が生じるおそれがある。   However, in order to save space (compact) and improve the performance of the filtration device using the hollow fiber membrane module, it is generally considered that the filtration treatment of the treated water of the hollow fiber membrane module is increased. The flow stress of the water flow from the opening hole to the inside of the hollow fiber membrane module at the time increases. At this time, in the adhesive fixing part of the hollow fiber membrane positioned above and below the module, the physical strength may be weakened due to the penetration of the adhesive into the hollow fiber membrane, and the hollow fiber membrane is The hollow fiber membrane of the adhesive fixing part has a small movable range and is in a state where the flow stress is not easily relaxed. Therefore, when the flow stress of the water flow from the opening hole to the inside of the hollow fiber membrane module is increased in order to improve the filtration capacity of the hollow fiber membrane module, the hollow fiber membrane is cut or damaged in a large number at the adhesive fixed end, and the filtration is performed instead. There is a risk of a decrease in performance.

そこで本発明の課題は、上記のような問題点に着目し、中空糸膜の接着固定端部での水流の流動応力による切断や損傷を防止し、濾過装置のコンパクト化や高性能化を図る際にも、優れた濾過性能を維持できるようにした中空糸膜モジュールの構造を提供することにある。   Therefore, the object of the present invention is to focus on the above-mentioned problems, prevent cutting and damage due to the flow stress of the water flow at the bonded fixed end of the hollow fiber membrane, and to achieve a compact and high-performance filtration device. In particular, an object of the present invention is to provide a structure of a hollow fiber membrane module that can maintain excellent filtration performance.

上記課題を解決するために、本発明に係る中空糸膜モジュールは、複数本束ねた中空糸膜の両端部を互いに接着固定して中空糸膜束を筒状ケースに収容し、該筒状ケースの内外を連通する開口穴を通して導入された被処理水を各中空糸膜の外面側から内面側へと透過させて濾過する中空糸膜モジュールにおいて、前記開口穴を、その端部と前記中空糸膜同士の接着固定部の端部とが10mm以上離間するように配置したことを特徴とするものからなる。この形態は、中空糸膜の一端側にのみ採用することも可能であるが、好ましくは、中空糸膜の両端部においてこの形態を採用する。   In order to solve the above-described problems, a hollow fiber membrane module according to the present invention is configured such that a plurality of bundled hollow fiber membranes are bonded and fixed to each other so that the hollow fiber membrane bundle is accommodated in a cylindrical case. In the hollow fiber membrane module that filters the water to be treated introduced through the opening hole communicating between the inside and outside of the hollow fiber membrane from the outer surface side to the inner surface side of each hollow fiber membrane, the opening hole has its end and the hollow fiber It consists of what was arrange | positioned so that the edge part of the adhesion fixing part of membranes might be spaced apart 10 mm or more. Although this form can be adopted only at one end side of the hollow fiber membrane, this form is preferably adopted at both ends of the hollow fiber membrane.

このような中空糸膜モジュールは、例えば所定の複数本、塔内に設けられたモジュール懸架用板に懸架されて濾過装置として構成することができる。この際には、各中空糸膜モジュールの前記開口穴が、前記モジュール懸架用板からも10mm以上離間した位置に配置されていることが好ましい。このような開口穴の配置によって、被処理水が開口穴を通してモジュール内へと流入する際、モジュール懸架用板に当たり方向転換された直後の流速の速い水流が直接開口穴を通して流入することを回避でき、モジュール内の中空糸膜に過大な流動応力が加わることが防止される。   Such a hollow fiber membrane module can be configured as a filtration device, for example, by being suspended by a predetermined plurality of module suspension plates provided in the tower. In this case, it is preferable that the opening hole of each hollow fiber membrane module is disposed at a position spaced 10 mm or more away from the module suspension plate. With such an arrangement of the opening holes, when the water to be treated flows into the module through the opening holes, it is possible to avoid a flow of water having a high flow rate immediately after being turned against the module suspension plate from directly flowing through the opening holes. Further, excessive flow stress is prevented from being applied to the hollow fiber membrane in the module.

また、上記開口穴における水流の線流速としては、0.9m/秒以下に設定されていることが好ましい。この線流速の設定によって、流動応力が過大になることが防止され、流動応力の低減を図ることができる。線流速の設定は、単位時間当たりの処理水量、開口穴のサイズ、個数等を勘案して、さらには塔内の水流の流動解析の結果等を参照して決めればよい。   Moreover, it is preferable that the linear flow velocity of the water flow in the opening hole is set to 0.9 m / second or less. By setting the linear flow velocity, the flow stress is prevented from becoming excessive, and the flow stress can be reduced. The setting of the linear flow velocity may be determined in consideration of the amount of treated water per unit time, the size and number of apertures, and the result of flow analysis of the water flow in the tower.

上記開口穴の端部と上記中空糸膜同士の接着固定部の端部との離間距離は、10mm以上であればよいが、あまり長い距離離間させると、空気逆洗時にモジュール内から空気が抜けにくくなったり、微粒子含有液体がモジュール内から排出されにくくなったりするので、上記離間距離は10〜100mmの範囲内にあることが好ましい。   The separation distance between the end of the opening hole and the end of the adhesive fixing part between the hollow fiber membranes may be 10 mm or more. However, if the separation distance is too long, air escapes from the module during backwashing with air. The separation distance is preferably in the range of 10 to 100 mm because it becomes difficult or the particulate-containing liquid is difficult to be discharged from the module.

本発明に係る中空糸膜モジュールによれば、濾過運転時に被処理水のモジュール内への導入穴となる開口穴を、その端部が中空糸膜同士の接着固定部の端部に対して10mm以上離間するように設置したので、被処理水導入に伴い中空糸膜の端部、とくに、接着固定部の端部にかかる流動応力が小さく抑えられ、中空糸膜の接着固定端部での水流の流動応力による切断や損傷の発生が防止される。したがって、モジュール内の各中空糸膜が所定の形態、所定の性能に維持され、処理水質の長期維持が可能となる。また、各中空糸膜の切断や損傷が防止されるので、容易に中空糸膜モジュール、ひいては濾過装置全体のコンパクト化や高性能化を図ることができるようになる。   According to the hollow fiber membrane module according to the present invention, the opening hole serving as the introduction hole into the module to be treated at the time of filtration operation is 10 mm with respect to the end of the adhesive fixing part between the hollow fiber membranes. Since it is installed so as to be separated from the above, the flow stress applied to the end of the hollow fiber membrane, particularly the end of the adhesive fixing portion with the introduction of the water to be treated is reduced, and the water flow at the adhesive fixing end of the hollow fiber membrane is suppressed. The occurrence of cutting and damage due to the flow stress is prevented. Therefore, each hollow fiber membrane in the module is maintained in a predetermined form and a predetermined performance, and the treated water quality can be maintained for a long time. Further, since each hollow fiber membrane is prevented from being cut or damaged, the hollow fiber membrane module, and thus the entire filtration device, can be easily made compact and high performance.

以下に、本発明の望ましい実施の形態を、図面を参照して説明する。
図1は、本発明の一実施態様に係る中空糸膜モジュールを適用した濾過装置の一例を示している。図1において、1は濾過塔を示しており、濾過塔1内は、モジュール懸架用板2によって上室3と下室4とに区画されている。モジュール懸架用板2には中空糸膜モジュール5の上端が懸架されており、中空糸膜モジュール5は、上端がモジュール懸架用板2に固定された状態で下室4内に垂設されている。図1には1本の中空糸膜モジュール5のみを示してあるが、濾過塔1内には多数本の中空糸膜モジュール5が垂設されている。6は、中空糸膜逆洗時のスクラビング用気体導入、分配機能と通水時の原水(被処理水)整流機能を有する下部仕切板であり、この仕切板6に各中空糸膜モジュール5の懸架数に等しい数のスクラビング用気体噴出口(図示略)が設けられているとともに、各中空糸膜モジュール5の下端が固定されている。7は濾過塔1内への原水(被処理水)の入口を示しており、下室4に流入された原水は各中空糸膜モジュール5で濾過された後上室3へ流出され、出口8を通して所定の行先へと送られるようになっている。9はドレン管、10はスクラビング用気体の導入口、11は、下室4を満水にした状態でスクラビングを行ったときの気体排出のためのベント口を示している。
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an example of a filtration device to which a hollow fiber membrane module according to an embodiment of the present invention is applied. In FIG. 1, reference numeral 1 denotes a filtration tower, and the inside of the filtration tower 1 is partitioned into an upper chamber 3 and a lower chamber 4 by a module suspension plate 2. The upper end of the hollow fiber membrane module 5 is suspended on the module suspension plate 2, and the hollow fiber membrane module 5 is suspended in the lower chamber 4 with the upper end fixed to the module suspension plate 2. . Although only one hollow fiber membrane module 5 is shown in FIG. 1, a large number of hollow fiber membrane modules 5 are suspended in the filtration tower 1. Reference numeral 6 denotes a lower partition plate having a scrubbing gas introduction / distribution function at the time of hollow fiber membrane backwashing and a raw water (treated water) rectification function at the time of passing water. The number of scrubbing gas outlets (not shown) equal to the number of suspensions is provided, and the lower end of each hollow fiber membrane module 5 is fixed. Reference numeral 7 denotes an inlet of raw water (treated water) into the filtration tower 1. The raw water that has flowed into the lower chamber 4 is filtered by each hollow fiber membrane module 5 and then flows out into the upper chamber 3, where the outlet 8 To be sent to a predetermined destination. 9 is a drain pipe, 10 is an inlet for scrubbing gas, and 11 is a vent for discharging gas when scrubbing is performed with the lower chamber 4 filled.

各中空糸膜モジュール5においては、図2に示すように、多数の中空糸膜21が束ねられ、筒状ケース22内に平行に延びるように収容されている。束ねられた中空糸膜21は、その両端部が筒状ケース22内で接着用樹脂を用いて互いに接着固定されている。これら接着固定部23a、23bは上側(モジュール懸架用板2側)、下側とに形成されるが、各接着固定部は、2層に構成されてもよい(例えば、いわゆるポッティング部と緩衝層部の2層)。中空糸膜21の束を収容した筒状ケース22には、該筒状ケース22の内外を連通する開口穴24a、24bが設けられ、これら開口穴24a、24bを通して導入された被処理水が各中空糸膜21の外面側から内面側へと透過されて濾過される。上側の開口穴24aおよび下側の開口穴24bは、筒状ケース22の周方向に複数配置されており、それぞれ、一列に設けられていてもよく、複数列(二列以上)の形態に設けられていてもよい、図示例は、二列配置を示しており、モジュール長手方向中央側の開口穴列を二点鎖線で示してある。   In each hollow fiber membrane module 5, as shown in FIG. 2, a large number of hollow fiber membranes 21 are bundled and accommodated in a cylindrical case 22 so as to extend in parallel. Both ends of the bundled hollow fiber membranes 21 are bonded and fixed to each other in the cylindrical case 22 using an adhesive resin. These adhesive fixing portions 23a and 23b are formed on the upper side (module suspension plate 2 side) and the lower side, but each adhesive fixing portion may be configured in two layers (for example, a so-called potting portion and a buffer layer). Part two layers). The cylindrical case 22 containing the bundle of hollow fiber membranes 21 is provided with opening holes 24a and 24b communicating with the inside and outside of the cylindrical case 22, and the water to be treated introduced through the opening holes 24a and 24b is respectively The hollow fiber membrane 21 is filtered from the outer surface side to the inner surface side. A plurality of the upper opening holes 24a and the lower opening holes 24b are arranged in the circumferential direction of the cylindrical case 22, and each may be provided in a single row, or provided in the form of a plurality of rows (two or more rows). The illustrated example, which may be provided, shows a two-row arrangement, and an opening hole row on the center side in the module longitudinal direction is indicated by a two-dot chain line.

上記開口穴24a、24bが、その端部と前記接着固定部23a、23bの端部とが10mm以上離間するように配置されている。より詳しくは、上側の開口穴24aの端部と上側の接着固定部23aの端部との離間距離L1、下側の開口穴24bの端部と下側の接着固定部23bの端部との離間距離L2が、それぞれ10mm以上離間される。これら離間距離の上限についてはとくに限定されないものの、上側については、逆洗時の空気(気体)の抜けやすさを考慮して、下側については、逆洗後の微粒子含有液体の排出されやすさ(残留のしにくさ)を考慮して決定すればよい。この面からは、上記離間距離としては10〜100mmの範囲内、好ましくは25〜50mmの範囲内から設定することができる(例えば、上側の離間距離L1が50mm、下側の離間距離L2が25mm程度に設定されることが好ましい)。   The opening holes 24a and 24b are arranged such that the end portions thereof are separated from the end portions of the adhesive fixing portions 23a and 23b by 10 mm or more. More specifically, the distance L1 between the end portion of the upper opening hole 24a and the end portion of the upper adhesive fixing portion 23a, and the end portion of the lower opening hole 24b and the end portion of the lower adhesive fixing portion 23b. The separation distance L2 is separated by 10 mm or more. Although the upper limit of these separation distances is not particularly limited, in consideration of the ease of escape of air (gas) at the time of backwashing on the upper side, it is easy to discharge the fine particle-containing liquid after backwashing on the lower side. It may be determined in consideration of (hardness of residual). From this surface, the above-mentioned separation distance can be set within a range of 10 to 100 mm, preferably within a range of 25 to 50 mm (for example, the upper separation distance L1 is 50 mm and the lower separation distance L2 is 25 mm). Is preferably set to a degree).

また、濾過塔1内から開口穴を通して被処理水が筒状ケース22内に流入する際に、とくにモジュール懸架用板2付近では、モジュール懸架用板2に当たった水流が方向転換した後直接開口穴24aを通して流入すると、水流が速くなりすぎるおそれがあるので、モジュール懸架用板2と開口穴24aの端部との離間距離L3も、10mm以上に設定されていることが好ましい。   Further, when the water to be treated flows from the inside of the filtration tower 1 into the cylindrical case 22 through the opening hole, particularly in the vicinity of the module suspension plate 2, the water flow hits the module suspension plate 2 and is directly opened after the direction is changed. If it flows through the hole 24a, the water flow may become too fast. Therefore, the separation distance L3 between the module suspension plate 2 and the end of the opening hole 24a is preferably set to 10 mm or more.

上記各開口穴24a、24bのサイズ(径)や個数、さらにはそれらの配置位置は、各開口穴部分における水流の線流速が0.9m/秒以下(つまり、最高でも0.9m/秒以下)になるように設定されていることが好ましい。これによって、過大な流動応力が中空糸膜21に加わることが防止される。   The size (diameter) and the number of each of the opening holes 24a and 24b, and the arrangement position thereof are such that the linear velocity of the water flow in each opening hole portion is 0.9 m / second or less (that is, 0.9 m / second or less at the maximum) ) Is preferably set. This prevents an excessive flow stress from being applied to the hollow fiber membrane 21.

上記のように構成された中空糸膜モジュール5においては、濾過運転時に被処理水のモジュール5内への導入穴となる開口穴24a、24bが、それらの端部が接着固定部23a、23bの端部に対して10mm以上離間するように設置されているので、接着固定部23a、23bにより位置、姿勢が固定されている各中空糸膜21の接着固定部23a、23b直近部において、開口穴24a、24bを通して導入されてくる被処理水の流動応力に起因した、局部的に過大な応力(過大な曲げや引っ張り応力)が加わることが防止され、過大応力発生に伴う中空糸膜21の切断や損傷の発生が防止される。すなわち、開口穴24a、24bの端部と接着固定部23a、23bの端部とが10mm以上離間しているので、ポリマーからなる中空糸膜21のこの部分に、十分な応力の緩和代が与えられ、切断や損傷を発生させるような過大な局部応力の発生が防止される。その結果、中空糸膜モジュール5内の各中空糸膜21が所定の形態、所定の性能に維持され、処理水質の長期維持が可能となる。また、各中空糸膜21の切断や損傷が防止されるので、容易に中空糸膜モジュール5、ひいては濾過装置全体のコンパクト化や高性能化を図ることができるようになる。   In the hollow fiber membrane module 5 configured as described above, the opening holes 24a and 24b serving as introduction holes into the module 5 to be treated at the time of the filtration operation have their end portions of the adhesive fixing portions 23a and 23b. Since it is installed so as to be separated by 10 mm or more with respect to the end portion, an opening hole is provided in the immediate vicinity of the adhesive fixing portions 23a and 23b of each hollow fiber membrane 21 whose position and posture are fixed by the adhesive fixing portions 23a and 23b. Cutting of the hollow fiber membrane 21 due to the occurrence of excessive stress is prevented by applying excessive stress (excessive bending or tensile stress) due to the flow stress of the water to be treated introduced through 24a and 24b. Or damage is prevented. That is, since the end portions of the opening holes 24a and 24b and the end portions of the adhesive fixing portions 23a and 23b are separated by 10 mm or more, a sufficient stress relaxation allowance is given to this portion of the hollow fiber membrane 21 made of polymer. Therefore, generation of excessive local stress that causes cutting or damage is prevented. As a result, each hollow fiber membrane 21 in the hollow fiber membrane module 5 is maintained in a predetermined form and a predetermined performance, and the treated water quality can be maintained for a long time. Further, since the hollow fiber membranes 21 are prevented from being cut or damaged, the hollow fiber membrane module 5 and thus the entire filtration device can be easily made compact and high performance.

上記の開口穴の端部と接着固定部の端部との離間距離に関して、以下のような比較試験を行った。実施例、比較例の開口穴−接着固定部離間距離と、開口穴数の条件を表1、表2に示す。実施例、比較例とも、モジュールの上下部における開口穴の配置は、モジュール周方向に複数、一列配置とした。筒状ケースは、内径123.4mm、長さ2500mmのものを使用し、中空糸膜は、ポリスルホン製で、上下の接着固定部の有効長さが2200mmのものを、7500本/1モジュールにて使用した。被処理水の通水流速は、各開口穴における最大値が0.785m/秒になるように設定して、1モジュール当たりの通水時間と中空糸膜の糸切れ本数との関係を測定した。結果を図3に示す。   The following comparative tests were conducted with respect to the separation distance between the end portion of the opening hole and the end portion of the adhesive fixing portion. Tables 1 and 2 show the conditions of the opening hole-adhesive fixing part separation distance and the number of opening holes in Examples and Comparative Examples. In both the examples and the comparative examples, the arrangement of the opening holes in the upper and lower portions of the module was arranged in a plurality of rows in the module circumferential direction. The cylindrical case has an inner diameter of 123.4 mm and a length of 2500 mm. The hollow fiber membrane is made of polysulfone, and the upper and lower adhesive fixing portions have an effective length of 2200 mm at 7500/1 module. used. The flow rate of water to be treated was set so that the maximum value in each opening hole was 0.785 m / sec, and the relationship between the water flow time per module and the number of broken yarns in the hollow fiber membrane was measured. . The results are shown in FIG.

図3から明らかな如く、離間距離を10mmとした実施例では、離間距離が0mmの比較例に比べて、糸切れ本数が大幅に減少し、安定した形態、性能を長時間維持できることが分かった。   As is apparent from FIG. 3, in the example in which the separation distance was 10 mm, the number of yarn breakage was significantly reduced compared to the comparative example in which the separation distance was 0 mm, and it was found that a stable form and performance could be maintained for a long time. .

Figure 2006159135
Figure 2006159135

Figure 2006159135
Figure 2006159135

本発明に係る中空糸膜モジュールは、開口穴を備えたあらゆる中空糸膜モジュールに適用可能であり、とくに、濾過塔内に多数懸架されて使用される中空糸膜モジュールに公的なものである。   The hollow fiber membrane module according to the present invention can be applied to any hollow fiber membrane module having an opening hole, and is particularly official for a hollow fiber membrane module used by being suspended in a large number in a filtration tower. .

本発明の一実施態様に係る中空糸膜モジュールを適用した濾過装置の一例を示す概略縦断面図である。It is a schematic longitudinal cross-sectional view which shows an example of the filtration apparatus to which the hollow fiber membrane module which concerns on one embodiment of this invention is applied. 図1の中空糸膜モジュールの半断面図である。FIG. 2 is a half sectional view of the hollow fiber membrane module of FIG. 1. 比較試験の結果を示す通水時間と糸切れ本数との関係図である。It is a relationship figure of the water passing time and the number of thread breakage which show the result of a comparative test.

符号の説明Explanation of symbols

1 濾過塔
2 モジュール懸架用板
3 上室
4 下室
5 中空糸膜モジュール
6 下部仕切板
7 原水(被処理水)の入口
8 濾過水出口
9 ドレン管
10 スクラビング用気体の導入口
11 ベント口
21 中空糸膜
22 筒状ケース
23a、23b 接着固定部
24a、24b 開口穴
L1、L2 開口穴の端部と接着固定部の端部との離間距離
DESCRIPTION OF SYMBOLS 1 Filtration tower 2 Module suspension board 3 Upper chamber 4 Lower chamber 5 Hollow fiber membrane module 6 Lower partition plate 7 Raw water (treated water) inlet 8 Filtrated water outlet 9 Drain pipe 10 Scrubbing gas inlet 11 Vent 21 Hollow fiber membrane 22 Cylindrical cases 23a, 23b Adhesive fixing portions 24a, 24b Opening holes L1, L2 Distance between the end of the opening hole and the end of the adhesive fixing portion

Claims (4)

複数本束ねた中空糸膜の両端部を互いに接着固定して中空糸膜束を筒状ケースに収容し、該筒状ケースの内外を連通する開口穴を通して導入された被処理水を各中空糸膜の外面側から内面側へと透過させて濾過する中空糸膜モジュールにおいて、前記開口穴を、その端部と前記中空糸膜同士の接着固定部の端部とが10mm以上離間するように配置したことを特徴とする中空糸膜モジュール。   Both ends of the bundled hollow fiber membranes are bonded and fixed to each other, the hollow fiber membrane bundle is accommodated in a cylindrical case, and the water to be treated introduced through the opening hole that communicates the inside and outside of the cylindrical case is supplied to each hollow fiber. In a hollow fiber membrane module that permeates and filters from the outer surface side of the membrane to the inner surface side, the opening hole is arranged so that the end portion thereof and the end portion of the adhesive fixing portion between the hollow fiber membranes are separated by 10 mm or more A hollow fiber membrane module characterized by that. 塔内に設けられたモジュール懸架用板に懸架され、前記開口穴が、前記モジュール懸架用板からも10mm以上離間した位置に配置されている、請求項1の中空糸膜モジュール。   The hollow fiber membrane module according to claim 1, wherein the hollow fiber membrane module is suspended on a module suspension plate provided in a tower, and the opening hole is disposed at a position spaced 10 mm or more away from the module suspension plate. 前記開口穴における水流の線流速が0.9m/秒以下に設定されている、請求項1または2の中空糸膜モジュール。   The hollow fiber membrane module according to claim 1 or 2, wherein a linear flow velocity of the water flow in the opening hole is set to 0.9 m / second or less. 前記開口穴の端部と前記中空糸膜同士の接着固定部の端部との離間距離が10〜100mmの範囲内にある、請求項1〜3のいずれかに記載の中空糸膜モジュール。   The hollow fiber membrane module in any one of Claims 1-3 in which the separation distance of the edge part of the said opening hole and the edge part of the adhesion fixing part of the said hollow fiber membranes exists in the range of 10-100 mm.
JP2004356940A 2004-12-09 2004-12-09 Hollow fiber membrane module Pending JP2006159135A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09155165A (en) * 1995-12-09 1997-06-17 Japan Organo Co Ltd Hollow fiber membrane filter apparatus
JPH11207152A (en) * 1998-01-26 1999-08-03 Hitachi Ltd Hollow yarn membrane module
JP2002336663A (en) * 2001-05-17 2002-11-26 Japan Organo Co Ltd Filtration apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09155165A (en) * 1995-12-09 1997-06-17 Japan Organo Co Ltd Hollow fiber membrane filter apparatus
JPH11207152A (en) * 1998-01-26 1999-08-03 Hitachi Ltd Hollow yarn membrane module
JP2002336663A (en) * 2001-05-17 2002-11-26 Japan Organo Co Ltd Filtration apparatus

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