JPH06178921A - Method for cleaning external pressure type hollow fiber membrane module - Google Patents
Method for cleaning external pressure type hollow fiber membrane moduleInfo
- Publication number
- JPH06178921A JPH06178921A JP4353132A JP35313292A JPH06178921A JP H06178921 A JPH06178921 A JP H06178921A JP 4353132 A JP4353132 A JP 4353132A JP 35313292 A JP35313292 A JP 35313292A JP H06178921 A JPH06178921 A JP H06178921A
- Authority
- JP
- Japan
- Prior art keywords
- raw water
- hollow fiber
- fiber membrane
- membrane
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 98
- 239000012510 hollow fiber Substances 0.000 title claims abstract description 58
- 238000004140 cleaning Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 93
- 238000005201 scrubbing Methods 0.000 claims description 39
- 238000001914 filtration Methods 0.000 claims description 12
- 239000011550 stock solution Substances 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 5
- 238000005192 partition Methods 0.000 description 6
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000010008 shearing Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 238000011001 backwashing Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000009285 membrane fouling Methods 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/02—Hollow fibre modules
- B01D63/024—Hollow fibre modules with a single potted end
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
- B01D65/04—Membrane cleaning or sterilisation ; Membrane regeneration with movable bodies, e.g. foam balls
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は外圧式中空糸膜モジュ−
ルの洗浄方法に関するものである。BACKGROUND OF THE INVENTION The present invention relates to an external pressure type hollow fiber membrane module.
It relates to a cleaning method.
【０００２】[0002]
【従来の技術】純水や用水の造水プロセス、食品や薬品
等の製造プロセス、排水処理プロセス等において、原水
からの固形物質等の分離に膜モジュ−ルを使用すること
がある。2. Description of the Related Art Membrane modules are sometimes used to separate solid substances from raw water in a process for producing pure water or water, a process for producing foods or chemicals, a process for treating waste water and the like.
【０００３】膜モジュ−ルには、管状型、スパスラル
型、プレ−ト＆フレ−ム型、中空糸型等が存在するが、
中空糸膜モジュ−ルにおいては、単位容積当たりの膜面
積を大きくとれ、モジュ−ルのコンパクト化を図ること
ができ、特に、縦型設置とすることにより単位設置スペ
−ス当たりの処理能力を大きくできるので、有利であ
る。As the membrane module, there are a tubular type, a spiral type, a plate & frame type, a hollow fiber type and the like.
In the hollow fiber membrane module, the membrane area per unit volume can be made large, and the module can be made compact. In particular, the vertical installation can improve the processing capacity per unit installation space. This is advantageous because it can be increased.
【０００４】膜モジュ−ルによる濾過においては、経時
的な膜汚染による濾過速度の低下が避けられず、適時、
膜洗浄を行い、濾過速度を所定値以上の高速度に維持す
ることが必要である。In filtration using a membrane module, a decrease in filtration rate due to membrane fouling with time is unavoidable.
It is necessary to wash the membrane and maintain the filtration rate at a high speed above a predetermined value.
【０００５】従来、縦型設置の外圧式中空糸膜モジュ−
ルの膜洗浄方法としてエア−スクラビング法、すなわ
ち、原水で満たされた原水室内の中空糸膜束の直下か
ら、ノズルによりエア−を送入し、このエア−を気泡化
し、この気液混合流を原水と共に中空糸膜束内の間隙に
沿って上昇させていく方法が公知である（例えば、特開
昭６１−５３５９９号）。このエア−スクラビング法に
おいては、気液混合上昇流による付着スケ−ルの剥離、
中空糸膜の動揺による付着スケ−ルの剥離等によって洗
浄が行われる。Conventionally, an external pressure type hollow fiber membrane module installed vertically
Air scrubbing method as a membrane cleaning method, that is, air is fed from a nozzle directly below the hollow fiber membrane bundle in the raw water chamber filled with raw water, the air is bubbled, and the gas-liquid mixed flow is generated. There is known a method of raising the water along with a gap in the hollow fiber membrane bundle together with the raw water (for example, JP-A-61-53599). In this air-scrubbing method, separation of adhering scale by gas-liquid mixed upflow,
Cleaning is performed by peeling off the adhesion scale due to shaking of the hollow fiber membrane.
【０００６】[0006]
【発明が解決しようとする課題】縦型設置の中空糸膜モ
ジュ−ルとして、中空糸膜束の片端を固定支持し、他端
を自由状態とした外圧型の中空糸膜モジュ−ルが公知で
ある。しかしながら、この縦型設置の外圧式中空糸膜モ
ジュ−ルを上記したエア−スクラビング法により膜洗浄
すると、中空糸膜が片端支持・他端自由状態の所謂、片
持ち梁式で支持されているために、中空糸膜の支持端に
曲げ応力が集中し、この箇所で膜折が発生し易い。ま
た、膜同士による、摩擦若しくは衝突により膜外表面の
孔が閉塞し、透過能力を満足に回復させ難い。As a hollow fiber membrane module for vertical installation, an external pressure type hollow fiber membrane module in which one end of a hollow fiber membrane bundle is fixedly supported and the other end is in a free state is known. Is. However, when this externally installed external pressure type hollow fiber membrane module is subjected to membrane cleaning by the above-mentioned air-scrubbing method, the hollow fiber membrane is supported by a so-called cantilever type in which one end is supported and the other end is free. Therefore, bending stress is concentrated on the supporting end of the hollow fiber membrane, and the membrane is likely to be broken at this location. Further, the pores on the outer surface of the membrane are closed due to friction or collision between the membranes, and it is difficult to satisfactorily restore the permeation ability.
【０００７】かかる不利を回避するために、エア−の吹
き込み量を低減すると、洗浄効果の低下が避けられず、
洗浄に長時間を必要とし、作業能率の低下が余儀なくさ
れるばかりか、膜の濾過速度の回復率が低く、膜洗浄に
もかかわらず充分な濾過速度を保証し難い。In order to avoid such a disadvantage, if the blowing amount of air is reduced, the cleaning effect is unavoidably deteriorated.
It requires a long time for washing, which inevitably lowers the work efficiency, and the recovery rate of the filtration rate of the membrane is low, and it is difficult to guarantee a sufficient filtration rate despite the membrane washing.
【０００８】本発明の目的は、中空糸膜の一端を自由状
態とした縦型設置の外圧式中空糸膜モジュ−ルを膜折
れ、膜外表面へのダメ−ジを伴うことなく優れた効率で
膜洗浄できる外圧式中空糸膜モジュ−ルの洗浄方法を提
供することにある。An object of the present invention is to provide a vertical type external pressure type hollow fiber membrane module in which one end of the hollow fiber membrane is in a free state, and is excellent in efficiency without causing damage to the outer surface of the membrane. It is an object of the present invention to provide a method for cleaning an external pressure type hollow fiber membrane module that can be used for membrane cleaning with.
【０００９】[0009]
【課題を解決するための手段】本発明の外圧式中空糸膜
モジュ−ルの洗浄方法は、中空糸膜束の片端を固定支持
し、他端を自由状態とした外圧式中空糸膜モジュ−ルに
原水を供給して濾過する途中において、スポンジ製の擦
洗ボ−ルを原水に投入し、該擦洗ボ−ルを原水と共に上
記モジュ−ル内の原水通路に通過させることを特徴とす
る構成であり、擦洗ボ−ルをモジュ−ル内の原水通路に
通過させる方向を、中空糸膜束の片端から他端に向かう
方向とすること、擦洗ボ−ルの直径は中空糸膜の外径の
１〜１０倍とすることが好ましい。The method for cleaning an external pressure type hollow fiber membrane module of the present invention is an external pressure type hollow fiber membrane module in which one end of a hollow fiber membrane bundle is fixedly supported and the other end is in a free state. In the middle of supplying raw water to the filter and filtering the raw water, a scrubbing scrubbing ball is introduced into the raw water, and the scrubbing ball is passed together with the raw water through a raw water passage in the module. The direction of passing the scrubbing ball through the raw water passage in the module is from the one end of the hollow fiber membrane bundle to the other end, and the diameter of the scrubbing ball is the outer diameter of the hollow fiber membrane. It is preferably 1 to 10 times.
【００１０】[0010]
【作用】擦洗ボ−ルが中空糸膜の外面に接触し、擦洗ボ
−ルと膜表面との接触界面に剪断力が作用し、膜表面の
付着スケ−ルが剥離・除去される。この場合、剪断力は
擦洗ボ−ルが原水流れから受ける力と当該擦洗ボ−ルに
作用する浮力とに依存し、浮力を大とすることによっ
て、原水流速の低速下、効果的な膜洗浄が行われる。The rubbing ball comes into contact with the outer surface of the hollow fiber membrane, and a shearing force acts on the contact interface between the rubbing ball and the membrane surface, whereby the scale attached to the membrane is peeled off and removed. In this case, the shearing force depends on the force that the scrubbing ball receives from the raw water flow and the buoyancy acting on the scrubbing ball, and by increasing the buoyancy, effective membrane cleaning under low flow rate of the raw water. Is done.
【００１１】[0011]
【実施例】以下、図面により本発明の実施例を説明す
る。本発明によって膜洗浄する外圧式中空糸膜モジュ−
ルは、中空糸膜束の片端を固定支持し、他端を自由状態
とした構成であり、図１はその一例を示している。図１
において、１１は縦型筒状ケ−スである。１２は筒状ケ
−ス内に収容した中空糸膜束である。１３は筒状ケ−ス
１１の下端に樹脂の注入により設けた樹脂隔壁であり、
この樹脂隔壁１３に中空糸膜束１２の下端部を支持し、
中空糸膜の下端開口121を当該樹脂隔壁１３の外面に開
通してある。他方、中空糸膜の上端122は閉塞し、自由
状態としてある。１４，…は樹脂隔壁１３に等間隔を隔
てて設けた複数箇の原水供給孔である。Embodiments of the present invention will be described below with reference to the drawings. External pressure type hollow fiber membrane module for membrane cleaning according to the present invention
1 has a structure in which one end of the hollow fiber membrane bundle is fixedly supported and the other end is in a free state, and FIG. 1 shows an example thereof. Figure 1
In the figure, 11 is a vertical cylindrical case. Reference numeral 12 is a hollow fiber membrane bundle housed in a cylindrical case. Reference numeral 13 denotes a resin partition wall provided by injecting resin at the lower end of the cylindrical case 11.
The resin partition wall 13 supports the lower end of the hollow fiber membrane bundle 12,
The lower end opening 121 of the hollow fiber membrane is opened to the outer surface of the resin partition wall 13. On the other hand, the upper end 122 of the hollow fiber membrane is closed and in a free state. Reference numerals 14, ... Are a plurality of raw water supply holes provided at equal intervals in the resin partition wall 13.
【００１２】１５はヘッダ−であり、隔壁１６により原
水室ａと濾過水室ｂとに仕切り、その隔壁１６に原水流
通用管151を水密に貫設し、原水室ａには原水供給口１
７を、濾過水室ｂには濾過水取出口１８をそれぞれ設け
てある。このヘッダ−１５を筒状ケ−ス１１の下端にＶ
バンド等により連結し、原水流通用管151を樹脂隔壁１
３の原水供給孔１４にＯリングを介して水密に挿入して
ある。１９は筒状ケ−ス１１の上端に設けた濃縮原水流
出口である。Reference numeral 15 denotes a header, which is partitioned by a partition wall 16 into a raw water chamber a and a filtered water chamber b, and a raw water distribution pipe 151 is provided in the partition wall 16 in a watertight manner, and the raw water supply port 1 is provided in the raw water chamber a.
7 and a filtered water outlet 18 is provided in the filtered water chamber b. This header-15 is attached to the lower end of the tubular case 11 by V
Connect the raw water distribution pipe 151 with a band, etc.
No. 3 of the raw water supply hole 14 is watertightly inserted through an O-ring. Reference numeral 19 is a concentrated raw water outlet provided at the upper end of the cylindrical case 11.
【００１３】この外圧式中空糸膜モジュ−ルにおいて
は、原水がヘッダ−１５の原水供給口１７、原水流通用
管151並びに原水供給孔１４を経て筒状ケ−ス１１内に
供給され、この供給原水が上側に向かって流動してい
き、この間、原水が中空糸膜１２によって濾過され、こ
の濾過により中空糸膜内に現れた濾過水がヘッダ−１５
の濾過水室ｂを経て濾過水取出口１８から取り出されて
いく。他方、上記の濾過によって濃縮された原水が筒状
ケ−ス上端の濃縮原水流出口１９から流出していく。In this external pressure type hollow fiber membrane module, raw water is supplied into the cylindrical case 11 through the raw water supply port 17 of the header 15, the raw water distribution pipe 151 and the raw water supply hole 14. The raw water supplied flows upward, and during this time, the raw water is filtered by the hollow fiber membranes 12, and the filtered water that appears in the hollow fiber membranes due to this filtration is transferred to the header-15.
It is taken out from the filtered water outlet 18 through the filtered water chamber b. On the other hand, the raw water concentrated by the above-mentioned filtration flows out from the concentrated raw water outlet 19 at the upper end of the cylindrical case.
【００１４】図２は本発明において使用する膜分離装置
の一例を示している。図２において、Ａは上記した外圧
式中空糸膜モジュ−ルであり、縦に設置してある。上記
した通り、１７は原水供給口、１９は濃縮原水流出口、
１８は濾過水取出口である。２１は原水供給ポンプ、２
２は原水供給配管、Ｖ1はモジュ−ル近傍において原水
供給配管２２に設けた開閉弁である。２３は擦洗ボ−ル
投入・回収器であり、流路的に独立の擦洗ボ−ル投入部
231と回収部232とを備え、擦洗ボ−ル投入部231の入口
並びに出口にそれぞれ上記開閉弁Ｖ1の入口側からの往
き管241並びに開閉弁Ｖ1の出口側への戻り管242を接続
し、往き管241並びに戻り管242のそれぞれに開閉弁
Ｖ2，Ｖ3を設けてある。FIG. 2 shows an example of the membrane separation device used in the present invention. In FIG. 2, A is the external pressure type hollow fiber membrane module described above, which is installed vertically. As described above, 17 is a raw water supply port, 19 is a concentrated raw water outlet,
Reference numeral 18 is a filtered water outlet. 21 is a raw water supply pump, 2
Reference numeral 2 is a raw water supply pipe, and V 1 is an opening / closing valve provided in the raw water supply pipe 22 near the module. Reference numeral 23 is a scrubbing ball charging / collecting device, which is a scrubbing ball charging section independent of the flow path.
231 and a recovery unit 232, Kosuaraibo - connect the return pipe 242 to the respective inlet and outlet of the Le-putting section 231 forward pipe 241 and the outlet side of the opening and closing valve V 1 of the the inlet side of the opening and closing valve V 1 On the other hand, the on-off valves V 2 and V 3 are provided on the forward pipe 241 and the return pipe 242, respectively.
【００１５】２５は濃縮原水流出配管、Ｖ4は濃縮原水
流出配管２５に設けた開閉弁であり、この配管２５とモ
ジュ−ルＡの濃縮原水流出口１９との間を開閉弁Ｖ5を
介して接続してある。また、上記の擦洗ボ−ル投入・回
収器２３の回収部232の入口とモジュ−ルＡの濃縮原水
取出口１９との間を開閉弁Ｖ6を介して接続し、同回収
部232の出口と濃縮原水流出配管２５との間を開閉弁Ｖ7
を介して接続してある。２６は原水循環配管である。２
７は濾過水取出配管である。Reference numeral 25 is a concentrated raw water outflow pipe, V 4 is an opening / closing valve provided in the concentrated raw water outflow pipe 25, and an opening / closing valve V 5 is provided between the pipe 25 and the concentrated raw water outlet 19 of the module A. Connected. Further, the inlet of the recovery section 232 of the scrubbing ball charging / recovering device 23 and the concentrated raw water outlet 19 of the module A are connected via an on-off valve V 6, and the outlet of the recovery section 232 is connected. Open / close valve V 7 between the concentrated raw water outflow pipe 25 and
Connected via. Reference numeral 26 is a raw water circulation pipe. Two
Reference numeral 7 is a filtered water extraction pipe.
【００１６】通常の運転時においては、弁Ｖ1，Ｖ5，Ｖ
4を開き、弁Ｖ2，Ｖ3，Ｖ6，Ｖ7を閉じて擦洗ボ−ル投
入・回収器２３をモジュ−ルＡから回路的に遮断し、ポ
ンプ２１の駆動により原水を原水供給配管２２、開閉弁
Ｖ1を経てモジュ−ルＡに供給し、モジュ−ルＡでの原
水室通過時、中空糸膜で濾過し、濾過により溶媒が濃縮
された原水、即ち、濃縮原水を濃縮原水流出配管１９か
ら排出すると共に一部の原水を循環配管２６を経て循環
させ、濾過水を濾過水取出配管２７から取り出してい
く。During normal operation, the valves V 1 , V 5 , V
4 is opened and valves V 2 , V 3 , V 6 and V 7 are closed to shut off the scrubbing ball charging / recovering device 23 from the module A in a circuit manner, and the pump 21 is driven to supply raw water to the raw water supply pipe. 22 and the open / close valve V 1 to supply to the module A, and when passing through the raw water chamber in the module A, the raw water in which the solvent is concentrated by filtration, that is, the concentrated raw water is concentrated raw water. The raw water is discharged from the outflow pipe 19, a part of the raw water is circulated through the circulation pipe 26, and the filtered water is taken out from the filtered water take-out pipe 27.
【００１７】本発明により膜モジュ−ルを洗浄するに
は、弁Ｖ1，Ｖ5を閉じ、弁Ｖ2，Ｖ3，Ｖ6，Ｖ7を開き、
また、弁Ｖ4を閉じて原水を全量循環させ、擦洗ボ−ル
投入・回収器２３の投入部231からスポンジ製の擦洗ボ
−ルを投入し、この擦洗ボ−ルを原水と共に図１に示す
縦設置のモジュ−ルの原水供給口１７⇒原水流通用管15
1⇒原水供給孔１４⇒筒状ケ−ス１１内を通過させ、擦
洗ボ−ルを中空糸膜１２の外面に接触させ、擦洗ボ−ル
と膜表面との接触界面に剪断力を作用させ、膜表面の付
着スケ−ルを剥離・除去し、更に、濃縮原水流出口１９
を通過した擦洗ボ−ルを擦洗ボ−ル投入・回収器２３の
回収部232で回収していく。To clean the membrane module according to the invention, valves V 1 and V 5 are closed and valves V 2 , V 3 , V 6 and V 7 are opened,
Further, the valve V 4 is closed to circulate the whole amount of raw water, and a sponge-made scrubbing ball is thrown in from the charging section 231 of the scrubbing ball charging / recovering device 23, and this scrubbing ball is shown in FIG. Raw water supply port 17 for vertically installed module ⇒ Pipe for raw water distribution 15
1 ⇒ Raw water supply hole 14 ⇒ Pass through the cylindrical case 11 to bring the scrubbing ball into contact with the outer surface of the hollow fiber membrane 12 and apply a shearing force to the contact interface between the scrubbing ball and the membrane surface. , Removes and removes the adhesion scale on the membrane surface, and further concentrates the raw water outlet 19
The scrubbing ball that has passed through is collected by the collecting section 232 of the scrubbing ball charging / collecting device 23.
【００１８】この場合、擦洗ボ−ルと膜表面との接触界
面に作用する剪断力は擦洗ボ−ルが原水流れから受ける
力と当該擦洗ボ−ルに作用する浮力とに依存し、スポン
ジ製擦洗ボ−ルの発泡倍率を高くし、その比重を原水の
比重よりも小さくすることにより浮力を大きくでき、原
水流速を比較的低速としても優れた膜洗浄を保証でき
る。而して、原水流速を低速にでき、また、原水流れの
方向が中空糸膜束の固定端から自由端に向かう方向であ
るから、中空糸膜の動揺をよく抑制でき、膜の折損を回
避できる。In this case, the shearing force that acts on the contact interface between the scrubbing ball and the membrane surface depends on the force that the scrubbing ball receives from the raw water flow and the buoyancy that acts on the scrubbing ball. By increasing the expansion ratio of the scrubbing ball and making its specific gravity smaller than the specific gravity of the raw water, the buoyancy can be increased, and excellent membrane cleaning can be guaranteed even when the flow rate of the raw water is relatively low. Thus, the flow velocity of raw water can be reduced and the flow direction of raw water is from the fixed end to the free end of the bundle of hollow fiber membranes, so that the fluctuation of the hollow fiber membranes can be well suppressed and the membrane breakage can be avoided. it can.
【００１９】上記擦洗ボ−ルの直径は、通常、中空糸膜
の外径の１〜１０倍とされる。本発明の外圧式中空糸膜
モジュ−ルの洗浄方法は、貯蔵濾過水を使用しての逆
洗、エア−スクラビング法（但し、エア−量を通常の１
／２〜１／３程度と少なくする）等の洗浄方法との併用
で使用することもできる。The diameter of the scrubbing ball is usually 1 to 10 times the outer diameter of the hollow fiber membrane. The method for cleaning the external pressure type hollow fiber membrane module of the present invention includes backwashing using stored filtered water and an air-scrubbing method (however, the amount of air is usually 1
/ 2 to about 1/3).
【００２０】本発明によれば、次の実施例と比較例との
比較からも明らかなように、擦洗ボ−ル流動時の原水流
速を原水濾過時での通常の流速程度としても、エア−ス
クラビング法より優れた効率で膜洗浄できる。According to the present invention, as is clear from the comparison between the following Examples and Comparative Examples, even if the flow rate of raw water during the flow of the scrubbing ball is set to the normal flow rate during filtration of the raw water, Membrane cleaning can be performed with higher efficiency than the scrubbing method.
【００２１】実施例 外圧式中空糸膜モジュ−ルには、図１に示すモジュ−ル
であって、筒状ケ−ス内径が１２５ｍｍφ，筒状ケ−ス
長さが１０７７ｍｍ，中空糸膜が多孔質ポリスルホン膜
で平均孔径が０．１μｍ，中空糸膜の内径が１．２ｍ
ｍ，外径が２．０ｍｍ，中空糸膜本数が１０００本のも
のを使用した。膜分離装置には、図２に示すものを用
い、原水には河川水（濁度，１〜１０度）を使用し、通
常の運転時でのモジュ−ル内での原水流速をほぼ０．５
ｍ／ｓとした。擦洗ボ−ルには、ウレタンフォ−ム製の
平均直径が４ｍｍのものを使用した。上記のモジュ−ル
内原水流速をほぼ維持して、原水を全量循環させ、擦洗
ボ−ルによる洗浄を１回／１日、通常の逆洗を１回／１
時間の頻度で行ったところ、モジュ−ルの濾過水量保持
率は図３の（イ）の通りであった。EXAMPLE An external pressure type hollow fiber membrane module is the module shown in FIG. Porous polysulfone membrane with an average pore diameter of 0.1 μm and hollow fiber membrane with an inner diameter of 1.2 m
m, the outer diameter was 2.0 mm, and the number of hollow fiber membranes was 1000. The membrane separation device shown in FIG. 2 was used, river water (turbidity, 1 to 10 degrees) was used as raw water, and the flow rate of raw water in the module during normal operation was approximately 0. 5
m / s. The scrubbing ball was made of urethane foam and had an average diameter of 4 mm. While maintaining the flow rate of raw water in the module as described above, the whole amount of raw water was circulated, washing with a scrubbing ball was carried out once a day, and ordinary backwashing was carried out once a day.
When carried out at a frequency of time, the retention rate of the filtered water amount of the module was as shown in FIG.
【００２２】比較例 使用した外圧式中空糸膜モジュ−ル，膜分離装置並びに
通常時の運転条件を実施例と同じにし、通常のエア−ス
クラビング洗浄を１回／１日，通常の逆洗を１回／１時
間の頻度で行ったところ、モジュ−ルの濾過水量保持率
は図３の（ロ）の通りであった。Comparative Example The external pressure type hollow fiber membrane module used, the membrane separation device, and the operating conditions under normal conditions were the same as those of the examples, and normal air-scrubbing cleaning was carried out once per day and normal backwashing. When the operation was performed once per hour, the retention rate of the filtered water amount of the module was as shown in (b) of FIG.
【００２３】[0023]
【発明の効果】本発明の外圧式中空糸膜モジュ−ルの洗
浄方法によれば、原水流速を原水濾過時の原水流速と同
程度にして、中空糸膜が他端自由状態である外圧式中空
糸膜モジュ−ルをエア−スクラビング法よりも高効率で
膜洗浄でき、膜洗浄時での中空糸膜の動揺を回避でき、
膜の折損、膜外表面孔の閉塞の畏れなく中空糸膜束を安
全に膜洗浄できる。According to the method of cleaning the external pressure type hollow fiber membrane module of the present invention, the raw water flow velocity is set to the same level as the raw water flow velocity during the raw water filtration, and the hollow fiber membrane is in the free state at the other end. The hollow fiber membrane module can wash the membrane with higher efficiency than the air-scrubbing method, and it is possible to avoid shaking of the hollow fiber membrane during the membrane washing.
The hollow fiber membrane bundle can be safely subjected to membrane cleaning without any breakage of the membrane or blockage of pores on the outer surface of the membrane.
【図１】本発明の洗浄対象である外圧式中空糸膜モジュ
−ルの一例を示す説明図である。FIG. 1 is an explanatory view showing an example of an external pressure type hollow fiber membrane module to be cleaned according to the present invention.
【図２】本発明において使用する膜分離装置の一例を示
す説明図である。FIG. 2 is an explanatory diagram showing an example of a membrane separation device used in the present invention.
【図３】本発明の実施例と比較例との洗浄効果を示す図
表である。FIG. 3 is a table showing cleaning effects of an example of the present invention and a comparative example.
１１ 筒状ケ−ス １２ 中空糸膜束 １７ 原水供給口 １８ 濾過水取出口 １９ 濃縮原水流出口 Ａ 外圧式中空糸膜モジユ−ル ２３ 擦洗ボ−ル投入・回収器 11 Cylindrical Case 12 Hollow Fiber Membrane Bundle 17 Raw Water Supply Port 18 Filtered Water Outlet 19 Concentrated Raw Water Outlet A External Pressure Type Hollow Fiber Membrane Module 23 Scrubbing Ball Charger / Recoverer
Claims (3)
由状態とした外圧式中空糸膜モジュ−ルに原液を供給し
て濾過する途中において、スポンジ製の擦洗ボ−ルを原
水に投入し、該擦洗ボ−ルを原水と共に上記モジュ−ル
内の原水通路に通過させることを特徴とする外圧式中空
糸膜モジュ−ルの洗浄方法。1. A scrubbing ball made of a sponge is provided during the process of supplying and filtering a stock solution to an external pressure type hollow fiber membrane module in which one end of a hollow fiber membrane bundle is fixedly supported and the other end is in a free state. A method for cleaning an external pressure type hollow fiber membrane module, which comprises throwing the scrubbing ball into raw water and passing the scrubbing ball together with the raw water through a raw water passage in the module.
過させる方向が、中空糸膜束の片端から他端に向かう方
向である請求項１記載の外圧式中空糸膜モジュ−ルの洗
浄方法。2. The external pressure type hollow fiber membrane module according to claim 1, wherein the direction of passing the scrubbing ball through the raw water passage in the module is from one end of the hollow fiber membrane bundle to the other end. Cleaning method.
１０倍である請求項１または請求項２記載の外圧式中空
糸膜モジュ−ルの洗浄方法。3. The diameter of the scrubbing ball is 1 to the outer diameter of the hollow fiber membrane.
The cleaning method for an external pressure type hollow fiber membrane module according to claim 1 or 2, wherein the cleaning amount is 10 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4353132A JPH06178921A (en) | 1992-12-12 | 1992-12-12 | Method for cleaning external pressure type hollow fiber membrane module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4353132A JPH06178921A (en) | 1992-12-12 | 1992-12-12 | Method for cleaning external pressure type hollow fiber membrane module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06178921A true JPH06178921A (en) | 1994-06-28 |
Family
ID=18428779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4353132A Pending JPH06178921A (en) | 1992-12-12 | 1992-12-12 | Method for cleaning external pressure type hollow fiber membrane module |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06178921A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1382377A1 (en) * | 2002-07-15 | 2004-01-21 | TUCHENHAGEN GmbH | Joint filtering and filter cleaning |
-
1992
- 1992-12-12 JP JP4353132A patent/JPH06178921A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1382377A1 (en) * | 2002-07-15 | 2004-01-21 | TUCHENHAGEN GmbH | Joint filtering and filter cleaning |
| WO2004007059A1 (en) * | 2002-07-15 | 2004-01-22 | Tuchenhagen Gmbh | Joint filtering and filter cleaning |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3302992B2 (en) | Concentration of solids in suspension using hollow fiber membranes | |
| US4935143A (en) | Cleaning of filters | |
| JP3704544B2 (en) | Cleaning of hollow fiber membranes | |
| US4547286A (en) | Water filtration process and apparatus having upflow filter with buoyant filter media and downflow filter with nonbuoyant filter media | |
| US6214231B1 (en) | System for operation of multiple membrane filtration assemblies | |
| JPH07185268A (en) | Hollow fiber filter membrane element and module | |
| JP2008525167A (en) | Simple gas cleaning method and apparatus in the technical field | |
| JP2000317276A (en) | Filtering device | |
| JPH11156166A (en) | Cleaning method for hollow fiber membrane module | |
| WO2001066238A1 (en) | Method of producing purified water | |
| JPH07289860A (en) | Cleaning method of hollow fiber membrane module | |
| JP2721787B2 (en) | Backwashing method for hollow fiber membrane module | |
| JP3091015B2 (en) | Membrane separation device | |
| JPH0276633A (en) | Working liquid preparation device for electrocorrosion machine | |
| JPH06292820A (en) | Membrane separation device | |
| JP3984145B2 (en) | Cleaning method for solid-liquid separator | |
| JP3615918B2 (en) | Method and apparatus for cleaning reverse osmosis membrane module | |
| JP3376733B2 (en) | Hollow fiber membrane module | |
| JPH06170178A (en) | Hollow fiber membrane module filtration equipment | |
| JPH06178921A (en) | Method for cleaning external pressure type hollow fiber membrane module | |
| JPH09131517A (en) | Hollow fiber membrane module and method for using the same | |
| AU2005311248B2 (en) | Filtering system for water and waste water | |
| JP3371767B2 (en) | Operating method of membrane deaerator and membrane deaerator | |
| JP2000084377A (en) | Removal of membrane contaminated substance for tubular membrane device | |
| JPH1024221A (en) | Gas-liquid separator |