JPH0398608A - Cross flow filtering - Google Patents
Cross flow filteringInfo
- Publication number
- JPH0398608A JPH0398608A JP1235141A JP23514189A JPH0398608A JP H0398608 A JPH0398608 A JP H0398608A JP 1235141 A JP1235141 A JP 1235141A JP 23514189 A JP23514189 A JP 23514189A JP H0398608 A JPH0398608 A JP H0398608A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- filtrate
- fluid
- liquid
- filters
- 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
- 238000001914 filtration Methods 0.000 title description 24
- 239000000706 filtrate Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims description 34
- 238000009295 crossflow filtration Methods 0.000 claims description 19
- 238000005406 washing Methods 0.000 abstract 1
- 238000011001 backwashing Methods 0.000 description 13
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 239000004278 EU approved seasoning Substances 0.000 description 1
- 235000013334 alcoholic beverage Nutrition 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000012531 culture fluid Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000011194 food seasoning agent Nutrition 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
- 235000014101 wine Nutrition 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はクロスフロー濾過方法に関する．（従来技術）
クロスフロー濾過は被処理流体をフィルターの一側に沿
って流動させながら濾過するとともに、フィルタ表面の
堆積ケークを前記流体の平行流による剪断力にて最小の
厚みに保ち、前記流体の濾過を長時間維持するものであ
る．かかるクロスフロー濾過は被処理流体中に懸濁して
いる数１０Ａ〜数１０μｍという微粒子の分離に適し、
例えば食品分野における各種飲料水、調味料等の仕上げ
濾過、化学分野における各種プロセス液精製濾過、生化
学分野におけるバイオ液、培養液の精製濾過、菌体濃縮
等各種の分野で利用されている．しかして、一般にクロ
スフロー濾過としては、被処理流体を所定の圧力例えば
２ １ｇｆ／ｃｍ２にて濾過器へ連続的に供給して同濾
過器内のフィルタの一側に沿って流動させ、前記流体の
一部を前記フィルタの他側へ透過させて濾液として流出
させるとともに、前記流体の残液を前記濾過器へ循環供
給させる方法が実施されている。また、ががる方法を実
施するクロスフロー濾過装置の一例が第３図に示されて
おり、クロスフロー濾過においても濾過速度を長時間高
いレベルに維持すべくフィルタを間欠的に逆洗する方法
が採られている。当該クロスフロー濾過装置においては
、逆洗手段が濾過器１１、１２、１３におけるフィルタ
の他側に連通ずる流出管路１４および流入管路１５間に
配設した濾液タンク１６、流入管路１５内に配設した逆
洗ボンブ１７にて構或されて、被処理流体の供給中また
は供給を一旦停止した状態で逆洗ボンプ１７を駆動させ
て濾液をフィルタのタンク側へ供給し、同フィルタを逆
洗するものである。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a cross-flow filtration method. (Prior art) In cross-flow filtration, the fluid to be treated is filtered while flowing along one side of the filter, and the deposited cake on the filter surface is kept at a minimum thickness by the shearing force caused by the parallel flow of the fluid. It maintains filtration for a long time. Such cross-flow filtration is suitable for separating fine particles of several tens of amperes to several tens of micrometers suspended in the fluid to be treated.
For example, it is used in various fields such as finishing filtration of various drinking water and seasonings in the food field, purification filtration of various process liquids in the chemical field, purification filtration of bio fluids and culture fluids in the biochemistry field, and bacterial cell concentration. Generally, in cross-flow filtration, the fluid to be treated is continuously supplied to a filter at a predetermined pressure, for example, 21 gf/cm2, and is caused to flow along one side of the filter in the filter. A method has been implemented in which a portion of the fluid is allowed to pass through the other side of the filter and flow out as a filtrate, and the remaining fluid is circulated and supplied to the filter. In addition, an example of a cross-flow filtration device that implements the Gagaru method is shown in Figure 3. Even in cross-flow filtration, the filter is intermittently backwashed in order to maintain the filtration rate at a high level for a long time. is taken. In this cross-flow filtration device, a backwashing means is provided in a filtrate tank 16 disposed between an outflow pipe 14 and an inflow pipe 15 that communicate with the other side of the filter in the filters 11, 12, and 13, and in the inflow pipe 15. The backwashing bomb 17 is configured with a backwashing bomb 17 disposed in the tank, and the backwashing bomb 17 is driven to supply the filtrate to the tank side of the filter while the fluid to be treated is being supplied or once the supply has been stopped, and the filter is It is used for backwashing.
（発明が解決しようとする課題〉
このように、クロスフロー濾過においてフィルタの逆洗
を行う場合には、上記した装置の逆洗手段のごとく逆洗
用の付帯設備が必要である。従って、本発明の目的はか
かるクロスフロー濾過において、逆洗用の付帯設備を使
用することなくフィルタの逆洗を行うことにある。(Problems to be Solved by the Invention) As described above, when backwashing a filter in cross-flow filtration, ancillary equipment for backwashing, such as the backwashing means of the device described above, is required. An object of the invention is to perform backwashing of the filter in such cross-flow filtration without using any auxiliary equipment for backwashing.
（課題を解決するための手段）
本発明は、被処理流体を所定の圧力にて濾過器へ連続的
に供給して同濾過器内のフィルタの一側に沿って流動さ
せ、前記流体の一部を前記フィルタの他側へ透過させて
濾液として前記流体の供給圧力より低い所定の圧力にて
次工程へ供給するとともに、前記流体の残液を前記濾過
器へ循環供給させるクロスフロー濾過方法であり、前記
流体の供給を所定時間間欠的に停止させることを特徴と
するものである。(Means for Solving the Problems) The present invention provides a method for continuously supplying a fluid to be treated to a filter at a predetermined pressure and causing the fluid to flow along one side of a filter in the filter. A cross-flow filtration method in which a part of the fluid is passed through the other side of the filter and supplied as a filtrate to the next step at a predetermined pressure lower than the supply pressure of the fluid, and the residual liquid of the fluid is circulated and supplied to the filter. The method is characterized in that the supply of the fluid is intermittently stopped for a predetermined period of time.
（発明の作用・効果〉
かかるクロスフロー濾過方法によれば、被処理流体の一
部が連続してフィルタを透過して’ａｍとして所定の圧
力にて次工程へ供給され、この間前記流体が所定時間間
欠的に停止されると、フィルタにおける一側の流体の圧
力よりも他側の濾液の圧力が高くなって濾液がフィルタ
の他側から一側へ逆流する。これにより、フィルタの一
側に堆積しているケークが除去され、ケーク層に起因す
る濾過速度の低下が解消される。従って、かかるクロス
フロー濾過方法を採用すれば、既存の流体供給停止手段
を使用しまたはそれ自体新設の停止手段を使用すること
によりフィルタの逆洗が可能であり、従来のごとく逆洗
用の付帯設備が不要となる。(Actions and Effects of the Invention) According to this cross-flow filtration method, a part of the fluid to be treated continuously passes through the filter and is supplied as 'am' to the next step at a predetermined pressure, during which time the fluid is kept at a predetermined pressure. When stopped intermittently, the pressure of the fluid on one side of the filter becomes higher than the pressure of the filtrate on the other side, causing the filtrate to flow back from the other side of the filter to the one side. The built-up cake is removed and the reduction in filtration rate caused by the cake layer is eliminated.The adoption of such a cross-flow filtration method therefore eliminates the need to use existing fluid supply shut-off means or to install a new shut-off itself. By using this means, the filter can be backwashed, and there is no need for ancillary equipment for backwashing as in the past.
（実施例）
以下本発明を第１図および第２図に基づいて説明するに
、第１図には本発明の第１実施例に係る濾過方法を実施
するのに好適なクロスフロー濾過装置２０ａが示されて
いる。当該濾過装置２０ａはワイン、酒類、食酢、ダシ
汁等を被処理流体として同流体中から除菌するもので、
除菌された濾液を次工程である充填機２０ｂに供給して
ビン、缶等に充填する。従って、当該濾過装置２０ａは
充填機２０ｂに連結されている。(Example) The present invention will be described below based on FIG. 1 and FIG. 2. FIG. It is shown. The filtration device 20a is used to remove bacteria from wine, alcoholic beverages, vinegar, soup stock, etc., as a fluid to be treated.
The sterilized filtrate is supplied to the filling machine 20b, which is the next step, and is filled into bottles, cans, etc. Therefore, the filtering device 20a is connected to the filling machine 20b.
しかして、濾過装置２０ａは循環タンク２１、循環ボン
ブ２２および３つの濾過器２３〜２５を備え、これらの
５者２１〜２５は直列状態で循環管路にて連結されてい
る。各濾過器２３〜２５は公知のクロスフロー濾過器で
あり、ケーシング２３ａ〜２５ａ内に筒状のセラミック
フィルタ２３ｂ〜２５ｂが収容されていて、循環ボンブ
２２の駆動により循環タンク２１内の被処理流体が第ｌ
濾過器２３のフィルタ２３ｂの内周に沿って長手方向に
流動し、次いで第２濾過器２４のフィルタ２４ｂの内周
に沿って流動し、最後に第３濾過器２５のフィルタ２５
ｂの内周に沿って流動して循環タンク２１へ還流する．
被処理流体の循環ボンプ２２による供給圧力は４ ｋｇ
ｆ／ａｍ２であり、被処理流体の一部は上記した循環中
に各フィルタ２３ｂ〜２５ｂの外周測に透過し、濾液と
して流出管路２６から流出する。この流出管路２６は充
填機２０ｂの貯留タンク２７に連結されていて、流出管
路２６には電磁開閉弁２６ａが介装されている。The filtration device 20a includes a circulation tank 21, a circulation bomb 22, and three filters 23-25, and these five filters 21-25 are connected in series through a circulation pipe. Each of the filters 23 to 25 is a known cross-flow filter, in which cylindrical ceramic filters 23b to 25b are housed in casings 23a to 25a, and the to-be-treated fluid in the circulation tank 21 is driven by the circulation bomb 22. is the lth
It flows longitudinally along the inner periphery of the filter 23b of the filter 23, then flows along the inner periphery of the filter 24b of the second filter 24, and finally flows along the inner periphery of the filter 24b of the third filter 25.
It flows along the inner circumference of b and returns to the circulation tank 21.
The supply pressure of the fluid to be treated by the circulation pump 22 is 4 kg.
f/am2, and a portion of the fluid to be treated passes through the circumference of each of the filters 23b to 25b during the above-mentioned circulation, and flows out from the outflow pipe 26 as a filtrate. This outflow pipe 26 is connected to a storage tank 27 of the filling machine 20b, and an electromagnetic on-off valve 26a is interposed in the outflow pipe 26.
充填機２０ｂそれ自体は公知のもので、貯留タンク２７
は常時２ ｋｇｆ／ｃｍ２の内圧に保持されており、か
かる内圧により貯留タンク２７内の濾液がビン等に充填
される構成になっている。従って、濾過装置２０ａにお
いては濾液側に２ ｋｇｆ／ａｍ２の圧力が付与されて
おり、被処理流体の供給圧力４ｋｇｆ／ａｍ２との差圧
の下でクロスフロー濾過がなされる。The filling machine 20b itself is a known one, and the storage tank 27
is always maintained at an internal pressure of 2 kgf/cm2, and the filtrate in the storage tank 27 is filled into a bottle or the like by this internal pressure. Therefore, in the filtration device 20a, a pressure of 2 kgf/am2 is applied to the filtrate side, and cross-flow filtration is performed under a pressure difference between the supply pressure of the fluid to be treated and the supply pressure of 4 kgf/am2.
貯留タンク２７内の濾液量は循環ボンブ２２の駆動制御
により調整されるもので、同タンク２７には濾液が設定
された最高のレベルに上昇したこと、および最低のレベ
ルに下降したことを検出してコントローラ２８に検出信
号を送る一対のレベルセンサを備えている。コントロー
ラ２８はハイレベルセンサの検出信号に基づき循環ボン
ブ２２の駆動を停止させるとともに、タイマにて設定さ
れた時間遅れて開閉弁２６ａを閉成させ、かつロウレベ
ルセンサの検出信号に基づき循環ボンプ２２の駆動を開
始させると同時に開閉弁２６ａを開成させる。The amount of filtrate in the storage tank 27 is adjusted by drive control of the circulation bomb 22, and the tank 27 has a device that detects when the filtrate has risen to a set maximum level and when it has fallen to a set minimum level. The controller 28 includes a pair of level sensors that send detection signals to the controller 28. The controller 28 stops driving the circulation bomb 22 based on the detection signal from the high level sensor, closes the on-off valve 26a after a time delay set by the timer, and starts the circulation bomb 22 based on the detection signal from the low level sensor. At the same time as starting the drive, the on-off valve 26a is opened.
従って、当該濾過装置２０ａにおいて循環ボンプ２２は
充填機２０ｂの貯留タンク２７内の濾液が設定された最
高のレベルに上昇するまで駆動して停止し、かつ濾液が
充填されてレベルが下降して設定された最低レベルに下
降するまで停止状態を保持し、その後濾液が最低レベル
に下降した時点で再び駆動を開始する。循環ボンプ２２
の駆動が停止している間被処理流体の供給圧力は零とな
り、ポンプ駆動時とは逆に濾液側が高圧となる差圧が生
じて濾液が逆流し各フィルタ２３ｂ〜２５ｂを内周側へ
透過する。これにより、濾液は各フィルタ２３ｂ〜２５
ｂの内周測に堆積しているケークを剥離し、各フィルタ
２３ｂ〜２５ｂを逆洗する。Therefore, in the filtration device 20a, the circulation pump 22 is driven until the filtrate in the storage tank 27 of the filling machine 20b rises to the highest set level, and then stops, and when the filtrate is filled, the level decreases to the set level. The stopped state is maintained until the filtrate drops to the lowest level, and then the drive is started again when the filtrate drops to the lowest level. Circulation pump 22
While the drive of the pump is stopped, the supply pressure of the fluid to be treated becomes zero, and a pressure difference is created in which the filtrate side becomes high pressure, contrary to when the pump is driven, and the filtrate flows back and passes through each filter 23b to 25b to the inner peripheral side. do. As a result, the filtrate is transferred to each of the filters 23b to 25.
The cake accumulated on the inner circumference of b is peeled off, and each filter 23b to 25b is backwashed.
このように、本実施例の濾過方法によれば循環ポンブ２
２を間欠的に停止させるのみで、次工程へ供給する濾液
の供給圧力を有効に利用することにより各フィルタ２３
ｂ〜２５ｂを逆洗することができ、従来のごとく逆洗用
の付帯設備を特別に設置することが不要である．
なお、本発明の濾過方法は、濾液が供給される次工程が
濾液の充填工程のみならず濾液が所定の圧力で供給され
る各種の工程に対しても採用されるものであり、また循
環ポンプを停止して濾液側の圧力を利用して逆洗を行う
ものであることから、循環ポンプの停止手段として一定
時間毎に循環ボンブを一定時間停止させる任意の手段を
採用することができる．
第２図には本発明の第２実施例に係る濾過方法を実施す
るのに好適なクロスフロー濾過装置２０Ｃが示されてい
る。当該濾過装置２０ｃにおいては被処理流体の循環管
路２９ａにバイパス管路２９ｂを備えている点、および
これら両管路２９ａ、２９ｂに電磁開閉弁２９ｃ、２９
ｄを備えている点で第１図に示す濾過装置２０ａとは相
違する．当該濾過装置２０ｃを使用する第２実施例の濾
過方法においては、第１実施例の濾過方法と同様被処理
流体の供給圧力を４ ｋｇｆ／ｃｍ２とされるが、貯留
タンク２７内の濾液量は両管路２９ａ、２９ｂに介装し
た開閉弁２９ｃ、２９ｄの開閉制御により調整される。In this way, according to the filtration method of this embodiment, the circulation pump 2
By only intermittently stopping the filters 23 and 23, the pressure of the filtrate supplied to the next process can be effectively utilized.
b to 25b can be backwashed, and there is no need to install special equipment for backwashing as in the past. Note that the filtration method of the present invention is applicable not only to the filtrate filling process but also to various processes in which the filtrate is supplied at a predetermined pressure, and the next step in which the filtrate is supplied is a circulation pump. Since the system uses pressure on the filtrate side to perform backwashing by stopping the filtrate, any means for stopping the circulation bomb for a certain period of time at certain intervals can be used as the means for stopping the circulation pump. FIG. 2 shows a cross-flow filtration device 20C suitable for carrying out the filtration method according to the second embodiment of the present invention. The filtration device 20c has a bypass pipe 29b in the circulation pipe 29a for the fluid to be treated, and electromagnetic on-off valves 29c, 29 are provided in both pipes 29a, 29b.
The filter device 20a is different from the filter device 20a shown in FIG. In the filtration method of the second embodiment using the filtration device 20c, the supply pressure of the fluid to be treated is 4 kgf/cm2 as in the filtration method of the first embodiment, but the amount of filtrate in the storage tank 27 is It is adjusted by opening and closing control of on-off valves 29c and 29d installed in both pipes 29a and 29b.
当該濾過装’ｆ！ｌ ２ ０ ｃの始動時流出管路２６
の開閉弁２６ａおよび循環管路２９ａの開閉弁２９ｃは
開成され、かつバイパス管路２つｂの開閉弁２９ｄは閉
成されていて、循環タンク２１内の被処理流体は循環ボ
ンブ２２の駆動により各濾過器２３〜２５を通って循環
され、その一部が濾液として流出管路２６を通って貯留
タンク２７内へ流出する。この間貯留タンク２７内の濾
液が最高のレベルに上昇すると、コントローラ２８はハ
イレベルセンサの検出信号に基づき循環管路２９ａの開
閉弁２９ｃを閉戒させるとともに同時にバイパス管路２
９ｂの開閉弁２９ｄを開成させ、かつタイマにて設定さ
れた時間遅れて開閉弁２６ａを閉成させる．また、貯留
タンク２７内の濾液が最低のレベルに下降すると、コン
トローラ２８はロウレベルセンサの検出信号に基づきバ
イパス管路２９ｂの開閉弁２９ｄを閉成させるとともに
、同時に循環管路２９ａの開閉弁２９ｃおよび流出管路
２６の開閉弁２６ａを開成させる。The filtration device'f! Outflow pipe 26 at startup of l20c
The on-off valve 26a and the on-off valve 29c of the circulation pipe 29a are opened, and the on-off valve 29d of the two bypass pipes b is closed, and the fluid to be treated in the circulation tank 21 is driven by the circulation bomb 22. It is circulated through each of the filters 23 to 25, and a portion thereof flows out as a filtrate through an outflow line 26 into a storage tank 27. During this period, when the filtrate in the storage tank 27 rises to the highest level, the controller 28 closes the on-off valve 29c of the circulation pipe 29a based on the detection signal of the high level sensor, and at the same time closes the on-off valve 29c of the circulation pipe 29a.
The on-off valve 29d of 9b is opened, and the on-off valve 26a is closed after a delay set by the timer. Further, when the filtrate in the storage tank 27 drops to the lowest level, the controller 28 closes the on-off valve 29d of the bypass line 29b based on the detection signal of the low level sensor, and simultaneously closes the on-off valve 29c of the circulation line 29a and The on-off valve 26a of the outflow pipe line 26 is opened.
従って、当該濾過装置２０ｃを採用すれば、循環ボンブ
２２を停止させることなく、各濾過器２３〜２５に対す
る被処理流体の供給を間欠的に停止させることができ、
この供給停止により各フィルタが逆洗される。Therefore, by employing the filtration device 20c, it is possible to intermittently stop the supply of the fluid to be treated to each of the filters 23 to 25 without stopping the circulation bomb 22.
This supply stop causes each filter to be backwashed.
第１図は本発明の第１実施例に係る濾過方法を実施する
ためのクロスフロー濾過装置の概略構成図、第２図は第
２実施例に係る濾過方法を実施するためのクロスフロー
濾過装置の概略構成図、第３図は従来方法を実施するた
めのクロスフロー濾過装置の概略構成図である．
符 号 の 説 明
１０、２０ａ、２０ｃ・−−濾過装置、２０ｂ・・充填
機、２１・・・循環タンク、２２・循環ポンプ、１１〜
１３、２３〜２５・・・濾過器、１６・・・濾液タンク
、１７・・・逆洗ボンブ、２６・−−流出管路、２６ａ
、２９ｃ、２９ｄ・・・開閉弁、２７・・・貯留タンク
、２９ａ・循環管路、２９ｂ・・・バイパス管路。FIG. 1 is a schematic configuration diagram of a cross-flow filtration device for implementing the filtration method according to the first embodiment of the present invention, and FIG. 2 is a cross-flow filtration device for implementing the filtration method according to the second embodiment. Figure 3 is a schematic diagram of a cross-flow filtration device for carrying out the conventional method. Explanation of symbols 10, 20a, 20c---Filtering device, 20b...Filling machine, 21...Circulation tank, 22.Circulation pump, 11~
13, 23-25... Filter, 16... Filtrate tank, 17... Backwash bomb, 26... Outflow pipe, 26a
, 29c, 29d...Opening/closing valve, 27...Storage tank, 29a/Circulation pipe line, 29b...Bypass pipe line.
Claims (1)
同濾過器内のフィルタの一側に沿って流動させ、前記流
体の一部を前記フィルタの他側へ透過させて濾液として
前記流体の供給圧力より低い所定の圧力にて次工程へ供
給するとともに、前記流体の残液を前記濾過器へ循環供
給させるクロスフロー濾過方法であり、前記流体の供給
を所定時間間欠的に停止させることを特徴とするクロス
フロー濾過方法。A fluid to be treated is continuously supplied to a filter at a predetermined pressure to flow along one side of the filter in the filter, and a part of the fluid is transmitted to the other side of the filter as a filtrate. This is a cross-flow filtration method in which the fluid is supplied to the next step at a predetermined pressure lower than the supply pressure of the fluid, and the residual liquid of the fluid is circulated and supplied to the filter, and the supply of the fluid is intermittently stopped for a predetermined period of time. A cross-flow filtration method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1235141A JP2506455B2 (en) | 1989-09-11 | 1989-09-11 | Cross flow filtration method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1235141A JP2506455B2 (en) | 1989-09-11 | 1989-09-11 | Cross flow filtration method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0398608A true JPH0398608A (en) | 1991-04-24 |
| JP2506455B2 JP2506455B2 (en) | 1996-06-12 |
Family
ID=16981661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1235141A Expired - Lifetime JP2506455B2 (en) | 1989-09-11 | 1989-09-11 | Cross flow filtration method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2506455B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6116404A (en) * | 1984-06-30 | 1986-01-24 | 岩崎電気株式会社 | Fluorescent lamp illuminator |
| JPS62234514A (en) * | 1986-04-01 | 1987-10-14 | Kurita Water Ind Ltd | Back washing method for filter device |
| JPH02265628A (en) * | 1989-04-05 | 1990-10-30 | Kurita Water Ind Ltd | Membranous separating process |
-
1989
- 1989-09-11 JP JP1235141A patent/JP2506455B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6116404A (en) * | 1984-06-30 | 1986-01-24 | 岩崎電気株式会社 | Fluorescent lamp illuminator |
| JPS62234514A (en) * | 1986-04-01 | 1987-10-14 | Kurita Water Ind Ltd | Back washing method for filter device |
| JPH02265628A (en) * | 1989-04-05 | 1990-10-30 | Kurita Water Ind Ltd | Membranous separating process |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2506455B2 (en) | 1996-06-12 |
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