JPH0760197B2 - Backwashing method for hollow fiber membrane filters - Google Patents

Backwashing method for hollow fiber membrane filters

Info

Publication number
JPH0760197B2
JPH0760197B2 JP18025488A JP18025488A JPH0760197B2 JP H0760197 B2 JPH0760197 B2 JP H0760197B2 JP 18025488 A JP18025488 A JP 18025488A JP 18025488 A JP18025488 A JP 18025488A JP H0760197 B2 JPH0760197 B2 JP H0760197B2
Authority
JP
Japan
Prior art keywords
valve
hollow fiber
fiber membrane
water inlet
main body
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.)
Expired - Lifetime
Application number
JP18025488A
Other languages
Japanese (ja)
Other versions
JPH0231200A (en
Inventor
真策 丸山
隆夫 猪野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebara Corp
Original Assignee
Ebara Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ebara Corp filed Critical Ebara Corp
Priority to JP18025488A priority Critical patent/JPH0760197B2/en
Publication of JPH0231200A publication Critical patent/JPH0231200A/en
Publication of JPH0760197B2 publication Critical patent/JPH0760197B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、原子力発電所等で発生する放射性廃液或は原
子炉における復水の中空糸膜を用いる過方法に関し、
特に過工程における中空糸膜フイルタの逆洗方法に関
する。
The present invention relates to a method of using a radioactive waste liquid generated in a nuclear power plant or the like or a condensate hollow fiber membrane in a nuclear reactor.
In particular, it relates to a method for backwashing a hollow fiber membrane filter in an overstep.

〔従来の技術〕[Conventional technology]

従来、放射性廃液或いは復水から懸濁物質を除去する場
合、プリコートタイプのフイルタが使用されている。
Conventionally, a precoat type filter has been used to remove suspended substances from radioactive waste liquid or condensate.

このプリコートタイプのフイルタを用いる場合、フイル
タの目詰まりが生じて差圧が一定値以上(例えば1.5〜2
kg/cm2以上)に達した時点で逆洗を行つているが、逆洗
廃液中にはフイルタで捕捉された懸濁物質以外に、プリ
コート材自体も二次廃棄物として混入されるため、廃棄
物量が多くなり、廃棄物管理飢好ましいものではなかつ
た。
When this precoat type filter is used, the filter is clogged and the differential pressure exceeds a certain value (eg 1.5-2
backwashing is performed when it reaches (kg / cm 2 or more), but in the backwash waste liquid, in addition to the suspended substances captured by the filter, the precoat material itself is mixed as secondary waste, Due to the large amount of waste, the waste management famine was not favorable.

近年、このような問題点を解決するために、二次廃棄物
の発生量が極めて少ない中空糸膜フイルタを使用して
過する方法が採用されて来ている。
In recent years, in order to solve such problems, a method of using a hollow fiber membrane filter in which the amount of secondary waste is extremely small has been adopted.

〔発明が解決しようとする課題〕[Problems to be Solved by the Invention]

中空糸膜フイルタを用いて過する場合、中空糸膜外面
で懸濁物質を過し、懸濁物質の付着量が多くなり差圧
が一定の差圧となつた場合、或いは所定の差圧上昇度に
達した場合に逆洗を行なうが、この逆洗により膜面の汚
れの進行を極力抑える必要があり、そのために種々の方
法が試みられているが、いまだ満足する方法が確立して
いない。
When using a hollow fiber membrane filter, when the suspended substance is passed on the outer surface of the hollow fiber membrane and the amount of suspended substance adhered increases and the differential pressure becomes a constant differential pressure, or a predetermined differential pressure rise When it reaches a certain level, backwashing is performed, but it is necessary to suppress the progress of dirt on the membrane surface by this backwashing as much as possible, and various methods have been tried for that purpose, but a satisfactory method has not yet been established. .

また、膜面の汚れが著しいと中空糸膜自身が再生不能と
なり廃棄処分しなければならなくなるため、廃棄物の低
減という観点及び経済性からも好ましくなく、逆洗によ
り中空糸膜フイルタを再生し、如何に長時間の使用に耐
えるかが課題となつていた。
In addition, if the membrane surface is significantly soiled, the hollow fiber membrane itself cannot be regenerated and must be disposed of, which is not preferable from the viewpoint of waste reduction and economy, and the hollow fiber membrane filter is regenerated by backwashing. However, how to withstand long-term use has been an issue.

本発明者らは、先に「中空糸膜フイルタの逆洗方法」
(特願昭61−272834号)とする関連特許を出願している
が、この出願に比較し、本発明では、工程9にみられる
ように管板下の液張り時にもスクラビングを行ない、泡
が気液界面ではじけるときの力を利用した懸濁物質はく
り効果をねらつている点で大きな違いがある。
The present inventors have previously referred to "a method of backwashing a hollow fiber membrane filter".
(Japanese Patent Application No. 61-272834) has been filed, but in comparison with this application, in the present invention, scrubbing is performed even when liquid is filled under the tube sheet as shown in step 9, and bubbles are generated. There is a big difference in that the suspended substances that utilize the force when the bubbles pop at the gas-liquid interface are aimed at the creaking effect.

そして、本発明の目的は、中空糸膜の寿命を延ばすため
に、有効な逆洗方法を提供する点にある。
An object of the present invention is to provide an effective backwashing method for extending the life of the hollow fiber membrane.

〔課題を解決するための手段〕[Means for Solving the Problems]

本発明者らは、上記の目的を達成するために鋭意検討の
結果、水にぬれた状態では空気を通さない中空糸膜フイ
ルムを用いて、放射性廃液又は復水を中空糸膜の外側か
ら内側に通すことにより過する方法において、次の
(A)から(P)の工程を順次行うことによる中空糸膜
の逆洗方法を提供するものである。
As a result of earnest studies to achieve the above object, the present inventors have used a hollow fiber membrane film that does not allow air to pass through when it is wet, using radioactive hollow fiber or condensate from the outside to the inside of the hollow fiber membrane. The present invention provides a method for backwashing a hollow fiber membrane by sequentially performing the following steps (A) to (P) in the above method.

(A) 放射性廃液又は復水を中空糸膜過器11に供給
して過する工程(工程1)において、差圧が所定値に
達した後過を停止し(工程2)、ついで、本体胴ベン
ト弁5及び空気スクラビング弁8を開いて空気スクラビ
ング弁8より空気を導入し、所定時間空気スクラビング
を行なう工程(工程3) (B) 空気スクラビング弁8を閉じ、水入口弁7を開
いて水を導入して管板下まで液張りを行なう工程(工程
4) (C) 本体胴ベント弁5及び水入口弁7を閉じ、加圧
空気弁2及びドームドレン弁3を開いてドームドレンを
行なう工程(工程5) (D) ドームドレン弁3を閉じ、加圧空気により所定
圧力まで加圧を行なう工程(工程6) (E) 逆洗排出弁9を開き、上部胴中の水によりバン
プを行なう工程(工程7) (F) ついで、加圧空気弁2を閉じ、ベント弁1を開
き、本体胴ベント弁5を開とし、上部胴内を開放すると
ともに管板下の廃液を排出する工程(工程8) (G) ベント弁1を閉じ、逆洗排出弁9を閉じ、水入
口弁7を開き、空気スクラビング弁8を開とし、管板下
まで水位をあげる過程で空気スクラビングを行なう工程
(工程9) (H) 水入口弁7を閉とし、所定時間空気スクラビン
グを行なう工程(工程10) (I) 空気スクラビング弁8を閉じ、水入口弁7を開
いて管板下まで液張りを行なう工程(工程11) (J) ドームドレン弁3を開き、本体胴ベント弁5を
閉じ、ドームドレン口まで液張りする工程(工程12) (K) 水入口弁7、ドームドレン弁3を閉じ、加圧空
気弁2を開けて加圧空気により、所定圧力までドームの
加圧を行なう工程(工程13) (L) 逆洗排出弁9を開け、上部胴中の水によりバン
プを行なう工程(工程14) (M) ついで加圧空気弁2を閉じ、ベント弁1を開
き、本体胴ベント弁5を開とし、上部胴内を開放すると
ともに管板下の廃液を排出する工程(工程15) (N) ドームドレン弁3、逆洗排出弁9を閉じ、本体
胴ベント弁5及び水入口弁7を開け、管板下まで液張り
を行なう工程(工程16) (O) 本体胴ベント弁5を閉じ、上部胴をも液張りす
る工程(工程17) (P) 満水後水入口弁7、ベント弁1を閉じ停止状態
とする工程(工程18) 以上の工程を順次行うことにより中空糸膜が逆洗でき
る。
(A) In the step (step 1) of supplying the radioactive waste liquid or the condensate to the hollow fiber membrane filter 11 and passing the same, after the differential pressure reaches a predetermined value, the stop is stopped (step 2), and then the main body cylinder Step of opening vent valve 5 and air scrubbing valve 8 to introduce air from air scrubbing valve 8 and performing air scrubbing for a predetermined time (step 3) (B) Close air scrubbing valve 8 and open water inlet valve 7 (C) The main body cylinder vent valve 5 and the water inlet valve 7 are closed, and the pressurized air valve 2 and the dome drain valve 3 are opened to perform the dome drain. Step (Step 5) (D) Step of closing the dome drain valve 3 and pressurizing with pressurized air to a predetermined pressure (Step 6) (E) Opening the backwash discharge valve 9 and removing bumps by water in the upper body Steps to be performed (Step 7) (F) Next, pressurized air Step of closing the valve 2, opening the vent valve 1, opening the main body vent valve 5, opening the inside of the upper body and discharging the waste liquid under the tube sheet (step 8) (G) Close the vent valve 1 and reverse The process of performing air scrubbing in the process of raising the water level to the bottom of the tube sheet by closing the washing / discharging valve 9, opening the water inlet valve 7, and opening the air scrubbing valve 8 (step 9) (H) Closing the water inlet valve 7 A step of performing air scrubbing for a predetermined time (step 10) (I) a step of closing the air scrubbing valve 8 and opening the water inlet valve 7 to perform liquid filling under the tube sheet (step 11) (J) the dome drain valve 3 Step of opening and closing the main body vent valve 5 and filling liquid to the dome drain port (step 12) (K) Close the water inlet valve 7 and the dome drain valve 3, open the pressurized air valve 2 and pressurize the air. Step of pressing the dome to a predetermined pressure (step 13) (L ) Step of opening the backwash discharge valve 9 and bumping with water in the upper body (step 14) (M) Then, closing the pressurized air valve 2, opening the vent valve 1, opening the main body vent valve 5, Step of opening the upper cylinder and discharging the waste liquid under the tube plate (Step 15) (N) Close the dome drain valve 3 and the backwash discharge valve 9, open the main cylinder vent valve 5 and the water inlet valve 7, Step of performing liquid filling up to the bottom of the plate (step 16) (O) Step of closing the main body vent valve 5 and filling the upper body with liquid (step 17) (P) Closing water inlet valve 7 and vent valve 1 after full water Step of stopping (Step 18) The hollow fiber membrane can be backwashed by sequentially performing the above steps.

上記工程4において、管板10下の液張りを上部胴13のド
ーム水を用いて行なうことができる。すなわち、水入口
弁7を閉じ、加圧空気弁2、本体胴ベント弁5を開と
し、管板下を液張りするか、水入口弁7を閉じ、ベント
弁1、本体胴ベント弁5を開とし、管板下を液張りする
方法で行なうことができる。
In step 4 above, the liquid filling under the tube sheet 10 can be performed using the dome water of the upper body 13. That is, the water inlet valve 7 is closed, the pressurized air valve 2 and the main body vent valve 5 are opened and liquid is filled under the tube plate, or the water inlet valve 7 is closed and the vent valve 1 and the main body vent valve 5 are closed. It can be carried out by opening and filling the bottom of the tube plate with liquid.

また、上記の工程のみでは十分に逆洗できない場合は、
工程8と工程16の間に、工程9から工程15までの一連の
工程を1組とし、該一連の工程を2組以上設けることも
できる。
Also, if the above steps alone cannot be sufficiently backwashed,
It is also possible to set a series of steps 9 to 15 between the step 8 and the step 16 and to provide two or more sets of the series.

なお、本発明の逆洗方法を適用するのは、中空糸膜の外
面と内面の間に差圧が生じその値が一定の値以上となつ
た場合であるが、その値は当業者が適宜決定できるもの
であり、使用した中空糸膜フイルタの種類及び処理液の
性状によつても相違するが、通常は3kg/cm2位が標準で
ある。また、空気スクラビングは、あまり長時間行つて
も効果上差異は生じないから、通常は10〜20分で十分で
ある。そして、加圧空気によるドーム内の加圧は、中空
糸膜の種類によつても相違するが、あまり高圧では中空
糸膜フイルタに悪影響を及ぼすから、通常は2〜4kg/cm
2G位であり、常用の範囲で使用できる。
The backwashing method of the present invention is applied when a pressure difference occurs between the outer surface and the inner surface of the hollow fiber membrane and the value becomes a certain value or more, but the value is appropriately determined by those skilled in the art. It can be determined, and it is different depending on the type of the hollow fiber membrane filter used and the properties of the treatment liquid, but normally 3 kg / cm 2 is the standard. Also, air scrubbing does not make a difference even if it is performed for a long time, so 10 to 20 minutes is usually sufficient. The pressurization in the dome by the pressurized air differs depending on the type of the hollow fiber membranes, but if the pressure is too high, it will adversely affect the hollow fiber membrane filters.
It is about 2 G and can be used in the usual range.

以下に、本発明の作用、実施例を記載するが、配管の位
置、弁構成及び弁操作等は本発明の趣旨を逸脱しない範
囲において、設計上適宜変更できる。
The operation and examples of the present invention will be described below, but the position of the pipe, the valve configuration, the valve operation, etc. can be appropriately changed in design without departing from the spirit of the present invention.

〔作 用〕[Work]

本発明は、原子力発電所等で発生する放射性廃液或いは
原子炉における復水の処理において、放射性廃液又は復
水中に含有されている懸濁物を中空糸膜フイルタを用い
て過する際に、中空糸膜フイルタに懸濁物が付着し、
付着量が多くなると、中空糸膜の外面と内面の間に差圧
が生じ、この差圧が一定の値以上となつた場合、或い
は、差圧上昇度が一定の値以上となつた場合に、過を
停止して本発明方法による逆洗方法を行なうものであ
り、そうすることにより、中空糸膜の膜面の汚れの進行
を極力抑えることができ、中空糸膜の寿命を延ばすこと
ができるものである。
The present invention, in the treatment of radioactive waste liquid generated in a nuclear power plant or the like, or condensate in a nuclear reactor, when the radioactive waste liquid or the suspension contained in the condensate is passed using a hollow fiber membrane filter, it is hollow. Suspension adhered to the thread film filter,
When the adhered amount increases, a differential pressure is generated between the outer surface and the inner surface of the hollow fiber membrane, and when the differential pressure becomes a certain value or more, or when the differential pressure increase degree becomes a certain value or more. By stopping the excess, the backwashing method according to the method of the present invention is performed, and by doing so, the progress of fouling of the membrane surface of the hollow fiber membrane can be suppressed as much as possible, and the life of the hollow fiber membrane can be extended. It is possible.

〔実施例〕〔Example〕

まず、第1図に基づいて本発明で用いる過装置につい
て説明する。
First, the excess device used in the present invention will be described with reference to FIG.

過装置は、本体胴11とその上部に管板10を挟んで上部
胴(ドーム)13が設けられており、本体胴11の内部には
中空糸膜フイルタ12が設置され、本体胴と上部胴とは管
板で分離されている。そして、本体胴11には、底部に水
入口弁7と逆洗排出弁9とをもつた分枝した配管14と、
上部の管板10の真下に本体胴ベント弁5をもつ配管16と
中間下方に空気スクラビング弁8をもつ配管15が設置さ
れ、また、上部胴(ドーム)13には、胴頂部にベント弁
1と加圧空気弁2とをもつた分枝した配管18と、中間部
にドームドレン弁3をもつ配管17と、過水出口弁4を
もつ配管19とが設置されている。
The transposing device has a main body 11 and an upper body (dome) 13 provided above the main body 11 with a tube sheet 10 sandwiched between them. A hollow fiber membrane filter 12 is installed inside the main body 11. And are separated by a tube sheet. Then, in the main body 11, a branched pipe 14 having a water inlet valve 7 and a backwash discharge valve 9 at the bottom,
A pipe 16 having a main body vent valve 5 and a pipe 15 having an air scrubbing valve 8 in the middle lower part are installed just below an upper tube sheet 10, and an upper body (dome) 13 has a vent valve 1 at the top of the body. A branch pipe 18 having a pressurized air valve 2, a pipe 17 having a dome drain valve 3 in the middle, and a pipe 19 having a superfluid outlet valve 4 are installed.

次に、第1図の工程に従つて、この装置の操作方法を説
明する。中空糸膜過工程(工程1)においては、水入
口弁7及び過水出口弁4を開き、水入口管から中空糸
膜過器に被処理液を導入し、被処理液は過器中に備
えられた複数の中空糸束の中空糸の外側から内側に過
され、過水は中空糸の上端部から管板10の上部胴(ド
ーム)中に引き出され、次いで過水出口弁4を経て
過器から引出される。
Next, a method of operating this device will be described with reference to the steps of FIG. In the hollow fiber membrane passing step (step 1), the water inlet valve 7 and the super water outlet valve 4 are opened, the liquid to be treated is introduced from the water inlet pipe into the hollow fiber membrane filter, and the liquid to be treated is introduced into the filter. The hollow fibers of the plurality of hollow fiber bundles provided therein are passed from the outside to the inside, and the excess water is drawn from the upper end of the hollow fibers into the upper shell (dome) of the tube sheet 10, and then through the excess water outlet valve 4. It is pulled out from the machine.

懸濁物が、中空糸膜の外壁に付着して差圧が一定の値、
或いは差圧上昇度が一定の値以上になつた場合、水入口
弁7及び処理液(過水)出口弁4を閉じて、過装置
の運転を停止する(工程2)。
Suspension adheres to the outer wall of the hollow fiber membrane and the pressure difference is constant,
Alternatively, when the degree of increase in the differential pressure exceeds a certain value, the water inlet valve 7 and the processing liquid (superfluid) outlet valve 4 are closed to stop the operation of the excess device (step 2).

ついで、本体胴ベント弁5及び空気スクラビング弁8を
開き、空気スクラビング弁8より本体胴中に空気を導入
し、所定時間スクラビングを行うことにより、中空糸膜
外壁に付着している懸濁物のはくりを促進させる(工程
3)。この工程は、水にぬれた状態で中空糸膜面を空気
が透過しない膜において特に重要である。
Then, the main body cylinder vent valve 5 and the air scrubbing valve 8 are opened, air is introduced into the main body cylinder from the air scrubbing valve 8, and scrubbing is performed for a predetermined time to suspend the suspension adhered to the outer wall of the hollow fiber membrane. Accelerate peeling (step 3). This step is particularly important for a membrane in which air does not permeate the hollow fiber membrane surface when wet with water.

この工程終了時において、本体胴内の水位は空気スクラ
ビングの際に導入され残留している空気の体積分だけ低
下しているので、空気スクラビング弁8を閉じると共に
水入口弁7を開いて、水入口弁7より水を導入し、管板
10の下まで液張りを行ない(工程4)、ついで本体胴ベ
ント弁5及び水入口弁7を閉じ、加圧空気弁2及びドー
ムドレン弁3を開いて、ドームドレン口より上部のドー
ムドレンを行う(工程5)。
At the end of this step, the water level in the body barrel has dropped by the volume of the air introduced and remaining during the air scrubbing, so the air scrubbing valve 8 is closed and the water inlet valve 7 is opened. Water is introduced through the inlet valve 7 and the tube sheet
Liquid is filled to the bottom of 10 (step 4), then the main body vent valve 5 and the water inlet valve 7 are closed, the pressurized air valve 2 and the dome drain valve 3 are opened, and the dome drain above the dome drain port is opened. Perform (step 5).

ついで、ドームドレン弁3を閉じ、加圧空気により上部
胴中の空気を所定圧力まで加圧し(工程6)た後、本体
胴下部の逆洗排出弁9を開き、上部胴中の水により中空
糸膜のバンプを行ない、中空糸膜に付着している懸濁物
のはくりを行なつた後(工程7)、本体胴ベント弁5を
開いてはくりされた懸濁物を保有している液を排出する
と共に、加圧空気弁2を閉、ベント弁1を開として上部
胴内の圧力を開放する(工程8)。
Next, the dome drain valve 3 is closed, and the air in the upper body is pressurized to a predetermined pressure with pressurized air (step 6), and then the backwash discharge valve 9 in the lower portion of the main body is opened to be hollowed by the water in the upper body. After bumping the fiber membrane and peeling the suspension adhering to the hollow fiber membrane (step 7), the main body vent valve 5 is opened to hold the suspended suspension. While discharging the liquid, the pressurized air valve 2 is closed and the vent valve 1 is opened to release the pressure in the upper body (step 8).

ついで、ベント弁1を閉じ、水入口弁7、空気スクラビ
ング弁8を開いて、本体胴内を空気スクラビングをしな
がら水位を上げていく(工程9)。水位が管板に達した
時点で水入口弁7を閉じ、所定時間中空糸膜のスクラビ
ングを行い、中空糸膜に付着している懸濁物質のはくり
を更に促進した後(工程10)、空気スクラビング弁8を
閉じ、水入口弁7を開いて管板下まで液張りを行ない
(工程11)、続いてドームドレン弁3を開いて、本体胴
ベント弁5を閉じて、ドームドレン口まで上部胴の液張
りを行なう(工程12)。
Next, the vent valve 1 is closed, the water inlet valve 7 and the air scrubbing valve 8 are opened, and the water level is raised while air scrubbing the inside of the main body (step 9). When the water level reaches the tube plate, the water inlet valve 7 is closed, and the hollow fiber membrane is scrubbed for a predetermined time to further promote the peeling of the suspended substance adhering to the hollow fiber membrane (step 10), The air scrubbing valve 8 is closed, the water inlet valve 7 is opened to perform liquid filling under the tube plate (step 11), then the dome drain valve 3 is opened, the main body vent valve 5 is closed, and the dome drain port is reached. Perform liquid filling of the upper body (step 12).

該液張りが終わつた後、水入口弁7、本体胴ベント弁5
を閉じ、加圧空気弁2を開けて、加圧空気により上部胴
(上部ドーム)内を所定の圧力まで加圧した後(工程1
3)、逆洗排出弁9を開けて、上部胴内の水により中空
糸膜のバンプを行い(工程14)、ついで本体胴ベント弁
5を開いて、はくりされた懸濁物質を保有している液を
排出すると共に、加圧空気弁2を閉、ベント弁1を開と
して上部胴内の圧力を開放する(工程15)。ついで逆洗
排出弁9を閉じ、水入口弁8を開け管板下まで液張りを
行なつた後(工程16)、本体胴ベント弁5を閉じ、上部
胴の液張りをも行ない(工程17)、満水後水入口弁7及
びベント弁1を閉じて停止状態とし(工程18)、次の
過工程(工程1)に備える。
After the liquid filling is finished, the water inlet valve 7, the main body vent valve 5
Closed, the pressurized air valve 2 is opened, and the inside of the upper body (upper dome) is pressurized to a predetermined pressure with pressurized air (Step 1
3) Open the backwash discharge valve 9 to bump the hollow fiber membrane with water in the upper cylinder (step 14), then open the main cylinder vent valve 5 to retain the suspended suspended substance. While discharging the liquid, the pressurized air valve 2 is closed and the vent valve 1 is opened to release the pressure in the upper body (step 15). Then, the backwash discharge valve 9 is closed, the water inlet valve 8 is opened, and liquid is filled up to the bottom of the tube plate (step 16). Then, the main body vent valve 5 is closed and the upper body is filled with liquid (step 17). ), After the water is full, the water inlet valve 7 and the vent valve 1 are closed to bring them into a stopped state (step 18) to prepare for the next overstep (step 1).

本発明においては、中空糸膜フイルタの逆洗を行うべく
過操作を停止(工程2)した後、直ちに中空糸膜の空
気スクラビングを行ない(工程3)、管板下液張り、ド
ームドレン、及びドーム加圧を行なつた後中空糸膜のバ
ンプを行なつて(工程7)中空糸膜に付着している懸濁
物を効率よくはくりし、ついで本体胴内の懸濁物を含む
液を排出後(工程8)、管板下まで液張りする過程で空
気スクラビングを行ない、水面での懸濁物はくり効果を
あげる。
In the present invention, after over-operation is stopped to carry out backwashing of the hollow fiber membrane filter (step 2), air scrubbing of the hollow fiber membrane is immediately carried out (step 3), liquid filling under tube sheet, dome drain, and After applying dome pressure, bumps on the hollow fiber membrane are applied (step 7) to effectively disperse the suspension adhering to the hollow fiber membrane, and then the liquid containing the suspension in the body barrel. After being discharged (step 8), air scrubbing is performed in the process of filling the tube plate with the liquid under the tube plate to enhance the effect of removing suspended matter on the water surface.

管板下まで液張り後(工程9)、給水を止めてのスクラ
ビング工程(工程10)、管板下液張り工程(工程11)、
上部胴液張り工程(工程12)、ドーム加圧工程(工程1
3)、バンプ工程(工程14)、管板下排出工程(工程1
5)を行うもので、スクラビング工程をバンプ工程に優
先して行ない、かつスクラビング工程とバンプ工程とを
二回繰り返すことにより、中空糸膜からの懸濁物のはく
り除去を完全ならしめるものである。
After filling the bottom of the tube plate (step 9), scrubbing step with stopping water supply (step 10), bottom tube plate filling step (step 11),
Upper body fluid filling process (process 12), dome pressure process (process 1)
3), bump process (process 14), lower tube sheet discharge process (process 1)
5) is performed, and the scrubbing process is prioritized over the bump process, and the scrubbing process and the bump process are repeated twice to completely remove the suspended matter from the hollow fiber membrane. is there.

また、工程4の管板下液張り工程をドーム水を用いて行
なうことにより、わずかではあるが、廃液発生量の低減
に役立つ。具体的には水入口弁7閉、本体胴ベント弁5
開で、空気入口弁1またはベント弁1を開として管板下
まで液張りする。(特許請求の範囲2) また、工程9から工程15までの一連の工程を1組とし、
この一連の工程を2組以上組み込むことにより、さらに
中空膜の汚染を効率良く防止することが出来、安定した
過操作を行うことが可能となる。
In addition, by performing the under-tube-plate liquid filling step of step 4 using dome water, the amount of waste liquid generated can be reduced, albeit slightly. Specifically, the water inlet valve 7 is closed, the main body vent valve 5
When opened, the air inlet valve 1 or the vent valve 1 is opened and liquid is filled up to the bottom of the tube sheet. (Claim 2) Further, a series of steps 9 to 15 is set as one set,
By incorporating two or more sets of this series of steps, it is possible to efficiently prevent the hollow membrane from being contaminated, and to perform stable overoperation.

なお、工程7及び工程14において液が管板下まで排出さ
れないのは、本発明で用いる中空糸膜が空気を通さない
からである。
The reason why the liquid is not discharged below the tube sheet in steps 7 and 14 is that the hollow fiber membrane used in the present invention does not pass air.

また、図面に関する説明においては、加圧空気室をフイ
ルタ容器内に設けているが、この部分を外部に設けるこ
ともできる。
Further, although the pressurized air chamber is provided in the filter container in the description of the drawings, this portion may be provided outside.

〔発明の効果〕〔The invention's effect〕

本発明は、中空糸膜の逆洗に際し、スクラビング工程を
バンプ工程に優先して行い、スクラビングとバンプ工程
の組を最低2回とり入れることにより、効率のよい逆洗
を行うことができたから、中空糸膜の寿命を延ばし、長
時間の使用に耐えることができた。
According to the present invention, when backwashing a hollow fiber membrane, the scrubbing step is prioritized over the bump step, and the backwashing of the scrubbing step and the bump step is performed at least twice, so that the backwashing can be efficiently performed. It was possible to extend the life of the thread film and withstand long-term use.

【図面の簡単な説明】[Brief description of drawings]

第1図は本発明方法を説明するための工程図である。 1……ベント弁、2……加圧空気弁 3……ドームドレン弁、4……過水出口弁 5……本体胴ベント弁、7……水入口弁 8……空気スクラビング弁 9……逆洗排出弁、10……管板 11……本体胴、12……中空糸膜フイルタ 13……上部胴(ドーム) FIG. 1 is a process diagram for explaining the method of the present invention. 1 ... Vent valve, 2 ... Pressurized air valve, 3 ... Dome drain valve, 4 ... Overwater outlet valve, 5 ... Main body vent valve, 7 ... Water inlet valve, 8 ... Air scrubbing valve, 9 ... Backwash discharge valve, 10 …… Tube plate 11 …… Main body cylinder, 12 …… Hollow fiber membrane filter 13 …… Upper body (dome)

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】水にぬれた状態では空気を通さない中空糸
膜フイルムを用いて、放射性廃液又は復水を中空糸膜の
外側から内側に通すことにより過する方法において、
次のAからPの工程を順次行うことを特徴とする中空糸
膜の逆洗方法。 (A)放射性廃液又は復水を中空糸膜過器(11)に供
給して過する工程(工程1)において、差圧が所定値
に達した後過を停止し(工程2)、ついで、本体胴ベ
ント弁(5)及び空気スクラビング弁(8)を開いて、
空気スクラビング弁(8)より空気を導入し、所定時間
空気スクラビングを行なう工程(工程3) (B)空気スクラビング弁(8)を閉じ、水入口弁
(7)を開いて水を導入して管板下まで液張りを行なう
工程(工程4) (C)本体胴ベント弁(5)及び水入口弁(7)を閉
じ、加圧空気弁(2)及びドームドレン弁(3)を開い
てドームドレンを行なう工程(工程5) (D)ドームドレン弁(3)を閉じ、加圧空気により所
定圧力まで加圧を行なう工程(工程6) (E)逆洗排出弁(9)を開き、上部胴中の水によりバ
ンプを行なう工程(工程7) (F)ついで、加圧空気弁(2)を閉じ、ベント弁
(1)を開き、本体胴ベント弁(5)を開とし、上部胴
内を開放するとともに管板下の廃液を排出する工程(工
程8) (G)ベント弁(1)を閉じ、逆洗排出弁(9)を閉
じ、水入口弁(7)を開き、空気スクラビング弁(8)
を開とし、管板下まで水位をあげる過程で空気スクラビ
ングを行なう工程(工程9) (H)水入口弁(7)を閉とし、所定時間空気スクラビ
ングを行なう工程(工程10) (I)空気スクラビング弁(8)を閉じ、水入口弁
(7)を開いて管板下まで液張りを行なう工程(工程1
1) (J)ドームドレン弁(3)を開き、本体胴ベント弁
(5)を閉じ、ドームドレン口まで液張りする工程(工
程12) (K)水入口弁(7)、ドームドレン弁(3)を閉じ、
加圧空気弁(2)を開けて加圧空気により、所定圧力ま
でドームの加圧を行なう工程(工程13) (L)逆洗排出弁(9)を開け、上部胴中の水によりバ
ンプを行なう工程(工程14) (M)ついで加圧空気弁(2)を閉じ、ベント弁(1)
を開き、本体胴ベント弁(5)を開とし、上部胴内を開
放するとともに管板下の廃液を排出する工程(工程15) (N)ドームドレン弁(3)、逆洗排出弁(9)を閉
じ、本体胴ベント弁(5)及び水入口弁(7)を開け、
管板下まで液張りを行なう工程(工程16) (O)本体胴ベント弁(5)を閉じ、上部胴をも液張り
する工程(工程17) (P)満水後水入口弁(7)、ベント弁(1)を閉じ停
止状態とする工程(工程18)
1. A method of passing radioactive waste liquid or condensate from the outside to the inside of a hollow fiber membrane by using a hollow fiber membrane film that is impermeable to air when wet with water,
A method for backwashing a hollow fiber membrane, which comprises sequentially performing the following steps A to P. (A) In the step (step 1) of supplying the radioactive waste liquid or the condensate to the hollow fiber membrane filter (11) and passing it, the pressure is stopped after the differential pressure reaches a predetermined value (step 2), and then, Open the main body vent valve (5) and air scrubbing valve (8),
Step of introducing air from the air scrubbing valve (8) and performing air scrubbing for a predetermined time (step 3) (B) The air scrubbing valve (8) is closed, the water inlet valve (7) is opened and water is introduced into the pipe. Step of performing liquid filling to the bottom of the plate (step 4) (C) The main body vent valve (5) and the water inlet valve (7) are closed, and the pressurized air valve (2) and the dome drain valve (3) are opened to open the dome. Step of draining (step 5) (D) Step of closing dome drain valve (3) and pressurizing with pressurized air to a predetermined pressure (step 6) (E) Opening backwash discharge valve (9) Step of bumping with water in the body (Step 7) (F) Then, the pressurized air valve (2) is closed, the vent valve (1) is opened, the main body vent valve (5) is opened, and the inside of the upper body is opened. Opening the valve and discharging the waste liquid under the tube sheet (step 8) (G) Vent valve ( ) Closed, closing the backwash outlet valve (9), open water inlet valve (7), the air scrubbing valve (8)
Open, and perform air scrubbing in the process of raising the water level below the tube sheet (step 9) (H) Close the water inlet valve (7) and perform air scrubbing for a predetermined time (step 10) (I) Air The step of closing the scrubbing valve (8) and opening the water inlet valve (7) to perform liquid filling under the tube sheet (step 1
1) (J) Opening the dome drain valve (3), closing the main body vent valve (5), and filling liquid to the dome drain port (process 12) (K) Water inlet valve (7), dome drain valve ( 3) close,
Step of opening the pressurized air valve (2) and pressurizing the dome to a predetermined pressure with pressurized air (step 13) (L) Open the backwash discharge valve (9) and use the water in the upper barrel to bump the bumps. Steps to be performed (Step 14) (M) Then, the pressurized air valve (2) is closed, and the vent valve (1)
Open the main body cylinder vent valve (5) to open the upper cylinder and discharge the waste liquid under the tube sheet (process 15) (N) dome drain valve (3), backwash discharge valve (9) ) Is closed, the main body vent valve (5) and the water inlet valve (7) are opened,
Step of performing liquid filling up to the bottom of the tube plate (Step 16) (O) Step of closing the main body vent valve (5) and filling the upper body with liquid (Step 17) (P) Full water filling water inlet valve (7), A step of closing the vent valve (1) and stopping it (step 18)
【請求項2】特許請求の範囲第1項記載の中空糸膜の逆
洗方法において、工程Bの管板下液張り工程をドーム水
を用いて行なうこと、すなわち、水入口弁(7)は閉
じ、加圧空気弁(2)、本体胴ベント弁(5)を開と
し、管板下を液張りするか、水入口弁(7)は閉じ、ベ
ント弁(1)、本体胴ベント弁(5)を開とし、管板下
を液張りする方法とすることを特徴とする中空糸膜の逆
洗方法。
2. The method of backwashing a hollow fiber membrane according to claim 1, wherein the step B of sub-tube plate filling is performed using dome water, that is, the water inlet valve (7) is Closed, the pressurized air valve (2) and the main body vent valve (5) are opened and liquid is filled under the tube plate, or the water inlet valve (7) is closed, the vent valve (1), the main body vent valve ( A method for backwashing a hollow fiber membrane, characterized in that 5) is opened and the bottom of the tube sheet is filled with liquid.
【請求項3】特許請求の範囲第1又と2記載の中空糸膜
の逆洗方法において、工程Fと工程Nの間に、工程Gか
ら工程Mまでの一連の工程を1組とし、該一連の工程を
2組以上設けることを特徴とする中空糸膜の逆洗方法。
3. The method for backwashing a hollow fiber membrane according to claim 1 or 2, wherein a series of steps from step G to step M is formed between step F and step N, A method for backwashing a hollow fiber membrane, which comprises providing two or more sets of a series of steps.
JP18025488A 1988-07-21 1988-07-21 Backwashing method for hollow fiber membrane filters Expired - Lifetime JPH0760197B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18025488A JPH0760197B2 (en) 1988-07-21 1988-07-21 Backwashing method for hollow fiber membrane filters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18025488A JPH0760197B2 (en) 1988-07-21 1988-07-21 Backwashing method for hollow fiber membrane filters

Publications (2)

Publication Number Publication Date
JPH0231200A JPH0231200A (en) 1990-02-01
JPH0760197B2 true JPH0760197B2 (en) 1995-06-28

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Country Link
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* Cited by examiner, † Cited by third party
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AUPR692401A0 (en) 2001-08-09 2001-08-30 U.S. Filter Wastewater Group, Inc. Method of cleaning membrane modules
NZ562786A (en) 2005-04-29 2010-10-29 Siemens Water Tech Corp Chemical clean for membrane filter
US8858796B2 (en) 2005-08-22 2014-10-14 Evoqua Water Technologies Llc Assembly for water filtration using a tube manifold to minimise backwash
CN100408493C (en) * 2006-01-28 2008-08-06 北京·松下彩色显象管有限公司 Sewage treating system with changeable water treating process
JP2008221178A (en) * 2007-03-15 2008-09-25 Kuraray Co Ltd Cleaning method of hollow fiber membrane module
US9764288B2 (en) 2007-04-04 2017-09-19 Evoqua Water Technologies Llc Membrane module protection
KR101239780B1 (en) 2007-05-29 2013-03-06 지멘스 인더스트리 인코포레이티드 Membrane cleaning with pulsed airlift pump
KR101614520B1 (en) 2008-07-24 2016-04-21 에보쿠아 워터 테크놀로지스 엘엘씨 Frame system for membrane filtration modules
AU2010101488B4 (en) 2009-06-11 2013-05-02 Evoqua Water Technologies Llc Methods for cleaning a porous polymeric membrane and a kit for cleaning a porous polymeric membrane
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AU2011305377B2 (en) 2010-09-24 2014-11-20 Evoqua Water Technologies Llc Fluid control manifold for membrane filtration system
WO2013049109A1 (en) 2011-09-30 2013-04-04 Siemens Industry, Inc. Isolation valve
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JP2015077530A (en) * 2012-01-24 2015-04-23 東レ株式会社 Water production method and water production device
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