JPH0671540B2 - Method for cleaning hollow fiber membrane filter - Google Patents

Method for cleaning hollow fiber membrane filter

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Publication number
JPH0671540B2
JPH0671540B2 JP31958988A JP31958988A JPH0671540B2 JP H0671540 B2 JPH0671540 B2 JP H0671540B2 JP 31958988 A JP31958988 A JP 31958988A JP 31958988 A JP31958988 A JP 31958988A JP H0671540 B2 JPH0671540 B2 JP H0671540B2
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JPH02164423A (en )
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喜与志 伊藤
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株式会社東芝
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【発明の詳細な説明】 [発明の目的] (産業上の利用分野) 本発明は中空糸膜フィルタの洗浄方法に関するものである。 DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (FIELD OF THE INVENTION) The present invention relates to a method for cleaning the hollow fiber membrane filter.

(従来の技術) 中空糸膜フィルタは、一般に単位容積当りの膜面積が大きくとれるため、装置のコンパクト化が図れ、しかも除去性能が優れていることから各種の濾過装置に広く用いられている。 (Prior Art) hollow fiber membrane filter is generally to membrane area per unit volume, can be increased, Hakare is the apparatus compact, yet widely used in a variety of filtration devices because of its excellent removal performance. しかし、中空糸膜フィルタは被処理水中に含まれるクラッド等の除去対象物が中空糸膜の外表面に付着するため、濾過処理時間の経過に伴い除去対象物の付着量が増加し、次第に濾過効率が低下する。 However, since the hollow fiber membrane filter to remove objects such as the clad materials contained in the water to be treated from adhering to the outer surface of the hollow fiber membrane, increasing the adhesion amount of elapsed with removal object filtration time gradually filtered efficiency is reduced. そこで、 there,
このような問題に対処するために、中空糸膜フィルタを形成する中空糸膜の内側に加圧気体を導入して濾過液又は洗浄水を中空糸膜の内側から外側へ噴出させるとともに、前記中空糸膜フィルタの下方より多数の気泡を上方へ向けて噴出させて中空糸膜の外表面に付着した付着物を逆洗洗浄する方法が特開昭60−19002号において提案されている。 To address this problem, along with the jetting hollow fiber filtrate by introducing a pressurized gas inside the film or washing water to form a hollow fiber membrane filter from the inside of the hollow fiber membrane to the outside, the hollow fiber membrane method a number of air bubbles from below the filter is ejected upward backwash cleaning deposits adhering to the outer surface of the hollow fiber membrane it has been proposed in JP 60-19002.

第2図は中空糸膜フィルタを用いた濾過装置の構成を示すもので、中空糸膜フィルタ1を収容する容器本体2 FIG. 2 shows the structure of a filtration apparatus using a hollow fiber membrane filter, a container body 2 accommodating the hollow fiber membrane filter 1
は、処理液室2aと濾過液室2bの2室から構成されている。 It is composed of two chambers of the processing liquid chambers 2a and filtrate chamber 2b. 上記処理液室2aには処理液室2a内に処理液を導入する処理液供給管3が開閉弁4を介して接続されているとともに、処理液室2a内にてオーバーフローした処理液を系外へ排出するオーバーフロー管5が開閉弁6を介して接続されている。 With a processing liquid supply pipe 3 for introducing a treatment liquid to the treatment liquid chamber 2a is connected via an on-off valve 4 is in the treatment solution chamber 2a, the outside of the system the processing liquid overflowing in the process fluid chamber 2a overflow pipe 5 for discharging the is connected via an on-off valve 6. また、処理液室2aの下部には処理液室 Further, the bottom of the processing liquid chambers 2a treatment liquid chamber
2a内に加圧気体を供給する第1の加圧気体供給管7が開閉弁8を介して接続されており、さらに処理液室2aの底部には処理液室2a内に貯溜された凝縮廃液を排出する濃縮廃液排出管9が開閉弁10を介して接続されている。 First pressurized gas supply pipe 7 for supplying the pressurized gas into 2a is connected via an on-off valve 8, the condensed waste further in the bottom portion of the processing liquid chambers 2a which is accumulated in the process liquid chamber 2a concentrated waste liquid discharge pipe 9 is connected via an on-off valve 10 for discharging.

一方、前記濾過液室2bには中空糸膜フィルタ1で濾過された濾過液を系外へ排出する濾過液排出管11が開閉弁12 Meanwhile, the the filtrate chamber 2b filtrate discharge pipe 11 for discharging the filtrate filtered by the hollow fiber membrane filter 1 out of the system is on-off valve 12
を介して接続されているとともに、濾過液室2b内に加圧気体を供給する第2の気体供給管13が開閉弁14を介して接続されている。 Together are connected via a second gas supply pipe 13 is connected via an on-off valve 14 for supplying pressurized gas to the filtrate chamber 2b.

上記のような構成において、処理液供給管3より供給される処理液を濾過処理する場合には、まず開閉弁4および開閉弁12を開とし、処理液供給管3より処理液を処理液室2a内に導入する。 With the above construction, the processing liquid when the process liquid supplied from the supply pipe 3 and filtered process, the on-off valve 4 and the on-off valve 12 is opened first, the process liquid treatment solution chamber treatment liquid from the supply pipe 3 It is introduced into the 2a. 処理液室2a内に導入された処理液は中空糸膜フィルタ1で濾過され、濾過液は濾過液室2b Treatment liquid introduced into the processing liquid chamber 2a is filtered by the hollow fiber membrane filter 1, filtrate filtrate chamber 2b
から濾過液排出管11を介して系外へ排出される。 Through the filtrate discharge pipe 11 from being discharged out of the system. 一方、 on the other hand
処理液中の懸濁物は中空糸膜フィルタ1の外側で捕捉され、中空糸膜フィルタ1を形成する中空糸膜の外表面に付着する。 Suspension of the treatment liquid is captured on the outside of the hollow fiber membrane filter 1, to adhere to the outer surface of the hollow fiber membrane to form a hollow fiber membrane filter 1. ここで、中空糸膜の外表面に処理液中の懸濁物が付着すると、処理液室2aと濾過液室2bとの圧力差である濾過差圧が上昇する。 Here, the suspension in the processing liquid to the outer surface of the hollow fiber membrane is attached, filtered pressure difference between the treatment liquid chamber 2a is a pressure difference between the filtrate chamber 2b is raised. したがって、濾過差圧が中空糸膜フィルタ1の種類、濾過処理装置の設計容量などによって定まる使用限界差圧に達した時点で開閉弁4および開閉弁12を閉とし、濾過処理運転を中止して後述する逆洗洗浄を行う。 Accordingly, the filtration pressure difference hollow fiber membrane filter 1 type, the on-off valve 4 and the on-off valve 12 is closed, to stop the filtration operation when it reaches the use limit pressure difference determined by such design capacity of the filtration apparatus performing a backwashing cleaning, which will be described later.

すなわち、まず開閉弁14を開いて加圧気体を濾過液室2b That is, first by opening the on-off valve 14 pressurized gas filtrate chamber 2b
内に導入し、濾過液室2b内の濾過液と中空糸膜フィルタ1中の少量の濾過液を加圧気体によって濾過方向と逆方向に押し出す。 Introduced within, pushes the filtration direction and the reverse direction a small amount of filtrate of the filtrate and the hollow fiber membrane filter 1 of the filtrate chamber 2b by pressurized gas. これと同時に、開閉弁8を開いて気体供給管7より加圧気体を処理液室2aに導入し、中空糸膜フィルタ1の下方より多数の気泡を上方へ向けて噴出させ、中空糸膜フィルタ1を激しく振動させる。 At the same time, by opening the on-off valve 8 is introduced into the processing liquid chamber 2a a more pressurized gas the gas supply pipe 7, is ejected a plurality of bubbles from the bottom of the hollow fiber membrane filter 1 upward, the hollow fiber membrane filter 1 to violently vibrate. そして、 And,
この操作を所定時間続けた後、開閉弁8,14を閉として気体の供給を停止させ、次いで中空糸膜フィルタ1より剥離除去された微粒子を含む濃縮廃液を開閉弁10を開いて濃縮廃液管9より排出する。 After continuing this operation predetermined times, the on-off valve 8, 14 the supply of gas is stopped as closing, then the concentrated liquid waste pipe by opening the on-off valve 10 a concentrated liquid waste containing fine particles which are peeled off from the hollow fiber membrane filter 1 It is discharged from the 9.

ところで、前述した従来の洗浄方法は中空糸膜フィルタ1に振動を与えながら中空糸膜フィルタ1に付着した濾過物を逆洗により除去する方法であることから、逆洗のみの方法に比べて濾過物を効果的に除去することができる。 Meanwhile, filtered compared since conventional cleaning method described above is a method for removing filtrate deposited on the hollow fiber membrane filter 1 while applying vibration to the hollow fiber membrane filter 1 by backwashing, the method only backwash it can be removed goods effectively. しかしながら、前述した従来方法では中空糸膜フィルタ1の下部に付着した濾過物は比較的容易に除去されるが、中空糸膜フィルタ1の上部では中空糸膜フィルタ1への加振効果が弱いため、濾過物が残存し易い。 However, although the filtrate was adhered to the bottom of the hollow fiber membrane filter 1 in the conventional method described above is relatively easily removed, because weak vibration effect of the hollow fiber membrane filter 1 at the top of the hollow fiber membrane filter 1 , easy filtrate is left. このため、このような状態で濾過処理運転に移行すると、濾過処理運転を再開してから比較的早期の段階で中空糸膜フィルタが目詰りを起し易いという問題があった。 Thus, shifting to filtration treatment operation in such a state, the hollow fiber membrane filter is disadvantageously prone to clogging in a relatively early stage after restart the filtration operation.

なお、前述した洗浄方法以外にも処理液室2aに薬品(例えば過酸化水素)を注入して中空糸膜フィルタ1を洗浄する方法もあるが、使用回数が増えると樹脂等の繊維で構成された中空糸膜が劣化し、フィルタ機能を維持できなくなるという問題を有していた。 Incidentally, there is a method of cleaning a hollow fiber membrane filter 1 by injecting chemicals (e.g. hydrogen peroxide) to the treatment liquid chamber 2a besides cleaning method described above, is composed of fibers such as a resin when the number of uses increases hollow fiber membrane is degraded, there is a problem that can not be maintained filter function.

(発明が解決しようとする課題) 上述した如く、従来においては中空糸膜フィルタ1から濾過物が完全に除去されない状態で濾過処理運転に移行すると、濾過処理運転を再開してから比較的早期の段階で中空糸膜フィルタ1が目詰りを起こし、使用限界差圧に達するため、濾過処理運転の運転時間が短いという問題があった。 As the (invention Problems to be Solved) above, in the conventional the filtrate from the hollow fiber membrane filter 1 is shifted to the filtration treatment operation in a state that is not completely removed, a relatively early stage from resuming filtration operation step cause hollow fiber membrane filter 1 is clogged, in order to reach the usage limit pressure difference, there is a problem that a short operating time of the filtration process operation.

本発明は上記のような問題点に鑑みてなされたものであり、その目的は中空糸膜フィルタに付着した濾過物をより効果的に除去することのできる中空糸膜フィルタの洗浄方法を提供しようとするものである。 The present invention has been made in view of the above problems, and its object is to provide a method for cleaning the hollow fiber membrane filter capable of more effectively removing filtrate deposited on the hollow fiber membrane filter it is an.

[発明の構成] (課題を解決するための手段) 上記目的を達成するために本発明は、中空糸膜フィルタの外表面に付着した濾過物を逆洗により除去する際に、 The present invention in order to achieve the structure of the invention] (Means for Solving the Problems) The above object, the filtrate deposited on the outer surface of the hollow fiber membrane filter in removing by backwashing,
前記中空糸膜フィルタが収容された容器内に多数の気泡を発生させて前記中空糸膜フィルタを振動させるとともに、前記容器内の液位を下降させることを特徴とするものである。 With vibrating the hollow fiber membrane filter by generating a number of air bubbles in the hollow fiber membrane filter is accommodated in a container, it is characterized in lowering the liquid level in the container.

(作用) 本発明では、中空糸膜フィルタの外表面に付着した濾過物を逆洗により除去する際に中空糸膜フィルタが収容された容器内の液位を下降させると、中空糸膜フィルタの表面全体が気泡の消失効果により一様に洗浄されるので、中空糸膜フィルタに付着した濾過物をより効果的に除去することができる。 (Operation) In the present invention, the hollow fiber membrane filter lowers the liquid level in the housed container when removing the filtrate adhering to the outer surface of the hollow fiber membrane filter by backwash, the hollow fiber membrane filter since the entire surface is uniformly cleaned by the disappearance effect of the bubble can be removed more effectively filtrate adhering to the hollow fiber membrane filter.

(実施例) 第1図は本発明方法を説明するための中空糸膜フィルタを用いた濾過装置の構成を示すもので、第2図と同一部分には同一符号を付し、その部分の説明は省略する。 (Example) The first figure shows a structure of a filtration apparatus using a hollow fiber membrane filter for explaining the present invention method, the same reference numerals in FIG. 2 the same parts, description thereof It omitted. 第1図において、濾過液室2b内に加圧気体を供給する気体供給配管13にはベント管15が開閉弁16を介して接続されており、上記開閉弁16および気体供給配管13の開閉弁14 In Figure 1, the filtrate chamber to the gas supply pipe 13 for supplying pressurized gas into the 2b are connected vent pipe 15 via an on-off valve 16, the on-off valve of the on-off valve 16 and the gas supply pipe 13 14
は制御器17によって交互に開閉制御される構成となっている。 It is configured to be opened and closed alternately controlled by the controller 17.

上記のような構成において、濾過処理運転中に中空糸膜フィルタ1の濾過差圧が予め定められた設定値を越えた場合には、まず開閉弁4および開閉弁12を閉として濾過処理運転を中止し、次のような逆洗洗浄を行う。 With the above construction, the filtration operation when exceeding the filtration treatment operation setting values ​​filtration differential pressure of the hollow fiber membrane filter 1 is predetermined in the first on-off valve 4 and the on-off valve 12 is closed to stop, perform a backwash cleaning such as the following. まず開閉弁14および開閉弁6を開とし、気体供給管13より加圧気体を濾過液室2bに導入する。 First and the on-off valve 14 and the on-off valve 6 opens, introducing a pressurized gas from the gas supply pipe 13 to the filtrate chamber 2b. これと同時に、開閉弁8 At the same time, the on-off valve 8
を開いて加圧気体を処理液室2aに導入し、中空糸膜フィルタ1の下方より多数の気泡を上方へ向けて噴出させ、 The Open introducing pressurized gas into the processing liquid chamber 2a, is ejected a plurality of bubbles from the bottom of the hollow fiber membrane filter 1 upward,
中空糸膜フィルタ1を振動させながら逆洗を行う。 A hollow fiber membrane filter 1 performs backwash while shaking. 次に、この逆洗を所定時間続けた後、制御器17により開閉弁14および開閉弁16を交互に開閉させ、中空糸膜フィルタ1に圧力脈動を与える。 Then, after continuing the backwash predetermined time, alternately to open and close the closing valve 14 and the on-off valve 16 by the controller 17, giving the pressure pulsation to the hollow fiber membrane filter 1. また、このとき開閉弁10を開いて処理液室2aに貯溜された処理液の液面を徐々に下降させる。 Also, gradually lowering the liquid level of the reservoir has been treated liquid to the treatment liquid chamber 2a by opening the on-off valve 10 at this time. そして、この操作を複数回繰り返す。 Then, it repeated a plurality of times this operation.

このように本方法では、中空糸膜フィルタ1の外表面に付着した付着物を逆洗により除去する際に、中空糸膜フィルタ1が収容された容器本体2の処理液室2aに多数の気泡を発生させて中空糸膜フィルタ1に振動を与えるとともに、処理液室2aの液位を降下させると、気泡の消失効果により中空糸膜フィルタ1の表面全体が一様に洗浄される。 Thus, in this method, the deposits adhering to the outer surface of the hollow fiber membrane filter 1 when removing the backwash, a number of air bubbles into the hollow fiber membrane treatment solution chamber 2a of the filter 1 container body 2 which is accommodated with vibrated the hollow fiber membrane filter 1 by generating and lowering the liquid level of the processing liquid chambers 2a, the entire surface of the hollow fiber membrane filter 1 is uniformly cleaned by the disappearance effect of bubbles. したがって、中空糸膜フィルタ1の外表面に付着した付着物をより効果的に除去することができ、逆洗後の初期差圧の上昇率を低い値に抑えることができる。 Therefore, it is possible to more effectively remove deposits adhering to the outer surface of the hollow fiber membrane filter 1, it is possible to suppress the increase rate of the initial differential pressure after backwashing at a low value.
また、このとき制御器17により開閉弁14および開閉弁16 Moreover, the on-off valve 14 and closing valve by the controller 17 at this time 16
を交互に開閉させ、中空糸膜フィルタ1に圧力脈動を与えることにより、より効果的に中空糸膜フィルタ全体を一様に洗浄することができ、しかも処理液室2aの液面下降及び上昇を複数回繰り返すことにより、さらに効果的に中空糸膜フィルタ全体を一様に洗浄することができる。 The opened and closed alternately, by providing a pressure pulsation in the hollow fiber membrane filter 1, the more effectively the entire hollow fiber membrane filter can be uniformly cleaned, yet the liquid level lowered and raised the processing liquid chambers 2a by repeating a plurality of times, it is possible to more effectively uniform cleaning across the hollow fiber membrane filter.

なお、本発明は上記実施例に限定されるものではない。 The present invention is not limited to the above embodiments.
例えば、上記実施例では中空糸膜フィルタ全体をより効果的に洗浄するために、中空糸膜フィルタ1に加圧気体の圧力脈動を与えながら処理液室2aの液面を下降させたが、必ずしも中空糸膜フィルタ1に加圧気体の圧力脈動を与える必要はなく、中空糸膜フィルタ1の濾過差圧に応じて適宜行えばよい。 For example, in order in the above-described embodiment to clean the entire hollow fiber membrane filter more effectively, although the liquid level of the processing liquid chambers 2a while applying pressure pulsations in the hollow fiber membrane filter 1 pressurized gas is lowered, always it is not necessary to provide a hollow fiber membrane filter 1 the pressure pulsation of the pressurized gas, it may be performed as appropriate depending on the filtration pressure difference of the hollow fiber membrane filter 1.

[発明の効果] 以上説明したように本発明によれば、中空糸膜フィルタの外表面に付着した付着物をより効果的に除去することができる。 According to the present invention as has been described [Effect of the invention], it is possible to more effectively remove deposits adhering to the outer surface of the hollow fiber membrane filter.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

第1図は本発明方法を説明するための中空糸膜フィルタを用いた濾過装置の構成図、第2図は従来の洗浄方法を説明するための濾過装置の構成図である。 Figure 1 is a diagram showing the construction of a filtration apparatus using a hollow fiber membrane filter for explaining the present invention method, FIG. 2 is a block diagram of a filtering device for explaining a conventional method of cleaning. 1……中空糸膜フィルタ、2……容器本体、2a……処理液室、2b……濾過液室、3……濾過液供給管、5……オーバーフロー管、7……気体供給管、9……凝縮廃液供給管、11……濾過液排出管、13……気体供給管、15…… 1 ...... hollow fiber membrane filter, 2 ...... container body, 2a ...... treatment solution chamber, 2b ...... filtrate chamber, 3 ...... filtered liquid supply pipe, 5 ...... overflow pipe, 7 ...... gas supply pipe, 9 ...... condensed waste liquid supply pipe, 11 ...... filtrate discharge pipe, 13 ...... gas supply pipe, 15 ......
ベント管、17……制御器。 Vent pipe, 17 ...... controller.

Claims (3)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】中空糸膜フィルタの外表面に付着した濾過物を逆洗により除去する際に、前記中空糸膜フィルタが収容された容器内に多数の気泡を発生させて前記中空糸膜フィルタを振動させるとともに、前記容器内の液位を下降させることを特徴とする中空糸膜フィルタの洗浄方法。 1. A filtrate adhering to the outer surface of the hollow fiber membrane filter in removing by backwashing the hollow fiber membrane filter by generating a number of air bubbles in the hollow fiber membrane filter is accommodated in the container with vibrating the cleaning method of the hollow fiber membrane filter, characterized in that lowering the liquid level in the container.
  2. 【請求項2】中空糸膜フィルタの外表面に付着した濾過物を逆洗により除去する際に、前記中空糸膜フィルタに圧力脈動を与えることを特徴とする請求項1記載の中空糸膜フィルタの洗浄方法。 Wherein the filtrate adhering to the outer surface of the hollow fiber membrane filter in removing by backwashing the hollow fiber membrane filter according to claim 1, wherein the applying pressure pulsation to the hollow fiber membrane filter method of cleaning.
  3. 【請求項3】前記容器内の液位を複数回繰り返して下降させることを特徴とする請求項1記載の中空糸膜フィルタの洗浄方法。 3. A method for cleaning hollow fiber membrane filter according to claim 1, wherein the lowering repeated multiple times liquid level in the container.
JP31958988A 1988-12-20 1988-12-20 Method for cleaning hollow fiber membrane filter Expired - Lifetime JPH0671540B2 (en)

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JPH0671540B2 true JPH0671540B2 (en) 1994-09-14

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