JP2003024754A - Membrane module washing method - Google Patents
Membrane module washing methodInfo
- Publication number
- JP2003024754A JP2003024754A JP2001216849A JP2001216849A JP2003024754A JP 2003024754 A JP2003024754 A JP 2003024754A JP 2001216849 A JP2001216849 A JP 2001216849A JP 2001216849 A JP2001216849 A JP 2001216849A JP 2003024754 A JP2003024754 A JP 2003024754A
- Authority
- JP
- Japan
- Prior art keywords
- membrane module
- hydrogen peroxide
- raw water
- activated carbon
- cleaning
- 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
Landscapes
- Water Treatment By Sorption (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、膜モジュールの洗
浄方法に関し、詳しくは、原水中の溶解性有機物の除去
に有効な粉末活性炭を原水中に投入混合して膜ろ過を行
う膜モジュールの洗浄方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a membrane module, and more particularly, a method for cleaning a membrane module in which powdered activated carbon effective for removing soluble organic substances in raw water is added and mixed in raw water for membrane filtration. Regarding the method.
【0002】[0002]
【従来の技術】原水中の固形分を分離する手段として、
近年は分離膜を用いて固液分離することが行われてい
る。この分離膜を使用した固液分離装置は、処理槽内に
平膜や中空糸膜からなる膜モジュールを浸漬することで
処理が可能なことから、シンプルでコンパクトな装置構
成で確実な固液分離を行えるという利点を有している。2. Description of the Related Art As means for separating solids in raw water,
In recent years, solid-liquid separation has been performed using a separation membrane. A solid-liquid separator using this separation membrane can be treated by immersing a membrane module consisting of a flat membrane or a hollow fiber membrane in the treatment tank. It has the advantage that
【0003】さらに、分離膜だけでは原水中に含まれる
溶解性有機物や臭気成分を除去することができないた
め、原水中に活性炭を投入し、これらを活性炭に吸着さ
せることによって原水中から除去し、活性炭は分離膜で
分離して循環使用することが行われている。Further, since the soluble organic substances and odorous components contained in the raw water cannot be removed only by the separation membrane, activated carbon is introduced into the raw water and adsorbed on the activated carbon to remove it from the raw water. Activated carbon is separated by a separation membrane and reused.
【0004】[0004]
【発明が解決しようとする課題】しかし、膜分離による
固液分離では、膜モジュールのろ過面に固形分が付着し
て堆積するため、膜モジュールを定期的に薬品で洗浄す
る必要があり、活性炭に対しても、膜モジュールとは別
の定期的な再生処理を行う必要があった。しかしなが
ら、この再生処理のために活性炭を膜モジュールから完
全に分離回収することは、実質的に無理であった。However, in solid-liquid separation by membrane separation, solids adhere to and deposit on the filtration surface of the membrane module, so it is necessary to regularly wash the membrane module with chemicals. Against this, it was necessary to perform a periodical regeneration treatment different from the membrane module. However, it was substantially impossible to completely separate and recover the activated carbon from the membrane module for this regeneration treatment.
【0005】また、通常の膜モジュールの薬品洗浄は、
処理槽とは別に設けた洗浄槽に膜モジュールを移して行
うので、水処理システムの複雑化を招く原因となってい
る。さらに、薬品洗浄の際に発生する洗浄廃液やリンス
廃液の処理も必要だった。Further, the normal chemical cleaning of the membrane module is
Since the membrane module is transferred to a cleaning tank provided separately from the treatment tank, this is a cause of complication of the water treatment system. Furthermore, it was necessary to treat the cleaning waste liquid and rinse waste liquid generated during chemical cleaning.
【0006】そこで本発明は、膜モジュールの洗浄処理
と同時に活性炭の再生処理も行うことができ、膜モジュ
ールの寿命延長が図れるだけでなく、処理設備全体にお
ける設備コストや運転コストの低減が図れる膜モジュー
ルの洗浄方法を提供することを目的としている。Therefore, according to the present invention, the cleaning treatment of the membrane module and the regeneration treatment of the activated carbon can be performed at the same time, so that not only the life of the membrane module can be extended but also the facility cost and the operating cost of the entire treatment facility can be reduced. It is intended to provide a method for cleaning a module.
【0007】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本発明の膜モジュールの洗浄方法は、粉末活性炭を
投入した原水の固液分離を行う膜モジュールの洗浄方法
であって、前記原水に過酸化水素を添加して膜モジュー
ルに接触させることを特徴とし、特に、前記原水中の過
酸化水素濃度が10%であることを特徴としている。In order to achieve the above object, a method for cleaning a membrane module of the present invention is a method for cleaning a membrane module in which raw water charged with powdered activated carbon is subjected to solid-liquid separation. It is characterized in that hydrogen peroxide is added and brought into contact with the membrane module, and in particular, the concentration of hydrogen peroxide in the raw water is 10%.
【0008】[0008]
【発明の実施の形態】図1は本発明の洗浄方法を適用し
た膜分離装置の一例を示す概略系統図である。この膜分
離装置は、原水流入管11,活性炭供給装置12を備え
た原水槽13と、原水中の固形分(濁質)を膜ろ過によ
って分離する膜モジュール14と、該膜モジュール14
の前段に設けられた過酸化水素水供給装置15と、膜モ
ジュール14を通過した処理水が流入する処理水槽16
と、膜モジュール14で分離した活性炭を含有する濃縮
水を原水槽13に循環させる活性炭循環駆動装置17及
び循環ライン18とを備えている。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic system diagram showing an example of a membrane separation device to which the cleaning method of the present invention is applied. This membrane separation device comprises a raw water tank 13 equipped with a raw water inflow pipe 11 and an activated carbon supply device 12, a membrane module 14 for separating a solid content (turbidity) in raw water by membrane filtration, and the membrane module 14
Hydrogen peroxide water supply device 15 provided in the previous stage and treated water tank 16 into which the treated water that has passed through the membrane module 14 flows
And a activated carbon circulating drive device 17 and a circulation line 18 for circulating the concentrated water containing activated carbon separated in the membrane module 14 into the raw water tank 13.
【0009】通常の膜分離処理は、活性炭供給装置12
から原水槽13内に所定量の活性炭を投入するととも
に、循環ライン18によって活性炭含有濃縮水を循環さ
せながら行われる。なお、この膜分離処理は、従来から
行われている活性炭循環型膜分離装置と同様にして行う
ことができるので、装置構成や処理条件、その他の詳細
な説明は省略する。The normal membrane separation process is carried out by the activated carbon supply device 12
From the above, a predetermined amount of activated carbon is put into the raw water tank 13, and the circulation line 18 circulates the activated carbon-containing concentrated water. Since this membrane separation treatment can be performed in the same manner as in a conventionally-used activated carbon circulation type membrane separation device, the device configuration, processing conditions, and other detailed description will be omitted.
【0010】前記過酸化水素水供給装置15は、膜モジ
ュール14の洗浄処理を行う際に、過酸化水素水、即ち
過酸化水素と水との混合液を膜モジュール14に流入す
る原水に供給するものであって、過酸化水素水は、自然
落下やポンプを利用して供給することができる。The hydrogen peroxide solution supply device 15 supplies hydrogen peroxide solution, that is, a mixed solution of hydrogen peroxide and water, to the raw water flowing into the membrane module 14 when the membrane module 14 is washed. The hydrogen peroxide solution can be supplied by free fall or by using a pump.
【0011】この過酸化水素水供給装置15から供給す
る過酸化水素水には、一般的に流通している適当な濃度
の過酸化水素水を使用できるが、膜モジュール14に接
触する位置における原水中の過酸化水素濃度は、1〜1
0%の範囲が適当であり、特に洗浄効果やコストを考慮
すると10%程度が最適である。膜洗浄時の過酸化水素
濃度が低いと、膜モジュール14の洗浄に長時間を要し
たり、洗浄を十分に行えなくなることがあり、逆に過酸
化水素濃度を10%を超える高濃度にしても濃度に見合
った洗浄効果を得ることができない。The hydrogen peroxide solution supplied from the hydrogen peroxide solution supply device 15 may be a hydrogen peroxide solution having a suitable concentration that is generally distributed, but the hydrogen peroxide solution at the position contacting the membrane module 14 may be used. Hydrogen peroxide concentration in water is 1 to 1
The range of 0% is suitable, and especially about 10% is optimal considering the cleaning effect and cost. If the hydrogen peroxide concentration during the membrane cleaning is low, it may take a long time to clean the membrane module 14 or the cleaning may not be performed sufficiently. On the contrary, the hydrogen peroxide concentration should be higher than 10%. However, it is not possible to obtain a cleaning effect suitable for the concentration.
【0012】原水中に加えられた過酸化水素は、自ら分
解して酸素を発生し、そのときに生成する酸素の気泡が
膜モジュール14の膜面や活性炭の表面、あるいはその
近傍で破裂すると、この破裂エネルギーによって膜や活
性炭に振動が発生し、膜モジュール14や活性炭を物理
的に洗浄することができる。さらに、生成した酸素の酸
化力により、膜面や活性炭に付着した汚染物質を酸化し
て分解することにより除去するといった化学的な洗浄効
果も期待できる。加えて、過酸化水素の分解や、生成し
た酸素による酸化反応が発熱反応であることから、低水
温時期においても十分な洗浄効果を得ることができる。Hydrogen peroxide added to the raw water decomposes itself to generate oxygen, and when the oxygen bubbles generated at that time burst at the surface of the membrane module 14 or the surface of activated carbon, or in the vicinity thereof, This burst energy causes vibrations in the membrane and activated carbon, and the membrane module 14 and activated carbon can be physically washed. Further, a chemical cleaning effect can be expected, in which contaminants attached to the film surface or activated carbon are removed by being decomposed and decomposed by the oxidizing power of the generated oxygen. In addition, since the decomposition of hydrogen peroxide and the oxidation reaction by the generated oxygen are exothermic reactions, a sufficient cleaning effect can be obtained even in the low water temperature period.
【0013】さらに、原水中に多めに過酸化水素を添加
混合しても、その大部分は分解して酸素と水とになるの
で、従来の薬品を用いたときのような洗浄排水の処理が
不要となる。一方、処理水中に過酸化水素が残留してい
ても、30分程度も経過すれば、その濃度は十分に低く
くなっているので、環境に与える悪影響もなく、人体等
に害を及ぼすおそれも全くない。逆に、処理水中に残留
した微量の過酸化水素によって長時間にわたる殺菌効果
を得ることができる。また、過酸化水素水供給装置15
からの供給量制御を厳密に行う必要もないので、過酸化
水素水供給装置15の設置も低コストで行うことがで
き、既存の設備への適用も容易に行うことができる。Furthermore, even if a large amount of hydrogen peroxide is added to and mixed with the raw water, most of it is decomposed into oxygen and water, so that treatment of cleaning waste water as when using conventional chemicals is possible. It becomes unnecessary. On the other hand, even if hydrogen peroxide remains in the treated water, its concentration becomes sufficiently low after about 30 minutes, so there is no adverse effect on the environment and there is a risk of harm to the human body. Not at all. On the contrary, a trace amount of hydrogen peroxide remaining in the treated water can provide a sterilizing effect for a long time. In addition, the hydrogen peroxide water supply device 15
Since it is not necessary to strictly control the supply amount of the hydrogen peroxide, the hydrogen peroxide solution supply device 15 can be installed at low cost and can be easily applied to existing equipment.
【0014】このように、定期的に過酸化水素を添加し
て膜モジュールの洗浄を行うことにより、膜モジュール
を薬品洗浄する間隔をあけることができるので、使用す
る薬品や洗浄排水の処理を含めた洗浄に要するコストを
低減することができ、薬品によるダメージを軽減して膜
モジュールの寿命を延ばすことができる。さらに、膜モ
ジュールだけでなく活性炭の洗浄再生効果も有している
ので、活性炭の再生処理に要するコストも削減できる。
しかも、過酸化水素を添加した前処理によって膜目詰ま
りの主要原因となる生物性汚物の除去効果も得られ、目
詰まり抑制効果があるので、膜モジュール14における
ろ過効率を高めることができる。As described above, by periodically adding hydrogen peroxide to clean the membrane module, it is possible to set intervals for chemical cleaning of the membrane module. It is possible to reduce the cost required for cleaning, reduce damage caused by chemicals, and extend the life of the membrane module. Further, not only the membrane module but also the effect of cleaning and regenerating the activated carbon can reduce the cost required for the regeneration treatment of the activated carbon.
Moreover, the pretreatment with the addition of hydrogen peroxide also has the effect of removing biological contaminants that are the main cause of membrane clogging, and has the effect of suppressing clogging, so that the filtration efficiency in the membrane module 14 can be increased.
【0015】なお、過酸化水素水供給装置15の設置位
置は任意であり、膜モジュール14に接触する原水中に
所定量の過酸化水素を添加できればよく、配管や流路の
途中、原水槽13等の任意の位置に設けることができ、
膜モジュールの構造によっては、膜モジュールを浸漬、
収納した分離槽に設けることも可能である。The position of the hydrogen peroxide solution supply device 15 is arbitrary, and it is sufficient that a predetermined amount of hydrogen peroxide can be added to the raw water in contact with the membrane module 14, in the middle of the pipe or the flow path, and in the raw water tank 13. Can be provided at any position such as
Depending on the structure of the membrane module, dipping the membrane module,
It is also possible to provide it in the stored separation tank.
【0016】[0016]
【発明の効果】以上説明したように、本発明の膜モジュ
ールの洗浄方法によれば、原水中に添加した過酸化水素
によって膜モジュールの洗浄だけでなく、分解生成した
酸素によって粉末活性炭の再生をも同時に行うことがで
きるので、両者の洗浄、再生処理を効率よく行うことが
できる。また、過酸化水素による洗浄は、薬品洗浄に比
べて膜モジュールに与える悪影響が少ないので、膜モジ
ュールの寿命延長も図れる。さらに、薬品洗浄のときの
ような洗浄排水の処理が不要であり、環境に与える影響
も軽減できる。しかも、過酸化水素の分解や発生した酸
素の反応が発熱反応であるから、低水温時期においても
十分な洗浄効果、再生効果を期待することができる。加
えて、過酸化水素水を供給する簡単な装置を付加するだ
けで実施可能であり、設備コストに大きな影響を与える
こともない。As described above, according to the method for cleaning a membrane module of the present invention, not only the cleaning of the membrane module by the hydrogen peroxide added to the raw water but also the regeneration of the powdered activated carbon by the oxygen produced by decomposition is performed. Since both can be performed at the same time, it is possible to efficiently perform both cleaning and regeneration processing. Further, cleaning with hydrogen peroxide has less adverse effect on the membrane module as compared with chemical cleaning, so that the life of the membrane module can be extended. Furthermore, it is not necessary to treat the cleaning waste water as in the case of chemical cleaning, and the impact on the environment can be reduced. Moreover, since decomposition of hydrogen peroxide and reaction of generated oxygen are exothermic reactions, sufficient cleaning effect and regeneration effect can be expected even at low water temperature. In addition, it can be carried out only by adding a simple device for supplying hydrogen peroxide solution, and does not significantly affect the facility cost.
【図1】 本発明の洗浄方法を適用した膜分離装置の一
例を示す概略系統図である。FIG. 1 is a schematic system diagram showing an example of a membrane separation device to which a cleaning method of the present invention is applied.
11…原水流入管、12…活性炭供給装置、13…原水
槽、14…膜モジュール、15…過酸化水素水供給装
置、16…処理水槽、17…活性炭循環駆動装置、18
…循環ライン11 ... Raw water inflow pipe, 12 ... Activated carbon supply device, 13 ... Raw water tank, 14 ... Membrane module, 15 ... Hydrogen peroxide water supply device, 16 ... Treated water tank, 17 ... Activated carbon circulation drive device, 18
… Circulation line
Claims (2)
行う膜モジュールの洗浄方法であって、前記原水に過酸
化水素を添加して膜モジュールに接触させることを特徴
とする膜モジュールの洗浄方法。1. A method for cleaning a membrane module in which raw water charged with powdered activated carbon is subjected to solid-liquid separation, wherein hydrogen peroxide is added to the raw water and brought into contact with the membrane module. Method.
あることを特徴とする請求項1記載の膜モジュールの洗
浄方法。2. The method for cleaning a membrane module according to claim 1, wherein the concentration of hydrogen peroxide in the raw water is 10%.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2001216849A JP2003024754A (en) | 2001-07-17 | 2001-07-17 | Membrane module washing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001216849A JP2003024754A (en) | 2001-07-17 | 2001-07-17 | Membrane module washing method |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2003024754A true JP2003024754A (en) | 2003-01-28 |
Family
ID=19051268
Family Applications (1)
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JP2001216849A Pending JP2003024754A (en) | 2001-07-17 | 2001-07-17 | Membrane module washing method |
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JP (1) | JP2003024754A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018517546A (en) * | 2015-04-20 | 2018-07-05 | スエズ インテルナシオナール | Apparatus and method for water treatment by contact with adsorbent |
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JPH0871593A (en) * | 1994-09-05 | 1996-03-19 | Japan Organo Co Ltd | Water treatment method |
JPH0975910A (en) * | 1995-09-18 | 1997-03-25 | Kurita Water Ind Ltd | Recovering and regenerating method of waste water |
JPH09174098A (en) * | 1995-12-28 | 1997-07-08 | Ebara Corp | Weight reducing method for organic sludge |
JPH09285787A (en) * | 1996-04-22 | 1997-11-04 | Kurita Water Ind Ltd | Manufacturing device for extrapure water |
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JPH1147747A (en) * | 1997-08-07 | 1999-02-23 | Kurita Water Ind Ltd | Immersion type membrane treatment apparatus |
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2001
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Publication number | Priority date | Publication date | Assignee | Title |
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JPS5849411A (en) * | 1981-09-18 | 1983-03-23 | Asahi Chem Ind Co Ltd | Washing method for ultrafiltering membrane |
JPS60175504A (en) * | 1984-02-22 | 1985-09-09 | Kurita Water Ind Ltd | Method for washing membrane separation apparatus |
JPH0871593A (en) * | 1994-09-05 | 1996-03-19 | Japan Organo Co Ltd | Water treatment method |
JPH0975910A (en) * | 1995-09-18 | 1997-03-25 | Kurita Water Ind Ltd | Recovering and regenerating method of waste water |
JPH09174098A (en) * | 1995-12-28 | 1997-07-08 | Ebara Corp | Weight reducing method for organic sludge |
JPH09285787A (en) * | 1996-04-22 | 1997-11-04 | Kurita Water Ind Ltd | Manufacturing device for extrapure water |
JPH1110136A (en) * | 1997-06-23 | 1999-01-19 | Nippon Gesuido Jigyodan | Process and device for water treatment |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018517546A (en) * | 2015-04-20 | 2018-07-05 | スエズ インテルナシオナール | Apparatus and method for water treatment by contact with adsorbent |
US11097960B2 (en) | 2015-04-20 | 2021-08-24 | Suez International | Method and device for treating water by contact with an adsorbent material |
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