JPH0131403B2 - - Google Patents
Info
- Publication number
- JPH0131403B2 JPH0131403B2 JP59032060A JP3206084A JPH0131403B2 JP H0131403 B2 JPH0131403 B2 JP H0131403B2 JP 59032060 A JP59032060 A JP 59032060A JP 3206084 A JP3206084 A JP 3206084A JP H0131403 B2 JPH0131403 B2 JP H0131403B2
- Authority
- JP
- Japan
- Prior art keywords
- membrane
- hydrogen peroxide
- cleaning
- water
- solution
- 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
Links
- 239000012528 membrane Substances 0.000 claims description 70
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 23
- 238000004140 cleaning Methods 0.000 claims description 21
- 238000000926 separation method Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 11
- 102000016938 Catalase Human genes 0.000 claims description 9
- 108010053835 Catalase Proteins 0.000 claims description 9
- 238000000108 ultra-filtration Methods 0.000 claims description 7
- 238000001223 reverse osmosis Methods 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 24
- 239000000243 solution Substances 0.000 description 13
- -1 polyethylene Polymers 0.000 description 11
- 239000000356 contaminant Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000011109 contamination Methods 0.000 description 4
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 3
- 239000012459 cleaning agent Substances 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 239000002736 nonionic surfactant Substances 0.000 description 3
- 239000011550 stock solution Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 2
- 108090000790 Enzymes Proteins 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- ULUAUXLGCMPNKK-UHFFFAOYSA-N Sulfobutanedioic acid Chemical class OC(=O)CC(C(O)=O)S(O)(=O)=O ULUAUXLGCMPNKK-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001346 alkyl aryl ethers Chemical class 0.000 description 1
- 150000005215 alkyl ethers Chemical class 0.000 description 1
- 150000008051 alkyl sulfates Chemical class 0.000 description 1
- 229940045714 alkyl sulfonate alkylating agent Drugs 0.000 description 1
- 150000008052 alkyl sulfonates Chemical class 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Description
〔発明の利用分野〕
本発明は膜分離装置の洗浄方法に係り、特に膜
分離装置に装着された膜の膜面に析出又は付着し
た汚染物を簡単かつ確実に剥離除去することがで
きる膜分離装置の洗浄方法に関する。
〔従来技術〕
近年、廃水処理、海水の淡水化、純水の製造等
各種の水処理分野において、逆浸透（RO）膜、
限外過（UF）膜又は精密過膜等の選択透過
膜を内蔵した膜分離装置が広く用いられている。
この膜分離装置は、膜で区画された２つの室の一
方（原液供給室）に処理すべき原液を加圧下で導
入し、他方の室（処理液室）から処理水を取り出
すように構成されている。
膜分離装置に装着される膜はエレメントの形状
により、平板型膜、管型膜、渦巻型膜、中空糸型
膜、襞型膜、に大別され、その材質としては、一
般に、酢酸セルロース、ポリスルホン、ポリエチ
レン、ポリプロピレン、ポリアクリロニトリル、
ポリアミド、ポリ塩化ビニル、ポリビニルアルコ
ール、ポリイミド、ポリ酢酸ビニル等が用いられ
ている。
膜分離装置を長時間運転することにより、原液
中に含有される種々の無機物質又は有機物質ある
いはスライム等が膜面に付着し、汚染（フアウリ
ング）させる。しかして、膜汚染により、
膜面が閉塞し、透過水量が低下する（採水量
低下）、
膜分離装置出入口の差圧が増加し、膜エレメ
ントに対する物理的負荷を増す（差圧増加）、
一定量の透過水を得るためには、原水ポンプ
圧を高める必要がでてくる（電力消費増加）、
処理水の水質低下、
汚れによる膜寿命の短縮、
等様々な障害が生起し、膜分離装置の機能を低
下させる。
従つて、膜分離装置の機能回復のために、従
来、酸、アルカリ、酸化剤、還元剤、キレート
剤、酵素等の薬品で膜を洗浄することにより、膜
付着物を溶解、剥離させ除去する方法が、一般に
採用されている。
しかしながら、渦巻型膜エレメント等は通常の
洗浄方法では差圧回復効果が小さい場合が多い。
差圧が十分に回復されないと、再運転の際の差圧
上昇が急激に生じる、透過水量確保のために装置
の運転圧力を上げる必要が生じる、また、膜エレ
メントが変形する等の問題が生起することとな
る。（このような現象は、膜付着物がスライム質
主体である場合には特に顕著である）。これは、
渦巻型では、その構造上、かなりの乱流を与えな
いと膜付着物の除去が十分に行なえないためであ
ると考えられている。このため、気体発生装置に
より、洗浄時に気泡を混入させる方法も検討され
ているが、設備、操作が複雑となり、有効な方法
とは言えない。
その他、汚染した逆浸透膜を過酸化水素溶液で
洗浄しつつ、さらに圧力変動を加えることにより
付着物を除去する方法（特公昭55−37288号）も
提案されているが、短時間とはいえ、モジユール
内の圧力を急激に上下させると、膜が支持体から
剥れたり、装置全体に振動を与える結果膜の劣化
や装置の脆弱化を招いたり、計装上複雑になつた
りする等の問題があり、必ずしも満足すべき方法
とは言えない。
〔発明の目的〕
本発明は上記実情に鑑みてなされたものであ
り、その目的とするところは、膜分離装置の膜に
析出、付着した汚染物質を、極めて効果的に洗浄
除去することができる、膜分離装置の洗浄方法を
提供することにある。
〔発明の構成〕
この目的を達成するために、本発明者は膜の洗
浄方法につき鋭意検討を重ねた結果、洗浄剤によ
り洗浄を実施して膜面の汚染物を剥れ易くした
後、この使用洗浄剤を分解して気泡を発生させる
物質を添加し、気泡により膜面の汚染物を強制的
に剥離させる方法が、洗浄剤を有効かつ簡単に利
用でき、渦巻型膜分離装置の洗浄にも極めて効果
的であることを見い出し、本発明に到達した。
即ち、本発明は
膜分離装置にPHが５〜９で、かつ0.01〜10重量
％の過酸化水素含有液を供給し、次いでカタラー
ゼ含有液を0.1〜５mg／供給することを特徴と
する膜分離装置の洗浄方法、
を要旨とするものである。
以下に本発明につき詳細に説明する。
本発明の洗浄方法においては、まず膜分離装置
に過酸化水素含有液を供給する。過酸化水素含有
液としてはH2O2濃度0.01〜10重量％、好ましく
は0.05〜３重量％の水溶液を用いる。この溶液の
PHは５〜９の範囲とする。濃度やPHがこれらの範
囲をはずれると、気泡の発生量が少なすぎて汚染
物の剥離効果が得られなかつたり、逆に急激に気
泡が発生して膜に悪影響を及ぼしたりするなどの
問題が生じる。
過酸化水素含有液の通液を行なうには、洗浄槽
に過酸化水素含有液を供給し、まずポンプにより
過酸化水素含有液を洗浄槽と膜分離装置に循環通
液し、次いで装置内で膜と過酸化水素含有液とを
静置接触させる。過酸化水素含有液の通液条件と
しては、圧力通常運転圧以下、水量は通常運転水
量の50〜200％、循環接触時間は15〜120分とする
のが好ましい。また、静置接触時間は１〜30時
間、好ましくは６〜24時間が好ましい。
静置接触後、再度過酸化水素含有液を通液循環
する。この際に、過酸化水素含有液に過酸化水素
分解物質であるカタラーゼを添加する。カタラー
ゼの添加量は、カタラーゼ濃度が0.1〜５mg／、
好ましくは0.5〜1.5mg／となるようにする。通
液循環条件としては、前述の初期の通液循環の際
の圧力、水量と同程度で良く、循環接触時間は15
〜60分が好ましい。
洗浄は、膜透過水等の清澄水で水フラツシング
を行ない、装置内を十分に水洗浄して終了する。
水フラツシング条件としては、圧力は通常運転圧
以下、水量は通常運転水量の100〜200％、フラツ
シング時間は５〜30分が好適である。
本発明の方法においては、洗浄効果を高めるた
めに、過酸化水素含有液にアニオン系又はノニオ
ン系界面活性剤を添加するのが好ましい。界面活
性剤の添加量は、その濃度が0.05〜0.3重量％程
度となるようにするのが好ましい。アニオン系界
面活性剤の具体例としては、アルキルベンゼンス
ルホン酸、高級アルコール硫酸エステル、アルキ
ル硫酸エステル、アルキルスルホン酸塩、アルキ
ルスルホコハク酸、ジアルキルスルホコハク酸、
アルキルナフタリンスルホン酸−ホルマリン縮合
物、アルキルナフタリンスルホン酸及びそれらの
塩等が挙げられ、ノニオン系界面活性剤の具体例
としては、ポリオキシエチレンアルキルエーテ
ル、ポリオキシエチレンアルキルアリールエーテ
ル、ポリエチレングリコール脂肪酸エステル、ポ
リオキシエチレン脂肪酸アミドエーテル、多価ア
ルコール脂肪酸エステル、アルキロールアミド等
が挙げられる。
本発明においては、膜汚染物の種類に応じて、
過酸化水素含有液にアルカリ、酸化剤、環元剤、
分散剤、酵素、有機溶媒等その他の添加剤を添加
することもできる。
本発明によれば、まず過酸化水素含有液を膜と
接触させて、膜面の汚染物を剥離し易い状態にさ
せた後、過酸化水素を分解して気泡を発生せしめ
るカタラーゼを添加して、気泡同伴で通液循環さ
せることにより、気泡の乱流効果で汚染物を確実
に剥離除去することができる。
〔発明の実施例〕
以下に本発明を実施例により更に具体的に説明
するが、本発明はその要旨を超えない限り以下の
実施例に限定されるものではない。
実施例 １
市水を活性炭処理、ミツクスベツド処理、UV
殺菌処理した後、日東電気工業株式会社製渦巻型
限外過膜分離装置に、圧力３〜５Kg／cm2、水量
1.5m3／hrで６ケ月間通水処理した。この間、過
酸化水素溶液で１回洗浄を行なつた。
この膜分離装置を、各々下記表１に示す洗浄液
を用い、順次に、通液循環（No.1）（圧力1.0Kg／
cm2、水量800／hr、循環時間15分）→静止接触
（接触時間２時間）→通液循環（No.2）（条件は
No.1の通液循環と同じ）→水フラツシング（フ
ラツシング時間５分）することにより洗浄し、洗
浄後の限外過膜の性能を新品限外過膜及び洗
浄をしない汚染限外過膜の性能と比較した。結
果を表１に示す。
なお、膜の性能は、各々の膜分離装置に、入口
圧1.1Kg／cm2、水量800／hrにおいて30分純水を
通水した後の、膜の差圧を測定することによりテ
ストした。
[Field of Application of the Invention] The present invention relates to a method for cleaning a membrane separation device, and particularly to a membrane separation method that can easily and reliably peel off and remove contaminants deposited or attached to the membrane surface of a membrane installed in a membrane separation device. This invention relates to a method for cleaning equipment. [Prior art] In recent years, reverse osmosis (RO) membranes,
Membrane separation devices incorporating selective permeation membranes such as ultrafiltration (UF) membranes or precision filtration membranes are widely used.
This membrane separator is configured to introduce the stock solution to be treated under pressure into one of two chambers (stock solution supply chamber) separated by a membrane, and take out the treated water from the other chamber (processed solution chamber). ing. Membranes installed in membrane separation equipment are broadly classified into flat membranes, tube membranes, spiral membranes, hollow fiber membranes, and pleated membranes, depending on the shape of the element, and their materials are generally cellulose acetate, polysulfone, polyethylene, polypropylene, polyacrylonitrile,
Polyamide, polyvinyl chloride, polyvinyl alcohol, polyimide, polyvinyl acetate, etc. are used. When a membrane separator is operated for a long time, various inorganic or organic substances, slime, etc. contained in the stock solution adhere to the membrane surface, causing contamination (fouling). As a result, due to membrane contamination, the membrane surface becomes clogged and the amount of permeated water decreases (reduced water collection amount).The differential pressure at the entrance and exit of the membrane separation device increases, increasing the physical load on the membrane element (differential pressure increases). In order to obtain a large amount of permeated water, it becomes necessary to increase the raw water pump pressure (increased power consumption), the quality of the treated water decreases, the membrane lifespan is shortened due to contamination, etc., and various other problems occur. reduce the functionality of Therefore, in order to restore the functionality of membrane separation equipment, membranes are conventionally cleaned with chemicals such as acids, alkalis, oxidizing agents, reducing agents, chelating agents, enzymes, etc. to dissolve and peel off the membrane deposits. methods are commonly employed. However, for spiral membrane elements and the like, the differential pressure recovery effect is often small when using normal cleaning methods.
If the differential pressure is not fully recovered, problems such as a sudden increase in differential pressure when restarting the operation, the need to increase the operating pressure of the device to ensure the amount of permeated water, and deformation of the membrane element may occur. I will do it. (Such a phenomenon is particularly noticeable when the film deposit is mainly slime). this is,
It is thought that this is because, due to the structure of the spiral type, film deposits cannot be removed sufficiently unless considerable turbulence is applied. For this reason, a method of using a gas generator to mix air bubbles during cleaning has been considered, but this method requires complicated equipment and operations and cannot be said to be an effective method. In addition, a method has been proposed (Japanese Patent Publication No. 55-37288) in which the contaminated reverse osmosis membrane is cleaned with a hydrogen peroxide solution and further pressure fluctuations are applied to remove the deposits, but this method is effective for a short period of time. If the pressure inside the module is suddenly increased or decreased, the membrane may peel off from the support, or the entire device may be vibrated, resulting in membrane deterioration, weakening of the device, or complicating the instrumentation. There are problems and it is not necessarily a satisfactory method. [Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to extremely effectively wash and remove contaminants deposited and attached to the membrane of a membrane separation device. An object of the present invention is to provide a method for cleaning a membrane separation device. [Structure of the Invention] In order to achieve this object, the inventor of the present invention made extensive studies on the method of cleaning the membrane, and after cleaning the membrane with a cleaning agent to make it easier to remove contaminants from the membrane surface. The method of adding a substance that decomposes the cleaning agent to generate bubbles and forcibly peeling off the contaminants from the membrane surface with the bubbles allows the cleaning agent to be used effectively and easily, and is effective for cleaning spiral membrane separation equipment. The inventors have also discovered that the method is also extremely effective, and have arrived at the present invention. That is, the present invention provides a membrane separation characterized in that a solution containing hydrogen peroxide having a pH of 5 to 9 and 0.01 to 10% by weight is supplied to a membrane separation device, and then a solution containing catalase is supplied at a rate of 0.1 to 5 mg/. The gist is a method for cleaning equipment. The present invention will be explained in detail below. In the cleaning method of the present invention, first, a hydrogen peroxide-containing liquid is supplied to the membrane separation device. As the hydrogen peroxide-containing liquid, an aqueous solution having an H 2 O 2 concentration of 0.01 to 10% by weight, preferably 0.05 to 3% by weight is used. of this solution
The pH is in the range of 5-9. If the concentration or pH is outside these ranges, problems may occur, such as the amount of bubbles generated is too small to be effective in removing contaminants, or conversely, bubbles may be generated suddenly and have an adverse effect on the membrane. arise. To pass a hydrogen peroxide-containing solution, first supply the hydrogen peroxide-containing solution to the cleaning tank, first circulate the hydrogen peroxide-containing solution through the cleaning tank and the membrane separation device using a pump, and then circulate the hydrogen peroxide-containing solution inside the device. The membrane and the hydrogen peroxide-containing solution are brought into static contact. The conditions for passing the hydrogen peroxide-containing liquid are preferably such that the pressure is below the normal operating pressure, the amount of water is 50 to 200% of the normal operating water amount, and the circulation contact time is 15 to 120 minutes. Further, the standing contact time is preferably 1 to 30 hours, preferably 6 to 24 hours. After the stationary contact, the hydrogen peroxide-containing solution is passed through and circulated again. At this time, catalase, which is a hydrogen peroxide decomposition substance, is added to the hydrogen peroxide-containing solution. The amount of catalase added is such that the concentration of catalase is 0.1 to 5 mg/,
The amount is preferably 0.5 to 1.5 mg/. The liquid circulation conditions should be the same as the pressure and water volume during the initial liquid circulation described above, and the circulation contact time should be 15
~60 minutes is preferred. Cleaning is completed by flushing with clear water such as membrane-permeated water and thoroughly washing the inside of the device with water.
Suitable conditions for water flushing are that the pressure is below the normal operating pressure, the amount of water is 100 to 200% of the amount of normal operating water, and the flushing time is 5 to 30 minutes. In the method of the present invention, it is preferable to add an anionic or nonionic surfactant to the hydrogen peroxide-containing liquid in order to enhance the cleaning effect. The amount of surfactant added is preferably such that its concentration is approximately 0.05 to 0.3% by weight. Specific examples of anionic surfactants include alkylbenzene sulfonic acids, higher alcohol sulfates, alkyl sulfates, alkyl sulfonates, alkyl sulfosuccinic acids, dialkyl sulfosuccinic acids,
Examples of nonionic surfactants include alkylnaphthalene sulfonic acid-formalin condensates, alkylnaphthalene sulfonic acids and their salts, and specific examples of nonionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkylaryl ether, and polyethylene glycol fatty acid ester. , polyoxyethylene fatty acid amide ether, polyhydric alcohol fatty acid ester, alkylol amide, and the like. In the present invention, depending on the type of membrane contaminant,
Hydrogen peroxide-containing liquid contains alkali, oxidizing agent, ring agent,
Other additives such as dispersants, enzymes, and organic solvents can also be added. According to the present invention, first, a hydrogen peroxide-containing solution is brought into contact with the membrane to make it easier to remove contaminants from the membrane surface, and then catalase, which decomposes hydrogen peroxide and generates bubbles, is added. By circulating the liquid with air bubbles, contaminants can be reliably peeled off and removed by the turbulent flow effect of the air bubbles. [Examples of the Invention] The present invention will be explained in more detail by Examples below, but the present invention is not limited to the following Examples unless the gist thereof is exceeded. Example 1 City water treated with activated carbon, mixed bed treatment, and UV
After sterilization, the water was placed in a spiral type ultrafiltration membrane separator manufactured by Nitto Electric Industry Co., Ltd. at a pressure of 3 to 5 kg/cm 2 and a water volume.
Water was passed for 6 months at a rate of 1.5 m 3 /hr. During this time, washing was performed once with a hydrogen peroxide solution. This membrane separator was sequentially cleaned using the cleaning solutions shown in Table 1 below (No. 1) (pressure 1.0Kg/
cm 2 , water flow rate 800/hr, circulation time 15 minutes) → static contact (contact time 2 hours) → liquid circulation (No. 2) (conditions are
Same as No. 1 liquid circulation) → Clean by water flushing (flushing time 5 minutes), and compare the performance of the ultrafiltration membrane after cleaning with that of the new ultrafiltration membrane and the contaminated ultrafiltration membrane without cleaning. compared with performance. The results are shown in Table 1. The performance of the membrane was tested by measuring the differential pressure across the membrane after passing pure water through each membrane separation device for 30 minutes at an inlet pressure of 1.1 Kg/cm 2 and a water flow rate of 800/hr.
以上詳述した如く、本発明の膜分離装置の洗浄
方法は、H2O2で膜に付着したスケール、スライ
ム類等を剥れ易くし、次いで、カタラーゼを添加
してH2O2を分解し、気泡を発生させることによ
り付着物を膜から強制剥離するようにしたもので
あり、膜面に析出、付着した汚染物を容易かつ確
実に除去することができる。しかして、従来、薬
品洗浄のみでは除去困難であつたスライム質等の
除去にも有効であり、また渦巻型膜エレメントの
洗浄にも極めて有効である。従つて、本発明の方
法によれば、簡単な方法で確実に、膜汚染による
差圧上昇等の障害を回復することができ、工業的
に極めて有利である。
As detailed above, the method for cleaning a membrane separation device of the present invention involves using H 2 O 2 to make scale, slime, etc. attached to the membrane easier to peel off, and then adding catalase to decompose the H 2 O 2 . However, by generating bubbles, the deposits are forcibly peeled off from the membrane, and the contaminants deposited and attached to the membrane surface can be easily and reliably removed. Therefore, it is effective in removing slime, etc., which has conventionally been difficult to remove by chemical cleaning alone, and is also extremely effective in cleaning spiral membrane elements. Therefore, according to the method of the present invention, it is possible to reliably recover from problems such as an increase in differential pressure due to membrane contamination in a simple manner, which is extremely advantageous industrially.
Claims (1)
重量％の過酸化水素含有液を供給し、次いでカタ
ラーゼ含有液を0.1〜５mg／供給することを特
徴とする膜分離装置の洗浄方法。 ２ 膜分離装置は逆浸透膜又は限外過膜を装着
したものであることを特徴とする特許請求の範囲
第１項に記載の方法。 ３ 過酸化水素含有液が界面活性剤を含有するこ
とを特徴とする特許請求の範囲第１項又は第２項
に記載の方法。 ４ カタラーゼ含有液は過酸化水素含有液にカタ
ラーゼを添加してなることを特徴とする特許請求
の範囲第１項ないし第３項のいずれかに記載の方
法。[Claims] 1. The membrane separator has a pH of 5 to 9 and 0.01 to 10.
1. A method for cleaning a membrane separation device, which comprises supplying a solution containing hydrogen peroxide in a weight percent range, and then supplying a solution containing catalase at 0.1 to 5 mg/wt. 2. The method according to claim 1, wherein the membrane separation device is equipped with a reverse osmosis membrane or an ultrafiltration membrane. 3. The method according to claim 1 or 2, wherein the hydrogen peroxide-containing liquid contains a surfactant. 4. The method according to any one of claims 1 to 3, wherein the catalase-containing solution is obtained by adding catalase to a hydrogen peroxide-containing solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3206084A JPS60175504A (en) | 1984-02-22 | 1984-02-22 | Method for washing membrane separation apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3206084A JPS60175504A (en) | 1984-02-22 | 1984-02-22 | Method for washing membrane separation apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60175504A JPS60175504A (en) | 1985-09-09 |
| JPH0131403B2 true JPH0131403B2 (en) | 1989-06-26 |
Family
ID=12348334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3206084A Granted JPS60175504A (en) | 1984-02-22 | 1984-02-22 | Method for washing membrane separation apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60175504A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2514933B2 (en) * | 1986-06-11 | 1996-07-10 | オルガノ株式会社 | Method for cleaning hollow fiber modules |
| JPH0722752B2 (en) * | 1987-04-30 | 1995-03-15 | 栗田工業株式会社 | Wafer process wastewater treatment method |
| JPH0747101B2 (en) * | 1991-08-15 | 1995-05-24 | 丸善石油化学株式会社 | How to regenerate a clogged filter |
| JP4536227B2 (en) * | 2000-08-01 | 2010-09-01 | 三菱レイヨン株式会社 | Handling method of membrane module |
| JP2003024754A (en) * | 2001-07-17 | 2003-01-28 | Maezawa Ind Inc | Membrane module washing method |
| WO2007029291A1 (en) * | 2005-09-01 | 2007-03-15 | Novel Technology Co., Ltd | Separation membrane cleaning composition |
| JP6728382B2 (en) * | 2015-12-16 | 2020-07-22 | エコラブ ユーエスエイ インク | Peroxyformic acid composition for membrane filtration purification |
| EP3442334B9 (en) | 2016-04-15 | 2023-08-02 | Ecolab USA Inc. | Performic acid biofilm prevention for industrial co2 scrubbers |
| WO2018111341A1 (en) | 2016-12-15 | 2018-06-21 | Ecolab Usa Inc. | Peroxyformic acid compositions for membrane filtration cleaning in energy services |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54162684A (en) * | 1978-06-14 | 1979-12-24 | Ebara Infilco Co Ltd | Preliminary treating method for contaminated membrane |
-
1984
- 1984-02-22 JP JP3206084A patent/JPS60175504A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54162684A (en) * | 1978-06-14 | 1979-12-24 | Ebara Infilco Co Ltd | Preliminary treating method for contaminated membrane |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60175504A (en) | 1985-09-09 |
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