JPH11128919A - Treatment of reverse osmosis membrane - Google Patents
Treatment of reverse osmosis membraneInfo
- Publication number
- JPH11128919A JPH11128919A JP9295565A JP29556597A JPH11128919A JP H11128919 A JPH11128919 A JP H11128919A JP 9295565 A JP9295565 A JP 9295565A JP 29556597 A JP29556597 A JP 29556597A JP H11128919 A JPH11128919 A JP H11128919A
- Authority
- JP
- Japan
- Prior art keywords
- water
- membrane
- reverse osmosis
- osmosis membrane
- membrane separation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/138—Water desalination using renewable energy
- Y02A20/144—Wave energy
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は逆浸透膜（ＲＯ膜）
処理方法に係り、特に、ＲＯ膜分離装置の運転を停止す
ることなく、ＲＯ膜分離装置の生産水量の低下や差圧上
昇の要因となる膜汚染物を効果的に洗浄除去することが
できるＲＯ膜分離方法に関する。TECHNICAL FIELD The present invention relates to a reverse osmosis membrane (RO membrane).
According to the treatment method, in particular, an RO that can effectively remove and remove membrane contaminants that cause a reduction in the amount of water produced by the RO membrane separation device and an increase in differential pressure without stopping the operation of the RO membrane separation device. The present invention relates to a membrane separation method.
【０００２】[0002]
【従来の技術】近年、市水、井水等の脱塩方法として、
ＲＯ膜処理法が広く採用されている。2. Description of the Related Art In recent years, as a desalination method for city water, well water, and the like,
The RO film processing method is widely used.
【０００３】このＲＯ膜処理では、ＲＯ膜分離装置の運
転を継続することにより、ＲＯ膜に付着、堆積した膜汚
染物により膜性能が低下し、生産水（膜透過水）量の低
下や差圧の上昇が起こる。In this RO membrane treatment, by continuing the operation of the RO membrane separation apparatus, the membrane performance is reduced due to the membrane contaminants attached to and deposited on the RO membrane, and the amount of produced water (membrane permeated water) is reduced or reduced. An increase in pressure occurs.
【０００４】この膜汚染物は、鉄やアルミニウム等の金
属水酸化物、微生物のスライム、界面活性剤や高分子凝
集剤等の有機物質、或いは、シリカや炭酸カルシウム等
のスケール等であり、膜汚染で性能が低下したＲＯ膜
は、当該汚染物に応じた薬品を用いる薬品洗浄で汚染物
を洗浄除去することで性能を回復させることができる
（「超純水の科学」リアライズ社第２７４頁〜第２７７
頁）。The film contaminants include metal hydroxides such as iron and aluminum, microorganism slime, organic substances such as surfactants and polymer flocculants, and scales such as silica and calcium carbonate. The performance of the RO film, whose performance has been reduced due to contamination, can be restored by cleaning and removing the contaminants by chemical cleaning using a chemical corresponding to the contaminants ("Ultra Pure Water Science" Realize Inc., p. 274). To 277
page).
【０００５】この膜洗浄法として、特開平７−１６５６
６号公報には、ＲＯ膜等の分離膜をアルカリ洗浄するこ
とが記載されている。また、特公昭５２−１０７８５号
公報には、ＲＯ膜分離装置にｐＨ９〜１３のアルカリ水
を短時間通水することにより膜汚染物を洗浄除去する方
法が記載されている。[0005] As this film cleaning method, Japanese Patent Application Laid-Open No.
No. 6 describes that a separation membrane such as an RO membrane is washed with an alkali. Japanese Patent Publication No. 52-10785 discloses a method of washing and removing membrane contaminants by passing alkaline water having a pH of 9 to 13 through a RO membrane separation apparatus for a short time.
【０００６】[0006]
【発明が解決しようとする課題】従来の膜洗浄方法は、
ＲＯ膜分離装置の運転を一旦停止し、別途設けた薬品洗
浄用の循環タンクで、予め調整した洗浄薬品をＲＯ膜分
離装置に循環通水するものであるため、洗浄運転時には
膜透過水を得ることができない、洗浄操作が煩雑であ
る、装置が複雑であるといった欠点がある。A conventional method for cleaning a membrane is as follows.
The operation of the RO membrane separation device is temporarily stopped, and a previously prepared cleaning chemical is circulated and passed through the RO membrane separation device in a separately provided circulation tank for chemical cleaning, so that the membrane permeated water is obtained during the cleaning operation. However, there are drawbacks such as inability to perform such operations, complicated cleaning operations, and complicated devices.
【０００７】特公昭５２−１０７８５号公報には、ｐＨ
調整前のアルカリ性の被処理液を洗浄水として使用し得
ることが記載されているが、やはり採水運転と洗浄運転
とを交互に行うものであり、洗浄運転中には膜透過水を
得ることができないという欠点がある。[0007] Japanese Patent Publication No. 52-10785 discloses pH
Although it is described that an alkaline liquid to be treated before adjustment can be used as washing water, water sampling operation and washing operation are performed alternately, and it is necessary to obtain membrane permeated water during washing operation. There is a drawback that you can not.
【０００８】本発明は上記従来の問題点を解決し、ＲＯ
膜分離装置の運転を停止することなく、即ち採水を継続
して、ＲＯ膜分離装置の生産水量の低下や差圧上昇の要
因となる膜汚染物を効果的に洗浄除去することができる
ＲＯ膜処理方法を提供することを目的とする。[0008] The present invention solves the above-mentioned conventional problems and provides an RO
An RO that can effectively wash and remove membrane contaminants that can cause a reduction in the amount of water produced by the RO membrane separation device and an increase in differential pressure without stopping the operation of the membrane separation device, that is, by continuing water sampling An object of the present invention is to provide a film processing method.
【０００９】[0009]
【課題を解決するための手段】本発明のＲＯ膜処理方法
は、ＲＯ膜分離装置に原水を供給し、膜透過水を処理水
として取り出すＲＯ膜処理方法において、ＲＯ膜分離装
置の連続運転中にＲＯ膜分離装置に供給される原水のｐ
Ｈを一時的に１０〜１２とするｐＨ調整を行い、該ｐＨ
調整中も膜透過水を処理水として取り出すことを特徴と
する。The RO membrane treatment method of the present invention is a RO membrane treatment method in which raw water is supplied to an RO membrane separation device and membrane permeated water is taken out as treated water. Of raw water supplied to RO membrane separator
H was temporarily adjusted to 10 to 12 and the pH was adjusted.
It is characterized in that the membrane permeated water is taken out as treated water even during the adjustment.
【００１０】ＲＯ膜分離装置にｐＨ１０〜１２のアルカ
リ性の水を通水することにより、膜汚染物、特に、スラ
イムや有機物等の膜汚染物を効果的に洗浄除去して膜性
能を維持することができる。[0010] Membrane contaminants, particularly membrane contaminants such as slime and organic matter, are effectively washed and removed to maintain the membrane performance by passing alkaline water having a pH of 10 to 12 through the RO membrane separation apparatus. Can be.
【００１１】本発明では、ＲＯ膜分離装置の運転中に一
定の頻度で原水にアルカリを添加して給水すれば良く、
洗浄用の循環タンクなどは不要である。また、このｐＨ
調整中も膜透過水を処理水として採水するため、生産水
量を高く維持することができる。In the present invention, it is only necessary to add alkali to the raw water at a certain frequency during the operation of the RO membrane separation apparatus to supply water.
No circulating tank for cleaning is required. In addition, this pH
Since the membrane permeated water is sampled as treated water even during the adjustment, the amount of produced water can be kept high.
【００１２】本発明において、上記ｐＨ調整は３〜１０
日に一度の頻度で、１５〜３００分間行うのが好まし
い。In the present invention, the pH adjustment is 3-10.
It is preferably performed once a day for 15 to 300 minutes.
【００１３】このようにｐＨ調整中も採水を維持するこ
とで処理水の水質が低下する恐れがあるが、ＲＯ膜分離
装置の後段にイオン交換装置を設け、ＲＯ膜透過水をイ
オン交換処理することにより、処理水質を維持すること
ができる。Although the quality of the treated water may be deteriorated by maintaining the water sampling even during the pH adjustment as described above, an ion exchange device is provided at the subsequent stage of the RO membrane separation device, and the RO membrane permeated water is subjected to the ion exchange treatment. By doing so, the quality of the treated water can be maintained.
【００１４】[0014]
【発明の実施の形態】以下に図面を参照して本発明の実
施の形態を詳細に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【００１５】図１は本発明のＲＯ膜処理方法の実施の形
態を示す系統図である。FIG. 1 is a system diagram showing an embodiment of an RO film processing method according to the present invention.
【００１６】この方法は、原水、例えば工業用水、市
水、井水等の凝集、加圧浮上、濾過処理水をＲＯ膜分離
装置１及びイオン交換装置２に順次通水して処理する装
置に本発明方法を適用したものであり、原水の供給ライ
ンには、アルカリタンク３Ａ及び薬注ポンプ３Ｂよりな
るアルカリ注入手段３と、酸タンク４Ａ及び薬注ポンプ
４Ｂよりなる酸注入手段４と、攪拌機（スタティックミ
キサー）５と、ｐＨ計６が設けられると共に、ｐＨの自
動制御のためのＰＩＤ調節計７及びシーケンサ８が設け
られている。This method is applied to an apparatus for treating raw water, for example, industrial water, city water, well water, etc., by aggregating, floating under pressure, and passing filtered water through an RO membrane separation apparatus 1 and an ion exchange apparatus 2 sequentially. The method of the present invention is applied, and the raw water supply line includes an alkali injection means 3 including an alkali tank 3A and a chemical injection pump 3B, an acid injection means 4 including an acid tank 4A and a chemical injection pump 4B, and a stirrer. A (static mixer) 5 and a pH meter 6 are provided, and a PID controller 7 and a sequencer 8 for automatic pH control are provided.
【００１７】ＲＯ膜分離装置１でのＲＯ膜分離処理にお
いては、原水ＲＯ給水のｐＨによりＲＯ生産水（膜透過
水）の水質、例えば電気伝導度が大きく影響を受けるた
め、給水のｐＨが一定になるように、アルカリ添加手段
３又は酸添加手段４により、ＮａＯＨ等のアルカリ又は
Ｈ2ＳＯ4、ＨＣｌ等の酸を添加してｐＨ調整を行う。In the RO membrane separation process in the RO membrane separation apparatus 1, since the quality of the RO production water (membrane permeated water), for example, the electrical conductivity is greatly affected by the pH of the raw water RO feedwater, the pH of the feedwater is kept constant. The pH is adjusted by adding an alkali such as NaOH or an acid such as H 2 SO 4 or HCl by the alkali addition means 3 or the acid addition means 4.
【００１８】例えば、工業用水を凝集、加圧浮上、濾過
して得られる水（電気伝導度２００μＳ／ｃｍ）をＲＯ
給水とする場合、ｐＨ７に調整してＲＯ膜分離装置１に
供給する場合、得られるＲＯ生産水の電気伝導度は５μ
Ｓ／ｃｍであり、ｐＨ１０に調整してＲＯ給水とした場
合のＲＯ生産水の電気伝導度は２５μＳ／ｃｍである。For example, water (electrical conductivity: 200 μS / cm) obtained by coagulating, floating under pressure, and filtering industrial water is subjected to RO
In the case of water supply, when the pH is adjusted to 7 and supplied to the RO membrane separation device 1, the obtained RO produced water has an electric conductivity of 5 μm.
S / cm, and the electrical conductivity of RO production water when adjusted to pH 10 and used as RO water supply is 25 μS / cm.
【００１９】従って、ＲＯ生産水の水質の面からはＲＯ
給水は、ｐＨ７程度の中性条件とするのが好ましい。Therefore, from the viewpoint of the quality of RO produced water, RO
It is preferable to supply water under neutral conditions of about pH 7.
【００２０】ｐＨ７程度の中性条件で給水を行って運転
を行った場合、経時的にＲＯ膜面にスライム等の膜汚染
物が付着し、ＲＯ生産水量の低減、差圧の上昇が起こる
場合がある。When the operation is performed by supplying water under a neutral condition of about pH 7, when a membrane contaminant such as slime adheres to the RO membrane surface with time, the amount of RO production water decreases, and the differential pressure increases. There is.
【００２１】本発明では、このような膜汚染物による膜
性能の低下を防止するために、定期的にＲＯ給水のｐＨ
を１０〜１２のアルカリ性とする。In the present invention, in order to prevent the membrane performance from deteriorating due to such membrane contaminants, the pH of the RO feed water is periodically checked.
Is 10 to 12 alkaline.
【００２２】このようにＲＯ給水のｐＨを１０〜１２の
アルカリ性とすることにより、膜汚染物、特に、スライ
ムや有機物等の膜汚染物を効果的に洗浄除去して膜性能
を高めることができる。By making the pH of the RO feed water alkaline in the range of 10 to 12 as described above, membrane contaminants, in particular, membrane contaminants such as slime and organic substances can be effectively washed and removed to improve membrane performance. .
【００２３】このＲＯ給水のｐＨを１０〜１２のアルカ
リ性に調整する頻度及び期間は、特に３〜１０日に一度
の割合で１５〜３００分間とするのが好ましく、このよ
うな条件で定期的なｐＨ調整を行うことにより、膜汚染
物の蓄積を未然に防止して、アルカリ性のＲＯ給水によ
り効果的に膜汚染物の洗浄除去を行うことができる。The frequency and duration of adjusting the pH of the RO feed water to an alkaline pH of 10 to 12 is preferably 15 to 300 minutes, particularly once every 3 to 10 days. By adjusting the pH, the accumulation of membrane contaminants can be prevented beforehand, and the membrane contaminants can be effectively washed and removed by alkaline RO water supply.
【００２４】なお、洗浄間隔は短い程、また、洗浄時間
は長い程、洗浄効果がある反面、その期間の水質が低下
する。従って、洗浄時間は短い程良い。The shorter the cleaning interval and the longer the cleaning time, the more effective the cleaning, but the lower the water quality during that period. Therefore, the shorter the cleaning time, the better.
【００２５】本実施の形態においては、リモート入力型
のＰＩＤ調節計７を用い、例えば１６８時間（１週間）
に１回の割合で３時間、ＲＯ給水のｐＨを１０とし、そ
の他はｐＨ７とするように、ＲＯ給水のｐＨ調整条件を
プログラミングしたシーケンサ８から制御信号を出力し
て自動制御にてＲＯ給水のｐＨ調整を行う。In this embodiment, the remote input type PID controller 7 is used, for example, for 168 hours (one week).
The control signal is output from the sequencer 8 in which the pH adjustment condition of the RO feedwater is programmed so that the pH of the RO feedwater is set to 10 and the pH of the other is set to 7 for 3 hours at a time, and the RO feedwater is automatically controlled. Adjust the pH.
【００２６】本発明においては、このｐＨ調整期間中も
処理水としての膜透過水の取り出しを継続する。In the present invention, the removal of the permeated water as the treated water is continued even during the pH adjustment period.
【００２７】ＲＯ給水のｐＨを１０〜１２のアルカリ性
とすると、膜透過水の水質は低下し、例えば電気伝導度
は２５μＳ／ｃｍとなるが、本実施の形態では、膜透過
水を更にイオン交換装置２でイオン交換処理するため、
得られる処理水（イオン交換水）の水質は殆ど影響を受
けることはなく、高水質を維持できる（例えば、電気伝
導度で０．６６７μＳ／ｃｍ以下）。When the pH of the RO feed water is set to be alkaline of 10 to 12, the quality of the water permeated through the membrane is reduced, for example, the electric conductivity becomes 25 μS / cm. In this embodiment, the water permeated through the membrane is further ion-exchanged. In order to perform the ion exchange treatment in the device 2,
The quality of the obtained treated water (ion-exchanged water) is hardly affected, and high water quality can be maintained (for example, 0.667 μS / cm or less in electrical conductivity).
【００２８】なお、アルカリ性のＲＯ給水を行った時の
膜透過水もイオン交換装置２に通水することで、イオン
交換装置２の負荷が増大し、イオン交換樹脂の再生頻度
は若干高くなることが予想されるが、この負荷の増大は
一時的なものであるため、再生頻度を大きく悪化させる
ことはない。The membrane permeated water when alkaline RO water is supplied also flows through the ion exchange device 2, so that the load on the ion exchange device 2 is increased and the frequency of regeneration of the ion exchange resin is slightly increased. However, since the increase in load is temporary, the reproduction frequency is not significantly deteriorated.
【００２９】なお、このイオン交換装置２としては、混
床型又は多床型イオン交換装置（非再生型であっても良
い。）等各種のものを用いることができる。また、イオ
ン交換装置の他、ＲＯ膜分離装置等の脱塩装置であって
も良く、これらの組み合わせであっても良い。負荷変動
に対応する点からはイオン交換装置が好適である。As the ion exchange device 2, various types such as a mixed-bed type or a multi-bed type ion exchange device (which may be a non-regeneration type) can be used. Further, in addition to the ion exchange device, a desalination device such as an RO membrane separation device may be used, or a combination thereof may be used. An ion exchange device is preferred from the point of responding to load fluctuation.
【００３０】このような本発明のＲＯ膜処理方法は、特
にスライム等の膜汚染物が付着し易い原水のＲＯ膜分離
処理に有効である。The RO membrane treatment method of the present invention is particularly effective for the RO membrane separation treatment of raw water to which membrane contaminants such as slime tend to adhere.
【００３１】[0031]
【実施例】以下に実施例及び比較例を挙げて本発明をよ
り具体的に説明する。The present invention will be described more specifically below with reference to examples and comparative examples.
【００３２】実施例１ 図１に示す方法に従って、ＲＯ膜分離処理を行った。原
水としては、工業用水の凝集、加圧浮上、濾過処理水を
用い、ＲＯ膜分離装置（日東電工（株）製４インチＲＯ
膜「ＮＴＲ−７５９ＨＲ」）に運転圧力１６ｋｇ／ｃｍ
2、回収率７０％で通水した。Example 1 An RO membrane separation treatment was performed according to the method shown in FIG. As raw water, industrial water agglomeration, pressure flotation, and filtration treatment water are used, and an RO membrane separation device (4 inch RO manufactured by Nitto Denko Corporation) is used.
Operating pressure of 16 kg / cm for membrane “NTR-759HR”)
2. Water was passed at a recovery rate of 70%.
【００３３】また、混床型イオン交換装置としては、陰
イオン交換樹脂（栗田工業（株）製「ＥＸＡＧ」）と陽
イオン交換樹脂（栗田工業（株）製「ＥＸＣＧ」）とを
２：１で混合したものを用い、ＳＶ＝５０ｈｒ-1で通水
した。As the mixed bed type ion exchange apparatus, an anion exchange resin (“EXAG” manufactured by Kurita Kogyo Co., Ltd.) and a cation exchange resin (“EXCG” manufactured by Kurita Kogyo Co., Ltd.) are used in a ratio of 2: 1. And water was passed at SV = 50 hr -1 .
【００３４】ＲＯ給水のｐＨは通常時は７．０の中性条
件とし、１６８時間に一回の頻度で３時間、ＲＯ給水の
ｐＨを１０．０のアルカリ性とし、このアルカリ性にｐ
Ｈ調整する間も、採水を行った。The pH of the RO feedwater is usually set to a neutral condition of 7.0, and the pH of the RO feedwater is set to be alkaline at 10.0 once every 168 hours for 3 hours.
Water was sampled during H adjustment.
【００３５】ＲＯ生産水（膜透過水）量（２５℃換算）
の経時変化及びこの通水期間中の処理水（膜透過水のイ
オン交換水）の平均水質（電気伝導度）を調べ、結果を
表１に示した。RO production water (membrane permeated water) amount (converted to 25 ° C.)
And the average water quality (electric conductivity) of the treated water (membrane permeated water ion-exchanged water) during the water passage period was examined. The results are shown in Table 1.
【００３６】比較例１ 実施例１において、ＲＯ給水のｐＨを常時７．０の一定
ｐＨとしたこと以外は同様にして通水を行い、ＲＯ生産
水量の経時変化及び処理水の平均水質を調べ、結果を表
１に示した。Comparative Example 1 In Example 1, water was supplied in the same manner as in Example 1 except that the pH of the RO feed water was always kept at a constant pH of 7.0, and the change over time in the amount of RO produced water and the average quality of treated water were examined. The results are shown in Table 1.
【００３７】[0037]
【表１】 [Table 1]
【００３８】表１より明らかなように、定期的にＲＯ給
水をアルカリ性とすることにより、膜性能の低下を防止
して、長期に亘り安定な処理を行える。しかも、後段に
イオン交換装置を設けることにより、アルカリ性のＲＯ
給水を通水することによる処理水の水質低下を防止する
ことができる。As is evident from Table 1, by periodically making the RO feed water alkaline, it is possible to prevent a decrease in membrane performance and to carry out a stable treatment for a long period of time. Moreover, by providing an ion exchange device at the subsequent stage, alkaline RO
It is possible to prevent a decrease in the quality of the treated water caused by passing the supplied water.
【００３９】[0039]
【発明の効果】以上詳述した通り、本発明のＲＯ膜処理
方法によれば、ＲＯ膜分離装置の運転を停止することな
く、即ち採水を継続して、ＲＯ膜分離装置の生産水量の
低下や差圧上昇の要因となる膜汚染物を効果的に洗浄除
去することができる。As described above in detail, according to the RO membrane treatment method of the present invention, the operation of the RO membrane separation apparatus is not stopped, that is, water sampling is continued, and the production water volume of the RO membrane separation apparatus is reduced. Film contaminants that cause a decrease and a differential pressure increase can be effectively removed by washing.
【図１】本発明のＲＯ膜処理方法の実施の形態を示す系
統図である。FIG. 1 is a system diagram showing an embodiment of an RO film processing method of the present invention.
１ ＲＯ膜分離装置 ２ イオン交換装置 ３ アルカリ注入手段 ３Ａ アルカリタンク ３Ｂ，４Ｂ 薬注ポンプ ４ 酸注入手段 ４Ａ 酸タンク ５ 攪拌機 ６ ｐＨ計 ７ ＰＩＤ調節計 ８ シーケンサ DESCRIPTION OF SYMBOLS 1 RO membrane separation apparatus 2 Ion exchange apparatus 3 Alkali injection means 3A Alkaline tank 3B, 4B Chemical pump 4 Acid injection means 4A Acid tank 5 Stirrer 6 pH meter 7 PID controller 8 Sequencer
Claims (3)
過水を処理水として取り出す逆浸透膜処理方法におい
て、 逆浸透膜分離装置の連続運転中に逆浸透膜分離装置に供
給される原水のｐＨを一時的に１０〜１２とするｐＨ調
整を行い、該ｐＨ調整中も膜透過水を処理水として取り
出すことを特徴とする逆浸透膜処理方法。1. A reverse osmosis membrane treatment method in which raw water is supplied to a reverse osmosis membrane separation device and membrane permeated water is taken out as treated water, wherein the raw water is supplied to the reverse osmosis membrane separation device during continuous operation of the reverse osmosis membrane separation device. A method for treating a reverse osmosis membrane, wherein a pH of raw water is temporarily adjusted to 10 to 12 and a permeated water is taken out as a treated water even during the pH adjustment.
０日に一度の頻度で１５〜３００分間行うことを特徴と
する逆浸透膜処理方法。2. The method according to claim 1, wherein the pH is adjusted to 3 to 1.
A reverse osmosis membrane treatment method, which is performed once every 0 days for 15 to 300 minutes.
イオン交換処理することを特徴とする逆浸透膜処理方
法。3. The method for treating a reverse osmosis membrane according to claim 1, wherein the permeated water is subjected to an ion exchange treatment.
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|---|---|---|---|
| JP29556597A JP3944973B2 (en) | 1997-10-28 | 1997-10-28 | Reverse osmosis membrane treatment method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29556597A JP3944973B2 (en) | 1997-10-28 | 1997-10-28 | Reverse osmosis membrane treatment method |
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| Publication Number | Publication Date |
|---|---|
| JPH11128919A true JPH11128919A (en) | 1999-05-18 |
| JP3944973B2 JP3944973B2 (en) | 2007-07-18 |
Family
ID=17822295
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|---|---|---|---|
| JP29556597A Expired - Fee Related JP3944973B2 (en) | 1997-10-28 | 1997-10-28 | Reverse osmosis membrane treatment method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007125526A (en) * | 2005-11-07 | 2007-05-24 | Kurita Water Ind Ltd | Operation method of reverse osmosis membrane separator |
| WO2011068027A1 (en) * | 2009-12-02 | 2011-06-09 | 三菱重工業株式会社 | Method for cleaning filtration membrane |
| JP2013514067A (en) * | 2009-12-17 | 2013-04-25 | ヴィンターズハル、ホールディング、ゲゼルシャフト、ミット、ベシュレンクテル、ハフツング | Method for preparing homopolysaccharide |
| JP2016221480A (en) * | 2015-06-02 | 2016-12-28 | 株式会社東芝 | Water treatment system, pH adjustment system and pH adjustment device |
| US10202291B2 (en) | 2013-02-25 | 2019-02-12 | Mitsubishi Heavy Industries Engineering, Ltd. | Reverse osmosis membrane apparatus and method of operating same |
| WO2021240967A1 (en) * | 2020-05-28 | 2021-12-02 | 栗田工業株式会社 | Reverse osmosis membrane processing method |
-
1997
- 1997-10-28 JP JP29556597A patent/JP3944973B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007125526A (en) * | 2005-11-07 | 2007-05-24 | Kurita Water Ind Ltd | Operation method of reverse osmosis membrane separator |
| WO2011068027A1 (en) * | 2009-12-02 | 2011-06-09 | 三菱重工業株式会社 | Method for cleaning filtration membrane |
| JP2011115712A (en) * | 2009-12-02 | 2011-06-16 | Mitsubishi Heavy Ind Ltd | Washing method of filter membrane |
| JP2013514067A (en) * | 2009-12-17 | 2013-04-25 | ヴィンターズハル、ホールディング、ゲゼルシャフト、ミット、ベシュレンクテル、ハフツング | Method for preparing homopolysaccharide |
| US10202291B2 (en) | 2013-02-25 | 2019-02-12 | Mitsubishi Heavy Industries Engineering, Ltd. | Reverse osmosis membrane apparatus and method of operating same |
| JP2016221480A (en) * | 2015-06-02 | 2016-12-28 | 株式会社東芝 | Water treatment system, pH adjustment system and pH adjustment device |
| WO2021240967A1 (en) * | 2020-05-28 | 2021-12-02 | 栗田工業株式会社 | Reverse osmosis membrane processing method |
| JP2021186727A (en) * | 2020-05-28 | 2021-12-13 | 栗田工業株式会社 | Reverse osmosis membrane treatment method |
| CN115551622A (en) * | 2020-05-28 | 2022-12-30 | 栗田工业株式会社 | Reverse osmosis membrane treatment method |
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| Publication number | Publication date |
|---|---|
| JP3944973B2 (en) | 2007-07-18 |
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