JP3630152B2 - Operation method of membrane separator - Google Patents

Operation method of membrane separator Download PDF

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Publication number
JP3630152B2
JP3630152B2 JP2002208079A JP2002208079A JP3630152B2 JP 3630152 B2 JP3630152 B2 JP 3630152B2 JP 2002208079 A JP2002208079 A JP 2002208079A JP 2002208079 A JP2002208079 A JP 2002208079A JP 3630152 B2 JP3630152 B2 JP 3630152B2
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Japan
Prior art keywords
membrane
membrane module
tank
membrane separation
water
Prior art date
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Expired - Lifetime
Application number
JP2002208079A
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Japanese (ja)
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JP2003038939A (en
Inventor
繁樹 沢田
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.)
Kurita Water Industries Ltd
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Kurita Water Industries Ltd
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
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Priority to JP2002208079A priority Critical patent/JP3630152B2/en
Publication of JP2003038939A publication Critical patent/JP2003038939A/en
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Description

【0001】
【発明の属する技術分野】
本発明は膜分離装置の運転方法に係り、特に、槽内に膜モジュールが懸垂された膜分離装置において、膜分離処理により汚染した分離膜の膜面付着物を効率的に除去する膜分離装置の運転方法に関する。
【0002】
【従来の技術】
産業廃水や用水、或いは上下水について、限外濾過膜等の分離膜により固液分離を行なって、微粒子やコロイドを含有しない処理水を生産する膜分離処理が広く利用されている。
【0003】
本発明者らは、このような処理に用いられる膜分離装置として、槽内に平膜モジュールを懸垂し、この平膜モジュールの処理水取り出し側を吸引する手段を設けた膜分離装置を発明し、先に特許出願した(特開平1−293103号公報)。
【0004】
特開平1−293103号公報記載の膜分離装置によれば、吸引手段により、処理水を吸引濾過することにより効率的に膜分離を進行させることができ、また、間欠的に吸引を行なって膜面に付与する負圧を増減することにより、膜面付着物の蓄積を防止して高い透過流束を維持することができる。
【0005】
【発明が解決しようとする課題】
しかしながら、上記特開平1−293103号公報記載の膜分離装置であっても、菌体濃度の高い原水の処理を継続すると、膜面に粘質状の付着物が固着し、次第に透過流束が低下するという問題があった。
【0006】
本発明は上記従来の問題点を解決し、槽内に膜モジュールが懸垂された膜分離装置において、膜面付着物を容易かつ効率的に除去することができる膜分離装置の運転方法を提供することを目的とする。
【0007】
【課題を解決するための手段】
本発明の膜分離装置の運転方法は、槽内に膜モジュールが懸垂されると共に、該槽内の膜モジュールの下方に散気手段を設けると共に、該膜モジュールの透過水を吸引するための吸引ポンプを設けた膜分離装置において、該吸引ポンプによる間欠的な吸引濾過を継続した後に、該膜モジュールの透過流束が規定値以下になった場合、或いは、予め設定した一定の運転時間経過後に、散気により波を発生させながら該槽内の水の排出を行なうことを特徴とする。
【0008】
本発明の膜分離装置の運転方法において、間欠的な吸引濾過を継続した後に、膜モジュールの透過流束が規定値以下になった場合、或いは、予め設定した一定の運転時間経過後 に、膜分離処理を停止して、散気手段より散気して波を発生させると共に、排出手段より槽内の保有水を排出する。槽内の保有水面は、排出手段による排水に従って、徐々に、膜モジュールの上方から下方へ降下してゆくが、この保有水面は、散気手段により散気された気泡の崩壊で極めて大きく強い波の脈動面となっている。従って、この脈動面が膜モジュールの表面を上方から下方へ移動することにより、膜面の粘質状付着物質は効果的に剥離除去され、剥離した付着物は排水手段により排水と共に槽外へ円滑に排出される。
【0009】
【発明の実施の形態】
以下図面を参照して本発明の実施例について詳細に説明する。
【0010】
図1は本発明の一実施例を示す膜分離装置の系統図であって、図1(a)は膜処理時を示し、図1(b)は付着物の除去処理時を示す。
【0011】
図示の膜分離装置は、原水が貯留された槽1内に膜モジュール2が懸垂されており、この膜モジュール2の透過水は吸引ポンプPを備える配管3より排出される。また、槽1内の膜モジュール2下方には、散気管4が設けられている。この散気管4は、膜モジュール2の膜面のほぼ全面に散気された気泡が接触するように、槽1内の膜モジュール2の下方位置に延出して設けられている。5は槽1内の保有水の排出配管であり、バルブVを備える。
【0012】
本実施例の膜分離装置により、原水の膜分離処理を行なう場合には、図1(a)に示す如く、吸引ポンプPで透過水を吸引して、効率的な膜濾過を行なう。また、ポンプPによる吸引を間欠的に行なって、適宜膜面汚染を防止する。
【0013】
このような吸引濾過の継続により、膜モジュール2の膜面に粘質状物質が付着して、透過流束が規定値以下になった場合、或いは、予め設定した一定の運転時間経過後において定期的に、次のような操作により膜面付着物の除去を行なう。
【0014】
即ち、ポンプPを停止し、バルブVを開として槽1内の保有水を配管5より排出すると共に、散気管4による散気を開始して槽1内に粗大気泡を混入させる。
【0015】
これにより、槽1内の保有水面Wには、図1(b)に示す如く、散気された気泡の崩壊で極めて大きく強い波が発生し、この波立った保有水面Wの波が膜モジュール2の膜面に衝突することにより、膜面の付着物は効率的に剥離除去される。そして、排水に伴い、この保有水面Wが膜モジュール2の上方から下方へ降下することにより、膜モジュール2の膜面は全面的にその付着物が除去される。
【0016】
このようにして膜面から剥離除去された付着物は、排水と共に、配管5より槽1外へ排出される。
【0017】
排水終了後は、再度原水を槽1内に導入して膜分離処理を再開する。
【0018】
なお、図示の膜分離装置は本発明に係る膜分離装置の一実施例であって、本発明はその要旨を超えない限り、何ら図示のものに限定されるものではない。例えば、排出配管の排水操作はバルブによるものの他、別途ポンプを設けて行なうこともできる。
【0019】
本発明において、膜モジュール1は平膜状のものであっても、中空糸膜をすだれ状又は束状に結束して設置したものであっても良いが、本発明は特に、強力な逆圧洗浄が適さない平膜状膜モジュールを用いる場合に有効である。
【0020】
【発明の効果】
以上詳述した通り、本発明の膜分離装置の運転方法によれば、槽内を散気することにより波を発生させながら槽内の保有水を排出することにより、膜面に付着した粘質状の付着物を容易かつ効率的に剥離除去して、槽外へ排出することができる。このため、本発明によれば、膜モジュールの透過流束を高く維持することが可能とされ、膜分離処理効率は大幅に向上する。
【図面の簡単な説明】
【図1】本発明の一実施例を示す膜分離装置の系統図であって、図1(a)は膜処理時を示し、図1(b)は付着物の除去処理時を示す。
【符号の説明】
1 槽
2 膜モジュール
4 散気管
5 排出配管
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for operating a membrane separation device, and more particularly, in a membrane separation device in which a membrane module is suspended in a tank, a membrane separation device that efficiently removes membrane surface deposits contaminated by membrane separation treatment. Relates to the driving method.
[0002]
[Prior art]
Membrane separation processing is widely used in which industrial wastewater, irrigation water, or water and sewage are subjected to solid-liquid separation using a separation membrane such as an ultrafiltration membrane to produce treated water that does not contain fine particles or colloids.
[0003]
The present inventors have invented a membrane separation apparatus provided with means for suspending a flat membrane module in a tank and suctioning the treated water take-out side of the flat membrane module as a membrane separation apparatus used for such treatment. Have previously filed a patent application (Japanese Patent Laid-Open No. 1-293103).
[0004]
According to the membrane separation apparatus described in JP-A-1-293103, the membrane separation can be efficiently advanced by suction filtration of the treated water by the suction means, and the membrane can be intermittently aspirated to perform the membrane separation. By increasing or decreasing the negative pressure applied to the surface, accumulation of film surface deposits can be prevented and a high permeation flux can be maintained.
[0005]
[Problems to be solved by the invention]
However, even in the membrane separation apparatus described in JP-A-1-293103, sticking of sticky deposits to the membrane surface and the permeation flux gradually increase when the raw water treatment with high bacterial cell concentration is continued. There was a problem of lowering.
[0006]
The present invention solves the above-mentioned conventional problems, and provides a method for operating a membrane separation device that can easily and efficiently remove membrane surface deposits in a membrane separation device in which a membrane module is suspended in a tank. For the purpose.
[0007]
[Means for Solving the Problems]
The operation method of the membrane separation apparatus of the present invention is that the membrane module is suspended in the tank, and a diffuser is provided below the membrane module in the tank, and suction for sucking the permeated water of the membrane module In a membrane separation apparatus provided with a pump , when the permeation flux of the membrane module falls below a specified value after continuing intermittent suction filtration by the suction pump, or after a predetermined operating time has elapsed , and performs the discharge of water in the cistern while generating a wave by air diffusion.
[0008]
In the operation method of the membrane separation apparatus of the present invention, after the intermittent suction filtration is continued, when the permeation flux of the membrane module becomes a specified value or less, or after the elapse of a predetermined operation time set in advance , stop the separation process, and the air diffuser from the air diffuser means to generate waves Rutotomoni to discharge the held water in the tank from the discharge means. The retained water surface in the tank gradually descends from above the membrane module according to the drainage by the discharge means, but this retained water surface is extremely large and strong due to the collapse of bubbles diffused by the aeration means. It has become a pulsating surface. Therefore, this pulsating surface moves from the upper side to the lower side of the membrane module, so that the sticky adherent on the membrane surface is effectively peeled and removed. To be discharged.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings.
[0010]
FIG. 1 is a system diagram of a membrane separation apparatus according to an embodiment of the present invention. FIG. 1 (a) shows a membrane treatment, and FIG. 1 (b) shows a deposit removal treatment.
[0011]
In the illustrated membrane separation apparatus, a membrane module 2 is suspended in a tank 1 in which raw water is stored, and the permeated water of the membrane module 2 is discharged from a pipe 3 provided with a suction pump P. Further, an aeration tube 4 is provided below the membrane module 2 in the tank 1. The air diffuser 4 is provided to extend to a position below the membrane module 2 in the tank 1 so that bubbles diffused over almost the entire membrane surface of the membrane module 2 are in contact with each other. Reference numeral 5 denotes a drain pipe for retained water in the tank 1, and includes a valve V.
[0012]
When membrane separation processing of raw water is performed by the membrane separation apparatus of this embodiment, as shown in FIG. 1 (a), permeated water is sucked by the suction pump P and efficient membrane filtration is performed. In addition, the suction by the pump P is intermittently performed to appropriately prevent film surface contamination.
[0013]
Due to the continuation of such suction filtration, sticky substances adhere to the membrane surface of the membrane module 2 and the permeation flux falls below the specified value, or after a predetermined operating time has elapsed Specifically, the film surface deposits are removed by the following operation.
[0014]
That is, the pump P is stopped, the valve V is opened, the water held in the tank 1 is discharged from the pipe 5, and the air diffused by the air diffuser 4 is started to mix coarse bubbles in the tank 1.
[0015]
As a result, as shown in FIG. 1 (b), an extremely large and strong wave is generated on the retained water surface W in the tank 1 due to the collapse of the diffused bubbles. By colliding with the second film surface, deposits on the film surface are efficiently peeled and removed. Then, as the retained water surface W descends from above the membrane module 2 along with the drainage, the deposit on the membrane surface of the membrane module 2 is entirely removed.
[0016]
The deposits peeled and removed from the film surface in this way are discharged out of the tank 1 from the pipe 5 together with the drainage.
[0017]
After the drainage is completed, the raw water is again introduced into the tank 1 and the membrane separation process is resumed.
[0018]
The illustrated membrane separation apparatus is an embodiment of the membrane separation apparatus according to the present invention, and the present invention is not limited to the illustrated one as long as the gist thereof is not exceeded. For example, the drainage operation of the discharge pipe can be performed by providing a separate pump in addition to using a valve.
[0019]
In the present invention, the membrane module 1 may be in the form of a flat membrane, or may be installed by binding hollow fiber membranes in an interdigital or bundle shape. This is effective when using a flat membrane module that is not suitable for cleaning.
[0020]
【The invention's effect】
As described above in detail, according to the method of operating a membrane separation apparatus of the present invention, by discharging the held water in the tank while generating a wave by aeration of the tank, the viscosity stick to a film plane The quality deposits can be easily and efficiently peeled off and discharged out of the tank. For this reason, according to the present invention, the permeation flux of the membrane module can be maintained high, and the membrane separation efficiency is greatly improved.
[Brief description of the drawings]
FIG. 1 is a system diagram of a membrane separation apparatus according to an embodiment of the present invention, in which FIG. 1 (a) shows a membrane treatment time, and FIG. 1 (b) shows a deposit removal treatment time.
[Explanation of symbols]
1 Tank 2 Membrane module 4 Aeration pipe 5 Discharge pipe

Claims (1)

槽内に膜モジュールが懸垂されると共に、該槽内の膜モジュールの下方に散気手段を設けると共に、該膜モジュールの透過水を吸引するための吸引ポンプを設けた膜分離装置において、該吸引ポンプによる間欠的な吸引濾過を継続した後に、該膜モジュールの透過流束が規定値以下になった場合、或いは、予め設定した一定の運転時間経過後に、
散気により波を発生させながら該槽内の水の排出を行なうことを特徴とする膜分離装置の運転方法。
With the membrane module is suspended in the bath, provided with air diffusion means below the membrane modules in the cistern, the membrane separation device provided with a suction pump for sucking permeate the membrane module, the suction After the intermittent suction filtration by the pump is continued, when the permeation flux of the membrane module becomes a specified value or less, or after a predetermined operation time elapses,
A method for operating a membrane separation apparatus, wherein water is discharged from the tank while generating waves by aeration.
JP2002208079A 2002-07-17 2002-07-17 Operation method of membrane separator Expired - Lifetime JP3630152B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002208079A JP3630152B2 (en) 2002-07-17 2002-07-17 Operation method of membrane separator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002208079A JP3630152B2 (en) 2002-07-17 2002-07-17 Operation method of membrane separator

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP19245593A Division JP3351037B2 (en) 1993-08-03 1993-08-03 Cleaning method for membrane separation equipment

Publications (2)

Publication Number Publication Date
JP2003038939A JP2003038939A (en) 2003-02-12
JP3630152B2 true JP3630152B2 (en) 2005-03-16

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4867180B2 (en) * 2005-03-16 2012-02-01 栗田工業株式会社 Immersion membrane separator and chemical cleaning method therefor

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