JPH047023A - Cleaning method for membrane in membrane separating device - Google Patents

Cleaning method for membrane in membrane separating device

Info

Publication number
JPH047023A
JPH047023A JP10799190A JP10799190A JPH047023A JP H047023 A JPH047023 A JP H047023A JP 10799190 A JP10799190 A JP 10799190A JP 10799190 A JP10799190 A JP 10799190A JP H047023 A JPH047023 A JP H047023A
Authority
JP
Japan
Prior art keywords
membrane
suction pump
suction
pump
negative pressure
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
Application number
JP10799190A
Other languages
Japanese (ja)
Other versions
JPH088979B2 (en
Inventor
Seiji Izumi
清司 和泉
Masashi Moro
正史 師
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.)
Kubota Corp
Original Assignee
Kubota Corp
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
Application filed by Kubota Corp filed Critical Kubota Corp
Priority to JP10799190A priority Critical patent/JPH088979B2/en
Publication of JPH047023A publication Critical patent/JPH047023A/en
Publication of JPH088979B2 publication Critical patent/JPH088979B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

PURPOSE:To eliminate a negative pressure in a short time and enhance the cleaning effect of the surface of a membrane by a method wherein, when a suction pump is stopped, an intermediate point of a suction pipe connected between the suction pump and membrane separating device is made open to the atmospheric pressure and the permeating liq. remaining in the suction pipe is made to flow reversely in the membrane separating device. CONSTITUTION:A membrane separating device 4 placed under the water to be treated in a treating tank 1 is subjected to a negative pressure applied by a suction pump 8 to separate solids from the water in the tank 1. The suction pump 8 is intermittently stopped while the surface of a filter membrane 16 in the device 4 is being cleaned with a turbulent flow. During this pump stopping period, an intermediate point of a suction pipe 7 connected between the pump 8 and the device 4 is made open to the atmospheric pressure and a suitable amt. of the permeating liq. 10 remaining in the suction pump 7 is made to flow reversely in the device 4 to thereby separate the filter membrane 16 and a filter plate 15 from each other. As a result, the negative pressure is eliminated in a short time after stopping the suction pump and the surface of the membrane can be cleaned with the filter membrane kept away from the filter plate.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は汚水処理施設において用いられる膜分離装置の
膜洗浄方法に関する。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a membrane cleaning method for a membrane separation device used in sewage treatment facilities.

従来の技術 従来、下水などの汚水処理施設として例えば、曝気槽に
膜分離装置を浸漬配置したものがある。
2. Description of the Related Art Conventionally, there are facilities for treating sewage and other sewage in which a membrane separation device is immersed in an aeration tank.

これは曝気槽内の汚泥を膜分離装置の濾過膜を介して吸
引ポンプで吸引することにより汚泥を固液分離し、濾過
膜を透過した透過液を処理水として取り出すものであっ
た。また、膜分離装置の下方から空気を曝気し、空気の
エアリフト作用により生じる上昇攪拌流によって濾過膜
の膜面に付着したケーキ層を剥離させて濾過膜の洗浄を
行っていた。さらに、膜面に吸引ポンプの吸引力を作用
させた状態においては濾過膜の膜面に付着したケーキ層
を曝気によって十分に除去することができないので、間
欠的に吸引ポンプの駆動を停止した状態において膜面の
洗浄を行ってケーキ層の蓄積が過度にならないようにし
ていた。
This system separates the sludge from solid to liquid by sucking the sludge in the aeration tank through the filtration membrane of a membrane separation device using a suction pump, and then extracts the permeate that has passed through the filtration membrane as treated water. In addition, air is aerated from below the membrane separator, and the cake layer adhering to the membrane surface of the filtration membrane is peeled off by an upward stirring flow generated by the air lift effect, thereby cleaning the filtration membrane. Furthermore, when the suction force of the suction pump is applied to the membrane surface, the cake layer adhering to the membrane surface of the filtration membrane cannot be sufficiently removed by aeration, so the suction pump is intermittently stopped. The membrane surface was cleaned to prevent excessive buildup of the cake layer.

発明が解決しようとする課題 しかし、上記した従来の構成において、吸引ポンプの停
止時間が長いほど洗浄効果は大きいが、吸引ポンプの稼
働時間が短くなるために透過液量が却って減少する問題
があった。また、吸引ポンブを停止させたたけでは濾過
膜に作用する負圧はすぐに解消されず、気密性の高いポ
ンプにおいは5〜IO分かかって負圧が解消されるので
、吸引ポンプの停止時間を有効に利用できない問題があ
った。さらに、洗浄効果は、負圧が解消されて濾過膜が
濾板から離れ、濾過膜自身が上昇攪拌流によって振動す
る状態において高くなり、負圧によって濾過膜が濾板に
張り付いた状態においては、ケーキ層の成長を抑制する
効果はあっても付着したケーキ層を剥離させる効果は期
待できないものであった0 本発明は上記課題を解決するもので、吸引ポンプの停止
後に短時間で負圧を解消するとともに、濾過膜を濾板か
ら離間させた状態で膜面の洗浄を行うことができる膜分
離装置の膜洗浄方法を提供することを目的とする。
Problems to be Solved by the Invention However, in the conventional configuration described above, although the longer the suction pump stops, the greater the cleaning effect becomes, there is a problem in that the amount of permeated liquid decreases because the suction pump operates for a shorter time. Ta. In addition, the negative pressure acting on the filtration membrane is not immediately relieved by stopping the suction pump, and with a highly airtight pump, it takes 5 to 10 minutes to eliminate the negative pressure. There was a problem that it could not be used effectively. Furthermore, the cleaning effect is high when the negative pressure is eliminated and the filtration membrane separates from the filter plate, and the filtration membrane itself vibrates due to the upward stirring flow, and when the filtration membrane is stuck to the filter plate due to negative pressure. Although it has the effect of suppressing the growth of the cake layer, it cannot be expected to have the effect of peeling off the adhered cake layer.The present invention solves the above problem, and aims to reduce the negative pressure in a short time after stopping the suction pump. It is an object of the present invention to provide a method for cleaning a membrane of a membrane separation device, which can solve the problem and clean the membrane surface while the filtration membrane is separated from the filter plate.

課題を解決するための手段 上記課題を解決するために本発明は、処理槽に浸漬配置
され、吸引ポンプによって加えられる負圧をうけて槽内
の被処理水を固液分離する膜分離装置において、膜分離
装置の濾過膜の膜面を撹拌流によって洗浄しながら吸引
ポンプを間欠的に停止し、吸引ポンプの停止時に、吸引
ポンプと膜分離装置を連通ずる吸引管の途中を大気圧下
に開放するとともに、吸引管内に滞留する適当量の透過
液を膜分離装置内に逆流させ、逆流した透過液によって
濾過膜と濾板の間を離間させる構成としたものである。
Means for Solving the Problems In order to solve the above problems, the present invention provides a membrane separation device that is immersed in a treatment tank and separates the water to be treated in the tank into solid and liquid by receiving negative pressure applied by a suction pump. , the suction pump is stopped intermittently while the membrane surface of the filtration membrane of the membrane separation device is washed with an agitation flow, and when the suction pump is stopped, the middle of the suction pipe connecting the suction pump and the membrane separation device is brought under atmospheric pressure. When the suction tube is opened, an appropriate amount of permeate remaining in the suction tube is caused to flow back into the membrane separation device, and the backflowing permeate separates the filtration membrane and the filter plate.

作用 上記した構成により、吸引ポンプか作動する状態におい
て、膜分離装置の膜面は撹拌流によって洗浄され、膜面
に対するケーキ層の付着が抑制される。そして、吸引ポ
ンプの停止時に吸引管の途中を大気圧下に開放すること
により、膜分離装置の濾過膜に作用する負圧を速やかに
解消して吸弓ポンプの停止後直ちに攪拌流による膜面の
洗浄効果を高めることができる。さらに、透過液を逆流
させて濾過膜と濾板を離間させることにより、濾過膜自
身が撹拌流の作用をうけて振動し、膜面に付着したケー
キ層の剥離が促進され、短時間に効率良く濾過膜の洗浄
を行える。
Effect: With the above-described configuration, when the suction pump is in operation, the membrane surface of the membrane separator is washed by the stirring flow, and adhesion of the cake layer to the membrane surface is suppressed. By opening the middle of the suction pipe to atmospheric pressure when the suction pump is stopped, the negative pressure acting on the filtration membrane of the membrane separator is quickly eliminated, and the membrane surface is created by stirring flow immediately after the suction pump is stopped. The cleaning effect can be enhanced. Furthermore, by back-flowing the permeate and separating the filtration membrane and the filter plate, the filtration membrane itself vibrates under the action of the stirring flow, promoting the peeling of the cake layer attached to the membrane surface, resulting in a quick and efficient process. The filter membrane can be cleaned well.

実施例 以下本発明の一実施例を図面に基づいて説明する。第1
図において、処理槽をなす曝気槽1には下水汚泥などの
被処理液2を供給するための汚泥供給管3が開口してお
り、曝気槽1の内部には膜分離装置4が浸漬配置されて
いる。また、膜分離装置4の下方には散気管5が配置さ
れており、散気管5はブロアー6に連通している。そし
て、膜分離装置4は吸引管7を介して吸引ポンプ8に連
通しており、吸引ポンプ8は透過液供給管9を介して透
過液IOの貯留槽11に連通している。また、貯留槽1
1は大気開放された状態にあり、上部に透過液排出管I
2が開口するとともに、底部が開閉弁13を介して吸引
管7の途中に連通している。
EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In the figure, a sludge supply pipe 3 for supplying a liquid to be treated such as sewage sludge 2 is opened to an aeration tank 1 forming a treatment tank, and a membrane separation device 4 is immersed inside the aeration tank 1. ing. Further, an aeration pipe 5 is arranged below the membrane separator 4 , and the aeration pipe 5 communicates with a blower 6 . The membrane separator 4 communicates with a suction pump 8 via a suction pipe 7, and the suction pump 8 communicates with a storage tank 11 for permeate IO via a permeate supply pipe 9. In addition, storage tank 1
1 is open to the atmosphere, and there is a permeate discharge pipe I at the top.
2 opens, and its bottom communicates with the suction pipe 7 via an on-off valve 13.

そして、第2図に示すように、膜分離装置4には複数の
膜モジュール14が配置されており、各膜モジュール1
4は濾板15と、濾板15の表面を覆って設けた濾過膜
16とで形成されている。また、濾板15に設けた透過
液流路17は吸引管7に連通している。
As shown in FIG. 2, a plurality of membrane modules 14 are arranged in the membrane separation device 4, and each membrane module 1
4 is formed by a filter plate 15 and a filter membrane 16 provided to cover the surface of the filter plate 15. Further, a permeate flow path 17 provided in the filter plate 15 communicates with the suction tube 7.

以下、上記構成における作用について説明する。The effects of the above configuration will be explained below.

開閉弁13を閉塞した状態において吸引ポンプ8を運転
して膜分離装置4に負圧を加え、汚泥供給管3から曝気
槽1に流入した被処理液2を膜分離装置4を介して吸引
し、濾過膜16で固液を分離する。
With the on-off valve 13 closed, the suction pump 8 is operated to apply negative pressure to the membrane separation device 4, and the liquid to be treated 2 that has flowed into the aeration tank 1 from the sludge supply pipe 3 is sucked through the membrane separation device 4. , solid and liquid are separated by a filter membrane 16.

そして、濾過膜16を透過した透過液IOを透過液流路
17、吸引管7および透過液供給管9を通して貯留槽I
Iに供給する。また、ブロアー6により供給される空気
を散気管5から曝気し、曝気された空気のエアリフト作
用によって生じる上昇攪拌流によって濾過膜16の膜面
を洗浄する。
Then, the permeate IO that has passed through the filtration membrane 16 is passed through the permeate flow path 17, the suction pipe 7, and the permeate supply pipe 9 to the storage tank I.
Supply to I. Further, the air supplied by the blower 6 is aerated through the aeration pipe 5, and the membrane surface of the filtration membrane 16 is washed by an upward stirring flow generated by the air lift action of the aerated air.

尚、膜面の洗浄は、水中撹拌機などにより膜面に対して
平行な流速をもつ撹拌流を生じさせて行っても良い。
Note that the membrane surface may be washed by using an underwater agitator or the like to generate an agitation flow having a flow velocity parallel to the membrane surface.

そして、吸引ポンプ8の運転を間欠的に停止し、吸引ポ
ンプ8の停止とともに開閉弁13を開放する。
Then, the operation of the suction pump 8 is stopped intermittently, and when the suction pump 8 is stopped, the on-off valve 13 is opened.

この開閉弁13の開放によって吸引管7は貯留槽IIに
連通して大気圧下に開放され、吸引管7および膜分離装
置4の内部における負圧が速やかに解消される。このた
め、負圧の解消に時間を費やすことなく、吸引ポンプ8
の停止後直ちに上昇攪拌流による膜面の洗浄効果を高め
ることができる。また、貯留槽11の透過液IOが吸引
管7を通して膜分離装置4に逆流し、第3図に示すよう
に、逆流した透過液IOが濾過膜16と濾板15の間に
流入して濾過膜I6と濾板15が離間される。このため
、濾過膜16が自ら上昇撹拌流の作用をうけて振動し、
膜面に付着したケーキ層の剥離か促進され、短時間に効
率良く濾過膜16の洗浄が行われる。
By opening the on-off valve 13, the suction pipe 7 is communicated with the storage tank II and opened to atmospheric pressure, and the negative pressure inside the suction pipe 7 and the membrane separation device 4 is quickly eliminated. Therefore, the suction pump 8
The cleaning effect of the membrane surface due to the rising agitation flow can be enhanced immediately after the cessation of the flow. Also, the permeate IO in the storage tank 11 flows back into the membrane separator 4 through the suction pipe 7, and as shown in FIG. Membrane I6 and filter plate 15 are spaced apart. For this reason, the filtration membrane 16 vibrates by itself under the action of the upward stirring flow,
The peeling of the cake layer adhering to the membrane surface is promoted, and the filtration membrane 16 is efficiently cleaned in a short time.

発明の効果 以上述べたように本発明によれば、吸引ポンプの停止時
に吸引管の途中を大気圧下に開放することにより、膜分
離装置の濾過膜に作用する負圧を速やかに解消して吸引
ポンプの停止後直ちに上昇撹拌流による膜面の洗浄効果
を高めることができ、透過液を逆流させて濾過膜と濾板
を離間させることにより、濾過膜自身を上昇撹拌流の作
用をうけて振動させ、膜面に付着したケーキ層の剥離を
促進して短時間に効率良く濾過膜の洗浄を行うことかで
きる。
Effects of the Invention As described above, according to the present invention, by opening the middle of the suction pipe to atmospheric pressure when the suction pump is stopped, the negative pressure acting on the filtration membrane of the membrane separation device can be quickly eliminated. Immediately after stopping the suction pump, the cleaning effect of the membrane surface due to the upward agitation flow can be enhanced, and by causing the permeate to flow backward and separating the filtration membrane and the filter plate, the filtration membrane itself is affected by the action of the upward agitation flow. The filter membrane can be cleaned efficiently in a short period of time by vibrating and promoting the peeling of the cake layer adhering to the membrane surface.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例を示す全体構成図、第2図は
同実施例における膜モジュール14の断面図、第3図は
同実施例における透過液逆流時の膜モジュールI4の作
用状態図である。 1・・・曝気槽、4・・・膜分離装置、7・・・吸引管
、8・・・吸引ポンプ、IO・・・透過液、13・・・
開閉弁。
Fig. 1 is an overall configuration diagram showing one embodiment of the present invention, Fig. 2 is a sectional view of the membrane module 14 in the same embodiment, and Fig. 3 is the operating state of the membrane module I4 during backflow of permeate in the same embodiment. It is a diagram. 1... Aeration tank, 4... Membrane separation device, 7... Suction pipe, 8... Suction pump, IO... Permeated liquid, 13...
Open/close valve.

Claims (1)

【特許請求の範囲】[Claims] 1、処理槽に浸漬配置され、吸引ポンプによって加えら
れる負圧をうけて槽内の被処理水を固液分離する膜分離
装置において、膜分離装置の濾過膜の膜面を攪拌流によ
って洗浄しながら吸引ポンプを間欠的に停止し、吸引ポ
ンプの停止時に、吸引ポンプと膜分離装置を連通する吸
引管の途中を大気圧下に開放するとともに、吸引管内に
滞留する適当量の透過液を膜分離装置内に逆流させ、逆
流した透過液によって濾過膜と濾板の間を離間させるこ
とを特徴とする膜分離装置の膜洗浄方法。
1. In a membrane separation device that is immersed in a treatment tank and separates the water to be treated in the tank from solid to liquid under negative pressure applied by a suction pump, the membrane surface of the filtration membrane of the membrane separation device is washed by an agitating flow. At the same time, the suction pump is stopped intermittently, and when the suction pump is stopped, the middle of the suction pipe that connects the suction pump and the membrane separation device is opened to atmospheric pressure, and an appropriate amount of permeate remaining in the suction pipe is removed from the membrane. 1. A method for cleaning a membrane in a membrane separator, which comprises causing the permeate to flow back into the separator and separating the filtration membrane and the filter plate by the backflow of the permeate.
JP10799190A 1990-04-24 1990-04-24 Membrane cleaning method for membrane separation device Expired - Fee Related JPH088979B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10799190A JPH088979B2 (en) 1990-04-24 1990-04-24 Membrane cleaning method for membrane separation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10799190A JPH088979B2 (en) 1990-04-24 1990-04-24 Membrane cleaning method for membrane separation device

Publications (2)

Publication Number Publication Date
JPH047023A true JPH047023A (en) 1992-01-10
JPH088979B2 JPH088979B2 (en) 1996-01-31

Family

ID=14473213

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10799190A Expired - Fee Related JPH088979B2 (en) 1990-04-24 1990-04-24 Membrane cleaning method for membrane separation device

Country Status (1)

Country Link
JP (1) JPH088979B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5620605A (en) * 1992-05-22 1997-04-15 The Dow Chemical Company Cassette membrane system and method of use for low pressure separations
JP2007198619A (en) * 2006-01-24 2007-08-09 Matsushita Electric Ind Co Ltd Gas cooker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5620605A (en) * 1992-05-22 1997-04-15 The Dow Chemical Company Cassette membrane system and method of use for low pressure separations
JP2007198619A (en) * 2006-01-24 2007-08-09 Matsushita Electric Ind Co Ltd Gas cooker

Also Published As

Publication number Publication date
JPH088979B2 (en) 1996-01-31

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