JP4382275B2 - Membrane module cleaning method - Google Patents

Membrane module cleaning method Download PDF

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Publication number
JP4382275B2
JP4382275B2 JP2000381763A JP2000381763A JP4382275B2 JP 4382275 B2 JP4382275 B2 JP 4382275B2 JP 2000381763 A JP2000381763 A JP 2000381763A JP 2000381763 A JP2000381763 A JP 2000381763A JP 4382275 B2 JP4382275 B2 JP 4382275B2
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membrane
chemical solution
membrane module
treated water
water
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JP2002177746A (en
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辰彦 鈴木
裕宣 寺本
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Maezawa Industries Inc
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Maezawa Industries Inc
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【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、浸漬型中空糸膜モジュールの薬液洗浄を効率よく行う方法に関する。
【０００２】
【従来の技術】
各種水処理における固液分離手段として近年急速に実用化が進んでいる浸漬型中空糸膜モジュールを使用した膜ろ過装置は、タンクあるいは既存の池等に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。しかし、固液分離の進行に伴い、膜に有機物や金属、生物スライム等が付着し、これらが、膜表面だけでなく、膜孔内あるいは膜繊維の中にまで入り込み、これを放置しておくと目詰まりが発生してろ過機能が失われてしまう。
【０００３】
したがって、従来から、膜の目詰まりを防止するため、所定期間毎に薬液によって膜を洗浄することが行われており、膜の種類や付着物の性状に応じてアルカリ、酸、酸化剤等を使用して付着物を除去するようにしている。洗浄方法としては、膜モジュールをろ過槽から別に設けた薬液洗浄槽に移して薬液洗浄を行う方法や、膜の透過水側から薬液を注入して行う方法が行われている。
【０００４】
【発明が解決しようとする課題】
しかし、従来の洗浄方法では、いずれの方法においても薬液を大量に必要とし、また、水回収率も低いという問題があった。例えば、ろ過槽内に膜モジュールを浸漬したままの状態で膜の透過水側に薬液を注入するインライン洗浄を行う場合は、まず、ろ過工程処理終了後の薬液洗浄開始時に、膜内や配管内に処理水が充満した状態で薬液を注入するので、薬液が膜面に到達するまでに配管内及び膜モジュール内に残っている処理水がろ過槽内に戻されることになる。
【０００５】
したがって、この分の処理水が無駄になって処理効率が低下する。さらに、薬液洗浄後にろ過工程を開始するときには、配管内及び膜モジュール内に残留した薬液が十分に希釈されるまでの間、膜透過水を前処理工程に戻す捨水工程等を長時間行う必要があり、この間は、処理水が発生しないため、ここでも処理効率が低下することになる。
【０００６】
そこで本発明は、少量の薬液で効果的な膜洗浄を行うことができるとともに、処理効率を向上させて水回収率を高めることができ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。
【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、浸漬型中空糸膜モジュールを薬液により洗浄する方法であって、ろ過工程処理終了時に、膜モジュールの一端から膜内に圧縮空気を導入して膜内の処理水を膜モジュールの他端から処理水槽に回収する処理水回収工程と、該処理水回収工程終了後に膜モジュールの一端から膜内に薬液を注入する薬液注入工程と、該薬液注入工程終了後に膜モジュールの一端から膜内に圧縮空気を導入して前記薬液を膜外部側に押出す薬液押出工程と、該薬液押出工程終了後に膜内に処理水を導入して膜内を水で満たす処理水導入工程とを含むことを特徴とし、特に、前記処理水回収工程終了後に、圧縮空気の導入を継続して圧縮空気を膜外部側に噴出させる空気逆洗工程を行い、次いで前記薬液注入工程を行うことを特徴としている。
【０００８】
さらに、前記薬液押出工程と処理水導入工程との間に、膜内に処理水を導入して膜内を水で満たした後、膜内に圧縮空気を導入して処理水を膜外部側に押出す濯ぎ工程を行うことにより、膜内の薬液を確実に膜外部に排出することができる。
【００１０】
【発明の実施の形態】
図１は、本発明の膜モジュールの洗浄方法を実施することができる膜ろ過装置の一形態例を示す系統図である。この膜ろ過装置は、ろ過槽１１と、該ろ過槽１１内に設置された中空糸膜モジュール１２と、該中空糸膜モジュール１２の両端にそれぞれ接続した一対の処理水吸引経路１３ａ，１３ｂ及び両経路１３ａ，１３ｂにそれぞれ設けられた吸引弁１４ａ，１４ｂと、該吸引弁１４ａ，１４ｂの下流側で合流した処理水吸引経路１３を介して処理水（膜透過水）を吸引するための吸引ポンプ１５と、吸引ポンプ１５で吸引した処理水を貯留する処理水槽１６と、一方の処理水吸引経路１３ｂの前記吸引弁１４ｂよりも膜側に接続した洗浄経路１７と、該洗浄経路１７に空気導入弁１８を介して接続した空気圧縮機１９と、洗浄経路１７に薬液注入弁２０を介して接続した薬液注入ポンプ２１及び薬液貯槽２２と、処理水導入弁２３を介して接続した逆洗ポンプ２４とを備えている。
【００１１】
まず、ろ過工程では、原水流入経路２５からろ過槽１１内に原水を流入させ、前記空気導入弁１８、薬液注入弁２０及び処理水導入弁２３をそれぞれ閉、前記吸引弁１４ａ，１４ｂを開とした状態で吸引ポンプ１５が作動することにより、中空糸膜モジュール１２内の膜透過水を吸引するろ過処理が行われ、膜透過水（処理水）が処理水吸引経路１３ａ，１３ｂ，１３を通って処理水槽１６に取出され、処理水流出経路２６から流出する。
【００１２】
膜モジュール１２の薬液洗浄は、次のような手順で行う。まず、吸引ポンプ１５を停止させてろ過工程を終了した後、洗浄経路１７が接続した処理水吸引経路１３ｂの吸引弁１４ｂを閉じ、他方の吸引弁１４ａを開いたままの状態とし、空気導入弁１８を開いて空気圧縮機１９を作動させ、処理水回収工程を行う。
【００１３】
これにより、洗浄経路１７から一方の処理水吸引経路１３ｂを通して膜モジュール１２の一端に圧縮空気が導入され、この圧縮空気によって処理水吸引経路１３ａ等の配管内や膜モジュール内に充満していた処理水が吸引弁１４ａ、処理水吸引経路１３ａ、処理水吸引経路１３及び吸引ポンプ１５を通って処理水槽１６に回収される。
【００１４】
このとき、吸引ポンプ１５は、その構造に応じて、適当な速度で作動させておいてもよく、停止させておいてもよい。また、吸引ポンプ１５をバイパスさせて処理水を処理水槽１６に回収するようにしてもよい。なお、処理水の全量を回収する必要は無い。
【００１５】
処理水を十分に回収したら、吸引弁１４ａを閉じて処理水回収工程を終了する。その後、空気圧縮機１９の運転を所定時間継続し、膜モジュール１２内に導入した圧縮空気を膜外部側に噴出させる空気逆洗工程を行うことにより、膜外面に付着した固形物を剥離させる物理的な洗浄を行うことができ、洗浄効果をより高めることができる。
【００１６】
処理水回収工程終了後、あるいは、必要に応じて行われる空気逆洗工程終了後、空気導入弁１８を閉じて空気圧縮機１９を停止させるとともに、薬液注入弁２０を開いて薬液注入ポンプ２１を作動させ、薬液貯槽２２内の薬液を膜モジュール１２内に所定量注入する薬液注入工程を行う。また、薬液貯槽２２内に使用濃度に比べて高濃度の薬液を貯留しておき、薬液の注入と同時に処理水導入弁２３を開いて逆洗ポンプ２４を作動させ、処理水を導入して薬液を所定濃度に希釈した状態で膜モジュール１２内に注入することもできる。このように高濃度の薬液を貯留することにより、薬液貯槽２２の大幅な小型化を図ることができる。
【００１７】
この薬液注入工程において、前工程終了時に膜モジュール１２内等に存在していた空気は、注入された薬液によって膜外部側に押出される。また、一部の薬液を注入圧力によって膜外部側に押出すことにより、膜内部側だけでなく膜外部側の薬液洗浄も同時に行うことができる。
【００１８】
所定量の薬液を注入したら、薬液注入ポンプ２１を停止させて薬液注入弁２０を閉じ、薬液注入工程を終了した後、空気導入弁１８を開いて空気圧縮機１９を作動させ、圧縮空気により膜モジュール１２内の薬液を膜外部側に押出す薬液押出工程を行う。この薬液押出工程を行うことにより、膜に付着した有機物や金属、生物スライム等を除去する薬液洗浄を行うことができる。
【００１９】
なお、前記薬液注入工程及び薬液押出工程は、必要に応じて複数回繰返して行うこともでき、異なる薬液を使用して同じ工程を繰返すこともできる。また、前記薬液押出工程終了後、必要に応じて前記同様の空気逆洗工程を行い、圧縮空気を膜外部側に噴出させることにより、薬液洗浄によって除去された付着物をより確実に膜面から排除することができる。
【００２０】
薬液押出工程あるいは必要に応じて行われる空気逆洗工程を終了した後、空気導入弁１８を閉じて空気圧縮機１９を停止させるとともに、処理水導入弁２３及び吸引弁１４ａを開いて逆洗ポンプ２４を作動させ、処理水槽１６内の処理水を膜モジュール１２内に導入し、膜モジュール１２内や処理水吸引経路１３ａ，１３ｂ，１３等の配管内を水で満たす処理水導入工程を行う。
【００２１】
このとき、吸引弁１４ａを閉じた状態で膜モジュール１２内への処理水の導入を行い、次いで、前記薬液押出工程と同様にして圧縮空気で膜モジュール１２内の水を膜外部側に押出す濯ぎ工程を必要に応じて行うことにより、膜モジュール１２内の薬液をより確実に膜モジュール１２内から排除することができる。
【００２２】
前記処理水導入工程は、膜モジュール１２内等が水で満たされ、吸引ポンプ１５による膜透過水の吸引を問題なく行えるようになるまで行われ、その後、処理水導入弁２３及び逆洗ポンプ２４を停止させて両吸引弁１４ａ，１４ｂを開き、吸引ポンプ１５を作動させることにより、ろ過工程が再開する。
【００２３】
このように、膜モジュール１２の薬液洗浄を行うにあたり、ろ過工程終了時に膜モジュール１２内等に存在する膜透過水を圧縮空気で押出して回収することにより、水回収率を高めることができる。また、膜透過水を排除してから膜モジュール１２内に薬液を注入するので、膜透過水によって希釈されることがなく、所定濃度の薬液を膜モジュール１２内に速やかに注入することができる。さらに、薬液を圧縮空気によって膜外部側に押出すようにしており、薬液を膜外部側に押出すために薬液の注入を継続する必要がないので、従来に比べて少量の薬液によって効果的に膜モジュール１２の薬液洗浄を行うことができる。
【００２４】
しかも、薬液を圧縮空気で押出すことによって膜モジュール１２内等に残留する薬液量を少なくすることができるので、処理水の導入によって薬液を十分に希釈することが可能であり、処理水導入工程を終えた後、捨水工程を行うことなくろ過工程を再開することもでき、捨水による膜透過水のロスや捨水工程の時間的ロスを解消して水回収率を大幅に高めることができる。
【００２５】
なお、ろ過工程開始時には、処理水の水質により、必要に応じて捨水工程を行うようにしてもよい。また、薬液洗浄操作中、膜モジュール１２からろ過槽１１内に放出された固形物や薬液等は、原水と共に濃縮水排出経路２７を通ってろ過槽１１から抜出され、所定の処理が行われる。
【００２６】
本形態例では、中空糸膜を鉛直方向に配置した膜モジュール１２の下端部に接続する処理水吸引経路１３ｂに洗浄経路１７を接続しているが、上部側の処理水吸引経路１３ａに接続してもよく、洗浄経路１７を分岐して弁を介して両処理水吸引経路１３ａ，１３ｂにそれぞれ接続し、弁を適当に開閉して上記各工程を行うようにしてもよい。さらに、他方の吸引弁１４ａは、処理水吸引経路１３に設けてもよい。また、中空糸膜モジュール１２の構造や膜ろ過装置の構成は任意であり、従来からの各種構造、構成を採用することができる。
【００２７】
【発明の効果】
以上説明したように、本発明によれば、圧縮空気の導入によって膜透過水の回収や薬液の膜外部側への押出しを行うようにしたので、水回収率を向上できるとともに、薬液の使用量も低減することができ、ろ過処理効率を大幅に向上させることができる。
【図面の簡単な説明】
【図１】 本発明の膜モジュールの洗浄方法を実施することができる膜ろ過装置の一形態例を示す系統図である。
【符号の説明】
１１…ろ過槽、１２…中空糸膜モジュール、１３，１３ａ，１３ｂ…処理水吸引経路、１４ａ，１４ｂ…吸引弁、１５…吸引ポンプ、１６…処理水槽、１７…洗浄経路、１８…空気導入弁、１９…空気圧縮機、２０…薬液注入弁、２１…薬液注入ポンプ、２２…薬液貯槽、２３…処理水導入弁、２４…逆洗ポンプ、２５…原水流入経路、２６…処理水流出経路、２７…濃縮水排出経路[0001]
BACKGROUND OF THE INVENTION
The present invention relates to cleaning how the membrane module, and more particularly, relates to how to perform the chemical cleaning of the submerged hollow fiber membrane module efficiently.
[0002]
[Prior art]
Membrane filtration devices using a submerged hollow fiber membrane module that has been rapidly put into practical use as a solid-liquid separation means in various water treatments can be processed by immersing the membrane module in a tank or an existing pond. Therefore, there is an advantage that solid-liquid separation can be reliably performed with a simple and compact apparatus configuration. However, with the progress of solid-liquid separation, organic matter, metal, biological slime, etc. adhere to the membrane, and these penetrate not only into the membrane surface but also into the membrane pores or into the membrane fibers, and leave them alone. Clogging occurs and the filtration function is lost.
[0003]
Therefore, conventionally, in order to prevent clogging of the film, the film is washed with a chemical solution every predetermined period, and an alkali, an acid, an oxidizing agent, etc. are added according to the type of film and the property of the deposit. Used to remove deposits. As a cleaning method, there are a method in which a membrane module is transferred from a filtration tank to a separately provided chemical solution cleaning tank and a chemical solution cleaning is performed, or a method in which a chemical solution is injected from the permeate side of the membrane.
[0004]
[Problems to be solved by the invention]
However, the conventional cleaning methods have a problem that both methods require a large amount of chemical solution and the water recovery rate is low. For example, when performing in-line cleaning in which a chemical solution is injected into the permeate side of the membrane while the membrane module is immersed in the filtration tank, first, in the membrane or piping at the start of chemical cleaning after the completion of the filtration process Since the chemical solution is injected in a state where the treated water is filled, the treated water remaining in the pipe and the membrane module is returned to the filtration tank until the chemical solution reaches the membrane surface.
[0005]
Therefore, this amount of treated water is wasted and the treatment efficiency is reduced. Furthermore, when the filtration process is started after the chemical cleaning, it is necessary to perform a draining process for returning the membrane permeated water to the pretreatment process for a long time until the chemical remaining in the pipe and the membrane module is sufficiently diluted. During this time, since no treated water is generated, the treatment efficiency is lowered here as well.
[0006]
The present invention, it is possible to perform effective membrane washing with a small amount of liquid medicine, aims at to improve the processing efficiency provide cleaning how the membrane module can increase the water recovery rate.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the membrane module cleaning method of the present invention is a method of cleaning a submerged hollow fiber membrane module with a chemical solution, and at the end of the filtration process, compressed air is introduced into the membrane from one end of the membrane module. A treated water recovery step for introducing the treated water in the membrane into the treated water tank from the other end of the membrane module; and a chemical solution injecting step for injecting a chemical solution into the membrane from one end of the membrane module after the treatment water recovery step is completed; After the chemical solution injection step is completed, a compressed air is introduced into the membrane from one end of the membrane module to extrude the chemical solution to the outside of the membrane, and treated water is introduced into the membrane after the chemical solution extrusion step is completed. A process water introduction process for filling the interior with water, and in particular, after the process water recovery process is completed, an air backwash process is performed in which the compressed air is continuously introduced and the compressed air is ejected to the outside of the membrane. Then the medicine It is characterized by performing the injection step.
[0008]
Further, after introducing the treated water into the membrane and filling the membrane with water between the chemical solution extrusion step and the treated water introducing step, the compressed air is introduced into the membrane to bring the treated water to the outside of the membrane. By performing the rinsing step of extruding, the chemical solution in the membrane can be reliably discharged to the outside of the membrane.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a system diagram showing an embodiment of a membrane filtration apparatus that can carry out the membrane module cleaning method of the present invention. This membrane filtration apparatus includes a filtration tank 11, a hollow fiber membrane module 12 installed in the filtration tank 11, a pair of treated water suction paths 13a and 13b connected to both ends of the hollow fiber membrane module 12, and both Suction valves 14a and 14b provided in the paths 13a and 13b, respectively, and a suction pump for sucking the treated water (membrane permeated water) through the treated water suction path 13 joined on the downstream side of the suction valves 14a and 14b 15, a treated water tank 16 for storing treated water sucked by the suction pump 15, a cleaning path 17 connected to the membrane side of the suction valve 14 b of one treated water suction path 13 b, and air introduction into the cleaning path 17 The air compressor 19 connected via the valve 18, the chemical solution injection pump 21 and the chemical solution storage tank 22 connected to the cleaning path 17 via the chemical solution injection valve 20, and the treated water introduction valve 23 were connected. And a wash pump 24.
[0011]
First, in the filtration step, raw water is introduced into the filtration tank 11 from the raw water inflow path 25, the air introduction valve 18, the chemical solution injection valve 20 and the treated water introduction valve 23 are closed, and the suction valves 14a and 14b are opened. In this state, the suction pump 15 operates to perform a filtration process for sucking the membrane permeated water in the hollow fiber membrane module 12, and the membrane permeated water (treated water) passes through the treated water suction paths 13 a, 13 b and 13. Then, it is taken out into the treated water tank 16 and flows out from the treated water outflow path 26.
[0012]
The chemical cleaning of the membrane module 12 is performed by the following procedure. First, after the suction pump 15 is stopped and the filtration process is finished, the suction valve 14b of the treated water suction path 13b to which the cleaning path 17 is connected is closed, and the other suction valve 14a is kept open, and the air introduction valve 18 is opened, the air compressor 19 is operated, and a treated water recovery step is performed.
[0013]
As a result, compressed air is introduced from the cleaning path 17 to one end of the membrane module 12 through the one treated water suction path 13b, and the compressed air fills the piping such as the treated water suction path 13a and the membrane module. Water is collected in the treated water tank 16 through the suction valve 14a, the treated water suction path 13a, the treated water suction path 13 and the suction pump 15.
[0014]
At this time, the suction pump 15 may be operated at an appropriate speed or may be stopped depending on the structure. Alternatively, the suction pump 15 may be bypassed to collect the treated water in the treated water tank 16. It is not necessary to collect the entire amount of treated water.
[0015]
When the treated water is sufficiently collected, the suction valve 14a is closed and the treated water collecting step is finished. Thereafter, the operation of the air compressor 19 is continued for a predetermined time, and a physical process for peeling off the solid matter adhering to the outer surface of the membrane by performing an air backwashing process in which the compressed air introduced into the membrane module 12 is ejected to the outside of the membrane. Cleaning can be performed, and the cleaning effect can be further enhanced.
[0016]
After completion of the treated water recovery process or after completion of the air backwash process performed as necessary, the air introduction valve 18 is closed to stop the air compressor 19, and the chemical liquid injection valve 20 is opened to open the chemical liquid injection pump 21. The chemical solution injection process is performed to inject a predetermined amount of chemical solution in the chemical solution storage tank 22 into the membrane module 12. In addition, a chemical solution having a concentration higher than the used concentration is stored in the chemical solution storage tank 22, and simultaneously with the injection of the chemical solution, the treatment water introduction valve 23 is opened and the backwash pump 24 is operated to introduce the treatment water and the chemical solution. Can be injected into the membrane module 12 in a state diluted to a predetermined concentration. By storing a high concentration chemical solution in this way, the chemical solution storage tank 22 can be significantly reduced in size.
[0017]
In this chemical solution injection step, the air that was present in the membrane module 12 or the like at the end of the previous step is pushed out to the outside of the membrane by the injected chemical solution. Further, by extruding a part of the chemical solution to the outside of the membrane by the injection pressure, not only the inside of the membrane but also the outside of the membrane can be cleaned simultaneously.
[0018]
When a predetermined amount of chemical liquid is injected, the chemical liquid injection pump 21 is stopped and the chemical liquid injection valve 20 is closed. After the chemical liquid injection process is completed, the air introduction valve 18 is opened and the air compressor 19 is operated, and the membrane is compressed by compressed air. A chemical solution extrusion process is performed in which the chemical solution in the module 12 is extruded to the outside of the membrane. By performing this chemical solution extrusion step, it is possible to perform chemical solution cleaning for removing organic substances, metals, biological slime and the like attached to the film.
[0019]
In addition, the said chemical | medical solution injection | pouring process and a chemical | medical solution extrusion process can also be performed in multiple times as needed, and can also repeat the same process using a different chemical | medical solution. In addition, after the chemical liquid extrusion process is completed, the air backwash process similar to the above is performed as necessary, and the compressed air is ejected to the outside of the film, thereby more reliably removing the deposits removed by the chemical liquid cleaning from the film surface. Can be eliminated.
[0020]
After finishing the chemical solution extrusion process or the air backwash process performed as necessary, the air introduction valve 18 is closed to stop the air compressor 19, and the treated water introduction valve 23 and the suction valve 14a are opened to open the backwash pump. 24, the treated water in the treated water tank 16 is introduced into the membrane module 12, and a treated water introduction process is performed to fill the membrane module 12 and the treated water suction paths 13a, 13b, 13 and the like with water.
[0021]
At this time, treated water is introduced into the membrane module 12 with the suction valve 14a closed, and then the water in the membrane module 12 is extruded to the outside of the membrane with compressed air in the same manner as in the chemical solution extrusion step. By performing the rinsing process as necessary, the chemical solution in the membrane module 12 can be more reliably removed from the membrane module 12.
[0022]
The treated water introduction step is performed until the inside of the membrane module 12 is filled with water and the membrane permeated water can be sucked by the suction pump 15 without any problem. Thereafter, the treated water introduction valve 23 and the backwash pump 24 are used. Is stopped, both suction valves 14a and 14b are opened, and the suction pump 15 is operated to restart the filtration process.
[0023]
Thus, when performing the chemical | medical solution washing | cleaning of the membrane module 12, a water recovery rate can be raised by extruding and collect | recovering the membrane permeated water which exists in the membrane module 12 etc. at the time of completion | finish of a filtration process with compressed air. Further, since the chemical solution is injected into the membrane module 12 after the membrane permeated water is removed, the chemical solution having a predetermined concentration can be rapidly injected into the membrane module 12 without being diluted by the membrane permeated water. Furthermore, since the chemical solution is extruded to the outside of the membrane by compressed air, and it is not necessary to continue the injection of the chemical solution in order to extrude the chemical solution to the outside of the membrane, it is more effective with a small amount of the chemical solution than before. The chemical cleaning of the membrane module 12 can be performed.
[0024]
Moreover, since the amount of the chemical remaining in the membrane module 12 and the like can be reduced by extruding the chemical with compressed air, it is possible to sufficiently dilute the chemical by introducing the treatment water, and the treatment water introduction step After finishing the process, the filtration process can be restarted without performing the water draining process, and the loss of membrane permeated water due to water draining and the time loss of the water draining process can be eliminated to significantly increase the water recovery rate. it can.
[0025]
In addition, you may make it perform a water discarding process as needed at the time of the filtration process start with the quality of the treated water. During the chemical cleaning operation, solids, chemicals, and the like released from the membrane module 12 into the filtration tank 11 are extracted from the filtration tank 11 through the concentrated water discharge path 27 together with the raw water, and are subjected to predetermined processing. .
[0026]
In this embodiment, the cleaning path 17 is connected to the treated water suction path 13b connected to the lower end portion of the membrane module 12 in which the hollow fiber membranes are arranged in the vertical direction, but connected to the treated water suction path 13a on the upper side. Alternatively, the cleaning path 17 may be branched and connected to both the treated water suction paths 13a and 13b via valves, and the above steps may be performed by opening and closing the valves appropriately. Further, the other suction valve 14 a may be provided in the treated water suction path 13. The structure of the hollow fiber membrane module 12 and the configuration of the membrane filtration device are arbitrary, and various conventional structures and configurations can be employed.
[0027]
【The invention's effect】
As described above, according to the present invention, since the permeated water is recovered by the introduction of compressed air and the chemical liquid is extruded to the outside of the film, the water recovery rate can be improved and the amount of the chemical liquid used And the filtration efficiency can be significantly improved.
[Brief description of the drawings]
FIG. 1 is a system diagram showing one embodiment of a membrane filtration apparatus that can carry out the membrane module cleaning method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Filtration tank, 12 ... Hollow fiber membrane module, 13, 13a, 13b ... Treated water suction path, 14a, 14b ... Suction valve, 15 ... Suction pump, 16 ... Treated water tank, 17 ... Cleaning path, 18 ... Air introduction valve 19 ... Air compressor, 20 ... Chemical liquid injection valve, 21 ... Chemical liquid injection pump, 22 ... Chemical liquid storage tank, 23 ... Treatment water introduction valve, 24 ... Backwash pump, 25 ... Raw water inflow path, 26 ... Treatment water outflow path, 27 ... Concentrated water discharge route

Claims (2)

浸漬型中空糸膜モジュールを薬液により洗浄する方法であって、ろ過工程処理終了時に、膜モジュールの一端から膜内に圧縮空気を導入して膜内の処理水を膜モジュールの他端から処理水槽に回収する処理水回収工程と、該処理水回収工程終了後に膜モジュールの一端から膜内に薬液を注入する薬液注入工程と、該薬液注入工程終了後に膜モジュールの一端から膜内に圧縮空気を導入して前記薬液を膜外部側に押出す薬液押出工程と、該薬液押出工程終了後に膜内に処理水を導入して膜内を水で満たす処理水導入工程とを含むことを特徴とする膜モジュールの洗浄方法。This is a method for washing a submerged hollow fiber membrane module with a chemical solution, and at the end of the filtration process, compressed air is introduced into the membrane from one end of the membrane module, and treated water in the membrane is treated from the other end of the membrane module. A treatment water recovery step for collecting the chemical solution, a chemical solution injection step for injecting a chemical solution into the membrane from one end of the membrane module after completion of the treatment water recovery step, and compressed air from the one end of the membrane module to the membrane after completion of the chemical solution injection step. A chemical solution extrusion step of introducing and extruding the chemical solution to the outside of the membrane; and a treated water introduction step of introducing treated water into the membrane and filling the membrane with water after completion of the chemical solution extrusion step. Membrane module cleaning method. 前記処理水回収工程終了時に、膜モジュール他端からの処理水の回収を終了した状態で膜モジュールへの圧縮空気の導入を継続し、圧縮空気を膜外部側に噴出させる空気逆洗工程を行い、次いで前記薬液注入工程を行う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。 At the end of the treated water recovery process, the process of continuing the introduction of compressed air into the membrane module in a state where the recovery of treated water from the other end of the membrane module has been completed, and performing an air backwashing process in which compressed air is ejected to the outside of the membrane The method for cleaning a membrane module according to claim 1, wherein the chemical solution injection step is then performed.
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