JP2004305886A - Aeration device - Google Patents

Aeration device Download PDF

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Publication number
JP2004305886A
JP2004305886A JP2003102366A JP2003102366A JP2004305886A JP 2004305886 A JP2004305886 A JP 2004305886A JP 2003102366 A JP2003102366 A JP 2003102366A JP 2003102366 A JP2003102366 A JP 2003102366A JP 2004305886 A JP2004305886 A JP 2004305886A
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air
cleaning liquid
diffuser
pipe
cleaning
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JP4530621B2 (en
Inventor
Kazuhisa Nishimori
一久 西森
Seiji Izumi
清司 和泉
Taichi Kamisaka
太一 上坂
Yasunobu Okajima
康信 岡島
Tatsuya Uejima
達也 上島
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Kubota Corp
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Kubota Corp
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    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide aeration device where cleaning of the inside of an aeration pipe can be easily performed. <P>SOLUTION: In the aeration device 7 that supplies air into the aeration pipe 9 immersed in a tank 2 to diffuse the air from air spouts 10 of the aeration pipe 9, an introduction pipeline 15 that introduces air discharged from a blower 11 into the aeration pipe 9, a cleaning liquid injection pipeline 17 that makes a cleaning chemical 27 discharged from a pump 12 flow into the introduction pipeline 15 to inject the chemical into the aeration pipe 9, and a cleaning liquid discharge pipeline 19 that discharges the cleaning chemical 27 in the aeration pipe 9 to the outside of the tank 2 are formed, and a first valve 21 that opens and closes the introduction pipeline 15, a second valve 22 that opens and closes the cleaning liquid injection pipeline 17, and a third valve 23 that opens and closes the cleaning liquid discharge pipeline 19 are installed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば膜分離活性汚泥法等において、槽内混合液を曝気する際に用いられる散気装置に関する。
【０００２】
【従来の技術】
従来、膜分離活性汚泥法においては、図４に示すように、曝気槽４１内に浸漬した膜分離装置４２（膜モジュール）の下方に散気管４３を設け、この散気管４３に空気を供給して、散気管４３の空気噴出口４４から空気を散気する散気装置４５がある。
【０００３】
すなわち、上記散気管４３は水平に配置されており、空気噴出口４４は散気管４３の周壁部を貫通して複数形成されている。曝気槽４１の外部には、散気管４３へ空気を供給するブロア４６が設置されている。上記ブロア４６の吐出口４６ａと散気管４３の一端部との間には給気配管４７が接続されている。また、散気管４３の他端部は閉塞されている。
【０００４】
これによると、ブロア４６を運転することにより、吐出口４６ａから吐出された空気は、給気配管４７を流れて散気管４３に供給され、空気噴出口４４から気泡４８となって曝気槽４１内に噴出する。これにより、生物反応に必要な酸素が槽内混合液４９に供給される。さらに、気泡４８の上昇によって発生する上向流によって膜分離装置４２の濾過膜面が洗浄されるため、膜面が付着物によって閉塞されるのを防止している。
【０００５】
上記の従来形式では、ブロア４６を停止して散気を停止した際、曝気槽４１内の汚泥が空気噴出口４４から散気管４３の内部に侵入する。その後、ブロア４６の運転を再開すると、上記侵入した汚泥は、散気流と共に散気管４３の内部から空気噴出口４４を通って散気管４３の外部へ排出される。しかしながら、ブロア４６の運転と停止とが長期間にわたり繰り返されると、汚泥が少しずつ散気管４３の内周面に堆積する恐れがあるので、維持管理のために、散気管４３を定期的に洗浄する必要があった。このように洗浄が定期的に行われている場合、汚泥による散気管４３内の閉塞を長期間防ぐことが可能であるが、維持管理者の不手際等で洗浄が定期的に行われなかった場合、汚泥が散気管４３の内周面に強固に付着してしまうといった問題があった。
【０００６】
上記のような問題の対策として、散気管４３を、膜分離装置４２の下方から取り出し、さらに曝気槽４１内から外部へ搬出できるように構成されたものがある（例えば、特許文献１参照。）。これによると、散気管４３を取り外して曝気槽４１内から搬出し、この散気管４３内を洗浄した後、曝気槽４１内へ搬入して取り付ける。
【０００７】
【特許文献１】
特開平９−２７６８８９号公報
【０００８】
【発明が解決しようとする課題】
しかしながら上記の従来形式では、散気管４３内を洗浄する場合、散気管４３を、取り外して曝気槽４１内から搬出し、洗浄した後、曝気槽４１内へ搬入して取り付けるといった一連の作業が必要となり、したがって、散気管４３内の洗浄作業に手間がかかるといった問題がある。
【０００９】
本発明は、散気管内の洗浄が容易に行える散気装置を提供することを目的とする。
【００１０】
【課題を解決するための手段】
上記目的を達成するために本発明は、槽内に浸漬された散気管に空気を供給して、散気管の空気噴出口から空気を散気する散気装置であって、槽外に、上記散気管へ空気を供給するブロアと、上記散気管へ洗浄用液を供給するポンプとが設けられ、上記ブロアから吐出された空気を散気管へ導入する導入管路と、上記ポンプから吐出された洗浄用液を散気管へ注入する洗浄用液注入管路と、散気管内の洗浄用液を槽外へ排出する洗浄用液排出管路とが形成され、上記導入管路を開閉する第１の開閉手段と、上記洗浄用液注入管路を開閉する第２の開閉手段と、上記洗浄用液排出管路を開閉する第３の開閉手段とが設けられているものである。
【００１１】
これによると、槽内混合液を曝気する場合、第１の開閉手段によって導入管路を開き、第２の開閉手段によって洗浄用液注入管路を閉じ、第３の開閉手段によって洗浄用液排出管路を閉じた状態で、ブロアを運転する。これにより、ブロアから吐出された空気は、導入管路を流れて散気管内に供給され、空気噴出口から槽内混合液に散気される。
【００１２】
また、散気管内を洗浄する場合、ブロアを停止し、第１の開閉手段によって導入管路を閉じ、第２の開閉手段によって洗浄用液注入管路を開いた状態で、ポンプを駆動する。これにより、ポンプから吐出された洗浄用液が洗浄用液注入管路を流れて散気管の内部に注入される。そして、散気管の内部が洗浄用液で満たされた時点で、ポンプを停止する。これにより、散気管の内部が洗浄用液で満たされ、この状態で一定時間浸漬することによって、散気管の内周面に堆積した閉塞物（汚泥等）が溶解・剥離し、散気管内が浸漬洗浄される。
【００１３】
一定時間浸漬洗浄した後、第１の開閉手段によって導入管路を開くとともに、第２の開閉手段によって洗浄用液注入管路を閉じ、且つ、第３の開閉手段によって洗浄用液排出管路を開いた状態で、ブロアを運転する。これにより、ブロアから吐出された空気は、導入管路を流れて散気管内に供給された後、散気管内に溜まっていた洗浄用液と共に洗浄用液排出管路を通って槽外へ排出される。これにより、散気管内の洗浄用液を確実に槽外へ排出することができる。
【００１４】
上記洗浄用液の排出が終わると、第３の開閉手段によって洗浄用液排出管路を閉じる。これにより、ブロアから吐出された空気は、導入管路を流れて散気管内に供給され、洗浄用液排出管路から排出されずに、空気噴出口から槽内混合液へ散気されるため、槽内混合液に対する曝気が再開される。
【００１５】
このように、散気管を取り外したりすることなく槽内に浸漬したままで、上記散気管内を洗浄用液で洗浄することができ、さらに、散気管内の洗浄用液を残さず容易に槽外へ排出することができるため、散気管内の洗浄が容易に行える。
【００１６】
【発明の実施の形態】
以下、本発明における実施の形態を図１〜図３に基づいて説明する。
１は曝気槽２内に浸漬して設置された膜分離装置（膜モジュール）である。この膜分離装置１は、有機平膜形の分離膜３を使用した複数の膜カートリッジ４を鉛直方向に沿って、且つ所定間隔をあけて平行に配置したものであり、隣接する膜カートリッジ４間に流路を形成している。各膜カートリッジ４は膜透過液流路（図示省略）に連通し、槽内の水頭又はポンプ吸引圧を駆動圧として作動する。
【００１７】
散気装置７は、膜分離装置１の下方領域を囲む散気ケース８と、散気ケース８内の下方に水平に配置された複数の散気管９とを備えている。上記散気管９の周壁部には、複数の空気噴出口１０が貫通して形成されている。
【００１８】
また、曝気槽２の外部には、散気管９内へ空気を供給するブロア１１と、洗浄用薬液２７（例えば次亜塩素酸ナトリウム等）を貯留する薬液タンク１３と、薬液タンク１３内の洗浄用薬液２７を散気管９内へ供給するポンプ１２とが設置されている。
【００１９】
上記ブロア１１の吐出口１１ａと散気管９の一端開口部９ａとの間には導入配管１４が接続され、この導入配管１４によって、ブロア１１から吐出された空気を散気管９へ導入する導入管路１５が形成される。尚、上記導入配管１４は、曝気槽２の上方から曝気槽２内の底部へ垂下された垂下管部１４ａと、この垂下管部１４ａの下端から散気管９の一端開口部９ａに接続された水平管部１４ｂとを有している。
【００２０】
また、上記ポンプ１２の吐出口１２ａには洗浄用液注入配管１６の一端が接続され、他端が上記導入配管１４に上方から接続されて合流している。この洗浄用液注入配管１６によって、上記ポンプ１２から吐出された洗浄用薬液２７を散気管９へ注入する洗浄用液注入管路１７が形成される。
【００２１】
さらに、散気管９の他端開口部９ｂには洗浄用液排出配管１８の一端が接続され、他端は曝気槽２の外部へ突出している。この洗浄用液排出配管１８によって、散気管９内の洗浄用薬液２７を曝気槽２の外部へ排出する洗浄用液排出管路１９が形成される。尚、上記洗浄用液排出配管１８は、散気管９の他端開口部９ｂに接続された水平管部１８ａと、この水平管部１８ａから上向きに立ち上る立上管部１８ｂとを有している。
【００２２】
上記導入配管１４には、導入管路１５を開閉する第１の操作バルブ２１（第１の開閉手段の一例）が設けられている。尚、第１の操作バルブ２１は、ブロア１１から導入配管１４と洗浄用液注入配管１６との合流箇所Ａまでの間に位置している。また、上記洗浄用液注入配管１６には、洗浄用液注入管路１７を開閉する第２の操作バルブ２２（第２の開閉手段の一例）が設けられている。さらに、上記洗浄用液排出配管１８には、洗浄用液排出管路１９を開閉する第３の操作バルブ２３（第３の開閉手段の一例）が設けられている。
【００２３】
以下、上記構成における作用を説明する。
曝気槽２内の混合液２５を曝気する場合、第１の操作バルブ２１を開操作して導入管路１５を開き、第２の操作バルブ２２を閉操作して洗浄用液注入管路１７を閉じ、第３の操作バルブ２３を閉操作して洗浄用液排出管路１９を閉じた状態で、ブロア１１を運転する。これにより、ブロア１１から吐出された空気は、導入管路１５を流れて一端開口部９ａから散気管９内に供給され、各空気噴出口１０から気泡２６となって槽内混合液２５に散気される。これにより、生物反応に必要な酸素が槽内混合液２５に供給される。さらに、気泡２６の上昇によって発生する上向流によって各膜カートリッジ４の分離膜３の膜面が洗浄されるため、膜面が付着物によって閉塞されるのを防止している。
【００２４】
また、散気管９内を洗浄する場合、ブロア１１を停止し、第１の操作バルブ２１を閉操作して導入管路１５を閉じ、第２の操作バルブ２２を開操作して洗浄用液注入管路１７を開いた状態で、ポンプ１２を駆動する。これにより、ポンプ１２から吐出された洗浄用薬液２７は、洗浄用液注入管路１７を流れて合流箇所Ａで導入管路１５に合流し、導入管路１５を通って、一端開口部９ａから散気管９の内部に注入される。そして、散気管９の内部が洗浄用薬液２７で満たされた時点で、ポンプ１２を停止する。これにより、散気管９の内部が洗浄用薬液２７で満たされ、この状態で一定時間浸漬することによって、散気管９の内周面に堆積した閉塞物（汚泥等）が溶解・剥離し、散気管９内が浸漬洗浄される。
【００２５】
尚、上記浸漬洗浄中においては、曝気槽２内にはほとんど流れが無いため混合作用が起こらず、散気管９内に満たされた洗浄用薬液２７が空気噴出口１０から外部へ放出され難く、大部分の洗浄用薬液２７は散気管９内に留まる。また、曝気槽２内の汚泥が空気噴出口１０から散気管９内に少量侵入する可能性もあるが、これに対して洗浄用薬液２７をある程度高濃度にすることにより、洗浄用薬液２７の洗浄効果を一定時間持続させることができる。さらに、上記のように開かれた状態の洗浄用液注入管路１７は、次亜塩素酸ナトリウム等の洗浄用薬液２７の使用に伴って発生するガスの逃げ道となる。
【００２６】
上記のように散気管９の内部を洗浄用薬液２７で一定時間浸漬洗浄した後、第１の操作バルブ２１を開操作して導入管路１５を開くとともに、第２の操作バルブ２２を閉操作して洗浄用液注入管路１７を閉じ、且つ、第３の操作バルブ２３を開操作して洗浄用液排出管路１９を開いた状態で、ブロア１１を運転する。これにより、ブロア１１から吐出された空気は、導入管路１５を流れて散気管９内に供給された後、散気管９内に溜まっていた洗浄用薬液２７と共に洗浄用液排出管路１９を通って曝気槽２の外部へ排出される。これにより、散気管９内の洗浄用薬液２７を確実に曝気槽２の外部へ排出することができる。
【００２７】
上記洗浄用薬液２７の排出が終わると、第３の操作バルブ２３を閉操作して洗浄用液排出管路１９を閉じる。これにより、ブロア１１から吐出された空気は、導入管路１５を流れて散気管９内に供給され、洗浄用液排出管路１９から排出されずに、各空気噴出口１０から気泡２６となって槽内混合液２５へ散気されるため、槽内混合液２５に対する曝気が再開される。
【００２８】
このように、散気管９を取り外したりすることなく洗浄用薬液２７で洗浄することができ、さらに、散気管９内の洗浄用薬液２７を残さず容易に曝気槽２の外部へ排出することができるため、散気管９内の洗浄が容易に行える。
【００２９】
上記実施の形態では、散気管９内を洗浄する場合、ブロア１１を停止し、第１の操作バルブ２１を閉操作して導入管路１５を閉じ、第２の操作バルブ２２を開操作して洗浄用液注入管路１７を開いた状態（この時、洗浄用液排出管路１９は閉じている）で、ポンプ１２を駆動しているが、第１の操作バルブ２１を閉操作して導入管路１５を閉じ、第２の操作バルブ２２を開操作して洗浄用液注入管路１７を開くとともに、第３の操作バルブ２３を開操作して洗浄用液排出管路１９を開いた状態で、ポンプ１２を駆動してもよい。
【００３０】
これによると、上記ポンプ１２の駆動によって、ポンプ１２から吐出された洗浄用薬液２７は、洗浄用液注入管路１７を流れて合流箇所Ａで導入管路１５に合流し、導入管路１５を通って、一端開口部９ａから散気管９の内部に注入される。そして、散気管９の内部が洗浄用薬液２７で満たされた時点で、ポンプ１２を停止する。これにより、散気管９の内部が洗浄用薬液２７で満たされ、この状態で一定時間浸漬することによって、散気管９の内周面に堆積した閉塞物（汚泥等）が溶解・剥離し、散気管９内が浸漬洗浄される。
【００３１】
上記のように散気管９の内部を洗浄用薬液２７で一定時間浸漬洗浄した後、第１の操作バルブ２１を開操作して導入管路１５を開くとともに、第２の操作バルブ２２を閉操作して洗浄用液注入管路１７を閉じ（この際、洗浄用液排出管路１９は開いたままである）、この状態で、ブロア１１を運転する。これにより、散気管９内の洗浄用薬液２７を確実に曝気槽２の外部へ排出することができる。
【００３２】
上記実施の形態では図１，図２に示すように、空気噴出口１０を散気管９の下部に形成しているが、上部又は側部に形成してもよい。また、散気管９の断面形状は円筒状でもよいし、或いは角筒状でもよい。
【００３３】
【発明の効果】
以上のように本発明によると、散気管を取り外したりすることなく槽内に浸漬したままで、上記散気管内を洗浄用液で洗浄することができ、さらに、散気管内の洗浄用液を残さず容易に槽外へ排出することができるため、散気管内の洗浄が容易に行える。
【図面の簡単な説明】
【図１】本発明の実施の形態における散気装置の図である。
【図２】同、散気装置の散気管の断面図である。
【図３】同、散気装置と、この散気装置によって散気される膜分離装置の一部切欠き斜視図である。
【図４】従来の散気装置の図である。
【符号の説明】
２ 曝気槽
７ 散気装置
９ 散気管
１０ 空気噴出口
１１ ブロア
１２ ポンプ
１５ 導入管路
１７ 洗浄用液注入管路
１９ 洗浄用液排出管路
２１ 第１の操作バルブ（第１の開閉手段）
２２ 第２の操作バルブ（第２の開閉手段）
２３ 第３の操作バルブ（第３の開閉手段）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a diffuser used for aerating a mixed solution in a tank, for example, in a membrane separation activated sludge method or the like.
[0002]
[Prior art]
Conventionally, in the membrane separation activated sludge method, as shown in FIG. 4, a diffuser 43 is provided below a membrane separator 42 (membrane module) immersed in an aeration tank 41, and air is supplied to the diffuser 43. Further, there is an air diffuser 45 for diffusing air from the air outlet 44 of the air diffuser 43.
[0003]
That is, the air diffuser 43 is disposed horizontally, and a plurality of air outlets 44 are formed through the peripheral wall of the air diffuser 43. Outside the aeration tank 41, a blower 46 for supplying air to the air diffuser 43 is provided. An air supply pipe 47 is connected between the discharge port 46 a of the blower 46 and one end of the diffuser pipe 43. The other end of the air diffuser 43 is closed.
[0004]
According to this, by operating the blower 46, the air discharged from the discharge port 46 a flows through the air supply pipe 47 and is supplied to the diffuser pipe 43, and becomes a bubble 48 from the air discharge port 44 to form a bubble 48 in the aeration tank 41. Spouts. Thereby, oxygen necessary for the biological reaction is supplied to the mixed solution 49 in the tank. Furthermore, since the filtration membrane surface of the membrane separation device 42 is washed by the upward flow generated by the rise of the bubbles 48, the membrane surface is prevented from being blocked by the deposits.
[0005]
In the above-mentioned conventional type, when the blower 46 is stopped to stop the air diffusion, the sludge in the aeration tank 41 enters the air diffusion pipe 43 from the air jet port 44. Thereafter, when the operation of the blower 46 is restarted, the infiltrated sludge is discharged from the inside of the diffuser tube 43 to the outside of the diffuser tube 43 through the air outlet 44 together with the diffused air flow. However, if the operation and the stop of the blower 46 are repeated for a long period of time, the sludge may gradually accumulate on the inner peripheral surface of the air diffuser 43. Therefore, the air diffuser 43 is periodically cleaned for maintenance. I needed to. When the cleaning is performed regularly as described above, it is possible to prevent the obstruction of the diffuser 43 by the sludge for a long period of time. However, when the cleaning is not performed regularly due to the care of the maintenance manager or the like. However, there is a problem that the sludge adheres strongly to the inner peripheral surface of the air diffuser 43.
[0006]
As a countermeasure against the above-mentioned problem, there is a configuration in which the diffuser tube 43 can be taken out from below the membrane separation device 42 and further carried out of the aeration tank 41 to the outside (for example, see Patent Document 1). . According to this, the air diffuser 43 is detached and taken out of the aeration tank 41, and after cleaning the inside of the air diffuser 43, it is carried into the aeration tank 41 and attached.
[0007]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 9-276889
[Problems to be solved by the invention]
However, in the above-described conventional type, when cleaning the inside of the diffuser tube 43, a series of operations such as removing the diffuser tube 43, carrying it out of the aeration tank 41, cleaning, and then carrying it into the aeration tank 41 and attaching it is necessary. Therefore, there is a problem that it takes time to clean the inside of the air diffuser 43.
[0009]
SUMMARY OF THE INVENTION It is an object of the present invention to provide an air diffuser capable of easily cleaning the inside of an air diffuser.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is an air diffuser that supplies air to an air diffuser immersed in a tank and diffuses air from an air outlet of the air diffuser. A blower for supplying air to the air diffuser and a pump for supplying a cleaning liquid to the air diffuser are provided, and an introduction pipe line for introducing the air discharged from the blower to the air diffuser, and a pump discharged from the pump. A cleaning liquid injection conduit for injecting the cleaning liquid into the diffuser tube and a cleaning liquid discharge conduit for discharging the cleaning liquid in the diffuser tube to the outside of the tank are formed. , A second opening / closing means for opening / closing the cleaning liquid injection pipe, and a third opening / closing means for opening / closing the cleaning liquid discharge pipe.
[0011]
According to this, when the mixed solution in the tank is aerated, the introduction pipe is opened by the first opening / closing means, the washing liquid injection pipe is closed by the second opening / closing means, and the washing liquid is discharged by the third opening / closing means. Operate the blower with the pipe line closed. Thereby, the air discharged from the blower flows through the introduction conduit, is supplied into the air diffuser, and is diffused from the air outlet into the liquid mixture in the tank.
[0012]
When cleaning the inside of the air diffuser, the pump is driven in a state where the blower is stopped, the introduction pipe is closed by the first opening / closing means, and the cleaning liquid injection pipe is opened by the second opening / closing means. Thus, the cleaning liquid discharged from the pump flows through the cleaning liquid injection conduit and is injected into the air diffuser. Then, when the inside of the air diffuser is filled with the cleaning liquid, the pump is stopped. As a result, the inside of the diffuser tube is filled with the cleaning liquid, and by immersing the diffuser tube in this state for a certain period of time, obstructions (sludge, etc.) deposited on the inner peripheral surface of the diffuser tube are dissolved and separated, and the inside of the diffuser tube is removed. Immersion cleaning.
[0013]
After immersion cleaning for a certain time, the first opening / closing means opens the introduction pipe, the second opening / closing means closes the cleaning liquid injection pipe, and the third opening / closing means closes the cleaning liquid discharge pipe. Operate the blower with it open. As a result, the air discharged from the blower flows through the introduction pipe and is supplied into the diffuser pipe, and then discharged out of the tank through the cleaning liquid discharge pipe together with the cleaning liquid accumulated in the diffuser pipe. Is done. Thereby, the cleaning liquid in the air diffuser can be reliably discharged out of the tank.
[0014]
When the discharge of the cleaning liquid is completed, the cleaning liquid discharge conduit is closed by the third opening / closing means. Thereby, the air discharged from the blower flows through the introduction pipe and is supplied into the diffusion pipe, and is not discharged from the cleaning liquid discharge pipe, but is diffused from the air outlet to the mixed liquid in the tank. Then, the aeration of the mixed solution in the tank is restarted.
[0015]
As described above, the inside of the air diffuser can be washed with the cleaning liquid while the air diffuser is not immersed in the tank without removing the air diffuser, and the tank can be easily washed without leaving the cleaning liquid in the air diffuser. Since the air can be discharged to the outside, the inside of the air diffuser can be easily cleaned.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
Reference numeral 1 denotes a membrane separation device (membrane module) immersed in an aeration tank 2. This membrane separation apparatus 1 is configured by arranging a plurality of membrane cartridges 4 using an organic flat membrane type separation membrane 3 in a vertical direction and at a predetermined interval in parallel. A flow path is formed in Each membrane cartridge 4 communicates with a membrane permeated liquid flow path (not shown), and operates using a water head in the tank or a pump suction pressure as a driving pressure.
[0017]
The air diffuser 7 includes an air diffuser case 8 surrounding a lower region of the membrane separation device 1 and a plurality of air diffusers 9 disposed horizontally below the air diffuser case 8. A plurality of air outlets 10 are formed through the peripheral wall of the air diffuser 9.
[0018]
Outside the aeration tank 2, a blower 11 for supplying air into the diffuser 9, a chemical tank 13 for storing a cleaning chemical 27 (for example, sodium hypochlorite, etc.), and a cleaning in the chemical tank 13. A pump 12 for supplying a chemical solution 27 into the air diffuser 9 is provided.
[0019]
An introduction pipe 14 is connected between the discharge port 11 a of the blower 11 and one end opening 9 a of the diffuser pipe 9, and the introduction pipe 14 introduces air discharged from the blower 11 into the diffuser pipe 9. A path 15 is formed. The introduction pipe 14 is connected to a drooping pipe part 14 a that is hung from above the aeration tank 2 to the bottom in the aeration tank 2, and one end opening 9 a of the diffusion pipe 9 from the lower end of the drooping pipe part 14 a. And a horizontal tube portion 14b.
[0020]
Further, one end of a cleaning liquid injection pipe 16 is connected to the discharge port 12 a of the pump 12, and the other end is connected to the introduction pipe 14 from above to join. The cleaning liquid injection pipe 16 forms a cleaning liquid injection pipe line 17 for injecting the cleaning liquid 27 discharged from the pump 12 into the air diffuser 9.
[0021]
Further, one end of a cleaning liquid discharge pipe 18 is connected to the other end opening 9 b of the diffusion tube 9, and the other end protrudes outside the aeration tank 2. With the cleaning liquid discharge pipe 18, a cleaning liquid discharge pipe 19 for discharging the cleaning chemical 27 in the diffuser tube 9 to the outside of the aeration tank 2 is formed. The washing liquid discharge pipe 18 has a horizontal pipe 18a connected to the other end opening 9b of the air diffuser 9 and a rising pipe 18b rising upward from the horizontal pipe 18a. .
[0022]
The introduction pipe 14 is provided with a first operation valve 21 (an example of a first opening / closing unit) that opens and closes the introduction pipe 15. The first operation valve 21 is located between the blower 11 and a junction A of the introduction pipe 14 and the cleaning liquid injection pipe 16. The cleaning liquid injection pipe 16 is provided with a second operation valve 22 (an example of a second opening / closing unit) that opens and closes the cleaning liquid injection pipe 17. Further, the cleaning liquid discharge pipe 18 is provided with a third operation valve 23 (an example of a third opening / closing means) for opening and closing the cleaning liquid discharge pipe 19.
[0023]
Hereinafter, the operation of the above configuration will be described.
When the mixed liquid 25 in the aeration tank 2 is aerated, the first operation valve 21 is opened to open the introduction pipe 15, and the second operation valve 22 is closed to open the cleaning liquid injection pipe 17. The blower 11 is operated in a state in which the third operation valve 23 is closed and the cleaning liquid discharge pipe 19 is closed. As a result, the air discharged from the blower 11 flows through the introduction pipe 15 and is supplied into the diffuser pipe 9 from the one end opening 9a, and is dispersed as bubbles 26 from the air outlets 10 into the mixed liquid 25 in the tank. I'm bothered. Thereby, oxygen necessary for the biological reaction is supplied to the mixed solution 25 in the tank. Furthermore, since the membrane surface of the separation membrane 3 of each membrane cartridge 4 is washed by the upward flow generated by the rise of the bubbles 26, the membrane surface is prevented from being blocked by the attached matter.
[0024]
When cleaning the inside of the air diffuser 9, the blower 11 is stopped, the first operation valve 21 is closed to close the introduction line 15, and the second operation valve 22 is opened to inject the cleaning liquid. The pump 12 is driven with the pipe 17 opened. As a result, the cleaning chemical 27 discharged from the pump 12 flows through the cleaning liquid injection conduit 17 and joins the introduction conduit 15 at the junction A, passes through the introduction conduit 15, and from one end opening 9a. It is injected into the air diffuser 9. Then, when the inside of the air diffuser 9 is filled with the cleaning chemical 27, the pump 12 is stopped. As a result, the inside of the diffuser tube 9 is filled with the cleaning solution 27, and by immersing in this state for a certain period of time, the obstruction (sludge and the like) deposited on the inner peripheral surface of the diffuser tube 9 is dissolved and peeled off. The inside of the trachea 9 is immersed and washed.
[0025]
During the immersion cleaning, there is almost no flow in the aeration tank 2, so that no mixing action occurs, and the cleaning chemical solution 27 filled in the diffuser tube 9 is hardly released from the air jet port 10 to the outside. Most of the cleaning solution 27 remains in the air diffuser 9. Further, there is a possibility that a small amount of sludge in the aeration tank 2 may enter the air diffuser 9 from the air jet port 10, but by increasing the concentration of the cleaning liquid 27 to some extent, the cleaning liquid 27 The cleaning effect can be maintained for a certain period of time. Further, the cleaning liquid injection conduit 17 in the opened state as described above serves as an escape path for gas generated with the use of the cleaning liquid 27 such as sodium hypochlorite.
[0026]
After the inside of the air diffuser 9 is immersed in the cleaning liquid 27 for a certain period of time as described above, the first operation valve 21 is opened to open the introduction conduit 15 and the second operation valve 22 is closed. Then, the blower 11 is operated in a state in which the cleaning liquid injection pipe line 17 is closed and the third operation valve 23 is opened to open the cleaning liquid discharge pipe line 19. As a result, the air discharged from the blower 11 flows through the introduction pipe 15 and is supplied into the air diffuser 9, and then flows through the cleaning liquid discharge pipe 19 together with the cleaning chemical 27 stored in the air diffuser 9. The gas is discharged to the outside of the aeration tank 2. Thereby, the cleaning liquid 27 in the air diffuser 9 can be reliably discharged to the outside of the aeration tank 2.
[0027]
When the cleaning liquid 27 has been discharged, the third operation valve 23 is closed to close the cleaning liquid discharge pipe 19. As a result, the air discharged from the blower 11 flows through the introduction pipe 15 and is supplied into the air diffuser 9, and is not discharged from the cleaning liquid discharge pipe 19 but becomes bubbles 26 from each air outlet 10. Therefore, the aeration of the mixed liquid 25 in the tank is restarted.
[0028]
In this manner, the cleaning liquid 27 can be washed without removing the air diffuser 9 and the cleaning liquid 27 in the air diffuser 9 can be easily discharged to the outside of the aeration tank 2 without leaving. Therefore, the inside of the air diffuser 9 can be easily cleaned.
[0029]
In the above embodiment, when cleaning the inside of the air diffuser 9, the blower 11 is stopped, the first operation valve 21 is closed to close the introduction line 15, and the second operation valve 22 is opened. The pump 12 is driven in a state where the cleaning liquid injection pipe 17 is opened (at this time, the cleaning liquid discharge pipe 19 is closed), and the first operation valve 21 is closed and introduced. A state in which the pipe 15 is closed, the second operation valve 22 is opened to open the cleaning liquid injection pipe 17, and the third operation valve 23 is opened to open the cleaning liquid discharge pipe 19. Then, the pump 12 may be driven.
[0030]
According to this, the cleaning chemical 27 discharged from the pump 12 by the driving of the pump 12 flows through the cleaning liquid injection pipe 17 and joins the introduction pipe 15 at the junction A, and the introduction pipe 15 is Then, it is injected into the inside of the air diffuser 9 from one end opening 9a. Then, when the inside of the air diffuser 9 is filled with the cleaning chemical 27, the pump 12 is stopped. As a result, the inside of the diffuser tube 9 is filled with the cleaning solution 27, and by immersing in this state for a certain period of time, the obstruction (sludge and the like) deposited on the inner peripheral surface of the diffuser tube 9 is dissolved and peeled off. The inside of the trachea 9 is immersed and washed.
[0031]
After the inside of the air diffuser 9 is immersed in the cleaning liquid 27 for a certain period of time as described above, the first operation valve 21 is opened to open the introduction conduit 15 and the second operation valve 22 is closed. Then, the cleaning liquid injection pipe 17 is closed (at this time, the cleaning liquid discharge pipe 19 is kept open), and the blower 11 is operated in this state. Thereby, the cleaning liquid 27 in the air diffuser 9 can be reliably discharged to the outside of the aeration tank 2.
[0032]
In the above embodiment, as shown in FIGS. 1 and 2, the air ejection port 10 is formed at the lower part of the air diffuser 9, but may be formed at the upper part or the side part. The cross-sectional shape of the air diffuser 9 may be cylindrical or rectangular.
[0033]
【The invention's effect】
As described above, according to the present invention, it is possible to wash the inside of the diffuser tube with the cleaning liquid while immersing it in the tank without removing the diffuser tube, and further, the cleaning liquid in the diffuser tube is removed. Since the water can be easily discharged out of the tank without being left, the inside of the air diffuser can be easily cleaned.
[Brief description of the drawings]
FIG. 1 is a diagram of an air diffuser according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of an air diffuser tube of the air diffuser.
FIG. 3 is a partially cutaway perspective view of the air diffuser and a membrane separation device diffused by the air diffuser.
FIG. 4 is a diagram of a conventional air diffuser.
[Explanation of symbols]
2 Aeration tank 7 Air diffuser 9 Air diffuser 10 Air outlet 11 Blower 12 Pump 15 Introductory line 17 Cleaning liquid injection line 19 Cleaning liquid discharge line 21 First operation valve (first opening / closing means)
22 Second operating valve (second opening / closing means)
23 third operating valve (third opening / closing means)

Claims (1)

槽内に浸漬された散気管に空気を供給して、散気管の空気噴出口から空気を散気する散気装置であって、槽外に、上記散気管へ空気を供給するブロアと、上記散気管へ洗浄用液を供給するポンプとが設けられ、上記ブロアから吐出された空気を散気管へ導入する導入管路と、上記ポンプから吐出された洗浄用液を散気管へ注入する洗浄用液注入管路と、散気管内の洗浄用液を槽外へ排出する洗浄用液排出管路とが形成され、上記導入管路を開閉する第１の開閉手段と、上記洗浄用液注入管路を開閉する第２の開閉手段と、上記洗浄用液排出管路を開閉する第３の開閉手段とが設けられていることを特徴とする散気装置。An air diffuser that supplies air to an air diffuser immersed in a tank and diffuses air from an air outlet of the air diffuser, and a blower that supplies air to the air diffuser outside the tank. A pump for supplying a cleaning liquid to the air diffuser is provided, an introduction pipe for introducing the air discharged from the blower to the air diffusion pipe, and a cleaning pipe for injecting the cleaning liquid discharged from the pump to the air diffusion pipe. A first opening / closing means for opening and closing the introduction conduit, wherein a liquid injection conduit and a cleaning liquid discharge conduit for discharging the cleaning liquid in the diffuser tube to the outside of the tank are formed; An air diffuser, comprising: a second opening / closing means for opening / closing a passage; and a third opening / closing means for opening / closing the washing liquid discharge pipe.
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