JP2009172580A - Air diffuser - Google Patents

Air diffuser Download PDF

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JP2009172580A
JP2009172580A JP2008280783A JP2008280783A JP2009172580A JP 2009172580 A JP2009172580 A JP 2009172580A JP 2008280783 A JP2008280783 A JP 2008280783A JP 2008280783 A JP2008280783 A JP 2008280783A JP 2009172580 A JP2009172580 A JP 2009172580A
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air
diffuser
water
diffusing
blow
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JP5088296B2 (en
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Itaru Sakai
至 坂井
Takeshi Tsuji
猛志 辻
Masanori Nagafuji
雅則 長藤
Kazuaki Ohashi
一聡 大橋
Minoru Yamamoto
稔 山本
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JFE Engineering Corp
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JFE Engineering Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23128—Diffusers having specific properties or elements attached thereto
    • B01F23/231281—Diffusers having specific properties or elements attached thereto made of or comprising a biocide
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2311—Mounting the bubbling devices or the diffusers
    • B01F23/23114—Mounting the bubbling devices or the diffusers characterised by the way in which the different elements of the bubbling installation are mounted
    • B01F23/231143—Mounting the bubbling elements or diffusors, e.g. on conduits, using connecting elements; Connections therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23123—Diffusers consisting of rigid porous or perforated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23123—Diffusers consisting of rigid porous or perforated material
    • B01F23/231231—Diffusers consisting of rigid porous or perforated material the outlets being in the form of perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23126—Diffusers characterised by the shape of the diffuser element
    • B01F23/231262—Diffusers characterised by the shape of the diffuser element having disc shape
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Activated Sludge Processes (AREA)
  • Detergent Compositions (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air diffuser which has pores capable of achieving a high oxygen transfer efficiency, hardly causes clogging, and enables long-term stable operation. <P>SOLUTION: The air diffuser comprises air diffusing plates 4 disposed in an aeration tank 12 and receiving supply of pressure air from diffusing air supply piping 3 to release air bubbles from slits 4a, a blow water supply means 5 for supplying blow water into the diffusing air supply piping 3, and an insertion pipe 7 where its upper end communicates with the air diffusing plate 4 and its lower end is inserted into the diffusing air supply piping 3 to discharge the blow water, supplied into the diffusing air supply piping 3, from the air diffusing plates 4. The slits 4a formed in the air diffusing plate 4 have a shape of a rectangle whose short side length is set to 0.03-0.15 mm. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、散気板の散気面に付着した汚れ成分を除去し、長期かつ安定的に酸素を供給することができる散気装置に関する。   The present invention relates to an air diffuser capable of removing dirt components adhering to an air diffuser surface of an air diffuser plate and supplying oxygen stably for a long period of time.

下水処理施設において汚水中の窒素化合物や炭素化合物を除去するために、微生物による分解、吸着作用を利用した活性汚泥法が用いられている。活性汚泥中の微生物が活動するためには微生物に酸素を与える必要がある。散気装置は、下水処理施設の曝気槽の底部等に設置されて水中に酸素を供給する装置である。散気装置には、散気面が膜タイプの散気装置（特許文献１）と、散気面が金属薄板タイプの散気装置（特許文献２）が存在する。金属薄板タイプの散気装置は、散気による圧損が少なく、かつ耐久性および保守点検の容易性において優れている。   In order to remove nitrogen compounds and carbon compounds in sewage at a sewage treatment facility, an activated sludge method utilizing decomposition and adsorption by microorganisms is used. In order for the microorganisms in the activated sludge to be active, it is necessary to give oxygen to the microorganisms. The air diffuser is an apparatus that is installed at the bottom of an aeration tank of a sewage treatment facility and supplies oxygen into water. There are two types of diffusers: a diffuser with a film diffuser surface (Patent Document 1) and a diffuser with a metal thin plate type diffuser surface (Patent Document 2). The thin metal plate type air diffuser has less pressure loss due to air diffused, and is excellent in durability and ease of maintenance and inspection.

散気装置は、長期間にわたって曝気運転を継続すると、汚れ成分が膜または金属薄板の微細孔の内部および表面に付着して目詰まりを起こす。目詰まりを起こす汚れ成分の多くは微生物により形成されるスライムであり、これが散気孔を閉塞させる。このスライムの付着力は強く、ガス圧を高めてもスライムを剥離することはできない。   When the aeration apparatus continues aeration operation for a long period of time, the dirt component adheres to the inside and the surface of the fine holes of the film or the metal thin plate, thereby causing clogging. Most of the soil components that cause clogging are slimes formed by microorganisms, which block the air holes. The slime has a strong adhesive force, and the slime cannot be peeled off even if the gas pressure is increased.

膜タイプの散気装置では、散気装置の送気操作によってメンブランを伸長または収縮させ、膜の微細孔の内部および表面に付着した微生物由来のスライムを取り除く方法が開示されている（特許文献３）。   In the membrane-type air diffuser, a method is disclosed in which the membrane is elongated or contracted by the air-feeding operation of the air diffuser to remove the microorganism-derived slime attached to the inside and the surface of the micropores of the membrane (Patent Document 3). ).

しかし、金属薄板タイプの散気装置では、散気面が伸縮性のない剛体であるため、上述したような目詰まり防止処置を施すことはできない。現状では、金属薄板タイプの散気装置において微生物が増殖して目詰まりが発生した場合には、散気装置を水面上に引き上げて散気薄板を清掃しなければならず、散気装置の維持管理に多大な労力と費用を要する。   However, in the thin metal plate type air diffuser, since the air diffused surface is a rigid body having no elasticity, the above-described clogging prevention treatment cannot be performed. At present, when clogging occurs due to the growth of microorganisms in a thin metal plate type diffuser, the diffuser plate must be cleaned by lifting the diffuser onto the water surface. Management requires a lot of labor and expense.

また、膜タイプおよび金属薄板タイプの両方において、酸素移動効率を高めるために散気面の気孔径を小さくする必要があるが、気孔径が小さくなればなるほど目詰まりが起こりやすくなる。目詰まりの起こりやすい散気装置は、水面上に引き上げて散気薄板を頻繁に清掃しなければならない。
特開２００３−３２０３８８号公報 特開２００６−６１８１７号公報 特開２００４−３１３９３８号公報 In both the membrane type and the thin metal plate type, it is necessary to reduce the pore diameter of the diffuser surface in order to increase the oxygen transfer efficiency. However, the smaller the pore diameter, the more likely clogging occurs. Air diffusers that are prone to clogging must be lifted above the surface of the water and frequently cleaned.
JP 2003-320388 A JP 2006-61817 A JP 2004-313938 A

このように、従来の散気装置は、目詰まりの問題に対して十分な解決手段を提供してこなかった。本発明の目的は、高い酸素移動効率を達成することができる微細孔を備え、かつ目詰まりが起こりにくく、長期かつ安定的に運転することができる散気装置を提供することにある。   Thus, the conventional diffuser has not provided a sufficient solution to the clogging problem. An object of the present invention is to provide an air diffuser that has micropores that can achieve high oxygen transfer efficiency, is less likely to be clogged, and can be operated stably for a long period of time.

発明者は上記の課題を解決するために、水あるいは薬液などの洗浄水等を散気用給気配管内に注入し、これを散気用の圧力空気によって散気板側に供給することによって散気板を定期的に自動洗浄することを考えた。そして、これを実現するためにための具体的手段として、一端が散気板に連通し、他端が散気用給気配管内に挿入される内挿管を設けることを考えた。
また、上記の散気板の自動洗浄を効果的に行ない、長期間運転したとしても目詰まりが生じにくくするため、散気板に設ける微細孔についても検討し、その最適寸法を見出した。
本発明は係る知見に基づいてなされたものであり、具体的には以下の構成を備えてなるものである。 In order to solve the above problems, the inventor injects water or cleaning water such as a chemical solution into the air supply pipe for air diffusion, and supplies the air to the air diffuser plate side with the pressure air for air diffusion. We considered to automatically clean the air plate regularly. As a specific means for realizing this, it has been considered to provide an intubation tube in which one end communicates with the air diffuser plate and the other end is inserted into the air supply pipe for air diffusion.
Moreover, in order to effectively perform the automatic cleaning of the diffuser plate and to prevent clogging even if it is operated for a long period of time, the micropores provided in the diffuser plate were also examined, and the optimum dimensions were found.
The present invention has been made on the basis of such knowledge, and specifically has the following configuration.

（１）本発明に係る散気装置は、曝気槽内に配置されて散気用給気配管から圧力空気の供給を受けてスリットから気泡を放出する散気板と、前記散気用給気配管内へブロー水を供給するブロー水供給手段と、上端が前記散気板側に連通され、下端が前記散気用給気配管内に内挿されて前記散気用給気配管内に供給されたブロー水を前記散気板から排出する内挿管とを備え、前記散気板に形成されたスリットは矩形状からなり、短辺の長さが０．０３ｍｍ〜０．１５ｍｍに設定されていることを特徴とするものである。
なお、前記内挿管の下端部は、傾斜した吸い込み面を有してもよい。さらにまた、前記内挿管の管壁に通気孔を設けてもよい。 (1) An air diffuser according to the present invention includes an air diffuser arranged in an aeration tank and receiving air pressure from an air diffuser supply pipe to release bubbles from a slit, and the air supply for the air diffuser. Blow water supply means for supplying blow water into the pipe, and a blow pipe having an upper end communicating with the diffuser plate side and a lower end inserted into the diffuser air supply pipe and supplied into the diffuser air supply pipe An internal intubation for discharging water from the diffuser plate, the slit formed in the diffuser plate has a rectangular shape, and the length of the short side is set to 0.03 mm to 0.15 mm. It is a feature.
Note that the lower end portion of the intubation tube may have an inclined suction surface. Furthermore, a vent hole may be provided in the tube wall of the internal intubation.

（２）また、上記（１）に記載のものにおいて、スリットの長辺の長さが０．１ｍｍ〜１．５ｍｍに設定されていることを特徴とするものである。 (2) Further, in the above (1), the length of the long side of the slit is set to 0.1 mm to 1.5 mm.

本発明の散気装置は、散気板に矩形状のスリットを形成し、その短辺の長さを０．０３ｍｍ〜０．１５ｍｍに設定すると共に、上端が散気板側に連通され下端が散気用給気配管内に内挿された内挿管を備えたことにより、定期的な水ブローを効果的に行なうことが可能となり、これによって高い酸素移動効率を維持しつつ散気板の目詰まりを長期間に亘って防止することができる。   In the air diffuser of the present invention, a rectangular slit is formed in the air diffuser plate, the length of the short side is set to 0.03 mm to 0.15 mm, the upper end is communicated with the diffuser plate side, and the lower end is The provision of the internal intubation inserted in the air supply piping for the air diffusion makes it possible to effectively perform periodic water blowing, thereby clogging the air diffusion plate while maintaining high oxygen transfer efficiency. Can be prevented over a long period of time.

以下、本発明の実施の形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

１．散気装置
図１は、本実施の形態に係る散気装置を示す模式図である。本実施の形態の散気装置１は、ガス供給手段２とガス供給手段２から供給される空気を散気板４へと導く散気用給気配管３（ヘッダー管）と、散気用給気配管３から圧力空気の供給を受けて微細気泡を放出する散気板４と、上端が散気板４に連通され下端が前記散気用給気配管３内に内挿された内挿管７と、散気用給気配管３にブロー水供給管１４を介してブロー水を供給するブロー水供給手段５とを備えている。
散気用給気配管３には開閉弁１５が、またブロー水供給管１４には開閉弁１６がそれぞれ設けられている。
以下、散気装置１の主な構成について詳細に説明する。 1. Air diffuser FIG. 1 is a schematic diagram showing an air diffuser according to the present embodiment. The air diffuser 1 according to the present embodiment includes a gas supply means 2, an air supply pipe 3 (header pipe) for introducing air supplied from the gas supply means 2 to an air diffuser plate 4, and an air supply for air diffusion. A diffuser plate 4 that receives supply of compressed air from the air pipe 3 and discharges fine bubbles, and an intubation tube 7 whose upper end communicates with the diffuser plate 4 and whose lower end is inserted into the diffuser air supply pipe 3. And a blow water supply means 5 for supplying blow water to the diffuser air supply pipe 3 via the blow water supply pipe 14.
An open / close valve 15 is provided in the air supply pipe 3 for diffusion, and an open / close valve 16 is provided in the blow water supply pipe 14.
Hereinafter, the main configuration of the air diffuser 1 will be described in detail.

＜散気板＞
散気板４は、膜タイプまたは金属薄板タイプなど、いかなる形態の散気板であってもよい。例えば、散気板４が金属薄板タイプの場合、機械加工によって形成したスリットを有する金属薄板が用いられる。ガス供給手段２より供給された空気は、散気用給気配管３から内挿管７を通して散気板４に送気され、散気板４の散気面に点在する複数のスリットから放出される。 <Air diffuser>
The diffuser plate 4 may be any form of diffuser plate such as a membrane type or a thin metal plate type. For example, when the diffuser plate 4 is a thin metal plate type, a thin metal plate having slits formed by machining is used. The air supplied from the gas supply means 2 is supplied to the diffuser plate 4 from the diffuser supply pipe 3 through the inner tube 7, and is released from a plurality of slits scattered on the diffuser surface of the diffuser plate 4. The

図２は散気板４の平面図、図３は図２の丸で囲んだＡ部を拡大して示す拡大図である。図３に示すように、散気板４には多数の矩形状のスリット４ａが設けられており、その長辺の長さをａ、短辺の長さをｂとすると、ａが０．１ｍｍ〜１．５ｍｍ、ｂが０．０３ｍｍ〜０．１５ｍｍになるように設定されている。スリットの短辺及び長辺の長さをこのように設定した理由は以下の通りである。   FIG. 2 is a plan view of the diffuser plate 4, and FIG. 3 is an enlarged view showing an A portion surrounded by a circle in FIG. As shown in FIG. 3, the diffuser plate 4 is provided with a large number of rectangular slits 4a. When the length of the long side is a and the length of the short side is b, a is 0.1 mm. -1.5 mm and b are set to be 0.03 mm to 0.15 mm. The reason why the lengths of the short side and the long side of the slit are set in this way is as follows.

散気板４に設ける微細孔の形状を矩形状のスリットにした場合、スリットに付着した汚れをブロー水によって除去してスリットの閉塞を抑制する閉塞抑制効果は、スリットの短辺の長さによって支配され、短辺の長さが長いほど閉塞抑制効果は高くなる。
他方、スリットの短辺の長さが長くなると、気泡径が大きくなるため酸素移動効率は低下する。
したがって、散気板４に設けるスリットの短辺の長さは、閉塞抑制効果が高く、かつ酸素移動効率も高いものであることが必要となる。
そこで、高い酸素移動効率（２５％以上）が得られ、かつ閉塞による圧損上昇を抑える（通気開始１００日後の圧損上昇量が１００mmAq以下にする）ためのスリット短辺の長さを後述の実施例に示す実験によって求めたところ、短辺の長さが０．０３ｍｍ〜０．１５ｍｍにすればよいことが判明した。また、スリットの長辺の長さについては、これが長すぎると酸素移動効率に悪影響を与えるので影響を与えない範囲として０．１ｍｍ〜１．５ｍｍに設定した。 When the shape of the fine holes provided in the diffuser plate 4 is a rectangular slit, the obstruction suppressing effect that suppresses the obstruction of the slit by removing dirt adhering to the slit with blow water depends on the length of the short side of the slit. The longer the length of the short side is, the higher the blocking effect becomes.
On the other hand, when the length of the short side of the slit is increased, the bubble diameter is increased and the oxygen transfer efficiency is lowered.
Therefore, the length of the short side of the slit provided in the diffuser plate 4 is required to have a high blocking suppression effect and high oxygen transfer efficiency.
Therefore, the length of the short side of the slit for obtaining a high oxygen transfer efficiency (25% or more) and suppressing the increase in pressure loss due to blockage (the amount of increase in pressure loss after 100 days of ventilation is 100 mmAq or less) will be described later. As a result of the experiment shown in Fig. 4, it was found that the length of the short side should be 0.03 mm to 0.15 mm. Moreover, about the length of the long side of a slit, since this will have a bad influence on oxygen transfer efficiency if it is too long, it set to 0.1 mm-1.5 mm as a range which does not have influence.

＜内挿管＞
本実施例における散気装置１は、内挿管７を備えているために、散気用給気配管３を水で満管にしなくても水を散気孔に供給することができる。従って、大量の水は必要とせず、特に、抗菌物質を含む水溶液を供給する場合は、少ない抗菌物質で短時間かつ効率的に微生物を除去することができる。この結果、散気装置を水面上に引き上げて頻繁に清掃する必要がなく、散気装置を水面下で長期かつ安定的に運転することができる。 <Intubation>
Since the air diffuser 1 according to this embodiment includes the inner intubation tube 7, water can be supplied to the air diffuser holes without filling the air diffuser air supply pipe 3 with water. Therefore, a large amount of water is not required. In particular, when an aqueous solution containing an antibacterial substance is supplied, microorganisms can be efficiently removed in a short time with a small amount of the antibacterial substance. As a result, it is not necessary to lift the air diffuser above the water surface and clean it frequently, and the air diffuser can be operated stably for a long time under the water surface.

なお、内挿管７が無い場合において、散気板４を洗浄するための水を供給しようとすると、前述のように散気用給気配管３を満水にする必要があるだけでなく、満水にした水を抜くための工夫が必要となる。仮に、水を抜くための手段が無い場合には、散気板４が取り付けられている散気用給気配管内に水が残留し、管路が細くなってしまい、適切な散気ができなくなる。   In addition, when there is no inner intubation 7 and it is going to supply the water for washing | cleaning the diffuser board 4, not only the air supply piping 3 for aeration needs to be filled as mentioned above but it is also filled with water. It is necessary to devise in order to drain the water. If there is no means for draining water, water remains in the air supply piping for the air diffuser to which the air diffuser plate 4 is attached, the pipe line becomes thin, and appropriate air diffusion cannot be performed. .

図４は、内挿管７の一例を示す一部断面図である。内挿管７は、上端が散気板４に連通され、下端が散気用給気配管３内に内挿され、下端部には傾斜した吸い込み面８を有し、かつ管壁に通気孔９を有している。もっとも、内挿管７に設ける通気孔９は必須ではなく通気孔９が無くてもよく、後述するように通気孔９がある場合と無い場合では内挿管７へのブロー水の揚水の態様が異なる。   FIG. 4 is a partial cross-sectional view showing an example of the inner intubation 7. The inner insertion tube 7 has an upper end communicating with the air diffusion plate 4, a lower end inserted into the air supply pipe 3 for diffusion, an inclined suction surface 8 at the lower end, and a vent hole 9 in the tube wall. have. However, the vent hole 9 provided in the inner intubation tube 7 is not essential, and the vent hole 9 may not be provided. As described later, the mode of pumping the blow water to the inner intubation tube 7 differs depending on whether the vent hole 9 is present or not. .

内挿管７は、空気の散気板４への供給路であるとともに、水ブロー処理中は供給されたブロー水を散気板４から排出する機能を有している。   The internal intubation 7 is a supply path to the air diffusion plate 4 and has a function of discharging the supplied blow water from the diffusion plate 4 during the water blowing process.

内挿管７は、散気用給気配管３と一体に形成しても、着脱可能な別部材としてもよい。着脱可能な別部材とする場合、内挿管７は、散気用給気配管３に予め設けた挿入口に挿入して固定することができる。内挿管７の固定方法には、特に制限はなく、あらゆる固定方法が含まれる。例えば、内挿管７の側面に固定用締付け部材１０を予め溶接し、散気用給気配管側に取付ブラケット１１を予め溶接しておくことにより、内挿管７をねじ込んで散気用給気配管３に固定することができる。
同様に、散気板４も内挿管７と一体に形成したり、着脱可能にしたりすることができる。また、内挿管の材質には、特に制限はなく、好ましくは、プラスチックまたはステンレス鋼、チタン等の金属から形成される。 The inner intubation 7 may be formed integrally with the air supply pipe 3 for diffusing or may be a separate member that can be attached and detached. When it is set as another member which can be attached or detached, the inner intubation tube 7 can be inserted and fixed in the insertion port previously provided in the air supply piping 3 for aeration. There is no restriction | limiting in particular in the fixing method of the intubation tube 7, All fixing methods are included. For example, the fixing tightening member 10 is pre-welded to the side surface of the inner intubation tube 7 and the mounting bracket 11 is pre-welded to the diffuser air supply piping side, so that the inner intubation tube 7 is screwed and the air supply piping for air diffusion is installed. 3 can be fixed.
Similarly, the diffuser plate 4 can be formed integrally with the inner intubation tube 7 or can be attached and detached. Moreover, there is no restriction | limiting in particular in the material of an intubation tube, Preferably, it forms from metals, such as plastic or stainless steel, titanium.

内挿管７の下端部は吸込み面８を備えている。散気用給気配管３には複数個の散気板４が設置されているが、散気用給気配管３は必ずしも水平に設置されているとは限らず、内挿管７の下端が水面に対して同じ高さに配置されない場合がある。図５に示したように、内挿管下端の吸込み面８が傾斜していない場合は、下端部が水面に接するか水面下にある内挿管７からしか吸い上げ（本明細書において「吸い上げ」と表現する場合には、「押し上げ」を含む場合がある）が起こらないため、全ての散気板４にブロー水が均一に供給されず、ブロー水が供給されない一部の散気板で目詰まりが進行する恐れがある。
一方、図６に示したように、内挿管下端の吸込み面８が傾斜している場合は、水面が吸込み面８の上端と下端の間にあればブロー水を吸い上げ可能であり、水面に対する内挿管下端の配置に上下が生じた場合でも、一定範囲であれば全ての内挿管からの吸上げが可能であり、散気板４に均一なブローが可能である。したがって、吸込み面８が傾斜している場合は、散気用給気配管３の水平方向の設置精度の許容範囲が大きくなる。 The lower end portion of the inner intubation 7 has a suction surface 8. A plurality of diffuser plates 4 are installed in the diffuser supply pipe 3, but the diffuser supply pipe 3 is not necessarily installed horizontally, and the lower end of the intubation pipe 7 is the water surface. May not be arranged at the same height. As shown in FIG. 5, when the suction surface 8 at the lower end of the intubation tube is not inclined, the lower end portion is sucked up only from the inner tube 7 that is in contact with the water surface or under the water surface (expressed as “sucking up” in this specification). In some cases, “push-up” may be included), so that the blow water is not uniformly supplied to all the diffuser plates 4, and clogging is caused by some diffuser plates to which blow water is not supplied. There is a risk of progress.
On the other hand, as shown in FIG. 6, when the suction surface 8 at the lower end of the intubation tube is inclined, the blow water can be sucked up if the water surface is between the upper end and the lower end of the suction surface 8. Even when the lower end of the intubation is arranged up and down, suction from all the inner intubations is possible within a certain range, and uniform blow to the diffuser plate 4 is possible. Therefore, when the suction surface 8 is inclined, the allowable range of the installation accuracy in the horizontal direction of the air supply pipe 3 for air diffusion becomes large.

また、図６に示すように、水位が吸込み面８の上端と下端の間にある場合はブロー速度の大きい気水混相のブローとなるが、図７の右図に示すように水位が吸込み面８より高くなった場合は、水だけを吸い上げるため、空気が混相しない水押出しブローとなる。これに対し、図７の左図のように内挿管７の管壁に通気孔９が設置されている場合は、水位が吸込み面８より高い場合においても通気孔９から空気が入るため、ブロー速度の大きい気水混相のブローをすることができる。   In addition, as shown in FIG. 6, when the water level is between the upper end and the lower end of the suction surface 8, the air-water mixed phase is blown at a high blow speed. However, as shown in the right diagram of FIG. When it becomes higher than 8, since only water is sucked up, it becomes a water extrusion blow in which air is not mixed. On the other hand, when the vent hole 9 is provided in the tube wall of the inner intubation tube 7 as shown in the left diagram of FIG. 7, air enters from the vent hole 9 even when the water level is higher than the suction surface 8. A high-speed air-water mixed phase can be blown.

通気孔９の形状および大きさは、特に制限はなく、任意の形状および大きさとすることができる。例えば、内挿管７の全長を200mm、内挿管７の内径を13mmとした場合、通気孔９は直径1mm〜10mm、好ましくは2mm〜7mmの円形形状とすることができる。また、通気孔９の位置は、特に制限はなく、任意の位置とすることができる。例えば、全長200mm、内径13mmの内挿管が、内径80mmの散気用給気配管内に装着され、内挿管の下端が散気用給気配管の内底部に接している場合、通気孔９は、内挿管の下端から10mm〜75mm、好ましくは30〜70mmの位置に設けることができる。
また、散気用給気配管内は加圧されているので、通気孔９の位置は、水ブローおよびガスの流れの方向に対して正面側であっても背面側であってもよい。 There is no restriction | limiting in particular in the shape and magnitude | size of the vent hole 9, It can be set as arbitrary shapes and magnitude | sizes. For example, when the total length of the inner intubation tube 7 is 200 mm and the inner diameter of the inner intubation tube 7 is 13 mm, the vent hole 9 can have a circular shape with a diameter of 1 mm to 10 mm, preferably 2 mm to 7 mm. The position of the vent hole 9 is not particularly limited and can be set to an arbitrary position. For example, when an intubation tube having a total length of 200 mm and an inner diameter of 13 mm is mounted in an air supply pipe for air diffusion with an inner diameter of 80 mm, and the lower end of the inner tube is in contact with the inner bottom portion of the air supply pipe for air diffusion, It can be provided at a position of 10 mm to 75 mm, preferably 30 to 70 mm from the lower end of the intubation tube.
Further, since the inside of the air supply piping for air diffusion is pressurized, the position of the vent hole 9 may be on the front side or the back side with respect to the direction of water blow and gas flow.

傾斜した吸い込み面８の下端は、散気用給気配管３の内底近傍に位置し、たとえ水位が低くても、確実にブロー水を内挿管７内に吸い上げることができるようにする。傾斜した吸い込み面８の下端は、散気用給気配管３の内底より0〜10mm上方にあることが好ましい。
傾斜した吸い込み面８の垂直方向に対する傾斜角度θに特に制限はないが、内挿管７は空気の供給路でもあるため、空気を十分に内挿管７内に送気できるような傾斜角度θにすることが好ましい。傾斜角度θは、例えば10〜85度、好ましくは30〜80度とすることができる。 The lower end of the inclined suction surface 8 is located in the vicinity of the inner bottom of the air supply pipe 3 for diffusing, so that even if the water level is low, the blow water can be surely sucked into the inner tube 7. The lower end of the inclined suction surface 8 is preferably 0 to 10 mm above the inner bottom of the air supply pipe 3 for air diffusion.
Although there is no particular limitation on the inclination angle θ of the inclined suction surface 8 with respect to the vertical direction, since the intubation tube 7 is also an air supply path, the inclination angle θ is such that air can be sufficiently supplied into the intubation tube 7. It is preferable. The inclination angle θ can be, for example, 10 to 85 degrees, preferably 30 to 80 degrees.

＜ブロー水供給手段＞
ブロー水供給手段５はブロー水供給管１４を介して散気用給気配管３にブロー水を供給する装置であって、散気用給気配管３の空気圧に打ち勝ってブロー水を散気用給気配管３内に供給できるようになっている。ブロー水供給手段５としては、例えば水の貯留槽に送水ポンプを設けたものがある。
ブロー水供給手段５より供給されたブロー水は、ブロー水供給管１４を介して散気用給気配管３に流れ込み、散気用給気配管３内の圧力が所定の圧力よりも高くなったときに、散気用給気配管３から内挿管７を通して散気板４に送水され、空気と同様、散気板４の散気面に点在する複数の散気孔から放出される。 <Blow water supply means>
The blow water supply means 5 is a device for supplying blow water to the air supply pipe 3 for air diffusion via the blow water supply pipe 14, for overcoming the air pressure of the air supply pipe 3 for air diffusion. The air supply pipe 3 can be supplied. As the blow water supply means 5, there is, for example, a water storage tank provided with a water pump.
The blow water supplied from the blow water supply means 5 flows into the air supply pipe 3 through the blow water supply pipe 14 and the pressure in the air supply pipe 3 becomes higher than a predetermined pressure. Sometimes, air is supplied from the air supply pipe 3 through the inner intubation 7 to the air diffuser plate 4 and is released from a plurality of air diffuser holes scattered on the air diffuser surface of the air diffuser plate 4 like air.

２．散気装置の運転方法
通常の散気運転時においては、開閉弁１５を開放し、開閉弁１６を閉止して運転する。
また、散気板４を水ブローするブロー運転時には、開閉弁１６を開放してブロー水を散気用給気配管３に供給することによって、散気用空気とブロー水を内挿管７を介して散気板４に供給する。
本発明の散気装置１は、ブロー水供給手段５からブロー水を散気板４に定期的に供給することによって、散気装置を水面上に引き上げることなく、散気孔に付着した微生物を除去することができる。なお、ブロー水の供給頻度に特に制限はないが、好ましくは数時間から数日毎にブロー水を散気用給気配管３内に供給する。 2. Operation Method of Air Diffuser A normal air diffuser is operated by opening the on-off valve 15 and closing the on-off valve 16.
Further, at the time of the blow operation in which the air diffuser plate 4 is blown with water, the on-off valve 16 is opened and the blow water is supplied to the air diffuser supply pipe 3 so that the air diffused and the blow water are passed through the inner tube 7. And supply to the diffuser plate 4.
The air diffuser 1 according to the present invention removes microorganisms adhering to the air diffuser without pulling up the air diffuser onto the water surface by periodically supplying blow water from the blow water supply means 5 to the air diffuser plate 4. can do. In addition, although there is no restriction | limiting in particular in the supply frequency of blow water, Preferably blow water is supplied in the air supply piping 3 for aeration every several hours to several days.

以上のように、本実施の形態の散気装置１は内挿管７を備えており、水を満管にしなくてもブロー水を散気板４に供給することができるので、空気の供給通路は常に確保されている。従って、空気の供給中に定期的にブロー水を供給し、散気板４の散気孔に付着した微生物をブロー水で除去しながら、散気装置１を連続運転することができる。
また、本実施の形態においては、散気板に形成する微細孔を矩形状のスリットにし、その短辺の長さを０．０３ｍｍ〜０．１５ｍｍに設定したので、水ブローによる散気板の目詰まり防止効果が高く、かつ高い酸素移動効率を実現できる。 As described above, the air diffuser 1 according to the present embodiment includes the inner tube 7 and can supply blow water to the air diffuser plate 4 without filling the water, so that an air supply passage is provided. Is always secured. Accordingly, it is possible to continuously operate the air diffuser 1 while supplying blow water periodically during the air supply and removing the microorganisms adhering to the air diffuser holes of the air diffuser plate 4 with the blow water.
Moreover, in this Embodiment, since the micropore formed in a diffuser board was made into the rectangular-shaped slit, and the length of the short side was set to 0.03 mm-0.15 mm, the diffuser board of a water blow is used. High clogging prevention effect and high oxygen transfer efficiency.

なお、上記の実施の形態においては、ブロー水について特に限定していないが、微生物を死滅させる効果を有する成分を含むブロー水を使用することによって、微生物の増殖を効果的に抑制することができる。微生物を死滅させる効果を有する成分には、特に制限はないが、例えば、抗菌物質または酸化物質、より具体的には、次亜塩素酸ナトリウム、逆性石鹸、酸、アルカリ、オゾン、または二酸化塩素、炭酸アルカリ金属などが含まれる。   In the above embodiment, the blow water is not particularly limited. However, the use of blow water containing a component having an effect of killing microorganisms can effectively suppress the growth of microorganisms. . The component having an effect of killing microorganisms is not particularly limited, but for example, an antibacterial substance or an oxidizing substance, more specifically, sodium hypochlorite, inverse soap, acid, alkali, ozone, or chlorine dioxide And alkali metal carbonates.

まず、内挿管７による水ブローの効果を検証するために、スリットの短辺が比較的短い（幅の狭い）散気板を曝気槽に設置し、下記の条件にて水ブローを実施した。   First, in order to verify the effect of water blow by the intubation tube 7, a diffuser plate with a relatively short short side (narrow width) was installed in the aeration tank, and water was blown under the following conditions.

散気板材質:SUS316L
孔形状 : 長さ1.45mm、短辺（幅）0.04mm
開孔率 : 約0.5%
通気量 : 30m3/m2/hr
ブロー水 : 次亜塩素酸ナトリウム溶液(濃度;100ppm)
ブロー水量 : 500ml/回
水ブロー頻度: 1回/日
なお、水ブローを実施しない例を比較例とした。 Air diffuser material: SUS316L
Hole shape: length 1.45mm, short side (width) 0.04mm
Opening ratio: about 0.5%
Ventilation rate: 30m3 / m2 / hr
Blow water: Sodium hypochlorite solution (concentration: 100 ppm)
Blow water volume: 500 ml / time Water blow frequency: 1 time / day An example in which no water blow was performed was used as a comparative example.

水ブロー有りの例(実施例)となしの例(比較例)の圧損増加量（mmAq）の経時変化を、図８のグラフに示した。   The graph of FIG. 8 shows the change over time in the amount of increase in pressure loss (mmAq) in the example (Example) with and without water blow (Comparative Example).

図８のグラフから明らかなように、水ブローを定期的に実施することによって、長期間にわたる散気運転においても散気装置の圧損上昇を効果的に抑制することができ、高い酸素移動効率を維持することができた。   As is clear from the graph of FIG. 8, by periodically carrying out the water blow, it is possible to effectively suppress an increase in the pressure loss of the air diffuser even in the air diffused operation over a long period of time, and to achieve a high oxygen transfer efficiency. Could be maintained.

次に、スリット短辺長さの変化の影響を確認するため、スリットの短辺の長さの異なる散気板を曝気槽に設置して下記の条件にて連続曝気運転を実施した。
散気板材質 : SUS316L
スリット長辺の長さ : 0.5mm
通気量 : 30m3/m2/hr
ブロー水 : 次亜塩素酸ナトリウム溶液(濃度;20ppm)
ブロー水量 : 500ml/回
水ブロー頻度 : 2回/日 Next, in order to confirm the influence of the change in the short side length of the slit, an aeration plate having a different length of the short side of the slit was installed in the aeration tank, and a continuous aeration operation was performed under the following conditions.
Air diffuser plate material: SUS316L
Long slit length: 0.5mm
Ventilation rate: 30m 3 / m 2 / hr
Blow water: Sodium hypochlorite solution (concentration: 20 ppm)
Blow water volume: 500ml / time Water blow frequency: 2 times / day

使用した散気板の酸素移動効率（曝気開始初期）と曝気開始１００日後の圧損上昇量を表１に示す。

Figure 2009172580
Table 1 shows the oxygen transfer efficiency (initial stage of aeration) and the amount of pressure loss increase 100 days after the start of aeration.
Figure 2009172580

表１から分かるように、スリット短辺を０．１５ｍｍ以下にすれば２５％以上の高い酸素移動効率が得られる。他方、スリット短辺が長いほど水ブローによる閉塞物質の除去がされ易く、１００日後の圧損上昇量は低くなり、スリット短辺を０．０３ｍｍ以上にすると１００日後の圧損上昇量が１００ｍｍＡｑ以下となる。
このことから、スリット短辺の長さを０．０３ｍｍ〜０．１５ｍｍの範囲に設定すれば、２５％以上の高い酸素移動効率が得られと共に水ブローによる閉塞物質の除去が効果的に行なえることが確認された。
また、スリット短辺の長さを０．０８ｍｍ〜０．１２ｍｍの範囲に設定すれば３０％以上の極めて高い酸素移動効率が得られるとともに、１００日後の圧損上昇量が７０ｍｍＡｑ以下となって水ブローによる閉塞物質の除去がさらに効果的に行うことができ、好ましい。 As can be seen from Table 1, when the slit short side is 0.15 mm or less, a high oxygen transfer efficiency of 25% or more can be obtained. On the other hand, the longer the slit short side is, the easier it is to remove clogging substances by water blowing, and the amount of increase in pressure loss after 100 days becomes lower. When the slit short side is 0.03 mm or more, the amount of pressure loss increase after 100 days becomes 100 mmAq or less. .
From this, if the length of the short side of the slit is set in the range of 0.03 mm to 0.15 mm, a high oxygen transfer efficiency of 25% or more can be obtained and the removal of the blocking substance by water blow can be effectively performed. It was confirmed.
In addition, if the length of the short side of the slit is set in the range of 0.08 mm to 0.12 mm, an extremely high oxygen transfer efficiency of 30% or more can be obtained, and the pressure loss increase after 100 days is 70 mmAq or less. The removal of the occlusive substance by the can be performed more effectively, which is preferable.

本発明の一実施の形態に係る散気装置の模式図である。It is a mimetic diagram of an air diffuser concerning one embodiment of the present invention. 本発明の一実施の形態に係る散気板の平面図である。It is a top view of the diffuser plate which concerns on one embodiment of this invention. 図２の一部を拡大して示す拡大図である。It is an enlarged view which expands and shows a part of FIG. 本発明の一実施の形態に係る内挿管の断面図である。It is sectional drawing of the intubation which concerns on one embodiment of this invention. 本発明の一実施の形態に係る内挿管の一態様を示す図であり、吸込み面が傾斜していない場合の模式図である。It is a figure which shows the one aspect | mode of the intubation tube which concerns on one embodiment of this invention, and is a schematic diagram in case the suction surface is not inclined. 本発明の一実施の形態に係る内挿管の他の態様を示す図であり、吸込み面が傾斜している場合の模式図である。It is a figure which shows the other aspect of the intubation tube which concerns on one embodiment of this invention, and is a schematic diagram in case the suction surface inclines. 本発明の一実施の形態における内挿管の説明図であり、内挿管に設けた通気孔の効果を示す模式図である。It is explanatory drawing of the intubation in one embodiment of this invention, and is a schematic diagram which shows the effect of the vent provided in the intubation. 実施例の圧損増加量の経時変化を示すグラフである。It is a graph which shows a time-dependent change of the pressure loss increase amount of an Example.

符号の説明Explanation of symbols

１ 散気装置
２ ガス供給手段
３ 散気用給気配管
４ 散気板
４ａ スリット
５ ブロー水供給手段
７ 内挿管
７ａ 弁座
８ 吸い込み面
９ 通気孔
１０ 固定用締付け部材
１１ 取付ブラケット
１２ 曝気槽
１４ ブロー水供給管
１５、１６ 開閉弁
θ 傾斜角度 DESCRIPTION OF SYMBOLS 1 Air diffuser 2 Gas supply means 3 Air supply piping for aeration 4 Air diffuser plate 4a Slit 5 Blow water supply means 7 Inner intubation 7a Valve seat 8 Suction surface 9 Vent hole 10 Fixing member 11 Mounting bracket 12 Aeration tank 14 Blow water supply pipe 15, 16 On-off valve θ Inclination angle

Claims (2)

曝気槽内に配置されて散気用給気配管から圧力空気の供給を受けてスリットから気泡を放出する散気板と、前記散気用給気配管内へブロー水を供給するブロー水供給手段と、上端が前記散気板側に連通され、下端が前記散気用給気配管内に内挿されて前記散気用給気配管内に供給されたブロー水を前記散気板から排出する内挿管とを備え、前記散気板に形成されたスリットは矩形状からなり、短辺の長さが０．０３ｍｍ〜０．１５ｍｍに設定されていることを特徴とする散気装置。 A diffuser plate that is disposed in the aeration tank and receives supply of pressurized air from the air supply pipe for air diffusion and discharges air bubbles from the slit; and blow water supply means for supplying blow water into the air supply pipe for air diffusion An inner tube in which the upper end is communicated with the diffuser plate side, the lower end is inserted into the diffuser air supply pipe, and blow water supplied into the diffuser air supply pipe is discharged from the diffuser plate; And the slit formed in the diffuser plate has a rectangular shape, and the length of the short side is set to 0.03 mm to 0.15 mm. スリットの長辺の長さが０．１ｍｍ〜１．５ｍｍに設定されていることを特徴とする請求項１に記載の散気装置。 The length of the long side of a slit is set to 0.1 mm-1.5 mm, The aeration apparatus of Claim 1 characterized by the above-mentioned.
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