JP5928710B2 - Aeration equipment - Google Patents
Aeration equipment Download PDFInfo
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- JP5928710B2 JP5928710B2 JP2012108148A JP2012108148A JP5928710B2 JP 5928710 B2 JP5928710 B2 JP 5928710B2 JP 2012108148 A JP2012108148 A JP 2012108148A JP 2012108148 A JP2012108148 A JP 2012108148A JP 5928710 B2 JP5928710 B2 JP 5928710B2
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- aeration
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- air
- bubbles
- aeration tank
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- 238000005273 aeration Methods 0.000 title claims description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004581 coalescence Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
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Classifications
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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
Landscapes
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Description
本発明は、生物学的廃水処理設備などで用いられる曝気装置に関するものである。 The present invention relates to an aeration apparatus used in a biological wastewater treatment facility or the like.
下水処理や産業廃水処理などでは、活性汚泥法等の生物学的処理方法が広く利用されている。この生物学的処理方法は、嫌気的条件下で行う方法と好気的条件下で行う方法がある。そして、好気的条件下で行う場合の曝気装置には、曝気槽と呼ばれる水槽の底部に設けられる散気装置に空気を送り込み、微細気泡化して水槽内に放出する酸素供給手段が多用されている。 Biological treatment methods such as the activated sludge method are widely used in sewage treatment and industrial wastewater treatment. This biological treatment method includes a method performed under anaerobic conditions and a method performed under aerobic conditions. The aeration apparatus used in an aerobic condition often uses oxygen supply means for sending air into a diffuser provided at the bottom of a water tank called an aeration tank, forming fine bubbles and releasing it into the water tank. Yes.
この曝気装置の省エネルギー化については、種々の改良が行われている。例えば、特許文献１には、曝気槽内に超音波発生装置を投入し、散気装置から発生した気泡の合一により粗大化した気泡を効率的に微細化して、より高い酸素溶解効率を得ることにより、消費電力を低減させた廃水処理装置が開示されている。 Various improvements have been made for energy saving of the aeration apparatus. For example, in Patent Document 1, an ultrasonic generator is placed in an aeration tank, and bubbles that are coarsened by coalescence of bubbles generated from the diffuser are efficiently refined to obtain higher oxygen dissolution efficiency. Thus, a wastewater treatment apparatus with reduced power consumption is disclosed.
一般に曝気槽は水深が５ｍ程度であり、その底部に微細気泡を発泡する散気装置を設置して、そこに送風機から配管を介して空気を圧送し、槽内に微細気泡を発生させている。 Generally, the aeration tank has a water depth of about 5 m, and a diffuser for foaming fine bubbles is installed at the bottom of the aeration tank, and air is pumped from the blower through a pipe to generate fine bubbles in the tank. .
ところで、送風機の必要動力は、風量と圧力に比例する。この送風機に必要な圧力は通常６０〜７０ｋＰａ程度であるが、そのほとんどは通常５ｍ程度の散気水深に対応した水圧によるものであり、これが使用動力の大きな要因になっている。 By the way, the required power of the blower is proportional to the air volume and pressure. The pressure required for the blower is usually about 60 to 70 kPa, but most of the pressure is usually due to the water pressure corresponding to the diffused water depth of about 5 m, which is a major factor in the power used.
一般に、散気装置の設置水深が５ｍ程度であるのは、酸素溶解効率が散気水深の約０．７乗に比例して増加するため、その点では散気水深は深い程よいが、一方、窒素の過飽和を招かないレベルを考慮すると、適切な水深が５ｍ程度であるからである。 In general, the installation depth of the diffuser is about 5 m because the oxygen dissolution efficiency increases in proportion to about 0.7th power of the diffused water depth. This is because the appropriate water depth is about 5 m in consideration of a level that does not cause nitrogen supersaturation.
本発明の目的は、少ない動力で高い酸素溶解効率が得られる曝気装置を提供することにある。 An object of the present invention is to provide an aeration apparatus capable of obtaining high oxygen dissolution efficiency with less power.
本発明は、上記課題を解決するべくなされたものであり、曝気槽の水深の中間部に散気装置を設置するとともにその上方に下降流発生手段を設けて散気装置から発生した気泡を槽底部まで送り込むことによってかかる目的を達成したものである。 The present invention has been made to solve the above-mentioned problems, and an air diffuser is installed in the middle of the water depth of the aeration tank, and a downward flow generating means is provided above the air diffuser so that bubbles generated from the air diffuser are stored in the tank. This is achieved by feeding to the bottom.
すなわち、本発明は、
曝気槽と、該曝気槽内の水面下２〜３ｍの位置に配置され、散気用給気配管から圧力空気の供給を受けて気泡を放出する散気装置と、前記散気装置の上方に設置され、該曝気槽の下部に前記気泡を搬送する下降流発生手段とを備えたことを特徴とする曝気装置と、
前記下降流発生手段は、プロペラ式攪拌機であることを特徴とする上記の曝気装置
を提供するものである。
That is, the present invention
An aeration tank, an aeration apparatus disposed at a position 2 to 3 m below the surface of the water in the aeration tank, receiving a supply of pressurized air from the aeration air supply pipe and releasing bubbles, and above the aeration apparatus An aeration apparatus, comprising: a downflow generating means that is installed and conveys the bubbles to a lower portion of the aeration tank;
The downflow generation means is a propeller type agitator, and provides the aeration apparatus described above.
本発明により、曝気槽の運転コストの大きな部分を占めている送風機動力を大きく節減できる。例えば、散気装置設置水深を５ｍから２．５ｍにすれば、送風機の必要圧力は６５ｋＰａから４０ｋＰａに減少し、送風機動力を約４０％削減できる。なお、下降流を発生させる攪拌装置の動力は送風機動力（例えば約５０ｋｗ）の１／１０以下であり、攪拌装置の動力による増加分は送風機動力の１０％以下にすぎない。 According to the present invention, it is possible to greatly reduce the power of the blower that occupies a large portion of the operating cost of the aeration tank. For example, if the diffuser installation water depth is changed from 5 m to 2.5 m, the required pressure of the blower is reduced from 65 kPa to 40 kPa, and the blower power can be reduced by about 40%. The power of the stirring device that generates the downward flow is 1/10 or less of the power of the blower (for example, about 50 kw), and the increase due to the power of the stirring device is only 10% or less of the power of the blower.
本発明の曝気装置は曝気槽と散気装置と下降流発生手段よりなる。 The aeration apparatus of the present invention comprises an aeration tank, an air diffuser, and a downward flow generating means.
曝気槽は、被処理水を収容して生物学的処理を行う槽であり、形状は特に限定されないが、通常は箱形あるいは円筒形である。サイズは被処理水の量等によって変わるが、箱形の場合、縦×横が４〜１００ｍ×４〜１２ｍ程度、円筒形の場合半径が２〜２０ｍ程度である。深さは浅いものから１００ｍに及ぶものなどがあるが、深いものは、全体の攪拌等に特別な設備が必要であり、通常は４〜１２ｍ程度である。 The aeration tank is a tank that stores the water to be treated and performs biological treatment, and the shape is not particularly limited, but is usually a box shape or a cylindrical shape. The size varies depending on the amount of water to be treated, but in the case of a box shape, the length × width is about 4 to 100 m × 4 to 12 m, and in the case of a cylinder, the radius is about 2 to 20 m. Although the depth ranges from shallow to 100 m, the deep depth requires special equipment for the entire stirring and the like, and is usually about 4 to 12 m.
散気装置は、散気用給気配管から圧力空気の供給を受けて気泡を曝気槽内に放出する装置であり、該曝気槽内の水面下２〜３ｍの位置に配置される。気泡は微細気泡とするのがよく、径は１〜３ｍｍ程度、好ましくは１ｍｍ程度とするのがよい。散気装置の散気部は孔タイプ、ノズルタイプ等があるがいずれでもよい。散気装置を水面下２〜３ｍとしたのは、１．５ｍ程度では下降流発生手段で気泡を槽底まで送ることが難しくなり、一方、３．５ｍ程度になると、送風機の必要圧力が増して動力削減があまりできなくなるからである。この水面は定常運転時のものである。散気装置に送る送風機の必要圧力は、散気装置の散気部の水深に加えて、散気装置及び送気配管の圧力損失分等として、５〜２０ｋＰａ程度を見込めばよい。曝気槽には種々の目的でその他の空気（酸素）供給機構を設けることができるが、その場合もこの散気装置は曝気槽における主たる散気装置である。 The air diffuser is a device that receives supply of pressurized air from the air supply pipe for air diffusion and releases bubbles into the aeration tank, and is disposed at a position 2 to 3 m below the water surface in the aeration tank. The bubbles are preferably fine bubbles, and the diameter is about 1 to 3 mm, preferably about 1 mm. The air diffuser of the air diffuser has a hole type, a nozzle type, etc., but any of them may be used. The reason why the air diffuser is set to 2 to 3 m below the surface of the water is that if it is about 1.5 m, it will be difficult to send the bubbles to the bottom of the tank by the downward flow generating means, while if it is about 3.5 m, the required pressure of the blower will increase. This is because power reduction is not possible. This water surface is during steady operation. The required pressure of the blower to be sent to the air diffuser may be expected to be about 5 to 20 kPa as the pressure loss of the air diffuser and the air supply pipe in addition to the water depth of the air diffuser of the air diffuser. The aeration tank may be provided with other air (oxygen) supply mechanisms for various purposes. In this case, the aeration apparatus is the main aeration apparatus in the aeration tank.
下降流発生手段は、散気装置から放出された気泡を曝気槽の槽底近傍まで、好ましくは槽底まで送る手段であり、プロペラ式攪拌機、噴流装置、ポンプ方式などを用いることができる。この下降流発生手段は、気泡を槽底に向けて送る手段であり、そのため、散気装置の上方好ましくは真上に設置される。散気装置の散気部との間隔は垂直距離で５０〜２５０ｃｍ程度が適当である。この下降流を生じる結果、曝気槽内では循環流が形成される。 The downward flow generating means is means for sending the bubbles released from the diffuser to the vicinity of the bottom of the aeration tank, preferably to the bottom of the aeration tank, and a propeller-type stirrer, a jet apparatus, a pump system, or the like can be used. This downward flow generating means is means for sending bubbles toward the bottom of the tank, and is therefore installed above and preferably directly above the air diffuser. The distance between the air diffuser of the air diffuser and the vertical distance is suitably about 50 to 250 cm. As a result of this downward flow, a circulating flow is formed in the aeration tank.
曝気槽内に設置される散気装置と下降流発生手段は一基に限らず複数基設けることもできる。 The diffuser installed in the aeration tank and the downflow generating means are not limited to one, and a plurality of units can be provided.
本発明の一実施態様である曝気装置の概略構造を図１に示す。箱形の曝気槽の水深の中間部やや下に散気装置が設けられ、そこには送風機（Ｂ）から圧力空気が送られている。散気装置の真上にはモータ（Ｍ）によって回転するプロペラ式攪拌機が取付けられ、散気装置から放出される気泡がこの攪拌機によって生じる下降流によって槽底まで送られる。 A schematic structure of an aeration apparatus according to an embodiment of the present invention is shown in FIG. An air diffuser is provided slightly below the middle of the water depth of the box-shaped aeration tank, and pressurized air is sent from the blower (B). A propeller-type stirrer that is rotated by a motor (M) is attached directly above the air diffuser, and bubbles released from the air diffuser are sent to the bottom of the tank by a downward flow generated by the stirrer.
散気装置と攪拌機を槽内に複数設置した例を図２に示す。 An example in which a plurality of aeration devices and agitators are installed in the tank is shown in FIG.
図３は、従来の曝気装置の例であり、槽底近傍に設置された散気装置から気泡が放出されている。 FIG. 3 shows an example of a conventional aeration apparatus, in which bubbles are released from an aeration apparatus installed in the vicinity of the tank bottom.
本発明により、曝気槽の運転コストの大きな割合を占めている散気装置へ送る送風機の動力を大幅に削減できる。各種の曝気装置に広く利用可能である。 By this invention, the motive power of the air blower sent to the diffuser which occupies the big ratio of the operating cost of an aeration tank can be reduced significantly. It can be widely used for various aeration devices.
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| JP2012108148A JP5928710B2 (en) | 2012-05-10 | 2012-05-10 | Aeration equipment |
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| JP2012108148A JP5928710B2 (en) | 2012-05-10 | 2012-05-10 | Aeration equipment |
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| JP5928710B2 true JP5928710B2 (en) | 2016-06-01 |
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Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3643403A (en) * | 1970-04-29 | 1972-02-22 | Richard E Speece | Downflow bubble contact aeration apparatus and method |
| US4246111A (en) * | 1979-11-07 | 1981-01-20 | Canadian Liquid Air Ltd/Air Liquide Canada Ltee | Apparatus for biological treatment of waste water |
| SE9103377L (en) * | 1991-11-14 | 1993-05-15 | Lars Ljungkvist | PROCEDURE FOR PIPING AND TREATMENT OF LIQUID BY AIR APPROPRIATE DEVICE FOR PERFORMANCE OF THE PROCEDURE |
| JP3160057B2 (en) * | 1992-03-09 | 2001-04-23 | 三井鉱山株式会社 | Stirring aeration device |
| JP3239171B2 (en) * | 1994-07-25 | 2001-12-17 | アタカ工業株式会社 | Axial impeller in a stirred aerator |
| JP2000317488A (en) * | 1999-05-14 | 2000-11-21 | Ishigaki Co Ltd | Device for underwater aeration and agitation |
| TW439554U (en) * | 1999-06-17 | 2001-06-07 | Huang Shen Jan | Sunken type high oxygen-content aeration stirring device |
| JP3649080B2 (en) * | 2000-04-03 | 2005-05-18 | 株式会社石垣 | Underwater aeration stirrer |
| JP3775974B2 (en) * | 2000-07-10 | 2006-05-17 | 日立機電工業株式会社 | Aerator |
| JP2003211180A (en) * | 2002-01-18 | 2003-07-29 | Takashi Kinoshita | Underwater fine air bubble generator |
| JP3831942B2 (en) * | 2002-03-01 | 2006-10-11 | 栗田工業株式会社 | Membrane separator |
| JP5188997B2 (en) * | 2009-01-20 | 2013-04-24 | 株式会社日立プラントテクノロジー | Aeration stirrer |
| JP5728218B2 (en) * | 2010-12-15 | 2015-06-03 | メタウォーター株式会社 | Aeration stirrer |
| JP4875777B1 (en) * | 2011-05-19 | 2012-02-15 | アタカ大機株式会社 | Aeration stirrer |
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