JPH0760283A - Aeration apparatus in aeration tank with high depth of water - Google Patents
Aeration apparatus in aeration tank with high depth of waterInfo
- Publication number
- JPH0760283A JPH0760283A JP5238937A JP23893793A JPH0760283A JP H0760283 A JPH0760283 A JP H0760283A JP 5238937 A JP5238937 A JP 5238937A JP 23893793 A JP23893793 A JP 23893793A JP H0760283 A JPH0760283 A JP H0760283A
- Authority
- JP
- Japan
- Prior art keywords
- draft tube
- tube
- bubbles
- tank
- aeration tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は高水深曝気槽においても
効率的な撹拌運転が行えるようにした曝気装置に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aeration apparatus capable of performing efficient stirring operation even in a deep water aeration tank.
【０００２】[0002]
【従来の技術】高水深曝気槽において水面上もしくは水
面近くにスクリュー式曝気機をその撹拌流が下向きとな
るように設置し、水面近くの水を撹拌曝気し、その下向
流にて槽底まで撹拌するようになしている。またこの曝
気機により発生する下向流が槽底に達しやすいように槽
内にほぼ垂直にしてスクリュー先端位置に配設してい
る。2. Description of the Related Art In a deep water aeration tank, a screw type aerator is installed above or near the water surface so that the agitated flow of the agitator faces downward, agitates and aerates the water near the water surface, and the downflow causes the tank bottom Stir until. Further, in order to facilitate the downward flow generated by this aerator to reach the bottom of the tank, it is arranged almost vertically in the tank at the screw tip position.
【０００３】[0003]
【発明が解決しようとする課題】しかし高水深曝気槽に
おいて効率的に撹拌曝気を行う際、障害となるのは気泡
の浮力である。この気泡の浮力はその大きさが一定限度
以下の場合、殆ど無視することができるが、下向水流中
の微細気泡が互いに合体して大きな気泡に成長すると、
その気泡の浮力は撹拌力を低下させるものとなる。特に
スクリュー式曝気機を鉛直下方向きに設置し、かつこの
スクリュー下端方にドラフトチューブを設置する場合、
微細気泡となってドラフトチューブ内を流下する際、気
泡同士が合体して大きな気泡になるとその上方向からの
スクリューによる下向流と、気泡の浮力とが互いに打ち
消し合って合体した気泡は行き場をなくし、さらに微細
気泡は順次スクリューの回動にて供給されるので、ドラ
フトチューブ内にやがて空隙が生じ、下向流に逆らって
上昇し始める。従ってこの気泡浮上により生じる上向流
がドラフトチューブ内で発生すると、この上向流はスク
リューの発生する撹拌流に対しカウンターフローとな
り、著しく撹拌を阻害するものとなる。これを未然に防
ぐためには、従来は気泡量に対し撹拌流速を増加させ、
合体した気泡による空隙が発生する前にドラフトチュー
ブ下端より速やかに排出させている。これによって動力
投入密度が大きくなり、非効率的である。However, it is the buoyancy of bubbles that becomes a hindrance when efficiently performing stirring aeration in a deep water aeration tank. The buoyancy of the bubbles can be almost ignored when the size is below a certain limit, but when the fine bubbles in the downward water flow combine with each other to grow into large bubbles,
The buoyancy of the bubbles reduces the stirring force. Especially when installing the screw type aerator vertically downward, and when installing the draft tube at the lower end of this screw,
When air bubbles become fine bubbles and flow down in the draft tube, when the bubbles coalesce into large bubbles, the downward flow due to the screw from above and the buoyancy of the bubbles cancel each other out, and the coalesced bubbles go out. Further, since the fine bubbles are sequentially supplied by the rotation of the screw, a void is created in the draft tube, and the bubbles start to rise against the downward flow. Therefore, when the upward flow generated by the floating of the bubbles is generated in the draft tube, the upward flow serves as a counter flow for the stirring flow generated by the screw, and significantly disturbs the stirring. In order to prevent this, in the past, the stirring flow rate was increased with respect to the amount of bubbles,
The air is discharged quickly from the lower end of the draft tube before the voids are formed by the combined bubbles. This increases the power input density and is inefficient.
【０００４】本発明はドラフトチューブ内で発生する合
体した気泡をドラフトチューブ内で空隙となる前にドラ
フトチューブ外へ排出し、かつこれを曝気槽内における
撹拌力として利用することを目的とする。An object of the present invention is to discharge the coalesced bubbles generated in the draft tube to the outside of the draft tube before forming voids in the draft tube, and utilize this as a stirring force in the aeration tank.
【０００５】[0005]
【課題を解決するための手段】本発明は上記目的を達成
するためになしたもので、曝気槽内に鉛直方向に、しか
も槽底に達する縦方向の循環水流が発生しやすいように
して設けたドラフトチューブ内に気液分離管を配設する
とともにこの気液分離管の上方にスクリュー式曝気機を
配設し、かつ気液分離管より合体した気泡をドラフトチ
ューブ外へ導き放出するための気泡排出管を突設して成
ることを要旨とする。The present invention has been made to achieve the above object, and is provided in the aeration tank in such a manner that a circulating water flow in the vertical direction and in the vertical direction reaching the bottom of the aeration tank is easily generated. A gas-liquid separation tube is installed in the draft tube and a screw type aerator is installed above the gas-liquid separation tube, and the combined air bubbles from the gas-liquid separation tube are guided to the outside of the draft tube and discharged. The gist is that it is formed by projecting a bubble discharge pipe.
【０００６】[0006]
【作用】曝気機の運転初期においては慣性による対流が
なくスクリュー下流に気泡塊が生じやすいが、このスク
リュー下流に砲弾形をした気液分離管を設け、しかも曝
気量を調整すると気泡は気液分離管外周面を流下し、そ
の下方へ合体した気泡は浮力にて上昇すると開口された
気液分離管内へ導かれる。そして気泡排出管を経てドラ
フトチューブ外へ排出されるので、この放出気泡の浮力
にてドラフトチューブ外では上向流を発生させる。これ
によりドラフトチューブ内外にて槽底に達する循環水流
が発生し、ドラフトチューブ内では微細気泡を含む下向
流は合体した気泡塊に邪魔されることがなく槽底に達
し、これにより安定した撹拌流にて高水深曝気槽におい
ても効率的に曝気が行える。[Function] In the initial stage of operation of the aerator, there is no convection due to inertia, and bubble lumps are likely to occur downstream of the screw. The bubbles flowing down the outer peripheral surface of the separation tube and coalesced below the separation tube are guided to the opened gas-liquid separation tube by buoyancy. Then, since it is discharged to the outside of the draft tube through the bubble discharge pipe, the buoyancy of the discharged bubbles causes an upward flow outside the draft tube. As a result, a circulating water flow that reaches the tank bottom inside and outside the draft tube is generated, and in the draft tube, the downward flow containing fine bubbles reaches the tank bottom without being disturbed by the coalesced bubble lumps, which results in stable stirring. Aeration can be performed efficiently even in a deep water aeration tank.
【０００７】[0007]
【実施例】以下本発明高水深曝気槽における曝気装置を
図示の実施例にもとづいて説明する。図において１は所
要の深度と容積を有する高水深曝気槽で、この曝気槽１
の水面位置もしくは水面上部にスクリュー式曝気機２を
鉛直下方向に配設し、かつスクリュー２１は水面下所要
位置になるようにするとともにスクリューにて発生する
下向流が槽底まで導かれるようにスクリュー下端下方に
スクリューの下向流にそってドラフトチューブ３を配設
する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An aeration device for a deep water aeration tank of the present invention will be described below with reference to the illustrated embodiments. In the figure, 1 is a high water depth aeration tank having a required depth and volume.
The screw type aerator 2 is arranged vertically downward at the water surface position or above the water surface, and the screw 21 is set to the required position below the water surface so that the downward flow generated by the screw is guided to the bottom of the tank. The draft tube 3 is arranged below the lower end of the screw along the downward flow of the screw.
【０００８】このドラフトチューブ３はその外周に複数
の支持ブラケット４，４・・・を突設して曝気槽１に支
持するとともにさらにこのドラフトチューブ３内にはス
クリューにより発生する下向流の抵抗を可及的に小さく
成るようにほぼ砲弾形をした気液分離管５を配設する
が、この気液分離管５の上端とスクリュー下端とを互い
に対向させ、かつ長手軸心を同一鉛直線上に配設するも
のである。This draft tube 3 has a plurality of support brackets 4, 4 ... Protrudingly provided on its outer periphery to support the aeration tank 1, and the draft tube 3 further has a downward flow resistance generated by a screw. A gas-liquid separation tube 5 having a substantially bullet shape is arranged so that the diameter of the gas-liquid separation tube 5 is as small as possible. Is to be installed in.
【０００９】またこの気液分離管５はドラフトチューブ
３よりも短くし、かつ該管の中央または下部外周位置に
斜上方で放射方向に突出する１または２以上の気泡排出
管６，６をドラフトチューブ３を貫通して設け、この気
泡排出管６の先端を上方を向くようにしてノズル６Ｎと
する。The gas-liquid separating pipe 5 is shorter than the draft tube 3, and one or more bubble discharging pipes 6, 6 which radially project obliquely upward to the central or lower peripheral position of the pipe are drafted. The nozzle 6N is provided by penetrating the tube 3 and making the tip of the bubble discharge pipe 6 face upward.
【００１０】従って上述の如く構成する装置においてス
クリュー式曝気機２を運転すると、その運転開始初期に
は慣性による対流がなく、スクリュー下方流域に気泡塊
が生じやすい。これはスクリューの回動にて微細気泡が
撹拌流内に混合され、その下向流に乗って鉛直方向へ流
下する。この時砲弾形をした気液分離管の外周面にそっ
て流下する。そして流下中に微細気泡は互いに合体し、
大きな気泡となって浮力が増し、これがスクリューによ
る下向流に打ち勝つと上昇する。この上昇気泡は下端が
開口された気液分離管内へ導かれ、該分離管内に充満す
ると気泡排出管６を経てドラフトチューブ外へ排気され
る。この運転初期においては曝気機の通気量を調整し、
合体気泡が分離管内へ導き充満しやすいようになす。Therefore, when the screw type aerator 2 is operated in the apparatus constructed as described above, there is no convection due to inertia at the beginning of the operation, and bubble lumps are likely to occur in the screw lower flow region. This is because the fine air bubbles are mixed in the stirring flow by the rotation of the screw, and the downward flow is carried down and flows down in the vertical direction. At this time, it flows down along the outer peripheral surface of the shell-shaped gas-liquid separation tube. And during the flow down the fine bubbles coalesce with each other,
It becomes a large bubble and buoyancy increases, and it rises when it overcomes the downward flow by the screw. The ascending bubbles are guided into a gas-liquid separation pipe having an opening at the lower end, and when they fill the separation pipe, they are discharged to the outside of the draft tube through the bubble discharge pipe 6. At the beginning of this operation, adjust the aeration volume of the aerator,
The coalescing bubbles are guided into the separation tube so that they can be easily filled.
【００１１】気泡排出管６よりドラフトチューブ外へ排
出された気泡はその浮力によりドラフトチューブに上方
に向かって上昇する際、ドラフトチューブの外側に上向
流を発生させる。この上向流とドラフトチューブ内にス
クリューにて発生する下向流との相乗作用により、高水
深曝気槽内にドラフトチューブ内を流下し、この内側下
端よりドラフトチューブの外周側を上昇する循環水流が
発生する。When the bubbles discharged from the bubble discharge pipe 6 to the outside of the draft tube rise upward in the draft tube due to the buoyancy, they generate an upward flow outside the draft tube. Due to the synergistic effect of this upward flow and the downward flow generated by the screw in the draft tube, the circulating water flow that flows down the draft tube into the deep water aeration tank and rises from the inner lower end to the outer peripheral side of the draft tube. Occurs.
【００１２】このように曝気槽内でドラフトチューブの
内外周面を循環する水流が発生し、かつ合体気泡がドラ
フトチューブ外へ排出されると、特にドラフトチューブ
内の下向流は気泡塊の浮力に邪魔されることなく曝気槽
の底部にまで達し、安定した撹拌流により深槽曝気槽に
おいても効率的に曝気を行うことができる。In this way, when the water flow circulating inside and outside the draft tube in the aeration tank is generated and the coalesced bubbles are discharged to the outside of the draft tube, the downward flow in the draft tube in particular causes the buoyancy of the bubble mass. Can reach the bottom of the aeration tank without being disturbed by the aeration, and a stable agitating flow enables efficient aeration even in the deep aeration tank.
【００１３】なお図２では曝気機を運転した初期の状態
を示し、槽内の循環水流も未だ不安定なので微細気泡は
槽底には達していないが、運転開始からしばらくすると
図３に示すように槽内全体に、特にドラフトチューブ内
外周の安定した循環水流が発生して微細気泡も槽底に達
し、かつ気泡塊による撹拌力も作用している状態を示
す。Note that FIG. 2 shows the initial state of operation of the aerator, and since the circulating water flow in the tank is still unstable, fine bubbles have not reached the bottom of the tank, but after a while from the start of operation, as shown in FIG. In particular, a state in which a stable circulating water flow is generated in the entire tank, especially in the inner and outer peripheries of the draft tube, fine bubbles reach the bottom of the tank, and the stirring force by the bubble lumps also acts.
【００１４】図５に示すものは図１の実施例の平面図
で、気液分離管からドラフトチューブを貫通した気泡排
出管が放射方向の４箇所に突設したものであるが、この
数は限定されることはなく、槽の平面積や容積その他の
条件により適宣定められるものとする。FIG. 5 is a plan view of the embodiment shown in FIG. 1, in which bubble discharge pipes penetrating the draft tube from the gas-liquid separation pipe are provided at four radial positions, the number of which is the same. There is no limitation, and it shall be properly determined depending on the flat area, volume, and other conditions of the tank.
【００１５】また図６に示す実施例はドラフトチューブ
の代わりに槽内中央に縦方向に仕切板７を設け、槽内に
縦方向の循環水流を形成し、その一方に曝気機及び気液
分離管を設置し、気泡排出管の先端が仕切板を貫通して
曝気機の設置されていない側の室へ導くようにしたもの
で、第１実施例と同様の作用効果を有する。In the embodiment shown in FIG. 6, a partition plate 7 is provided in the center of the tank in the vertical direction instead of the draft tube, and a circulating water flow in the vertical direction is formed in the tank. A pipe is installed so that the tip of the bubble discharge pipe penetrates through the partition plate and is guided to the chamber on the side where the aerator is not installed, and has the same effect as the first embodiment.
【００１６】さらに図７に示す実施例は気液分離管を省
き、ドラフトチューブの形状を上半を細径に、下半を太
径として、この太径と細径の連設部に気泡溜室Ｒを設
け、この室より気泡排出管を突設したもので、第１実施
例と同様の作用効果を有するものである。Further, in the embodiment shown in FIG. 7, the gas-liquid separation tube is omitted, and the shape of the draft tube is such that the upper half has a small diameter and the lower half has a large diameter. A chamber R is provided, and a bubble discharge pipe is projected from this chamber, and has the same effect as that of the first embodiment.
【００１７】[0017]
【発明の効果】本発明高水深曝気槽における曝気装置は
曝気槽内に鉛直方向に、しかも槽底に達する縦方向の循
環水流が発生しやすいようにして設けたドラフトチュー
ブ内に気液分離管を配設するとともにこの気液分離管の
上方にスクリュー式曝気機を配設し、かつ気液分離管よ
り合体した気泡をドラフトチューブ外へ導き放出するた
めの気泡排出管を突設して成るため、ドラフトチューブ
内に発生する微細気泡を含む下向流は合体した気泡塊の
浮力に邪魔されることなく槽底まで達し、安定した循環
水流とともに効率的な撹拌曝気が行える利点がある。The aeration device in the deep water aeration tank according to the present invention is a gas-liquid separation pipe in a draft tube provided in the aeration tank in a vertical direction so that a vertical circulating water flow reaching the tank bottom is easily generated. And a screw type aerator above the gas-liquid separation pipe, and a protruding bubble discharge pipe for guiding and discharging the combined bubbles from the gas-liquid separation pipe to the outside of the draft tube. Therefore, the downward flow containing the fine bubbles generated in the draft tube reaches the bottom of the tank without being hindered by the buoyancy of the coalesced bubble lumps, and there is an advantage that a stable circulating water flow and efficient stirring and aeration can be performed.
【図１】本発明高水深曝気槽における曝気装置の一実施
例を示す原理図である。FIG. 1 is a principle view showing an embodiment of an aeration device in a deep water aeration tank of the present invention.
【図２】運転初期の説明図である。FIG. 2 is an explanatory diagram at the beginning of operation.
【図３】循環水流が安定した状態を示す説明図である。FIG. 3 is an explanatory diagram showing a state in which the circulating water flow is stable.
【図４】本発明の縦断正面図である。FIG. 4 is a vertical sectional front view of the present invention.
【図５】同平面図である。FIG. 5 is a plan view of the same.
【図６】第２実施例の説明図である。FIG. 6 is an explanatory diagram of a second embodiment.
【図７】第３実施例の説明図である。FIG. 7 is an explanatory diagram of the third embodiment.
１ 高水深曝気槽 ２ 曝気機 ３ ドラフトチューブ ５ 気液分離管 ６ 気泡排出管 1 High water depth aeration tank 2 Aerator 3 Draft tube 5 Gas-liquid separation pipe 6 Bubble discharge pipe
Claims (1)
する縦方向の循環水流が発生しやすいようにして設けた
ドラフトチューブ内に気液分離管を配設するとともにこ
の気液分離管の上方にスクリュー式曝気機を配設し、か
つ気液分離管より合体した気泡をドラフトチューブ外へ
導き放出するための気泡排出管を突設して成る高水深曝
気槽における曝気装置。1. A gas-liquid separation tube is provided in a draft tube provided in the aeration tank vertically so that a vertical circulating water flow reaching the tank bottom is easily generated. An aerator in a high water depth aeration tank, in which a screw type aerator is installed above and a bubble discharge pipe for projecting and discharging bubbles combined from a gas-liquid separation pipe to the outside of the draft tube is projected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23893793A JP3444631B2 (en) | 1993-08-30 | 1993-08-30 | Aeration equipment in high water depth aeration tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23893793A JP3444631B2 (en) | 1993-08-30 | 1993-08-30 | Aeration equipment in high water depth aeration tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0760283A true JPH0760283A (en) | 1995-03-07 |
| JP3444631B2 JP3444631B2 (en) | 2003-09-08 |
Family
ID=17037502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23893793A Expired - Fee Related JP3444631B2 (en) | 1993-08-30 | 1993-08-30 | Aeration equipment in high water depth aeration tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3444631B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003053371A (en) * | 2001-08-20 | 2003-02-25 | Ataka Construction & Engineering Co Ltd | Aeration mixing apparatus |
| US7748891B2 (en) * | 2007-02-27 | 2010-07-06 | Chicago Bridge & Iron Company | Liquid storage tank with draft tube mixing system |
| CN113697973A (en) * | 2021-10-14 | 2021-11-26 | 无锡工源环境科技股份有限公司 | Multifunctional micro-nano aeration equipment |
| KR20220103489A (en) * | 2021-01-15 | 2022-07-22 | 윤영숙 | Nano-bubble generator |
-
1993
- 1993-08-30 JP JP23893793A patent/JP3444631B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003053371A (en) * | 2001-08-20 | 2003-02-25 | Ataka Construction & Engineering Co Ltd | Aeration mixing apparatus |
| US7748891B2 (en) * | 2007-02-27 | 2010-07-06 | Chicago Bridge & Iron Company | Liquid storage tank with draft tube mixing system |
| US8157432B2 (en) * | 2007-02-27 | 2012-04-17 | Chicago Bridge & Iron Company | Method of mixing a fluid in a tank with a draft tube mixing system |
| KR20220103489A (en) * | 2021-01-15 | 2022-07-22 | 윤영숙 | Nano-bubble generator |
| CN113697973A (en) * | 2021-10-14 | 2021-11-26 | 无锡工源环境科技股份有限公司 | Multifunctional micro-nano aeration equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3444631B2 (en) | 2003-09-08 |
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