JPH09299984A - Aeration device - Google Patents

Aeration device

Info

Publication number
JPH09299984A
JPH09299984A JP8147972A JP14797296A JPH09299984A JP H09299984 A JPH09299984 A JP H09299984A JP 8147972 A JP8147972 A JP 8147972A JP 14797296 A JP14797296 A JP 14797296A JP H09299984 A JPH09299984 A JP H09299984A
Authority
JP
Japan
Prior art keywords
screw
water
draft tube
aeration
branch pipe
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.)
Pending
Application number
JP8147972A
Other languages
Japanese (ja)
Inventor
Masahiro Goto
正広 後藤
Seiichi Tanabe
誠一 田辺
Manabu Takeuchi
学 武内
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Kiden Kogyo Ltd
Original Assignee
Hitachi Kiden Kogyo Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Kiden Kogyo Ltd filed Critical Hitachi Kiden Kogyo Ltd
Priority to JP8147972A priority Critical patent/JPH09299984A/en
Publication of JPH09299984A publication Critical patent/JPH09299984A/en
Pending legal-status Critical Current

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

PROBLEM TO BE SOLVED: To enable water flow to reach a distant place from an aeration machine and to improve the efficiency of the stirring aeration in a vessel by providing the device with the aeration machine which blows gas into liquid to aerate the liquid by utilizing the negative pressure generated in the water basin at the front end of a screw rotated by driving of a motor and disposing a draft tube at the front end of a screw. SOLUTION: The aeration machine A is constituted by fixing the screw the front end, i.e., the bottom end of a hollow shaft 2 rotationally driven by the motor 1 and forms negative pressure within the water basin at the front end of the screw 3 by rotation of this screw 3. A draft tube 7 formed to a Tee shape is disposed at the front end of the screw 3 and the water flow generated by turning of the screw 3 is introduced into the draft tube 7. The draft tube 7 is extended with a branch pipe 8 upward in its mid-way and the front end of this branch pipe 8 is so disposed as to project upward from a water surface position or water surface. As a result, the flow velocity of the water flow at the front end of the screw 3 is increased and the recovery of scum S is facilitated.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、曝気装置、特に曝
気機に対向配設したドラフトチューブにて水中に発生す
るスカムを定位置に集積し槽全体に均一な撹拌曝気を行
う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 device, and in particular to an aeration device in which scum generated in water is accumulated at a fixed position by a draft tube disposed facing the aeration device to perform uniform aeration and aeration in the entire tank. It relates to the device.

【０００２】[0002]

【従来の技術】従来汚水の処理方法として、汚水中を撹
拌しつつ汚水中に空気を供給して撹拌曝気し、汚水中の
有機物を分解処理する方法が提案されている。この汚水
の処理方法として、特公昭５６−２１４５２号公報に開
示されている。これは図３に示すようにモータにて駆動
される中空シャフトの下端にスクリューを固定し、モー
タの駆動にて中空シャフトを介してスクリューを回動し
て、スクリュー先端水域の汚水を撹拌しつつ前方へ押し
出されるとともにスクリュー先端水域に発生する負圧に
て、中空シャフトを介して大気空気を吸入してスクリュ
ー先端水域内に微細気泡として放出し撹拌汚水と混合し
て曝気し、汚水中の有機物の分解処理を行っている。2. Description of the Related Art Conventionally, as a method for treating sewage, there has been proposed a method for decomposing and treating organic matter in sewage by supplying air into the sewage while stirring and aerating the sewage. A method for treating this sewage is disclosed in Japanese Examined Patent Publication No. 56-21452. As shown in FIG. 3, a screw is fixed to the lower end of a hollow shaft driven by a motor, and the screw is rotated through the hollow shaft by driving the motor while stirring the waste water in the screw tip water area. At the negative pressure generated in the screw tip water area while being pushed forward, atmospheric air is sucked through the hollow shaft and discharged as fine bubbles into the screw tip water area and mixed with agitation wastewater to aerate, and organic matter in the wastewater Is being decomposed.

【０００３】[0003]

【発明が解決しようとする課題】上記従来の曝気装置に
おいては、モータの駆動にてスクリューが回転しこれに
伴い液体は曝気され前方に押し出されるが、しかし液体
中に送り込まれた気泡はその浮力にて上昇する際、その
気泡の上昇部分の水域が大きな壁となり、ここを境とし
て液体表層部に逆流が発生し、これによりスクリューに
て押し出される流速の減少をきたし、これにより槽全体
の均一な撹拌曝気が行えず、また発生スカムも水面のい
たる所で発生し、集積部へ移送されずに水面に浮遊し、
特に曝気装置近傍に集積して景観を害するものとなると
いう問題点があった。本発明は、上記従来の曝気装置の
有する問題点を解決し、曝気装置のスクリューによって
水域内に発生する逆流を解消するとともに、曝気にて発
生するスカムを曝気装置より離れた位置まで移送し、予
め定めた位置に集積するようにすることができる曝気装
置を提供することを目的とする。In the conventional aeration apparatus described above, the screw is rotated by the drive of the motor, and the liquid is aerated and pushed forward with the rotation of the screw. However, the bubbles fed into the liquid are buoyant. At the time of rising, the water area in the rising part of the bubble becomes a large wall, and a backflow occurs at the liquid surface layer part at this boundary, which causes a decrease in the flow velocity pushed out by the screw, which makes the entire tank uniform. Agitating and aeration cannot be performed, and generated scum is generated everywhere on the water surface, and is not transferred to the accumulating part and floats on the water surface.
In particular, there is a problem in that it accumulates in the vicinity of the aeration device and damages the landscape. The present invention solves the problems of the conventional aeration device, eliminates the backflow generated in the water area by the screw of the aeration device, and transfers scum generated by aeration to a position away from the aeration device, It is an object of the present invention to provide an aeration device that can be integrated at a predetermined position.

【０００４】[0004]

【課題を解決するための手段】上記目的を達成するた
め、本発明の曝気装置は、モータの駆動にて回転するス
クリュー先端水域に生ずる負圧を利用して気体を液体中
に吹き込み曝気する曝気機と、スクリュー先端に配設
し、スクリューの旋回にて発生する水流を導びくドラフ
トチューブと、ドラフトチューブから分岐して水面に向
かって延設した枝管とからなることを特徴とする。In order to achieve the above object, the aeration apparatus of the present invention is an aeration apparatus for aeration by injecting a gas into a liquid by utilizing a negative pressure generated in a screw tip water region rotated by a drive of a motor. The machine is characterized by comprising a machine, a draft tube which is arranged at the tip of the screw and which guides the water flow generated by the rotation of the screw, and a branch pipe which is branched from the draft tube and extends toward the water surface.

【０００５】上記の構成からなる本発明の曝気装置は、
スクリュー式の曝気機とドラフトチューブとを組み合わ
せることにより、液表層部の逆流を防止して水域内に発
生する水流速度の低下を招かず、スクリュー先端水流の
流速の増加を図ることができる。The aeration apparatus of the present invention having the above structure is
By combining the screw type aerator and the draft tube, it is possible to prevent the backflow of the liquid surface layer portion and prevent the decrease of the water flow velocity generated in the water area, and to increase the flow velocity of the water flow at the tip of the screw.

【０００６】この場合、枝管の先端を水面上方位置に開
口することができる。In this case, the tip of the branch pipe can be opened above the water surface.

【０００７】上記の構成からなる本発明の曝気装置にお
いては、ドラフトチューブの枝管内に発生スカムを集積
することができる。In the aeration apparatus of the present invention having the above structure, the generated scum can be accumulated in the branch pipe of the draft tube.

【０００８】この場合、枝管の先端を水面位置に開口す
ることができる。In this case, the tip of the branch pipe can be opened at the water surface position.

【０００９】上記の構成からなる本発明の曝気装置にお
いては、ドラフトチューブの本管に突設した枝管を水面
位置としているので、発生したスカムはこの枝館内を上
昇した後、水面表層部の水流に乗って水面上を集積位置
まで移送されため、スカムの回収が容易に行える。In the aeration apparatus of the present invention having the above structure, since the branch pipe projecting from the main pipe of the draft tube is located at the water surface position, the generated scum rises in this branch room, and then the scum of the water surface layer is formed. The scum can be easily collected because it is carried on the water surface to the accumulation position by riding the water flow.

【００１０】[0010]

【発明の実施の形態】以下、本発明の曝気装置の実施の
形態を図面に基づいて説明する。図において１は曝気機
で、この曝気機１は図１に詳示するように、モータ１に
て駆動するようにして中空シャフト２を取り付け、この
中空シャフト２の先端、即ち下端にスクリュー３を固定
して構成する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the aeration apparatus of the present invention will be described below with reference to the drawings. In the figure, reference numeral 1 is an aerator, and as shown in detail in FIG. 1, the aerator 1 is attached with a hollow shaft 2 so as to be driven by a motor 1, and a screw 3 is attached to the tip, that is, the lower end of the hollow shaft 2. Fixed and configured.

【００１１】そして、このモータ１の駆動にて中空シャ
フト２を介してスクリュー３を回動させ、このスクリュ
ーの回転に伴い液体は水域の前方に押し出されるととも
に、スクリュー先端水域内に負圧が形成され中空シャフ
トより気体が液体中に供給される。従来技術では、中空
シャフトの端から吐出される気体がスクリュー式曝気装
置の下流部で広範囲に上昇流４が発生しスカムが形成さ
れとともに、液表層の流れを妨げる壁のような存在にな
り、ここを境に液表層に順流５と逆流６が生じ、スクリ
ュー先端水域の流速の減少が生じていた。本発明ではこ
の気泡の上昇水域の大きな壁の発生を防止するため、ス
クリュー式の曝気装置Ａと、ドラフトチューブ７とを組
み合わせることにより、気泡上昇域の限定が可能とな
り、この結果液表層の逆流の発生が抑制され流速が向上
するものとなる。The motor 1 is driven to rotate the screw 3 through the hollow shaft 2. The rotation of the screw pushes the liquid toward the front of the water area, and a negative pressure is formed in the water area at the tip of the screw. Then, the gas is supplied into the liquid from the hollow shaft. In the prior art, the gas discharged from the end of the hollow shaft forms an upward flow 4 in a wide area downstream of the screw type aeration device to form scum, and becomes a wall that impedes the flow of the liquid surface layer. At this boundary, a forward flow 5 and a reverse flow 6 were generated in the liquid surface layer, and the flow velocity in the screw tip water region was reduced. In the present invention, in order to prevent the generation of a large wall in the rising water region of the bubbles, by combining the screw type aeration device A and the draft tube 7, it becomes possible to limit the bubble rising region, and as a result, the reverse flow of the liquid surface layer Is suppressed and the flow velocity is improved.

【００１２】図１に示した曝気装置においては、モータ
１、中空シャフト２、スクリュー３より構成される曝気
装置Ａのスクリュー３の先端と対向してＴ字形をしたド
ラフトチューブ７を配設する。このスクリュー先端とド
ラフトチューブとの間隔は予め定めたものとしスクリュ
ーの回動にて発生する水流をこのドラフトチューブ内に
導くようにする。従ってドラフトチューブ７はこの発生
水流の方向と軸心が一致するように配設するのが望まし
い。In the aeration apparatus shown in FIG. 1, a T-shaped draft tube 7 is provided so as to face the tip of the screw 3 of the aeration apparatus A which is composed of the motor 1, the hollow shaft 2 and the screw 3. The distance between the tip of the screw and the draft tube is set in advance so that the water flow generated by the rotation of the screw is guided into the draft tube. Therefore, it is desirable that the draft tube 7 is arranged so that the axis of the draft tube 7 coincides with the direction of the generated water flow.

【００１３】ドラフトチューブ７はその途中に枝管８を
上方向に延びるようにして設け、この枝管８の先端は水
面位置若しくは水面より上方に突出するようにして配設
する。このようにすることによりスクリューで発生した
水流は図２に示すようにドラフトチューブの本管内を通
過するため、流速ベクトルは流下方行に限定され流れが
形成されるとともに、本管内を流下する途中において水
流中に含まれる気泡は液体と分離して浮上せんとする。
そして水流にのって流下する速度よりも気泡の浮力が増
した位置で気泡は水流から分離して本管から枝管８へ導
かれ、この枝管８内を気泡は上昇し大気中へ排出され
る。これにより気泡の上昇域は限定され、液表層には順
流９のみが形成され、その結果流速の向上が図られるも
のとなる。A branch tube 8 is provided in the middle of the draft tube 7 so as to extend upward, and the tip of the branch tube 8 is arranged so as to project at a water surface position or above the water surface. By doing so, the water flow generated by the screw passes through the inside of the main pipe of the draft tube as shown in FIG. 2, so that the flow velocity vector is limited to the downward flow, and a flow is formed, while flowing down in the main pipe. At, the bubbles contained in the water flow separate from the liquid and float.
Then, at a position where the buoyancy of the bubbles is higher than the velocity of the water flowing down, the bubbles are separated from the water flow and guided from the main pipe to the branch pipe 8. The bubbles rise inside the branch pipe 8 and are discharged into the atmosphere. To be done. As a result, the rising region of the bubbles is limited, and only the forward flow 9 is formed in the liquid surface layer, and as a result, the flow velocity is improved.

【００１４】図１に示す実施例はドラフトチューブの枝
管８は水面上方に突出するようにしてドラフトチューブ
内の水流中の気泡が水流より分離して上昇する際、スカ
ムＳが発生するとともにスカムＳも上昇して集積され
る。In the embodiment shown in FIG. 1, the branch tube 8 of the draft tube is projected above the water surface so that when the bubbles in the water flow inside the draft tube rise apart from the water flow, scum S is generated and scum is generated. S also rises and is accumulated.

【００１５】また、図２に示す実施例は枝管８を水面位
置としドラフトチューブ内の水流中の気泡が水流より分
離してスカムが発生するとともにこの枝管内を上昇して
水面位置にて放出される。この水面位置に放出されたス
カムＳは水面のスカム移送水流１０に乗って移送され、
予め定めた位置に集積されるものである。In the embodiment shown in FIG. 2, the branch pipe 8 is positioned at the water surface, and the bubbles in the water flow in the draft tube are separated from the water flow to generate scum. To be done. The scum S discharged to this water surface position is carried on the scum transfer water stream 10 on the water surface,
It is collected at a predetermined position.

【００１６】[0016]

【発明の効果】本発明の曝気装置によれば、スクリュー
の旋回にて発生する水流をドラフトチューブ内に導びき
流速を増加させるようにしているので、スクリュー先端
水域の流速が減衰することがなく強い水流にてドラフト
チューブ内を流下させられ曝気機より遠方へ達して槽内
の撹拌曝気の向上が図られるとともに、発生スカムを予
め定めた位置に集積できる。According to the aeration apparatus of the present invention, since the water flow generated by the swirling of the screw is guided into the draft tube to increase the flow velocity, the flow velocity in the water region at the tip of the screw is not attenuated. A strong water flow causes the water to flow down in the draft tube to reach a distance from the aerator to improve stirring and aeration in the tank, and the generated scum can be accumulated at a predetermined position.

【００１７】本発明の請求項２記載の曝気装置によれ
ば、ドラフトチューブの本管に枝管を突設してＴ字形と
し、枝管を水面より突出するようにしているので、ドラ
フトチューブの枝管内に発生スカムを集積することがで
きる。According to the aeration apparatus according to the second aspect of the present invention, the branch pipe is projectingly provided in the main pipe of the draft tube to form a T shape, and the branch pipe is projected from the water surface. The generated scum can be accumulated in the branch pipe.

【００１８】本発明の請求項３記載の曝気装置によれ
ば、ドラフトチューブの本管に枝管を突設してＴ字形と
し、枝管の先端を水面位置としているので、発生したス
カムはこの枝館内を上昇した後、水面表層部の水流に乗
って水面上を集積位置まで移送されため、スカムの回収
が容易に行える。According to the aeration apparatus of the third aspect of the present invention, since the branch pipe is projected to the main pipe of the draft tube to form a T shape, and the tip of the branch pipe is located on the water surface, the generated scum is generated. After ascending in the branch building, the scum can be easily collected because it rides on the water stream on the surface of the water surface and is transferred to the accumulation position on the water surface.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の曝気装置の第１実施例を示す図であ
る。FIG. 1 is a diagram showing a first embodiment of an aeration apparatus of the present invention.

【図２】本発明の曝気装置の第２実施例を示す図であ
る。FIG. 2 is a diagram showing a second embodiment of the aeration apparatus of the present invention.

【図３】従来の曝気装置を示す図である。FIG. 3 is a diagram showing a conventional aeration device.

【符号の説明】[Explanation of symbols]

１ モータ ２ 中空シャフト ３ スクリュー ４ 上昇流 ５ 順流 ６ 逆流 ７ ドラフトチューブの枝管 ８ ドラフトチューブの枝管 ９ 本発明による順流 １０ スカム移送水流 Ｓ スカム DESCRIPTION OF SYMBOLS 1 Motor 2 Hollow shaft 3 Screw 4 Upflow 5 Forward flow 6 Backflow 7 Draft tube branch pipe 8 Draft tube branch pipe 9 Forward flow according to the present invention 10 Scum transfer water flow S scum

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 モータの駆動にて回転するスクリューの
先端水域に生ずる負圧を利用して気体を液体中に吹き込
み曝気する曝気機と、スクリュー先端に配設し、スクリ
ューの旋回にて発生する水流を導びくドラフトチューブ
と、ドラフトチューブから分岐して水面に向かって延設
した枝管とからなることを特徴とする曝気装置。1. An aerator for aeration by injecting gas into a liquid by utilizing a negative pressure generated in a water area at the tip of a screw rotated by driving a motor, and an aerator installed at the tip of the screw and generated by swirling of the screw. An aeration device comprising: a draft tube that guides a water flow; and a branch pipe that branches from the draft tube and extends toward the water surface. 【請求項２】 枝管の先端を水面上方位置に開口したこ
とを特徴とする請求項１記載の曝気装置。2. The aeration apparatus according to claim 1, wherein the tip of the branch pipe is opened at a position above the water surface. 【請求項３】 枝管の先端を水面位置に開口したことを
特徴とする請求項１記載の曝気装置。3. The aeration apparatus according to claim 1, wherein a tip of the branch pipe is opened at a water surface position.
JP8147972A 1996-05-17 1996-05-17 Aeration device Pending JPH09299984A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8147972A JPH09299984A (en) 1996-05-17 1996-05-17 Aeration device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8147972A JPH09299984A (en) 1996-05-17 1996-05-17 Aeration device

Publications (1)

Publication Number Publication Date
JPH09299984A true JPH09299984A (en) 1997-11-25

Family

ID=15442274

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8147972A Pending JPH09299984A (en) 1996-05-17 1996-05-17 Aeration device

Country Status (1)

Country Link
JP (1) JPH09299984A (en)

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