JP4326677B2 - Scum treatment method in a recirculation aeration tank - Google Patents

Scum treatment method in a recirculation aeration tank Download PDF

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Publication number
JP4326677B2
JP4326677B2 JP2000207598A JP2000207598A JP4326677B2 JP 4326677 B2 JP4326677 B2 JP 4326677B2 JP 2000207598 A JP2000207598 A JP 2000207598A JP 2000207598 A JP2000207598 A JP 2000207598A JP 4326677 B2 JP4326677 B2 JP 4326677B2
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Prior art keywords
aeration tank
water
scum
sewage
treatment method
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JP2000207598A
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Japanese (ja)
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JP2002018476A (en
Inventor
誠一 田辺
浩輔 大出
学 武内
英明 浜田
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Hitachi Plant Technologies Ltd
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Hitachi Plant Technologies Ltd
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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)
  • Removal Of Floating Material (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、回流式の曝気槽におけるスカムの処理方法に関し、特に、下水処理場等に設けられる回流式の曝気槽において、曝気機の運転により発生する水面近くの水流を利用して、水面に浮遊するスカムの破砕と汚水の曝気を同時に行うようにした回流式の曝気槽におけるスカムの処理方法に関するものである。
【０００２】
【従来の技術】
従来、下水処理場等に設けられる曝気設備として、図３に示すような回流式の曝気槽がある。
この回流式の曝気槽１は、曝気槽１の無終端水路１０に曝気機２を設置し、曝気機２を駆動することにより、汚水の曝気を行うとともに、無終端水路１０に水流２０を発生させて汚水を回流させ、汚水の均一な処理を行うことができるようにしている。
【０００３】
【発明が解決しようとする課題】
ところで、従来の回流式の曝気槽１は、曝気機２を駆動することにより、無終端水路１０にかなりの流速の水流２０が発生し、特に、水面近くの水流２０は、かなりの流速を有しているが、そのエネルギは、汚水の処理にはほとんど寄与せず、エネルギの無駄につながる問題があった。
【０００４】
本発明は、上記従来の回流式の曝気槽の有する問題点に鑑み、曝気機の運転により発生する水面近くの水流の持つエネルギを利用して、低エネルギコストで、水面に浮遊するスカムの破砕と汚水の曝気を同時に行うことができるようにした回流式の曝気槽におけるスカムの処理方法を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記目的を達成するため、本発明の回流式の曝気槽におけるスカムの処理方法は、スクリュー式の曝気機により水流を発生させる回流式の曝気槽におけるスカムの処理方法であって、水面近くの水流を利用して無動力で回転するように、回流式の曝気槽の水路上に回転自在に支持した軸の全長に亘って平板形状の羽根を放射状に配設した横軸式の羽根車を、回流式の曝気槽の水路を横断するように取り付け、水面直下に位置するように汚水中に浸漬した羽根車の羽根によって水面に浮遊するスカムを破砕することを特徴とする。
ここで、「無動力」とは、モータ等の駆動機構を設けないことを意味する。
【０００６】
この回流式の曝気槽におけるスカムの処理方法は、回流式の曝気槽の水路を横断するように取り付けた横軸式の羽根車を、スクリュー式の曝気機の運転により発生する水面近くの水流の持つエネルギを利用して無動力で回転させることにより、水面に浮遊するスカムの破砕と汚水の曝気を同時に行うことができる。
【０００７】
【発明の実施の形態】
以下、本発明の回流式の曝気槽におけるスカムの処理方法の実施の形態を図面に基づいて説明する。
【０００８】
図１〜図２に、本発明の回流式の曝気槽におけるスカムの処理方法を実施する曝気装置の一実施例を示す。
【０００９】
図１に示すように、この曝気装置は、無終端水路１０にスクリュー式の曝気機２を設置し、曝気機２を駆動することにより、汚水の曝気を行うとともに、無終端水路１０に水流２０を発生させて汚水を回流させ、汚水の均一な処理を行うことができるようにした回流式の曝気槽１の無終端水路１０に、水路１０を横断するように設置されるもので、横軸式の羽根車３を備えるようにしている。
【００１０】
この羽根車３は、羽根車３の下部側に位置する羽根３０の先端部が無終端水路１０の水面近くの水流２０の持つエネルギを利用しやすい水面直下に位置するように汚水中に浸漬するとともに、羽根車３の軸３３を水路壁１１に取り付けた軸受１２に回転自在に支持して、無終端水路１０を横断するように設置され、これにより、曝気機２の運転により発生する水面近くの水流２０の持つエネルギを利用して、モータ等の他の駆動機構を設けることなく無動力で回転するように構成されている。
【００１１】
なお、この羽根車３の羽根３０の形状は、流水の持つエネルギが効果的に作用する平板形状とすることができる。
【００１２】
次に、本発明の曝気装置の作用について説明する。
曝気機２を駆動することにより、無終端水路１０内の汚水の曝気を行うとともに、無終端水路１０に水流２０を発生させて汚水を回流させ、汚水の均一な処理を行うようにする。
そして、曝気機２の運転により発生する水面近くの水流２０の持つエネルギを利用して、モータ等の他の駆動機構を設けることなく無動力で、無終端水路１０を横断するように設置した羽根車３を回転するようにする。
【００１３】
羽根車３が回転すると、羽根３０が汚水中に入る側３１においては、羽根３０が水面を叩き、このとき、水面に浮遊するスカムを破砕することができる。
【００１４】
また、羽根３０が汚水中から出る側３２においては、羽根車３０により掻き上げられた汚水が遠心力によって跳ね飛ばされ、跳ね飛ばされた水滴により、曝気が促進される。
【００１５】
さらに、羽根車３が回転することにより、水面に波を生じ、この波によって、空気中の酸素を汚水中に溶け込ませ、曝気が促進される。
【００１６】
【発明の効果】
本発明の回流式の曝気槽におけるスカムの処理方法によれば、回流式の曝気槽の水路を横断するように取り付けた横軸式の羽根車を、スクリュー式の曝気機の運転により発生する水面近くの水流の持つエネルギを利用して無動力で回転させることにより、水面に浮遊するスカムの破砕と汚水の曝気を、低エネルギコストで、同時に、かつ効率的に行うことができ、汚水の処理コストを低廉にすることができる。
【図面の簡単な説明】
【図１】 本発明の回流式の曝気槽におけるスカムの処理方法を実施する曝気装置の一実施例を示す平面図である。
【図２】 図１のＸ−Ｘ線断面図である。
【図３】 従来の曝気装置を示す平面図である。
【符号の説明】
１ 曝気槽
１０ 水路
１１ 水路壁
１２ 軸受
２ 曝気機
３ 羽根車
２０ 水流[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for treating scum in a circulating aeration tank, and in particular in a circulating aeration tank provided in a sewage treatment plant or the like, using a water flow near the water surface generated by the operation of an aerator, The present invention relates to a scum treatment method in a circulating aeration tank in which floating scum is crushed and sewage is aerated simultaneously.
[0002]
[Prior art]
Conventionally, as an aeration facility provided in a sewage treatment plant or the like, there is a circulating aeration tank as shown in FIG.
This aeration-type aeration tank 1 installs an aerator 2 in an endless water channel 10 of the aeration tank 1 and drives the aerator 2 to aerate sewage and generate a water flow 20 in the endless water channel 10. The sewage is circulated to allow uniform treatment of the sewage.
[0003]
[Problems to be solved by the invention]
By the way, in the conventional circulating aeration tank 1, when the aerator 2 is driven, a water flow 20 with a considerable flow velocity is generated in the endless water channel 10, and in particular, the water flow 20 near the water surface has a considerable flow velocity. However, the energy hardly contributes to the treatment of sewage, and there is a problem that the energy is wasted.
[0004]
In view of the problems of the conventional circulating aeration tank, the present invention uses the energy of the water flow near the surface of the water generated by the operation of the aeration machine to crush the scum floating on the water surface at a low energy cost. It is an object of the present invention to provide a scum treatment method in a recirculation type aeration tank that can perform aeration of wastewater and sewage simultaneously.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a scum treatment method in a circulating aeration tank according to the present invention is a scum treatment method in a circulating aeration tank in which a water flow is generated by a screw type aerator, A horizontal shaft type impeller in which flat blades are radially arranged over the entire length of the shaft rotatably supported on the water channel of the circulating aeration tank so as to rotate without power using It is attached so as to cross the water channel of the recirculation type aeration tank, and the scum floating on the water surface is crushed by the impeller blades immersed in the sewage so as to be located just below the water surface .
Here, “no power” means that no drive mechanism such as a motor is provided.
[0006]
This scum treatment method in the recirculation aeration tank is based on a horizontal axis impeller mounted so as to cross the water channel of the recirculation aeration tank. By rotating with no power using the energy possessed, the scum floating on the water surface can be crushed and the sewage can be aerated simultaneously.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a scum treatment method in a circulating aeration tank according to the present invention will be described below with reference to the drawings.
[0008]
1 to 2 show an embodiment of an aeration apparatus for implementing the scum treatment method in the circulating type aeration tank of the present invention.
[0009]
As shown in FIG. 1, the aeration apparatus performs aeration of sewage by installing a screw type aerator 2 in an endless water channel 10 and driving the aerator 2, and a water flow 20 in the endless water channel 10. Is installed in the endless water channel 10 of the recirculation type aeration tank 1 so that the waste water can be circulated and the sewage can be uniformly treated. An impeller 3 of the type is provided.
[0010]
The impeller 3 is immersed in the sewage so that the tip of the blade 30 located on the lower side of the impeller 3 is located immediately below the water surface where the energy of the water flow 20 near the water surface of the endless water channel 10 can be easily used. At the same time, the shaft 33 of the impeller 3 is rotatably supported by the bearing 12 attached to the water channel wall 11 and is installed so as to cross the endless water channel 10, thereby near the water surface generated by the operation of the aerator 2. The energy of the water flow 20 is used to rotate without power without providing another drive mechanism such as a motor.
[0011]
In addition, the shape of the blade | wing 30 of this impeller 3 can be made into the flat plate shape in which the energy which flowing water acts effectively.
[0012]
Next, the operation of the aeration apparatus of the present invention will be described.
By driving the aerator 2, the sewage in the endless water channel 10 is aerated, and the water flow 20 is generated in the endless water channel 10 to circulate the sewage to perform uniform treatment of the sewage.
Then, using the energy of the water flow 20 near the surface of the water generated by the operation of the aerator 2, the blades installed so as to cross the endless water channel 10 without any other drive mechanism such as a motor and without power. The car 3 is rotated.
[0013]
When the impeller 3 rotates, on the side 31 where the blade 30 enters the sewage, the blade 30 hits the water surface, and at this time, the scum floating on the water surface can be crushed.
[0014]
In addition, on the side 32 where the blade 30 exits from the sewage, the sewage picked up by the impeller 30 is splashed off by centrifugal force, and aeration is promoted by the splashed water droplets.
[0015]
Furthermore, when the impeller 3 rotates, a wave is generated on the water surface, and the oxygen in the air is dissolved into the sewage by this wave, and aeration is promoted.
[0016]
【The invention's effect】
According to the scum treatment method in the circulating aeration tank of the present invention, the horizontal axis impeller mounted so as to cross the water channel of the circulating aeration tank is a water surface generated by the operation of the screw aerator. By using the energy of the nearby water stream to rotate without power, the scum that floats on the surface of the water and the aeration of sewage can be simultaneously and efficiently performed at a low energy cost. Cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of an aeration apparatus for carrying out a scum treatment method in a circulating aeration tank according to the present invention.
FIG. 2 is a cross-sectional view taken along line XX in FIG.
FIG. 3 is a plan view showing a conventional aeration apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Aeration tank 10 Water channel 11 Water channel wall 12 Bearing 2 Aeration machine 3 Impeller 20 Water flow

Claims (1)

スクリュー式の曝気機により水流を発生させる回流式の曝気槽におけるスカムの処理方法であって、水面近くの水流を利用して無動力で回転するように、回流式の曝気槽の水路上に回転自在に支持した軸の全長に亘って平板形状の羽根を放射状に配設した横軸式の羽根車を、回流式の曝気槽の水路を横断するように取り付け、水面直下に位置するように汚水中に浸漬した羽根車の羽根によって水面に浮遊するスカムを破砕することを特徴とする回流式の曝気槽におけるスカムの処理方法。A scum treatment method in a recirculation type aeration tank that generates a water flow with a screw type aerator, and rotates on the water channel of a recirculation type aeration tank so that it rotates without power using a water flow near the water surface. A horizontal-shaft impeller with flat blades radially arranged over the length of the freely supported shaft is attached so as to cross the water channel of the circulating aeration tank, and the sewage is located directly below the water surface. A method for treating scum in a circulating aeration tank, characterized in that scum floating on the water surface is crushed by impeller blades immersed therein .
JP2000207598A 2000-07-10 2000-07-10 Scum treatment method in a recirculation aeration tank Expired - Fee Related JP4326677B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000207598A JP4326677B2 (en) 2000-07-10 2000-07-10 Scum treatment method in a recirculation aeration tank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000207598A JP4326677B2 (en) 2000-07-10 2000-07-10 Scum treatment method in a recirculation aeration tank

Publications (2)

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JP2002018476A JP2002018476A (en) 2002-01-22
JP4326677B2 true JP4326677B2 (en) 2009-09-09

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