JP2010162454A - Oligoaerobic state improving apparatus arranged in closed water area - Google Patents

Oligoaerobic state improving apparatus arranged in closed water area Download PDF

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JP2010162454A
JP2010162454A JP2009005559A JP2009005559A JP2010162454A JP 2010162454 A JP2010162454 A JP 2010162454A JP 2009005559 A JP2009005559 A JP 2009005559A JP 2009005559 A JP2009005559 A JP 2009005559A JP 2010162454 A JP2010162454 A JP 2010162454A
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water
pipe
aeration tank
aeration
closed
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JP4979716B2 (en
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Sokushi Morioka
速視 森岡
Hideyuki Tamura
秀行 田村
Seiji Kino
清治 城野
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KAIYO KAIHATSU GIJUTSU KENKYUS
KAIYO KAIHATSU GIJUTSU KENKYUSHO KK
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KAIYO KAIHATSU GIJUTSU KENKYUS
KAIYO KAIHATSU GIJUTSU KENKYUSHO KK
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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
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    • Y02W10/10—Biological treatment of water, waste water, or sewage

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an oligoaerobic state improving apparatus arranged in a closed water area capable of improving the oligoaerobic state of the layer between a water supply port and a water discharge port by pumping up oligoaerobic water in the bottom of the closed water area up to the vicinity of the surface of the water through a water supply pipe by a propeller to guide the same to the aeration tank in the vicinity of the surface of the water and aerating the oligoaerobic water in the aeration tank by an air diffusion pipe to again send the aerated water to the bottom of the closed water area by a water discharge pipe. <P>SOLUTION: The aeration tank 4 is floated on the surface of the water of the closed water area, the air diffusion pipe 4 for blowing off oxygen or air bubbles is arranged to the bottom of the aeration tank 4, the upper end of the water supply pipe 2, which is opened to the bottom of the closed water area at its lower end and becomes a water channel for pumping up the oligoaerobic water in the bottom of the closed water area, and the upper end of the water discharge pipe 5, which becomes a water channel for pumping up the aerated water in the aeration tank 4 to the bottom of the closed water area, are respectively connected to the bottom of the aeration tank on both end sides of the diffusion pipe 41 so as to hold the diffusion pipe 41, and the propeller 3, which produces a water stream for pumping up the oligoaerobic water in the bottom of the closed water area up to the aeration tank 4, is provided in the water supply pipe 2 or on the upper end side in the water discharge pipe 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

この発明は、例えば、ダム、湖水、人工湖沼や自然湖沼などの閉鎖水域で出現する貧酸素状態を改善する閉鎖水域の貧酸素改善装置に関するものである。   The present invention relates to an apparatus for improving anoxia in a closed water area that improves an anoxic state appearing in a closed water area such as a dam, a lake, an artificial lake or a natural lake.

例えば、ダム、湖水、人工湖沼や自然湖沼などの閉鎖水域では富栄養化に伴い、貧酸素状態が出現することが多い。貧酸素状態は通常、閉鎖水域例えば湖沼底部で発生するが、湖沼によっては中層付近まで広がることがある。この貧酸素状態を改善するのに図７（Ａ）（Ｂ）のように、湖水などの閉鎖水域の鉛直循環を起こす方法が用いられる。
原理は、鉛直方向の水循環を起こして水表面からとけ込む酸素を、湖水などの閉鎖水域全体に行き渡らせるというものである。図７（Ｂ）の空気を用いる方式は、気泡ａからの酸素のとけ込みも期待できるが、水面からのとけ込み量に較べ小さく、空気の上昇に伴い水を動かすことが目的である。
閉鎖水域例えば湖水の水量が小さい場合はこれらの方法が用いられるが、水量が膨大になると、湖水全体の循環を起こそうとすれば、多くの装置や電力が必要となる。そこで、貧酸素状態が最も激しい貧酸素改善領域ｂの底層水のみに酸素を供給する目的で図８（Ａ）〜（Ｃ）のような装置が用いられる。 For example, in closed water areas such as dams, lakes, artificial lakes and natural lakes, anoxic conditions often appear with eutrophication. Anoxic conditions usually occur in closed water areas such as the bottom of a lake, but depending on the lake, it may spread to the middle. In order to improve this poor oxygen state, as shown in FIGS. 7A and 7B, a method of causing vertical circulation in a closed water area such as lake water is used.
The principle is that oxygen flowing from the surface of the water by causing a vertical water circulation to spread throughout the closed water area such as lake water. The method using air in FIG. 7B can be expected to cause oxygen penetration from the bubbles a, but is smaller than the amount of penetration from the water surface and is intended to move water as the air rises.
These methods are used when the amount of water in a closed water area, such as lake water, is small. However, if the amount of water becomes enormous, many devices and electric power are required to cause circulation of the entire lake water. Therefore, an apparatus as shown in FIGS. 8A to 8C is used for the purpose of supplying oxygen only to the bottom layer water in the poor oxygen improvement region b in which the poor oxygen state is most severe.

しかしながら、この図８（Ａ）〜（Ｃ）の方式の問題は、散気管９３は底部にあるため、閉鎖水域の例えば深いダムでは大きな水圧に打ち勝つため圧縮空気発生装置で空気を送らねばならないことで、電力の消費量が大きくなることである。
また、広い範囲に酸素をおくるためには、多量の水量を循環させねばならないが、空気の上昇に伴い発生する水の動きでは不十分であり、結果的に多くの台数が必要となる。 However, the problem with the system shown in FIGS. 8A to 8C is that the air diffuser 93 is at the bottom, so that, for example, in a deep dam in a closed water area, air must be sent by a compressed air generator to overcome a large water pressure. Thus, the amount of power consumption increases.
Further, in order to place oxygen in a wide range, a large amount of water must be circulated, but the movement of water generated as the air rises is not sufficient, and as a result, a large number of units are required.

この発明は、上記のような課題に鑑み、その課題を解決すべく創案されたものであって、その目的とするところは、プロペラによって閉鎖水域の底部の貧酸素水を水面近くまで送入管を通じて引き上げ、水面近くの曝気水槽に導き、曝気水槽内で散気管によって曝気を行い、その水を再び送出管で底部に送り込み、送入口と送出口の間の層の貧酸素状態を改善することのできる閉鎖水域の貧酸素改善装置を提供することにある。   In view of the above-described problems, the present invention has been made to solve the problems, and the object of the present invention is to supply the oxygen-poor water at the bottom of the closed water area near the water surface by a propeller. To the aeration tank near the surface of the water, aerated in the aeration tank by the diffusing pipe, the water is again sent to the bottom by the delivery pipe, to improve the poor oxygen state of the layer between the inlet and outlet An object of the present invention is to provide a device for improving anoxia in a closed water area.

以上の課題を解決するために、請求項１の発明は、閉鎖水域の水面に曝気水槽を浮かべ、水面に浮かぶ曝気水槽の底部に酸素又は空気を気泡として吹き出す散気管を配管し、散気管を挟んでその両端側に、閉鎖水域の底部に下端が開口され底部の貧酸素水の引き上げ水路となる送入管の上端と、曝気水槽内で曝気された曝気水を底部に送り出す水路となる送出管の上端とをそれぞれ接続し、閉鎖水域の底部の貧酸素水を曝気水槽まで引き上げる水流を発生させるプロペラを送入管内の上端側に設けた手段よりなるものである。   In order to solve the above problems, the invention of claim 1 is characterized in that an aeration tank is floated on the surface of a closed water area, and an aeration pipe that blows oxygen or air as bubbles at the bottom of the aeration tank floating on the water surface is provided. At the both ends of the sandwiched water area, the bottom end of the closed water area is opened at the bottom, the top end of the feed pipe serving as a pull-up channel for the anoxic water at the bottom, and the delivery serving as the channel for sending aerated water aerated in the aeration tank to the bottom The upper end of the pipe is connected to each other, and a propeller for generating a water flow for raising the oxygen-poor water at the bottom of the closed water area to the aeration tank is provided on the upper end side in the feed pipe.

また、以上の課題を解決するために、請求項２の発明は、閉鎖水域の水面に曝気水槽を浮かべ、水面に浮かぶ曝気水槽の底部に酸素又は空気を気泡として吹き出す散気管を配管し、散気管を挟んでその両端側に、閉鎖水域の底部に下端が開口され底部の貧酸素水の引き上げ水路となる送入管の上端と、曝気水槽内で曝気された曝気水を底部に送り出す水路となる送出管の上端とをそれぞれ接続し、閉鎖水域の底部の貧酸素水を曝気水槽まで引き上げる水流を発生させるプロペラを送出管内の上端側に設けた手段よりなるものである。   In order to solve the above-mentioned problems, the invention of claim 2 is characterized in that an aeration tank is floated on the surface of a closed water area, and an aeration pipe for blowing oxygen or air as bubbles at the bottom of the aeration tank floating on the water surface is provided. On both sides of the trachea, at the bottom of the closed water area, the lower end is opened at the bottom, and the upper end of the inlet pipe that becomes the channel for raising the oxygen-absorbing water at the bottom; The propeller is connected to the upper end of the delivery pipe, and a propeller is provided on the upper end side of the delivery pipe to generate a water flow for raising the oxygen-poor water at the bottom of the closed water area to the aeration tank.

また、以上の課題を解決するために、請求項３の発明は、閉鎖水域の水面に曝気水槽を浮かべ、水面に浮かぶ曝気水槽の底部に酸素又は空気を気泡として吹き出す散気管を配管し、曝気水槽の一端側に閉鎖水域の底部に下端が開口され底部の貧酸素水の引き上げ水路となる送入管の上端を接続し、散気管が配管された側の底部側に曝気水槽内で曝気された曝気水を底部に送り出す水路となる送出管の上端を接続し、閉鎖水域の底部の貧酸素水を曝気水槽まで引き上げる水流を発生させるプロペラを送入管内の上端側に設け、散気管と送入管の上端が接続開口する流入口との間に越流仕切板を設けて仕切り、越流仕切板で仕切られた曝気水槽内の散気管が配管された側の水面近くに整流板を配置すると共に、送出管の上端が接続開口する流出口に向かって降下する曝気水槽内の水流降下速度を気泡上昇速度よりわずかに小さくした手段よりなるものである。   In order to solve the above-mentioned problems, the invention of claim 3 is characterized in that an aeration tank is floated on the surface of a closed water area, and a diffuser pipe for blowing oxygen or air as bubbles at the bottom of the aeration tank floating on the water surface is provided. One end of the aquarium is connected to the bottom of the closed water area and the bottom of the aeration tank is connected to the upper end of the inlet pipe that serves as a drainage channel for the anoxic water at the bottom. A propeller is installed on the upper end side of the inlet pipe to connect the upper end of the delivery pipe, which serves as a water channel for sending out the aerated water to the bottom, and to generate a water flow that pulls the oxygen-poor water at the bottom of the closed water area up to the aeration tank. An overflow partition plate is provided between the inlet and the inlet where the upper end of the inlet pipe opens, and a rectifying plate is placed near the water surface on the side where the diffuser pipe in the aeration tank partitioned by the overflow partition plate is piped And the outlet where the upper end of the delivery pipe opens The water flow rate of descent in aeration aquarium which headed drop is made from means slightly smaller than the bubble rise rate.

また、以上の課題を解決するために、請求項４の発明は、閉鎖水域の水面に曝気水槽を浮かべ、水面に浮かぶ曝気水槽の底部に酸素又は空気を気泡として吹き出す散気管を配管し、曝気水槽の一端側に閉鎖水域の底部に下端が開口され底部の貧酸素水の引き上げ水路となる送入管の上端を接続し、散気管が配管された側の底部側に曝気水槽内で曝気された曝気水を底部に送り出す水路となる送出管の上端を接続し、閉鎖水域の底部の貧酸素水を曝気水槽まで引き上げる水流を発生させるプロペラを送出管内の上端側に設け、散気管と送入管の上端が接続開口する流入口との間に越流仕切板を設けて仕切り、越流仕切板で仕切られた曝気水槽内の散気管が配管された側の水面近くに整流板を配置すると共に、送出管の上端が接続開口する流出口に向かって降下する曝気水槽内の水流降下速度を気泡上昇速度よりわずかに小さくした手段よりなるものである。   In order to solve the above-mentioned problems, the invention of claim 4 is characterized in that an aeration tank is floated on the surface of a closed water area, and an aeration pipe for blowing oxygen or air as bubbles at the bottom of the aeration tank floating on the water surface is provided. One end of the aquarium is connected to the bottom of the closed water area and the bottom of the aeration tank is connected to the upper end of the inlet pipe that serves as a drainage channel for the anoxic water at the bottom. A propeller is installed on the upper end side of the delivery pipe to connect the upper end of the delivery pipe that serves as a water channel for sending out the aerated water to the bottom, and generates a water flow that pulls the oxygen-poor water at the bottom of the closed water area up to the aeration tank. Provide an overflow partition plate between the upper end of the pipe and the inlet where the connection opens, and place a flow straightening plate near the water surface on the side where the diffuser pipe in the aeration tank partitioned by the overflow partition plate is piped Along with the outlet, the upper end of the delivery pipe opens The water flow rate of descent in aeration aquarium which headed drop is made from means slightly smaller than the bubble rise rate.

課題を解決するための手段より明らかなように、請求項１〜請求項４の発明に係る閉鎖水域の貧酸素改善装置によれば、従来の方法は、流れ発生方法としては効率のわるい空気に、酸素供給だけでなく流れ発生機能をもたせたことが非効率の原因であったのを、流れの発生をプロペラで行うが、酸素の供給方法と流れの発生方法を分離したことで水流を自由にコントロールできるし、多量の流れを発生できる。
しかも、水圧が小さい水面近くに散気管を設置するため、圧縮空気発生装置でなく、低圧空気を発生する送風機で散気管に空気を供給でき、消費電力を小さくすることができる。プロペラを稼働させるために電力を要するが、送風機とプロペラの使用による方が、従来の圧縮空気発生装置の使用による場合に比べて消費電力をより小さくでき、省エネとなり、ランニングコストを安価にでき経済的である。 As is clear from the means for solving the problems, according to the apparatus for improving oxygen in a closed water area according to the inventions of claims 1 to 4, the conventional method is a method of generating poor air as a flow generation method. In addition to oxygen supply, the inefficiency caused by the flow generation function was caused by the propeller, but the flow of water was separated by separating the oxygen supply method and the flow generation method. Can be controlled and a large amount of flow can be generated.
In addition, since the air diffuser is installed near the water surface where the water pressure is low, air can be supplied to the air diffuser with a blower that generates low-pressure air instead of the compressed air generator, and power consumption can be reduced. Power is required to operate the propeller, but the use of a blower and a propeller can reduce power consumption, save energy, and reduce running costs compared to using a conventional compressed air generator. Is.

また、請求項３及び請求項４の発明にあっては、前記の効果に加えて、曝気水槽内の水流降下速度を気泡上昇速度よりわずかに小さくすることにより、気泡の水中滞在時間を極めて大きくすることができ、これよって、曝気効率を飛躍的に向上させることができる等、極めて新規的有益なる効果を奏するものである。   In addition, in addition to the above-described effects, the water flow descent rate in the aeration tank is slightly smaller than the bubble rise rate, so that the bubble residence time in the water is greatly increased. Thus, a very new beneficial effect such as a dramatic improvement in aeration efficiency can be achieved.

この発明を実施するための形態を示す全体概要図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a whole schematic diagram which shows the form for implementing this invention. この発明を実施するための形態を示す曝気水槽の概要図である。It is a schematic diagram of the aeration tank which shows the form for carrying out this invention. この発明を実施するための形態を示す別の曝気水槽の概要図である。It is a schematic diagram of another aeration tank which shows the form for implementing this invention. この発明を実施するための形態を示す他例の全体概要図である。It is the whole general | schematic diagram of the other example which shows the form for implementing this invention. この発明を実施するための形態を示す他例の曝気水槽の概要図である。It is a schematic diagram of the other aeration water tank which shows the form for implementing this invention. この発明を実施するための形態を示す他例の別の曝気水槽の概要図である。It is a schematic diagram of another aeration tank of the other example which shows the form for implementing this invention. （Ａ）〜（Ｂ）は従来説明図である。(A)-(B) are conventional explanatory drawings. （Ａ）〜（Ｃ）は別の従来説明図である。(A)-(C) are another conventional explanatory drawing.

以下、図面に記載の発明を実施するための形態に基づいて、この発明をより具体的に説明する。
ここで、図１は全体概要図、図２は曝気水槽の概要図、図３は別の曝気水槽の概要図、図４は他例の全体概要図、図５は他例の曝気水槽の概要図、図６は他例の別の曝気水槽の概要図である。 Hereinafter, the present invention will be described more specifically based on embodiments for carrying out the invention described in the drawings.
Here, FIG. 1 is an overview diagram, FIG. 2 is an overview diagram of an aeration tank, FIG. 3 is an overview diagram of another aeration tank, FIG. 4 is an overview diagram of another example, and FIG. 5 is an overview of an aeration tank of another example. FIG. 6 and FIG. 6 are schematic views of another aeration tank according to another example.

図において、貧酸素改善装置１は、例えば、ダム、湖水、人工湖沼や自然湖沼などの閉鎖水域の底部で発生する貧酸素状態を改善する装置で、閉鎖水域の底部の貧酸素改善領域ｂの貧酸素水の引き上げ水路の送入管２、閉鎖水域の底部の貧酸素水を水面近くまで引き上げる水流を発生させるプロペラ３、貧酸素水に曝気を通じて酸素を溶解させる曝気水槽４、曝気水を底部に送り出す水路となる送出管５などから構成されている。   In the figure, an anoxic improvement apparatus 1 is an apparatus for improving an anoxic state occurring at the bottom of a closed water area such as a dam, lake, artificial lake or natural lake, for example, in an anoxic improvement area b at the bottom of the closed water area. The feed pipe 2 for the channel for raising the anoxic water, the propeller 3 for generating the water flow for raising the anoxic water at the bottom of the closed water area to near the water surface, the aeration tank 4 for dissolving oxygen through aeration in the anoxic water, the bottom of the aerated water It is comprised from the delivery pipe | tube 5 etc. which become the water channel sent out to.

貧酸素改善装置１は、送入管２内のプロぺラ３（図１〜図３参照）、或いは送出管５内のプロぺラ３（図４〜図６参照）によって閉鎖水域の底部の貧酸素改善領域ｂの貧酸素水を水面近くまで送入管２を通じて引き上げ、水面近くの曝気水槽４に導き、曝気水槽４内で散気管４１によって曝気を行い、曝気により酸素を含んだ水を再び送出管５で底部に送り込み、送入口２１と送出口５１の間の層の貧酸素改善領域ｂの貧酸素状態を改善するものである。貧酸素改善装置１は図示しない係留索によって、所定水域から移動しないように係留されている。   The anoxic improvement device 1 is provided at the bottom of the closed water area by a propeller 3 (see FIGS. 1 to 3) in the inlet pipe 2 or a propeller 3 in the delivery pipe 5 (see FIGS. 4 to 6). The oxygen-poor water in the oxygen-improving region b is pulled up to the water surface through the inlet pipe 2, led to the aeration tank 4 near the water surface, aerated by the aeration pipe 41 in the aeration water tank 4, and water containing oxygen by aeration The feed pipe 5 is sent again to the bottom, and the poor oxygen state in the poor oxygen improvement region b of the layer between the inlet 21 and the outlet 51 is improved. The poor oxygen improving device 1 is moored by a mooring line (not shown) so as not to move from a predetermined water area.

送入管２は、閉鎖水域の底部の貧酸素改善領域ｂの貧酸素水を水面近くまで引き上げる際の水路となる管で、その下端側は閉鎖水域の底部の所定の深さまで下ろされている。送入管２の下端には送入口２１が開口されており、底部の貧酸素改善領域ｂの貧酸素水はこの送入口２１から送入管２に吸引される。送入管２には、その下端の送入口２１を閉鎖水域の底部の所定の深さまで任意に下ろせるように、例えば蛇腹式管などの伸縮自在な管が使用される。   The feed pipe 2 is a pipe that serves as a water channel when pulling up the anoxic water in the anoxic improvement region b at the bottom of the closed water area to near the water surface, and its lower end is lowered to a predetermined depth at the bottom of the closed water area. . An inlet 21 is opened at the lower end of the inlet pipe 2, and the oxygen-poor water in the poor oxygen improvement region b at the bottom is sucked into the inlet pipe 2 from the inlet 21. For the feed pipe 2, a telescopic pipe such as a bellows pipe is used so that the feed inlet 21 at the lower end can be arbitrarily lowered to a predetermined depth at the bottom of the closed water area.

プロペラ３は、閉鎖水域の底部の貧酸素改善領域ｂの貧酸素水を水面近くまで送入管２を通じて引き上げる水流を発生させるもので、プロペラ３は送入管２の内部の上端の近く（図１〜図３参照）に、或いはプロペラ３は送出管５の内部の上端の近く（図４〜図６参照）に、上下軸回りに回転するように取り付けられている。   The propeller 3 generates a water flow that pulls up the anoxic water in the anoxic improvement region b at the bottom of the closed water area through the inlet pipe 2 near the water surface. The propeller 3 is near the upper end inside the inlet pipe 2 (see FIG. 1 to 3) or the propeller 3 is mounted near the upper end inside the delivery pipe 5 (see FIGS. 4 to 6) so as to rotate about the vertical axis.

プロペラ３の回転によって、送入管２の内部には上向きの流れが発生し、下端の送入口２１から閉鎖水域の底部の貧酸素改善領域ｂの貧酸素水を吸引する。水圧の高い深い底部から貧酸素水を引き上げる場合、プロペラ３は圧縮空気発生装置を使用する場合に比べて消費電力が小さく、省エネを計ることができる。   Due to the rotation of the propeller 3, an upward flow is generated inside the inlet pipe 2, and the anoxic water in the anoxic improvement region b at the bottom of the closed water area is sucked from the inlet 21 at the lower end. When the oxygen-poor water is pulled up from the deep bottom portion where the water pressure is high, the propeller 3 consumes less power than the case where the compressed air generator is used, and can save energy.

プロペラ３は、上下方向に配置されたプロペラ回転軸３１の下端に取り付けられている。プロペラ回転軸３１は曝気水槽４内を上向きに取り付けられていて、プロペラ回転軸３１の上端は曝気水槽４の上部に取り付けられているモーター３２に連動連結されている。モーター３２の駆動によりプロペラ回転軸３１は回転してその下端のプロペラ３を回転させる。   The propeller 3 is attached to the lower end of the propeller rotating shaft 31 arranged in the vertical direction. The propeller rotating shaft 31 is attached upward in the aeration water tank 4, and the upper end of the propeller rotating shaft 31 is linked to a motor 32 attached to the upper part of the aeration water tank 4. The propeller rotating shaft 31 is rotated by driving the motor 32 to rotate the propeller 3 at the lower end thereof.

曝気水槽４は、水面近くまで引き上げられた閉鎖水域の底部の貧酸素改善領域ｂの貧酸素水を曝気して酸素を溶解させて酸素を十分に含んだ水にするための水槽で、曝気水槽４の底部には散気管４１が配管されている。散気管４１には酸素又は空気を吹き出す多数の小孔が形成されている。散気管４１の多数の小孔から吹き出された酸素又は空気は多数の気泡ａとなって曝気水槽４内の水深Ｈの高さを貧酸素水を曝気しながら上昇し、その上昇の過程で酸素又は空気の一部は貧酸素水に溶解して、貧酸素水は酸素を含んだ酸素水に置き換えられる。   The aeration tank 4 is a tank for aeration of the anoxic water in the anoxic improvement region b at the bottom of the closed water area raised to near the surface of the water to dissolve the oxygen into water sufficiently containing oxygen. A diffuser pipe 41 is piped at the bottom of 4. A large number of small holes for blowing out oxygen or air are formed in the air diffuser 41. Oxygen or air blown out from a large number of small holes in the diffuser tube 41 becomes a large number of bubbles a, and the height of the water depth H in the aeration tank 4 rises while aeration of the anoxic water. Alternatively, part of the air is dissolved in the poor oxygen water, and the poor oxygen water is replaced by oxygen water containing oxygen.

散気管４１の上流端はこの散気管４１に酸素又は空気を送り込むための図示しない送風機に接続されている。散気管４１が配管されている部分は水面の近くであり水圧が小さいので、酸素又は空気を送り込んで散気管４１から散気させる場合に大きな圧力を必要としない。このため、従来のように水圧の高い水深のある場所から酸素又は空気を散気させるために高圧気体を送り出すための圧縮空気発生装置を必要とせず、安価な送風機で酸素又は空気を送り込んで散気管４１から散気させることができる。   The upstream end of the air diffuser 41 is connected to a blower (not shown) for sending oxygen or air into the air diffuser 41. The portion where the diffuser pipe 41 is piped is close to the water surface and has a low water pressure. Therefore, when oxygen or air is supplied and diffused from the diffuser pipe 41, a large pressure is not required. For this reason, there is no need for a compressed air generator for sending high-pressure gas in order to diffuse oxygen or air from a place with a high water pressure and a depth of water as in the prior art. Air can be diffused from the trachea 41.

曝気水槽４は、例えば箱形の形状から構成され、４つの側面及び底面が塞がれ、上面は開放されている。曝気水槽４は水面に浮かんでおり、このため、曝気水槽４の外側の側面には、曝気水槽４を水面に浮かす浮体４２が取り付けられている。浮体４２は例えば内部が空洞になっていたり、或いは水より比重の小さな材料で造られている。   The aeration tank 4 is formed in, for example, a box shape, the four side surfaces and the bottom surface are closed, and the upper surface is open. The aeration tank 4 floats on the water surface, and therefore, a floating body 42 that floats the aeration tank 4 on the water surface is attached to the outer side surface of the aeration water tank 4. The floating body 42 is made of a material having a hollow inside or a specific gravity smaller than that of water, for example.

曝気水槽４の底部には散気管４１を挟んでその一端側に、送入管２の上端が接続される流入口４３が開口されている。送入管２を通じて引き上げられた貧酸素改善領域ｂの貧酸素水はこの流入口４３を通じて曝気水槽４内に流入する。   An inflow port 43 to which the upper end of the feed pipe 2 is connected is opened at one end of the aeration water tank 4 with an air diffusion pipe 41 interposed therebetween. The poor oxygen water in the poor oxygen improvement region b pulled up through the inlet pipe 2 flows into the aeration tank 4 through the inlet 43.

図１、図２及び図４、図５にあっては、散気管４１を挟んで流入口４３の反対側の底部には流出口４４が開口されている。この流出口４４には送出管５の上端が接続されていて、曝気された水は流出口４４を通じて送出管５内に排出される。また、図３及び図６にあっては、散気管４１下方の底部に流出口４４が開口されている。   In FIGS. 1, 2, 4, and 5, an outlet 44 is opened at the bottom opposite to the inlet 43 with the air diffuser 41 interposed therebetween. The outlet 44 is connected to the upper end of the delivery pipe 5, and the aerated water is discharged into the delivery pipe 5 through the outlet 44. In FIGS. 3 and 6, an outlet 44 is opened at the bottom below the air diffuser 41.

また、図３及び図６に示す曝気水槽４には、散気管４１と送入管２の上端が接続開口する流入口４３との間には越流仕切板４５が設けられていて、この越流仕切板４５により曝気水槽４内は散気管４１が配管された側と流入口４３とが仕切られている。流入口４３から流入した閉鎖水域の底部の貧酸素改善領域ｂの貧酸素水は、越流仕切板４５を越えて散気管４１が配管された側に流入するようになっている。   In addition, the aeration tank 4 shown in FIGS. 3 and 6 is provided with an overflow partition plate 45 between the air diffusion pipe 41 and the inlet 43 where the upper end of the inlet pipe 2 is connected and opened. In the aeration water tank 4, the side where the air diffusion pipe 41 is piped and the inflow port 43 are partitioned by the flow partition plate 45. The anoxic water in the anoxic improvement region b at the bottom of the closed water area that flows in from the inflow port 43 passes through the overflow partition plate 45 and flows into the side where the air diffusion pipe 41 is piped.

さらに、越流仕切板４５で仕切られた曝気水槽４内の散気管４１が配管された側の水面近くには整流板４６が水平に配置されている。図では整流板４６は散気管４１が配管された側の水面の全面を覆うように配置されている。整流板４６の表面には平面方向に一定の等間隔で複数の小孔の通水孔４６ａが形成されている。   Further, a rectifying plate 46 is horizontally disposed near the water surface on the side where the aeration pipe 41 in the aeration tank 4 partitioned by the overflow partition plate 45 is provided. In the drawing, the rectifying plate 46 is arranged so as to cover the entire surface of the water surface on the side where the air diffusion pipe 41 is piped. A plurality of small water passage holes 46a are formed on the surface of the current plate 46 at regular intervals in the plane direction.

整流板４６は越流仕切板４５を越流して散気管４１側に流入する水流の流速を均一するもので、散気管４１側に流入する閉鎖水域の底部の貧酸素改善領域ｂの貧酸素水は、平面方向に等間隔に形成された整流板４６の各小孔の通水孔４６ａを通過することで、流速が均一になる。整流板４６としては、例えばガイドベーン（案内板）なども用いられる。   The rectifying plate 46 equalizes the flow velocity of the water flow that flows over the overflow partition plate 45 and flows into the diffuser pipe 41, and the anoxic water in the anoxic improvement region b at the bottom of the closed water region that flows into the diffuser pipe 41 side. The flow velocity becomes uniform by passing through the small water passage holes 46a of the rectifying plate 46 formed at equal intervals in the plane direction. As the current plate 46, for example, a guide vane (guide plate) is also used.

さらにまた、散気管４１側に流入した閉鎖水域の底部の貧酸素改善領域ｂの貧酸素水は、曝気水槽４の底部の流出口４４に向かって降下する曝気水槽内の水流降下速度Ｖ０が散気管４１から吹き出す気泡上昇速度Ｖよりわずかに小さくなるように調整されている。この調整はプロペラ３の回転による貧酸素水の流入量を調整することにより行われる。 Furthermore, the anoxic water in the anoxic improvement region b at the bottom of the closed water area that has flowed into the diffuser pipe 41 side has a water flow descent rate V 0 in the aeration tank that descends toward the outlet 44 at the bottom of the aeration tank 4. It is adjusted to be slightly smaller than the bubble rising speed V blown out from the air diffuser 41. This adjustment is performed by adjusting the inflow amount of the oxygen-poor water by the rotation of the propeller 3.

送出管５は、曝気水槽４で曝気されて酸素が溶解した酸素水を閉鎖水域の底部の貧酸素改善領域ｂまで送り出す際の水路となる管で、その下端側は閉鎖水域の底部の所定の深さまで下ろされている。送出管５の下端には送出口５１が開口されており、曝気されて酸素が溶解した酸素水はこの送出口５１から閉鎖水域の底部の貧酸素改善領域ｂに送り出される。送出管５には、その下端の送出口５１を閉鎖水域の底部の所定の深さまで任意に下ろせるように、例えば蛇腹式管などの伸縮自在な管が使用される。   The delivery pipe 5 is a pipe that serves as a water channel for sending oxygen water that has been aerated in the aeration tank 4 and dissolved oxygen to the poor oxygen improvement region b at the bottom of the closed water area, and its lower end is a predetermined part at the bottom of the closed water area. Down to depth. A delivery port 51 is opened at the lower end of the delivery pipe 5, and oxygen water which has been aerated and dissolved oxygen is delivered from the delivery port 51 to the poor oxygen improvement region b at the bottom of the closed water area. For the delivery pipe 5, a telescopic pipe such as a bellows-type pipe is used so that the delivery outlet 51 at the lower end can be arbitrarily lowered to a predetermined depth at the bottom of the closed water area.

次に、上記発明を実施するための形態の構成に基づく作用について以下説明する。
プロペラ３のモーター３２を作動させると、モーター３２に連動連結されているプロペラ回転軸３１は回転し、プロペラ回転軸３１の下端に取り付けられているプロペラ３を軸回りに回転させる。プロペラ３が送入管２内に設けられている場合（図１〜図３参照）にはプロペラ３は送入管２の内部の水を上向きに引き上げる方向に回転して、またプロペラ３が送出管５内に設けられている場合（図４〜図６参照）にはプロペラ３は送出管５の内部の水を下向きに押し出す方向に回転して、送入管２内部には上向きの水流が発生する。 Next, the operation based on the configuration of the embodiment for carrying out the invention will be described below.
When the motor 32 of the propeller 3 is operated, the propeller rotating shaft 31 linked to the motor 32 rotates, and the propeller 3 attached to the lower end of the propeller rotating shaft 31 is rotated about the axis. When the propeller 3 is provided in the feed pipe 2 (see FIGS. 1 to 3), the propeller 3 rotates in the direction of pulling up the water inside the feed pipe 2 and the propeller 3 is sent out. When provided in the pipe 5 (see FIGS. 4 to 6), the propeller 3 rotates in a direction to push the water inside the delivery pipe 5 downward, and an upward water flow is generated inside the feed pipe 2. appear.

プロペラ３によって送入管２内に上向きの水流が発生すると、送入管２の下端の送入口２１は負圧状態となって、閉鎖水域の底部の貧酸素改善領域ｂの貧酸素水は送入口２１に吸引される。吸引された底部の貧酸素水は送入管２内部を上昇し、送入管２の上端から曝気水槽４の流入口４３を通って曝気水槽４内に流入する。   When an upward water flow is generated in the inlet pipe 2 by the propeller 3, the inlet 21 at the lower end of the inlet pipe 2 is in a negative pressure state, and the anoxic water in the anoxic improvement region b at the bottom of the closed water area is fed. Sucked into the inlet 21. The sucked oxygen-poor water at the bottom ascends in the feed pipe 2 and flows into the aeration water tank 4 from the upper end of the feed pipe 2 through the inlet 43 of the aeration water tank 4.

曝気水槽４内では、図示しない送風機を作動させて、散気管４１に低圧で酸素又は空気を送り込む。散気管４１は水面近くにあるので、水圧が低く送風機でも十分に酸素又は空気は送り込まれる。消費電力の小さな送風機が使用できるので、電力コストを安価にすることができる。図示しない送風機の作動により、曝気水槽４の底部に配管された散気管４１の多数の小孔から酸素又は空気が吹き出し、気泡ａとなって曝気水槽４内を上昇しながら曝気水槽４内の貧酸素水を曝気してその一部は貧酸素水に溶解し、貧酸素水を酸素を十分に含んだ酸素水に置き換える。   In the aeration water tank 4, a blower (not shown) is operated to send oxygen or air into the diffuser pipe 41 at a low pressure. Since the air diffuser 41 is near the water surface, the water pressure is low and oxygen or air is sufficiently fed even by a blower. Since a blower with low power consumption can be used, the power cost can be reduced. Owing to the operation of a blower (not shown), oxygen or air is blown out from a large number of small holes in the diffuser pipe 41 piped to the bottom of the aeration tank 4, and the bubbles in the aeration tank 4 rise as bubbles a in the aeration tank 4. Oxygen water is aerated and a part of it is dissolved in the oxygen-poor water, and the oxygen-poor water is replaced with oxygen water sufficiently containing oxygen.

曝気水槽４内では流入口４３から底部の貧酸素改善領域ｂの貧酸素水が流入して水量が増大すると、散気管４１を挟んで流入口４３の反対側に設けられた流出口４４からは流入量に相当する水量が排出される。このため、曝気水槽４内では、流入口４３から流出口４４に向かって流れ生じる。曝気水槽４内では、曝気によって水の比重が少し小さくなるため、外部の水位に比べて少しだけ水位が高くなる。   In the aeration tank 4, when the amount of water increases due to the flow of the anoxic water in the anoxic improvement region b at the bottom from the inlet 43, the outlet 44 provided on the opposite side of the inlet 43 across the air diffusion pipe 41. The amount of water corresponding to the inflow is discharged. For this reason, in the aeration water tank 4, it flows toward the outflow port 44 from the inflow port 43. In the aeration water tank 4, since the specific gravity of water is slightly reduced by aeration, the water level is slightly higher than the external water level.

図１、図２及び図４、図５に示す構成では、流入口４３から流入した底部の貧酸素改善領域ｂの貧酸素水は底部の散気管４１の上を通過しながら流出口４４に向けて移動するが、この間に上述したように散気管４１から発生する気泡ａによって曝気されるのである。このとき、曝気効率（気泡の中の酸素のとけ込む比率）は、気泡が水中に滞在する時間にほぼ比例する。曝気水槽４の水深Ｈ、気泡上昇速度をＶとすると、貧酸素水の水中滞在時間ｔ１＝Ｈ／Ｖとなる。   In the configuration shown in FIGS. 1, 2, 4, and 5, the anoxic water in the bottom anoxic improvement region b flowing in from the inflow port 43 is directed toward the outflow port 44 while passing over the aeration tube 41 at the bottom. During this time, the air is aerated by the bubbles a generated from the air diffuser 41 as described above. At this time, the aeration efficiency (ratio in which oxygen in the bubbles is absorbed) is substantially proportional to the time during which the bubbles stay in the water. If the water depth H of the aeration tank 4 and the bubble rising speed are V, the residence time t1 = H / V of the oxygen-poor water is obtained.

また、図３及び図６に示す構成では、流入口４３から流入した底部の貧酸素改善領域ｂの貧酸素水は、越流仕切板４５を越流して散気管４１が配管された側の水面近くに取り付けられた整流板４６の各通水孔４６ａを通過するが、この各通水孔４６ａを通過する過程で流速の均一化が計られ、均一の流速になって散気管４１が配管された側に流入し、散気管４１の下方の底部に開口された流出口４４に向かって降下する。   3 and FIG. 6, the anoxic water in the anoxic improvement region b at the bottom flowing in from the inlet 43 overflows the overflow partition plate 45 and the water surface on the side where the diffuser pipe 41 is piped. It passes through each water hole 46a of the baffle plate 46 attached nearby, but the flow velocity is made uniform in the process of passing through each water hole 46a, and the air diffusion pipe 41 is piped at a uniform flow velocity. And flows down toward the outlet 44 opened at the bottom of the air diffuser 41.

このとき、前記したように、散気管４１側に流入した閉鎖水域の底部の貧酸素改善領域ｂの貧酸素水は、曝気水槽４の底部の流出口４４に向かって、曝気水槽４の水深Ｈを降下する曝気水槽内の水流降下速度Ｖ０が散気管４１から吹き出す気泡上昇速度Ｖよりわずかに小さくなるように調整されている。 At this time, as described above, the anoxic water in the anoxic improvement region b at the bottom of the closed water area that has flowed into the diffuser pipe 41 side is directed toward the outlet 44 at the bottom of the aeration tank 4, and the depth H of the aeration tank 4. The water flow descending speed V 0 in the aeration tank descending the air is adjusted to be slightly smaller than the bubble rising speed V blown out from the air diffuser 41.

このため、図１、図２及び図４、図５の構成の場合に比べて図３及び図６の構成では、曝気水槽４の散気管４１側での貧酸素水の水中滞在時間ｔ２＝Ｈ／（Ｖ−Ｖ０）となり長くなる。特に水流降下速度Ｖ０を気泡上昇速度Ｖよりわずかに小さくすると、貧酸素水の水中滞在時間ｔ２は極めて大きな値となり、曝気効率は飛躍的に向上する。 For this reason, in the structure of FIG.3 and FIG.6 compared with the case of the structure of FIG.1, FIG.2 and FIG.4, FIG.5, the dwell time t2 = H of the anoxic water in the diffuser pipe 41 side of the aeration water tank 4 / (V−V 0 ) and becomes longer. In particular, when a water flow rate of descent V 0 slightly smaller than the bubble rising velocity V, water residence time t2 of hypoxic water becomes a very large value, the aeration efficiency is greatly improved.

因みに、気泡上昇速度Ｖを、０．３ｍ／秒とし、水流降下速度Ｖ０を０．４ｍ／秒、水深Ｈを２．０ｍとすると、貧酸素水の水中滞在時間ｔ１は約７秒に対し、水中滞在時間ｔ２は２０秒になり、約３倍の曝気効率になる。 Incidentally, if the bubble rising speed V is 0.3 m / second, the water flow descending speed V 0 is 0.4 m / second, and the water depth H is 2.0 m, the dwell time t1 of the anoxic water is about 7 seconds. The underwater residence time t2 is 20 seconds, and the aeration efficiency is about three times.

酸素水に置き換えられた水は流出口４４から送出管５内に排出され、送出管５内を降下してその下端に開口された送出口５１から閉鎖水域の底部に送り出されて、底部の貧酸素改善領域ｂの貧酸素水を徐々に酸素水に置き換えて、閉鎖水域の底部の貧酸素改善領域ｂの水質改善を計ることが可能となる。   The water replaced with oxygen water is discharged from the outlet 44 into the delivery pipe 5, descends through the delivery pipe 5, and is sent to the bottom of the closed water area from the delivery outlet 51 opened at the lower end thereof. It is possible to gradually improve the water quality of the poor oxygen improvement region b at the bottom of the closed water region by gradually replacing the poor oxygen water in the oxygen improvement region b with oxygen water.

なお、この発明は上記発明を実施するための形態に限定されるものではなく、この発明の精神を逸脱しない範囲で種々の改変をなし得ることは勿論である。   The present invention is not limited to the embodiment for carrying out the invention, and it goes without saying that various modifications can be made without departing from the spirit of the invention.

１ 貧酸素改善装置
２ 送入管
２１ 送入口
３ プロペラ
３１ プロペラ回転軸
３２ モーター
４ 曝気水槽
４１ 散気管
４２ 浮体
４３ 流入口
４４ 流出口
４５ 越流仕切板
４６ 整流板
４６ａ 通水孔
５ 送出管
５１ 送出口
ａ 気泡
ｂ 貧酸素改善領域
Ｈ 曝気水槽の水深
Ｖ０ 水流降下速度
Ｖ 気泡上昇速度
９１ 送水管
９２ プロペラ
９３ 散気管
９４ 気泡抜き DESCRIPTION OF SYMBOLS 1 Poor oxygen improvement apparatus 2 Inlet pipe 21 Inlet 3 Propeller 31 Propeller rotating shaft 32 Motor 4 Aeration water tank 41 Aeration pipe 42 Floating body 43 Inlet 44 Outlet 45 Overflow partition plate 46 Rectifier 46a Water hole 5 Outlet pipe 51 Outlet a Bubble b Poor oxygen improvement area H Depth of aeration tank V 0 Water flow drop speed V Bubble rise speed 91 Water pipe 92 Propeller 93 Air diffuser 94 Bubble removal

Claims (4)

閉鎖水域の水面に曝気水槽を浮かべ、水面に浮かぶ曝気水槽の底部に酸素又は空気を気泡として吹き出す散気管を配管し、散気管を挟んでその両端側に、閉鎖水域の底部に下端が開口され底部の貧酸素水の引き上げ水路となる送入管の上端と、曝気水槽内で曝気された曝気水を底部に送り出す水路となる送出管の上端とをそれぞれ接続し、閉鎖水域の底部の貧酸素水を曝気水槽まで引き上げる水流を発生させるプロペラを送入管内の上端側に設けたことを特徴とする閉鎖水域の貧酸素改善装置。 An aeration tank is floated on the surface of the closed water area, and an aeration pipe that blows out oxygen or air as bubbles is installed at the bottom of the aeration tank floating on the water surface.The lower end is opened at the bottom of the closed water area on both ends of the aeration pipe. Connect the upper end of the inlet pipe that becomes the channel for raising the anoxic water at the bottom and the upper end of the outlet pipe that becomes the channel for sending the aerated water aerated in the aeration tank to the bottom. An apparatus for improving anoxicities in a closed water area, wherein a propeller for generating a water flow for raising water to an aeration tank is provided on an upper end side in an inlet pipe. 閉鎖水域の水面に曝気水槽を浮かべ、水面に浮かぶ曝気水槽の底部に酸素又は空気を気泡として吹き出す散気管を配管し、散気管を挟んでその両端側に、閉鎖水域の底部に下端が開口され底部の貧酸素水の引き上げ水路となる送入管の上端と、曝気水槽内で曝気された曝気水を底部に送り出す水路となる送出管の上端とをそれぞれ接続し、閉鎖水域の底部の貧酸素水を曝気水槽まで引き上げる水流を発生させるプロペラを送出管内の上端側に設けたことを特徴とする閉鎖水域の貧酸素改善装置。 An aeration tank is floated on the surface of the closed water area, and an aeration pipe that blows out oxygen or air as bubbles is installed at the bottom of the aeration tank floating on the water surface.The lower end is opened at the bottom of the closed water area on both ends of the aeration pipe. Connect the upper end of the inlet pipe that becomes the channel for raising the anoxic water at the bottom and the upper end of the outlet pipe that becomes the channel for sending the aerated water aerated in the aeration tank to the bottom. An apparatus for improving poor oxygen in a closed water area, wherein a propeller for generating a water flow for raising water to an aeration tank is provided on an upper end side in a delivery pipe. 閉鎖水域の水面に曝気水槽を浮かべ、水面に浮かぶ曝気水槽の底部に酸素又は空気を気泡として吹き出す散気管を配管し、曝気水槽の一端側に閉鎖水域の底部に下端が開口され底部の貧酸素水の引き上げ水路となる送入管の上端を接続し、散気管が配管された側の底部側に曝気水槽内で曝気された曝気水を底部に送り出す水路となる送出管の上端を接続し、閉鎖水域の底部の貧酸素水を曝気水槽まで引き上げる水流を発生させるプロペラを送入管内の上端側に設け、散気管と送入管の上端が接続開口する流入口との間に越流仕切板を設けて仕切り、越流仕切板で仕切られた曝気水槽内の散気管が配管された側の水面近くに整流板を配置すると共に、送出管の上端が接続開口する流出口に向かって降下する曝気水槽内の水流降下速度を気泡上昇速度よりわずかに小さくしたことを特徴とする閉鎖水域の貧酸素改善装置。 An aeration tank is floated on the surface of the closed water area, an aeration pipe that blows out oxygen or air as bubbles at the bottom of the aeration tank floating on the water surface is piped, and the lower end is opened at the bottom of the closed water area at one end of the aeration tank, and the bottom is anoxic Connect the upper end of the feed pipe that becomes the water pulling water channel, connect the upper end of the feed pipe that becomes the water channel that sends out the aerated water aerated in the aeration tank to the bottom side of the side where the diffuser pipe is piped, A propeller that generates a water flow that raises the oxygen-poor water at the bottom of the closed water area to the aeration tank is provided on the upper end side of the inlet pipe, and the overflow partition plate is located between the air diffuser pipe and the inlet opening that connects the upper end of the inlet pipe A baffle plate is arranged near the water surface on the side where the diffuser pipe in the aeration tank partitioned by the overflow partition plate is installed, and the upper end of the delivery pipe descends toward the outlet opening that opens the connection Bubble rise in water flow descent rate in aeration tank Hypoxia improving apparatus of the closing body of water, characterized in that slightly less than degrees. 閉鎖水域の水面に曝気水槽を浮かべ、水面に浮かぶ曝気水槽の底部に酸素又は空気を気泡として吹き出す散気管を配管し、曝気水槽の一端側に閉鎖水域の底部に下端が開口され底部の貧酸素水の引き上げ水路となる送入管の上端を接続し、散気管が配管された側の底部側に曝気水槽内で曝気された曝気水を底部に送り出す水路となる送出管の上端を接続し、閉鎖水域の底部の貧酸素水を曝気水槽まで引き上げる水流を発生させるプロペラを送出管内の上端側に設け、散気管と送入管の上端が接続開口する流入口との間に越流仕切板を設けて仕切り、越流仕切板で仕切られた曝気水槽内の散気管が配管された側の水面近くに整流板を配置すると共に、送出管の上端が接続開口する流出口に向かって降下する曝気水槽内の水流降下速度を気泡上昇速度よりわずかに小さくしたことを特徴とする閉鎖水域の貧酸素改善装置。 An aeration tank is floated on the surface of the closed water area, an aeration pipe that blows out oxygen or air as bubbles at the bottom of the aeration tank floating on the water surface is piped, and the lower end is opened at the bottom of the closed water area at one end of the aeration tank, and the bottom is anoxic Connect the upper end of the feed pipe that becomes the water pulling water channel, connect the upper end of the feed pipe that becomes the water channel that sends out the aerated water aerated in the aeration tank to the bottom side of the side where the diffuser pipe is piped, A propeller that generates a water flow that raises the oxygen-poor water at the bottom of the closed water area to the aeration tank is installed on the upper end side of the delivery pipe, and an overflow partition plate is installed between the diffuser pipe and the inlet opening that connects the upper end of the feed pipe. An aeration plate that is installed and partitioned and a rectifying plate is placed near the water surface on the side where the diffuser pipe in the aeration tank divided by the overflow partition plate is installed, and the upper end of the delivery pipe descends toward the outlet opening Bubble rise in water flow descent speed in aquarium Hypoxia improving apparatus of the closing body of water, characterized in that slightly less than degrees.
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CN102241442A (en) * 2010-05-13 2011-11-16 佘伟强 Air-blast water oxygenation device
CN103030219A (en) * 2012-12-25 2013-04-10 浙江海洋学院 Modularized buttress for urban water system
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