JPH0515894A - Deep aeration tank - Google Patents
Deep aeration tankInfo
- Publication number
- JPH0515894A JPH0515894A JP3295278A JP29527891A JPH0515894A JP H0515894 A JPH0515894 A JP H0515894A JP 3295278 A JP3295278 A JP 3295278A JP 29527891 A JP29527891 A JP 29527891A JP H0515894 A JPH0515894 A JP H0515894A
- Authority
- JP
- Japan
- Prior art keywords
- circulation device
- aeration tank
- fluid
- outer cylinder
- inner cylinder
- 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
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、汚水を好気性バクテリ
アにより浄化処理する曝気槽に関するものであって、縦
長円筒状の外形を有するものの処理効率の向上を図るも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aeration tank for purifying sewage with aerobic bacteria to improve the treatment efficiency of a vertically long cylindrical outer shape.
【0002】[0002]
【従来の技術】汚水を好気性バクテリアにより生物学的
に浄化処理するための曝気槽として、縦長円筒状の外形
を有するものが、従来、実開昭58−100097号公
報や特開昭63−175692号公報などに提案されて
いる。2. Description of the Related Art As an aeration tank for biologically purifying sewage with aerobic bacteria, an aeration tank having a vertically long cylindrical shape has hitherto been disclosed in Japanese Utility Model Laid-Open No. Sho 58-100097 and Japanese Patent Laid-Open No. Sho 63-63. It is proposed in Japanese Patent No. 175692.
【0003】縦長円筒状の曝気槽は、一定容積を確保す
るのに必要な設置面積が少なくて済むという利点のほ
か、槽内底部では水圧が高くなるため酸素の溶解度が大
きく、好気性バクテリアの活性が向上するという利点を
有している。The vertically long cylindrical aeration tank has the advantage that the installation area required to secure a constant volume is small, and since the water pressure is high at the bottom of the tank, the solubility of oxygen is large and aerobic bacteria are absent. It has the advantage of improved activity.
【0004】ところで、曝気槽の処理能力は、充分な酸
素の存在下において汚水と好気性バクテリアとが接触し
ている時間が長いほど大きくなる。そこで前記従来例で
は、槽内に螺旋状の隔壁を形成して汚水及び空気の流動
径路を延長し、もって両者の接触時間を長くすることに
より、処理効率の向上を図っている。By the way, the treatment capacity of the aeration tank increases as the time during which sewage and aerobic bacteria are in contact with each other in the presence of sufficient oxygen increases. In view of this, in the above-mentioned conventional example, a spiral partition wall is formed to extend the flow paths of the sewage and the air, and the contact time between the two is lengthened to improve the treatment efficiency.
【0005】[0005]
【発明が解決しようとする課題】前記従来技術は、曝気
槽内に螺旋状の隔壁を形成することにより汚水及び空気
の流路を延長しているため、螺旋状の隔壁の下面に空気
が貯溜し易く、汚水中への酸素供給量が減少するという
問題があった。貯溜した空気は、集合してその容積が増
すほど比表面積が低下し、汚水への酸素供給効率を悪く
する。その結果、所要の処理能力を得るために必要な曝
気量が増加し、設備の大型化や運転経費の上昇など種々
の問題を招来する。しかも、この問題点は、高さ寸法が
7m以上のいわゆる深層曝気槽でより顕著になる。In the prior art described above, the spiral partition wall is formed in the aeration tank to extend the flow paths of sewage and air, so that air is stored on the lower surface of the spiral partition wall. However, there is a problem that the amount of oxygen supplied to the wastewater is reduced. The accumulated air has a specific surface area that decreases as the volume of the collected air increases, thereby deteriorating the efficiency of oxygen supply to wastewater. As a result, the amount of aeration required to obtain the required processing capacity increases, which causes various problems such as an increase in the size of equipment and an increase in operating costs. Moreover, this problem becomes more remarkable in a so-called deep aeration tank having a height dimension of 7 m or more.
【0006】[0006]
【課題を解決するための手段】本発明は、上記欠点を解
決するべく創案された深層曝気槽である。その特徴とす
るところは、汚水の供給部及び処理水の流出部を備えた
縦長筒状の曝気槽であって、当該曝気槽内の流体を吸引
してこれを曝気槽内の下部へ噴出するための下位循環装
置が設けられると共に、当該曝気槽内の流体を吸引して
これを前記下位循環装置の噴出部よりも上方において曝
気槽内へ噴出するための上位循環装置が設けられ、前記
上位循環装置及び下位循環装置は、配管,ポンプ及びこ
のポンプの吐出側において空気を流体中へ混入させるエ
ジェクター機構より構成され、前記上位循環装置及び下
位循環装置それぞれの噴出方向は流体を槽内で旋回流動
させ得る方向に設定されていることである。The present invention is a deep aeration tank designed to solve the above-mentioned drawbacks. The feature is a vertically elongated aeration tank equipped with a waste water supply part and a treated water outflow part, which sucks the fluid in the aeration tank and ejects it to the lower part in the aeration tank. And a higher-level circulation device for sucking the fluid in the aeration tank and ejecting the fluid into the aeration tank above the ejection part of the lower-level circulation device. The circulation device and the lower circulation device are composed of a pipe, a pump, and an ejector mechanism that mixes air into the fluid on the discharge side of the pump. The jetting direction of each of the upper circulation device and the lower circulation device swirls the fluid in the tank. That is, it is set so that it can flow.
【0007】また本発明のより好ましい態様は、曝気槽
を汚水の供給部及び処理水の流出部を備えた外筒と該外
筒と同心的に配置され上部に流入開口を有する内筒とよ
り構成し、前記内筒の流入開口は前記外筒の流出部より
も下方に位置せしめ、前記内筒内の流体を吸引してこれ
を前記外筒と内筒との間へ噴出するための下位循環装置
を設けると共に、当該曝気槽内の流体を吸引してこれを
前記下位循環装置の噴出部よりも上方において前記外筒
と内筒との間へ噴出するための上位循環装置を設け、前
記上位循環装置及び下位循環装置それぞれの噴出方向を
流体を前記外筒と内筒との間で旋回流動させ得る方向に
設定することである。[0007] A more preferable aspect of the present invention is that the aeration tank is composed of an outer cylinder provided with a waste water supply part and a treated water outflow part, and an inner cylinder concentrically arranged with the outer cylinder and having an inflow opening in the upper part. A lower part for sucking the fluid in the inner cylinder and ejecting the fluid into the space between the outer cylinder and the inner cylinder. A circulation device is provided, and an upper circulation device for sucking the fluid in the aeration tank and ejecting the fluid between the outer cylinder and the inner cylinder above the ejection portion of the lower circulation device is provided. That is, the jetting directions of the upper circulation device and the lower circulation device are set so that the fluid can swirl between the outer cylinder and the inner cylinder.
【0008】さらに、曝気槽の高さ寸法が大きい場合に
は、前記の上位循環装置と下位循環装置に加え、前記上
位循環装置と下位循環装置それぞれの噴出部の中間位置
において流体を槽内へ噴出する中位循環装置を設ければ
よい。Further, when the height dimension of the aeration tank is large, in addition to the upper circulation device and the lower circulation device, fluid is introduced into the tank at an intermediate position between the ejection parts of the upper circulation device and the lower circulation device. It suffices to provide a medium-level circulating device for ejecting.
【0009】なお上記中位循環装置は、曝気槽の高さ寸
法に応じ、その設置個数を適宜増加させることが可能で
ある。Incidentally, the number of the intermediate circulation devices can be appropriately increased according to the height dimension of the aeration tank.
【0010】[0010]
【作用】本発明に係る深層曝気槽は、上位及び下位の循
環装置により曝気槽内の汚水を吸引したのち、これを、
汚水が槽内を旋回流動し得る方向に噴出させることによ
り、槽内の汚水に流動力を付与し、旋回流動を生起せし
める。旋回流動は、曝気槽の下部から上方へしだいに伝
播していく。In the deep aeration tank according to the present invention, the sewage in the aeration tank is sucked by the upper and lower circulation devices, and then the
By ejecting sewage in a direction in which it can swirl in the tank, a flow force is given to the sewage in the tank to cause swirling flow. The swirling flow gradually propagates upward from the lower part of the aeration tank.
【0011】ところで、曝気槽の高さ寸法が大きい場
合、循環装置が下部のみにしか設置されていないとすれ
ば、汚水に付与された流動力は最上部に達する途中で減
衰し、槽内全部の汚水を所要速度以上で旋回流動させる
ことが困難である。一般に、流速が20cm/秒未満で
は、汚泥が沈降してしまうと言われている。そこで、本
発明にあっては、曝気槽の下部に設置した下位循環装置
の上方に、上位循環装置を設け、この上位循環装置によ
り、曝気槽の中間高さ位置で汚水に改めて流動力を付与
するようにしたので、所要速度以上の流速の旋回流動を
槽内全体に渡り確実に生じさせることができる。By the way, when the height of the aeration tank is large, if the circulation device is installed only in the lower part, the flow force applied to the sewage is attenuated on the way to reach the uppermost part, and the entire inside of the tank is attenuated. It is difficult to swirl the sewage at a speed higher than the required speed. It is generally said that sludge will settle if the flow velocity is less than 20 cm / sec. Therefore, in the present invention, an upper circulation device is provided above the lower circulation device installed in the lower part of the aeration tank, and this upper circulation device gives a new flow force to the wastewater at the intermediate height position of the aeration tank. Since this is done, it is possible to reliably generate a swirling flow having a flow velocity higher than the required velocity throughout the tank.
【0012】なお、曝気槽の高さ寸法が極めて大きく、
上位循環装置と下位循環装置だけでは汚水に十分な流速
を与えることができない場合には、両者の中間位置に中
位循環装置を1又は複数個設けることにより、所要速度
以上の流速の旋回流動を確実に生じさせることができ
る。The height of the aeration tank is extremely large,
If the upper circulation device and the lower circulation device alone cannot provide a sufficient flow velocity to the sewage, by providing one or more intermediate circulation devices at the intermediate position between the two, swirling flow with a flow velocity higher than the required velocity can be achieved. It can be reliably generated.
【0013】前記の上位循環装置及び下位循環装置並び
に必要に応じ設けられる中位循環装置それぞれには、ポ
ンプの吐出側に、汚水中へ空気を混入させるエジェクタ
ー機構が設けられているので、噴出流は多量の空気を泡
沫状に含んだ状態となる。各循環装置から汚水と共に噴
出された泡沫状の空気は、上述のようにして生じた旋回
流動に追従して徐々に、しかし停溜することなく上方へ
移動する。このため空気と汚水との接触時間が非常に長
い。また下位循環装置の噴出部は、水圧の大きい曝気槽
の下部に位置している。それ故、噴出空気の気泡径が極
めて小さくなるから、汚水との接触率が大きくなる。依
って、供給した空気中の酸素を汚水中へ効率良く溶解さ
せることが可能であり、曝気量を必要最小限で済ませる
ことができる。Each of the upper circulation device, the lower circulation device, and the middle circulation device provided as necessary has an ejector mechanism for mixing air into the waste water on the discharge side of the pump. Is a state that contains a large amount of air in the form of foam. The foamy air ejected together with the sewage from each circulation device gradually moves upward following the swirling flow generated as described above, but without stopping. Therefore, the contact time between air and waste water is very long. In addition, the jet part of the lower circulation device is located at the bottom of the aeration tank with high water pressure. Therefore, since the bubble diameter of the jetted air is extremely small, the contact rate with the dirty water is large. Therefore, the oxygen in the supplied air can be efficiently dissolved in the waste water, and the aeration amount can be minimized.
【0014】さらに、噴出された気泡は、旋回しつつ曝
気槽の底部から上部まで隈無く行き渡るので、槽内にお
ける溶存酸素の分布状態が一様となり、酸素不足の領域
を生じさせるおそれがない。Furthermore, since the ejected bubbles swirl and spread from the bottom to the top of the aeration tank, the dissolved oxygen is uniformly distributed in the tank, and there is no possibility of causing an oxygen deficiency region.
【0015】なお、本発明の好ましい態様として、曝気
槽を外筒と内筒とからなる二重構造とすると共に、下位
循環装置によって内筒内の汚水を吸引する構成を採用し
た場合、外筒と内筒との間では汚水の旋回流動が生じ、
内筒内では汚水の吸引による下降流が発生する。そし
て、旋回流動と下降流とは、内筒によって相互干渉しな
いよう明確に区分されているから、槽内全域にわたる旋
回流動がより効率良く生成し、その結果、気泡分布の一
様化が一層確実になる。In a preferred embodiment of the present invention, when the aeration tank has a double structure consisting of an outer cylinder and an inner cylinder and a lower circulation device is used to suck the dirty water in the inner cylinder, the outer cylinder is used. Swirling flow of wastewater between the inner cylinder and
A downward flow occurs due to the suction of dirty water in the inner cylinder. The swirling flow and the downward flow are clearly separated by the inner cylinder so that they do not interfere with each other, so that the swirling flow over the entire area of the tank is generated more efficiently, and as a result, the bubble distribution is more uniform. become.
【0016】[0016]
【実施例】以下、本発明の詳細を、実施例を示す図面に
基づいて説明する。図1に、本発明に係る深層曝気槽P
の一例を示す。この曝気槽Pは、同心的に配された外筒
1と内筒2とから成る。外筒1の上部には処理水の流出
部3が設けられ、内筒2内の上部には汚水供給管5及び
処理水と一緒に流出した活性汚泥の一部を返送する汚泥
返送管6が備えられている。外筒1の内面上方には阻流
堰4が設けられ、この阻流堰4の上端を乗り越えた処理
水を上記流出部3から外部へ流出させるようになされて
いる。また、汚水と返送汚泥とを内筒2内へ直接供給す
るようにしたのは、汚水活性汚泥との接触を容易にし
て、活性汚泥中の微生物が汚水中の基質を取り込む初期
吸着を促進することにより、生物反応を良好にするため
である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings showing the embodiments. FIG. 1 shows a deep aeration tank P according to the present invention.
An example is shown. The aeration tank P includes an outer cylinder 1 and an inner cylinder 2 which are concentrically arranged. A treated water outflow portion 3 is provided on the upper part of the outer cylinder 1, and a sludge supply pipe 5 and a sludge return pipe 6 for returning a part of the activated sludge that has flowed out together with the treated water are provided on the upper part of the inner cylinder 2. It is equipped. A diversion weir 4 is provided above the inner surface of the outer cylinder 1, and the treated water that has passed over the upper end of the diversion weir 4 is caused to flow out from the outflow portion 3 to the outside. Further, the sewage and the returned sludge are directly supplied into the inner cylinder 2 by facilitating the contact with the sewage activated sludge and promoting the initial adsorption by which the microorganisms in the activated sludge take in the substrate in the sewage. This is to improve the biological reaction.
【0017】外筒1の外形寸法は、汚水の処理量に応じ
て適宜設定される。他方、内筒2は、その直径が余り大
きいと、汚水の処理領域が縮小するのみならず、汚水の
旋回流動に対する抵抗として作用するので、外筒1の直
径の1/4以下、望ましくは1/5以下に設定する。し
かし、必要以上に内筒2の直径を小さくすると、筒内の
流通抵抗となると共に、活性汚泥のブリッジが生成し易
くなるので、内筒2は少なくとも300mm以上の直径
を有することが望ましい。The outer dimensions of the outer cylinder 1 are appropriately set according to the amount of sewage treated. On the other hand, if the diameter of the inner cylinder 2 is too large, not only does the treated area of the wastewater shrink, but it also acts as a resistance to the swirling flow of the wastewater, so it is 1/4 or less of the diameter of the outer cylinder 1, preferably 1 Set it to / 5 or less. However, if the diameter of the inner cylinder 2 is made smaller than necessary, the flow resistance in the cylinder is increased and the bridge of activated sludge is easily generated. Therefore, it is desirable that the inner cylinder 2 has a diameter of at least 300 mm or more.
【0018】内筒2は、曝気槽Pの底部1aから立設さ
れ、その上部の流入開口2aは、外筒1の流出部3より
も下方に位置している。つまり、汚水の貯溜水位より
も、内筒2の流入開口2aが下方となるように設定され
ていればよく、水面からの距離については特に制約はな
い。また内筒2の高さ寸法については、曝気槽Pの底部
で噴出させた汚水が曝気処理されずに内筒2内へ短絡的
に流入するのを防止するため、1m以上を有することが
望ましい。The inner cylinder 2 is erected from the bottom portion 1a of the aeration tank P, and the inflow opening 2a at the upper portion thereof is located below the outflow portion 3 of the outer cylinder 1. That is, it is sufficient that the inflow opening 2a of the inner cylinder 2 is set to be lower than the stored water level of the dirty water, and the distance from the water surface is not particularly limited. Further, the height of the inner cylinder 2 is preferably 1 m or more in order to prevent sewage ejected from the bottom of the aeration tank P from flowing into the inner cylinder 2 in a short circuit without being aerated. .
【0019】槽底部1a近傍には、一端の吸引部10a
が内筒2に接続され、内筒2内の汚水を吸引して、これ
を外筒1と内筒2との間に配置した噴出部10bから噴
出させる下位循環装置10が設けられている。また下位
循環装置10の上方には、槽上部に配した吸引部20a
から汚水を吸引して、これを下位循環装置の噴出部10
bよりも上方で噴出部20bから外筒1と内筒2の間へ
噴出する上位循環装置20が設けられている。これらの
循環装置10,20は、いずれも配管12,22と、こ
れら配管12,22の途中に設けられたポンプ11,2
1と、各ポンプ11,21の吐出側に設けられ通気管1
5を通じて取り入れた空気を汚水へ混入するためのエジ
ェクター機構13とから成っている。A suction part 10a at one end is provided near the bottom 1a of the tank.
Is connected to the inner cylinder 2, and a lower circulation device 10 for sucking the dirty water in the inner cylinder 2 and ejecting the dirty water from an ejecting portion 10b arranged between the outer cylinder 1 and the inner cylinder 2 is provided. In addition, above the lower circulation device 10, a suction unit 20a arranged above the tank is provided.
Sewage is sucked from the sewage, and the sewage is sucked from the lower circulation device 10
An upper circulation device 20 for ejecting from the ejection portion 20b between the outer cylinder 1 and the inner cylinder 2 is provided above b. Each of these circulation devices 10 and 20 includes pipes 12 and 22, and pumps 11 and 2 provided in the middle of the pipes 12 and 22.
1 and a ventilation pipe 1 provided on the discharge side of each pump 11, 21.
5 and an ejector mechanism 13 for mixing the air taken in through 5 into the sewage.
【0020】上記エジェクター機構13は、本出願人の
先の出願に係る特願平2−159464号(平成2年6
月18日出願)に開示したエジェクター機構を利用した
ものであって、図2に示すような内部構造を及び機能を
有する。すなわち、ポンプ11の吐出側の配管12(2
2)に接続されたケーシング13aの内部に、流出側へ
向かって管径が縮小する縮流部14が形成されると共
に、ケーシング13aには、外気と連通する通気管15
及び曝気槽Pと連絡しケーシング13a内へ汚水を直接
導入する副流入管16が設けられている。配管12(2
2)から送給された汚水は、縮流部14で高速化される
ことによりその周囲に負圧を発生させ、該負圧を利用し
て通気管15から外部の空気を吸入して汚水中へ混入さ
せると同時に、副流入管16を通じて槽内の汚水を直接
ケーシング13a内へ導入する。これにより、汚水は、
ケーシング13a内で激しく攪拌され噴霧化された状態
で曝気槽P内へ噴出される。その結果、非常に大きい吸
引空気量及び酸素溶解量が得られる。The ejector mechanism 13 is the same as the Japanese Patent Application No. 2-159464 (1994, 6), which was filed by the present applicant.
The application is based on the ejector mechanism disclosed in U.S.A. 18th) and has an internal structure and functions as shown in FIG. That is, the pipe 12 (2 on the discharge side of the pump 11
The inside of the casing 13a connected to 2) is formed with a contracted flow portion 14 whose pipe diameter decreases toward the outflow side, and the casing 13a has a ventilation pipe 15 communicating with the outside air.
Also, a sub-inflow pipe 16 is provided which communicates with the aeration tank P and directly introduces the waste water into the casing 13a. Pipe 12 (2
The sewage fed from 2) is accelerated in the contracting section 14 to generate a negative pressure around the sewage, and the negative pressure is used to suck the outside air from the ventilation pipe 15 to collect the sewage. At the same time, the waste water in the tank is directly introduced into the casing 13a through the auxiliary inflow pipe 16. With this, the sewage is
It is jetted into the aeration tank P in a state of being vigorously stirred and atomized in the casing 13a. As a result, a very large intake air amount and oxygen dissolution amount can be obtained.
【0021】本実施例では、図3及び図4に示す如く、
下位循環装置10及び上位循環装置20それぞれの噴出
部10b,20bの噴出方向を、汚水の流動効果が大き
くなるよう、いずれもほぼ水平で且つ上記噴出部10
b,20bを通る外筒の半径rに対してほぼ垂直となる
ように設定した。上位循環装置20の吸引部20aにつ
いては、図4に示す如く、汚水の吸い込み方向が平面視
して噴出部20bの噴出方向と外筒の中心軸に対称な位
置となるように設け、吸引力を汚水の旋回流動に利用し
得るようにした。けれども、これらの設定は限定的なも
のではなく、汚水を旋回流動させ得るものであれば、噴
出方向を水平に対し上下に傾斜させても、また半径rに
対して内外方向に傾斜させても差し支えない。さらに、
噴出部10b,20bの配置は、流動効率の面から見
て、外筒1寄りとするのが一般的と思われるが、実施の
状況に応じて適宜変更することを妨げるものではない。
なお本実施例では、下位循環装置10の噴出部10bを
底部1aの近傍に設けることとしたが、実施条件によっ
ては、底部1aからやや離隔させて設置してもよい。In this embodiment, as shown in FIGS.
The jetting directions of the jetting portions 10b and 20b of the lower circulation device 10 and the upper circulation device 20 are both substantially horizontal so that the flow effect of the sewage is large, and the jetting portion 10 is the same.
It was set to be substantially perpendicular to the radius r of the outer cylinder passing through b and 20b. As shown in FIG. 4, the suction part 20a of the upper circulation device 20 is provided such that the suction direction of the dirty water is in a position symmetrical with the spouting direction of the spouting part 20b in plan view and the central axis of the outer cylinder. Was made available for swirling flow of wastewater. However, these settings are not limited, and as long as the sewage can be swirled and flown, the jetting direction may be tilted vertically with respect to the horizontal, or may be tilted inward and outward with respect to the radius r. It doesn't matter. further,
It is generally considered that the ejection portions 10b and 20b are arranged closer to the outer cylinder 1 from the viewpoint of flow efficiency, but it does not prevent appropriate changes depending on the implementation situation.
In the present embodiment, the ejection part 10b of the lower circulation device 10 is provided near the bottom part 1a, but it may be installed slightly apart from the bottom part 1a depending on the implementation conditions.
【0022】上述のような構成された本発明に係る深層
曝気槽Pに汚水を貯溜し、各循環装置10,20を始動
させると、下位循環装置10によって内筒2内の汚水が
ポンプ11により吸引されたのち、外筒1と内筒2との
中間よりも外筒1寄りの位置でほぼ水平に且つ噴出部1
0bを通る外筒の半径rに対しほぼ垂直に噴出される。
また、上位循環装置20によって吸引部20aから吸引
された槽P上部の汚水は、中間高さ位置で外筒1と内筒
2との中間よりも外筒1寄りの位置でほぼ水平に且つ噴
出部20bを通る外筒の半径rに対しほぼ垂直に噴出さ
れる。これらと同時に、内筒2内では汚水の下降流動が
生起する。依って、汚水の循環が開始すると共に、槽底
部及び中間高さ位置それぞれで流動力が汚水に付与され
るから、曝気槽Pの高さ寸法が大きい場合でも、槽内全
域にわたり、所要速度以上の旋回流動が確実に発生す
る。When sewage is stored in the deep aeration tank P according to the present invention having the above-mentioned structure and each circulation device 10, 20 is started, the sewage in the inner cylinder 2 is pumped by the pump 11 by the lower circulation device 10. After being sucked, it is almost horizontal at a position closer to the outer cylinder 1 than the middle between the outer cylinder 1 and the inner cylinder 2 and the ejection portion 1
It is jetted almost perpendicular to the radius r of the outer cylinder passing through 0b.
Further, the sewage in the upper part of the tank P sucked from the suction part 20a by the upper circulation device 20 is jetted substantially horizontally at a position closer to the outer cylinder 1 than the middle between the outer cylinder 1 and the inner cylinder 2 at the intermediate height position. It is jetted almost perpendicular to the radius r of the outer cylinder passing through the portion 20b. At the same time, a downward flow of sewage occurs in the inner cylinder 2. Therefore, since the circulation of the sewage is started and the fluid force is imparted to the sewage at the tank bottom portion and the intermediate height position, even if the height of the aeration tank P is large, the required speed is not less than the required speed over the entire tank. The swirling flow of is surely generated.
【0023】噴出した汚水には、エジェクター機構13
によって多量の空気が泡沫状に混入されている。噴出し
た気泡は、汚水の旋回流動に追従して槽内全体へ隈無く
行き渡り、汚水中へ効率よく酸素を供給する。このた
め、外筒1と内筒2の間のどの領域においても好気性バ
クテリアの活性が高い。その上、噴出した汚水は旋回し
つつ上昇するから、最上部に達するまでの時間が長くか
かり、汚水と好気性バクテリアとの接触時間が充分に確
保される。従って、汚水の浄化処理が確実になされるの
である。The ejector mechanism 13 is attached to the discharged sewage.
A large amount of air is mixed in as a foam. The ejected bubbles follow the swirling flow of the sewage and spread throughout the tank, supplying oxygen efficiently to the sewage. Therefore, the activity of aerobic bacteria is high in any region between the outer cylinder 1 and the inner cylinder 2. Moreover, the spouted sewage rises while swirling, so it takes a long time to reach the uppermost portion, and the contact time between the sewage and aerobic bacteria is sufficiently secured. Therefore, the purification process of the dirty water is surely performed.
【0024】次に示す表1は、本発明に係る曝気槽Pの
効果を実証する試験の結果を示すものである。この試験
は、図5に示す如く、曝気槽Pの形状及び貯溜水位を一
定にし、循環装置10,20を上位と下位の2つ設けた
場合〔本発明:図(a)参照〕と、2倍の能力を有する
ポンプを備えた循環装置30を下位に1つだけ設けた場
合〔比較例:図(b)参照〕とで、それぞれの旋回流動
について流速の鉛直方向分布を測定したものである。流
速の測定は外筒1の内周面近傍で行った。試験条件は、
それぞれ下記のとおりである。
・外筒径(D)……2.3m
・内筒径(d)……0.3m
・内筒高さ(h)…8.5m
・貯溜水位(H)…9.0m
・ポンプ出力………本発明:0.75kW×2台
比較例:1.5 kW×1台
・吸込空気量………本発明: 80リットル/分(ポン
プ1台当たり)
比較例:160リットル/分
・上位循環装置の吸引部高さ位置…8m
噴出部高さ位置…5m
・下位循環装置の吸引部高さ位置…0m(内筒底部)
噴出部高さ位置…0.5mTable 1 shown below shows the results of a test demonstrating the effect of the aeration tank P according to the present invention. In this test, as shown in FIG. 5, the shape of the aeration tank P and the stored water level are constant, and two circulation devices 10 and 20 are provided [upper and lower] (the present invention: see FIG. (A)) and 2 The vertical distribution of the flow velocity is measured for each swirling flow in the case where only one circulation device 30 provided with a pump having a double capacity is provided in the lower order [Comparative example: see FIG. (B)]. . The flow velocity was measured near the inner peripheral surface of the outer cylinder 1. The test conditions are
Each is as follows.・ Outer cylinder diameter (D) …… 2.3m ・ Inner cylinder diameter (d) …… 0.3m ・ Inner cylinder height (h)… 8.5m ・ Reserved water level (H)… 9.0m ・ Pump output… …… Invention: 0.75 kW × 2 units Comparative example: 1.5 kW × 1 unit ・ Intake air amount ……… Invention: 80 liters / min (per pump) Comparative example: 160 liters / min ・ Higher level Suction part height position of circulation device ... 8m Ejection part height position ... 5m-Suction part height position of lower circulation device ... 0m (inner cylinder bottom) Spouting part height position ... 0.5m
【0025】[0025]
【表1】 [Table 1]
【0026】表1からわかるように、本発明に係る曝気
槽は、どの高さ領域においても、所要速度以上の流速が
得られているのに対し、比較例では、噴出部の近傍では
流速が高いが、上方へ向かうにつれて急速に減衰してい
る。このことから、大型のポンプ1台を使用するより
も、半分の能力のポンプ2台を、それぞれ下位循環装置
10と状位循環装置20とに使用した場合のほうが、予
想を遥かに超える高効率で旋回流動を発生させ得ること
が分かる。As can be seen from Table 1, in the aeration tank according to the present invention, a flow velocity higher than the required velocity was obtained in any height region, whereas in the comparative example, the flow velocity was close to the jet portion. High, but decays rapidly as you go up. For this reason, it is much higher than expected to use two pumps with half the capacity for the lower circulation device 10 and the position circulation device 20, respectively, than to use one large pump. It can be seen that the swirling flow can be generated by.
【0027】ところで、前記実施例では、循環装置は上
位と下位の2個所に設置すればよかったが、曝気槽の高
さ寸法が極めて大きい場合には、1又は複数の中位循環
装置を設置することが必要になる。By the way, in the above-mentioned embodiment, the circulation device should be installed at two places, the upper and lower positions. However, when the height of the aeration tank is extremely large, one or a plurality of medium circulation devices are installed. Will be needed.
【0028】そこで、中位循環装置の設置が必要となる
間隔を推定すべく、前記試験に供した出力0.75kW
のポンプによる旋回能力を測定した。即ち、前記と同一
の曝気槽(外筒径2.3m,内筒径0.3m)におい
て、出力0.75kWのポンプを備えた下位循環装置の
みを用い、貯溜水位に変更した場合の水面における各流
速を測定したものである。測定は外筒内周面で行った。
この結果を表2に示す。Therefore, in order to estimate the interval at which the intermediate circulation device needs to be installed, the output of 0.75 kW provided for the above test
The swivel ability of the pump was measured. That is, in the same aeration tank (outer cylinder diameter 2.3 m, inner cylinder diameter 0.3 m) as described above, only the lower circulation device equipped with a pump with an output of 0.75 kW was used, and the water level when changing to the stored water level Each flow velocity is measured. The measurement was performed on the inner peripheral surface of the outer cylinder.
The results are shown in Table 2.
【0029】[0029]
【表2】 [Table 2]
【0030】表2から、上記ポンプを備えた循環装置
は、水位が5mまでならば水面における流速を所要値以
上に保てることがわかる。従って、0.75kWのポン
プを利用する場合、下位の噴出部10bと上位の噴出部
20bの間隔が5mを超えるときには、中位循環装置を
設けることが望ましいと言うことができる。そのように
すれば、曝気槽の高さ寸法が極めて大きくとも、槽内全
域を所要流速以上の旋回流動状態に確実に維持すること
ができるのである。It can be seen from Table 2 that the circulation device equipped with the above-mentioned pump can maintain the flow velocity on the water surface above the required value when the water level is up to 5 m. Therefore, when a 0.75 kW pump is used, it can be said that it is desirable to provide the medium circulation device when the distance between the lower ejection part 10b and the upper ejection part 20b exceeds 5 m. By doing so, even if the height dimension of the aeration tank is extremely large, it is possible to reliably maintain the swirl flow state in which the entire area of the tank is equal to or higher than the required flow velocity.
【0031】前記は、曝気槽を外筒と内筒との二重構造
とした実施例であるが、内筒を省略した構造も可能であ
る。これを図6に示す。この場合、下位循環装置10及
び上位循環装置20の各噴出部10b,20bは、それ
ぞれ曝気槽Q本体の周壁寄りに配置することが望まし
い。曝気槽Qに汚水を貯溜したのち、下位循環装置10
と上位循環装置20を作動させることにより、汚水の全
体的な旋回流動が生起すると共に、各噴出部10b,2
0bから噴出した気泡がこの旋回流動に追従して槽内全
域へ行き渡るのは前記と同様である。The above is an embodiment in which the aeration tank has a double structure of an outer cylinder and an inner cylinder, but a structure in which the inner cylinder is omitted is also possible. This is shown in FIG. In this case, it is desirable that the ejection parts 10b and 20b of the lower circulation device 10 and the upper circulation device 20 are arranged near the peripheral wall of the aeration tank Q main body. After storing sewage in the aeration tank Q, the lower circulation device 10
By operating the upper circulation device 20 and the upper circulation device 20, an overall swirling flow of wastewater is generated, and at the same time, the jet parts 10b, 2
It is the same as the above that the bubbles ejected from 0b follow this swirling flow and spread all over the tank.
【0032】その他、本発明の実施例は、前述に限定さ
れるものではなく、種々の応用が可能である。これを図
面を用いて説明する。なお、応用例は、内筒2を設けた
場合についてのみ図示したが、内筒を省略した曝気槽Q
についても同様の応用が可能である。また、図8〜図1
2では、槽の形状のみ示し、図13〜図16では槽の形
状と循環装置の噴出部のみ示して、その他の部分は図示
を省略した。In addition, the embodiment of the present invention is not limited to the above, and various applications are possible. This will be described with reference to the drawings. Although the application example is illustrated only when the inner cylinder 2 is provided, the aeration tank Q in which the inner cylinder is omitted is shown.
The same application is possible for. Moreover, FIGS.
In FIG. 2, only the shape of the tank is shown, and in FIGS. 13 to 16, only the shape of the tank and the ejection portion of the circulation device are shown, and the other portions are not shown.
【0033】図7は、曝気槽Pの内筒2の底部及び外筒
1の周壁における上位,中位,下位それぞれに吸引部1
0a,20a,30a,40aを設けると共に、噴出部
20b,30b,10bを同様に上位,中位,下位それ
ぞれに設け、各吸引部と各噴出部を単一の大型ポンプ1
1に接続配管した実施例を示すものである。このよう
に、多数の循環装置を設置する場合には、各々を独立さ
せるばかりでなく、同図の如く、一個のポンプを共用す
ることが可能となる。FIG. 7 shows the suction part 1 at the bottom of the inner cylinder 2 of the aeration tank P and the upper, middle, and lower parts of the peripheral wall of the outer cylinder 1.
0a, 20a, 30a, 40a are provided, and jet parts 20b, 30b, 10b are similarly provided at the upper, middle, and lower positions, respectively, and each suction part and each jet part are provided as a single large pump 1.
1 shows an example in which connection piping is connected to 1. Thus, when a large number of circulation devices are installed, not only can each be made independent, but one pump can be shared, as shown in FIG.
【0034】次に槽の形状については、旋回流動の発生
を促進するため、図8に示す如く、底部1aと周壁1b
とが交わる部分に傾斜面31を設けたり、図9に示す如
く、底部1a全体を湾曲面32に形成したりすることが
考えられる。さらには、槽Pの全体形状を、図10に示
す如く楕円球状にしたり、図11に示す如く卵形状にし
たり、図12に示す如く瓢箪形状にしたりすることも考
えられる。Next, regarding the shape of the tank, in order to promote the generation of swirling flow, as shown in FIG. 8, a bottom portion 1a and a peripheral wall 1b are provided.
It is conceivable that an inclined surface 31 is provided at a portion where is intersected with or that the entire bottom portion 1a is formed into a curved surface 32 as shown in FIG. Further, the entire shape of the tank P may be elliptical as shown in FIG. 10, egg-shaped as shown in FIG. 11, or gourd-shaped as shown in FIG.
【0035】循環装置10(20)の噴出部10b(2
0b)の配置については、図13のように槽Pの周壁1
bに設けた開口を噴出部10b(20b)とすることも
できる。また図14のように、噴出部10b(20b)
の噴出方向の延長線上にガイド板40を設け、旋回流動
を案内するようにしてもよい。さらに、噴出部10b
(20b)は単一である必要はなく、例えば図15の如
く、二個の噴出部10b(20b)を中心軸に対して対
称に配置したり、図16に示すように、並列に配置した
りしてもよい。これらの実施例は、槽Pの直径が大きい
場合に有効である。The spout 10b (2) of the circulation device 10 (20)
0b) is arranged on the peripheral wall 1 of the tank P as shown in FIG.
The opening provided in b may be used as the ejection portion 10b (20b). Further, as shown in FIG. 14, the ejection portion 10b (20b)
A guide plate 40 may be provided on an extension line of the jetting direction to guide the swirling flow. Furthermore, the spout 10b
(20b) does not have to be a single unit. For example, as shown in FIG. 15, two ejection parts 10b (20b) are arranged symmetrically with respect to the central axis, or as shown in FIG. 16, they are arranged in parallel. You may. These examples are effective when the diameter of the tank P is large.
【0036】他方、吸引部については、図示は省略した
が、上位又は中位の循環装置の吸引部20a(30a)
を内筒2へ接続して、中間高さ位置でも内筒2内の汚水
吸引を行うようにしてもよい。On the other hand, although not shown in the drawing, the suction section 20a (30a) of the upper or middle circulation device is shown.
May be connected to the inner cylinder 2 to suck the dirty water in the inner cylinder 2 even at the intermediate height position.
【0037】内筒2については、これを槽Pの底部1a
から起立させるばかりでなく、図17に例示するよう
に、内筒2を適宜の支持手段50により槽底部1aから
上方へ離して配置する構造も採用し得る。内筒2の下端
を槽底部1aから離すことにより、内筒2内へ流入する
汚泥がブリッジを形成するおそれが無くなる。Regarding the inner cylinder 2, this is the bottom portion 1a of the tank P.
In addition to standing up from the bottom, as shown in FIG. 17, a structure in which the inner cylinder 2 is arranged above the tank bottom 1a by an appropriate supporting means 50 may be employed. By separating the lower end of the inner cylinder 2 from the tank bottom 1a, there is no possibility that sludge flowing into the inner cylinder 2 will form a bridge.
【0038】中位循環装置は設ける場合、その設置数と
設置間隔は、貯溜水位とポンプ出力等に応じ適宜設定さ
れるものである。つまり、各ポンプの出力を小さくして
循環装置の設置数を増加させるか、逆に比較的出力の大
きいポンプを用いて循環装置の設置間隔を広くするか
は、施工環境や処理条件に応じて選択すればよい。When the intermediate circulation device is provided, the number of installations and the installation interval are appropriately set according to the stored water level, pump output and the like. In other words, whether to reduce the output of each pump to increase the number of circulation devices installed, or conversely to increase the installation interval of circulation devices using a pump with a relatively large output depends on the construction environment and processing conditions. Just select it.
【0039】循環装置のエジェクター機構13について
は、前記実施例では副流入管16を有するものを採用し
たが、この副流入管16は必須というわけではなく、省
略が可能である。As the ejector mechanism 13 of the circulating device, the ejector mechanism 13 having the auxiliary inflow pipe 16 is adopted in the above-mentioned embodiment, but the auxiliary inflow pipe 16 is not essential and can be omitted.
【0040】また、循環装置を複数設置する場合、気泡
の滞留時間が短い上位循環装置を、エジェクター機構を
有さないポンプのみとすることも可能である。When a plurality of circulation devices are installed, it is possible to use only the pump having no ejector mechanism as the upper circulation device for which the retention time of bubbles is short.
【0041】さらに循環装置のポンプ,エジェクター機
構などを曝気槽の外部に設けた場合には、保守点検作業
が容易であるが、これらを曝気槽内に配置することも妨
げない。外筒及び内筒の直径や高さ寸法等については、
実施の態様に応じて最適のものが選択される。Further, when the pump, ejector mechanism, etc. of the circulation device are provided outside the aeration tank, the maintenance and inspection work is easy, but the arrangement of these inside the aeration tank is not hindered. Regarding the diameter and height of the outer and inner cylinders,
The optimum one is selected according to the mode of implementation.
【0042】[0042]
【発明の効果】本発明に係る深層曝気槽は、次に列挙す
る効果を発揮する。 槽内で噴出された汚水は、旋回
流動しながら徐々に上昇するので、最上部に達するまで
に要する時間が長い。従って、汚水が短絡して排出され
ることがなく、好気性バクテリアによる生物学的処理を
受ける時間が長いから、浄化作用が確実になる。 槽
下部で供給される泡沫状の空気は、汚水の旋回流動に追
従して上昇するので槽内に滞留して汚水と接触している
時間が長くなると共に、槽下部は水圧が高いから、噴出
時の気泡径は非常に小さくなり、依って単位容積あたり
の比表面積が大きくなる。その結果、汚水への酸素の供
給効率が極めて良くなるので好気性バクテリアの活性が
活発化し、浄化処理能力の向上がもたらされる。 上
位循環装置及び下位循環装置並びに必要に応じて設けた
中位循環装置により、槽内の全域に渡り汚水の旋回流動
を確実に発生させて、停溜部分を形成しない。そして、
供給される気泡は、この旋回流動に乗って曝気槽の下部
から旋回しつつ最上部まで上昇する。従って、気泡を槽
内に隈無く行き渡らせることができるので、酸素不足の
領域を生じさせるおそれがない。 中位循環装置を適
宜間隔で設けることにより、曝気槽の高さ寸法が極めて
大きくても、上記〜の効果を得ることができる。つ
まり、本発明によれば、非常に高さ寸法の大きく且つ浄
化処理能力の優れた曝気槽を得ることができるので、設
置面積の節約化を図ることが可能である。The deep aeration tank according to the present invention exhibits the effects listed below. The sewage ejected in the tank gradually rises while swirling and flowing, so that it takes a long time to reach the top. Therefore, the sewage is not short-circuited and discharged, and the biological treatment by the aerobic bacteria takes a long time, so that the purifying action is ensured. The foamy air supplied in the lower part of the tank rises following the swirling flow of sewage, so it stays in the tank for a long time and is in contact with sewage. At this time, the bubble diameter becomes very small, so that the specific surface area per unit volume becomes large. As a result, the efficiency of supplying oxygen to the wastewater becomes extremely high, so that the activity of aerobic bacteria is activated and the purification treatment capacity is improved. The upper circulation device, the lower circulation device, and the middle circulation device provided as necessary reliably generate swirling flow of the sewage over the entire area of the tank, and do not form a stagnant portion. And
The bubbles supplied rise along with the swirling flow from the lower part of the aeration tank to the uppermost part while swirling. Therefore, air bubbles can be spread all over the tank, and there is no risk of creating an oxygen-deficient region. Even if the height dimension of the aeration tank is extremely large, the effects (1) to (3) can be obtained by providing the intermediate circulation devices at appropriate intervals. That is, according to the present invention, it is possible to obtain an aeration tank having a very large height dimension and an excellent purification treatment capacity, so that it is possible to save the installation area.
【図1】本発明に係る深層曝気槽の一例を示す一部切欠
斜視図である。FIG. 1 is a partially cutaway perspective view showing an example of a deep layer aeration tank according to the present invention.
【図2】本発明に使用するエジェクター機構を示す縦断
面図である。FIG. 2 is a vertical cross-sectional view showing an ejector mechanism used in the present invention.
【図3】本発明に係る下位循環装置の一例を示す平面図
である。FIG. 3 is a plan view showing an example of a lower circulation device according to the present invention.
【図4】本発明に係る上位循環装置の一例を示す平面図
である。FIG. 4 is a plan view showing an example of a higher-level circulation device according to the present invention.
【図5】本発明の効果を調べるための試験に供した深層
曝気槽を概略的に示すものであって、(a)は本発明に
係るもの、(b)は比較例に係るものの縦断面図であ
る。FIG. 5 schematically shows a deep aeration tank used in a test for investigating the effect of the present invention, in which (a) is a longitudinal section of the present invention and (b) is a comparative example. It is a figure.
【図6】本発明に係る深層曝気槽の別態様の実施例を示
す一部切欠斜視図である。FIG. 6 is a partially cutaway perspective view showing another embodiment of the deep aeration tank according to the present invention.
【図7】本発明に係る深層曝気槽の循環装置に関する別
態様の実施例を示す縦断面図である。FIG. 7 is a vertical cross-sectional view showing another embodiment of the circulation device for the deep aeration tank according to the present invention.
【図8】本発明の別態様の実施例を示す要部縦断面図で
ある。FIG. 8 is a longitudinal sectional view of an essential part showing an embodiment of another aspect of the present invention.
【図9】本発明の別態様の実施例を示す要部縦断面図で
ある。FIG. 9 is a longitudinal sectional view of an essential part showing another embodiment of the present invention.
【図10】本発明の別態様の実施例を示す曝気槽全体の
縦断面図である。FIG. 10 is a vertical cross-sectional view of the entire aeration tank showing an embodiment of another aspect of the present invention.
【図11】本発明の別態様の実施例を示す曝気槽全体の
縦断面図である。FIG. 11 is a vertical cross-sectional view of the entire aeration tank showing another embodiment of the present invention.
【図12】本発明の別態様の実施例を示す曝気槽全体の
縦断面図である。FIG. 12 is a vertical cross-sectional view of the entire aeration tank showing another embodiment of the present invention.
【図13】本発明に使用する循環装置の噴出部に関する
別態様の実施例を示す平面断面図である。FIG. 13 is a plan sectional view showing an embodiment of another aspect relating to the ejection portion of the circulation device used in the present invention.
【図14】本発明に使用する循環装置に関する別態様の
実施例を示す平面断面図である。FIG. 14 is a cross-sectional plan view showing another embodiment of the circulation device used in the present invention.
【図15】本発明に使用する循環装置の噴出部に関する
別態様の実施例を示す平面断面図である。FIG. 15 is a plan sectional view showing an embodiment of another aspect relating to the ejection portion of the circulation device used in the present invention.
【図16】本発明に使用する循環装置の噴出部に関する
別態様の実施例を示す平面断面図である。FIG. 16 is a plan cross-sectional view showing an embodiment of another aspect relating to the ejection portion of the circulation device used in the present invention.
【図17】本発明に係る深層曝気槽の別態様の実施例を
示す縦断面図である。FIG. 17 is a vertical cross-sectional view showing another embodiment of the deep aeration tank according to the present invention.
P,Q…深層曝気槽 1…外筒(又は槽本体) 1a…
外筒底部 2…内筒 2a…流入開口 3…流出部 5
…汚水供給量 6…汚泥返送管 10…下位循環装置
10a…吸引部 10b…噴出部 11…ポンプ 12
…配管 13…エジェクター機構 14…縮流部 15
…通気管 16…副流入管 20…下位循環装置 20
a…吸引部 20b…噴出部 21…ポンプ 22…配
管 r…外筒の半径P, Q ... Deep aeration tank 1 ... Outer cylinder (or tank body) 1a ...
Outer cylinder bottom 2 ... Inner cylinder 2a ... Inflow opening 3 ... Outflow section 5
… Sewage supply amount 6… Sludge return pipe 10… Lower-level circulation device
10a ... Suction part 10b ... Spout part 11 ... Pump 12
... Piping 13 ... Ejector mechanism 14 ... Constriction part 15
... Vent pipe 16 ... Sub-inflow pipe 20 ... Lower circulation device 20
a ... Suction part 20b ... Spouting part 21 ... Pump 22 ... Piping r ... Radius of outer cylinder
Claims (6)
縦長筒状の曝気槽であって、当該曝気槽内の流体を吸引
してこれを曝気槽内の下部へ噴出するための下位循環装
置が設けられると共に、当該曝気槽内の流体を吸引して
これを前記下位循環装置の噴出部よりも上方において曝
気槽内へ噴出するための上位循環装置が設けられ、前記
上位循環装置及び下位循環装置は、配管,ポンプ及びこ
のポンプの吐出側において空気を流体中へ混入させるエ
ジェクター機構より構成され、前記上位循環装置及び下
位循環装置それぞれの噴出方向は流体を槽内で旋回流動
させ得る方向に設定されていることを特徴とする深層曝
気槽。1. A vertically elongated cylindrical aeration tank having a sewage supply part and a treated water outflow part for sucking fluid in the aeration tank and ejecting the fluid to the lower part in the aeration tank. A lower circulation device is provided, and a higher circulation device for sucking the fluid in the aeration tank and ejecting the fluid into the aeration tank above the ejection part of the lower circulation device is provided. The lower circulation device is composed of a pipe, a pump, and an ejector mechanism that mixes air into the fluid on the discharge side of the pump. The jetting direction of each of the upper circulation device and the lower circulation device causes the fluid to swirl in the tank. A deep aeration tank characterized by being set in the direction of obtaining.
縦長筒状の曝気槽であって、当該曝気槽内の流体を吸引
してこれを曝気槽内の下部へ噴出するための下位循環装
置と、当該曝気槽内の流体を吸引してこれを前記下位循
環装置の噴出部よりも上方において曝気槽内へ噴出する
ための上位循環装置と、当該曝気槽内の流体を吸引して
これを前記上位循環装置と下位循環装置それぞれの噴出
部の中間位置において曝気槽内へ噴出するための中位循
環装置とが設けられ、前記上位循環装置,中位循環装置
及び下位循環装置は、配管,ポンプ及びこのポンプの吐
出側において空気を流体中へ混入させるエジェクター機
構より構成され、前記上位循環装置,中位循環装置帯び
下位循環装置それぞれの噴出方向は流体を槽内で旋回流
動させ得る方向に設定されていることを特徴とする深層
曝気槽。2. A vertically elongated cylindrical aeration tank having a waste water supply part and a treated water outflow part for sucking fluid in the aeration tank and ejecting the fluid to the lower part in the aeration tank. A lower circulation device, an upper circulation device for sucking the fluid in the aeration tank and ejecting the fluid into the aeration tank above the ejection part of the lower circulation device, and sucking the fluid in the aeration tank. And a middle-level circulation device for ejecting this into the aeration tank at an intermediate position between the ejection parts of the upper circulation device and the lower circulation device, and the upper circulation device, the middle circulation device and the lower circulation device are , A pipe, a pump, and an ejector mechanism for mixing air into the fluid on the discharge side of the pump. The jetting direction of each of the upper circulation device, the middle circulation device, and the lower circulation device causes the fluid to swirl in the tank. To get Deep aeration tank, characterized in that it is a constant.
求項2に記載の深層曝気槽。3. The deep aeration tank according to claim 2, wherein a plurality of the intermediate circulation devices are provided.
外筒と該外筒と同心的に配置され上部に流入開口を有す
る内筒とよりなる縦長の曝気槽であって、前記内筒の流
入開口は前記外筒の流出部よりも下方に位置し、前記内
筒内の流体を吸引してこれを前記外筒と内筒との間へ噴
出するための下位循環装置が設けられると共に、当該曝
気槽内の流体を吸引してこれを前記下位循環装置の噴出
部よりも上方において前記外筒と内筒との間へ噴出する
ための上位循環装置が設けられ、前記上位循環装置及び
下位循環装置は、配管,ポンプ及びこのポンプの吐出側
において空気を流体中へ混入させるエジェクター機構よ
り構成され、前記上位循環装置及び下位循環装置それぞ
れの噴出方向は流体を前記外筒と内筒との間で旋回流動
させ得る方向に設定されていることを特徴とする深層曝
気槽。4. A vertically long aeration tank comprising an outer cylinder having a sewage water supply part and a treated water outflow part, and an inner cylinder concentrically arranged with the outer cylinder and having an inflow opening in the upper part thereof. The inflow opening of the inner cylinder is located below the outflow portion of the outer cylinder, and a lower circulation device for sucking the fluid in the inner cylinder and ejecting the fluid between the outer cylinder and the inner cylinder is provided. In addition, an upper circulation device is provided for sucking the fluid in the aeration tank and ejecting the fluid between the outer cylinder and the inner cylinder above the ejection portion of the lower circulation device, and the upper circulation device is provided. The device and the lower circulation device are composed of a pipe, a pump, and an ejector mechanism that mixes air into the fluid on the discharge side of the pump. The jetting direction of each of the upper circulation device and the lower circulation device causes the fluid to flow inside the outer cylinder. Set in a direction that allows swirling flow with the cylinder. Deep aeration tank, characterized in that it is.
外筒と該外筒と同心的に配置され上部に流入開口を有す
る内筒とよりなる縦長の曝気槽であって、前記内筒の流
入開口は前記外筒の流出部よりも下方に位置し、前記内
筒内の流体を吸引してこれを前記外筒と内筒との間へ噴
出するための下位循環装置と、当該曝気槽内の流体を吸
引してこれを前記下位循環装置の噴出部よりも上方にお
いて前記外筒と内筒との間へ噴出するための上位循環装
置と、当該曝気槽内の流体を吸引してこれを前記上位循
環装置と下位循環装置それぞれの噴出部の中間位置にお
いて前記外筒と内筒との間へ噴出するための中位循環装
置とが設けられ、前記上位循環装置,中位循環装置及び
下位循環装置は、配管,ポンプ及びこのポンプの吐出側
において空気を流体中へ混入させるエジェクター機構よ
り構成され、前記上位循環装置,中位循環装置及び下位
循環装置それぞれの噴出方向は流体を前記外筒と内筒と
の間で旋回流動させ得る方向に設定されていることを特
徴とする深層曝気槽。5. A vertically long aeration tank comprising an outer cylinder having a sewage supply part and a treated water outflow part, and an inner cylinder arranged concentrically with the outer cylinder and having an inflow opening in the upper part thereof. The inflow opening of the inner cylinder is located below the outflow portion of the outer cylinder, and a lower circulation device for sucking the fluid in the inner cylinder and ejecting the fluid between the outer cylinder and the inner cylinder, An upper circulation device for sucking the fluid in the aeration tank and ejecting the fluid between the outer cylinder and the inner cylinder above the ejection portion of the lower circulation device, and sucking the fluid in the aeration tank. Then, a middle-level circulation device for ejecting this between the outer cylinder and the inner cylinder at an intermediate position between the ejection parts of the upper circulation device and the lower circulation device is provided. Circulators and subordinate circulation devices allow air to flow through the piping, pump, and discharge side of this pump. The upper circulation device, the middle circulation device, and the lower circulation device are formed of ejector mechanisms to be mixed in, and the ejection directions of the upper circulation device, the middle circulation device, and the lower circulation device are set so as to allow the fluid to swirl between the outer cylinder and the inner cylinder. Deep aeration tank characterized by that.
求項5に記載の深層曝気槽。6. The deep aeration tank according to claim 5, wherein a plurality of the intermediate circulation devices are provided.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3295278A JPH0515894A (en) | 1991-05-09 | 1991-08-22 | Deep aeration tank |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3-201555 | 1991-05-09 | ||
JP20155591 | 1991-05-09 | ||
JP3295278A JPH0515894A (en) | 1991-05-09 | 1991-08-22 | Deep aeration tank |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0515894A true JPH0515894A (en) | 1993-01-26 |
Family
ID=26512861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3295278A Pending JPH0515894A (en) | 1991-05-09 | 1991-08-22 | Deep aeration tank |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0515894A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010094566A (en) * | 2008-10-14 | 2010-04-30 | Kubota Kankyo Service Kk | Aerator and waste water treatment equipment |
CN115259353A (en) * | 2022-06-16 | 2022-11-01 | 石家庄中油优艺环保科技有限公司 | Circulating treatment aeration oxidation tank for sewage treatment |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5627113A (en) * | 1979-08-13 | 1981-03-16 | Dainippon Printing Co Ltd | Production of case for luquid crystal cell |
JPS5665685A (en) * | 1979-11-02 | 1981-06-03 | Sumitomo Heavy Ind Ltd | Aeration method of deep layer and aeration tank using the same |
JPH02135196A (en) * | 1988-11-16 | 1990-05-24 | Kubota Ltd | Sewage and waste water treating device |
-
1991
- 1991-08-22 JP JP3295278A patent/JPH0515894A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5627113A (en) * | 1979-08-13 | 1981-03-16 | Dainippon Printing Co Ltd | Production of case for luquid crystal cell |
JPS5665685A (en) * | 1979-11-02 | 1981-06-03 | Sumitomo Heavy Ind Ltd | Aeration method of deep layer and aeration tank using the same |
JPH02135196A (en) * | 1988-11-16 | 1990-05-24 | Kubota Ltd | Sewage and waste water treating device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010094566A (en) * | 2008-10-14 | 2010-04-30 | Kubota Kankyo Service Kk | Aerator and waste water treatment equipment |
CN115259353A (en) * | 2022-06-16 | 2022-11-01 | 石家庄中油优艺环保科技有限公司 | Circulating treatment aeration oxidation tank for sewage treatment |
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