JPH0515893A - Vertical type aeration tank - Google Patents
Vertical type aeration tankInfo
- Publication number
- JPH0515893A JPH0515893A JP3295280A JP29528091A JPH0515893A JP H0515893 A JPH0515893 A JP H0515893A JP 3295280 A JP3295280 A JP 3295280A JP 29528091 A JP29528091 A JP 29528091A JP H0515893 A JPH0515893 A JP H0515893A
- Authority
- JP
- Japan
- Prior art keywords
- aeration tank
- tank
- inner cylinder
- cylinder
- fluid
- 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)
- Activated Sludge Processes (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号公報などで提案されて
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 been hitherto disclosed. 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 the water pressure at the bottom of the tank is high, so that 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、酸素の溶解効率を悪くする。
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。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 collected air has a smaller specific surface area as the volume of the collected air increases and deteriorates the dissolution efficiency of oxygen.
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.
【０００６】[0006]
【課題を解決するための手段】本発明が、上記欠点を解
決するべく採用した手段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筒状の縦型曝気槽内
に、当該曝気槽内の流体を吸引してこれを当該曝気槽内
へ噴出する循環装置を設け、当該循環装置を、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し、当該循環装置の
噴出方向を流体を槽内で旋回流動させ得る方向に設定し
たことである。The present invention is characterized by means adopted to solve the above-mentioned drawbacks in that a vertical vertical aeration tank having a sewage supply part and a treated water outflow part is provided. Is provided with a circulation device for sucking the fluid in the aeration tank and ejecting the fluid into the aeration tank, and the ejector mechanism for mixing the circulation device with air in the fluid at the piping, the pump, and the discharge side of the pump. In this configuration, the jetting direction of the circulation device is set to a direction in which the fluid can swirl in the tank.
【０００７】また本発明のより好ましい態様は、縦型曝
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、当該内筒内の流体を吸引してこれを前記外筒と
内筒と間へ噴出する循環装置とから成るものとし、前記
内筒の流入開口を前記外筒の流出部よりも下方に位置せ
しめ、前記循環装置の噴出方向を流体を外筒と内筒との
間で旋回流動させ得る方向に設定することである。A more preferable aspect of the present invention is a vertical aeration tank, which has an outer cylinder provided with a waste water supply part and a treated water outflow part, and an inflow opening arranged concentrically with the outer cylinder. An inner cylinder and a circulation device for sucking the fluid in the inner cylinder and ejecting the fluid between the outer cylinder and the inner cylinder are provided, and the inflow opening of the inner cylinder is more than the outflow portion of the outer cylinder. It is positioned below and the jetting direction of the circulation device is set to a direction in which the fluid can swirl between the outer cylinder and the inner cylinder.
【０００８】[0008]
【作用】本発明に係る縦型曝気槽は、循環装置により曝
気槽内の汚水を吸引したのち、これを、槽内の汚水が旋
回流動し得る方向へ噴出する。これにより、槽内の汚水
に流動力が付与され、旋回流動が開始する。旋回流動は
しだいに槽内全体へ伝播していき、やがて槽内全域にわ
たる旋回流動が発生する。In the vertical aeration tank according to the present invention, after the sewage in the aeration tank is sucked by the circulation device, the sewage in the tank is jetted in a direction in which the sewage can swirl and flow. As a result, a flow force is applied to the dirty water in the tank, and swirling flow starts. The swirling flow gradually propagates throughout the tank, and eventually the swirling flow is generated over the entire area of the tank.
【０００９】ところで、上記循環装置におけるポンプの
吐出側には空気を混入させるエジェクター機構が設けら
れているため、噴出流は多量の空気を泡沫状に含んだ状
態となる。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。それ故、供給
した空気中の酸素を汚水中へ効率良く溶存させることが
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。By the way, since the ejector mechanism for mixing air is provided on the discharge side of the pump in the circulation device, the jet flow is in a state of containing a large amount of air in the form of foam. The foamy air jetted from the circulation device together with the dirty water moves upward gradually following the swirling flow generated as described above, but without stopping. Therefore, the contact time between air and waste water is very long. Therefore, the oxygen in the supplied air can be efficiently dissolved in the wastewater, and the aeration amount can be minimized.
【００１０】さらに、噴出させた気泡は、旋回しつつ曝
気槽の隅々まで行き渡るので、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 jetted air bubbles swirl and spread to every corner of the aeration tank, the dissolved oxygen is uniformly distributed in the tank, and there is no possibility of causing an oxygen-deficient region.
【００１１】なお、本発明の好ましい態様として、曝気
層を外筒と内筒とからなる二重構造にすると共に、循環
装置により汚水を内筒内から吸引して外筒と内筒との間
へ噴出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、内筒内部においては汚水の吸引
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に明確に区分されて
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。As a preferred embodiment of the present invention, the aeration layer has a double structure consisting of an outer cylinder and an inner cylinder, and sewage is sucked from the inside of the inner cylinder by a circulation device so that the space between the outer cylinder and the inner cylinder is In the case of adopting the configuration of ejecting to, swirling flow of sewage occurs between the outer cylinder and the inner cylinder, and a downward flow due to suction of sewage occurs inside the inner cylinder. Further, the swirling flow and the downward flow are clearly separated by the inner cylinder so as not to 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.
【００１２】[0012]
【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。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings showing the embodiments.
【００１３】（第一実施例）図１に、本発明に係る縦形
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
量５及び処理水と共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。なお、汚水と返送汚泥とを内筒２内へ直接
流入するようにしたのは、汚水と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。(First Embodiment) FIG. 1 shows an example of a vertical aeration tank P according to the present invention. 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 in the upper part of the outer cylinder 1, and a sludge return pipe 6 for returning a part of the activated sludge that has flowed out together with the treated water 5 and the treated water is provided in the upper part of the inner cylinder 2. ing. 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. The sewage and the returned sludge are allowed to directly flow into the inner cylinder 2 because the sewage and the activated sludge are easily contacted with each other, and the microorganisms in the activated sludge promote the initial adsorption of the substrate in the sewage. By doing so, the biological reaction is improved.
【００１４】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、その直径が大きす
ぎると、汚水の処理領域が減少するのみならず、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 the treated area of the wastewater is reduced but also it acts as a resistance to the swirling flow of the wastewater. 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 a bridge of activated sludge is easily generated. Therefore, the inner cylinder 2 preferably has a diameter of at least 300 mm or more.
【００１５】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、後述の試験結
果から、槽底部１ａ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阻止するには、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 in 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 there is no particular restriction on the distance from the water surface. Regarding the height of the inner cylinder 2, from the test results described later, in order to prevent the sewage ejected from the tank bottom 1a from flowing into the inner cylinder 2 in a short circuit without being aerated, 1 m
It is desirable to have the above.
【００１６】内筒２の底部近傍には、内部の汚水を吸引
してこれを外筒１と内筒２との中間位置で噴出させる循
環装置１０が設けられている。この循環装置１０は、一
端の吸引部１０ａが内筒２に接続され他端の噴出部１０
ｂが内筒２の外側に配置された配管１２と、この配管１
２の途中に設けられたポンプ１１と、このポンプ１１の
吐出側に設けられ通気管１５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 circulator 10 is provided near the bottom of the inner cylinder 2 for sucking the dirty water in the inner cylinder and ejecting it at an intermediate position between the outer cylinder 1 and the inner cylinder 2. This circulation device 10 has a suction part 10 a at one end connected to the inner cylinder 2 and a jetting part 10 at the other end.
a pipe 12 in which b is arranged outside the inner cylinder 2, and the pipe 1
It is composed of a pump 11 provided in the middle of 2, and an ejector mechanism 13 provided on the discharge side of the pump 11 for mixing the air taken in through the ventilation pipe 15 into the sewage.
【００１７】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及び機能を有
する。即ち、ポンプ１１の吐出側の配管１２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１
３ａ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、極めて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 (Jun.
The application is based on the ejector mechanism disclosed in U.S.A. 18) and has an internal structure and functions as shown in FIG. That is, inside the casing 13a connected to the pipe 12 on the discharge side of the pump 11, the contraction portion 14 whose pipe diameter decreases toward the outflow side is formed, and at the same time, the casing 1
3a is provided with a ventilation pipe 15 that communicates with the outside air and a sub-inflow pipe 16 that communicates with the aeration tank P and that directly introduces dirty water into the casing 13a. The sewage fed from the pipe 12 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. As a result, the dirty water is jetted into the aeration tank P while 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.
【００１８】本実施例では、上記噴出部１０ｂの噴出方
向を、汚水の流動効果が大きくなるようほぼ水平にする
と共に、図３に示す如く、当該噴出部１０ｂ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。けれ
ども、この設定は限定的なものではなく、汚水を旋回流
動させ得る噴出方向であれば、水平方向に対して上下に
傾斜しても、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の配置は、流動効
率の面から見て、外筒１寄りとするのが最適と思われる
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、噴出部１０ｂを底部又は
底部近傍に設けることとしたが、実施の条件によって
は、底部からやや離隔させて設置してもよい。In the present embodiment, the jetting direction of the jetting portion 10b is made substantially horizontal so that the flow effect of the sewage is increased, and as shown in FIG. 3, with respect to the radius r of the outer cylinder passing through the jetting portion 10b. Set to be almost vertical. However, this setting is not limited, and it may be tilted vertically with respect to the horizontal direction or tilted inward and outward with respect to the radius r as long as it is a jetting direction capable of swirling and flowing the wastewater. Absent. Further, from the viewpoint of flow efficiency, it is optimal that the ejection portion 10b is arranged closer to the outer cylinder 1, but it does not prevent appropriate changes depending on the implementation situation. In this embodiment, the ejection portion 10b is provided at or near the bottom portion, but it may be provided at a distance from the bottom portion depending on the implementation conditions.
【００１９】ところで一般に、曝気槽Ｐ内の活性汚泥
は、汚水の流速が２０ｃｍ／秒未満では沈降すると言わ
れている。そこで、前記ポンプ１１には、汚水を２０ｃ
ｍ／秒以上の流速で旋回流動させることができるような
能力を備えたものを選定する。By the way, it is generally said that the activated sludge in the aeration tank P settles when the flow rate of the sewage is less than 20 cm / sec. Therefore, the pump 11 is filled with 20 c of waste water.
A material having the ability to swirl at a flow velocity of m / sec or more is selected.
【００２０】上述のような構成された本発明に係る縦型
曝気槽Ｐに汚水を貯溜し、循環装置１０を始動させる
と、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１０ｂを通る半径ｒに対しほぼ垂
直に噴出される。これと同時に、内筒２内では、汚水の
下降流が生起し、循環流動が開始される。そして、槽底
部１ａで発生した旋回流動が速やかに上方へ伝播してゆ
き、槽内全体における汚水の旋回流動が発生する。When sewage is stored in the vertical aeration tank P according to the present invention having the above-described structure and the circulation device 10 is started, the sewage in the inner cylinder 2 is sucked by the pump 11 and then the outside. It is ejected substantially horizontally at a position closer to the outer cylinder 1 than the middle of the cylinder 1 and the inner cylinder 2 and substantially perpendicular to the radius r passing through the ejection portion 10b. At the same time, a downward flow of sewage occurs in the inner cylinder 2, and circulation flow is started. Then, the swirling flow generated in the tank bottom 1a rapidly propagates upward, and the swirling flow of the dirty water is generated in the entire tank.
【００２１】噴出部１０ｂから噴出した汚水には、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。しかも、槽底部
１ａで噴出した汚水は旋回しつつ上昇するから、これが
最上部に達するまでの時間、言い換えると、汚水と好気
性バクテリアとの接触時間が非常に長い。従って、汚水
の浄化処理が確実になされる。A large amount of air is mixed in the sewage ejected from the ejecting portion 10b in the form of foam by the ejector mechanism 13. 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, since the sewage ejected from the tank bottom 1a rises while swirling, the time until it reaches the top, in other words, the contact time between the sewage and aerobic bacteria is very long. Therefore, the purification process of the dirty water is surely performed.
【００２２】（第二実施例）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４に示す。この場合におい
ても、循環装置１０を作動させることにより、曝気槽Ｑ
内において汚水の全体的な旋回流動が生起すると共に、
噴出部１０ｂから噴出した気泡が、この旋回流動に追従
して、曝気槽Ｑの全域へ行き渡るのは、前記実施例と同
様である。(Second Embodiment) 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 without the inner cylinder is also possible. This is shown in FIG. Even in this case, the aeration tank Q can be operated by operating the circulation device 10.
In the inside of the swirling flow of the entire wastewater occurs,
The bubbles ejected from the ejection portion 10b follow the swirling flow and spread to the entire area of the aeration tank Q, as in the above-described embodiment.
【００２３】なお、本実施例においては、吸引部１０ａ
と噴出部１０ｂとの配置を、図５に示す如く、両者を平
面視して、互いに中心軸に対して対称となるようにする
ことも可能である。また、図６に例示する如く、吸引部
１０ａを上方へ配置して、両者間に高低差を持たせても
よい。さらに、噴出部１０ｂの噴出方向及び配置に関し
て前記第一実施例で述べたのと同様の変更を施すことも
できる。In this embodiment, the suction section 10a
It is also possible to dispose the squirt portion 10b and the squirt portion 10b so as to be symmetrical with respect to the central axis with respect to each other in plan view, as shown in FIG. Further, as illustrated in FIG. 6, the suction portion 10a may be arranged upward so that there is a difference in height between them. Furthermore, the same changes as those described in the first embodiment can be made regarding the ejection direction and arrangement of the ejection portion 10b.
【００２４】次に示す表１は、本発明の第一実施例に係
る曝気槽Ｐ及び第二実施例に係る曝気槽Ｑについて、そ
の酸素供給能力を、従来例と比較試験した結果を示すも
のである。同試験では、外筒の直径（Ｄ），外筒の直径
（ｄ），貯溜水位（Ｈ），ポンプ出力及び空気吹込量を
一定にし、内筒を設けると共にその高さ寸法（Ｂ）を変
えたとき〔図７（ａ）参照〕、内筒を省略したとき〔図
７（ｂ）参照〕、及び従来例として槽底部に最も一般的
な曝気手段である散気管２０を設置したとき〔図７
（ｃ）参照〕それぞれについて、総括酸素移動容量係数
ＫＬａ（２０）を測定した。Table 1 shown below shows the results of a comparative test of the oxygen supply capacity of the aeration tank P according to the first embodiment of the present invention and the aeration tank Q of the second embodiment, as compared with the conventional example. Is. In the same test, the diameter of the outer cylinder (D), the diameter of the outer cylinder (d), the stored water level (H), the pump output and the air injection amount were made constant, the inner cylinder was provided, and the height dimension (B) was changed. When the inner cylinder is omitted [see FIG. 7 (b)], and when the air diffuser 20 which is the most common aeration means is installed at the bottom of the tank as a conventional example [FIG. 7 (a)] [FIG. 7
See (c)] The overall oxygen transfer capacity coefficient KLa (20) was measured for each.
【００２５】試験に供した曝気槽の条件はそれぞれ下記
のとおりである。
・外筒径（Ｄ）……１．２ｍ
・内筒径（ｄ）……０．３ｍ
・貯溜水位（Ｈ）…２．０ｍ
・ポンプ出力………０．７５ｋＷ
・吹込空気量………８０リットル／分The conditions of the aeration tank used in the test are as follows.・ Outer cylinder diameter (D) …… 1.2m ・ Inner cylinder diameter (d) …… 0.3m ・ Reserved water level (H) ・ ・ ・ 2.0m ・ Pump output ……… 0.75kW ・ Blown air volume ……… 80 liters / minute
【００２６】[0026]
【表１】 [Table 1]
【００２７】表１から明らかなように、本発明に係る曝
気槽は、いずれも従来例より非常に高いＫＬａ値を示し
ており、酸素の供給効率が極めて優れていることが分か
る。特に、内筒の高さ寸法（Ｂ）が１ｍ以上であればＫ
Ｌａ値に顕著な相違が生ずることはない。但し、内筒の
高さ寸法（Ｂ）が１ｍ未満であるとやや効果が劣り、内
筒を省略した場合は、従来例に比べれば遥かに高いＫＬ
ａ値を示すものの、内筒を有するものはより値が低くな
っている。これは、内筒を省略した場合又は内筒の高さ
が１ｍ未満の場合、噴出部１０ｂから噴出された気泡の
うち、吸引部１０ａによって一部が短絡的に吸引される
ためであろうと推測される。しかしながら、槽全体とし
ては、十分な酸素量が供給されており、実用上、支障を
きたすことはない。As is clear from Table 1, all of the aeration tanks according to the present invention have a KLa value much higher than that of the conventional example, indicating that the oxygen supply efficiency is extremely excellent. Especially if the height dimension (B) of the inner cylinder is 1 m or more, K
There is no significant difference in the La value. However, if the height (B) of the inner cylinder is less than 1 m, the effect is slightly inferior, and if the inner cylinder is omitted, the KL is much higher than the conventional example.
Although the value a is shown, the value with the inner cylinder is lower. It is presumed that this is because when the inner cylinder is omitted or when the height of the inner cylinder is less than 1 m, some of the bubbles ejected from the ejection unit 10b are short-circuited and sucked by the suction unit 10a. To be done. However, a sufficient amount of oxygen is supplied to the entire tank, which does not cause any practical problems.
【００２８】他方、最も一般的な曝気手段として図７
（ｃ）に示す散気管２０を槽底部に設置した従来例で
は、１分間当たりの吹込空気量，槽形状，貯溜水位など
の条件が同一であるにもかかわらず、そのＫＬａ値は本
発明よりも遥かに低い４．４（／時）であった。しか
も、同従来例においては、散気装置２０から噴出した気
泡は真っ直ぐに浮上しようとするため、散気装置２０の
直上領域と周辺領域とで気泡分布に粗密が生じ、その結
果、槽内に溶存酸素濃度の低い領域が形成されるという
ことが分かった。このような事実からも、本発明が採用
するエジェクター機構を備えた循環装置が、空気の供給
手段として極めて優れた機能を有するものであることが
理解される。On the other hand, FIG. 7 shows the most general aeration means.
In the conventional example in which the air diffuser 20 shown in (c) is installed at the bottom of the tank, the KLa value is more than that of the present invention, even though the conditions such as the blown air amount per minute, the tank shape, and the stored water level are the same. It was 4.4 (/ hour), which is much lower. In addition, in the conventional example, since the bubbles ejected from the air diffuser 20 try to float up straight, the bubble distribution in the region directly above the air diffuser 20 and the peripheral region is coarse and dense, and as a result, in the tank. It was found that a region having a low dissolved oxygen concentration was formed. From such a fact, it is understood that the circulation device equipped with the ejector mechanism adopted by the present invention has an extremely excellent function as an air supply means.
【００２９】ところで、本発明の実施例は、前記に限定
されるものではなく、種々の応用が可能である。これ
を、図面に用いて説明する。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
１２では槽の形状のみを示し、図１３〜図１６では槽の
形状と循環装置の噴出部のみを示して、その他の部分は
図示を省略した。By the way, 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 shown only in the case where the inner cylinder 2 is provided, the same application can be made to the aeration tank Q in which the inner cylinder is omitted. Further, FIGS. 8 to 12 show only the shape of the tank, and FIGS. 13 to 16 show only the shape of the tank and the ejection portion of the circulation device, and other portions are omitted.
【００３０】まず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。First, 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.
【００３１】循環装置１０の噴出部１０ｂの配置につい
ては、図１３のように、槽Ｐの周壁１ｂに設けた開口を
噴出部１０ｂとすることもできる。また図１４のよう
に、噴出部１０ｂ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は単一である必要はなく、例えば図１
５の如く、二個の噴出部１０ｂ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。Regarding the arrangement of the jetting portion 10b of the circulation device 10, as shown in FIG. 13, the opening provided in the peripheral wall 1b of the tank P may be used as the jetting portion 10b. Further, as shown in FIG. 14, the guide plate 40 is provided on the extension line of the ejection portion 10b in the ejection direction.
May be provided to guide the swirling flow. Further, the ejection portion 10b does not have to be a single ejection portion, and is, for example, as shown in FIG.
5, the two ejection parts 10b may be arranged symmetrically with respect to the central axis, or may be arranged in parallel as shown in FIG. These examples are effective when the diameter of the tank P is large.
【００３２】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。As for 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.
【００３３】また、循環装置１０の吸引部１０ａの配置
は、図１８に示すように、内筒２の底部へ接続する構造
も可能である。The suction part 10a of the circulation device 10 may be arranged so that it is connected to the bottom of the inner cylinder 2 as shown in FIG.
【００３４】循環装置１０のエジェクター機構１３につ
いては、前記第一及び第二実施例は共に副流入管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。Regarding the ejector mechanism 13 of the circulation device 10, both the first and second embodiments employ the one having the auxiliary inflow pipe 16, but this auxiliary inflow pipe 16 is not essential and can be omitted. Is.
【００３５】その他、循環装置１０のポンプ１１，エジ
ェクター機構１３などを曝気槽Ｐの外部へ設けた場合に
は、保守点検作業が容易となるが、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。In addition, when the pump 11 of the circulation device 10, the ejector mechanism 13 and the like are provided outside the aeration tank P, maintenance and inspection work is facilitated, but the arrangement of these inside the aeration tank is not hindered. . Optimal diameters and heights of the outer cylinder and the inner cylinder are selected according to the embodiment.
【００３６】[0036]
【発明の効果】本発明に係る縦型曝気槽は、次に列挙す
る効果を発揮する。 曝気槽内へ噴出された汚水は、
旋回流動しながら徐々に上昇するため、最上部に達する
までの時間が長い。従って、汚水が短絡して排出される
ことが決してなく、好気性バクテリアにより生物学的処
理を受ける時間が長いから、浄化作用が確実である。
曝気槽内へ汚水と共に噴出された泡沫状の空気は、汚
水の旋回流動に追従して上昇するので、汚水と接触して
いる時間が長い。しかも、曝気槽を縦長にしたことによ
り槽下部の水圧が高くなるから、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、汚水への酸素の溶解効率が極めて高
くなり、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。 汚水の旋回流動は槽内
の全域で生じ、停溜部分を形成しない。そして、供給さ
れる気泡は、この旋回流動に追従して旋回しつつ最上部
まで上昇する。従って、気泡を槽内へ隈無く行き渡らせ
ることができるので、酸素不足の領域を生じさせること
がない。The vertical aeration tank according to the present invention exhibits the effects listed below. The sewage discharged into the aeration tank is
It takes a long time to reach the top because it rises gradually while swirling and flowing. Therefore, the sewage is never short-circuited and discharged, and the time required for biological treatment by aerobic bacteria is long, so the purification action is reliable.
The foamy air jetted together with the dirty water into the aeration tank rises following the swirling flow of the dirty water, so that the contact time with the dirty water is long. Moreover, since the aeration tank is vertically long, the water pressure in the lower part of the tank increases, so the bubble diameter at the time of ejection becomes extremely small, and the specific surface area per unit volume increases accordingly. As a result, the dissolution efficiency of oxygen in wastewater becomes extremely high, the activity of aerobic bacteria is activated, and the purification treatment capacity is improved. The swirling flow of sewage occurs throughout the tank and does not form a stagnant portion. Then, the bubbles supplied rise to the uppermost part while swirling following this swirling flow. Therefore, air bubbles can be spread all over the tank, and an oxygen-deficient region is not generated.
【図１】本発明に係る縦型曝気槽の第一実施例を示す一
部切欠斜視図である。FIG. 1 is a partially cutaway perspective view showing a first embodiment of a vertical aeration tank according to the present invention.
【図２】本発明に使用する循環装置のエジェクター機構
を示す縦断面図である。FIG. 2 is a vertical sectional view showing an ejector mechanism of a circulation device used in the present invention.
【図３】図１に示す縦型曝気槽の平面図である。FIG. 3 is a plan view of the vertical aeration tank shown in FIG.
【図４】本発明に係る縦型曝気槽の第二実施例を示す部
分切欠斜視図である。FIG. 4 is a partially cutaway perspective view showing a second embodiment of the vertical aeration tank according to the present invention.
【図５】図４の縦型曝気槽における循環装置の別態様の
実施例を示す平面図である。FIG. 5 is a plan view showing another embodiment of the circulation device in the vertical aeration tank of FIG.
【図６】図４の縦型曝気槽における循環装置のさらに別
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 still another embodiment of the circulation device in the vertical aeration tank of FIG.
【図７】本発明の効果を調べるための試験に使用した縦
型曝気槽を示すものであって、（ａ）は本発明の第一実
施例に係るもの、（ｂ）は本発明の第二実施例に係るも
の、（ｃ）は散気管による空気供給を行う従来例に係る
ものの縦断面図である。FIG. 7 shows a vertical aeration tank used in a test for investigating the effect of the present invention, in which (a) relates to the first embodiment of the present invention and (b) shows the first embodiment of the present invention. 2C is a longitudinal sectional view of a conventional example in which air is supplied by an air diffuser according to the second embodiment.
【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縦型曝気槽全
体の縦断面図である。FIG. 10 is a vertical sectional view of the entire vertical aeration tank showing another embodiment of the present invention.
【図１１】本発明の別態様の実施例を示す縦型曝気槽全
体の縦断面図である。FIG. 11 is a vertical sectional view of the entire vertical 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縦型曝気槽全
体の縦断面図である。FIG. 12 is a vertical sectional view of the entire vertical aeration tank showing another embodiment of the present invention.
【図１３】本発明の縦型曝気槽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 vertical aeration tank of the present invention.
【図１４】本発明の縦型曝気槽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 plan sectional view showing another embodiment of the circulation device used in the vertical aeration tank of the present invention.
【図１５】本発明の縦型曝気槽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 cross-sectional view showing an embodiment of another aspect relating to the ejection portion of the circulation device used in the vertical aeration tank of the present invention.
【図１６】本発明の縦型曝気槽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 vertical aeration tank of the present invention.
【図１７】本発明に係る縦型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 vertical aeration tank according to the present invention.
【図１８】本発明の縦型曝気槽に使用する循環装置に関
する別態様の実施例を示す要部縦断面図である。FIG. 18 is a longitudinal sectional view of an essential part showing another embodiment of the circulating device used in the vertical aeration tank of the present invention.
Ｐ，Ｑ…縦型曝気槽 １…外筒（又は槽本体） １ａ…
槽底部 １ｂ…槽周壁
２…内筒 ２ａ…流入開口 ３…流出部 ５…汚水供給
管 ６…汚泥返送管 １０…循環装置 １０ａ…吸引部
１０ｂ…噴出部 １１…ポンプ １２…主配管
１３…エジェクター機構 １４…縮流部 １５…通気管
１６…副流入管 ｒ…外筒の半径P, Q ... Vertical aeration tank 1 ... Outer cylinder (or tank body) 1a ...
Tank bottom part 1b ... Tank peripheral wall 2 ... Inner cylinder 2a ... Inflow opening 3 ... Outflow part 5 ... Sewage supply pipe 6 ... Sludge return pipe 10 ... Circulation device 10a ... Suction part 10b ... Spouting part 11 ... Pump 12 ... Main pipe 13 ... Ejector Mechanism 14 ... Constriction part 15 ... Ventilation pipe 16 ... Sub-inflow pipe r ... Radius of outer cylinder
Claims (2)
筒状の縦型曝気槽であって、当該曝気槽内の流体を吸引
してこれを当該曝気槽内へ噴出する循環装置が設けら
れ、当該循環装置は、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、当該循環装置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
する縦型曝気槽。1. A cylindrical vertical aeration tank having a sewage supply part and a treated water outflow part, which circulates a fluid in the aeration tank and ejects the fluid into the aeration tank. The 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, and the ejection direction of the circulation device is a direction in which the fluid can swirl in the tank. Vertical aeration tank characterized by being set.
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、当該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循環装置とからなる縦型曝気
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、当該循環装置の噴出方
向は流体を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縦型曝気槽。2. An outer cylinder provided with a sewage water supply part and a treated water outflow part, an inner cylinder concentrically arranged with the outer cylinder and having an inflow opening in the upper part, and sucking fluid in the inner cylinder. A vertical aeration tank consisting of a circulation device for ejecting the same between the outer cylinder and the inner cylinder, wherein the inflow opening of the inner cylinder is located below the outflow portion of the outer cylinder, The 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, and the ejection direction of the circulation device is such that the fluid can swirl between the outer cylinder and the inner cylinder. Vertical aeration tank characterized by being set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3295280A JPH0515893A (en) | 1991-05-09 | 1991-08-22 | Vertical type aeration tank |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3-201553 | 1991-05-09 | ||
| JP20155391 | 1991-05-09 | ||
| JP3295280A JPH0515893A (en) | 1991-05-09 | 1991-08-22 | Vertical type aeration tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0515893A true JPH0515893A (en) | 1993-01-26 |
Family
ID=26512859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3295280A Pending JPH0515893A (en) | 1991-05-09 | 1991-08-22 | Vertical type aeration tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0515893A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11319882A (en) * | 1998-05-11 | 1999-11-24 | Oppenheimer Technology Japan:Kk | Treatment of oil-containing waste water and treating device |
| KR100358962B1 (en) * | 1999-09-04 | 2002-11-01 | 박윤규 | Processing unit of soil and waste water using u-type aeration tank |
| JP2008508095A (en) * | 2004-08-03 | 2008-03-21 | エケロス，ラルス | Processes and reactors for enhanced energy efficient biological (waste) water treatment |
| JP2010094566A (en) * | 2008-10-14 | 2010-04-30 | Kubota Kankyo Service Kk | Aerator and waste water treatment equipment |
| CN103071444A (en) * | 2013-01-30 | 2013-05-01 | 北京工商大学 | Gas-liquid reaction device |
| JPWO2018229912A1 (en) * | 2017-06-14 | 2020-04-16 | 新明和工業株式会社 | Sewage treatment equipment |
| CN111847791A (en) * | 2020-07-29 | 2020-10-30 | 中生源(海南)生态环境发展有限公司 | Deep well ecological pond |
Citations (2)
| 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 |
| JPH02135196A (en) * | 1988-11-16 | 1990-05-24 | Kubota Ltd | Sewage and waste water treating device |
-
1991
- 1991-08-22 JP JP3295280A patent/JPH0515893A/en active Pending
Patent Citations (2)
| 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 |
| JPH02135196A (en) * | 1988-11-16 | 1990-05-24 | Kubota Ltd | Sewage and waste water treating device |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11319882A (en) * | 1998-05-11 | 1999-11-24 | Oppenheimer Technology Japan:Kk | Treatment of oil-containing waste water and treating device |
| KR100358962B1 (en) * | 1999-09-04 | 2002-11-01 | 박윤규 | Processing unit of soil and waste water using u-type aeration tank |
| JP2008508095A (en) * | 2004-08-03 | 2008-03-21 | エケロス，ラルス | Processes and reactors for enhanced energy efficient biological (waste) water treatment |
| JP2010094566A (en) * | 2008-10-14 | 2010-04-30 | Kubota Kankyo Service Kk | Aerator and waste water treatment equipment |
| CN103071444A (en) * | 2013-01-30 | 2013-05-01 | 北京工商大学 | Gas-liquid reaction device |
| CN103071444B (en) * | 2013-01-30 | 2014-12-10 | 北京工商大学 | Gas-liquid reaction device |
| JPWO2018229912A1 (en) * | 2017-06-14 | 2020-04-16 | 新明和工業株式会社 | Sewage treatment equipment |
| CN111847791A (en) * | 2020-07-29 | 2020-10-30 | 中生源(海南)生态环境发展有限公司 | Deep well ecological pond |
| CN111847791B (en) * | 2020-07-29 | 2023-03-10 | 中生源(海南)生态环境发展有限公司 | Deep well ecological pond |
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