JP2019136633A - Stirring device - Google Patents

Stirring device Download PDF

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JP2019136633A
JP2019136633A JP2018020277A JP2018020277A JP2019136633A JP 2019136633 A JP2019136633 A JP 2019136633A JP 2018020277 A JP2018020277 A JP 2018020277A JP 2018020277 A JP2018020277 A JP 2018020277A JP 2019136633 A JP2019136633 A JP 2019136633A
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liquid
stirring device
carrier
treatment tank
blade
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JP7468984B2 (en
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好一 加藤
Koichi Kato
好一 加藤
孝宏 根本
Takahiro Nemoto
孝宏 根本
健一 吾郷
Kenichi Ago
健一 吾郷
太一 山本
Taichi Yamamoto
太一 山本
井坂　和一
Kazuichi Isaka
和一 井坂
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Organo Corp
Satake Chemical Equipment Mfg Ltd
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Organo Corp
Satake Chemical Equipment Mfg Ltd
Japan Organo Co Ltd
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Abstract

To provide a stirring device configured so that only treated water with no carrier in a treatment tank can be exhausted to the outside.SOLUTION: The stirring device is constituted of: a treatment tank in which liquid with a having carrier can be stored up to a desirable height; a rotary vane provided at a desired depth from the liquid level of the liquid in the treatment tank; a stator vane fixed to a bottom part of the treatment tank and extended radially; and an exhaust port, provided in the treatment tank upper than the rotary vane, through which the liquid in the treatment tank is exhausted to the outside.SELECTED DRAWING: Figure 1

Description

本発明は撹拌装置、特に、微生物や触媒を担持した担体を有する排水などの液体を撹拌しながら生物処理する微生物反応装置などの撹拌装置に関するものである。   The present invention relates to an agitation apparatus, and more particularly to an agitation apparatus such as a microorganism reaction apparatus that performs biological treatment while stirring a liquid such as waste water having a carrier carrying microorganisms or a catalyst.

排水を生物処理するために、排水に微生物や触媒を担持した担体を撹拌して、排水を浄化する方法がある。   In order to biologically treat the wastewater, there is a method of purifying the wastewater by stirring a carrier carrying microorganisms or a catalyst in the wastewater.

図９及び図１０は従来の微生物反応装置などの撹拌装置を示し、１は、撹拌装置、２は、該撹拌装置１の処理槽を示し、該処理槽２は、例えば、有底の円筒状よりなる。   9 and 10 show a stirring device such as a conventional microbial reactor, 1 is a stirring device, 2 is a treatment tank of the stirring device 1, and the treatment tank 2 is, for example, a cylindrical shape with a bottom. It becomes more.

３は、回転翼を示し、該回転翼３は、例えば、前記処理槽２の上部から垂設された回転軸３ａの下端に半径方向に放射状に固定される。   Reference numeral 3 denotes a rotating blade, and the rotating blade 3 is radially fixed to a lower end of a rotating shaft 3a suspended from an upper portion of the processing tank 2, for example.

前記回転翼３は、例えば、４枚のフラットパドル翼などの矩形板状の翼板からなり、モータ等の駆動手段（図示せず）により前記回転軸３ａを介して、前記処理槽２内に所望の高さまで容れられた液体内の上部、例えば、液面の近傍において回転するように設けられている。   The rotary blade 3 is composed of, for example, a rectangular blade plate such as four flat paddle blades, and is placed in the processing tank 2 via the rotary shaft 3a by a driving means (not shown) such as a motor. It is provided to rotate in the upper part of the liquid contained up to a desired height, for example, in the vicinity of the liquid level.

４は、静翼を示し、該静翼４は、例えば、４枚の複数の直線状の帯状板からなり、前記回転翼３の下方の前記処理槽２の底部２ａの中心に放射状に等角度に離間して固定される。   Reference numeral 4 denotes a stationary blade. The stationary blade 4 is composed of, for example, a plurality of linear strips of four sheets, and is radially equiangular at the center of the bottom 2a of the processing tank 2 below the rotary blade 3. It is fixed to be separated.

また、前記各帯状板は、例えば、図１０に示すように、該帯状板の交差部に相当する前記帯状体の中心部は互に間隙５を有すると共に、該各帯状板は、例えば、前記回転翼３の回転方向の前方（又は後方）で、前記底部２ａの中心を通る半径線Ｒから間隔ｄを開けて並行に固定されている。   Further, for example, as shown in FIG. 10, the center portions of the strips corresponding to the intersecting portions of the strip plates have a gap 5 therebetween, and the strip plates are, for example, At the front (or rear) of the rotating blade 3 in the rotational direction, the rotary blades 3 are fixed in parallel with a gap d from the radial line R passing through the center of the bottom 2a.

６は、流入管を示し、該流入管６は、例えば、前記処理槽２の側壁の下部に設けられ、処理すべき処理水などの液体を前記処理槽２内に容れるように設けられている。   Reference numeral 6 denotes an inflow pipe. The inflow pipe 6 is provided, for example, in a lower portion of the side wall of the processing tank 2 so as to contain a liquid such as processing water to be processed in the processing tank 2. .

７は、排出口を示し、該排出口７は、前記処理槽２の側壁の中間部に設けられ、該排出口７には、処理槽２内の担体が外部に排出されないように、担体分離部（図示せず）が設けられている。   Reference numeral 7 denotes a discharge port. The discharge port 7 is provided at an intermediate portion of the side wall of the processing tank 2, and the carrier is separated from the discharge port 7 so that the carrier in the processing tank 2 is not discharged to the outside. A portion (not shown) is provided.

前記従来の撹拌装置においては、微生物や触媒などを担持した担体を有する処理水などの液体を、前記処理槽２内に所望の高さまで流入させて、前記回転翼３を回転させることにより、前記処理槽２内の処理水は、図９に示すように、前記回転翼３により、前記処理槽２の側壁内面を旋回して旋回しながら緩やかに槽底部に向かう下降流Ｐを形成し、その後、前記処理槽２の中心部の底部において、前記静翼４により、強力な竜巻上昇流Ｑを引き起こし、これにより、前記回転翼３と前記静翼６との間で循環流が形成され、処理槽２内で液体の混合・均一分散化を図ることができるようになる。   In the conventional stirring device, a liquid such as treated water having a carrier carrying microorganisms or a catalyst is allowed to flow into the treatment tank 2 to a desired height, and the rotating blade 3 is rotated, thereby As shown in FIG. 9, the treated water in the treatment tank 2 forms a downward flow P gently toward the tank bottom while turning around the inner surface of the side wall of the treatment tank 2 by the rotary blades 3. At the bottom of the central portion of the treatment tank 2, the stationary blade 4 causes a strong tornado upflow Q, thereby forming a circulating flow between the rotating blade 3 and the stationary blade 6 and processing. The liquid can be mixed and uniformly dispersed in the tank 2.

また、生物処理された処理水は、前記排出口７を通じて、前記担体分離部に流れ、処理水に含まれる担体は前記担体分離部内で下方に沈下し、排出口７から処理槽２内に戻され、担体のない処理水のみを、外部に排出されるようになる。   Also, the biologically treated treated water flows to the carrier separation part through the discharge port 7, and the carrier contained in the treated water sinks downward in the carrier separation part and returns to the treatment tank 2 from the discharge port 7. Only treated water without a carrier is discharged to the outside.

特開２０００−２４６２６９号公報JP 2000-246269 A 特開２０１２−３０１５５号公報JP2012-30155A

しかしながら、担体の処理槽外への抜け防止に、別途担体分離部などが必要で、構成が複雑となっていた。   However, in order to prevent the carrier from slipping out of the treatment tank, a separate carrier separation unit or the like is required, and the configuration is complicated.

本発明は、簡単な構成で、担体等の処理槽外部への排出を防止できる撹拌装置を提供することを目的とする。   An object of this invention is to provide the stirring apparatus which can prevent discharge | emission to the exterior of a processing tank with a simple structure.

前記の目的を達成すべく、本発明の撹拌装置は、担体を有する液体が所望の高さまで容れられる処理槽と、該処理槽内において、前記液体の液面から所望の深さに設けられた回転翼と、前記処理槽の底部に固定された放射状に延びる静翼と、前記回転翼よりも上方の前記処理槽に設けられた、処理槽内の液体を外部に排出する排出管とよりなることを特徴とする。   In order to achieve the above object, the stirring device of the present invention is provided at a desired depth from the liquid surface of the liquid in the treatment tank in which the liquid having the carrier is contained up to a desired height. A rotating blade, a radially extending stationary blade fixed to the bottom of the processing tank, and a discharge pipe provided in the processing tank above the rotating blade for discharging the liquid in the processing tank to the outside. It is characterized by that.

また、前記所望の深さは、前記回転翼の上方で、前記処理槽内に容れられた液体のうち、該回転翼の回転の影響を受けない液体部分が形成される深さであることを特徴とする。   Further, the desired depth is a depth at which a liquid portion that is not affected by the rotation of the rotor blade is formed in the liquid contained in the processing tank above the rotor blade. Features.

また、前記所望の深さは、前記液面から、液体深さの１／３よりも下であることを特徴とする。   The desired depth is lower than 1/3 of the liquid depth from the liquid surface.

また、前記所望の深さは、前記液面から、液体深さの１／２よりも下であることを特徴とする。   Further, the desired depth is lower than 1/2 of the liquid depth from the liquid surface.

また、前記回転翼の上端に板体を固定したことを特徴とする。   Further, a plate body is fixed to the upper end of the rotary blade.

また、前記液面より下で、前記回転翼の上方の前記撹拌槽の側壁の内周面に、周方向に、邪魔板を固定したことを特徴とする。   Further, a baffle plate is fixed in the circumferential direction on the inner peripheral surface of the side wall of the stirring tank below the liquid surface and above the rotary blade.

また、前記邪魔板は、リング状板であることを特徴とする。   The baffle plate is a ring-shaped plate.

本発明によれば、簡単な構成で、担体の槽内混合・均一分散化が得られると共に、担体が排水処理系から系外に流出することを防止できる効果を有する。   According to the present invention, the carrier can be mixed and uniformly dispersed in the tank with a simple structure, and the carrier can be prevented from flowing out of the wastewater treatment system.

本発明の実施例１の撹拌装置の縦断側面図である。It is a vertical side view of the stirring apparatus of Example 1 of this invention. 図１のＡ−Ａ線断面図である。It is the sectional view on the AA line of FIG. 本発明の実施例２の撹拌装置の斜視図である。It is a perspective view of the stirring apparatus of Example 2 of this invention. 本発明の実施例２の撹拌装置の縦断側面図である。It is a vertical side view of the stirring apparatus of Example 2 of this invention. 図４のＢ−Ｂ線断面図である。It is the BB sectional view taken on the line of FIG. 本発明の実施例３の撹拌装置の斜視図である。It is a perspective view of the stirring apparatus of Example 3 of this invention. 本発明の実施例３の撹拌装置の縦断側面図である。It is a vertical side view of the stirring apparatus of Example 3 of this invention. 図７のＣ−Ｃ線断面図である。It is CC sectional view taken on the line of FIG. 従来の撹拌装置の縦断側面図である。It is a vertical side view of the conventional stirring apparatus. 図９のＤ−Ｄ線断面図である。FIG. 10 is a sectional view taken along line D-D in FIG. 9.

本発明を実施するための形態の実施例を以下に示す。なお、前記従来例と同じ部分には、同じ符号を付け、説明を省略する。   The example of the form for carrying out the present invention is shown below. In addition, the same code | symbol is attached | subjected to the same part as the said prior art example, and description is abbreviate | omitted.

本発明の実施例１を図１及び図２によって説明する。   A first embodiment of the present invention will be described with reference to FIGS.

本発明の撹拌装置８においては、前記従来の撹拌装置１において、前記処理槽２の排出口７に担体分離部を設ける代わりに、前記回転軸３ａを前記処理槽２内の下方に伸ばし、該回転軸３ａの下端に固定された前記回転翼３を、前記処理槽２内に容れられた処理水の液面から所望の深さにおいて回転するように設けると共に、前記回転翼３の上方で、液面より下の前記処理槽２の側壁に排出口９を設ける。   In the stirring device 8 of the present invention, in the conventional stirring device 1, instead of providing a carrier separating portion at the discharge port 7 of the processing tank 2, the rotating shaft 3a extends downward in the processing tank 2, The rotary blade 3 fixed to the lower end of the rotary shaft 3a is provided so as to rotate at a desired depth from the surface of the treated water contained in the treatment tank 2, and above the rotary blade 3, A discharge port 9 is provided on the side wall of the processing tank 2 below the liquid level.

なお、前記液面からの所望の深さとは、前記処理槽２内に所望（規定）の高さまで処理水などの液体を容れ、前記回転翼を回転させた時に、前記回転翼３よりも上方で、該回転翼の回転の影響を受けない液体部分１０（以下、「無担体ゾーン１０」という）を形成できる深さを意味し、該深さは、撹拌槽２と回転翼３と静翼４の形状や、回転翼３の回転数や、処理水や担体の種類などにより影響を受けるが、例えば、液面から、液体深さの１／３よりも下の位置、好ましくは、液体深さの１／２よりも下の位置に設けられる。   The desired depth from the liquid surface means that the treatment tank 2 is filled with a liquid such as treated water up to a desired (specified) height, and is higher than the rotary blade 3 when the rotary blade is rotated. The depth at which the liquid portion 10 (hereinafter referred to as “carrier-free zone 10”) that is not affected by the rotation of the rotor blades can be formed. 4, the number of rotations of the rotor 3, the type of treated water and the carrier, etc., but for example, from the liquid level to a position lower than 1/3 of the liquid depth, preferably the liquid depth It is provided at a position below 1/2 of the height.

なお、前記液体を排出口９は、前記無担体ゾーン１０に位置する前記処理槽２の側壁部分に形成される。   The liquid discharge port 9 is formed in a side wall portion of the processing tank 2 located in the carrier-free zone 10.

次に、前記実施例１の撹拌装置による処理方法と効果を説明する。   Next, the processing method and effect by the stirring apparatus of Example 1 will be described.

前記流入管６より、微生物や触媒などを担持した担体を有する処理水などの液体を、前記処理槽２内に所望の高さまで流入させて、前記液体を前記処理槽２内に貯めるようにする。   From the inflow pipe 6, a liquid such as treated water having a carrier carrying microorganisms or a catalyst is allowed to flow into the processing tank 2 to a desired height, and the liquid is stored in the processing tank 2. .

前記回転翼３を回転させることにより、前記処理槽２内において、担体を有する処理水は、図１に示すように、前記回転翼３により、半径方向外側に吐出されて処理槽２の側壁内面に当接して下方に流れて、前記処理槽２の側壁内面を旋回しながら緩やかに処理槽２の底部２ａに向かう下降流が形成され、その後、該処理槽２の中心部の底部において、前記静翼４により、強力な竜巻上昇流を引き起こし、これにより、前記回転翼３と前記静翼６との間において、循環流が形成され、前記処理槽２内で処理水の混合・均一分散化を図ることができるようになる。   By rotating the rotary blade 3, the treated water having a carrier in the treatment tank 2 is discharged radially outward by the rotary blade 3 as shown in FIG. And a downward flow toward the bottom 2a of the processing tank 2 is formed while swirling the inner surface of the side wall of the processing tank 2, and thereafter the bottom of the central part of the processing tank 2 The stationary blade 4 causes a strong tornado ascending flow, whereby a circulating flow is formed between the rotary blade 3 and the stationary blade 6, and the treated water is mixed and uniformly dispersed in the treatment tank 2. Can be planned.

また、前記回転翼３による吐出流のほとんど影響のない、該回転翼３の上方に無担体ゾーン１０が形成され、該無担体ゾーンの処理水が、前記排出口７から排出されるので、担体のない反応後の処理水を、処理槽外に引き抜き排出できるようになる。   In addition, a carrier-free zone 10 is formed above the rotor blade 3 that is hardly affected by the discharge flow of the rotor blade 3, and treated water in the carrier-free zone is discharged from the discharge port 7. The treated water without reaction can be drawn out of the treatment tank and discharged.

従って、簡単な構成で、担体の槽内混合・均一分散化が得られると共に、担体が排水処理系から系外に流出することを防止できる効果を有する。   Accordingly, the carrier can be mixed and uniformly dispersed in the tank with a simple configuration, and the carrier can be prevented from flowing out of the wastewater treatment system.

本発明の実施例２において、図３〜図５に示すように、実施例１の撹拌装置８において、前記回転翼３の上端に円板などの板体１１を固定する。   In the second embodiment of the present invention, as shown in FIGS. 3 to 5, a plate body 11 such as a disk is fixed to the upper end of the rotary blade 3 in the stirring device 8 of the first embodiment.

前記板体１１は、例えば、その中心が前記回転軸３ａと一致した円板であり、前記回転翼３の径と同じあるいは、それ以上の径の円板で形成されると共に、板体縁部と前記処理槽２の側壁内面との間に隙間が形成される大きさに形成される。   The plate body 11 is, for example, a disc whose center coincides with the rotary shaft 3a, and is formed of a disc having a diameter equal to or larger than the diameter of the rotary blade 3, and a plate body edge portion. And a size that forms a gap between the inner surface of the side wall of the treatment tank 2.

本発明の第２実施例によれば、前記板体１１により、前記回転翼３の上方の無担体ゾーン１０への担体の侵入を確実に少なくすることができるようになる。   According to the second embodiment of the present invention, the plate 11 can surely reduce the intrusion of the carrier into the carrier-free zone 10 above the rotor blade 3.

また、前記板体１１を設けることにより、前記回転翼２の上方に無担体ゾーン１０を形成しやすくなるため、例えば、前記実施例１に比べて、前記回転翼３の位置を高い位置に設けることができるようになる。   Further, by providing the plate body 11, it becomes easy to form the carrier-free zone 10 above the rotor blade 2. For example, the rotor blade 3 is provided at a higher position than the first embodiment. Will be able to.

本発明の実施例３は、図６〜図８に示すように、前記実施例１または実施例２の撹拌装置において、前記回転翼３の上方でかつ液面よりも下方の前記処理槽２の側壁の内周面に、周方向に、例えば、リング状板１２などの邪魔板を固定する。   As shown in FIGS. 6 to 8, Embodiment 3 of the present invention is the stirring device of Embodiment 1 or Embodiment 2 above the rotor 3 and below the liquid level in the processing tank 2. For example, a baffle plate such as the ring-shaped plate 12 is fixed to the inner peripheral surface of the side wall in the circumferential direction.

前記リング状板１２は、例えば、該処理槽２の内径と同じ外径のリング状の板が前記処理槽２の側壁内の全周に渡って水平に固定された板体であり、該板体の中心部には、例えば、円状の開口部１２ａが形成される。   The ring-shaped plate 12 is, for example, a plate body in which a ring-shaped plate having the same outer diameter as the inner diameter of the processing tank 2 is horizontally fixed over the entire circumference in the side wall of the processing tank 2. For example, a circular opening 12a is formed in the center of the body.

なお、前記開口部１２ａの大きさは、例えば、前記回転翼２の径よりも大きく形成する。また、例えば、前記板体１１よりも大きく形成する。   The size of the opening 12a is formed larger than the diameter of the rotor blade 2, for example. Further, for example, it is formed larger than the plate body 11.

本発明の第３の実施例によれば、前記リング状板１２により、前記回転翼３により半径方向外方に吐出され、前記処理槽２の側壁の内面に当接した処理水が、上方に向かうのを阻止することができ、前記回転翼３の上方の無担体ゾーン１０への担体の侵入を更に確実に少なくすることができるようになる。   According to the third embodiment of the present invention, the treated water which is discharged radially outward by the rotary blade 3 by the ring-shaped plate 12 and abuts against the inner surface of the side wall of the treatment tank 2 is directed upward. Therefore, it is possible to prevent the carrier from entering the carrier-free zone 10 above the rotor blade 3 more reliably.

また、前記リング状板１２を設けることにより、前記回転翼３の上方に無担体ゾーン１０を更に形成しやすくなるため、例えば、前記実施例１や実施例２に比べて、前記回転翼３の位置を高い位置に設けることができるようになる。   Further, by providing the ring-shaped plate 12, it becomes easier to form the carrier-free zone 10 above the rotor blade 3. For example, compared to the first embodiment and the second embodiment, The position can be provided at a high position.

本発明の撹拌装置は、嫌気処理や、好気処理や、脱窒・硝化処理などでも活用することができ、用途も電子産業、食品、畜産、農業、オフィス、下水など、産業排水や生活排水において利用可能である。   The stirrer of the present invention can be used for anaerobic treatment, aerobic treatment, denitrification / nitrification treatment, etc., and uses are also industrial wastewater and domestic wastewater such as electronics industry, food, livestock, agriculture, office, sewage, etc. Is available in

１ 撹拌装置
２ 処理槽
２ａ 底部
３ 回転翼
３ａ 回転軸
４ 静翼
５ 間隙
６ 流入管
７ 排出口
８ 撹拌装置
９ 排出口
１０ 無担体ゾーン
１１ 板体
１２ リング状板
１２ａ 開口部

DESCRIPTION OF SYMBOLS 1 Stirring apparatus 2 Processing tank 2a Bottom part 3 Rotor blade 3a Rotating shaft 4 Stator blade 5 Gap 6 Inlet pipe 7 Discharge port 8 Stirrer 9 Discharge port 10 Carrier-free zone 11 Plate body 12 Ring-shaped plate 12a Opening

Claims (7)

担体を有する液体が所望の高さまで容れられる処理槽と、
該処理槽内において、前記液体の液面から所望の深さに設けられた回転翼と、
前記処理槽の底部に固定された放射状に延びる静翼と、
前記回転翼よりも上方の前記処理槽に設けられた、処理槽内の液体を外部に排出する排出口とよりなることを特徴とする撹拌装置。 A treatment tank in which a liquid having a carrier is filled to a desired height;
In the treatment tank, a rotary blade provided at a desired depth from the liquid surface;
A radially extending stationary blade fixed to the bottom of the treatment tank;
An agitation apparatus comprising: a discharge port provided in the processing tank above the rotary blade and configured to discharge the liquid in the processing tank to the outside. 前記所望の深さは、前記回転翼の上方で、前記処理槽内に容れられた液体のうち、該回転翼の回転の影響を受けない液体部分が形成される深さであることを特徴とする請求項１に記載の撹拌装置。   The desired depth is a depth at which a liquid portion that is not affected by the rotation of the rotor blade is formed in the liquid stored in the processing tank above the rotor blade. The stirring device according to claim 1. 前記所望の深さは、前記液面から、液体深さの１／３よりも下であることを特徴とする請求項１に記載の撹拌装置。   The stirring device according to claim 1, wherein the desired depth is lower than 1/3 of the liquid depth from the liquid surface. 前記所望の深さは、前記液面から、液体深さの１／２よりも下であることを特徴とする請求項１に記載の撹拌装置。   The stirring device according to claim 1, wherein the desired depth is lower than ½ of the liquid depth from the liquid surface. 前記回転翼の上端に板体を固定したことを特徴とする請求項１乃至４のいずれか１に記載の撹拌装置。   The stirring device according to any one of claims 1 to 4, wherein a plate body is fixed to an upper end of the rotary blade. 前記液面より下で、前記回転翼の上方の前記撹拌槽の側壁の内周面に、周方向に、邪魔板を固定したことを特徴とする請求項１乃至５のいずれか１に記載の撹拌装置。   6. The baffle plate according to claim 1, wherein a baffle plate is fixed in a circumferential direction on an inner peripheral surface of a side wall of the stirring tank above the rotary blade below the liquid surface. Stirring device. 前記邪魔板は、リング状板であることを特徴とする請求項６に記載の撹拌装置。   The stirring device according to claim 6, wherein the baffle plate is a ring-shaped plate.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5614694U (en) * 1979-07-16 1981-02-07
JP2002143889A (en) * 2000-11-10 2002-05-21 Nec Ameniplantex Ltd Waste water treatment equipment
JP2004188413A (en) * 2002-11-25 2004-07-08 Taiho Ind Co Ltd Denitrification method and denitrification apparatus of waste water and stirring apparatus therefor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000254682A (en) 1999-03-12 2000-09-19 Suido Kiko Kaisha Ltd Biological reactor
JP5190529B2 (en) 2006-04-21 2013-04-24 前澤工業株式会社 Wastewater treatment equipment
JP5614694B1 (en) 2013-12-27 2014-10-29 株式会社浅井建築設計事務所 Storage device
DE102016013071A1 (en) 2016-06-28 2017-12-28 Hans-Joachim Boltersdorf Device for treating material with a container

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5614694U (en) * 1979-07-16 1981-02-07
JP2002143889A (en) * 2000-11-10 2002-05-21 Nec Ameniplantex Ltd Waste water treatment equipment
JP2004188413A (en) * 2002-11-25 2004-07-08 Taiho Ind Co Ltd Denitrification method and denitrification apparatus of waste water and stirring apparatus therefor

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