JPH10290999A - Agitator of digestion tank - Google Patents

Agitator of digestion tank

Info

Publication number
JPH10290999A
JPH10290999A JP10442097A JP10442097A JPH10290999A JP H10290999 A JPH10290999 A JP H10290999A JP 10442097 A JP10442097 A JP 10442097A JP 10442097 A JP10442097 A JP 10442097A JP H10290999 A JPH10290999 A JP H10290999A
Authority
JP
Japan
Prior art keywords
draft tube
digestion tank
sludge
tube
circulating flow
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
Application number
JP10442097A
Other languages
Japanese (ja)
Inventor
Kenji Kamimura
健二 上村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP10442097A priority Critical patent/JPH10290999A/en
Publication of JPH10290999A publication Critical patent/JPH10290999A/en
Pending legal-status Critical Current

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  • Mixers Of The Rotary Stirring Type (AREA)
  • Treatment Of Sludge (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)

Abstract

PROBLEM TO BE SOLVED: To circulate a sludge even around a draft tube and to sufficiently agitate the sludge in a digestion tank by providing plural branch pipes directed obliquely upward or downward close to the center of the draft tube contg. an agitator in its vertical direction. SOLUTION: Plural branch pipes 13 are provided close to the center of a draft tube 10 in its vertical direction almost at regular intervals in the circumferential direction of the tube 10 and directed obliquely upward. A screw 19 is rotated to generate an upward flow, and a large circulating flow A is developed in a digestion tank 1. Meanwhile, a part of the upward flow in the tube 10 is introduced into the branch pipe 13 to generate a small circulating flow (a). Whereas the large circulating flow A circulates mainly along the inner wall of the digestion tank 1, the small circulating flow (a) circulates around the tube 10. Consequently, a sludge 30 is not retained around the tube 10, and the sludge 30 is sufficiently agitated throughout the entire digestion tank 1.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、汚泥の嫌気性処理
に用いられる消化槽の攪拌装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digestion tank stirring device used for anaerobic treatment of sludge.

【0002】[0002]

【従来の技術】従来の消化槽の攪拌装置の一例として、
特公昭59−46654号公報(以下従来技術1とい
う)に記載されたものがある。図3はこのような装置の
全体構成を示す縦断面図である。図において、1は断面
ほぼ楕円形状の消化槽で、上部には汚泥30の投入口2
が設けられている。10は消化槽1の中心部に立設状態
で据付けられたドラフトチューブで、下部は複数の脚部
11により消化槽1の内壁に固定されており、上部は複
数のターンバックル12等により消化槽1の内壁に固定
されている。
2. Description of the Related Art As an example of a conventional digester stirring device,
There is one described in Japanese Patent Publication No. 59-46654 (hereinafter referred to as prior art 1). FIG. 3 is a longitudinal sectional view showing the overall configuration of such an apparatus. In the figure, reference numeral 1 denotes a digestion tank having a substantially elliptical cross section.
Is provided. Reference numeral 10 denotes a draft tube which is installed upright at the center of the digester 1, and a lower portion is fixed to an inner wall of the digester 1 by a plurality of legs 11, and an upper portion is provided by a plurality of turnbuckles 12 and the like. 1 is fixed to the inner wall.

【0003】15は消化槽1の上部に設けられた攪拌機
で、ドラフトチューブ10の直上においてコンクリート
スラブ3に埋込んで据付けられたベアリングボックス1
6と、このベアリングボックス16の外側(上部)に配
置されたモータ17と、ベアリングボックス16を介し
てモータ17の出力軸に連結されたシャフト18と、シ
ャフト18に接続されたスクリュー19とからなり、ス
クリュー19はドラフトチューブ10の上端開口部内に
挿入されている。30は消化槽1内にその上端部近傍ま
で入れられた汚泥で、ドラフトチューブ10は汚泥30
内に埋没している。
[0005] Reference numeral 15 denotes a stirrer provided at the upper part of the digestion tank 1, and the bearing box 1 embedded and installed in the concrete slab 3 immediately above the draft tube 10.
6, a motor 17 arranged outside (upper part) of the bearing box 16, a shaft 18 connected to the output shaft of the motor 17 via the bearing box 16, and a screw 19 connected to the shaft 18. The screw 19 is inserted into the upper end opening of the draft tube 10. Numeral 30 denotes sludge put into the digestion tank 1 up to the vicinity of the upper end thereof, and the draft tube 10
Buried inside.

【0004】上記のような攪拌装置を備えた消化槽1に
おいては、攪拌機15のモータ17を駆動してスクリュ
ー19を回転させると、ドラフトチューブ10の一端開
口部から汚泥30を吸込み、吸込んだ汚泥を他端開口部
から吐出して、ドラフトチューブ10内に実線で示す下
向き、又は破線で示す上向きの流れを発生させ、これに
より、消化槽1内に強制対流による循環流を発生させ
て、汚泥30を全体的に攪拌する。
In the digestion tank 1 provided with the above-described stirring device, when the motor 17 of the stirrer 15 is driven to rotate the screw 19, the sludge 30 is sucked from one end opening of the draft tube 10, and the sucked sludge is sucked. From the opening at the other end to generate a downward flow indicated by a solid line or an upward flow indicated by a broken line in the draft tube 10, thereby generating a circulating flow by forced convection in the digestion tank 1, and Stir 30 globally.

【0005】図4は特願平6−91937号(以下従来
技術2という)に記載された消化槽の攪拌装置の他の例
を示す断面図である。なお、従来技術1と同じ部分には
これと同じ符号を付し、説明を省略する。4はドラフト
チューブ10の直上において、コンクリートスラブ3に
設置された水封用パイプ、5はその点検口、6は蓋体で
ある。20はドラフトチューブ10内の下方に設置され
た水中攪拌機で、21は保持具23に保持されたモー
タ、22はモータ21の出力軸に接続されたスクリュー
である。このような水中攪拌機20は、水封用パイプ4
の点検口5からドラフトチューブ10内に挿入され、ワ
イヤ等24で吊下げられて所定の位置に設置される。2
5はモータ21に電力を供給するケーブルである。
FIG. 4 is a cross-sectional view showing another example of a digestion tank stirring apparatus described in Japanese Patent Application No. 6-91937 (hereinafter referred to as prior art 2). In addition, the same reference numerals are given to the same portions as the conventional technology 1, and the description is omitted. Reference numeral 4 denotes a water sealing pipe installed on the concrete slab 3 immediately above the draft tube 10, reference numeral 5 denotes an inspection port thereof, and reference numeral 6 denotes a lid. Reference numeral 20 denotes an underwater stirrer installed below the draft tube 10, reference numeral 21 denotes a motor held by a holder 23, and reference numeral 22 denotes a screw connected to an output shaft of the motor 21. Such a submersible agitator 20 includes a water sealing pipe 4
Is inserted into the draft tube 10 through the inspection port 5 and suspended at a predetermined position by wires 24 or the like. 2
Reference numeral 5 denotes a cable for supplying electric power to the motor 21.

【0006】上記のような攪拌装置においても、モータ
21を駆動してスクリュー22を回転させ、ドラフトチ
ューブ10内に下向き又は上向きの汚泥30の流れを発
生させ、これにより、消化槽1内に強制対流による循環
流を発生させて、汚泥30を全体的に攪拌する。
In the above-described stirring apparatus, the motor 21 is driven to rotate the screw 22 to generate a downward or upward flow of sludge 30 in the draft tube 10, thereby forcing the sludge 30 into the digestion tank 1. A circulating flow is generated by convection, and the sludge 30 is totally stirred.

【0007】[0007]

【発明が解決しようとする課題】従来技術1の攪拌装置
は、攪拌機15によって攪拌された消化槽1内の汚泥3
0の循環流が、主として消化槽1の内壁に沿って循環す
るため、ドラフトチューブ10の周辺(消化槽1の中央
部近傍)の汚泥30が循環せず、このため十分攪拌され
ないという問題があった。また、従来技術2の攪拌装置
においても、水中攪拌機20によって攪拌された消化槽
1内の汚泥30の循環流が、従来技術1と同様に主とし
て消化槽1の内壁に沿って循環するため、ドラフトチュ
ーブ10の周辺の汚泥30が循環せず、十分攪拌されな
いという問題があった。
The agitating device according to the prior art 1 comprises a sludge 3 in the digester 1 stirred by a stirrer 15.
Since the circulating flow of 0 mainly circulates along the inner wall of the digester 1, the sludge 30 around the draft tube 10 (near the center of the digester 1) does not circulate, and therefore, there is a problem that it is not sufficiently stirred. Was. Also in the stirring device of the prior art 2, the circulating flow of the sludge 30 in the digestion tank 1 stirred by the underwater stirrer 20 circulates mainly along the inner wall of the digestion tank 1 as in the prior art 1, so that the draft is drafted. There is a problem that the sludge 30 around the tube 10 does not circulate and is not sufficiently stirred.

【0008】本発明は、上記の課題を解決すべくなされ
たもので、ドラフトチューブの周辺にも汚泥を循環させ
ることにより、消化槽内の汚泥を十分攪拌することので
きる消化槽の攪拌装置を得ることを目的としたものであ
る。
[0008] The present invention has been made to solve the above-mentioned problems, and an apparatus for agitating a digestion tank capable of sufficiently stirring the sludge in the digestion tank by circulating the sludge also around the draft tube. It is intended to obtain.

【0009】[0009]

【課題を解決するための手段】[Means for Solving the Problems]

(1)本発明に係る消化槽の攪拌装置は、消化槽内に立
設されたドラフトチューブと、該ドラフトチューブ内に
少なくとも攪拌用のスクリューが挿入された攪拌機とを
有し、前記ドラフトチューブの上下方向の少なくとも中
間部近傍に斜め上方又は斜め下方に向けた複数の枝管を
設けたものである。
(1) The digester tank agitator according to the present invention includes a draft tube erected in the digester tank, and a stirrer in which at least a stirring screw is inserted in the draft tube. A plurality of branch pipes directed diagonally upward or diagonally downward are provided at least in the vicinity of the middle part in the vertical direction.

【0010】(2)また、上記(1)の枝管を斜め上方
又は斜め下方に向けた螺旋状に形成したものである。
(2) Further, the branch pipe of the above (1) is formed in a spiral shape obliquely upward or downward.

【0011】[0011]

【発明の実施の形態】BEST MODE FOR CARRYING OUT THE INVENTION

実施形態1 図1は本発明に係る消化槽の攪拌装置の実施形態1の縦
断面図である。なお、図3の従来技術と同じ部分にはこ
れと同じ符号を付し、説明を省略する。図において、1
3はドラフトチューブ10の上下方向の中間部近傍に設
けた複数の枝管で、ドラフトチューブ10の円周方向に
ほぼ等間隔で、かつ、斜め上向きに設けたものである。
Embodiment 1 FIG. 1 is a longitudinal sectional view of Embodiment 1 of the digester tank agitator according to the present invention. The same parts as those of the prior art in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. In the figure, 1
Reference numeral 3 denotes a plurality of branch pipes provided in the vicinity of an intermediate portion of the draft tube 10 in the vertical direction, which are provided at substantially equal intervals in the circumferential direction of the draft tube 10 and obliquely upward.

【0012】上記のような攪拌装置において、モータ1
7を駆動してスクリュー19を回転すると、ドラフトチ
ューブ10内に上向きの流れが生じ、消化槽1内に強制
対流により大きな循環流Aが発生する。また、ドラフト
チューブ10内の上向きの流れの一部は、枝管13に分
流して小さな循環流aが生じる。この小さな循環流aは
大きな循環流Aに合流し、ドラフトチューブ10の下端
開口部から吸込まれ、再びドラフトチューブ10内を流
れる。
In the above-described stirring device, the motor 1
When the screw 7 is rotated by driving the 7, an upward flow is generated in the draft tube 10, and a large circulation flow A is generated in the digestion tank 1 by forced convection. A part of the upward flow in the draft tube 10 is divided into the branch pipe 13 to generate a small circulation flow a. This small circulation flow a merges with the large circulation flow A, is sucked through the lower end opening of the draft tube 10, and flows through the draft tube 10 again.

【0013】このようにして、大きな循環流Aが主とし
て消化槽1の内壁に沿って循環するのに対し、小さい循
環流aはドラフトチューブ10の周辺を通る循環流を生
じさせる。このため、消化槽1内のドラフトチューブ1
0の周辺に汚泥30が滞留することなく、消化槽1の全
体にわたって汚泥30の攪拌が十分に行われる。
In this way, the large circulating flow A circulates mainly along the inner wall of the digester 1 while the small circulating flow a produces a circulating flow around the draft tube 10. Therefore, the draft tube 1 in the digester 1
The sludge 30 is sufficiently stirred throughout the digestion tank 1 without the sludge 30 staying around zero.

【0014】実施例では、長さ15m、内径50cmの
ドラフトチューブ10の上下方向の中間部に、長さ50
cm、内径25cm、ドラフトチューブ10との角度θ
が30°の枝管13を2本設けた。これにより、実機を
操業したところ、消化槽1のドラフトチューブ10の周
辺(中央部近傍)に汚泥30が滞留することなく、消化
槽1の全体にわたって汚泥30を十分に攪拌することが
できた。なお、実験の結果によれば、枝管13の内径は
ドラフトチューブ10の内径の0.4〜0.6程度、ま
た、枝管13のドラフトチューブ10に対する角度θは
20°〜40°程度が望ましいことがわかった。
In the embodiment, a draft tube 10 having a length of 15 m and an inner diameter of 50 cm is provided at a vertically intermediate portion in a vertical direction.
cm, inner diameter 25 cm, angle θ with draft tube 10
Provided two branch pipes 13 of 30 °. Thereby, when the actual machine was operated, the sludge 30 could be sufficiently stirred throughout the digester 1 without the sludge 30 remaining around the draft tube 10 of the digester 1 (near the center). According to the results of the experiment, the inner diameter of the branch pipe 13 is about 0.4 to 0.6 of the inner diameter of the draft tube 10, and the angle θ of the branch pipe 13 with respect to the draft tube 10 is about 20 ° to 40 °. It turned out to be desirable.

【0015】実施形態2 図2は本発明の実施形態2の要部を示す平断面図であ
る。本実施形態においては、ドラフトチューブ10の上
下方向の中間部近傍において、複数の枝管13aをほぼ
等間隔で、螺旋状かつ斜め上向きに設けたものである。
Second Embodiment FIG. 2 is a plan sectional view showing a main part of a second embodiment of the present invention. In the present embodiment, a plurality of branch pipes 13a are provided spirally and obliquely upward at substantially equal intervals in the vicinity of an intermediate portion of the draft tube 10 in the vertical direction.

【0016】上記のような攪拌装置において、スクリュ
ー19の回転によって生じたドラフトチューブ10内の
上向きの流れの一部は、枝管13aに分流して小さな循
環流aを生じるが、枝管13aが螺旋状に斜め上方に向
いているため、汚泥30はドラフトチューブ10の周囲
を旋回しながら上昇する。そして、旋回上昇しながら形
成された小さな循環流aは大きな循環流Aに合流し、再
びドラフトチューブ10内を流れる。
In the above-described stirring device, a part of the upward flow in the draft tube 10 generated by the rotation of the screw 19 is diverted to the branch pipe 13a to generate a small circulating flow a. The sludge 30 rises while swirling around the draft tube 10 because it is spirally inclined obliquely upward. Then, the small circulating flow a formed while swirling and rising joins the large circulating flow A, and flows through the draft tube 10 again.

【0017】本実施形態によれば、枝管13aから分流
した小さな循環流aは、ドラフトチューブ10の周辺を
旋回上昇しながら大きな循環流Aに合流するので、ドラ
フトチューブ10の周辺に汚泥30が滞留することがな
く、消化槽1の全体にわたって汚泥30の攪拌を十分に
行うことができる。
According to this embodiment, the small circulating flow a branched from the branch pipe 13a joins with the large circulating flow A while turning around the draft tube 10, so that the sludge 30 is formed around the draft tube 10. The sludge 30 can be sufficiently stirred throughout the digestion tank 1 without stagnation.

【0018】上記各実施形態においては、ドラフトチュ
ーブ10内の汚泥30の流れが上向きの場合について説
明したが、スクリュー19の回転を反転させて、ドラフ
トチューブ10内の流れを下向きにして運転してもよ
い。この場合は、ドラフトチューブ10の下端開口部か
ら吐出した汚泥30が消化槽1の内壁に沿って上昇し、
ドラフトチューブ10の上端開口部から吸込まれる大き
な循環流Aと、この大きな循環流Aの一部が枝管13
(13a)から入ってドラフトチューブ2内で再び合流
する小さな循環流aとが生じる。この場合にも、小さい
循環流aがドラフトチューブ10の周辺に滞留し易い汚
泥30を攪拌することができる。
In each of the above embodiments, the case where the flow of the sludge 30 in the draft tube 10 is upward has been described. However, the operation is performed by inverting the rotation of the screw 19 and causing the flow in the draft tube 10 to downward. Is also good. In this case, the sludge 30 discharged from the lower end opening of the draft tube 10 rises along the inner wall of the digestion tank 1,
The large circulation flow A sucked from the upper end opening of the draft tube 10 and a part of the large circulation flow A
A small circulating flow a which enters from (13a) and merges again in the draft tube 2 is generated. Also in this case, the sludge 30 in which the small circulating flow a easily stays around the draft tube 10 can be stirred.

【0019】また、上記各実施形態においては、複数の
枝管13,13aをドラフトチューブ10に斜め上向き
に設けた場合を示したが、複数の枝管13,13aを斜
め下向きに設けてもよく、さらに、ドラフトチューブ1
0の上下方向の中間部近傍に複数の枝管13,13aを
設けた場合を示したが、ドラフトチューブ10の上下方
向の複数個所に、それぞれ複数の枝管13,13aを設
けてもよい。また、上記各実施形態においては、図1に
示した攪拌装置に本発明を実施した場合を示したが、図
4に示した水中攪拌機20を有する攪拌装置にも本発明
を実施することができる。
In each of the above embodiments, the case where the plurality of branch pipes 13 and 13a are provided obliquely upward in the draft tube 10 has been described. However, the plurality of branch pipes 13 and 13a may be provided obliquely downward. And a draft tube 1
Although the case where the plurality of branch pipes 13 and 13a are provided near the middle part in the vertical direction of 0 is shown, a plurality of branch pipes 13 and 13a may be provided at a plurality of places in the vertical direction of the draft tube 10, respectively. Further, in each of the above embodiments, the case where the present invention is applied to the stirring device shown in FIG. 1 has been described, but the present invention can also be applied to the stirring device having the underwater stirrer 20 shown in FIG. .

【0020】[0020]

【発明の効果】【The invention's effect】

(1)本発明に係る消化槽の攪拌装置は、消化槽内に立
設されたドラフトチューブと、このドラフトチューブ内
に少なくとも攪拌用のスクリューが挿入された攪拌装置
とを有し、ドラフトチューブの上下方向の少なくとも中
間部近傍に、斜め上方又は斜め下方に向けて複数の枝管
を設けたので、消化槽の内壁に沿って流れる大きな循環
流と、消化槽の中央部を通過する小さな循環流を発生さ
せることができる。このため、ドラフトチューブの周辺
に汚泥が滞留することがなく、消化槽内の汚泥を十分に
攪拌することができる。
(1) A stirrer for a digestion tank according to the present invention includes a draft tube provided upright in a digestion tank, and a stirrer in which at least a screw for stirring is inserted in the draft tube. Since a plurality of branch pipes are provided obliquely upward or downward at least in the vicinity of the middle part in the vertical direction, a large circulating flow flowing along the inner wall of the digester and a small circulating flow passing through the central part of the digester Can be generated. Therefore, the sludge does not stay around the draft tube, and the sludge in the digestion tank can be sufficiently stirred.

【0021】(2)また、上記(1)の枝管を斜め上方
又は斜め下方に向けて螺旋状に形成し、汚泥がドラフト
チューブの周りを旋回しながら流れるようにしたので、
上記(1)と同様の効果を得ることができる。
(2) Further, the branch pipe of the above (1) is formed in a spiral shape obliquely upward or diagonally downward, so that the sludge flows while turning around the draft tube.
The same effect as the above (1) can be obtained.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施形態1の縦断面図である。FIG. 1 is a longitudinal sectional view of Embodiment 1 of the present invention.

【図2】本発明の実施形態2の要部の平断面図である。FIG. 2 is a plan sectional view of a main part according to a second embodiment of the present invention.

【図3】従来の消化槽の攪拌装置の一例の縦断面図であ
る。
FIG. 3 is a longitudinal sectional view of an example of a conventional digester stirring device.

【図4】従来の消化槽の攪拌装置の他の例の要部の縦断
面図である。
FIG. 4 is a longitudinal sectional view of a main part of another example of a conventional digester stirring device.

【符号の説明】[Explanation of symbols]

1 消化槽 10 ドラフトチューブ 13,13a 枝管 15 攪拌機 19 スクリュー DESCRIPTION OF SYMBOLS 1 Digestion tank 10 Draft tube 13, 13a Branch pipe 15 Stirrer 19 Screw

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 消化槽内に立設されたドラフトチューブ
と、該ドラフトチューブ内に少なくとも攪拌用のスクリ
ューが挿入された攪拌機とを有し、 前記ドラフトチューブの上下方向の少なくとも中間部近
傍に、斜め上方又は斜め下方に向けた複数の枝管を設け
たことを特徴とする消化槽の攪拌装置。
1. A draft tube erected in a digestion tank, and a stirrer in which at least a screw for stirring is inserted in the draft tube, at least in the vicinity of an intermediate portion in a vertical direction of the draft tube, A stirrer for a digestion tank, comprising a plurality of branch pipes directed diagonally upward or diagonally downward.
【請求項2】 枝管を斜め上方又は斜め下方に向けて螺
旋状に形成したことを特徴とする請求項1記載の消化槽
の攪拌装置。
2. The stirring device for a digestion tank according to claim 1, wherein the branch pipe is formed in a spiral shape obliquely upward or downward.
JP10442097A 1997-04-22 1997-04-22 Agitator of digestion tank Pending JPH10290999A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10442097A JPH10290999A (en) 1997-04-22 1997-04-22 Agitator of digestion tank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10442097A JPH10290999A (en) 1997-04-22 1997-04-22 Agitator of digestion tank

Publications (1)

Publication Number Publication Date
JPH10290999A true JPH10290999A (en) 1998-11-04

Family

ID=14380211

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10442097A Pending JPH10290999A (en) 1997-04-22 1997-04-22 Agitator of digestion tank

Country Status (1)

Country Link
JP (1) JPH10290999A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8157432B2 (en) * 2007-02-27 2012-04-17 Chicago Bridge & Iron Company Method of mixing a fluid in a tank with a draft tube mixing system
CN108178263A (en) * 2018-01-09 2018-06-19 张仕超 Industrial Waste Water Treatments pond
CN109825423A (en) * 2019-01-09 2019-05-31 德沃(苏州)环境科技有限公司 Internal-circulation type bioreactor
CN112171896A (en) * 2020-09-30 2021-01-05 廖昌成 Automatic discharging device for concrete mixer and using method
JP2021090926A (en) * 2019-12-11 2021-06-17 鹿島建設株式会社 Digestive tank

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8157432B2 (en) * 2007-02-27 2012-04-17 Chicago Bridge & Iron Company Method of mixing a fluid in a tank with a draft tube mixing system
CN108178263A (en) * 2018-01-09 2018-06-19 张仕超 Industrial Waste Water Treatments pond
CN109825423A (en) * 2019-01-09 2019-05-31 德沃(苏州)环境科技有限公司 Internal-circulation type bioreactor
CN109825423B (en) * 2019-01-09 2022-04-29 德沃(苏州)环境科技有限公司 Internal circulation type bioreactor
JP2021090926A (en) * 2019-12-11 2021-06-17 鹿島建設株式会社 Digestive tank
CN112171896A (en) * 2020-09-30 2021-01-05 廖昌成 Automatic discharging device for concrete mixer and using method

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