JPH0312386Y2 - - Google Patents
Info
- Publication number
- JPH0312386Y2 JPH0312386Y2 JP1985129042U JP12904285U JPH0312386Y2 JP H0312386 Y2 JPH0312386 Y2 JP H0312386Y2 JP 1985129042 U JP1985129042 U JP 1985129042U JP 12904285 U JP12904285 U JP 12904285U JP H0312386 Y2 JPH0312386 Y2 JP H0312386Y2
- Authority
- JP
- Japan
- Prior art keywords
- treated
- water
- aeration
- aeration tank
- aerator
- 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.)
- Expired
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 70
- 238000005273 aeration Methods 0.000 claims description 45
- 238000005276 aerator Methods 0.000 claims description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 25
- 239000001301 oxygen Substances 0.000 claims description 25
- 229910052760 oxygen Inorganic materials 0.000 claims description 25
- 238000001514 detection method Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 description 10
- 239000010802 sludge Substances 0.000 description 7
- 238000013019 agitation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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)
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案は排水処理の単位操作である曝気に用い
られる曝気装置に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an aeration device used for aeration, which is a unit operation in wastewater treatment.
［従来の技術］
活性汚泥法による排水処理では、被処理水中の
有機汚濁物質を好気生微生物によつて酸化分解
し、被処理水を浄化している。そしてこの微生物
の活動と呼吸のために、被処理水中の溶存酸素濃
度を絶えず一定値（一般的には１mg／リツトル）
以上に、望ましくはその一定値に維持する必要が
あり、例えば曝気槽底部に散気管を備え、この散
気管から酸素あるいは空気を吹き出すことにより
被処理水中の溶存酸素濃度の制御を行なうものが
知られている。[Prior Art] In wastewater treatment using the activated sludge method, organic pollutants in the water to be treated are oxidized and decomposed by aerobic microorganisms to purify the water to be treated. For the activity and respiration of these microorganisms, the dissolved oxygen concentration in the water to be treated is constantly maintained at a constant value (generally 1 mg/liter).
As mentioned above, it is desirable to maintain the dissolved oxygen concentration at a constant value. For example, it is known that the concentration of dissolved oxygen in the water to be treated is controlled by installing an aeration pipe at the bottom of the aeration tank and blowing out oxygen or air from the aeration pipe. It is being
又、特開昭59−160594号公報に開示され、第２
図に示すような曝気装置も知られている。この曝
気装置は、曝気槽内の被処理水２０を曝気機２１
のプロペラで撹拌し、プロペラの旋回による負圧
を利用して酸素、あるいは空気を被処理水の流れ
る方向に向かつて被処理水２０内に供給してい
る。そして曝気槽内に流速計２２と溶存酸素濃度
計２３を設け、その入力値により曝気機２１の駆
動用モータを制御して溶存酸素濃度を所定値に維
持するものである。この曝気装置に用いられてい
る曝気機２１は、第３図に示すように、モータ３
０に直結して中空シヤフト３１が設けられ、これ
らはカバー３２内に収納され、該中空シヤフト３
１の先端には撹拌用プロペラ３３が取り付けられ
ている。中空シヤフト３１にはガスを取り入れる
ための吸引孔３４が中空孔に連通して設けられ、
該中空孔はプロペラ３３の先端に開口し、カバー
３２には空気取り入れ用の開口部３５が形成され
ている。これによりモータ３０によるプロペラ３
３の回転に際しては、水流（矢印）により中空シ
ヤフト３１の先端に負圧を生じ、空気は中空孔を
介して被処理水中に放出される。この曝気機２１
は、被処理水中への酸素溶解効率が約10％と、曝
気槽底部に散気管を有するものの６〜７％に比較
して高いため、近年利用の動きが高まつている。 Also disclosed in Japanese Patent Application Laid-Open No. 59-160594, No. 2
An aeration device as shown in the figure is also known. In this aeration device, the water to be treated 20 in the aeration tank is transferred to an aerator 21.
Oxygen or air is supplied into the water to be treated 20 in the flow direction of the water to be treated using the negative pressure created by the rotation of the propeller. A current meter 22 and a dissolved oxygen concentration meter 23 are provided in the aeration tank, and the input values thereof control the driving motor of the aerator 21 to maintain the dissolved oxygen concentration at a predetermined value. The aerator 21 used in this aeration device has a motor 3 as shown in FIG.
A hollow shaft 31 is provided directly connected to the
A stirring propeller 33 is attached to the tip of 1. The hollow shaft 31 is provided with a suction hole 34 communicating with the hollow hole for taking in gas,
The hollow hole opens at the tip of the propeller 33, and the cover 32 has an opening 35 for air intake. As a result, the propeller 3 by the motor 30
3, a negative pressure is generated at the tip of the hollow shaft 31 by the water flow (arrow), and air is released into the water to be treated through the hollow hole. This aerator 21
Since the oxygen dissolution efficiency in the water to be treated is about 10%, which is higher than the 6 to 7% of the aeration tank with a diffuser pipe at the bottom, its use has been increasing in recent years.
［考案が解決しようとする問題点］
上記した曝気機を使用した曝気装置では、被処
理水の深さが約3.5ｍ以上になると、被処理水深
部まで撹拌の力が伝わらないという不具合があつ
た。このために曝気槽底部に汚泥が堆積し、腐敗
して他の活性汚泥の活動を妨げるなど、正常な処
理が困難となつていた。[Problems to be solved by the invention] The aeration equipment using the aerator described above has a problem in that when the depth of the water to be treated exceeds approximately 3.5 m, the agitation force is not transmitted to the depths of the water to be treated. Ta. As a result, sludge accumulates at the bottom of the aeration tank, rots, and interferes with the activity of other activated sludge, making normal treatment difficult.
本考案はこの問題点に鑑みてなされたものであ
り、被処理水の深さが3.5ｍを超える場合でも、
円滑に撹拌がなされ、安定した処理を行ない得る
曝気装置を提供することを目的とする。 The present invention was developed in view of this problem, and even when the depth of the water to be treated exceeds 3.5 m,
It is an object of the present invention to provide an aeration device that allows smooth stirring and stable processing.
［問題点を解決するための手段］
本考案の曝気装置は、被処理水が流入する入口
部と処理水が流出する出口部とをもつ曝気槽と、
曝気槽内の被処理水浅部に設けられプロペラの旋
回により被処理水に被処理水の流れる方向と逆方
向の力を与えて撹拌するとともに旋回により生ず
る負圧を利用してガスを被処理水の流れる方向と
略逆方向に供給する曝気機と、曝気槽底部に設け
られ被処理水に被処理水の流れる方向と逆方向の
力を与えて被処理水深部を撹拌する撹拌機と、よ
りなることを特徴とする。[Means for Solving the Problems] The aeration device of the present invention includes an aeration tank having an inlet portion into which treated water flows in and an outlet portion through which treated water flows out;
It is installed in the shallow part of the water to be treated in the aeration tank, and uses the rotation of the propeller to apply force to the water to be treated in the opposite direction to the flow direction of the water to be treated, stirring it, and using the negative pressure generated by the swirling to generate the gas to be treated. an aerator that supplies water in a direction substantially opposite to the direction in which the water flows; an agitator that is installed at the bottom of the aeration tank and applies a force to the water to be treated in a direction opposite to the direction in which the water flows to agitate the deep part of the water to be treated; It is characterized by more.
本考案に用いられる曝気機は、例えば第３図に
示すような従来用いられている曝気機をそのまま
用いることができる。この曝気機は一般に被処理
水の浅部の位置に設けられ、プロペラの旋回によ
る負圧により浅部から深部へ、かつ被処理水の流
れる方向と逆方向に向つてガスが供給される。そ
して、プロペラの旋回により被処理水に被処理水
の流れる方向と逆方向の力を与えて撹拌し、負圧
により供給されるガスにより、被処理水内の溶存
酸素濃度を所定値に維持するものである。従つて
このガスには酸素、あるいは空気が用いられる。
なお設置される曝気機の台数は、曝気槽の大き
さ、処理水量などにより種々選択できる。 As the aerator used in the present invention, a conventionally used aerator as shown in FIG. 3, for example, can be used as is. This aerator is generally installed at a shallow part of the water to be treated, and gas is supplied from the shallow part to the deep part, in the opposite direction to the flow direction of the water to be treated, by the negative pressure caused by the rotation of the propeller. Then, by rotating the propeller, a force is applied to the water to be treated in the opposite direction to the flow direction of the water to be treated, stirring it, and the dissolved oxygen concentration in the water to be treated is maintained at a predetermined value by the gas supplied by negative pressure. It is something. Therefore, oxygen or air is used as this gas.
The number of aerators to be installed can be selected depending on the size of the aeration tank, the amount of water to be treated, etc.
撹拌機は曝気槽底部に配設され、曝気機の撹拌
の力が伝わり難い被処理水深部を被処理水に被処
理水の流れる方向と逆方向の力を与えて撹拌しよ
うとするものである。この撹拌機は、プロペラ状
のもの、あるいは被処理水の吸入、放出の動きに
より撹拌するものなど、どのようなものでもよ
い。又、撹拌機の配設台数、配設位置などは、曝
気槽の大きさ、処理水量などにより種々選択でき
る。例えば撹拌機を上下動自在な構成とすること
も好ましい。場合によつては汚泥が被処理水の中
間域に滞留することもあり、このような場合にも
撹拌機の配設深さをその滞留域に合せて、撹拌効
率を高くすることが可能となる。 The agitator is installed at the bottom of the aeration tank, and is designed to agitate the deep part of the water to be treated, where the aeration force of the aerator is difficult to reach, by applying force in the opposite direction to the flow of the water to be treated. . This stirrer may be of any type, such as a propeller type or one that stirs by suction and discharge of the water to be treated. Further, the number of agitators to be installed, their positions, etc. can be variously selected depending on the size of the aeration tank, the amount of water to be treated, etc. For example, it is also preferable that the stirrer be configured to be able to move up and down. In some cases, sludge may accumulate in the intermediate region of the water to be treated, and even in such cases, it is possible to increase the agitation efficiency by adjusting the depth of the agitator to the stagnation region. Become.
上記のように構成された曝気装置において、さ
らに被処理水の流速、溶存酸素濃度などを検出す
る検出装置、およびこれらの検出装置からの入力
値により曝気機のモータの回転数と撹拌機の能力
を制御する制御装置を備えることが望ましい。こ
れにより例えば撹拌機の撹拌能力は一定とし、被
処理水の溶存酸素濃度により曝気機のモータの回
転数を制御することができる。また同時に被処理
水の流速を検知して曝気機のモータの回転数を制
御してもよい。さらに、曝気槽深部の被処理水の
流速により撹拌機の撹拌能力を制御することも好
ましい。曝気槽深部の流速が一般に10cm／秒より
大きければ汚泥の堆積は生じにくい。従つてこの
時は撹拌機の能力は小さくてよい。また深部の流
速が小さくなるにつれて汚泥が堆積しやすくなる
ので、このような場合は撹拌機の能力は大とする
のが望ましい。このように撹拌機の能力を制御す
ることにより、能力一定の場合に比して省エネル
ギー化を図ることができる。 In the aeration device configured as above, there is also a detection device that detects the flow rate of the water to be treated, dissolved oxygen concentration, etc., and the input values from these detection devices are used to determine the rotation speed of the aerator motor and the capacity of the agitator. It is desirable to have a control device for controlling the As a result, for example, the stirring capacity of the stirrer can be kept constant, and the rotation speed of the aerator motor can be controlled depending on the dissolved oxygen concentration of the water to be treated. Moreover, the rotation speed of the motor of the aerator may be controlled by simultaneously detecting the flow rate of the water to be treated. Furthermore, it is also preferable to control the stirring ability of the stirrer by the flow rate of the water to be treated deep in the aeration tank. Generally, if the flow velocity in the deep part of the aeration tank is greater than 10 cm/sec, sludge accumulation is unlikely to occur. Therefore, at this time, the capacity of the stirrer may be small. Furthermore, as the flow velocity in the deep part decreases, sludge tends to accumulate, so in such a case, it is desirable to increase the capacity of the agitator. By controlling the capacity of the stirrer in this way, it is possible to save energy compared to the case where the capacity is constant.
［考案の作用及び効果］
本考案の曝気装置では、被処理水浅部に設けら
れた曝気機と、被処理水深部に設けられた撹拌機
により、深さが3.5ｍ以上であつても被処理水は
被処理水の流れる方向と逆方向の力が与えられて
全体的に撹拌される。従つて撹拌効率が従来に比
して著しく高まり、汚泥の堆積を防ぐとともに処
理の安定化を図ることができる。又、被処理水深
部の流速を検知し、その信号により撹拌機の能力
を制御するようにすれば、不必要な撹拌を行なう
のが防止され、省エネルギーとなるとともに常に
適切な撹拌を行なうことができる。[Operations and Effects of the Invention] The aeration device of the present invention has an aerator installed in the shallow part of the water to be treated and an agitator installed in the deep part of the water to be treated, so that even if the depth is 3.5 m or more, The treated water is agitated as a whole by applying a force in the direction opposite to the flow direction of the water to be treated. Therefore, the stirring efficiency is significantly increased compared to the conventional method, and it is possible to prevent the accumulation of sludge and stabilize the treatment. In addition, by detecting the flow velocity in the deep part of the water to be treated and controlling the capacity of the agitator based on the signal, unnecessary agitation can be prevented, saving energy and ensuring proper agitation at all times. can.
［実施例］ 以下実施例により説明する。[Example] This will be explained below using examples.
第１図に本考案の１実施例の曝気装置を示す。
曝気槽１は入口部１ａと出口部１ｂとをもち、被
処理水２は入口部１ａから出口部１ｂに向かつて
一方向に流れている。 FIG. 1 shows an aeration device according to one embodiment of the present invention.
The aeration tank 1 has an inlet part 1a and an outlet part 1b, and the water to be treated 2 flows in one direction from the inlet part 1a to the outlet part 1b.
曝気槽１の出口部16寄りの被処理水２の水面上
方には、荷台３が設けられ、荷台３には曝気機４
が取り付けられている。そして曝気機４先端のプ
ロペラが入口部１ａに向かつて被処理水２中に没
している。この曝気機４は従来の技術で説明した
第３図の曝気機と同一であり、構成の詳しい説明
は省略する。 A loading platform 3 is provided above the surface of the water to be treated 2 near the outlet 16 of the aeration tank 1, and an aerator 4 is mounted on the loading platform 3.
is installed. The propeller at the tip of the aerator 4 is immersed in the water to be treated 2 toward the inlet portion 1a. This aerator 4 is the same as the aerator shown in FIG. 3 described in the prior art section, and detailed explanation of its construction will be omitted.
曝気槽１底部で、曝気機４よりさらに出口部１
ｂ側にはプロペラの回転により撹拌を行なう撹拌
機５がガイド棒６に保持されて配設されている。
この撹拌機５はガイド棒６に案内されて上下動自
在であり、被処理水の任意の深さに配設可能とな
つている。そしてプロペラの回転により被処理水
２に被処理水２の流れる方向と逆方向の力を与え
て撹拌を行なう構成である。 At the bottom of the aeration tank 1, further from the aerator 4 is the outlet section 1.
On the b side, a stirrer 5 that stirs by rotating a propeller is disposed and held by a guide rod 6.
This stirrer 5 is guided by a guide rod 6 and can move up and down, so that it can be placed at any desired depth of the water to be treated. The configuration is such that the rotation of the propeller applies a force to the water to be treated 2 in the direction opposite to the direction in which the water to be treated 2 flows, thereby stirring the water.
曝気槽１内の被処理水２の入口部１ａ側の深部
には流速計７が設けられ、流速演算器８が流速計
７の信号により、インバータ９を介して撹拌機５
の駆動モータを制御している。 A current meter 7 is provided deep on the inlet portion 1a side of the water to be treated 2 in the aeration tank 1, and a flow rate calculator 8 uses a signal from the current meter 7 to control the agitator 5 via an inverter 9.
The drive motor is controlled.
また被処理水２の出口部１ｂ側の浅部には溶存
酸素濃度計１０が設けられ、溶存酸素濃度演算器
１１が溶存酸素濃度計１０の信号により、インバ
ータ１２を介して曝気機４の駆動モータを制御し
ている。 In addition, a dissolved oxygen concentration meter 10 is provided in a shallow part of the outlet portion 1b of the water to be treated 2, and a dissolved oxygen concentration calculator 11 drives the aerator 4 via an inverter 12 based on a signal from the dissolved oxygen concentration meter 10. It controls the motor.
次に上記曝気装置による汚水の処理概要を説明
する。 Next, an outline of the treatment of wastewater by the above aeration device will be explained.
流速計７にて検出された現実の被処理水２の深
部の流速は、連続的に流速演算器８に入力され
る。そして流速演算器８では、予め設定された被
処理水２深部の流速の目標値（一般には10cm／
秒）と現実の流速とが比較され、現実の流速が目
標値より小さい場合には、撹拌機５の駆動モータ
の回転数を大きくするようにインバータ９を制御
する。また、現実の流速が目標値より大きい場合
には、撹拌機５の駆動モータの回転数を小さくす
るようにインバータ９を制御する。 The actual flow velocity of the deep part of the water to be treated 2 detected by the current velocity meter 7 is continuously input to the flow velocity calculator 8 . Then, the flow velocity calculator 8 calculates a preset target value of the flow velocity in the deep part of the water to be treated 2 (generally 10 cm/
seconds) and the actual flow velocity, and if the actual flow velocity is smaller than the target value, the inverter 9 is controlled to increase the rotation speed of the drive motor of the agitator 5. Further, when the actual flow velocity is higher than the target value, the inverter 9 is controlled to reduce the rotation speed of the drive motor of the stirrer 5.
又、溶存酸素濃度センサ１０は上記制御と併行
して被処理水２中の現実の溶存酸素濃度を連続的
に測定し、その値を溶存酸素濃度演算器１１に送
つている。そして溶存酸素濃度演算器１１では被
処理水２の流入量が増加したり、有機汚濁物質の
濃度が増加した場合など、溶存酸素濃度の値が規
定値（一般的には１mg／リツトル）より下がつた
場合に、曝気機４の駆動モータの回転数を増大さ
せるようにインバータ１２を制御し、溶存酸素濃
度を回復させる。また溶存酸素濃度が規定値より
大きくなつた場合には曝気機４の駆動モータの回
転数は小とされる。 Further, in parallel with the above control, the dissolved oxygen concentration sensor 10 continuously measures the actual dissolved oxygen concentration in the water to be treated 2, and sends the value to the dissolved oxygen concentration calculator 11. Then, the dissolved oxygen concentration calculator 11 determines that the dissolved oxygen concentration value falls below a specified value (generally 1 mg/liter) when the inflow amount of the water to be treated 2 increases or the concentration of organic pollutants increases. When the aeration occurs, the inverter 12 is controlled to increase the rotational speed of the drive motor of the aerator 4, thereby restoring the dissolved oxygen concentration. Further, when the dissolved oxygen concentration becomes higher than the specified value, the rotation speed of the drive motor of the aerator 4 is reduced.
以上の制御により本実施例の曝気装置は常に良
好な状態に運転され、被処理水２の水質などの変
動にかかわらず、処理水質の安定と省エネルギー
を図ることができる。 By the above control, the aeration device of this embodiment is always operated in a good condition, and regardless of fluctuations in the quality of the water to be treated 2, etc., it is possible to stabilize the quality of the treated water and save energy.
第１図は本考案の１実施例の曝気装置の配置図
である。第２図及び第３図は従来の曝気装置に係
わるものであり、第２図はその配置図、第３図は
用いられた曝気機の縦断面図である。
１……曝気槽、２，２０……被処理水、４，２
１……曝気機、５……撹拌機、７……流速計、８
……流速演算器、１０……溶存酸素濃度計、１１
……溶存酸素濃度演算器、３１……中空シヤフ
ト、３３……プロペラ。
FIG. 1 is a layout diagram of an aeration device according to an embodiment of the present invention. 2 and 3 relate to a conventional aeration device, FIG. 2 is a layout diagram thereof, and FIG. 3 is a longitudinal sectional view of the aerator used. 1...Aeration tank, 2,20...Water to be treated, 4,2
1... Aerator, 5... Stirrer, 7... Current meter, 8
...Flow rate calculator, 10...Dissolved oxygen concentration meter, 11
...Dissolved oxygen concentration calculator, 31...Hollow shaft, 33...Propeller.
Claims (1)
る出口部とをもつ曝気槽と、 該曝気槽内の該被処理水浅部に設けられプロ
ペラの旋回により該被処理水に該被処理水の流
れる方向と逆方向の力を与えて撹拌するととも
に該旋回により生ずる負圧を利用してガスを該
被処理水の流れる方向と略逆方向に供給する曝
気槽と、 該曝気槽底部に設けられ該被処理水に該被処
理水の流れる方向と逆方向の力を与えて該被処
理水深部を撹拌する撹拌機と、よりなることを
特徴とする曝気装置。 (2) 曝気槽は前記入口部側に設けられ前記被処理
水の流速を検出する第１検出装置および前記出
口部側に設けられ前記処理水の溶存酸素濃度を
検出する第２検出装置を具備し、該第１検出装
置および該第２検出装置からの信号により前記
曝気機および前記撹拌機の能力を制御する制御
装置をもつ実用新案登録請求の範囲第１項記載
の曝気装置。 (3) 撹拌機は前記曝気槽内に上下動自在に保持さ
れている実用新案登録請求の範囲第１項記載の
曝気装置。[Scope of Claim for Utility Model Registration] (1) An aeration tank having an inlet where treated water flows in and an outlet where treated water flows out, and a propeller installed in a shallow part of the treated water in the aeration tank. By swirling, a force is applied to the water to be treated in a direction opposite to the flowing direction of the water to be treated, and the gas is supplied in a direction substantially opposite to the flowing direction of the water to be treated, using the negative pressure generated by the swirling. and an agitator provided at the bottom of the aeration tank that applies force to the water to be treated in a direction opposite to the flow direction of the water to be treated to agitate the deep part of the water to be treated. Aeration equipment. (2) The aeration tank includes a first detection device installed on the inlet side to detect the flow rate of the water to be treated, and a second detection device installed on the outlet side to detect the dissolved oxygen concentration of the treated water. The aeration device according to claim 1, further comprising a control device for controlling the capabilities of the aerator and the agitator based on signals from the first detection device and the second detection device. (3) The aeration device according to claim 1, wherein the agitator is held in the aeration tank so as to be able to move up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985129042U JPH0312386Y2 (en) | 1985-08-23 | 1985-08-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985129042U JPH0312386Y2 (en) | 1985-08-23 | 1985-08-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6239899U JPS6239899U (en) | 1987-03-10 |
| JPH0312386Y2 true JPH0312386Y2 (en) | 1991-03-25 |
Family
ID=31025261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985129042U Expired JPH0312386Y2 (en) | 1985-08-23 | 1985-08-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0312386Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5827000B2 (en) * | 1981-03-05 | 1983-06-06 | 清而 遠藤 | Simple water purification device for small rivers such as irrigation canals |
| JPS59160594A (en) * | 1983-03-03 | 1984-09-11 | Hitachi Kiden Kogyo Ltd | Aerator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5827000U (en) * | 1981-08-18 | 1983-02-21 | 荏原インフイルコ株式会社 | Aerobic biological treatment equipment |
-
1985
- 1985-08-23 JP JP1985129042U patent/JPH0312386Y2/ja not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5827000B2 (en) * | 1981-03-05 | 1983-06-06 | 清而 遠藤 | Simple water purification device for small rivers such as irrigation canals |
| JPS59160594A (en) * | 1983-03-03 | 1984-09-11 | Hitachi Kiden Kogyo Ltd | Aerator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6239899U (en) | 1987-03-10 |
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