JP3436876B2 - Control method of aerator for oxidation ditch - Google Patents
Control method of aerator for oxidation ditchInfo
- Publication number
- JP3436876B2 JP3436876B2 JP03234798A JP3234798A JP3436876B2 JP 3436876 B2 JP3436876 B2 JP 3436876B2 JP 03234798 A JP03234798 A JP 03234798A JP 3234798 A JP3234798 A JP 3234798A JP 3436876 B2 JP3436876 B2 JP 3436876B2
- Authority
- JP
- Japan
- Prior art keywords
- aerator
- inverter
- ditch
- rotation speed
- sensor
- 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 - Fee Related
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)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、下水処理施設に関
し、特にオキシデーションディッチにおけるエアレータ
の制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage treatment facility, and more particularly to a method for controlling an aerator in an oxidation ditch.
【０００２】[0002]
【従来の技術】図２は下水をオキシデーションディッチ
法により処理する公知のオキシデーションディッチの概
略平面図である。オキシデーションディッチは無終端水
路１の中央部分に長手方向に沿って隔壁２が設置され、
前記水路１の曲部に隔壁２に近接して縦型エアレータ３
が設置されており、エアレータの回転運動により水路１
内に流入された下水を槽壁と隔壁２で形成される水路を
エアレータの回転方向に沿って還流させながら活性汚泥
との混合撹拌と曝気処理とを行い、浄化された水は水路
１に設けた越流堰４から沈殿槽へと排出される下水処理
設備である。2. Description of the Related Art FIG. 2 is a schematic plan view of a known oxidation ditch for treating sewage by an oxidation ditch method. In the oxidation ditch, a partition wall 2 is installed in the central portion of the endless water channel 1 along the longitudinal direction,
A vertical aerator 3 is provided near the partition wall 2 in the curved portion of the water channel 1.
Is installed, and the waterway 1
The purified water is provided in the water channel 1 by mixing and agitating with the activated sludge while agitating the sewage flowing into the tank through the water channel formed by the tank wall and the partition wall 2 along the rotation direction of the aerator. It is a sewage treatment facility that is discharged from the overflow weir 4 to the settling tank.
【０００３】上記設備で良好な処理水質を得るためには
ディッチ内混合液に溶存酸素を適性に保持・コントロー
ルすることが必要である。そのために、図３に示すよう
に、水路１内に溶存酸素量を検出するＤＯセンサー５を
設置し、該ＤＯセンサーからの検出信号を自動ＤＯコン
トローラ６´へ入力すると該コントローラ６´で前記セ
ンサー５によって検出された溶存酸素量と制御設定値の
偏差を演算し、エアレータの最適回転数指令信号をイン
バータ７に入力することにより、エアレータ駆動モータ
の回転数を制御して溶存酸素量を自動制御している。In order to obtain good treated water quality with the above equipment, it is necessary to appropriately maintain and control the dissolved oxygen in the liquid mixture in the ditch. Therefore, as shown in FIG. 3, when a DO sensor 5 for detecting the amount of dissolved oxygen is installed in the water channel 1 and a detection signal from the DO sensor is input to an automatic DO controller 6 ′, the controller 6 ′ can detect the sensor. By calculating the deviation between the dissolved oxygen amount detected by 5 and the control set value, and inputting the optimum rotation speed command signal of the aerator to the inverter 7, the rotation speed of the aerator drive motor is controlled to automatically control the dissolved oxygen quantity. is doing.
【０００４】しかして、エアレータを回転数制御により
運転している場合、例えば、水路１内の水位が上昇し、
エアレータの浸液深さが深くなり、これに起因してエア
レータにかかるトルクが過負荷状態になったときには、
モータの焼損防止等エアレータを保護するためにエアレ
ータの運転を停止するようにしている。ところが、もし
も運転係員が不在でエアレータが長時間運転停止状態が
続いていると、エアレータが故障でもないのにオキシデ
ーションディッチによる下水処理が中断され下水処理施
設全体の運転に支障をきたすおそれがある。However, when the aerator is operated by controlling the number of revolutions, for example, the water level in the water channel 1 rises,
When the immersion depth of the aerator becomes deep and the torque applied to the aerator is overloaded due to this,
The operation of the aerator is stopped in order to protect the aerator by preventing motor burnout. However, if the operator is absent and the aerator is stopped for a long time, the sewage treatment by the oxidation ditch may be interrupted and the operation of the entire sewage treatment facility may be disturbed even though the aerator is not broken. .
【０００５】[0005]
【発明が解決しようとする課題】本発明は、エアレータ
に何等かの原因で過負荷がかかったとき、エアレータの
運転を停止することなく、自動的にエアレータが過負荷
状態から回避でき、運転継続できる制御方法を目的とす
る。SUMMARY OF THE INVENTION According to the present invention, when an overload is applied to the aerator for some reason, the aerator can be automatically avoided from the overloaded state without stopping the operation of the aerator, and the operation can be continued. The purpose is a control method that can.
【０００６】[0006]
【課題を解決するための手段】ディッチ内混合液の溶存
酸素量を検出するＤＯセンサー５と、該ディッチのエア
レータ３にかかるトルクを検出するための検出器８と、
前記ＤＯセンサー５及び前記検出器８からの信号を演算
処理する制御装置６と、該制御装置６からの指令により
前記エアレータ３の回転速度を変速するインバータ７を
設け、前記ＤＯセンサー５からの信号が入力された前記
制御装置６からエアレーター３の最適回転数指令信号を
前記インバータ７に与えて前記エアレータ３の自動制御
運転すると共に、前記検出器８からの信号が前記エアレ
ータ３にかかるトルクが過負荷状態になったことを検出
したとき、前記制御装置６から前記インバータ７にエア
レータの減速指令を与えてエアレータ３をタイマーによ
り３０分〜１時間減速運転させることにより過負荷状態
から回避させ、該減速運転時間経過後は通常のオキシデ
ーションディッチ運転に切り替えられることを特徴とす
る。A DO sensor 5 for detecting the amount of dissolved oxygen in a liquid mixture in a ditch, and a detector 8 for detecting a torque applied to an aerator 3 of the ditch,
A control device 6 for processing the signals from the DO sensor 5 and the detector 8 and an inverter 7 for changing the rotation speed of the aerator 3 in response to a command from the control device 6 are provided, and the signal from the DO sensor 5 is provided. The optimum rotation speed command signal of the aerator 3 is supplied from the control device 6 to which the inverter 7 is input to perform the automatic control operation of the aerator 3, and the signal from the detector 8 causes the torque applied to the aerator 3 to increase. When it is detected that an overload condition has occurred, the controller 6 gives a deceleration command of the aerator to the inverter 7 to cause the aerator 3 to decelerate for 30 minutes to 1 hour to avoid the overload condition. After the deceleration operation time has elapsed, the normal oxidation ditch operation is switched to.
【０００７】[0007]
【発明の実施の形態】本発明にかかるエアレータ３の制
御方法の実施の形態について図１により説明する。オキ
シデーションディッチを行なう無終端水路１内にはディ
ッチ内混合液の溶存酸素量を検出するＤＯセンサー５が
設置されており、該センサー５からの検出信号は自動Ｄ
Ｏコントロール機能を具備する制御装置６に入力され、
該制御装置６で演算処理されエアレータの最適回転数指
令信号をインバータ７に入力することによりエアレータ
駆動モータの回転数を制御して溶存酸素量を自動制御す
る手段は従来方法と同じである。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a control method for an aerator 3 according to the present invention will be described with reference to FIG. A DO sensor 5 that detects the amount of dissolved oxygen in the mixed liquid in the ditch is installed in the endless water channel 1 that performs the oxidation ditch, and the detection signal from the sensor 5 is automatically D
Input to the control device 6 having an O control function,
The means for automatically controlling the dissolved oxygen amount by controlling the rotation speed of the aerator drive motor by inputting the optimum rotation speed command signal of the aerator to the inverter 7 which is processed by the control device 6 is the same as the conventional method.
【０００８】本発明では、上記エアレータの自動制御運
転中、流入下水が一時的に多量に流入し、水路１内の水
位が上昇しエアレータ３が過負荷状態に陥ったとき、エ
アレータにかかるトルクを検出するトルク検出器８を設
置しており、該トルク検出器８からの検出信号が制御装
置６に入力される。なお、上記トルク検出器の中にはエ
アレータ駆動モータの電流値を検出するものも含まれ
る。In the present invention, during the automatic control operation of the aerator, when a large amount of inflowing sewage temporarily flows in, the water level in the water channel 1 rises and the aerator 3 falls into an overloaded state, the torque applied to the aerator is reduced. A torque detector 8 for detecting is installed, and a detection signal from the torque detector 8 is input to the control device 6. It should be noted that the torque detector includes one that detects the current value of the aerator drive motor.
【０００９】制御装置６に入力されたトルク検出信号が
設定値以上になっていることを検出すると、タイマーを
作動させて所定時間（３０分ないし１時間）エアレータ
の許容最低回転数指令信号をインバータ７に入力するこ
とにより、その間エアレータは低速回転運転に切り替え
られる。なお、上記エアレータの許容最低回転数とは、
汚泥が槽底に沈降しない最低回転数のことである。そし
て、所定時間経過後再び通常のオキシデーションディッ
チ運転に切り替えられる。When it is detected that the torque detection signal input to the control device 6 is equal to or more than the set value, the timer is activated to output the allowable minimum rotation speed command signal of the aerator for a predetermined time (30 minutes to 1 hour). By inputting to 7, the aerator is switched to the low speed rotation operation during that time. The minimum permissible rotation speed of the aerator is
It is the minimum speed at which sludge does not settle to the bottom of the tank. Then, after a lapse of a predetermined time, the normal oxidation ditch operation is switched to again.
【００１０】次に本発明による作用について説明する。
オキシデーションディッチの通常運転時、ＤＯセンサー
５からの検出信号は制御装置６で演算処理されエアレー
タの最適回転数指令信号がインバータ７に入力される。
インバータ７の作動によりエアレータのモータの回転数
を制御してディッチ内混合液の溶存酸素量が最適値とな
るようにエアレータを制御している。上記通常運転時、
何等かの原因で水路１内の水位が上昇しエアレータの浸
液深さが深くなりエアレータにかかるトルクが次第に上
昇するが、該トルクはトルク検出器８で検出されてお
り、トルク検出信号が制御装置６に入力され、該検出信
号が許容最大設定値に達すると、制御装置６からの指令
によりタイマーが作動しエアレータ３は通常運転からタ
イマー運転に切り替えられる。Next, the operation of the present invention will be described.
During normal operation of the oxidation ditch, the detection signal from the DO sensor 5 is arithmetically processed by the control device 6 and the optimum rotation speed command signal of the aerator is input to the inverter 7.
The rotation speed of the motor of the aerator is controlled by the operation of the inverter 7, and the aerator is controlled so that the dissolved oxygen amount of the mixed liquid in the ditch becomes an optimum value. During the above normal operation,
For some reason, the water level in the water channel 1 rises, the immersion depth of the aerator becomes deeper, and the torque applied to the aerator gradually rises, but the torque is detected by the torque detector 8 and the torque detection signal is controlled. When the detection signal is input to the device 6 and reaches the maximum allowable set value, the timer is activated by a command from the control device 6 and the aerator 3 is switched from the normal operation to the timer operation.
【００１１】タイマー運転に切り替えられると、タイマ
ー設定時間（３０分ないし１時間程度）の間、汚泥がデ
ィッチの槽底に沈積しない程度の循環流を保持できるま
でにエアレータの回転速度を減速させるべくインバータ
７に減速回転数指令信号が入力されてエアレータの回転
数が減少し、エアレータは過負荷状態から回避される。
したがって、タイマー運転中は曝気処理の効率は低下し
ているが、流入下水は汚泥を沈積しないように水路１内
を循環している。そして、タイマー設定時間が経過する
と通常運転に切り替えられる。タイマー運転中に水路１
内の水位が下降すれば通常のオキシデーションディッチ
運転が再開される。[0011] is switched to the timer operation, during the timer setting time (30 minutes to about 1 hour), the sludge is de
The deceleration speed command signal is input to the inverter 7 to reduce the rotational speed of the aerator until the circulating flow that does not settle on the bottom of the switch can be maintained, and the rotational speed of the aerator decreases. Avoided.
Therefore, the efficiency of the aeration process is lowered during the timer operation, but the inflowing sewage circulates in the water channel 1 so as not to deposit sludge. Then, when the timer set time has elapsed, the operation is switched to normal operation. Waterway 1 during timer operation
If the water level inside falls, normal oxidation ditch operation is resumed.
【００１２】[0012]
【発明の効果】本発明はオキシデーションディッチの運
転時、何等かの原因でエアレータが過負荷状態に陥った
とき、エアレータの運転を停止させることなく暫時エア
レータの回転速度を汚泥の沈積が生じない程度に減速し
て運転を継続し、エアレータが故障でない場合は、通常
の回転速度に復元されて曝気処理が再開されるのでエア
レータの運転停止による不利益を解消できる。According to the present invention, when the oxidation ditch is in operation, when the aerator falls into an overload state for some reason, the rotation speed of the aerator is temporarily stopped without sludge deposition. When the aerator does not malfunction, the operation is continued after being decelerated to a certain extent, and when the aerator is not in failure, the aeration process is resumed by restoring the normal rotation speed, and thus the disadvantage due to the stop of the aerator operation can be eliminated.
【図１】本発明によるエアレータの制御方法の１実施態
様を示す説明図FIG. 1 is an explanatory view showing an embodiment of a control method for an aerator according to the present invention.
【図２】公知のオキシデーションディッチの概略説明
図。FIG. 2 is a schematic explanatory view of a known oxidation ditch.
【図３】公知のエアレータの制御手段の説明図。FIG. 3 is an explanatory view of control means of a known aerator.
１ 無終端水路 ２ 隔壁 ２´ 整流壁 ３ 縦型エアレータ ４ 越流堰 ５ ＤＯセンサー ６ 制御装置 ７ インバータ ８ トルク検出器 1 endless waterway 2 partitions 2'rectifying wall 3 Vertical aerator 4 Overflow weir 5 DO sensor 6 control device 7 inverter 8 Torque detector
Claims (2)
ＤＯセンサー（５）と、該ディッチのエアレータ（３）
にかかるトルクを検出するための検出器（８）と、前記
ＤＯセンサー（５）及び前記検出器（８）からの信号を
演算処理する制御装置（６）と、該制御装置（６）から
の指令によりエアレータ（３）の回転速度を変速するイ
ンバータ（７）を設け、前記ＤＯセンサー（５）からの
信号が入力された前記制御装置（６）からエアレーター
（３）の最適回転数指令信号を前記インバータ（７）に
与えて前記エアレータ（３）の自動制御運転すると共
に、前記検出器（８）からの信号が前記エアレータ
（３）にかかるトルクが過負荷状態になったことを検出
したとき、制御装置（６）から前記インバータ（７）に
エアレータの減速指令を与えてエアレータ（３）をタイ
マーにより所定時間減速運転させることにより過負荷状
態から回避させ、所定時間経過後はＤＯセンサー（５）
からの検出信号が制御装置（６）で演算処理されエアレ
ーターの最適回転数指令信号がインバータ（７）に入力
され、インバータ（７）の作動によりエアレータ（３）
のモータの回転数を制御してディッチ内混合液の溶存酸
素量が最適値となるようにエアレータ（３）を制御する
運転に切り替えられることを特徴とするオキシデーショ
ンディッチ用エアレータの制御方法。1. A DO sensor (5) for detecting the amount of dissolved oxygen in a liquid mixture in a ditch, and an aerator (3) for the ditch.
A detector (8) for detecting the torque applied to the controller, a controller (6) for arithmetically processing signals from the DO sensor (5) and the detector (8), and a controller (6) from the controller (6). An inverter (7) for changing the rotation speed of the aerator (3) according to a command is provided, and the optimum rotation speed command signal of the aerator (3) is input from the control device (6) to which the signal from the DO sensor (5) is input. together with the automatic control operation of the aerator (3) is given to the inverter (7), the signal from the detector (8) detects that the torque applied to the aerator (3) is overloaded when, Thailand aerator (3) control unit (6) gives a deceleration command of the aerator to the inverter (7)
The vehicle is decelerated for a predetermined time to avoid the overload condition, and after the predetermined time elapses, the DO sensor (5)
The detection signal from the controller is arithmetically processed by the control device (6) and
The optimum rotation speed command signal of the motor is input to the inverter (7).
The aerator (3) is activated by the operation of the inverter (7).
Of the mixed acid in the ditch by controlling the rotation speed of the motor
Control the aerator (3) so that the elementary quantity becomes the optimum value.
A method of controlling an aerator for an oxidation ditch, characterized by being switched to operation .
を特徴とする請求項１記載のオキシデーションディッチ
用エアレータの制御方法。Wherein said predetermined time is oxidation ditch for aerator control method of claim 1, wherein the 30 minutes to 1 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03234798A JP3436876B2 (en) | 1998-01-30 | 1998-01-30 | Control method of aerator for oxidation ditch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03234798A JP3436876B2 (en) | 1998-01-30 | 1998-01-30 | Control method of aerator for oxidation ditch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11216487A JPH11216487A (en) | 1999-08-10 |
| JP3436876B2 true JP3436876B2 (en) | 2003-08-18 |
Family
ID=12356435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03234798A Expired - Fee Related JP3436876B2 (en) | 1998-01-30 | 1998-01-30 | Control method of aerator for oxidation ditch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3436876B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4579450B2 (en) * | 2001-05-18 | 2010-11-10 | 住友重機械エンバイロメント株式会社 | Operation control method of oxidation ditch |
| SE538527C2 (en) * | 2014-06-17 | 2016-09-06 | Xylem Ip Man S À R L | Plant for the treatment of liquid and method for controlling such a plant |
| EP3252018A1 (en) * | 2016-05-30 | 2017-12-06 | Xylem IP Management S.à.r.l. | Method for determining flow velocity of a liquid in a treatment plant |
| JP7166181B2 (en) * | 2019-01-25 | 2022-11-07 | 住友重機械エンバイロメント株式会社 | Aeration and agitation system and method of operating the aeration and agitation system |
-
1998
- 1998-01-30 JP JP03234798A patent/JP3436876B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11216487A (en) | 1999-08-10 |
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