JP3865172B2 - Operation control method for aeration apparatus - Google Patents
Operation control method for aeration apparatus Download PDFInfo
- Publication number
- JP3865172B2 JP3865172B2 JP04447898A JP4447898A JP3865172B2 JP 3865172 B2 JP3865172 B2 JP 3865172B2 JP 04447898 A JP04447898 A JP 04447898A JP 4447898 A JP4447898 A JP 4447898A JP 3865172 B2 JP3865172 B2 JP 3865172B2
- Authority
- JP
- Japan
- Prior art keywords
- aeration
- value
- control method
- operation control
- reliability
- 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
Images
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
- Activated Sludge Processes (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、曝気装置の運転制御方法に関し、特に、有機性汚水を活性汚泥で処理し、溶存酸素（ＤＯ）値、酸化還元電位（ＯＲＰ）値又は水素指数（ＰＨ）値を入力因子として、曝気装置を間欠的に、かつ、自動的に運転する曝気装置の運転制御方法に関するものである。
【０００２】
【従来の技術】
有機性汚水を活性汚泥で処理する活性汚泥法においては、溶存酸素（ＤＯ）値、酸化還元電位（ＯＲＰ）値又は水素指数（ＰＨ）値を入力因子として、曝気装置を間欠的に、かつ、自動的に運転することにより、汚水の流入負荷量に対応した曝気を行うようにしている。
【０００３】
【発明が解決しようとする課題】
ところで、この曝気装置の運転制御方法においては、汚水の流入負荷量が急激に増加したり、返送汚泥ポンプが故障して最終沈殿池から活性汚泥が曝気槽に返送されなくなったりすることによって、曝気槽内の活性汚泥（ＭＬＳＳ）濃度が著しく低下すると、曝気装置を間欠的に、かつ、自動的に運転するための入力因子である、溶存酸素（ＤＯ）値、酸化還元電位（ＯＲＰ）値又は水素指数（ＰＨ）値の信頼度が低下し、適切な曝気装置の運転制御を行うことができなくなるという問題点があった。
【０００４】
本発明は、上記従来の曝気装置の運転制御方法の有する問題点に鑑み、降雨等により汚水の流入負荷量が急激に増加し、活性汚泥が系外へ大量に流出したり、返送汚泥ポンプが故障して最終沈殿池から活性汚泥が曝気槽に返送されなくなったりすることによって、曝気槽内の活性汚泥（ＭＬＳＳ）濃度が著しく低下しても、曝気装置の運転制御を適切に行うことができるようにした曝気装置の運転制御方法を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記目的を達成するため、本発明の曝気装置の運転制御方法は、有機性汚水を活性汚泥で処理し、溶存酸素（ＤＯ）値、酸化還元電位（ＯＲＰ）値又は水素指数（ＰＨ）値を入力因子として、曝気装置を間欠的に、かつ、自動的に運転する曝気装置の運転制御方法において、曝気槽内の活性汚泥（ＭＬＳＳ）濃度が低下することによる、前記入力因子の値の信頼度を判断し、入力因子の値の信頼度が低下した場合に、曝気装置を自動制御運転から、予め定めたタイマー運転に切り替えるようにしたことを特徴する。
【０００６】
この場合において、入力因子の値の信頼度の判断を、１日の曝気時間の合計に基づいて行い、１日の曝気時間の合計が基準値以下になった場合に、タイマー運転に切り替えるようにしたり、１日の曝気、非曝気の切替回数に基づいて行い、１日の曝気、非曝気の切替回数が基準値以上になった場合に、タイマー運転に切り替えるようにしたり、活性汚泥（ＭＬＳＳ）濃度に基づいて行い、活性汚泥（ＭＬＳＳ）濃度が基準値以下になった場合に、タイマー運転に切り替えるようにすることができる。
【０００７】
また、入力因子の値の信頼度の判断を、１日の曝気時間の合計又は１日の曝気、非曝気の切替回数に基づいて行うのに代えて、高負荷時間帯の曝気時間の合計又は高負荷時間帯の曝気、非曝気の切替回数に基づいて行い、１日の曝気時間の合計が基準値以下になった場合又は１日の曝気、非曝気の切替回数が基準値以上になった場合に、タイマー運転に切り替えるようにすることができる。
【０００８】
さらに、入力因子の値の信頼度の判断を、高負荷時間帯の連続する曝気時間に基づいて行い、連続する曝気時間が基準値以下である場合に、タイマー運転に切り替えるようにすることができる。
【０００９】
この曝気装置の運転制御方法は、汚水の流入負荷量が急激に増加したり、返送汚泥ポンプが故障して最終沈殿池から活性汚泥が曝気槽に返送されなくなったりすることによって、曝気槽内の活性汚泥（ＭＬＳＳ）濃度が著しく低下して、曝気装置を間欠的に、かつ、自動的に運転するための入力因子である、溶存酸素（ＤＯ）値、酸化還元電位（ＯＲＰ）値又は水素指数（ＰＨ）値の信頼度が低下した場合に、曝気装置を自動制御運転から、予め定めたタイマー運転に切り替えるようにすることにより、曝気装置の運転制御を適切に行うことができる。
【００１０】
特に、入力因子の値の信頼度の判断を、１日の曝気時間の合計又は１日の曝気、非曝気の切替回数に基づいて行うようにした場合には、汚水の流入負荷量の変動に柔軟に対応して、曝気装置の運転制御を行うことができる。
【００１１】
また、入力因子の値の信頼度の判断を、１日の曝気時間の合計又は１日の曝気、非曝気の切替回数に基づいて行うのに代えて、高負荷時間帯の曝気時間の合計又は高負荷時間帯の曝気、非曝気の切替回数に基づいて行うようにしたり、高負荷時間帯の連続する曝気時間に基づいて行うようにした場合には、汚水の曝気不足を確実に防止することができる。
【００１２】
【発明の実施の形態】
以下、本発明の曝気装置の運転制御方法の実施の形態を図面に基づいて説明する。
【００１３】
図１は、本発明の曝気装置の運転制御方法の第１実施例を示し、曝気装置を１日、自動運転した場合のチャートである。
【００１４】
一般に、有機性汚水を活性汚泥で処理する場合、処理槽内の汚水の溶存酸素（ＤＯ）値、酸化還元電位（ＯＲＰ）値又は水素指数（ＰＨ）値のいずれか１つ又は２つ以上を計測し、これを入力因子として、曝気装置を間欠的に、かつ、自動的に運転することにより、汚水の流入負荷量に対応した曝気を行うようにしている。
【００１５】
ところで、この場合において、曝気装置が、適正に運転されているケースでは、図１の上図に示すように、例えば、１日の曝気運転（適正な運転）は、曝気時間の合計が１４時間（非曝気時間の合計が１０時間）、曝気、非曝気の切替回数が１０回となっている。
【００１６】
処理場に流入する汚水は、変動があり、このため、曝気時間等も、汚水の流入負荷量に応じて変動する。
汚水の流入負荷量の変動の幅を３０％と仮定すると、１日の曝気時間の合計は、１０時間が基準値となる。
【００１７】
ところで、汚水の流入負荷量の変動があるにも関わらず、入力因子、すなわち、汚水の溶存酸素（ＤＯ）値、酸化還元電位（ＯＲＰ）値又は水素指数（ＰＨ）値のみにて曝気装置を運転すると、図１の下図に示すように、例えば、１日の曝気運転（不適正な運転）は、曝気時間の合計が８時間（非曝気時間の合計が１６時間）、曝気、非曝気の切替回数が１６回となる。
【００１８】
このように、１日の曝気時間の合計が、基準値の１０時間以下の場合には、入力因子の値の信頼度が低下していると判断し、曝気装置を、入力因子の値に基づく自動制御運転から、予め定めたタイマー運転に切り替え、汚水処理を継続して行うようにする。
この場合、基準値は、処理場、季節等に応じて任意に設定することができ、また、予め定めたタイマー運転の時間が終了すれば、入力因子の値に基づく自動制御運転に切り替え、汚水処理を継続して行うようにすることができる（以下に述べる実施例の場合も同様）。
【００１９】
この場合、入力因子の値の信頼度の判断を、本実施例のように、１日の曝気時間の合計に基づいて行い、１日の曝気時間の合計が基準値（例えば、１０時間）以下になった場合に、タイマー運転に切り替えるようにするほか、１日の非曝気時間の合計に基づいて行い、１日の非曝気時間の合計が基準値（例えば、１４時間）以上になった場合に、タイマー運転に切り替えるようにしたり、１回当たりの非曝気時間を一定量に固定することによって、１日の曝気、非曝気の切替回数に基づいて行い、１日の曝気、非曝気の切替回数が基準値（例えば、１４回。ただし、非曝気時間を１時間／回に固定）以上になった場合に、タイマー運転に切り替えるようにすることができる。
【００２０】
また、入力因子の値の信頼度の判断を、１日の曝気時間若しくは非曝気時間の合計又は１日の曝気、非曝気の切替回数に基づいて行うのに代えて、人間の生活パターンから考えて処理場に流入する汚水の流入負荷量が多く、汚水処理に多くの酸素が必要となる高負荷時間帯（例えば、８時〜１２時）の曝気時間若しくは非曝気時間の合計又は曝気、非曝気の切替回数に基づいて行うようにすることもでき、この場合には、汚水の曝気不足をより確実に防止することができる。
この場合、入力因子の値の信頼度の判断を、例えば、高負荷時間帯の曝気時間の合計に基づいて行うときには、基準値を、例えば、２時間に設定し、２時間以下になった場合に、タイマー運転に切り替えるようにする。
【００２１】
図２は、本発明の曝気装置の運転制御方法の第２実施例を示し、活性汚泥（ＭＬＳＳ）濃度に基づいて曝気装置の運転制御を行う場合の実施環境の状況を判断する方法を示す。
一般、活性汚泥法は、汚水の流入負荷量に対して、適正な活性汚泥量が決められており、ＢＯＤ−ＭＬＳＳ負荷で表現されている。
ＢＯＤ−ＭＬＳＳ負荷は、標準活性汚泥法の場合では、０．２〜０．４ｋｇ／ｋｇであり、また、オキシデーションディッチ法の場合では、０．０３〜０．０７ｋｇ／ｋｇである。
ある汚水の流入負荷量のときに、活性汚泥（ＭＬＳＳ）濃度の適正範囲が、図２に示す範囲であった場合、ＭＬＳＳの基準値は、適正範囲の下限値より低く設定し、それ以下では、曝気装置を間欠的に、かつ、自動的に運転するための入力因子である、溶存酸素（ＤＯ）値、酸化還元電位（ＯＲＰ）値又は水素指数（ＰＨ）値の信頼度が低下していると判断し、曝気装置を、入力因子の値に基づく自動制御運転から、予め定めたタイマー運転に切り替え、汚水処理を継続して行うようにする。
【００２２】
図３は、本発明の曝気装置の運転制御方法の第３実施例を示し、高負荷時間帯の連続する曝気時間に基づいて曝気装置の運転制御を行う場合の実施環境の状況を判断する方法を示す。
人間の生活パターンから考えて処理場に流入する汚水の流入負荷量が多く、汚水処理に多くの酸素が必要となる高負荷時間帯を、例えば、８時〜１２時と設定して、ＤＯカーブ（１）では、ＤＯの基準値に達するまでの時間（Ｔ１）、すなわち、連続する曝気時間が４時間であり、汚水の流入負荷量の対応して曝気が連続的に適正になされていると判断する。
一方、ＤＯカーブ（２）では、ＤＯの基準値に達するまでの時間（Ｔ２）、すなわち、連続する曝気時間が２時間であり、汚水の流入負荷量から想定すると、ＤＯの基準値に達するまでの時間、すなわち、連続する曝気時間が短すぎ、曝気装置を間欠的に、かつ、自動的に運転するための入力因子の値（本実施例においては、溶存酸素（ＤＯ）値。酸化還元電位（ＯＲＰ）値又は水素指数（ＰＨ）値の場合も同様。）の信頼度が低下していると判断し、曝気装置を、入力因子の値に基づく自動制御運転から、予め定めたタイマー運転に切り替え、汚水処理を継続して行うようにする。
【００２３】
【発明の効果】
本発明の曝気装置の運転制御方法によれば、曝気装置の運転制御方法は、汚水の流入負荷量が急激に増加したり、返送汚泥ポンプが故障して最終沈殿池から活性汚泥が曝気槽に返送されなくなったりすることによって、曝気槽内の活性汚泥（ＭＬＳＳ）濃度が著しく低下して、曝気装置を間欠的に、かつ、自動的に運転するための入力因子である、溶存酸素（ＤＯ）値、酸化還元電位（ＯＲＰ）値又は水素指数（ＰＨ）値の信頼度が低下した場合に、曝気装置を自動制御運転から、予め定めたタイマー運転に切り替えるようにすることにより、曝気装置の運転制御を適切に行うことができ、これにより、降雨等により汚水の流入負荷量が急激に増加し、活性汚泥が系外へ大量に流出したり、返送汚泥ポンプが故障して最終沈殿池から活性汚泥が曝気槽に返送されなくなったりすることによって、曝気槽内の活性汚泥（ＭＬＳＳ）濃度が著しく低下しても、汚水処理を、継続して自動的に、かつ、安定して行うことができる。
【００２４】
特に、入力因子の値の信頼度の判断を、１日の曝気時間の合計又は１日の曝気、非曝気の切替回数に基づいて行うようにした場合には、汚水の流入負荷量の変動に柔軟に対応して、曝気装置の運転制御を行うことができる。
【００２５】
また、入力因子の値の信頼度の判断を、１日の曝気時間の合計又は１日の曝気、非曝気の切替回数に基づいて行うのに代えて、高負荷時間帯の曝気時間の合計又は高負荷時間帯の曝気、非曝気の切替回数に基づいて行うようにしたり、高負荷時間帯の連続する曝気時間に基づいて行うようにした場合には、汚水の曝気不足を確実に防止することができる。
【図面の簡単な説明】
【図１】本発明の曝気装置の運転制御方法の第１実施例を示す曝気装置の１日の自動運転チャートである。
【図２】本発明の曝気装置の運転制御方法の第２実施例で、活性汚泥（ＭＬＳＳ）濃度に基づいて曝気装置の運転制御を行う場合の実施環境の状況を判断する方法を示す説明図である。
【図３】本発明の曝気装置の運転制御方法の第３実施例で、高負荷時間帯の連続する曝気時間に基づいて曝気装置の運転制御を行う場合の実施環境の状況を判断する方法を示す説明図である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an operation control method for an aeration apparatus, in particular, treating organic sewage with activated sludge, and using dissolved oxygen (DO) value, oxidation-reduction potential (ORP) value, or hydrogen index (PH) value as an input factor, The present invention relates to an operation control method for an aeration apparatus that operates the aeration apparatus intermittently and automatically.
[0002]
[Prior art]
In the activated sludge method of treating organic sewage with activated sludge, dissolved oxygen (DO) value, redox potential (ORP) value or hydrogen index (PH) value as input factors, the aeration apparatus intermittently, and By operating automatically, aeration corresponding to the inflow load of sewage is performed.
[0003]
[Problems to be solved by the invention]
By the way, in the operation control method of this aeration apparatus, the inflow load of sewage increases abruptly, or the return sludge pump fails and activated sludge is not returned from the final sedimentation tank to the aeration tank. When the activated sludge (MLSS) concentration in the tank is significantly reduced, the dissolved oxygen (DO) value, the oxidation-reduction potential (ORP) value or the input factor for intermittently and automatically operating the aeration apparatus or There was a problem that the reliability of the hydrogen index (PH) value was lowered, and proper operation control of the aeration apparatus could not be performed.
[0004]
In view of the problems of the above conventional aeration apparatus operation control method, the present invention has a rapid increase in the inflow load of sewage due to rainfall or the like, and a large amount of activated sludge flows out of the system or a return sludge pump is used. Even if the activated sludge is not returned from the final sedimentation basin to the aeration tank due to a failure, the operation control of the aeration apparatus can be appropriately performed even if the activated sludge (MLSS) concentration in the aeration tank is significantly reduced. An object of the present invention is to provide an operation control method for an aeration apparatus.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the operation control method for an aeration apparatus according to the present invention treats organic sewage with activated sludge, and calculates dissolved oxygen (DO) value, oxidation-reduction potential (ORP) value, or hydrogen index (PH) value. As the input factor, in the operation control method of the aeration apparatus that operates the aeration apparatus intermittently and automatically, the reliability of the value of the input factor due to the decrease in the activated sludge (MLSS) concentration in the aeration tank. When the reliability of the value of the input factor decreases, the aeration apparatus is switched from automatic control operation to a predetermined timer operation.
[0006]
In this case, the reliability of the input factor value is determined based on the total daily aeration time, and when the total daily aeration time falls below the reference value, switching to timer operation is performed. Or based on the number of times of switching between aeration and non-aeration per day, when the number of times of switching between aeration and non-aeration per day exceeds the reference value, switching to timer operation or activated sludge (MLSS) Based on the concentration, when the activated sludge (MLSS) concentration becomes lower than the reference value, it can be switched to the timer operation.
[0007]
In addition, instead of determining the reliability of the input factor value based on the total daily aeration time or the number of daily aeration / non-aeration switching, the total aeration time in the high load period or Performed based on the number of times of switching between aeration and non-aeration during high-load hours. When the total daily aeration time falls below the reference value, or the number of daily aeration / non-aeration switches exceeds the reference value. In some cases, it can be switched to timer operation.
[0008]
Further, the reliability of the value of the input factor is determined based on the continuous aeration time in the high load time period, and when the continuous aeration time is equal to or less than the reference value, the operation can be switched to the timer operation. .
[0009]
The operation control method for this aeration apparatus is based on the fact that the inflow load of sewage increases rapidly, or the return sludge pump fails and activated sludge is not returned from the final sedimentation basin to the aeration tank. Activated sludge (MLSS) concentration is significantly reduced and dissolved oxygen (DO) value, redox potential (ORP) value or hydrogen index is an input factor for intermittently and automatically operating the aeration apparatus When the reliability of the (PH) value is lowered, the operation control of the aeration apparatus can be appropriately performed by switching the aeration apparatus from the automatic control operation to the predetermined timer operation.
[0010]
In particular, when the judgment of the reliability of the input factor value is made based on the total daily aeration time or the number of daily aeration / non-aeration switching, fluctuations in the inflow load amount of sewage will occur. It is possible to control the operation of the aeration apparatus in a flexible manner.
[0011]
In addition, instead of determining the reliability of the input factor value based on the total daily aeration time or the number of daily aeration / non-aeration switching, the total aeration time in the high load period or When it is performed based on the number of times of switching between aeration and non-aeration in a high load time period, or based on a continuous aeration time in a high load time period, the aeration shortage of sewage should be reliably prevented. Can do.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an operation control method for an aeration apparatus according to the present invention will be described below with reference to the drawings.
[0013]
FIG. 1 shows a first embodiment of an operation control method for an aeration apparatus according to the present invention, and is a chart when the aeration apparatus is automatically operated for one day.
[0014]
Generally, when treating organic sewage with activated sludge, any one or more of dissolved oxygen (DO) value, oxidation-reduction potential (ORP) value or hydrogen index (PH) value of sewage in the treatment tank By measuring and using this as an input factor, the aeration apparatus is intermittently and automatically operated to perform aeration corresponding to the inflow load amount of sewage.
[0015]
By the way, in this case, in the case where the aeration apparatus is properly operated, as shown in the upper diagram of FIG. 1, for example, the daily aeration operation (appropriate operation) has a total aeration time of 14 hours. The total number of times of switching between aeration and non-aeration is 10 (the total non-aeration time is 10 hours).
[0016]
The sewage flowing into the treatment plant varies, and therefore the aeration time and the like also vary according to the sewage inflow load.
Assuming that the fluctuation range of the inflow load amount of sewage is 30%, the total daily aeration time is 10 hours.
[0017]
By the way, in spite of fluctuations in the inflow load of sewage, the aeration apparatus is controlled only by input factors, that is, dissolved oxygen (DO) value, redox potential (ORP) value or hydrogen index (PH) value of sewage. When operating, as shown in the lower diagram of FIG. 1, for example, in a daily aeration operation (inappropriate operation), the total aeration time is 8 hours (the total non-aeration time is 16 hours). The number of times of switching is 16.
[0018]
As described above, when the total daily aeration time is 10 hours or less of the reference value, it is determined that the reliability of the value of the input factor is lowered, and the aeration apparatus is based on the value of the input factor. The automatic control operation is switched to a predetermined timer operation, and the sewage treatment is continuously performed.
In this case, the reference value can be arbitrarily set according to the treatment plant, the season, etc., and when the predetermined timer operation time is over, the control is switched to the automatic control operation based on the value of the input factor. The processing can be continued (the same applies to the embodiments described below).
[0019]
In this case, the reliability of the value of the input factor is determined based on the total daily aeration time as in this embodiment, and the total daily aeration time is equal to or less than a reference value (for example, 10 hours). When it becomes, in addition to switching to timer operation, based on the total of the non-aeration time of the day, when the total of the non-aeration time of the day exceeds the reference value (for example, 14 hours) In addition, by switching to timer operation or fixing the non-aeration time per time to a fixed amount, switching between aeration and non-aeration is performed based on the number of times of switching between aeration and non-aeration. When the number of times becomes a reference value (for example, 14 times, where the non-aeration time is fixed to 1 hour / time) or more, it is possible to switch to timer operation.
[0020]
In addition, instead of determining the reliability of the value of the input factor based on the total aeration time or non-aeration time of the day or the number of times of switching between aeration and non-aeration, it is considered from the human life pattern. The total amount of aeration time or non-aeration time in a high load time period (for example, 8:00 to 12:00) where a large amount of oxygen flows into the treatment plant and a large amount of oxygen is required for sewage treatment or aeration, non-aeration It can also be performed based on the number of times of switching between aerations. In this case, insufficient aeration of sewage can be prevented more reliably.
In this case, for example, when determining the reliability of the value of the input factor based on the total aeration time in the high load time period, for example, when the reference value is set to 2 hours and becomes 2 hours or less Also, switch to timer operation.
[0021]
FIG. 2 shows a second embodiment of the operation control method for the aeration apparatus according to the present invention, and shows a method for determining the state of the implementation environment when the operation control of the aeration apparatus is performed based on the activated sludge (MLSS) concentration.
In general, in the activated sludge method, an appropriate activated sludge amount is determined with respect to the inflow load amount of sewage, and is expressed as a BOD-MLSS load.
The BOD-MLSS load is 0.2 to 0.4 kg / kg in the case of the standard activated sludge method, and 0.03 to 0.07 kg / kg in the case of the oxidation ditch method.
When the appropriate range of activated sludge (MLSS) concentration is the range shown in FIG. 2 at a certain sewage inflow load, the reference value of MLSS is set lower than the lower limit value of the appropriate range. The reliability of dissolved oxygen (DO) value, redox potential (ORP) value, or hydrogen index (PH) value, which is an input factor for intermittently and automatically operating the aeration apparatus, is reduced. The aeration apparatus is switched from the automatic control operation based on the value of the input factor to a predetermined timer operation, and the sewage treatment is continuously performed.
[0022]
FIG. 3 shows a third embodiment of the operation control method for the aeration apparatus according to the present invention, and a method for determining the status of the implementation environment when the operation control of the aeration apparatus is performed based on the continuous aeration time in the high load time zone. Indicates.
Considering the human life pattern, the DO load is set to a high load time, for example, from 8:00 to 12:00, when the load of sewage flowing into the treatment plant is large and a large amount of oxygen is required for sewage treatment. In (1), the time (T1) until the DO reference value is reached, that is, the continuous aeration time is 4 hours, and the aeration is continuously made appropriate in accordance with the inflow load amount of sewage. to decide.
On the other hand, in the DO curve (2), the time to reach the DO reference value (T2), that is, the continuous aeration time is 2 hours, and assuming the DO inflow load amount until the DO reference value is reached. , That is, the continuous aeration time is too short, and the value of the input factor for operating the aeration apparatus intermittently and automatically (in the present embodiment, the dissolved oxygen (DO) value. Redox potential). It is determined that the reliability of the (ORP) value or the hydrogen index (PH) value is reduced), and the aeration apparatus is changed from the automatic control operation based on the value of the input factor to the predetermined timer operation. Switch and continue sewage treatment.
[0023]
【The invention's effect】
According to the operation control method of the aeration apparatus of the present invention, the operation control method of the aeration apparatus is such that the influent load of sewage increases suddenly, or the return sludge pump breaks down and activated sludge enters the aeration tank from the final sedimentation basin. Dissolved oxygen (DO), which is an input factor for intermittently and automatically operating the aeration apparatus, due to the fact that the activated sludge (MLSS) concentration in the aeration tank is remarkably lowered by being not returned. Operation of the aeration apparatus by switching the aeration apparatus from automatic control operation to a predetermined timer operation when the reliability of the value, redox potential (ORP) value or hydrogen index (PH) value decreases. It is possible to control appropriately, and as a result, the inflow load of sewage suddenly increases due to rainfall, etc., and activated sludge flows out of the system in large quantities, or the return sludge pump breaks down and activates from the final sedimentation basin Sludge By or no longer returned to the aeration tank, even when activated sludge (MLSS) concentration in the aeration tank was significantly reduced, the wastewater treatment, automatically continuously, and can be stably performed.
[0024]
In particular, when the judgment of the reliability of the input factor value is made based on the total daily aeration time or the number of daily aeration / non-aeration switching, fluctuations in the inflow load amount of sewage will occur. It is possible to control the operation of the aeration apparatus in a flexible manner.
[0025]
In addition, instead of determining the reliability of the input factor value based on the total daily aeration time or the number of daily aeration / non-aeration switching, the total aeration time in the high load period or When it is performed based on the number of times of switching between aeration and non-aeration in a high load time period, or based on a continuous aeration time in a high load time period, the aeration shortage of sewage must be reliably prevented. Can do.
[Brief description of the drawings]
FIG. 1 is a one-day automatic operation chart of an aeration apparatus showing a first embodiment of an operation control method for an aeration apparatus according to the present invention.
FIG. 2 is an explanatory diagram showing a method for determining the state of the working environment when performing operation control of the aeration apparatus based on the activated sludge (MLSS) concentration in the second embodiment of the operation control method of the aeration apparatus of the present invention. It is.
FIG. 3 shows a third embodiment of the operation control method for an aeration apparatus according to the present invention, a method for determining the status of the implementation environment when performing operation control of the aeration apparatus based on a continuous aeration time in a high load time period. It is explanatory drawing shown.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04447898A JP3865172B2 (en) | 1998-02-10 | 1998-02-10 | Operation control method for aeration apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04447898A JP3865172B2 (en) | 1998-02-10 | 1998-02-10 | Operation control method for aeration apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11226592A JPH11226592A (en) | 1999-08-24 |
| JP3865172B2 true JP3865172B2 (en) | 2007-01-10 |
Family
ID=12692654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04447898A Expired - Fee Related JP3865172B2 (en) | 1998-02-10 | 1998-02-10 | Operation control method for aeration apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3865172B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6306298B2 (en) * | 2013-03-28 | 2018-04-04 | クボタ環境サ−ビス株式会社 | Sewage treatment plant operation method, operation control device, and sewage treatment plant |
| CN103880171A (en) * | 2014-03-23 | 2014-06-25 | 北京工业大学 | Method for inducing recovery of autotrophic nitrogen removal of SBR in whole process |
-
1998
- 1998-02-10 JP JP04447898A patent/JP3865172B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11226592A (en) | 1999-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Kim et al. | Integrated real-time control strategy for nitrogen removal in swine wastewater treatment using sequencing batch reactors | |
| de la Vega et al. | New contributions to the ORP & DO time profile characterization to improve biological nutrient removal | |
| US6527956B1 (en) | Method for regulating aeration during waste water biological treatment | |
| JP4229999B2 (en) | Biological nitrogen removal equipment | |
| JP3865172B2 (en) | Operation control method for aeration apparatus | |
| JP5854743B2 (en) | Operation control device and control method for sewage treatment plant | |
| US20230106586A1 (en) | Sequencing Batch Reactor Systems and Methods | |
| JPH06102195B2 (en) | Method for controlling phosphorus concentration in wastewater | |
| JPH11262777A (en) | Method for removing phosphorus in wastewater | |
| Cohen et al. | Application of computational intelligence for on-line control of a sequencing batch reactor (SBR) at Morrinsville sewage treatment plant | |
| Fiter et al. | Enhancing biological nitrogen removal in a small wastewater treatment plant by regulating the air supply | |
| KR100338510B1 (en) | Real-time control technology for wastewater treatment system | |
| JP2003088889A (en) | Method for treating sewage | |
| JP4364955B2 (en) | Operation control method of aeration equipment and sludge extraction pump | |
| KR102502858B1 (en) | Waste water treatment system with enhanced dephosphorization structure | |
| JP7103598B2 (en) | Water treatment control device and water treatment system | |
| JPH1177083A (en) | Automatic control of operation of aeration device | |
| JP2006142166A (en) | Apparatus for treating waste water biologically and method for controlling operation of the apparatus | |
| JP2000185296A (en) | Control method of operation of sludge withdrawing pump | |
| Barth | Implementation of sequencing batch reactors for municipal wastewater treatment | |
| KR20170130547A (en) | METHOD FOR CONTROLLING PROCESSING APPARATUS, PROCESSING APPARATUS AND PROCESSING PLANT | |
| JP4228186B2 (en) | Operation management method for water treatment facilities | |
| JPS63294996A (en) | Operating method for oxidation ditch | |
| JPH0975973A (en) | Method and device for adjusting sludge load and method and device for treating waste water | |
| JP2007289853A (en) | Waste water treatment method and apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20041005 |
|
| A711 | Notification of change in applicant |
Free format text: JAPANESE INTERMEDIATE CODE: A712 Effective date: 20060515 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20060926 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20060928 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091013 Year of fee payment: 3 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091013 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101013 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101013 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111013 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111013 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20121013 Year of fee payment: 6 |
|
| LAPS | Cancellation because of no payment of annual fees |