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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/3462


    Title: CFSBR好氧相/缺氧相即時控制系統改良之研究;Improvement of an Automation System in Aerobic and Anoxic Phases in CFSBRs
    Authors: 鄭俊忠;Chen-Chun Chung
    Contributors: 環境工程研究所
    Keywords: 適應性控制–連續流循序批分式活性污泥系統;即時控制;溶氧轉換率;攝氧率;real–time monitoring and control;Adaptive–Control Continuous Flow Sequencing Bat;OUR;oxygen transfer rate
    Date: 2005-07-09
    Issue Date: 2009-09-21 12:16:39 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 適應性控制–連續流循序批分式活性污泥系統(Adaptive Control–Continuous Flow Sequencing Batch Reactor, AC–CFSBR)在自動監測控制系統的發展上,結合電腦資訊化及程序控制自動化等技術,已有不錯的控制成效。然而以往對好氧相的即時控制(Real–time control)採用ORP與pH折點,做為好氧相的轉相依據,長期的操作結果顯示,曝氣量的改變易使折點偵測不易,使好氧相的終點判斷不明顯,此外,過去好氧相最大及最小操作時間的設定,主要為操作人員的經驗,雖然好氧時間較短可縮短好氧操作時間,但卻使好氧性的微生物生長時間不足,造成污泥沈降性不佳,最後導致系統失敗。是故本研究主要建立線上量測溶氧轉換率(a值)的方法,利用溶氧關係平衡式獲得攝氧率之監測,並做為好氧相終點判斷之依據。研究結果顯示,利用好氧初期溶氧上升階段,所得到的最大溶氧轉換率做為曝氣控制及攝氧率監測,具有不錯的成效。此外,本研究利用不同型態的自變數建立模擬溶氧轉換率之迴歸式,用來預估實際a值有相同高的準確度。另一方面,研究發現好氧相幾近完成時,攝氧率有折點發生且溶氧濃度升高,可做為好氧相終點的判定依據。最後,本研究發展一線上即時量測COD的技術,結果顯示實際值與即時監測值的誤差大約為± 5 mg/l,此能提供未來控制策略之參考。 AC–CFSBR (adaptive control–continuous flow sequencing batch reactor) has been well established with data monitoring and processing as well as process automation. After long-term operation, it is found that the ORP and the pH are not proper real-time-endpoint-control parameters for the aerobic phase. Short aeration time would save operation time but lead to poor settling of the sludge, while long aeration time would lower the substrate loading and enhance the growths of filamentous bacteria. In this study, a real-time monitoring method of oxygen utilization rate (OUR) was developed based on mass balance and transfer rate of oxygen, which are both obtained by on-line monitored DO data. The oxygen transfer rate was then used to control the amount of aeration so the required DO can be maintained. Another objective is to find a better parameter to monitor the endpoint of the aerobic phase. The result showed that using the maximum oxygen transfer rate (a value) in the beginning of the aerobic phase to calculate OUR and to control the aeration can increase the stability of the system. STATISTICA was used to obtain the empirical oxygen transfer rate equation, which was found very accurate when predicting a value for the later runs. In addition, it was found the OUR dropped when the DO increased quickly to the required DO, which is because the oxidation of substrate was almost complete; therefore, this point can be considered the endpoint of the aeration phase and the OUR is a better parameter for aerobic-phase-endpoint monitoring.
    Appears in Collections:[環境工程研究所 ] 博碩士論文

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