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Environmental Engineering Research 1998;3(2): 115-121.
Control of the Dissolved Oxygen Concentration in the Activated Sludge Process
Dae-Sung Joo, and Heekyung Park
Department of Civil Engineering, KAIST, Taejon Korea, 305-701
Corresponding Author: Dae-Sung Joo ,
Received: May 6, 1998;  Accepted: June 3, 1998.
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The main problems in the dissolved oxygen (DO) control ot the activated sludge process are the nonlinearity of the DO dynamics and the estimation of the parameters to represent the state of the concerning process. This review paper followed up and summarized the several control strategies to solve the nonlinearity of the DO dynamics and the parameter estimation methodologies to estimate the respiration rate and the axygen transfer rate. With the development of computer and the sensor technologies, the more advanced control techniques have been applied to the automatic DO controL Recently, the DO set-point control in the aeration tank has also been suggested to facilitate the nitrification and the denitrification in the following processes. The possivility of the strict DO control shown in this review paper will be able to spur the application capavility to the DO set-point control
Keywords: DO control | nonlinearity | respiration rate | oxygen transfer rate | parameter
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