The objective of this paper is to apply a closed-loop identification to actual dissolved oxygen control system in the coke wastewater treatment plant. It approximates the dissolved oxygen dynamics to a high order model using the integral transform method and reduces it to the first-order plus time delay (FOPTD) or second-order plus time delay (SOPTD) for the PID controller tuning. To experiment the process identification on the real plant, a simple set-point change of the speed of surface aerator under the closed-loop control without any mode change was used as an activation signal of the identification. The full-scale experimental results show a good identification performance and a good tracking ability for set-point change. As a result of improved control performance, the fluctuation of dissolved oxygen concentration variation has been decreased and the electric power saving has been accomplished.
Closed-loop identification and control application for dissolved oxygen concentration in a full-scale coke wastewater treatment plant
C. K. Yoo, J. H. Cho, H. J. Kwak, S. K. Choi, H. D. Chun, I. Lee; Closed-loop identification and control application for dissolved oxygen concentration in a full-scale coke wastewater treatment plant. Water Sci Technol 1 April 2001; 43 (7): 207–214. doi: https://doi.org/10.2166/wst.2001.0426
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