title: Closed-loop identification and control application for dissolved oxygen concentration in a full-scale coke wastewater treatment plant.
abstract: 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.
authors.affiliation: Department of Chemical Engineering, Automation Research Center, Pohang University of Science and Technology, San 31 Hyoja Dong, Pohang, 790-784, Korea.
authors.forename: C K
authors.initials: CK
authors.lastname: Yoo
authors.forename: J H
authors.initials: JH
authors.lastname: Cho
authors.forename: H J
authors.initials: HJ
authors.lastname: Kwak
authors.forename: S K
authors.initials: SK
authors.lastname: Choi
authors.forename: H D
authors.initials: HD
authors.lastname: Chun
authors.forename: I
authors.initials: I
authors.lastname: Lee
mesh_terms: D018533:Biomass; D003031:Coal; D003198:Computer Simulation; D004867:Equipment Design; D007220:Industrial Waste; D008962:Models, Theoretical; D010100:Oxygen / Q000032:analysis*; D012984:Software; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*
chemical_list: D003031:Coal; D007220:Industrial Waste; D010100:Oxygen