Automatic control for do and pH in the activated sludge process in a coke wastewater treatment plant |
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| Affiliation: | 1. Dept. of Civil Engineering Science, University of Johannesburg, Auckland Park Kingsway Campus, P.O. Box 524, Auckland Park 2006, Johannesburg, South Africa;2. Dept. of Civil Engineering, University of Toronto, 35 St. George St., Toronto, ON M5S 1A4, Canada;1. Faculty of Agriculture, Agriculture and Forestry University, 056-591655 Chitwan, Nepal;2. Graduate Program in Ecology, Evolution and Biodiversity, School of Health and Life Sciences, Pontifical Catholic University of Rio Grande do Sul, Ipiranga Ave., 6681, 90619-900 Porto Alegre, RS, Brazil;1. Department of Engineering Design, Indian Institute of Technology Madras, Chennai, India;2. Department of Mechanical Engineering, University of Minnesota, Minneapolis, USA |
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| Abstract: | The objective of this study is to develop an automatic control system for dissolved oxygen (DO) and pH of the activated sludge process in a coke wastewater treatment plant. A discrete type autotuned proportional-integral (PI) controller using an auto-regressive exogenous (ARX) model as a process model was developed to maintain the DO concentration in aerators by controlling the speed of surface aerators. Also a nonlinear pH controller using the titration curve was used to control the pH of influent wastewater. This control system was tested in a pilot scale plant. During this pilot plant experiment, there was small deviation of pH and the electric power consumption of surface aerators was reduced up to 70% with respect to the full operation when the DO set point was 2 mg/1. For real plant operation with this system, the discrete PI controller showed good tracking for set point change. The electricity saving was more than 40% of the electricity consumption when considering surface aerators. As a result of maintaining the DO constantly at the set point by the automatic control system, the fluctuation of effluent quality was decreased and overall improvement of the effluent water quality was achieved. |
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