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http://dx.doi.org/10.5855/ENERGY.2014.23.2.049

A Study on Energy Saving Effect from Automatic Control of Air Flowrate and Estimation of Optimal DO Concentration in Oxic Reactor of Wastewater Treatment Plant  

Kim, Min Han (PANGAEA21, Ltd.)
Ji, Seung Hee (PANGAEA21, Ltd.)
Jang, Jung Hee (Institute for advanced engineering)
Publication Information
Journal of Energy Engineering / v.23, no.2, 2014 , pp. 49-56 More about this Journal
Abstract
It is important to keep stable effluent water quality and minimize operation cost in biological wastewater treatment plant. However, the optimal operation is difficult because of the change of influent flow rate and concentrations, the nonlinear dynamics of microbiology growth rate and other environmental factors. Therefore, many wastewater treatment plants are operated for much more redundant oxygen or chemical dosing than the necessary. In this study, the optimal control scheme for dissolved oxygen (DO) is suggested to prevent over-aeration and the reduction of the electric cost in plant operation while maintaining the dissolved oxygen (DO) concentration for the metabolism of microorganisms in oxic reactor. For optimal control, The oxygen uptake rate (OUR) is realtime measured for the identification of influent characterization and the identification of microorganisms' oxygen requirement in oxic reactor. Optimal DO seT-Point needed for the microorganism is suggested based on real time measurement of oxygen uptake of microorganism and the control of air blower. Therefore, both stable effluent quality and minimization of electric cost are satisfied with a suggested optimal setpoint decision system by providing the necessary oxygen supply requirement to the microorganisms coping with the variations of influent loading.
Keywords
wastewater treatment plant; DO optimization; Air flowrate control; Energy saving;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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