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• W2332172300 startingPage "1139" @default.
• W2332172300 abstract "We investigate the question of optimal substrate removal in a biofilm reactor with concurrent suspended growth, both with respect to the amount of substrate removed and with respect to treatment process duration. The water to be treated is fed externally from a buffer vessel to the treatment reactor. In the two-objective optimal control problem, the flow rate between the vessels is selected as the control variable.The treatment reactor is modelled by a system of three ordinary differential equations in which a two-point boundary value problem is embedded. The solution of the associated singular optimal control problem in the class of measurable functions is impractical to determine and infeasible to implement in real reactors. Instead, we solve the simpler problem to optimize reactor performance in the class of off-on functions, a choice that is motivated by the underlying biological process. These control functions start with an initial no-flow period and then switch to a constant flow rate until the buffer vessel is empty. We approximate the Pareto Front numerically and study the behaviour of the system and its dependence on reactor and initial data.Overall, the modest potential of control strategies to improve reactor performance is found to be primarily due to an initial transient period in which the bacteria have to adapt to the environmental conditions in the reactor, i.e. depends heavily on the initial state of the dynamic system. In applications, the initial state, however, is often unknown and therefore the efficiency of reactor optimization, compared to the uncontrolled system with constant flow rate, is limited." @default.
• W2332172300 created "2016-06-24" @default.
• W2332172300 creator A5014001953 @default.
• W2332172300 creator A5075835719 @default.
• W2332172300 date "2014-01-01" @default.
• W2332172300 modified "2023-09-23" @default.
• W2332172300 title "On optimization of substrate removal in a bioreactor with wall attached and suspended bacteria" @default.
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• W2332172300 doi "https://doi.org/10.3934/mbe.2014.11.1139" @default.
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• W2332172300 hasPublicationYear "2014" @default.
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