Abstract
The general mathematical models of secondary clarifiers in wastewater treatment processes are usually complicated and cannot be used to construct control systems directly. A method based on a double exponential settling equation is proposed in this paper to construct a kind of mixed logic dynamic model for secondary clarifiers. The advantage of this handling method is that it can extend the control design method of hybrid systEMTo that of activated sludge processes, form a unified optimal control problem expression containing technical indexes, procedure characteristics and environmental pro tection regulations. This new model representing method will lay the foundation of plantwide control design.
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