Modeling of Sewage Sludge Flow in a Continuous Paddle Dryer

Abstract : A model based on the theory of Markov chains has been developed to represent the residence time distribution (RTD) of municipal sewage sludge in a continuous paddle dryer. The flow of dry solids is described by a chain of n perfectly mixed cells, n corresponding to the number of paddles attached to the shaft. The transition probabilities between the cells are governed by two parameters: the parameter of internal recirculation, R, and the solids hold-up, Hu. In the absence of available correlation, both parameters are identified by fitting the model to experimental RTD data. The model demonstrates its ability to describe the sludge flow in a continuous lab-scale paddle dryer. A sensitivity analysis highlights that R is critical for the treatment uniformity while Hu controls the mean residence time and thus the final moisture content.
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Mathieu Milhé, Christophe Charlou, Martial Sauceau, Patricia Arlabosse. Modeling of Sewage Sludge Flow in a Continuous Paddle Dryer. Drying Technology, Taylor & Francis, 2015, 33 (9), pp.1061-1067. ⟨10.1080/07373937.2014.982252⟩. ⟨hal-01168605⟩

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