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Simulator of a Sludge Dryer From Sewage Treatment Plants

A strategy for the use of low-cost biomass, such as the sludge produced in Sewage Treatment Plants for the formulation of a solid fuel with high added value, has been the objective of the present work. To accomplish this, the design of a sludge dryer for these plants is being evaluated, with the need to reduce the humidity of the sludge at constant temperature with constant airflow. The work presents the design of a simulator for the dryer of sludge from sewage treatment plants from a prototype on a reduced scale in terms of its size, so as to subsequently reproduce it on a productive scale. First, the drying process is modeled phenomenologically for the proposed prototype, and thus to allow the evaluation of the main process variables; the optimal profiles of the process variables that allow to dry the sludge without decreasing its calorific value due to the loss of organic material are identified. As a result, it is the design of the validated simulator with experimental data where new control strategies, optimization and parametric sensitivity can be tested, to achieve a robust control for the sludge dryer under study.