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Sedimentation is a crucial phenomenon in recovering water from slurries byseparating solid-liquid. Thickeners and sedimentation columns are equipmentswidely used in the process industry to reclaim water from process slurries.This contribution addresses the problem of controlling the turbidity of therecovered water in a sedimentation column by manipulating the underflow. Thephenomenological model describing the turbidity is too complex to be used in acontrol strategy, and it is difficult to identify its parameters using plantmeasurements. This work proposes an empirical piece-wise time-delay model formodeling the turbidity at the top of the column to circumvent these problems. Asystematic design procedure is developed to tune a Proportional Integralcontroller guaranteeing closed-loop stability for systems modeled as apiece-wise time delay model. Experiments in a pilot plant validate thetheoretical results and illustrate the control performance under variousoperational scenarios.

Turbidity Control in Sedimentation Columns by Direction Dependent Models