In sugar production, model parameter estimation and controller tuning of the nonlinear clarification process are major concerns. Because industry’s is difficult nonlinear, obtaining exact using identification methods critical. For regulating identifying parameters, this work presents a state transition algorithm (STA). First, parameters for clarifier estimated normal system process. The STA the...

A Computational Fluid Dynamics (CFD) prediction procedure for computing the internal hydrodynamic behaviour of final clarifiers is presented. Calculations are carried out and presented for comparison with experimental measurements of point velocities in a shallow circular clarifier in operation at a UK waste water treatment works. The calculations compare favourably with the data and the model ...

Past Computational Fluid Dynamics(CFD) work on the Rapidorr 444 required a quantitative check of its accuracy. Factory tracer tests were used to validate the developed CFD model. Since the model was a function of its input, these parameters, particularly juice and mud densities were re-calculated over an entire season and average values used. In addition a new three-dimensional model of the Rap...

This paper presents the results of modelling to predict the effluent biological oxygen demand (BOD5) concentration for primary clarifiers using a hybridisation of unsupervised and supervised artificial neural networks. The hybrid model is based on the unsupervised self-organising map (SOM) whose features were then used to train a multi-layered perceptron, feedforward back propagation artificial...

Abstract. We consider a nonconvex conservation law modelling the settling of particles in ideal clarifier-thickener units. The flux function of this conservation law has an explicit spatial dependence that is discontinuous. Previous works by two of the authors, together with collaborators, have been aimed at providing a firm rigorous ground of mathematical (global existence and uniqueness) and ...

In the past years, lamella settlers have been used as devices for treatment by sedimentation also for storm water. Instead of just equipping a sedimentation basin with numerous lamella modules, an innovative approach for traditional separate systems is proposed. Basically, storm water is stored in a basin or tank during a rain event, while treatment is done in a small but continuously operated ...

We present a CFD model that predicts the sedimentation of activated sludge in a full-scale circular secondary clarifier that is equipped with a suction-lift sludge removal system. The axisymmetric single-phase model is developed using the general-purpose CFD solver FLUENT 6, which uses the finite-volume method. A convection-diffusion equation, which is extended to incorporate the sedimentation ...