Abstract
Abstract this paper is concerned with a pilot-scale fixed-bed biofilter used for nitrogen removal from municipal wastewater. Process dynamics is described by a set of mass balance partial differential equations, which allow the evolution of the several component concentrations along the biofilter axis to be reproduced. Based on sets of experimental data collected over a several-month period, unknown model parameters are estimated by minimizing an output error criterion. The resulting distributed parameter model and a few pointwise measurements of nitrate, nitrite, and ethanol concentrations can be used to design observers, which allow the unmeasured biomass concentrations to be reconstructed on-line. First, it is demonstrated that asymptotic observers are unsuitable for the model structure. Then, a receding-horizon observer is designed and tested, which shows very satisfactory performance.
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