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2 Archives of Control Sciences

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Modelling and control of biological anaerobic waste waters treatment processes

100%

Simeonov I.

1999

tom Vol. 9, no. 3/4

53-78

Biological anaerobic wastewater's treatment processes have been an active area of research and have attracted more attention in recent years. This is due to their ecological and energetical utilities. Increasingly important tools towards better understanding, improving process stability and supporting the widespread acceptance of anaerobic wastewater treatment processes became their mathematical modelling and automatic control. This paper is a review of mathematical models and control algorithms for these processes. After a short description of two of the most popular biochemical schemes different models are presented. In this field the attention is mainly focussed on models presented as a sets of non-linear ordinary differential equations. In the field of control after formulating the control problems, different algorithms are reviewed. Particular attention is stressed on the so-called "adaptive linearizing control" that is one of the most promising approaches, based on process models, for control of these processes.

Robust compensator control of aerobic continuous fermentation processes with state estimation

51%

Simeonov I. , Stoyanov S. , Lubenova V.

tom Vol. 13, no. 1

5-18

The paper deals with robust compensator control of continuous aerobic fermentation processes described by a set of non-linear differential equations. For design purposes the non-linear model is transformed into a linear one with interval parameters. the robust state-space compensator is designed according to the internal model principle. Biomass concentration is estimeted on-line by an observer. Substrate concentration is obtained by model-based or indirect measurement. The theoretical results are verified by simulations in different cases. Robustness and simple realisation are important features of the proposed algorithms.