Nonlinear on-line Estimation and Adaptive Control of a Wastewater Treatment Bioprocess

M. Roman, D. Selisteanu. Nonlinear on-line Estimation and Adaptive Control of a Wastewater Treatment Bioprocess // Electronics and Electrical Engineering. - Kaunas: Technologija, 2012. - No. 1(117). - P. 23-28. This work approaches the on-line estimation and adaptive control of a wastewater treatment process, which takes place inside a bioreactor. This bioprocess is highly nonlinear, the available state measurements are lack and moreover the reaction kinetics is not perfectly known. The kinetic parameters are estimated by using high-gain nonlinear observers and the unavailable states are reconstructed by using an asymptotic state observer. The control goal is to keep a low level of pollutant concentration. An adaptive control law is designed by combining a linearizing controller with the nonlinear observers. Numerical simulations are included to test the performances of the proposed algorithms. III. 8, bibl. 17 (in English; abstracts in English and Lithuanian).