A positive observer for the chemostat model with biogas measurement

In anaerobic digestion plants, it is often crucial to measure state variables such as the substrate or biomass densities for monitoring process. But, this task can be very difficult achieve because sensors are sometimes unavailable, unreliable expensive. For these reasons software sought instead, using indirect measurements. paper, we design a new observer chemostat model with single measurement of biogas flow rate. This positive and show its adjustable convergence. Through simulations also robustness under noise The key point construct non-linear hidden symmetries in framework theory symmetry preserving nonlinear systems. effectiveness proposed methodology shown through simulations.