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VFA and COD regulation in a two-stage anaerobic digester used in the treatment of tequila vinasses

Hugo Oscar Méndez-Acosta, Victor González-Álvarez, Juan Paulo García-Sandoval, Armando Campos-Rodríguez
In this work, a hybrid cascade control scheme is proposed to regulate the VFA and COD concentrations in a two-stage (acidogenic-methanogenic) anaerobic digester used in the treatment of tequila vinasses. The inner loop contains a continuous nonlinear control scheme to regulate the VFA concentration of the acidogenic bioreactor using conductivity measurements to estimate on-line the VFA concentration in the acidogenic bioreactor, while the outer loop uses a discrete nonlinear controller that regulates the COD concentration of the methanogenic bioreactor by using sampled delayed off-line COD measurements. Results show that the proposed control scheme is able to achieve both, the VFA and COD regulations, in the face of load disturbances, set-point changes and control input saturations.
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