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Model-based design of a software sensor for real-time diagnosis of the stability conditions in high-rate anaerobic
Ion Irizar1, Enric Roche2, Sergio Beltrán1
1Ceit, Manuel Lardizabal 15, 20018, Donostia/San Sebastián, Spain; Universidad de Navarra, Tecnun, Manuel Lardizabal 13, 20018, Donostia/San Sebastián, Spain.
Abstract:
Internal Circulation (IC) anaerobic systems are especially suitable when plant designs that involve both small footprints and high organic loading rates (>25 kg COD m-3 d-1) are required. However, given that operating anaerobic processes at high organic loads increases their vulnerability to external disturbances, real-time indicators of the stability conditions become particularly pertinent for IC reactors. This paper addresses the design and full-scale validation of a software sensor that uses only feeding flow-rate and biogas flow-rate measurements to classify the operating conditions of the reactor as "strongly", "moderately" or "weakly" stable. A simulation-based procedure was used to design the software sensor and configure its parameters. Then, the performance of the software sensor was tested under real conditions in a full-scale IC reactor of 1679 m3 installed in a recycled paper mill (RPM).
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