Model-Based Process Monitoring of Algae Cultures Using eve Software

Figure 1: Observer validation

In bioreactor processes, the on-line monitoring of key parameters relies on the use of adequate sensors. In this article, we implement model-based software sensors to monitor nitrate concentrations in an algae batch process. Nitrate concentration is a crucial component in algae growth, and its assessment is used to achieve optimal growth conditions or to determine optimal harvest times. Batch cultivation of the algae Chlamydomonas reinhardtii is carried out in a Labfors 5 airlift photobioreactor provided by INFORS-HT. By means of an extended Kalman–Filter observer scheme, the software sensor is embedded in an eve software platform, which offers a communication structure with the Labfors reactor and enables an operator to implement real-time code for monitoring.

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