Integration of NIRS and PCA techniques for the process monitoring of a sewage sludge anaerobic digester

► FT-NIRS with PCA and PLS-R to monitor stability of sewage sludge anaerobic digestion. ► Control charts were successfully produced for the sewage sludge digester. ► Use of FT-NIRS derived data allows realtime monitoring of key parameters. ► Advanced warning of digester instability is possible with use of feed characteristics.