Fig. 3
From: Spatial monitoring of hydrolysis in a plug-flow bioreactor: a support for flexible operation?
Linear Pearson correlation of the on-line measurements with metabolite concentrations in PFR2 at the inlet, center and outlet port. Depicted are the weekly average values from 53 weeks of operation with different feedstock, HRT variation, changes in microbial metabolism and under thin-sludge recirculation. Correlation coefficients ≥ 0.7 are marked for visualization of the location-dependent correlation pattern; SCCA short-chain carboxylic acids, BA butyric acid, LA lactic acid