Fig. 7From: Start-up of a nutrient removal system using Scenedesmus vacuolatus and Chlorella vulgaris biofilmsC. vulgaris ACUF_809, a nitrogen (NO3−-N) and phosphorus (PO43−-P) removal kinetics in the PBR under semi-batch conditions; b pH changes in the medium of the biofilm photobioreactor and c microalgal biomass growth in the medium of the biofilm PBRBack to article page