Fig. 9From: Biomass production and removal of ammonium and phosphate by Chlorella sp. in sludge liquor at natural light and different levels of temperature controlReduction in a ammonium (NH4-N mg L−1) and b phosphate (PO4-P mg L−1) as a function of time in diluted sludge liquor during experiment 2 at no (NTC), partly (PTC), full temperature control (FTC) and at a controlled day temperature combined with a low night temperature (LN). Dark periods are marked as black Back to article page