Fig. 5: The effect of temperature, pH and cell type on stirring enhancement factor, SEF. a) temperature effect at constant stirring speed (650 rpm) and pH (3) using the standard SBSB cell type; b) pH effect at constant stirring speed (650 rpm) and temperature (50C) using the standard SBSB cell type. c) effect of cell type at constant temperature (50C) and pH (3).