Fig. 1From: Cultivation of lipid-producing microalgae in struvite-precipitated liquid digestate for biodiesel productionEffect of Mg2+ and PO43− sources and stirring time on transmittance (NH4+:Mg2+:PO43− molar ratios at 1:1.2:1.2, pH at 9.0, and constant rate at 150 rpm). Errors bars show standard deviation (n = 3)Back to article page