Cultivation of Spirulina platensis using raw piggery wastewater for nutrients bioremediation and biomass production: effect of ferrous sulfate supplementation

In the present study, an integrated process of raw piggery wastewater treatment and Spirulina platensis biomass production was proposed and effect of ferrous sulfate supplementation on S. platensis growth and biochemical composition was primarily investigated. Results showed that supplementation of 0.05 g L –1 ferrous sulfate in the raw piggery wastewater could increase maximum biomass and chlorophylls production to 98.67 and 0.156 mg L –1 d –1 , respectively, compared to 74.22 and 0.134 mg L –1 d –1 , respectively, of the control. Moreover, protein, total carbohydrate, total lipids and iron content of the harvested biomass ranged from 45.31%–55.15%, 8.53%–12.32%, 10.22%– 11.49% and 1.31–2.03 mg g –1 , respectively, indicating that ferrous sulfate supplementation is an effective approach to enhance S. platensis biomass productivity and increase iron content in S. platensis biomass, which facilitates to lower S. platensis biomass production cost and upgrade biomass value.