Effect of Tofu Wastewater Addition on The Growth and Carbohydrate-Protein-Lipid Content of Spirulina platensis (RESEARCH NOTE) Article in Press

This study was conducted to investigate the effect of tofu wastewater (TW) addition on the S. platensis growth. The TW addition was varied in range of 0 – 8%v/v. The results showed that the growth rate (μ) of S. platensis at TW addition of 0, 2, 4, 6, 8 %v/v was 0.007, 0.084, 0.074, 0.088, 0.086 mg/L/d respectively. The medium with TW addition of 6%v/v (Carbon:Nitrogen:Phosphorous = 161:17:1; Carbon/Nitrogen = 9.55) was the best medium for biomass production. The growth rate of S. platensis was successfully modeled by using modified Gompertz equation (R2 = 0.93 – 0.98). In prediction through modified Gompertz, the highest maximum biomass (2.17 mg/L) was resulted from medium IV (TW of 6%v/v). Medium IV (TW of 6%v/v); II (TW of 2%v/v); III (TW of 4%v/v) resulted biomass containing the highest protein (66.62%), the highest carbohydrate (61.23%), the highest lipid (19.66%) respectively.