The growth of LEB-52 and PARACAS strains of Spirulina platensis cyanobacteria was studied using synthetic swine wastewater. The effects of medium dilution (0 and 50%) and sodium bicarbonate addition to the medium (0 and 3g/L) were initially investigated. In this step, it was used a complete Factorial Planning 2³. In the second step, the medium was diluted at 80, 50 and 20% and it was used a Factorial Planning 3¹x2¹. The cultivation was carried out at 30°C, with photophase of 12 hours. The maximum biomass concentration and maximum specific growth rate were assessed, with the results being evaluated through Analysis of Variance. In first step, the greater biomass concentration (0.55g/L) was obtained with strain LEB-52, in synthetic swine wastewater diluted at 50% and without the sodium bicarbonate addition, as supplementation of the carbon source. In the second step, the greater biomass concentration was 0.35g/L using strain PARACAS and synthetic swine wastewater diluted at 80%. The two strains studied can grow in the synthetic swine wastewater and cyanobacteria growth is enhanced by medium dilution.
Spirulina platensis; cyanobacteria; swine
