Published in Scientific Papers. Series D. Animal Science., Vol. LVI
Written by Tubagus Benito Achmad KURNANI, Yuli Astuti HIDAYATI, Eulis Tanti MARLINA
Spirulina is blue-green microalgae grows abundantly on organic matters rich water bodies. In normal condition the algae uses up the organic matters effectively and improves the quality of water through decreasing of biochemical oxygen demand (BOD5) and chemical oxygen demand (COD); while in overpopulated condition the algae may worsens water quality. This characteristic has shown that the algae can be used to improve water quality up to certain population density. However, until now this algae has not been used to improve the quality of liquid waste particularly come from beef cattle production. Therefore, the objective of study was to determine the effect of Spirulina population densities toward the reduction of BOD5 and COD of beef cattle slurry. This study was done experimentally based on Completely Randomized Design with four treatments of population density in term of dilution factors, viz.D1 = 100, D2 = 10-1, D3=10-2 and D4= 10-3. Each treatment was in four replicates. The effect of the treatments were analyzed by ANOVA, and the effect among treatments were differentiated by mean of Duncan’s Multiple Range Test. The result shows that Spirulina reached its maximum growth rates mostly on the 8th day. The treatments significantly (P< 0.5) influenced the biomass of the blue-green algae. The 10-2 dilution factor (D3) gave the highest biomas production, that is 0.243 g/L. The result also shows that the treatments significantly (P< 0.05) gave different effect toward BOD5 and COD of beef cattle slurry. The 10-2 dilution factor also provided the highest reduction rate of BOD5 and COD, i.e., 85.74% and 75.92% respectively. This findings suggest that Spirulina can be used to treat beef cattle liquid waste, in addition to obtain its biomass production.
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