Solubilization of Renewable Phosphorus Sources with Organic Acids Produced by Bacillus megaterium

The aim of this work was to evaluate the effects of using B. megateriumin solubilization of phosphates from different secondary raw materials, such as fish bones, poultry bones, ashes and phosphorite, by identification of the effect of different doses of phosphorus-bearing materials on the growth of microbial cells and the effectiveness of the solubilization process. Both FTIR as well as SEM-EDX techniques were used to compare the effect of the acids on renewable phosphorus source. Two doses of mentioned materials were used: 2 and 30 g/L. The effect of solubilization was expressed as the solubilization factor (SF, %), defined as the ratio (expressed as percentage) of soluble P2O5present in the solution and total phosphorus (expressed as P2O5) introduced into solubilization medium in the solid form. The evaluated SF ranged between 0.672% obtained for phosphorite (30 g/L) and 85% for fish bones (2 g/L) with variations among different sources of phosphate and different doses used in the experiment.