In order to overcome of expensive and extensive use of chemical phosphate fertilizers, in this work we investigated the potential of phosphate dissolution by sustainable industries impurities recovery using Azotobacter vinelandii, dissolution of phosphates impurities from two Egyptian iron ores Bahraiya Oasis and Aswan, A. vinelandii produces low molecular weight organic acids, which attack the phosphate structure in iron ores and convert phosphorus from non-utilizable form to the plants. The objective of the present work was to bioleach of phosphate impurities and study the factors influence on dissolution of phosphate content in iron ores Bahraiya oasis and Aswan, Egypt. The optimum factors increase bioleaching of phosphate impurities from two Egyptian iron ores were three days incubation time, cultivated in modified PVK medium for dissolution of phosphate from two iron ore, 0.1 × 1029 colony forming unit of A. vinelandii, 0.5 g iron ore concentration, at incubation temperature 30°C, ammonium oxalate as nitrogen source, glucose as carbon source, no significant effect of addition factor, also there is decreasing in pH and increases in electric potential, initial pH 7, which the leaching efficiency of phosphate content in iron ore reaches to 73.4% and 60.53% for Bhraiya Oasis and Aswan and respectively.
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