This includes the supply of carbon from non gaseous or carbon dioxide forms to microbial cells used in the process to reduce the inhibition of the concentrate silver. Non gaseous carbon comes from a selected carbon source in water and inorganic solid carbon compounds. Soluble organic carbon is selected from yeast, yeast and carbon extract produced by active centipede, tannery effluent, exhausted bioleaching, syrup, corn brewing, Sucre, glucose and methanol. The non gaseous carbon concentration in the reactor is kept between 10 and 600 mg / L
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