Large amounts of coffee grounds are disposed of worldwide. In this regard, we have studied the coffee grounds and the ability of Aspergillus oryzae to grow and absorb as the only carbon source, producing bioethanol. The results show that as the concentration of coffee grounds increases, so does the amount of bioethanol. The largest amount is obtained with 50 g l~(-1) precipitate, after which the amount gradually begins to decrease. The data confirm that microorganisms are able to absorb coffee waste and turn it into useful organic products.
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