Syrup resulting from date by-products constitutes a favorable medium for yeast development,
owing to its sugar composition; it was hence tested for ethanol production. Three
yeasts, Saccharomyces cerevisiae, Zygosaccharomyces rouxii and Candida pelliculosa, were
selected for ethanol production on dates syrup. In batch fermentation, the ethanol concentration
depended on the initial sugar concentration and the yeast strain. For an initial
sugar concentration of 174.0 ± 0.2 kg m3, maximum ethanol concentration was
63.0 ± 0.1 kg m3 during S. cerevisiae growth, namely higher than the amounts achieved
during Z. rouxii and C. pelliculosa growth, 33.0 ± 2.0 kg m3 and 41.0 ± 0.3 kg m3 respectively.
Contrarily, only Z. rouxii was able to grow on 358.0 ± 1.0 kg m3 initial sugar amount,
resulting in 55.0 ± 1.0 kg m3 ethanol produced.