3.1. Ethanol production from PPW
3.1.1. Acidic hydrolysis
After acidic hydrolysis the total amount of sugars was
19.37 g L1 while the fermentable reducing sugar was 18.15 g L1,
corresponding to 0.36 g released sugar per g of raw dry PPW. At
the end of fermentation total sugars were 4.34 g L1 and fermentable
reducing sugars 4.06 g L1. Therefore, the reducing sugars consumed
were 14.08 g L1. The final pH at the end of fermentation
was 3.89.