4. Conclusions
It is evident that enzymatic hydrolysis of PPW liberates a higher
amount of fermentable reducing sugar compared to hydrochloric
acidic hydrolysis. The enzyme combination featuring the highest
release of reducing sugar, was (g) Ternamyl 0.24 KNU + Viscozyme
12 FBGU + Celluclast 1% with 18.48 g L1.With this combination, at
the end of fermentation the reducing sugars were 1.93 g L1.
Therefore, the sugars consumed were 16.55 g L1. Ethanol production
was 7.58 g L1 and ethanol yield corresponded to 91.6% the
max theoretical yield.
The results demonstrated that PPW, a by-product of the potato
industry, could be efficiently utilized for ethanol production with
simultaneous reduction of waste by-product. The production of
ethanol from PPW represents an alternative, readily manageable
option; the feasibility of implementing this technique will be further
investigated by means of a larger scale technico-economical
study. Moreover, the availability of manufacturers to become involved
in this project and to devote resources to its implementation
will provide a significant contribution.
Acknowledgements
The authors wish to thank Mrs. Malli Basiliki and Mrs.
Chaidemenaki Katerina for their valuable help in the analytical
work.