Title:
Olive Mill Leaves as a Raw Material in a Biorefinery Approach. Comparison of Sugar Recoveries after Delignification by Alkaline-Peroxide and Organosolv Pretreatments
Author(s):
Ruiz, E., Romero, I., López-Linares, J.C., Mondaray, J., Díaz-Villanueva, M.J., Cara, C., Moya, M., Castro, E.
Document(s):
Paper
Poster
Abstract:
Olive mill leaves (OML), which are generated during olive harvesting and that have to be separated from olives before the olive oil extraction process in olive mill industry, has been considered as feedstock in a biorefinery approach to obtain bioethanol from structural sugars and other added value chemicals as antioxidants compounds. In this work, different delignification pretreatments have been investigated to increase the enzymatic digestibility of OML cellulose: organosolv pretreatment with 50% (v/v) of ethanol using 1% w/v sulphuric acid as catalysis at 150 and 190 ºC, and oxidative-alkaline treatment at 80ºC during 60 minutes with different solid loadings (5 and 10%). Both kinds of pretreatments were also applied after an aqueous extraction step of the raw material at 130ºC during 60 minutes. Oxidative-alkaline treatment produced delignification yields up to 78%. Nevertheless the high removal of lignin did not result in better saccharification yields with a maximum of 69% of cellulose digestibility with both OML and extracted OML, but with higher glucose losses during the delignification in the case of extracted OML. Better results were obtained with organosolv pretreatment, with sacharification yields between 80 and 95% in the conditions range assayed with limited delignification yields ranging between 42 and 59%.
Keywords:
bioethanol, enzymatic hydrolysis, organosolv pretreatment, delignification, olive leaves, alkaline-peroxide treatment
Topic:
Biomass Conversion Technologies for Liquid and Gaseous Fuels, Chemicals and Materials
Subtopic:
Biorefineries
Event:
25th European Biomass Conference and Exhibition
Session:
3BV.3.30
Pages:
1271 - 1276
ISBN:
978-88-89407-17-2
Paper DOI:
10.5071/25thEUBCE2017-3BV.3.30
Price:
FREE
