Title:
Fuel Ethanol from Rice Straw: Pretreatment-Hydrolysis-Fermentation
Author(s):
Tawfik, S.R., Sorour, M. H., Abulnour.A.M, Mitry.N.R, Elsangedy.A
Document(s):
Paper
Abstract:
This work is concerned with the preparation of fuel ethanol from rice straw as a typical lignocellulosic material produced in enormous quantities at all rice producing countries. In Egypt, about 3 million tons of rice straw is produced annually. Most of these are openly burnt causing severe environmental problems. The approach adopted essentially comprises : pretreatment of washed and shredded rice straw using alkaline and /or acidic methods, hydrolysis using several types of cellulose enzymes including Viscozyme L, Validase TR and the newly developed Cellic® CTec2, fermentation using Saccharomyces Cerevisiae. Simultaneous Saccharification and Fermentation SSF and Sequential Hydrolysis Fermentation SHF have been both investigated. Laboratory and 5 liter reactors have been used for experimental investigations. Pretreatment and enzymatic hydrolysis has been investigated at several operating conditions followed by SSF or SHF. Scaling-up experiments have been conducted on 20 liters computerized and 100 liters fermenters. Innovative approaches including multistage hydrolysis and enzyme feeding strategies have been investigated. Results indicated that optimum conditions have been obtained using a feeding strategy comprising enzyme addition with a dose of about 4 FPU/gm of Cellic®CTec2 at 50oC for 24 hrs followed by fermentation at 37-38oC for other 72 hrs. Ethanol concentration reached about 28-30 gm/l with a recovery exceeding 80% relative to cellulose content. It is concluded that prospects for fuel ethanol from rice straw is very high especially with the advances in enzymes development.
Keywords:
fermentation, hydrolysis, pilot plant, rice straw, enzymes
Topic:
Biomass Conversion Technologies for Heating, Electricity and Chemicals
Subtopic:
Biochemical conversion
Event:
19th European Biomass Conference and Exhibition
Session:
VP2.6.30
Pages:
1769 - 1773
ISBN-13:
978-88-89407-55-4
ISBN-10:
88-89407-55-7
Paper DOI:
10.5071/19thEUBCE2011-VP2.6.30
Price:
FREE
