Two-steps microwave-assisted treatment on acid hydrolysis of sago pith for bioethanol production

International Conference on Biomass: Technology, Application, and Sustainable Development

生物科学;能源学;经济学

Sunarti, T.C.^1 ; Yanti, S.D.^1 ; Ruriani, E.^2

Department of Agroinustrial Technology, Faculty of Agricultural Technology, Bogor Agricultural University, Indonesia^1

Department of Technology of Agricultural Products, Faculty of Agricultural Technology, University of Jember, Indonesia^2

关键词: Bio-ethanol production;    Bioethanol fermentations;    Conventional treatments;    Ethanol production;    Heterogeneous substrates;    Issatchenkia orientalis;    Microwave energies;    Microwave-assisted treatments;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/65/1/012052/pdf
DOI  :  10.1088/1755-1315/65/1/012052

学科分类：生物科学（综合）

来源: IOP

【 摘 要 】

Sago is a genus of palm that can be utilized to produce fermentable sugars as substrate for bioethanol. Sago pith is a heterogeneous substrate consists of starch and fiber. Acid hydrolysis by microwave heating radiation can break down starch and fibers together in a very short time, so it is considered to be very efficient process. The use of microwave energy (as power level) and variation of heating time can produce fermentable sugar with certain characteristics. This study included the preparation and analysis of sago pith flour; process of acid hydrolysis (0.3 M and 0.5 M H2SO4) using two steps microwave heating, first with power level 30% (1, 2 and 3 min) and second with power level 70% (3 min); and ethanol production. The conventional treatment (autoclaving at 121°C for 15 min) was carried for the comparison. The highest fermentable sugar (105.7 g/l) was resulted from microwave heating with power level 30% for 2 min followed by the power level 70% for 3 min. This hydrolyzate then used as substrate for bioethanol fermentation and partially neutralized (pH 3, 4, 5) by using yeast Issatchenkia orientalis, and the highest ethanol (2.8 g/l) was produced in pH 5.