Utilization of Cassava (Manihot esculenta) stem for bioethanol production [manuscript]
| dc.contributor.author | Aira Mae M. Ariola | |
| dc.date.accessioned | 2025-09-29T02:54:19Z | |
| dc.date.available | 2025-09-29T02:54:19Z | |
| dc.date.issued | 2019 | |
| dc.description.abstract | The general objective of this study was to utilize cassava stem for bioethanol production. It aimed to determine the effect of the different boiling duration of liquid hot water pretreatment in the sugar concentration after enzymatic hydrolysis, to evaluate the effect of the different loading of yeast on the fermentation of the hydrolysates, and to determine the actual ethanol yield and alcohol recovery of the fermented hydrolysates. For the study of pretreatment, cassava stem was subjected to liquid hot water pretreatment with different boiling duration of 5 minutes, 10 minutes, and 15 minutes. For the study of fermentation, different amount of yeast were used to ferment the liquid hot water pretreated hydrolyzed cassava stem. Different amount of yeast used were 1 g/L, 1.5 g/L, and 2 g/L of broth. Results showed significant differences in the increase in sugar concentration of the biomass subjected to different boiling duration in the LHW pretreatment process. Results revealed that biomass without LHW pretreatment obtained the lowest increase in sugar concentration after hydrolysis which is 0.47 Brix while biomass pretreated for 15 minutes attained the highest increase in sugar concentration of 1.27 Brix. The result was used for the study of fermentation in which two conditions were considered, boiling duration of 10 minutes and 15 minutes prior to hydrolysis. Results showed that using different yeast loading had significant effect on the reduction of sugar concentration, actual ethanol yield, and on the alcohol recovery. Yeast loading of 1.5 grams per liter of hydrolyzed cassava stem attained the highest reduction in sugar concentration, highest actual ethanol yield, and alcohol recovery for both conditions. | |
| dc.identifier.uri | http://granarium.clsu.edu.ph/handle/123456789/593 | |
| dc.language.iso | en | |
| dc.relation.supervisor | MARLON T. DELOS SANTOS, M.Sc. | |
| dc.title | Utilization of Cassava (Manihot esculenta) stem for bioethanol production [manuscript] | |
| dc.type | Thesis |