Effect of frequency and reaction time in focused ultrasonic pretreatment of energy cane bagasse for bioethanol production.
Pretreatment of lignocellulosic biomass is a critical steps in bioethanol production. Ultrasonic pretreatment significantly improves cellulose hydrolysis increasing sugar yields, but current system designs have limitations related to efficiency and scalability. This study evaluates the ultrasonic pretreatment of energy cane bagasse in a novel scalable configuration and by maximizing coupling of ultrasound energy to the material via active modulation of frequency. Pretreatment was conducted in 28% ammonia water mixture at a sample:ammonia:water ratio of 1:0.5:8. Process performance was investigated as a function of frequency (20, 20.5, 21kHz), reaction time (30, 45, 60min), temperature, and power levels for multiple combinations of ammonia, water and sample mixture. Results indicated an increased enzymatic digestibility, with maximum glucose yield of 24.29g/100g dry biomass. Theoretical ethanol yields obtained ranged from 6.47 to a maximum of 24.29g/100g dry biomass. Maximum energy attainable was 886.34kJ/100g dry biomass.
Department of Biological and Agricultural Engineering, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, United States.
Niyaz Ahamed
NA
Methrath Liyakathali
Department of Biological and Agricultural Engineering, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, United States.
Pranjali D
PD
Muley
Audubon Sugar Institute, LSU AgCenter, St. Gabriel, LA 70776, United States.
Giovanna
G
Aita
Department of Biological and Agricultural Engineering, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, United States. Electronic address: DBoldor@agcenter.lsu.edu.
Dorin
D
Boldor
D056804:Biofuels; D018533:Biomass; D002482:Cellulose / Q000737:chemistry / Q000378:metabolism / Q000528:radiation effects; D000431:Ethanol / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism; D031786:Saccharum / Q000737:chemistry*; D013010:Sonication / Q000379:methods*; D013997:Time Factors; D000069453:Ultrasonic Waves
D056804:Biofuels; D000431:Ethanol; D002482:Cellulose; C027433:bagasse; D005947:Glucose
Ammonium hydroxide; Energy cane; Enzymatic hydrolysis; Lignocellulose; Ultrasonic pretreatment