Hydrodynamic cavitation-assisted continuous pre-treatment of sugarcane bagasse for ethanol production: Effects of geometric parameters of the cavitation device
| Autor: | Rafaela Medeiros Dionízio, Ruly Terán Hilares, Silvio Silvério da Silva, Salvador Sanchez Muñoz, Ruy de Sousa Júnior, C.A. Prado, Júlio César dos Santos |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Acoustics and Ultrasonics Lignocellulosic biomass Context (language use) 02 engineering and technology 010402 general chemistry 01 natural sciences Inorganic Chemistry Enzymatic hydrolysis Chemical Engineering (miscellaneous) Environmental Chemistry Radiology Nuclear Medicine and imaging Ethanol fuel Cellulose Ethanol Organic Chemistry Models Theoretical 021001 nanoscience & nanotechnology Biorefinery Saccharum 0104 chemical sciences Chemical engineering Yield (chemistry) Cavitation Fermentation Hydrodynamics 0210 nano-technology Bagasse |
| Zdroj: | Ultrasonics Sonochemistry. 63:104931 |
| ISSN: | 1350-4177 |
| Popis: | For biotechnological conversion of lignocellulosic biomass, a pre-treatment step is required before enzymatic hydrolysis of carbohydrate fractions of the material, which is required to produce fermentable sugars for generation of ethanol or other products in a biorefinery. The most of the reported pre-treatment technologies are in batch operation mode, presenting some disadvantages as dead times in the process. In this context, hydrodynamic cavitation (HC)-assisted alkaline hydrogen peroxide (AHP) pre-treatment in continuous process was proposed for pre-treatment of sugarcane bagasse (SCB). The system was designed with a main reactor containing two devices to generate cavitation by passing liquid medium through orifice plates. For SCB pretreated in continuous process, 52.79, 34.31, 22.13 and 15.81 g of total reducing sugars (TRS) per 100 g of SCB were released in samples pretreated using orifice plates with a number of holes of 24 (d = 0.45 mm), 16 (d = 0.65 mm), 12 (d = 0.8 mm) and 8 (d = 1 mm), respectively. Computational Fluid Dynamics (CFD) tools showed that 0.94 of vapor phase volume fraction and 0.19 of cavitation number were achieved at 31 m/s of throat velocity and upstream pressure of 350,000 Pa. By using pretreated SCB, 28.44 g of ethanol/L (84.31% of yield respect to theoretical value) was produced by immobilized Scheffersomyces stipitis NRRL-Y7124 in a simultaneous hydrolysis and fermentation process at high solid loading (16% S/L). Thus, HC-assisted process was proved as a promising technology for valorization of lignocellulosic biomass. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect