초록
<P><B>Abstract</B></P> <P>Hydrodynamic cavitation (HC) was adopted to assist alkaline-hydrogen peroxide pretreatment of sugarcane bagasse (SCB). In the following condition: 0.29 M of NaOH, 0.78% (v/v) of H<SUB>2</SUB>O<SUB>2</SUB>, 9.95 min of process time and 3 bar of inlet pressure, 95.4% of digestibility of cellulosic fraction was achieved. To take the best use of the pretreated biomass, the overall process was intensified by way of employing a packed bed flow-through column reactor and thus enabling to handle a high solid loading of 20%, thereby leading to cellulose and hemicellulose conversions to 74.7% and 75%, respectively. In the fermentation step, a bubble column reactor was introduced to maximize ethanol production from the pretreated SCB by <I>Scheffersomyces stipitis</I> NRRL-Y7124, resulting in 31.50 g/L of ethanol, 0.49 g/g of ethanol yield and 0.68 g/L.h of productivity. All this showed that our HC-assisted NaOH-H<SUB>2</SUB>O<SUB>2</SUB> pretreatment strategy along with the process intensification approach might offer an option for SCB-based biorefineries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hydrodynamic cavitation-assisted NaOH/H<SUB>2</SUB>O<SUB>2</SUB> process is efficient to remove lignin. </LI> <LI> Addition of hydrogen peroxide accelerate the pretreatment of sugarcane bagasse. </LI> <LI> Hydrolysis at high solid loading is successfully performed in PBFT column reactor. </LI> <LI> High ethanol yield was obtained using <I>S. stipitis</I> in a bubble column reactor. </LI> <LI> Intensified process is an interesting option to make feasible SCB-biorefineries. </LI> </UL> </P>