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.

中文翻译：

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水力空化辅助甘蔗渣连续预处理乙醇的生产：空化装置的几何参数的影响。

对于木质纤维素生物质的生物技术转化，需要先进行预处理步骤，然后再酶解该材料的碳水化合物馏分，这需要生产可发酵的糖以在生物精炼厂生产乙醇或其他产品。所报道的大多数预处理技术都处于批处理操作模式下，存在一些缺点，例如过程中的停滞时间。在此背景下，提出了在连续过程中利用水力空化（HC）辅助碱性过氧化氢（AHP）进行预处理的甘蔗渣（SCB）预处理方法。该系统设计有一个主反应器，该反应器包含两个设备，可通过使液体介质通过孔板来产生空化作用。对于连续处理的SCB，分别为52.79、34.31、22.13和15。在使用孔板进行预处理的样品中，每100克SCB释放81克总还原糖（TRS），孔板的孔数为24（d = 0.45 mm），16（d = 0.65 mm），12（d = 0.8 mm） ）和8（d = 1 mm）。计算流体动力学（CFD）工具显示，在喉速31 m / s和350,000 Pa的上游压力下，气相体积分数为0.94，空化数为0.19。通过使用预处理的SCB，乙醇/ L为28.44 g / L（84.31固定化的拟南芥NRRL-Y7124在高固含量（16％S / L）的同时水解和发酵过程中产生了固定化的拟南芥NRRL-Y7124。因此，HC辅助工艺被证明是木质纤维素生物质增值的有前途的技术。