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Batch biohydrogen production from dilute acid hydrolyzates of fruits-and-vegetables wastes and corn stover as co-substrates
Biomass & Bioenergy ( IF 5.8 ) Pub Date : 2020-07-30 , DOI: 10.1016/j.biombioe.2020.105666
Santiago Rodríguez-Valderrama , Carlos Escamilla-Alvarado , Jean-Pierre Magnin , Pasiano Rivas-García , Idania Valdez-Vazquez , Elvira Ríos-Leal

Fruits-and-vegetables wastes (FVW) and corn stover (CS) are two of the most recurred lignocellulosic biomasses used for biofuel production. In this work, the co-processing of FVW and CS for biohydrogen production was proposed and evaluated through a set of experimental designs. First, a 5 × 2 general factorial was applied on the dilute acid pretreatment at five levels of FVW:CS ratios (0:1, 1:3, 1:1, 3:1 and 1:0 dry mass basis) and two levels of the type of catalyst (HCl or H2SO4 at 0.5% in volumetric basis). Then, biohydrogen production using the dilute acid hydrolyzates was carried out in batch mode at 35 °C in a 32 factorial design, the factors being the inoculum to substrate ratio (0.8, 1.0, and 1.2 g g−1) and the initial concentration of reducing sugars (10, 13 and 16 g L−1). The effects of the type of acid catalyst and the FVW:CS ratio were significant in terms of sugars production and yield. The best catalyst was HCl for the 3:1 FVW:CS ratio, which produced monomeric sugars concentrations of 10.0, 3.7 and 2.9 g L−1 for glucose, xylose and arabinose, respectively. The hydrolyzates were suitable for biohydrogen production, reaching yields of 2.31 mol H2 mol−1glucose and hydrogen production rates of 8.83 mL H2 h−1. An economic prospection at lab scale demonstrated that hydrogen production presented net revenues of 0.009 USD per kg of co-substrates, resulting in 24% profitability of hydrogen production over its production costs. Therefore, this co-processing is an interesting proposal with further applications on biorefinery models.



中文翻译:

从果蔬废料的稀酸水解产物和玉米秸秆作为共同底物来分批生产生物氢

水果和蔬菜废物(FVW)和玉米秸秆(CS)是用于生物燃料生产的两种最常出现的木质纤维素生物质。在这项工作中,提出并通过一系列实验设计对FVW和CS用于生物制氢的协同处理进行了评估。首先,在FVW:CS比率的五个级别(0:1、1:3、1:1、3:1和1:0干燥质量)的五个级别上,对稀酸预处理应用5×2的一般阶乘。催化剂类型(HCl或H 2 SO 4的体积百分比为0.5%)。然后,在3 2因子设计中,在35°C下以分批模式使用稀酸水解产物进行生物制氢,因子为接种物与底物的比例(0.8、1.0和1.2 g g -1)和还原糖的初始浓度(10、13和16 g L -1)。酸催化剂的类型和FVW:CS比率对糖产量和收率的影响很大。最佳的催化剂是HCl,其FVW:CS比率为3:1,对于葡萄糖,木糖和阿拉伯糖,其单体糖浓度分别为10.0、3.7和2.9 g L -1。水解产物适用于生物氢生产,达到2.31 mol H 2 mol -1葡萄糖的产率和8.83 mL H 2 h -1的氢气产生速率。实验室规模的经济前景表明,制氢所产生的净收入为每千克复合基板0.009美元,因此制氢的利润率超过其生产成本。因此,这种协同处理是一个有趣的建议,可进一步应用于生物精炼模型。

更新日期:2020-07-31
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