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Batch biohydrogen production from dilute acid hydrolyzates of fruits-and-vegetables wastes and corn stover as co-substrates

By Santiago Rodríguez-Valderrama, Carlos Escamilla-Alvarado, Jean-Pierre Magnin, Pasiano Rivas-García, Idania Valdez-Vazquez and Elvira Ríos-Leal

Abstract

International audienceFruits-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 52 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 ºC in a 3 2 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 acid hydrolyzates proved to be 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 production of hydrogen presented net revenues of 0.009 USD per kg of co-substrates (wet basis), 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

Topics: dark fermentation, dilute acid, factorial experimental design, hydrolyzates, overliming, [SDV.BIO]Life Sciences [q-bio]/Biotechnology, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering
Publisher: 'Elsevier BV'
Year: 2020
DOI identifier: 10.1016/j.biombioe.2020.105666
OAI identifier: oai:HAL:hal-02951141v1
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