4.7 Article

Acidic and thermal pre-treatments for anaerobic digestion inoculum to improve hydrogen and volatile fatty acid production using xylose as the substrate

Journal

RENEWABLE ENERGY
Volume 145, Issue -, Pages 1388-1398

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2019.06.134

Keywords

Dark fermentation; Kinetics; Biohydrogen; Anaerobic; Acidogenesis

Funding

  1. Sao Paulo Research Foundation (Fundacao de amparo a pesquisa do estado de Sao Paulo/FAPESP) [2013/18172-2, 2010/18463-9, 2009/15984-0]
  2. Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [09/15984-0] Funding Source: FAPESP

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Xylose is a by-product of lignocellulosic biomass processing for production of second-generation biofuels and could be suitable for bioproduct manufacturing. This paper describes an innovative approach that enables the system to achieve high yielding for hydrogen production. The study compared 4 physico-chemical pre-treatments performed in an anaerobic mixed culture (acidic, thermal, acidic-thermal and thermal acidic) to achieve an inoculum with a high-efficiency xylose to hydrogen conversion under mesophilic conditions (30 degrees C). The acidic pre-treatment was the most efficient to select microorganisms able to produce hydrogen and volatile acid from xylose. Kinetics has shown that acidic pre-treatment had a hydrogen/xylose molar yielding factor of 1.57 (molar base) and a hydrogen maximum production rate of 253 mL H-2 h(-1). Mass balance considered all possible metabolic pathways using xylose as a substrate. Anaerobic degradation of ethanol was the most active pathway for hydrogen production in all experiments, except for the control. Each pre-treatment performed for the original inoculum resulted in different microbiological profiles, but the genus Clostridium was the most abundant in all assays. Acidic pre-treatment stimulated the growth of organisms from the genera Peptostreptococcaceae, Truepera and Kurthia, which could be related to the better results in hydrogen production found in this condition. (C) 2019 Elsevier Ltd. All rights reserved.

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