Journal
BIORESOURCE TECHNOLOGY
Volume 302, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.122785
Keywords
Rubber wood waste; Organosolv pretreatment; Hydrothermal pretreatment; Fermentable sugar; Methane
Funding
- Natural Rubber Innovation Research Institute, Prince of Songkla University (PSU), Thailand [RDO610285S]
- PSU Scientific Equipment Center and Faculty of Environmental Management, Prince of Songkla University
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Pretreatment is required for the enhancement of the bioconversion of lignocellulosic biomass. This study aimed to develop an integrated process producing efficient biochemical conversion of rubber wood waste (RW) into co-biofuels, fermentable sugar and methane. The glucan conversion was enhanced to 93.8% with temperature (210 degrees C) and delignification by organosolv pretreatment (OS). Thereafter, anaerobic digestion of the residue left after enzymatic hydrolysis was conducted which further improved the methane yield (205.5 LCH4/kg VS) by 33% over hydrothermal pretreatment (154.3 LCH4/kg VS). Delignification during OS plays a key role in improving the degradability of RW resulting in efficient energy recovery (11.23 MJ/kg pretreated RW) which was clearly higher than an integrated process based on hydrothermal (HT) or HT plus process water. Scaled up to a biorefinery, the integrated process based on OS would economically produce fermentable sugar while other value-added chemicals might be produced from the process water.
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