Valorization of green coconut fibre: use of the black liquor of organolsolv pretreatment for ethanol production and the washing water for production of rhamnolipids by pseudomonas aeruginosa ATCC 27583

• Autor(a) principal: Souza, Domingos Fabiano de Santana
• Data de Publicação: 2019
• Outros Autores: Padilha, Carlos Eduardo de Araújo, Nogueira, Cleitiane da Costa, Oliveira, Jackson Araújo de, Santos, Everaldo Silvino dos
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/45163
• topic: Biomass; Enzymatic hydrolysis; Liquor recycling; Reuse; Biosurfactant; Lignin

The present study proposes the production of ethanol, lignin and rhamnolipids from the valorization scheme of green coconut fibre (GCF) and glycerol. As expected, all pretreatments using 80% (w/w) glycerol and 1% (w/w) sulfuric acid promoted high delignification (> 60%) and good cellulose enrichment (> 50% w/w). The reuse of black liquor in the pretreatments apparently did not affect the glucose release (48.36–49.96 g/L) or the fermentability (22.62–29.64 g/L) of pretreated GCF at 20% (w/v) solid loading. Structural differences between recovered lignin from glycerol-based organosolv pretreatment and alkaline lignin were observed after spectroscopy and thermal stability analyses. In addition, the lignin precipitation water and washing water from the glycerol-based pretreatments of GCF were used in culture media preparation for Pseudomonas aeruginosa ATCC 27583. The production of rhamnolipids varied in the range of 0.57–1.25 g/L and presented greater emulsifying capacity than the rhamnolipids obtained from pure glycerol. Therefore, the methodology described in this study provides an unusual method for obtaining value-added products from organosolv pretreatment of lignocellulosic biomasses