resumo
The aim of this manuscript was the study of the recovery of bioethanol produced by the fermentation of the lignocellulosic biomass (olive bagasse) by nanofiltration. In terms of downstream processing, the nanofiltration permeate stream was expected to be comprised mostly of water and ethanol, and as such, ethanol may be further recovered by conventional distillation. Different nanofiltration membranes (NF90 and NF270) were tested for their efficiency in the separation of bioethanol. Model aqueous solutions of ethanol and sugars, and real liquors were processed by nanofiltration focusing on flux and rejection performance. The results shown that the more complex medium of a real liquor interacts with the membrane and lower the rejection to target solutes. Generally, both membranes tested were suitable for separating and recovering ethanol from a fermentation medium. The diafiltration mathematical model developed in this work shown to be capable of describing experimental results, which may be considered extremely important for process design and scaling up purposes.
palavras-chave
WHEAT-STRAW; LIGNOCELLULOSIC BIOMASS; ENZYMATIC-HYDROLYSIS; BIOREFINERY CONCEPT; ETHANOL-PRODUCTION; SUGARCANE BAGASSE; BIOGAS PRODUCTION; MILL WASTE; PORE-SIZE; MEMBRANE
categoria
Engineering; Water Resources
autores
Bras, T; Fernandes, MC; Santos, JLC; Neves, LA
nossos autores
Maria da Conceição Fernandes
Bolseiro de pós-Doutoramento
Teresa Brás
Bolseiro de investigaçãoGrupos
agradecimentos
The authors want to thank to COMPETE (Competitity Factors Operation Program), QREN (National Strategy Reference, Portugal 2007-2013), ADI (Agency of Innovation) and Regional Development European Foundation for their financial support to Refinolea Project (FCOMP-01-0202-FEDER-005450). This work was partially supported by FCT research grants from Luisa Neves SFRH/BPD/64975/2009, as well as fellowship from Refinolea Project to Teresa Bra's (CBL/Refinolea/BI01/2010). The CICECO, an Associated Laboratory from Portuguese Ministry of Science is financed by Pest-C/CTM/LA0011/2011. Luisa Neves would like to acknowledge the financial support of Fundacao para a Ciencia e a Tecnologia through grant no. PEst-C/EQB/LA0006/2011.