Author:
Lobo Gomes Carla,Bárbara de Almeida Jozianny,De Souza Rodrigues Dasciana,Galeano Suarez Carlos Alberto,Cavalcanti Montano Inti Doraci
Abstract
Alkaline pretreatment is one of the most effective processes in lignin removal for different types of lignocellulosic materials. However, the generation of a large amount of black liquor with a high excess of hydroxyl ions (OH-), in addition to the wastewater generated in the biomass washing steps, are some of the main problems with using this type of pretreatment. This work aims to show, through a case study, the water consumption required to carry out this type of pretreatment. Brewer's spent grain (BSG) was used as lignocellulosic material to carry out alkaline pretreatment with 4% NaOH and to quantify the water used in the process. A global mass balance during the BSG delignification process allowed identifying a global recovery percentage of 87.92% of cellulose, 84.56% of hemicellulose and 87.63% of lignin of the total material fed into the delignification process. For quantifying the main components present in the studied BSG, it was necessary to characterize the washing water of the solids obtained in the pretreatment. At the end of the process, approximately 0.50 g of cellulose, 0.71 g of hemicellulose and 0.97 g of lignin were lost in relation to the grams fed, initially in the delignification process. The water demand during the process was 131, 2 mL per g of dry material.
Publisher
Fundacao Oswaldo Aranha - FOA
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