Orange Bagasse Pellets as a Carbon Source for Biobutanol Production
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Orange Bagasse Pellets as a Carbon Source for Biobutanol Production Gabriela Fiori da Silva1 · Samir Leite Mathias2 · Aparecido Junior de Menezes2 · João Guilherme Pereira Vicente3 · Tiago Palladino Delforno1 · Maria Bernadete Amâncio Varesche4 · Iolanda Cristina Silveira Duarte1 Received: 18 January 2020 / Accepted: 5 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Due to the environmental concerns, the conversion of lignocellulosic waste can be the key to produce bioproducts and biofuels such as butanol. This study aimed to present and evaluate orange bagasse pellets (OBP) as a carbon source to produce butan-1-ol production via ABE fermentation using Clostridium beijerinckii. These bagasse pellets were characterized, holocellulose (18.99%), alfacellulose (5.37%), hemicellulose (13.62%), lignin (6.16%), pectin (7.21%), protein (3.14%), and was tested under three different pretreatments, which were the following: (a) ultrasound, (b) autohydrolysis, and (c) acid-diluted hydrolysis followed by enzymatic hydrolysis to verify an amount of fermentable total reducing sugars. ANOVA was used and pretreatments followed by enzymatic hydrolysis do not enhance a significant amount of available sugars compared to raw bagasse. The ABE fermentation was carried out in batch reactors at 37 °C under agitation of 160 rpm and anaerobic conditions, using OBP without treatment followed by enzymatic hydrolysis. Using a non-mutant microorganism, the fermentation achieved butyric acid yields of 3762.68 mg L−1 for control and 2488.82 mg L−1 for OBP and the butanol production was 63.86 mg L−1 and 196.80 mg L−1 for OBP and the control (glucose) assay, respectively. The results of this solvent’s production have shown that OBP has the potential for ABE fermentation and a promising feedstock.
Statement of Novelty
Introduction
ABE fermentation uses Clostridium species and is a promising way to produce butanol. In this work, the OBP untreated were submitted to this fermentation with non-mutant strain. Chemical characterization was performed to find the valueadded application.
Lignocellulosic biomass as agro-industrial waste contains valuable compounds such as soluble sugars, structural carbohydrates (e.g., cellulose and hemicellulose), vitamins, and minerals. The complex carbohydrate molecules can be broken down by pretreatments into monomers and it can be converted into different biofuel types [1]. The orange (Citrus sinensis) is a citrus fruit as lemon, lime, grapefruit, and mandarin that are grown in more than 140 countries around the world [2]. However, the orange is the most widely cultivated fruit and represents more than half of the worldwide citrus processing industry [3]. Brazil is the largest orange fruit producer in the world and is the main exporter of processed citrus juice; of all orange juice produced in the world, around 80% are from Brazil which produced 13.7 millions of tons of orange in 2017 [4]. The residues generated after fruit processing are rich in soluble sugars, in additio
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