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Abstract
The combined effects of three key ozonation process parameters on the integrated ozonation-enzymatic hydrolysis pretreatment of sugarcane bagasse (SCB) were investigated, with emphasis on the relationship between sugar release and ozone consumption. A lab-scale fixed bed reactor was employed for ozonation at varying ozone doses (50, 75 and 100 mg O3/g SCB), particle sizes (420, 710 and 1000 µm) and moisture contents (30, 45 and 60% w/w) in multifactorial experiments, keeping a residence time of 30 min. The ozonated SCB showed a reduction in the content of acid-insoluble lignin from 26.6 down to 19.1% w/w, while those of cellulose and hemicellulose were retained above 45.5 and 13.6% w/w, with recoveries of 100–89.9 and 83.5–72.7%, respectively. Ozone-assisted enzymatic hydrolysis allowed attaining glucose and xylose yields as high as 45.0 and 37.8%, respectively. The sugars released/ozone expended ratio ranged between 2.3 and 5.7 g sugars/g O3, being the higher value achieved with an applied ozone input of 50 mg O3/g SCB and SCB with 420 µm particle size and 60% moisture. Such operating conditions led to efficient ozone utilization (<2% unreacted ozone) with a yield of 0.29 g sugars/g SCB. Overall, the amount of sugars released relative to the ozone consumed was improved, entailing an estimated cost of ozonation of USD 34.7/ton of SCB, which could enhance the profitability of the process.
Highlights
Nowadays, lignocellulosic biomass constitutes one of the most abundant and renewable resources to fuel biotech processes devoted to producing a portfolio of numerous target high added-value bio-products, such as ethanol, biogas, hydrogen, polymers and carboxylic acids, to give a few examples [1]
This study aimed to investigate the combined effects of particle size, moisture content and ozone dose on the ozonation and subsequent enzymatic hydrolysis of sugarcane bagasse (SCB), with an emphasis on determining possible structural and morphological changes and their relationship with the amounts of sugars released and ozone consumed
SCB was composed, on dry weight basis (% w/w), of cellulose 50.59 ± 0.68%, hemicellulose 18.71 ± 0.99%, acid-soluble lignin (ASL) 3.07 ± 0.22% and acid-insoluble lignin (AIL) 26.60 ± 1.01%. This structural composition, corresponding to the average and standard deviation values of the three different particle sizes tested, is similar to those reported by previous studies characterizing the chemical composition of SCB, with values of 35.2−49.5% for cellulose, 15.84−31.85% for hemicellulose, 3.13−4.46% for ASL and
Summary
Lignocellulosic biomass constitutes one of the most abundant and renewable resources to fuel biotech processes devoted to producing a portfolio of numerous target high added-value bio-products, such as ethanol, biogas, hydrogen, polymers and carboxylic acids, to give a few examples [1]. Sugarcane bagasse (SCB), the major by-product derived from the sugarcane industry, has been studied extensively as it possesses high potential as a feedstock for biorefineries. The worldwide production of sugarcane was reported to be about 2.015 billion tons in 2018 [2]. 450 kg of dry SCB are generated from each ton of sugarcane, being currently burned in combined heat and power systems [3]. There exists, a surplus of sugarcane lignocellulosic biomass that can be utilized for biorefining purposes. The efficient release of fermentable sugars by enzymatic hydrolysis requires that SCB is pretreated to tackle its complex and recalcitrant nature
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