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Integrated Ozonation-Enzymatic Hydrolysis Pretreatment of Sugarcane Bagasse: Enhancement of Sugars Released to Expended Ozone Ratio
Processes ( IF 3.5 ) Pub Date : 2020-10-11 , DOI: 10.3390/pr8101274
Daryl Rafael Osuna-Laveaga , Octavio García-Depraect , Ramiro Vallejo-Rodríguez , Alberto López-López , Elizabeth León-Becerril

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.

中文翻译:

一体化甘蔗渣的臭氧化-酶水解预处理:提高糖的释放以达到消耗的臭氧比

研究了三个关键的臭氧化工艺参数对甘蔗渣综合臭氧化-酶促水解预处理(SCB)的综合影响,重点是糖释放与臭氧消耗之间的关系。使用实验室规模的固定床反应器,以不同的臭氧剂量(50、75和100 mg O 3 / g SCB),粒径(420、710和1000 µm)和水分含量(30、45和60%w)进行臭氧化/ w)在多因素实验中,保持30分钟的停留时间。臭氧化的SCB显示酸不溶性木质素含量从26.6降低到19.1%w / w,而纤维素和半纤维素的木质素含量保持在45.5和13.6%w / w以上,回收率分别为100–89.9和83.5–72.7%。臭氧辅助的酶促水解使得葡萄糖和木糖的产率分别高达45.0和37.8%。释放的糖/臭氧消耗比在2.3至5.7 g糖/ g O 3之间,这是施加的臭氧输入量为50 mg O 3 / g SCB和SCB和420 µm粒径和60%水分的SCB所获得的更高值。这样的操作条件导致有效的臭氧利用(未反应的臭氧<2%),每克SCB的糖产量为0.29克。总体而言,相对于消耗的臭氧,糖的释放量得到了改善,臭氧处理的成本估计为每吨SCB 34.7美元,这可以提高该工艺的盈利能力。
更新日期:2020-10-11
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