Enhanced substrate suitability of autoclave-assisted acid pre-treated waste sugarcane molasses: Pre-treatment optimization, sequential nano-based detoxification strategies, and bioproduct production

IF 3.5 4区工程技术 Q3 ENERGY & FUELS

Biomass Conversion and Biorefinery Pub Date : 2024-09-27 DOI:10.1007/s13399-024-06127-7

Bryce D. C. Bishop, Isaac A. Sanusi, Gueguim E. B. Kana

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Abstract

This study modelled and optimised an autoclave-assisted acid pre-treatment of waste sugarcane molasses for the recovery of reducing sugar. Afterwards, the efficiency of removing 5-hydroxymethylfurfural (5-HMF), furfural, and metallic ion inhibitors from the pre-treated hydrolysate was evaluated using a nano-based adsorbent towards bioproduct production. A high coefficient of determination (R² = 0.98) and a maximum reducing sugar concentration of 98.14 g/L were achieved under optimised conditions of 20% (w/v) substrate loading, 0.75% (v/v) sulphuric acid concentration, and 5 min autoclave duration. Furthermore, the application of nano-adsorbent (Fe₃O₄ nanoparticle (0.2% (w/v)) led to a reduction in 5-HMF and furfural concentrations by 29.05% and 53.53%, respectively. Additionally, the concentrations of metal ion contents (Ca, Mg, Na, and S) were reduced by 4.97%, 7.59%, 15.04%, and 7.63%, respectively. Remarkably, surface modification of Fe₃O₄ nanoparticle using poly (ethylene glycol) (PEG), tri sodium citrate (TSC), chitosan-coated and k-carrageenan (k-C) enhanced the removal of metal ion contents up to 42.74-fold. The potential of the optimised pre-treated and detoxified molasses for citric acid (4.04 g/L) and bioethanol production (47.93 g/L) was achieved. The high efficiencies in reducing sugar recovery, inhibitor removal, and bioproduct production demonstrate the potential of a sustainable, cost-effective, and eco-friendly molasses biorefinery concept.

Graphical Abstract

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高压灭菌辅助酸预处理废甘蔗糖蜜的增强底物适用性：预处理优化、顺序纳米解毒策略和生物制品生产

本研究模拟并优化了高压灭菌辅助酸预处理废甘蔗糖蜜以回收还原糖的方法。随后，利用纳米吸附剂对预处理水解液中去除5-羟甲基糠醛（5-HMF）、糠醛和金属离子抑制剂的效率进行了评估。在底物负荷为20% （w/v）、硫酸浓度为0.75% （v/v）、蒸压时间为5 min的优化条件下，获得了较高的测定系数（R2 = 0.98）和最大还原糖浓度为98.14 g/L。此外，纳米吸附剂(Fe3O4纳米颗粒（0.2% (w/v)）的应用使5-HMF和糠醛浓度分别降低了29.05%和53.53%。金属离子（Ca、Mg、Na和S）含量分别降低了4.97%、7.59%、15.04%和7.63%。采用聚乙二醇（PEG）、柠檬酸三钠（TSC）、壳聚糖包被和k-卡拉胶（k-C）对Fe3O4纳米粒子进行表面改性，对金属离子的去除率提高了42.74倍。优化后的预处理解毒糖蜜具有生产柠檬酸（4.04 g/L）和生物乙醇（47.93 g/L）的潜力。在还原糖回收、抑制剂去除和生物产品生产方面的高效率表明了可持续、经济、环保的糖蜜生物炼制概念的潜力。图形抽象

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来源期刊

Biomass Conversion and Biorefinery Energy-Renewable Energy, Sustainability and the Environment

CiteScore

7.00

自引率

15.00%

发文量

1358

期刊介绍： Biomass Conversion and Biorefinery presents articles and information on research, development and applications in thermo-chemical conversion; physico-chemical conversion and bio-chemical conversion, including all necessary steps for the provision and preparation of the biomass as well as all possible downstream processing steps for the environmentally sound and economically viable provision of energy and chemical products.