Exploring the biorefinery potential of sweet potato crop residues through torrefaction and pyrolysis: Processing of leaves, stems, and peel

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING Biomass & Bioenergy Pub Date : 2024-06-29 DOI:10.1016/j.biombioe.2024.107293

Débora Gonçalves Carvalho, Júlia Nicolao Piacentini, Luciane Ferreira Trierweiler, Jorge Otávio Trierweiler

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Abstract

The utilization of neglected agro-industrial waste is essential for mitigating environmental impacts. This study aims to characterize the products of using sweet potato peels, leaves and stems via pyrolysis and torrefaction techniques. Additionally, the study examined the impact of the torrefaction pre-treatment on pyrolysis products. Solid, liquid, and gaseous products were characterized. Results indicated that torrefaction pre-treatment increased biochar yield but diminished bio-oil and gas yields. Thermal treatments had minimal impact on the specific surface area of formed solids and biochars. Bio-oils showed a proclivity towards basicity with increasing temperature. Phenols predominated in the organic fraction of bio-oils, with torrefaction pre-treatment resulting in reduced alcohol and increased hydrocarbon concentration. Gas composition revealed elevated CO₂ levels during torrefaction, while torrefaction pre-treatment amplified CH₄ concentration. These findings suggest potential for extracting chemical inputs like phenolic resins and biocides from sweet potato waste bio-oils, though further treatments are required for effective solid adsorption.

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通过焙烧和热解探索甘薯作物残渣的生物精炼潜力：叶、茎和皮的加工

利用被忽视的农用工业废物对减轻环境影响至关重要。本研究旨在通过热解和焙烧技术分析利用甘薯皮、叶和茎的产品特征。此外，该研究还考察了热解预处理对热解产品的影响。对固体、液体和气体产品进行了表征。结果表明，预处理提高了生物炭的产量，但降低了生物油和气体的产量。热处理对形成的固体和生物炭的比表面积影响很小。随着温度的升高，生物油显示出碱性倾向。生物油的有机部分以酚类为主，预处理导致酒精含量降低，碳氢化合物浓度升高。气体成分显示，在热解过程中二氧化碳浓度升高，而热解预处理则使甲烷浓度升高。这些研究结果表明，从甘薯废生物油中提取酚醛树脂和生物杀灭剂等化学物质具有潜力，但需要进一步处理才能实现有效的固体吸附。

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来源期刊

Biomass & Bioenergy 工程技术-能源与燃料

CiteScore

11.50

自引率

3.30%

发文量

258

审稿时长

60 days

期刊介绍： Biomass & Bioenergy is an international journal publishing original research papers and short communications, review articles and case studies on biological resources, chemical and biological processes, and biomass products for new renewable sources of energy and materials. The scope of the journal extends to the environmental, management and economic aspects of biomass and bioenergy. Key areas covered by the journal: • Biomass: sources, energy crop production processes, genetic improvements, composition. Please note that research on these biomass subjects must be linked directly to bioenergy generation. • Biological Residues: residues/rests from agricultural production, forestry and plantations (palm, sugar etc), processing industries, and municipal sources (MSW). Papers on the use of biomass residues through innovative processes/technological novelty and/or consideration of feedstock/system sustainability (or unsustainability) are welcomed. However waste treatment processes and pollution control or mitigation which are only tangentially related to bioenergy are not in the scope of the journal, as they are more suited to publications in the environmental arena. Papers that describe conventional waste streams (ie well described in existing literature) that do not empirically address ''new'' added value from the process are not suitable for submission to the journal. • Bioenergy Processes: fermentations, thermochemical conversions, liquid and gaseous fuels, and petrochemical substitutes • Bioenergy Utilization: direct combustion, gasification, electricity production, chemical processes, and by-product remediation • Biomass and the Environment: carbon cycle, the net energy efficiency of bioenergy systems, assessment of sustainability, and biodiversity issues.