Synergistic enhancement of biomethane production through anaerobic co-digestion of sugarcane bagasse and napier grass: Effects of substrate ratio, inoculum loading, and kinetic behaviour

IF 7 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy Pub Date : 2026-08-01 Epub Date: 2026-02-27 DOI:10.1016/j.biombioe.2026.109187

Nidhi Chhabra Talreja , Jaydeep Pandit , Ajay S. Kalamdhad

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引用次数: 0

Abstract

The effective valorization of agro-industrial residues is pivotal to advancing the bio-based industry, ensuring sustainable energy resilience and waste management in India. Sugarcane bagasse (BG), a fibrous by-product of the sugar industry, remains largely underutilized despite its abundance and carbon-rich composition. This study investigates the synergistic co-digestion of BG with napier grass (NG), a fast-growing perennial energy crop, to enhance biomethane production and establish a sustainable waste-to-energy pathway. Batch biochemical methane potential (BMP) assays were conducted to optimize the feed-mixing ratio (FMR) and substrate-to-inoculum (S/I) ratio, while kinetic modelling using the Pseudo-first-order and Modified gompertz models elucidated degradation behaviour and methane generation dynamics. The optimal combination of 40:60 (BG:NG) at an S/I ratio of 0.5 achieved the highest methane yield of 203.5 mL CH₄ g⁻¹ VS_added, accompanied by the maximum co-digestion performance index (CPI), indicating strong synergistic effects. Co-digestion improved hydrolysis efficiency, degradation kinetics, and overall methane productivity compared to monodigestion. The results of this study highlight the potential of using BG and NG for biomethane production which serves as a strategy for transforming sugar-industry waste into renewable energy.

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通过厌氧共消化蔗渣和甘油三草协同增强生物甲烷生产：底物比例、接种量负荷和动力学行为的影响

农业工业残留物的有效增值对于推进生物基工业，确保印度的可持续能源弹性和废物管理至关重要。甘蔗渣（BG）是制糖工业的纤维副产品，尽管其丰富且富含碳，但在很大程度上仍未得到充分利用。本研究探讨了沼液与长生多年生能源作物甘油三酯（NG）的协同消化，以提高生物甲烷的产量，并建立可持续的废物转化能源途径。利用间歇生化甲烷势（BMP）测定优化进料混合比（FMR）和底物与接种物（S/I）比，同时利用伪一阶和修正gompertz模型建立动力学模型，阐明降解行为和甲烷生成动力学。以40:60 （BG:NG）、S/I比为0.5为最佳组合，甲烷产率最高，为203.5 mL CH4 g−1 VSadded，共消化性能指数（CPI）最高，显示出较强的协同效应。与单消化相比，共消化提高了水解效率、降解动力学和总甲烷产量。这项研究的结果强调了使用BG和NG生产生物甲烷的潜力，这是将制糖工业废物转化为可再生能源的一种策略。

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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.