Maximizing energy recovery from food waste through integrated microalgae harvest using lipid-rich particles followed by anaerobic digestion of biomass residues

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING Biomass & Bioenergy Pub Date : 2025-06-01 Epub Date: 2025-04-02 DOI:10.1016/j.biombioe.2025.107850

Adel W. Almutairi

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Abstract

The present study evaluated the potential of algae-based integrated food waste biorefinery to produce valuable bio-based compounds. Lipid-rich particles (FW-LRP) were applied for microalgae harvest, followed by using the solid fraction of food waste (FW-S) for biogas production. The FW-LRP showed 57.2 % higher lipid content with 73.3 % higher polyunsaturated fatty acid compared to food waste mixture. When used for microalgae harvest, FW-LRP demonstrated 92.7 % harvest efficiency with improved biodiesel quality. The highest biodiesel yield of microalgae harvested by FW-LRP was 21.28 g L⁻¹, showing higher cetane number of 57.49 and lower iodine value of 72.8 g I₂ per 100 g oil. Furthermore, co-digestion of microalgal lipid-free residues with FW-S yielded biogas of 407.3 L kg⁻¹ VS (with 70.9 % biomethane proportion). These findings confirm the high potential of food waste valorization in microalgae industry to improve biodiesel characteristics and boost anaerobic digestion processes, presenting a promising outlook for sustainable food waste management strategies.

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通过利用富含脂质的颗粒整合微藻收获，然后对生物质残渣进行厌氧消化，最大限度地从食物垃圾中回收能量

本研究评估了以藻类为基础的食物垃圾综合生物精炼生产有价值的生物基化合物的潜力。富脂颗粒（FW-LRP）用于微藻收获，然后利用食物垃圾的固体部分（FW-S）生产沼气。与食物垃圾混合物相比，FW-LRP的脂肪含量高57.2%，多不饱和脂肪酸含量高73.3%。当用于微藻收获时，FW-LRP的收获效率为92.7%，生物柴油质量得到改善。FW-LRP收获的微藻生物柴油产量最高，为21.28 g L−1，十六烷值较高，为57.49，碘值较低，为72.8 g I2 / 100 g油。此外，微藻无脂残留物与FW-S共消化产生的沼气为407.3 L kg−1 VS（生物甲烷比例为70.9%）。这些研究结果证实了微藻产业在改善生物柴油特性和促进厌氧消化过程方面的巨大潜力，为可持续的食物垃圾管理策略提供了广阔的前景。

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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.