Comparative analysis of bio-oil quality from macroalgae via microwave and ultrasonic pretreatment subjected to hydrothermal liquefaction

IF 5.8 3区环境科学与生态学 0 ENVIRONMENTAL SCIENCES

Environmental Science and Pollution Research Pub Date : 2025-04-08 DOI:10.1007/s11356-025-36375-7

Ziba Borazjani, Farzad Bayat Mastalinezhad, Shahriar Osfouri, Reza Azin

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引用次数: 0

Abstract

Hydrothermal liquefaction (HTL) offers a sustainable method for producing bio-oil from algal biomass. Evaluating the microwave- and ultrasonic-pretreatment HTL and examining the quality of bio-oil obtained from HTL of marine macroalgae, namely Sargassum and Caulerpa, are the main objectives and novelty behind this work. Algal feedstocks were pretreated by microwave (500 W and 600 W) or ultrasonic (50 W and 75 W) before heating up to 350 oC for 35 min in the HTL reactor. Results showed that Sargassum and Caulerpa displayed completely different behaviors in pretreatment. The bio-oil yield from Sargassum went up by increasing microwave and ultrasonic pretreatment power. Although the microwave-assisted HTL of Caulerpa yielded more bio-oil than ultrasonication, it did not achieve the bio-oil production levels of the conventional HTL process. The highest yield and HHV of bio-oil were obtained for 22.4 wt% and 35.56 MJ/kg for Sargassum with microwave pretreatment, while the pretreatment power had a negative effect on those from Caulerpa by decreasing quantity and quality. It was also found that 56.41% of the bio-oil components were acids for Caulerpa, and 34.6% were ketones for Sargassum under conventional HTL. Thermal weight loss analysis showed that 70.4% of the bio-oil derived from Sargassum obtained by HTL following ultrasonic pretreatment possesses a boiling point below 243 °C which suggests the higher quality of the bio-oil derived from Sargassum with a significant proportion of lighter compounds. The results indicate that the bio-oil obtained from Sargassum had a higher quantity and quality than that for Caulerpa. Besides, the carbon recovery of bio-oil indicated the highest amount of carbon (70.12 wt%) was achieved through the microwave pretreatment of Sargassum. Also, differences in the cellular structure of the raw materials resulted in different quality and quantity of bio-oil.

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微波和超声波预处理水热液化大型藻类生物油品质的比较分析。

水热液化（HTL）为藻类生物质生产生物油提供了一种可持续的方法。评价微波和超声预处理马尾藻（马尾藻）和蕨藻（Caulerpa）生物油的质量是本研究的主要目的和创新点。采用微波（500 W和600 W）或超声波（50 W和75 W）对藻类原料进行预处理，然后在HTL反应器中加热至350℃，加热35 min。结果表明，马尾草和蕨草在预处理过程中表现出完全不同的行为。提高微波和超声波预处理功率可提高马尾藻生物油的收率。微波辅助蒸馏法虽然比超声蒸馏法产油量大，但仍达不到常规蒸馏法的产油水平。微波预处理马尾藻生物油的产率和HHV最高，分别为22.4% wt%和35.56 MJ/kg，而微波预处理功率对鸡冠藻生物油的产率和HHV有不利影响，使其数量和质量下降。在常规HTL条件下，茎藻的生物油成分中酸类成分占56.41%，马尾藻的生物油成分中酮类成分占34.6%。热失重分析表明，超声预处理后HTL法得到的马尾藻生物油的沸点在243℃以下的占70.4%，表明马尾藻生物油质量较高，且含有大量较轻的化合物。结果表明，从马尾藻中提取的生物油在数量和质量上均优于从蕨草中提取的生物油。此外，生物油的碳回收率表明，微波预处理马尾藻的碳回收率最高，为70.12 wt%。此外，原料细胞结构的差异也导致了生物油的质量和数量的不同。

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来源期刊

Environmental Science and Pollution Research 环境科学-环境科学

CiteScore

8.70

自引率

17.20%

发文量

6549

审稿时长

3.8 months

期刊介绍： Environmental Science and Pollution Research (ESPR) serves the international community in all areas of Environmental Science and related subjects with emphasis on chemical compounds. This includes: - Terrestrial Biology and Ecology - Aquatic Biology and Ecology - Atmospheric Chemistry - Environmental Microbiology/Biobased Energy Sources - Phytoremediation and Ecosystem Restoration - Environmental Analyses and Monitoring - Assessment of Risks and Interactions of Pollutants in the Environment - Conservation Biology and Sustainable Agriculture - Impact of Chemicals/Pollutants on Human and Animal Health It reports from a broad interdisciplinary outlook.