Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam 603110, Tamil Nadu, India.
Centre for Waste Management, International Research Centre, Sathyabama Institute of Science and Technology, Jeppiaar Nagar (OMR), Chennai 600119, Tamil Nadu, India.
Sci Total Environ. 2021 Jul 15;778:146262. doi: 10.1016/j.scitotenv.2021.146262. Epub 2021 Mar 8.
Environmental concerns due to fossil fuel usage has turned the research interest towards biomass and bioenergy field. Renewable biomass such as microalgae provides numerous advantages as they can grow in wastewater; sequester carbon dioxide, economical and eco-friendly. In this study, effect of pretreatment of microalgae (Scenedesmus obliquus) biomass using post-hydrothermal liquefaction wastewater (PHWW) for bio-oil production through hydrothermal liquefaction at a temperature of 300 °C was studied. Results showed liquefaction of pre-treated biomass yielded 48.53% bio-oil whereas 28.35% was resulted from biomass without pretreatment. The analysis of higher heating value of bio-oil showed that pretreated biomass oil has 36.19 MJ.Kg against non-pretreated biomass oil, which has 28.88 MJ.Kg. Bio-oil (pretreated biomass) analysis revealed that 60% of compounds are in diesel and gasoline range with 58.09% of energy recovery. Bio-oil was rich in hydrocarbons of C-C range with less oxygenated compounds. Carbon balance showed that an increase of 13% of carbon was sequestered in solid residue obtained from pretreated biomass and about 146% of increase also obtained in bio-oil.
由于化石燃料的使用而产生的环境问题，使得研究人员对生物质和生物能源领域产生了兴趣。可再生生物质，如微藻，具有许多优点，因为它们可以在废水中生长；固碳；经济且环保。在这项研究中，研究了用过热液化废水（PHWW）预处理微藻（斜生栅藻）生物质对 300°C 水热液化生产生物油的影响。结果表明，预处理生物质的液化产率为 48.53%，而未经预处理的生物质的产率为 28.35%。生物油高热值分析表明，预处理生物质油的热值为 36.19MJ.Kg，而非预处理生物质油的热值为 28.88MJ.Kg。生物油（预处理生物质）分析表明，60%的化合物处于柴油和汽油范围内，能量回收率为 58.09%。生物油富含碳碳化合物，含氧化合物较少。碳平衡表明，预处理生物质得到的固体残渣中固碳量增加了 13%，生物油的产量也增加了 146%。
