A combined fermentation and ethanol-assisted liquefaction process to produce biofuel from Nannochloropsis sp.
A combined fermentation and ethanol-assisted liquefaction process to produce biofuel from Nannochloropsis sp.
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DOI：
10.1016/j.fuel.2018.10.116
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发表时间：
2019-02
期刊：
影响因子：
7.4
通讯作者：
Quazi Mahzabin Rahman;Bo Zhang;Lijun Wang;Gail Joseph;A. Shahbazi
中科院分区：
文献类型：
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作者：
Quazi Mahzabin Rahman;Bo Zhang;Lijun Wang;Gail Joseph;A. Shahbazi
以海洋微藻Nannochloropsissp.为原料，研究了预处理、发酵和乙醇辅助液化相结合的工艺。首先用稀酸（3%H2SO4）预处理湿（约80%水分）和干微藻生物质，随后用酵母酿酒酵母（Saccharomyces cerevisiae）发酵。通过预处理和发酵，可产生液化所需的约10%的乙醇，发酵微藻生物质的脂肪含量提高了40%。在发酵之后，在265 °C下用15%（v/v）乙醇（2：1乙醇与藻类比率）辅助的液化将发酵的微藻转化为粗生物柴油、水性产物和固体残余物。与微藻液化相比，这种组合的藻液过程可以将粗生物柴油产量提高三倍。该工艺的主要优点是利用湿藻在工艺内生产必需乙醇，以提高乙醇辅助液化粗生物柴油的产量。
A combined pretreatment, fermentation and ethanol-assisted liquefaction process was studied to produce biofuels and chemicals from marine microalgaNannochloropsissp. Wet (∼80% moisture) and dry microalgal biomass were initially pretreated with dilute acid (3% H2SO4) and subsequently fermented with yeastSaccharomyces cerevisiae. By pretreatment and fermentation, about 10% of required ethanol in liquefaction was produced and the lipid content of fermented microalgal biomass was increased by 40%. Following fermentation, liquefaction assisted with 15% (v/v) ethanol (2:1 ethanol to algae ratio) at 265 °C converted fermented microalgae to crude biodiesel, aqueous products and solid residues. This combined algae to liquid process could increase the crude biodiesel yield by three-fold compared to liquefaction of microalgae. The main advantage of the process is the utilization of wet algae in essential ethanol production within the process to enhance the crude biodiesel production by ethanol-assisted liquefaction.