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首页> 外文期刊>Bioenergy research >Mixed Trophic State Production Process for Microalgal Biomass with High Lipid Content for Generating Biodiesel and Biogas
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Mixed Trophic State Production Process for Microalgal Biomass with High Lipid Content for Generating Biodiesel and Biogas

机译：高脂类微藻生物质的混合营养状态生产工艺，用于产生生物柴油和沼气

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Economically feasible and sustainable energy production from microalgae requires optimization of algal growth, maximization of lipid content, and enhancement of biomass conversion into energy. An innovative, mixed trophic state process with high productivity was implemented to generate microalgae with high lipid content for generating biodiesel and biogas. Auxenochlorella protothecoides, a unicellular green alga, was grown phototrophically to 0.28 dry weight per L (gdw/L) then concentrated to 36 gdw/L for use as an inoculum for a subsequent heterotrophic cultivation to a final density of nearly 120 gdw/L. Simultaneous nitrogen deprivation and glucose supplementation during the heterotrophic stage increased the total lipid content from 16 to 57 % while the triacylglycerol (TAG) fraction of total lipids advanced from 2 to 79 %. Productivity peaked at 4.9 g of biomass/L-h and 1.7 g TAGs/L-h. The extracted lipids, including high levels of oleic, linoleic, and palmitic acids, were converted into biodiesel with a predicted cetane number of 56.4 and low concentrations of long-chain saturated and polyunsaturated fatty acid methyl esters. Both intact microalgal biomass and lipid-extracted algal residues (LEA) were good substrates for anaerobic digestion (AD) with methane yields of 0.6 and 0.4 L/g volatile solids (VS), respectively. These yields represented nearly 80 % of theoretical methane potential. LEA, with a favorable carbon to nitrogen ratio (C:N) of approximately 19:1, is an appropriate substrate for anaerobic microorganisms, most likely because it contains essential nutrients required for microbial digestion. The biochemical composition of the biomass, especially its lipid content, is the major contributor for energy output. As a result, coupling biodiesel production with AD of LEA to generate methane can increase the overall process’ energy output up to 40 %.
机译：从微藻类在经济上可行且可持续的能源生产需要优化藻类生长，最大程度地增加脂质含量以及提高将生物质转化为能源的能力。实施了一种创新的高营养混合营养状态工艺，以生产具有高脂质含量的微藻，以生产生物柴油和沼气。原生态小球藻绿藻（Auxenochlorella protothecoides）是一种单细胞绿藻，光养生长至每升0.28干重（gdw / L），然后浓缩至36 gdw / L，用作接种物，用于随后的异养培养，最终密度接近120 gdw / L。在异养阶段同时进行氮剥夺和葡萄糖补充，使总脂质含量从16％增加到57％，而总脂质中的三酰基甘油（TAG）分数从2％提高到79％。生产率在4.9 g生物量/ L-h和1.7 g TAGs / L-h达到峰值。提取的脂质（包括高含量的油酸，亚油酸和棕榈酸）被转化为生物柴油，其十六烷值预计为56.4，低浓度的长链饱和和多不饱和脂肪酸甲酯。完整的微藻生物量和脂质提取的藻类残留物（LEA）都是厌氧消化（AD）的良好基质，甲烷的甲烷产量分别为0.6和0.4L / g挥发性固体（VS）。这些收率约占理论甲烷潜力的80％。 LEA的碳氮比（C：N）约为19：1，是厌氧微生物的合适底物，最有可能是因为它含有微生物消化所需的必需营养素。生物质的生物化学组成，尤其是其脂质含量，是能量输出的主要贡献者。结果，将生物柴油生产与LEA的AD结合产生甲烷可以将整个过程的能量输出提高多达40％。

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