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首页> 外文期刊>Bioprocess and Biosystems Engineering >Optimization of aeration for biodiesel production by Scenedesmus obliquus grown in municipal wastewater
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Optimization of aeration for biodiesel production by Scenedesmus obliquus grown in municipal wastewater

机译：城市污水中斜生藻生物柴油生产曝气的优化

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摘要

Despite the significant breakthroughs in research on microalgae as a feedstock for biodiesel, its production cost is still much higher than that of fossil diesel. One possible solution to overcome this problem is to optimize algal growth and lipid production in wastewater. The present study examines the optimization of pretreatment of municipal wastewater and aeration conditions in order to enhance the lipid productivity of Scenedesmus obliquus. Results showed that no significant differences were recorded in lipid productivity of S. obliquus grown in primary settled or sterilized municipal wastewater; however, ultrasound pretreatment of wastewater significantly decreased the lipid production. Whereas, aeration rates of 0.2 vvm significantly increased lipid content by 51 %, with respect to the non-aerated culture, which resulted in maximum lipid productivity (32.5 mg L-1 day(-1)). Furthermore, aeration enrichment by 2 % CO2 resulted in increase of lipid productivity by 46 % over the CO2 non-enriched aerated culture. Fatty acid profile showed that optimized aeration significantly enhanced monounsaturated fatty acid production, composed mainly of C18:1, by 1.8 times over the non-aerated S. obliquus culture with insignificant changes in polyunsaturated fatty acid proportion; suggesting better biodiesel characteristics for the optimized culture.
机译：尽管在微藻作为生物柴油原料的研究方面取得了重大突破，但其生产成本仍远高于化石柴油。解决此问题的一种可能的解决方案是优化废水中的藻类生长和脂质生产。本研究探讨了市政废水预处理和曝气条件的优化，以提高斜生鹿角藻的脂质生产率。结果表明，在原定居或消毒的城市污水中，斜生链球菌的脂类生产力没有显着差异。然而，废水的超声预处理显着降低了脂质的产生。相对于未充气的培养物，0.2 vvm的充气率显着增加了51％的脂质含量，从而实现了最大的脂质生产率（32.5 mg L-1天（-1））。此外，与未富含CO2的曝气培养相比，富含2％CO2的曝气导致脂质生产率提高46％。脂肪酸谱显示，优化的通气比未充气的斜生链霉菌显着提高了主要由C18：1组成的单不饱和脂肪酸的产量，而多不饱和脂肪酸的比例变化不大；说明优化培养具有更好的生物柴油特性。

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