Evaluation of bioethanol and biodiesel production from Scenedesmus obliquus grown in biodiesel waste glycerol: A sequential integrated route for enhanced energy recovery
文献类型： 外文期刊
作者： Xu, Shannan 1 ; Elsayed, Mandy 2 ; Ismail, Gehan A. 3 ; Li, Chunhou 1 ; Wang, Shuang 4 ; Abomohra, Abd El-Fatah 3 ;
作者机构： 1.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Key Lab South China Sea Fishery Resources Exploit, Minist Agr & Rural Affairs, Guangzhou 510300, Guangdong, Peoples R China
2.Cairo Univ, Dept Agr Engn, Fac Agr, Giza 12613, Egypt
3.Tanta Univ, Bot Dept, Fac Sci, Tanta 31527, Egypt
4.Jiangsu Univ, New Energy Dept, Sch Energy & Power Engn, Nanjing 212013, Jiangsu, Peoples R China
5.Huazhong Agr Univ, Coll Engn, Wuhan 430070, Hubei, Peoples R China
关键词： Microalgae; Biofuel; Biorefinery; Fermentation; Transesterification
期刊名称：ENERGY CONVERSION AND MANAGEMENT （ 影响因子：9.709； 五年影响因子：8.954 ）
ISSN： 0196-8904
年卷期： 2019 年 197 卷
页码：
收录情况： SCI
摘要： The present study aimed to evaluate the energy recovery through biodiesel and bioethanol production from Scenedesmus obliquus in a sequential route of lipid extraction followed by fermentation, with recycling of waste glycerol (WG) as a nutrient supplement into the culture. Low WG concentrations significantly enhanced the cellular dry weight over the control, recording the maximum significant value of 3.63 g L-1 using 2.5 g L-1 of WG (WG2.5). In addition, the maximum carbohydrate and lipid contents were recorded in WG2.5, which represented 16.4% and 21.7%, respectively, over the corresponding control, with simultaneous reduction in protein content. Moreover, total fatty acid methyl esters (FAMEs) recovery from biomass increased after WG2.5 supplementation, recording an increase of 24.6% over the control. Fermentation of lipid-free biomass increased the rate of bioethanol production, reaching its peak of 4.82 g L-1 at the 27th day. However, using of WG2.5 for microalgal growth and the residual lipid-free biomass for fermentation showed the highest bioethanol production peak of 5.58 g L-1 at day 27. Due to the accumulation of carbohydrates under WG, the biomass treated with WG2.5 showed increase in maximum bioethanol productivity up to 0.185 g L(-1)h(-1). However, sequential fermentation after lipid extraction enhanced the maximum bioethanol productivity by 32.3% and 15.1% over the whole cells from synthetic wastewater (WW) and lipid-free biomass from WW, respectively. The highest gross energy output of 21.4 GJ ton(-1) dry microalgae was estimated from the integrated route where S. obliquus was grown in WG-enriched medium and sequential fermentation was applied for the residual biomass after lipid extraction, with the highest recorded energy conversion efficiency of 62.9%. These findings provide an innovative practical integrated approach for waste recycling and high conversion efficiency of microalgal biomass for liquid biofuel production.
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