Growing wastewater-born microalga Auxenochlorella protothecoides UMN280 on concentrated municipal wastewater for simultaneous nutrient removal and energy feedstock production

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• 作者：Wenguang Zhou ; Yecong Li ; Min Min ; Bing Hu ; Hong Zhang ; Xiaochen Ma ; Liang Li ; Yanling Cheng ; Paul Chen ; Roger Ruan ; ^{ruanx001@umn.edu}
• 关键词：Auxenochlorella protothecoides UMN280 ; Biofuel feedstock production ; Municipal wastewater ; Nutrient removal ; Semi-continuous cultivation
• 刊名：Applied Energy
• 出版年：2012
• 期刊代码：2_03062619
• 类别：pw
• 出版时间：October, 2012
• 卷：98
• 期：Complete
• 页码：433-440
• 文件大小：828 K

摘要

Using wastewater to grow algae is probably the most promising route to reduce production costs associated with nutrients and water. In this study, a newly isolated facultative heterotrophic freshwater microalgae strain, Auxenochlorella protothecoides UMN280, was examined for algal growth, wastewater nutrient removal efficiency, and lipid accumulation in batch and semi-continuous cultivation with various hydraulic retention time using concentrated municipal wastewater (CMW) as cultivation media. The results of the 6 day batch cultivation showed that the maximal removal efficiencies for total nitrogen, total phosphorus, chemical oxygen demand (COD) and total organic carbon (TOC) were over 59%, 81%, 88%and 96%, respectively, with high growth rate (0.490 d^鈭?), high biomass productivity (269 mg L^鈭? d^鈭?) and high lipid productivity (78 mg L^鈭? d^鈭?). Further fatty acid methyl ester (FAME) analysis showed that the microalgal lipids were mainly composed of C16/C18 fatty acids (accounting for over 94%of total fatty acid), which are suitable for high-quality biodiesel production. The system could be scaled up from 100 mL flasks to 25 L BIOCOIL reactors, and semi-continuously operated at hydraulic retention time of 3 days with a net biomass productivity of 1.51 g L^鈭? d^鈭? of dried algae.