کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
243228 | 501923 | 2012 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Growing wastewater-born microalga Auxenochlorella protothecoides UMN280 on concentrated municipal wastewater for simultaneous nutrient removal and energy feedstock production Growing wastewater-born microalga Auxenochlorella protothecoides UMN280 on concentrated municipal wastewater for simultaneous nutrient removal and energy feedstock production](/preview/png/243228.png)
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−1), high biomass productivity (269 mg L−1 d−1) and high lipid productivity (78 mg L−1 d−1). 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−1 d−1 of dried algae.
► Integrating algae-based biodiesel production with wastewater treatment.
► One wastewater-born microalga Auxenochlorella protothecoides is isolated.
► The high nutrient removal efficiencies of TN, TP, and COD are achieved.
► High growth rate (0.492 d−1) and lipid productivity (77.7 mg L−1 d−1) are obtained.
► The system could be operated at a 1/3 daily replacement rate with productivity of 1.51 g L−1 d−1.
Journal: Applied Energy - Volume 98, October 2012, Pages 433–440