Journal
APPLIED ENERGY
Volume 98, Issue -, Pages 433-440Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2012.04.005
Keywords
Auxenochlorella protothecoides UMN280; Biofuel feedstock production; Municipal wastewater; Nutrient removal; Semi-continuous cultivation
Categories
Funding
- University of Minnesota Initiative for Renewable Energy
- Environment (IREE), Metropolitan Council Environmental Services (MCES), Xcel Energy
- Legislative-Citizen Commission on Minnesota Resources (LCCMR)
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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. (c) 2012 Elsevier Ltd. All rights reserved.
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