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Investigation of Microalgae Co-Cultures for Nutrient Recovery and Algal BiomassProduction from Dairy Manure
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Applied Engineering in Agriculture. 30(2): 335-342. (doi: 10.13031/aea.30.10151) @2014
Authors: Abraham M. Asmare, Berhanu A. Demessie, Ganti S. Murthy
Keywords: Wastewater, Chlorella vulgaris, Scenedesmus dimorphus, Microalgae coculture, Nitrate removal, Phosphate removal.
Average specific growth rates (and biomass concentrations) the S. dimorphus, C. vulgaris, and their coculture were 0.263 d-1 (0.290±0.059 g/L), 0.063 d-1 (0.145±0.011 g/L), and 0.250 d-1 (0.400±0.060 g/L) d-1 at 10% manure, and 0.232 d-1 (0.543±0.149 g/L), 0.234 d-1 (0.364±0.113 g/L), and 0.289 d-1(0.612±0.255 g/L) at 25% manure, respectively. Based on the results it was evident that the strains S. dimorphus and C. vulgaris have different capacities for accumulation of biomass production (S. dimorphus is higher), lipid accumulation (S. dimorphus is higher), chlorophyll (C. vulgaris is higher), total suspended solids (TSS) (C. vulgaris is higher), and volatile suspended solids (VSS) (S. dimorphus is higher). It was found that mixed coculture had higher biomass growth, specific growth rate, and removal efficiency of nitrogen, phosphorous, and TSS for the 25% dairy wastewater. The results were similar for 10% dairy wastewater except for the specific growth rate and nitrogen removal efficiency which were higher for the S. dimorphus monoculture. These capacities can be leveraged in mixed coculture to achieve higher treatment efficiencies compared to monocultures. The results can inform managers of agricultural and municipal wastewater facilities as they make decisions about whether to include algal technology in future upgrades and expansion.