The biomass and lipid/carbohydrate production by a green microalga Scenedesmus obliquus under mixotrophic condition using food wastewater and flue gas CO2 with municipal wastewater was investigated. Different dilution ratios (0.5–2%) of municipal wastewater with food wastewater were evaluated in the presence of 5, 10 and 14.1% CO2. The food wastewater (0.5–1%) with 10–14.1% CO2 supported the highest growth (0.42–0.44 g L−1), nutrient removal (21–22 mg TN L−1), lipid productivity (10–11 mg L−1day−1) and carbohydrate productivity (13–16 mg L−1day−1) by S. obliquus after 6 days of cultivation. Food wastewater increased the palmitic and oleic acid contents up to 8 and 6%, respectively. Thus, application of food wastewater and flue gas CO2 can be employed for enhancement of growth, lipid/carbohydrate productivity and wastewater treatment efficiency of S. obliquus under mixotrophic condition, which can lead to development of a cost effective strategy for microalgal biomass production.
Journal of Environmental Management – Elsevier
Published: Aug 15, 2015
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