Mixotrophic cultivation of a microalga Scenedesmus obliquus in municipal wastewater supplemented with food wastewater and flue gas CO2 for biomass production
- Mixotrophic cultivation of a microalga Scenedesmus obliquus in municipal wastewater supplemented with food wastewater and flue gas CO2 for biomass production
- 지민규; 윤승주; 윤현식; 박영태; 박상현; 김병석; 최재영; 김동
- S. obliquus; Biomass; Food wastewater; Flue gas CO2; Bio-energy
- Issue Date
- VOL ., NO .
- Microalgae have gained much attention in recent years and have been utilized for various applications including wastewater treatment, CO2 mitigation and as feedstock for biofuel production. Integration of algal systems with the existing industrial or waste treatment activity can emerge as an effective dual strategy for cost effective biomass production with simultaneous wastewater utilization . Microalgae biomass production can be performed through autotrophic cultivation in a photobioreactor by using solar energy for fixing CO2. Heterotrophic or mixotrophic cultivation of microalgae using organic compounds (i.e., glucose and acetate) as energy and carbon sources can also be employed for biomass production. Among the aforementioned strategies, mixotrophic operation possess several advantages including elimination of light requirement, higher microalgae growth, cost effective biomass harvesting and substrate degradation .
In this study, the biomass and lipid/carbohydrate production by a green microalga Scenedesmus obliquus under mixotrophic condition using food wastewater (FW) and flue gas CO2 with municipal wastewater (MWW) was investigated. Different dilution ratios (0.5-2%) of MWW with FW were evaluated in the presence of 5, 10 and 14.1% CO2. The FW (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-1 day-1) and carbohydrate productivity (13-16 mg L-1 day-1) by S. obliquus after 6 days of cultivation. FW increased the palmitic and oleic acid contents up to 8 and 6%, respectively. Thus, application of FW 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.
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