Outdoor production of microalgae biomass at pilot-scale in seawater using centrate as the nutrient source
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In this paper the outdoor production of marine microalgae in tubular photobioreactors was studied, using real centrate from an urban wastewater treatment plant as the nutrient source. Experiments were performed modifying the centrate percentage in the culture medium (20, 30, 40 and 50%) and the dilution rates (0.2 and 0.3 day(-1)) to study the phenomena taking place. Results confirm that marine microalgae can be produced under outdoor conditions using centrate as the nutrient source; at the same time treating it and recovering the nutrients contained in the centrate. The most efficient conditions for producing biomass were using 20% centrate and dilution rate of 0.3 day(-1), the biomass productivity was 15.62 g(biomass) .m(-2) . day(-1) and the photosynthetic performance was 0.54 g(biomass) . E-1 and 2.6%. Regarding nutrients, centrate does not contain enough carbon to avoid carbon limitation thus the supply of carbon from flue gas is necessary. On the other hand, centrate is rich in n...