A MULTISTAGE GRADUAL NITROGENREDUCTION STRATEGY FOR INCREASED LIPID PRODUCTIVITY AND NITROGEN REMOVAL IN WASTEWATER USING Chlorella vulgaris AND Scenedesmus obliquus

Brazilian Journal of Chemical Engineering

J. C. Robles-heredia¹  J. C. Sacramento-rivero¹  Y. Canedo-lópez¹  A. Ruiz-marín¹  L. E. Vilchiz-bravo¹ 

关键词: Nitrogen limitation;    Lipid productivity;    Multistage;    Microalgae;    Biodiesel;   

DOI  :  10.1590/0104-6632.20150322s00003304

来源: SciELO

【 摘 要 】

AbstractChlorella vulgaris and Scenedesmus obliquuswere grown in artificial-wastewater using a new nitrogen-limitation strategy aimed at increasing lipid productivity. This strategy consisted in a multi-stage process with sequential reduction of N-NH4 concentration (from 90 to 60, 40, and 20 mg.L-1) to promote a balance between cell growth and lipid accumulation. Lipid productivity was compared against a reference process consisting of nitrogen reduction in two stages, where the nitrogen concentration was suddenly reduced from 90 mg.L-1 to three different concentrations (10, 20, and 30 mg.L-1). In the multi-stage mode, only C. vulgaris exhibited a net lipid-productivity increase. Lipid content of S. obliquus did not present a significant increase, thus decreasing lipid productivity. The highest lipid productivities were observed in the two-stage mode for both S. obliquus and C. vulgaris (194.9 and 133.5 mg.L-1.d-1, respectively), and these values are among the highest reported in the literature to date.

【 授权许可】

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