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International Journal of Chemical Engineering
Volume 2014, Article ID 310285, 6 pages
Research Article

Growing Chlorella vulgaris in Photobioreactor by Continuous Process Using Concentrated Desalination: Effect of Dilution Rate on Biochemical Composition

1Department of Food Science and Technology, Federal University of Santa Catarina, Avenue Admar Gonzaga 1346, Itacorubi, 88034-001 Florianopolis, SC, Brazil
2Laboratory of Environmental Engineering, University of South Santa Catarina (UNISUL), Avenue Pedra Branca, Unidade Pedra Branca, 88137-270 Palhoca, SC, Brazil
3Department of Chemical Engineering, Federal University of Campina Grande, Avenue Aprigio Veloso 882, Bodocongo, 58429-170 Campina Grande, PB, Brazil

Received 26 March 2014; Revised 16 June 2014; Accepted 16 June 2014; Published 2 July 2014

Academic Editor: Diego T. Santos

Copyright © 2014 Ângelo Paggi Matos et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Desalination wastewater, which contains large amount of salt waste, might lead to severely environmental pollution. This study evaluated the effect of dilution rate ( day−1) on microalgal biomass productivity, lipid content, and fatty acid profile under steady-state condition of Chlorella vulgaris supplemented with concentrated desalination. Continuous culture was conducted for 55 days. Results show that the biomass productivity ( ) varied from 57 to 126 mg L−1 d−1 (dry mass) when the dilution rate ranged from 0.1 to 0.3 day−1. At lowest dilution rate ( day−1), the continuous culture regime ensured the highest values of maximum biomass concentration (  mL−1) and protein content (52%). Biomass lipid content was an increasing function of . The most abundant fatty acids were the palmitic ( ) at day−1 and the gamma-linolenic acid ( ) at day−1 ones. These fatty acids present 14 to 18 carbons in the carbon chain, being mainly saturated and polyunsaturated, respectively. Overall, the results show that continuous culture is a powerful tool to investigate the cell growth kinetics and physiological behaviors of the algae growing on desalination wastewater.