Journal
BIORESOURCE TECHNOLOGY
Volume 101, Issue 1, Pages 58-64Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.02.076
Keywords
Scenedesmus obliquus; Chlorella vulgaris; Immobilized cells; Nutrients removal; Wastewater treatment
Funding
- Universidad Autonoma de Baja California [568]
- Mexican Department of Education (SEP)
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Two species of microalgae growing as immobilized and free-cells were compared to test its ability to remove N and P in batch Cultures of urban wastewater. The best microalgae-cell growth configuration was selected to be tested in bioreactor operated in semi-continuous mode. Scenedesmus obliquus showed a higher N and P uptake rate in urban wastewater than Chlorella vulgaris. When tested in semi-continuous mode and with the re-calcification of beads, S. obliquus was more effective in removing N and P for longer periods (181 h) than batch cultures; fecal coliforms removal was good (95%) although the final concentration was still unsuitable for discharge to natural water bodies. Protein and lipids content analysis suggest that, from a practical point of view, immobilized systems could facilitate the separation of the biomass from the treated wastewater although in terms of nutritional value of the biomass, immobilized systems do not represent an advantage over free-cell systems. (C) 2009 Elsevier Ltd. All rights reserved.
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