Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 292, Issue -, Pages 155-163Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2015.02.060
Keywords
Recirculating aquaculture systems; Saline wastewater; Packed bed bioreactor; Microalgae; Heterotrophic nitrification; Aerobic denitrification
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Funding
- European Union (European Social Fund-ESF)
- Greek National Funds through the Operational Program Education and Lifelong Learning of the National Strategic Reference Framework (NSRF) - Research Funding Program: Heracleitus II. Investing in knowledge society is done through the European Social Fund
- FP7-project WATER4CROPS [311933]
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Currently, the treatment of aquaculture-origin effluents is mainly performed through land-based recirculating aquaculture systems (RAS). In this study, we evaluate and introduce a novel immobilized/packed bed bioreactor which uses a synthetic textile as the support medium. A marine microbial consortium was developed on the textile by its inoculation with the microalgae Picochlorum sp. The bioreactor was tested with variable loadings of C and N and showed outstanding performance approaching removal rates up to 95% within a few hours (4-5 h) of operation. Pyrosequencing analysis revealed a novel microbial consortium consisting mainly of chitrinomycetes, Pseudomonas sp. and the absence of beta-proteobacteria, which is the Class encompassing autotrophic nitrifiers. Quantitative polymerase chain reaction further confirmed these findings suggesting heterotrophic nitrification and aerobic denitrification as the principal mechanisms of N-removal from the bioreactor. Overall our findings reveal the potential of the AdvanTex System for the treatment of marine aquaculture effluents-COD reduction and N-removal, in a single stage. (C) 2015 Elsevier B.V. All rights reserved.
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