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Advanced treatment of residual nitrogen from biologically treated coke effluent by a microalga-mediated process using volatile fatty acids (VFAs) under stepwise mixotrophic conditions.
- Source :
-
Bioresource technology [Bioresour Technol] 2015 Sep; Vol. 191, pp. 488-95. Date of Electronic Publication: 2015 Mar 31. - Publication Year :
- 2015
-
Abstract
- This work describes the development of a microalga-mediated process for simultaneous removal of residual ammonium nitrogen (NH4(+)-N) and production of lipids from biologically treated coke effluent. Four species of green algae were tested using a sequential mixotrophic process. In the first phase-CO2-supplied mixotrophic condition-all microalgae assimilated NH4(+)-N with no evident inhibition. In second phase-volatile fatty acids (VFAs)-supplied mixotrophic condition-removal rates of NH4(+)-N and biomass significantly increased. Among the microalgae used, Arctic Chlorella sp. ArM0029B had the highest rate of NH4(+)-N removal (0.97 mg/L/h) and fatty acid production (24.9 mg/L/d) which were 3.6- and 2.1-fold higher than those observed under the CO2-supplied mixotrophic condition. Redundancy analysis (RDA) indicated that acetate and butyrate were decisive factors for increasing NH4(+)-N removal and fatty acid production. These results demonstrate that microalgae can be used in a sequential process for treatment of residual nitrogen after initial treatment of activated sludge.<br /> (Copyright © 2015 Elsevier Ltd. All rights reserved.)
- Subjects :
- Volatilization
Coke
Fatty Acids metabolism
Microalgae metabolism
Nitrogen metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1873-2976
- Volume :
- 191
- Database :
- MEDLINE
- Journal :
- Bioresource technology
- Publication Type :
- Academic Journal
- Accession number :
- 25881553
- Full Text :
- https://doi.org/10.1016/j.biortech.2015.03.112