Nitrogen Removal over Nitrite by Aeration Control in Aerobic Granular Sludge Sequencing Batch Reactors
Abstract
:1. Introduction
2. Materials and Methods
2.1. Technical Setup
2.2. Experimental Schedule and Aeration Strategies
2.3. Analytical Methods
2.4. Nitrification Batch Tests
2.5. Quantification of Nitrite-Oxidizing Bacteria
2.6. Nitrous Oxide Tests
Run | N-Removal over | Aeration Strategy | COD Concentration |
---|---|---|---|
No. | (mgCOD·L−1) | ||
1 | NO2− | Constant DO 30% | 400 |
2 | NO2− | Constant DO 30% | 600 |
3 | NO2− | Intermittent aeration | 400 |
4 | NO2− | Intermittent aeration | 600 |
5 | NO3− | Constant DO 30% | 400 |
6 | NO3− | Constant DO 30% | 600 |
7 | NO3− | Intermittent aeration | 400 |
8 | NO3− | Intermittent aeration | 600 |
3. Results
3.1. Strategy for Aeration Phase Length Control
3.2. N-removal and NOB Abundance in the Parent Reactor
3.3. N-Removal and NOB Abundance at 20 °C
3.4. N-Removal and NOB Abundance at 15 °C
3.5. Nitrous Oxide Emissions and Concentrations in the Liquid Phase
Aeration Strategy | COD Concentration (mgCOD·L−1) | Nitrite Pathway (% of N load) 1 | Nitrate Pathway (% of N load) 1 |
---|---|---|---|
Intermittent aeration | 400 | 5.2 ± 1.1 | 0.8 ± 0.2 |
Intermittent aeration | 600 | 2.4 ± 0.8 | 0.7 ± 0.3 |
Constant aeration | 400 | 12.9 ± 2.1 | 9.3 ± 2.4 |
Constant aeration | 600 | 8.1 ± 1.7 | 5.9 ± 0.9 |
4. Discussion
5. Conclusions
Supplementary Files
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Lochmatter, S.; Maillard, J.; Holliger, C. Nitrogen Removal over Nitrite by Aeration Control in Aerobic Granular Sludge Sequencing Batch Reactors. Int. J. Environ. Res. Public Health 2014, 11, 6955-6978. https://doi.org/10.3390/ijerph110706955
Lochmatter S, Maillard J, Holliger C. Nitrogen Removal over Nitrite by Aeration Control in Aerobic Granular Sludge Sequencing Batch Reactors. International Journal of Environmental Research and Public Health. 2014; 11(7):6955-6978. https://doi.org/10.3390/ijerph110706955
Chicago/Turabian StyleLochmatter, Samuel, Julien Maillard, and Christof Holliger. 2014. "Nitrogen Removal over Nitrite by Aeration Control in Aerobic Granular Sludge Sequencing Batch Reactors" International Journal of Environmental Research and Public Health 11, no. 7: 6955-6978. https://doi.org/10.3390/ijerph110706955