Effect of temperature on N₂O emissions from a highly enriched nitrifying granular sludge performing partial nitritation of a lowstrength wastewater
In the race to achieve a sustainable urban wastewater treatment plant, not only the energy requirements have to be considered but also the environmental impact of the facility. Thus, nitrous oxide (N₂O) emissions are a key-factor to pay attention to, since they can dominate the total greenhouse gase...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2017 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:181898 |
| Acceso en línea: | https://ddd.uab.cat/record/181898 https://dx.doi.org/urn:doi:10.1016/j.chemosphere.2017.07.017 |
| Access Level: | acceso abierto |
| Palabra clave: | Nitrous oxide Emission factors Partial nitritation Temperature Nitrotoga |
| Sumario: | In the race to achieve a sustainable urban wastewater treatment plant, not only the energy requirements have to be considered but also the environmental impact of the facility. Thus, nitrous oxide (N₂O) emissions are a key-factor to pay attention to, since they can dominate the total greenhouse gases emissions from biological wastewater treatment. In this study, N2O production factors were calculated during the operation of a granular sludge airlift reactor performing partial nitritation treating a low-strength synthetic influent, and furthermore, the effect of temperature on N₂O production was assessed. Average gas emission relative to conversion of ammonium was 1.5 ± 0.3% and 3.7 ± 0.5% while the effluent contained 0.5 ± 0.1% and 0.7 ± 0.1% (% N-oxidized) at 10 and 20 ºC, respectively. Hence, temperature increase resulted in higher N2O production. The reasons why high temperature favoured N₂O production remained unclear, but different theoretical hypotheses were suggested. |
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