Factors controlling nitrous oxide emissions from a full-scale activated sludge system in the tropics
| Autor: | Débora Cynamon Kligerman, Jaime Lopes da Mota Oliveira, William Zamboni de Mello, Kartik Chandran, Renato P. Ribeiro, Samara A. Andrade, Ariane Coelho Brotto |
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| Rok vydání: | 2014 |
| Předmět: |
Tropical Climate
Sewage Health Toxicology and Mutagenesis Climate Change Environmental engineering Nitrous Oxide Tropics Climate change chemistry.chemical_element General Medicine Nitrous oxide equipment and supplies Pollution Nitrogen Water Purification chemistry.chemical_compound Activated sludge chemistry Environmental chemistry Greenhouse gas Environmental Chemistry Environmental science Sewage treatment Nitrification |
| Zdroj: | Environmental science and pollution research international. 22(15) |
| ISSN: | 1614-7499 |
| Popis: | Despite interest in characterizing nitrous oxide (N2O) emissions from wastewater treatment plants (WWTPs) in several parts of the globe, there are few studies in tropical zones. This study focus on the contribution of the scientific knowledge of anthropogenic nitrogen greenhouse gas emissions to climate change in tropical countries, investigating factors controlling N2O emissions in a non-biological nitrogen removal municipal WWTP. In terms of operational parameters, dissolved oxygen (DO) concentrations displayed a biphasic impact on N2O production and emission, with the highest emission at DO of 2.0 mg O2 L(-1). The low solids retention time of 3 days also played a significant role, leading to nitrite accumulation, which is an important trigger for N2O production during nitrification. Furthermore, other factor especially important for tropical countries, namely, temperature, also had a positive correlation with N2O production. Emission factors estimated for this study were 0.12 (0.02-0.31)% of the influent total nitrogen load and 8.1 (3-17) g N2O person(-1) year(-1), 2.5 times higher than currently proposed emission factors. Therefore, the highly variability and dependence on operational parameters reinforce the use of a single emission factor is inadequate, especially for developing countries with limited or variable extent of biological wastewater treatment and in regions of the world with widely varying climate patterns. |
| Databáze: | OpenAIRE |
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