Assessment of online monitoring strategies for measuring N2O emissions from full-scale wastewater treatment systems
Clark-Type nitrous oxide (N 2 O) sensors are routinely used to measure dissolved N 2 O concentrations in wastewater treatment plants (WWTPs), but have never before been applied to assess gas-phase N 2 O emissions in full-scale WWTPs. In this study, a full-scale N 2 O gas sensor was tested and valida...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:10256/14353 |
| Acceso en línea: | http://hdl.handle.net/10256/14353 |
| Access Level: | acceso abierto |
| Palabra clave: | Aigües residuals -- Depuració Sewage -- Purification Gasos d'efecte hivernacle Greenhouse gases Aigües residuals -- Plantes de tractament Sewage disposal plants |
| Sumario: | Clark-Type nitrous oxide (N 2 O) sensors are routinely used to measure dissolved N 2 O concentrations in wastewater treatment plants (WWTPs), but have never before been applied to assess gas-phase N 2 O emissions in full-scale WWTPs. In this study, a full-scale N 2 O gas sensor was tested and validated for online gas measurements, and assessed with respect to its linearity, temperature dependence, signal saturation and drift prior to full-scale application. The sensor was linear at the concentrations tested (0-422.3, 0-50 and 0-10 ppmv N 2 O) and had a linear response up to 2750 ppmv N 2 O. An exponential correlation between temperature and sensor signal was described and predicted using a double exponential equation while the drift did not have a significant influence on the signal. The N 2 O gas sensor was used for online N 2 O monitoring in a full-scale sequencing batch reactor (SBR) treating domestic wastewater and results were compared with those obtained by a commercial online gas analyser. Emissions were successfully described by the sensor, being even more accurate than the values given by the commercial analyser at N 2 O concentrations above 500 ppmv. Data from this gas N 2 O sensor was also used to validate two models to predict N 2 O emissions from dissolved N 2 O measurements, one based on oxygen transfer rate and the other based on superficial velocity of the gas bubble. Using the first model, predictions for N 2 O emissions agreed by 98.7% with the measured by the gas sensor, while 87.0% similarity was obtained with the second model. This is the first study showing a reliable estimation of gas emissions based on dissolved N 2 O online data in a full-scale wastewater treatment facility |
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