Biological groundwater denitrification systems: Lab-scale trials aimed at nitrous oxide production and emission assessment
| Autor: | Vito Armando Laudicina, Marco Capodici, Gaspare Viviani, Alessia Avona |
|---|---|
| Přispěvatelé: | capodici marco, alessia avona, vito armando laudicina, gaspare viviani |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
Denitrification Settore AGR/13 - Chimica Agraria chemistry.chemical_element 010501 environmental sciences Nitrogen cycle 01 natural sciences chemistry.chemical_compound Permeable reactive barriers Biological groundwater denitrification Environmental Chemistry Nitrite Waste Management and Disposal Effluent 0105 earth and related environmental sciences Nitrous oxide Settore ICAR/03 - Ingegneria Sanitaria-Ambientale Biotrench 04 agricultural and veterinary sciences Pollution chemistry Greenhouse gas Environmental chemistry 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Carbon Groundwater |
| Popis: | Bio-trenches are a sustainable option for treating nitrate contamination in groundwater. However, a possible side effect of this technology is the production of nitrous oxide, a greenhouse gas that can be found both dissolved in the liquid effluent as well as emitted as off gas. The aim of this study was to analyze NO3 − removal and N2O production in lab-scale column trials. The column contained olive nut as organic carbon media. The experimental study was divided into three phases (I, II and III) each characterized by different inlet NO3 − concentrations (30, 50, 75 mg NO3-N L−1 respectively). Sampling ports deployed along the length of the column allowed to observe the denitrification process as well as the formation and consumption of intermediate products, such as nitrite (NO2 −) and nitrous oxide (N2O). In particular, it was observed that N2O production represent only a small fraction of removed NO3 − during Phase I and II, both for dissolved (0.007%) and emitted (0.003%) phase, and it was recorded a high denitrification efficiency, over 99%. Nevertheless, significantly higher values were recorded for Phase 3 concerning emitted phase (0.018%). This fact is due to increased inlet concentration which resulted in a carbon limitation and in a consequent decrease in denitrification efficiency (76%). |
| Databáze: | OpenAIRE |
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