Biological groundwater denitrification systems: Lab-scale trials aimed at nitrous oxide production and emission assessment

The Science of the Total Environment
Marco CapodiciGaspare Viviani

Abstract

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, 75mgNO3-NL-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...Continue Reading

Citations

Aug 15, 2020·Critical Reviews in Biotechnology·Hua ZhongHojae Shim
Sep 12, 2018·Applied Microbiology and Biotechnology·Fabrizio SabbaRobert Nerenberg
Feb 5, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Shiyang ZhangKefeng Zhang
Mar 18, 2021·Environmental Science and Pollution Research International·George Kwame Amoako-NimakoFangmin Chen
Mar 31, 2021·Environmental Science and Pollution Research International·Barbara Muñoz-PalazonAlejandro Gonzalez-Martinez
May 1, 2021·Journal of Environmental Management·Muhammad BilalShaohua Chen

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