Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Nitrogen Transformations and Microbial Characterization of Soils from Passive Nitrogen Removing Biofilters
To investigate spatial variability, regulation, and mass balances of N transformations in nitrogen-removing biofilters (NRBs), production and consumption were measured in suboxic incubations of nitrified percolate combined with sand and woodchip samples collected at different depths from an excavated NRB. Potential production averaged 0.34 and in slurries amended with 18 and and accounted for 82% (range 70%–100%) of consumption in incubations. Production occurred despite suboxic () conditions in slurries and varied across sample depth intervals with the distribution of nirK genes. To identify the fate of residual , was measured in two additional incubations ( production: 0.33 and ) but no net gain was found. Bioassimilation may account for N mass balance deficits. Anoxic incubations of sand, methanol, and nitrified percolate () produced 3.5 times greater production relative to incubations without methanol and suggested production rates were C limited. This study provides evidence that complete denitrification is the dominant pathway for N transformations in NRBs and can be enhanced by labile carbon.
Nitrogen Transformations and Microbial Characterization of Soils from Passive Nitrogen Removing Biofilters
To investigate spatial variability, regulation, and mass balances of N transformations in nitrogen-removing biofilters (NRBs), production and consumption were measured in suboxic incubations of nitrified percolate combined with sand and woodchip samples collected at different depths from an excavated NRB. Potential production averaged 0.34 and in slurries amended with 18 and and accounted for 82% (range 70%–100%) of consumption in incubations. Production occurred despite suboxic () conditions in slurries and varied across sample depth intervals with the distribution of nirK genes. To identify the fate of residual , was measured in two additional incubations ( production: 0.33 and ) but no net gain was found. Bioassimilation may account for N mass balance deficits. Anoxic incubations of sand, methanol, and nitrified percolate () produced 3.5 times greater production relative to incubations without methanol and suggested production rates were C limited. This study provides evidence that complete denitrification is the dominant pathway for N transformations in NRBs and can be enhanced by labile carbon.
Nitrogen Transformations and Microbial Characterization of Soils from Passive Nitrogen Removing Biofilters
Waugh, Stuart (Autor:in) / Mao, Xinwei (Autor:in) / Heufelder, George (Autor:in) / Walker, Harold (Autor:in) / Gobler, Christopher J. (Autor:in)
28.02.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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