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Biofiltration System Denitrification: Low C/N Trigger Dissimilatory Nitrate Reduction to Ammonium.
- Source :
- Environmental Engineering Science; May2022, Vol. 39 Issue 5, p484-491, 8p
- Publication Year :
- 2022
-
Abstract
- To efficiently remove nitrogen from the biofiltration system, the effect of different electron donors and C/N (dissolved organic carbon [DOC]/nitrate) on dissimilatory nitrate reduction to ammonium (DNRA), and denitrification was studied. Electron donor addition significantly increased the gene abundance (nirS and nrfA) and denitrification rate, resulting in higher NO<subscript>3</subscript><superscript>−</superscript>-N removal efficiency (over 70%) in refractory organic carbon (bagasse and rice straw) groups. Easily degradable organic carbon (sucrose) caused rapid DOC accumulation, fueling the DNRA process, and NH<subscript>4</subscript><superscript>+</superscript>-N accumulation. Inorganic electron donors (ferrous sulfate and sodium sulfide) were unsuitable due to poor denitrification gene abundance, low rate, as well as low NO<subscript>3</subscript><superscript>−</superscript>-N removal efficiency. The decrease in C/N was beneficial to denitrification but restricted the occurrence of DNRA, finally reducing N retention capacity. Therefore, the regulation of C/N can play a significant contributory role in the switching of denitrification and DNRA process. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10928758
- Volume :
- 39
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Environmental Engineering Science
- Publication Type :
- Academic Journal
- Accession number :
- 156893925
- Full Text :
- https://doi.org/10.1089/ees.2021.0152