Increased nitrous oxide (N2O) in the atmosphere is of global concern. Biofiltration has been studied for gaseous nitrogen treatments in drinking water environments; however, the molecular mechanisms mediating N2O accumulation in denitrification biofilters have not been quantified. Five denitrification biofilters were developed in this study and all achieved high removal efficiencies for total nitrogen (TN: 72.4–92.7%), nitrate nitrogen (NO3 ⁻-N: 88.6–98.2%) and chemical oxygen demand (COD: 79.3–90.0%) across a low-temperature gradient (5–25°C). Denitrification coupling with anaerobic ammonium oxidation (ANAMMOX) and dissimilatory nitrate reduction to ammonium (DNRA) processes yielded the presently robust treatment performance. Nitrite availability limited TN removal at 5–15°C. Our findings indicate that temperature affected N2O accumulation indirectly by controlling the balance of nitrite versus N2O reductase carrying microorganisms. In addition, our results demonstrated that genetic association was an important index reflecting the relative intensity of N2O accumulation at low temperatures.

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nitrite availability denitrification biofilters genetic association lowtemperature gradient temperatures total nitrogen tn 724927 nitrate nitrogen noinf locpost3inf sup locpostsupn 886982 anaerobic ammonium oxidation tn removal ammonium dnra processes nitrate reduction gaseous nitrogen treatments chemical oxygen demand cod 793900 drinking water nitrous oxide ninf locpost2info balance of nitrite versus ninf locpost2info reductase carrying microorganisms

Rongjing Wang, Guodong Ji,Yan Zhang,.Quantitative responses of nitrous oxide accumulation to genetic associations across a temperature gradient within denitrification biofilters. 102 (0),.

Rongjing Wang, Guodong Ji,Yan Zhang,"Quantitative responses of nitrous oxide accumulation to genetic associations across a temperature gradient within denitrification biofilters" 102

Rongjing Wang, Guodong Ji,Yan Zhang,"Quantitative responses of nitrous oxide accumulation to genetic associations across a temperature gradient within denitrification biofilters"