Mechanisms of N2O production in salinity-adapted partial nitritation systems for high-ammonia wastewater treatment

Water Research X, Journal Year: 2025, Volume and Issue: 27, P. 100311 - 100311

Published: Feb. 3, 2025

Partial Nitritation/Anammox (PN/A) can achieve green, economical, and efficient biological nitrogen removal; however, the PN process contributes significantly to nitrous oxide (N2O, third most important greenhouse gas) emissions. Balancing stability of systems while reducing N2O emissions, particularly under varying salinity conditions, is a key challenge in applying PN/A for high-salinity high-ammonia wastewater treatment. This study explored long-term effects on performance emissions treating wastewater. The results showed that specific ammonia oxidation rates control two salinity-acclimated reactors were 78.84, 75.03, 42.60 mg N/(g VSS·h), indicating low (2.5 g NaCl/L) had minimal effect, high (10 inhibited ammonia-oxidating bacteria associated nitritation processes. Moreover, emission factors increased from 0.08 ± 0.04% 0.24 0.03% as rose 0 10 NaCl/L. Further analysis revealed stimulated production both aerobic anoxic stages. Particularly, by 2.84-11.14 times aerated stage 0.61-2.04 nonaerated (i.e. settling stages). Isotopic pathway indicated enhanced primarily stimulating nitrite reduction pathway. Additionally, mechanism investigation examined combined salinity-induced changes sludge properties microbial community These findings provide valuable insights treat high-strength understanding mechanisms

Language: Английский

Lake dissolved organic matters seasonal variations is a main driver of N2O emission: in molecular insights by using FT-ICR MS

Water Research X, Journal Year: 2025, Volume and Issue: unknown, P. 100321 - 100321

Published: Feb. 1, 2025

Language: Английский

Mitigating sulfide production in rising main sewers with HO2− treatment: A strategy to support sustainable management

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 161630 - 161630

Published: March 1, 2025

Language: Английский