Short and long term continuous hydroxylamine feeding in a granular sludge partial nitritation reactor

Short and long term continuous hydroxylamine feeding in a granular sludge partial nitritation reactor

Soler Jofra, A. (TU Delft BT/Environmental Biotechnology)
Schmidtchen, Lisbeth (Student TU Delft)
Olmo, Lluc (Universitat Autònoma de Barcelona)
van Loosdrecht, Mark C.M. (TU Delft BT/Environmental Biotechnology)
Pérez, Julio (Universitat Autònoma de Barcelona)

2022

Hydroxylamine is a nitrogen intermediate of ammonium oxidizing bacteria (AOB) that can transiently accumulate during nitrification. The impact of hydroxylamine on aerobic ammonium oxidations is still obscure. In the present study the short and long term impact of hydroxylamine on partial nitritation granular sludge was investigated. Dissolved oxygen was the governing factor determining the hydroxylamine impact in short term studies with continuous hydroxylamine feeding. Continuous short term hydroxylamine feeding together with low dissolved oxygen resulted in higher hydroxylamine accumulation, higher N₂O production and decreased or maintained ammonium consumption. Instead, high dissolved oxygen reduced hydroxylamine accumulation and N₂O production and increased ammonium consumption. Long term continuous hydroxylamine feeding reduced ammonium consumption rate while the constant nitrite production rate indicated that dosed hydroxylamine was mainly transformed to nitrite. This indicates that hydroxylamine was preferred over ammonium as substrate. Nitrosomonas sp. was shown to be predominant during continuous hydroxylamine feeding while the side community shifted.

Ammonium
Ammonium oxidizing bacteria
Hydroxylamine
Nitrite

http://resolver.tudelft.nl/uuid:acb85588-7854-4056-8379-788a30c0342d

https://doi.org/10.1016/j.watres.2021.117945

0043-1354

Water Research, 209

Institutional Repository

journal article

© 2022 A. Soler Jofra, Lisbeth Schmidtchen, Lluc Olmo, Mark C.M. van Loosdrecht, Julio Pérez