Achieving stable mainstream nitrogen and phosphorus removal assisted by hydroxylamine addition in a continuous partial nitritation/anammox process from real sewage

Hydroxylamine (NH2OH) as the putative intermediate for anammox ensures the robustness of partial nitritation/anammox (PN/A) process; however, the feasible for NH2OH addition to improve the stability of PN/A process under low-strength ammonia (NH4+-N) condition need to be further investigated. In thi...

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Bibliographic Details
Published in:The Science of the total environment 2021-11, Vol.794, p.148478-148478, Article 148478
Main Authors: Liu, Wenlong, Shen, Chen, Liu, Chao, Zhang, Shujun, Hao, Shufeng, Peng, Yongzhen, Li, Jun
Format: Article
Language:English
Subjects:
Alternating anoxic/aerobic zones
IFAS
Municipal wastewater
NH2OH addition
Nitrogen and phosphorus removal
PN/A
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Summary:Hydroxylamine (NH2OH) as the putative intermediate for anammox ensures the robustness of partial nitritation/anammox (PN/A) process; however, the feasible for NH2OH addition to improve the stability of PN/A process under low-strength ammonia (NH4+-N) condition need to be further investigated. In this study, the restoration and steady operation of mainstream PN/A process were investigated to treat real sewage with in situ NH2OH added in a continuous alternating anoxic/aerobic with integrated fixed-film activated sludge (A3-IFAS) reactor. Results showed that the deteriorated PN/A process caused by nitrate (NO3−-N) built-up was rapidly restored with a distinct decrease of the NO3−-Nproduced/NH4+-Nconsumed ratio from 28.7% to
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2021.148478