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Partial-nitritation of low-strength anaerobic effluent: A moderate-high dissolved oxygen concentration facilitates ammonia-oxidizing bacteria disinhibition and nitrite-oxidizing bacteria suppression

Lei, Zhen, Wang, Lianxu, Wang, Jun, Yang, Shuming, Hou, Zhaoyang, Wang, Xiaochang C., Chen, Rong·2021·Science of The Total Environment
DOI 10.1016/j.scitotenv.2021.145337
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Abstract

Integrating anaerobic treatment with partial nitritation (PN)/anammox is a promising technology to achieve energy-efficient wastewater treatment, while partial nitritation of the mainstream anaerobic effluent (Aneff) was rarely reported. A PN reactor fed with low-strength Aneff was employed in this study to investigate the performance and technology bottleneck of this process. When operated at low dissolved oxygen (DO) concentration (0.30-0.43 mg/L), gene coding hydroxylamine oxidation (hao) was severely suppressed by bio-refractory organics, which results in a decreased ammonia-oxidizing bacteria activity and nitrite accumulation rate. The ammonium conversion and nitrite accumulation were recovered by increasing the DO concentration to a moderate-high level (1.10 ± 0.20 mg/L) and achieved long-term stable operation. At this condition, hao showed a dramatic increase while gene encoding nitrite oxidoreductase was appropriately suppressed; the effluent NO 2 - /NH 4 + ratio reached 1.17, and a low NO 3 - /NO x - ratio of 0.38 was achieved simultaneously. The findings in this study revealed the adverse effects of Aneff on PN and supported a practical operating strategy for efficient PN of Aneff.

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Metadata

Authors
Lei, Z., Wang, L., Wang, J., Yang, S., Hou, Z., Wang, X. C., & Chen, R.
Venue
Science of The Total Environment
Publisher
Elsevier BV
Published
2021-05
Volume
770
Pages
145337
ISSN
0048-9697
DOI
10.1016/j.scitotenv.2021.145337
Cited by
37
References
0
Language
en
Licence
Funders
  • National Natural Science Foundation of China (51978560)
  • Ministry of Science and Technology of the People's Republic of China
  • Shaanxi Provincial Science and Technology Department
  • National Key Research and Development Program of China (2017YFE0127300)

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