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- Title
Achieving stable partial nitritation for low strength wastewater at low temperature in a continuous moving bed biofilm reactor under high DO concentration through ratio control.
- Authors
Wei Bian; Dongbo Liang; Shuyan Zhang; Jun Li; Qing Zhao; Yiqing Sun
- Abstract
To promote the application of nitritation in actual domestic wastewater treatment, stable partial nitritation (PN) in a moving bed biofilm reactor treating low strength wastewater at low temperature (15°C, 12°C and 8°C) was successfully achieved under high dissolved oxygen (DO) concentration through ratio control which was the ratio of DO and total ammonia nitrogen (TAN). The mechanism of achieving nitritation through ratio control and the effect of organic carbon contained in wastewater on achieving stable PN at temperature of 8°C were investigated. Results indicated that at temperature of 12°C stable nitritation could be achieved through controlling ratio not exceeding 0.16 exerting effective repression on NOB populations which would be washed out slowly. Organic carbon is largely beneficial to achievement of stable PN at temperature of 8°C, resulting in looser oxygen-limited conditions (DO/TAN: 0.2) than that (DO/TAN: 0.16) at temperature of 12°C. But not the more organic carbon the better nitritation performance, an equal number of COD (C/N = 1) should be adequate. In practical applications, to achieve stable PN for actual mainstream under high DO concentration at temperature not lower than 8°C, TAN-dominated ratio control should be a suitable control strategy.
- Subjects
SEWAGE purification; MOVING bed reactors; DISSOLVED oxygen in water
- Publication
Desalination & Water Treatment, 2018, Vol 129, p84
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2018.23021