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Updated: Jun 17, 2026

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
Published on: October 7, 2020
Control strategy of shortcut nitrification.
Gang Lu1, Ping Zheng, Ren-Cun Jin
1Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, China.
Shortcut nitrification, an energy-saving wastewater treatment, was optimized using an internal-loop airlift bioreactor. The study identified optimal parameters and a new control strategy for efficient ammonium removal from wastewater.
Area of Science:
- Environmental Science
- Biotechnology
- Chemical Engineering
Background:
- Shortcut nitrification is a key process for efficient biological denitrogenation of ammonium-rich wastewater.
- Optimizing operational parameters is crucial for enhancing the performance of shortcut nitrification systems.
Purpose of the Study:
- To investigate the combined effects of operational parameters on shortcut nitrification performance in an internal-loop airlift bioreactor.
- To determine the optimal conditions for efficient ammonium removal and establish a novel control strategy.
Main Methods:
- An orthogonal experiment was employed to study the influence of various operational parameters.
- An internal-loop airlift bioreactor was utilized for shortcut nitrification.
- A new "priority + combination" control strategy was developed and tested.
Main Results:
- Optimal parameters identified: 35°C, pH 8.0, 1.0 mg/L dissolved oxygen, 4 mmol/L ammonium, and 16 h HRT.
- Reactor startup achieved within 42 days with stable performance.
- Effluent nitrite/nitrate (NO2-/NOx-) levels averaged 91.4% removal efficiency.
Conclusions:
- Shortcut nitrification in an internal-loop airlift bioreactor is feasible and efficient for ammonium-rich wastewater.
- The identified optimal parameters and the "priority + combination" control strategy significantly enhance reactor performance and stability.
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