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Control of nitrate ricirculation flow in predenitrification systems.
Zhiguo Yuan1, Adrian Oehmen, Pernille Ingildsen
1The Advanced Wastewater Management Centre, The University of Queensland, St Lucia, Australia. Zhiguo@awmc.uq.edu.au
Summary
Controlling nitrate recirculation in predenitrification systems is key. Maintaining nitrate levels around 2 mgN/L at the anoxic zone outlet maximizes biodegradable COD usage for efficient nitrate removal.
Area of Science:
- Environmental Engineering
- Wastewater Treatment
- Nitrogen Removal Processes
Background:
- Predenitrification systems require effective control of nitrate recirculation flow.
- Optimizing the use of influent biodegradable chemical oxygen demand (bCOD) is crucial for efficient nitrate removal.
Purpose of the Study:
- To address the control of nitrate recirculation flow in predenitrification systems.
- To identify a control strategy that maximizes bCOD utilization for denitrification.
Main Methods:
- Elementary mass balance analysis was performed.
- Simulation studies were conducted using the Simulation Benchmark from the European COST program.
Main Results:
- The control problem was divided into maintaining anoxic conditions and maximizing bCOD usage.
- A nitrate concentration setpoint of approximately 2 mgN/L at the anoxic zone outlet was found to achieve both objectives.
- This setpoint demonstrated robustness against variations in influent characteristics and sludge kinetics.
Conclusions:
- Maintaining a specific nitrate concentration at the anoxic zone outlet is an effective control strategy.
- This approach enhances the efficiency of predenitrification systems for nitrate removal.
- The proposed control strategy is reliable under varying operational conditions.