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Published on: December 15, 2017
Model-based optimisation of the biological performance of a sidestream MBR
1BIOMATH, Department of Applied Mathematics, Biometrics and Process Control, Ghent University, Coupure Links 653, 9000 Gent, Belgium. ingmar.nopens@.ugent.be
Summary
Optimizing a pilot-scale membrane bioreactor (MBR) improved nitrogen removal by 42% for ammonium and 32% for nitrate. However, this enhanced biological nutrient removal came at the cost of a 39% decrease in phosphorus removal efficiency.
Area of Science:
- Environmental Engineering
- Biotechnology
- Water Treatment
Background:
- Membrane bioreactors (MBRs) are advanced wastewater treatment systems.
- Optimizing MBR operation is crucial for effective nitrogen (N) and phosphorus (P) removal.
- Balancing N and P removal presents operational challenges.
Purpose of the Study:
- To optimize the operational parameters of a pilot-scale side-stream MBR.
- To evaluate the impact of dissolved oxygen (DO) set-point, sludge residence time (SRT), and internal recirculation (IR) on biological performance.
- To identify optimal operating conditions for enhanced nitrogen and phosphorus removal.
Main Methods:
- A model-based approach using a calibrated ASM2d MBR model.
- Two-tier scenario analysis to simulate operational variations.
- Investigating three key degrees of freedom: DO set-point, SRT, and IR rate.
Main Results:
- Achieved a 42% reduction in effluent ammonium concentration.
- Achieved a 32% reduction in effluent nitrate concentration.
- Observed a 39% increase in effluent phosphate concentration, indicating a compromise in P removal.
Conclusions:
- Model-based optimization can enhance nitrogen removal in MBRs.
- There is an inherent trade-off between nitrogen and phosphorus removal efficiencies in MBRs.
- Operational adjustments require careful consideration to balance nutrient removal goals.
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