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Numerical simulation of a mechanical flocculation process with multi-chambers in series.
Jie Zong1, Fang Yuan2, Minshu Zhan3
1School of Energy and Environment, Southeast University, Nanjing 210042, China; Southeast University - Monash University Joint Graduate School, Suzhou 215123, China.
Summary
Mechanical flocculators enhance phosphorus removal in wastewater treatment. Optimizing chamber configuration and impeller speeds improves efficiency and floc size, crucial for effective treatment.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Chemical Engineering
Background:
- Mechanical flocculation systems with multiple chambers are vital for advanced phosphorus removal in wastewater.
- Understanding the complex interplay of fluid dynamics and chemical reactions is key to optimizing these systems.
Purpose of the Study:
- To numerically investigate the performance of industrial-scale mechanical flocculators in series.
- To analyze the impact of system configuration (chamber number, connection design) and operational parameters (impeller speed) on phosphorus removal.
Main Methods:
- Utilized a computational fluid dynamics (CFD) model, extended to incorporate phosphorus removal chemical reactions.
- Simulated various configurations including different numbers of chambers, connection locations/sizes, and impeller speed combinations.
Main Results:
- Decreasing the number of chambers weakened vortexes and reactions, leading to smaller flocs and reduced removal efficiency.
- Connection location significantly influenced turbulent flow and performance indicators, while connection size had minimal impact.
- Increasing impeller speeds enhanced chemical reactions and enlarged the floc size distribution gradient.
Conclusions:
- The number and connection design of flocculation chambers are critical for optimizing phosphorus removal efficiency and floc characteristics.
- Impeller speed adjustments can further enhance treatment performance by influencing floc formation and reaction kinetics.
