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Retrofitting activated sludge systems to intermittent aeration for nitrogen removal
1Mercedes-Benz Türk AS. Quality Management Department, Hoşdere Köyü Mevkii Sirat Deresi Hadimköy-Istanbul, Turkey.
Summary
This study introduces a design approach for intermittent aeration in activated sludge systems to improve nitrogen removal. Key parameters like aerated fraction and cycle time ratio are crucial for optimizing process performance and balancing denitrification.
Area of Science:
- Environmental Engineering
- Wastewater Treatment Technologies
- Process Modeling and Kinetics
Background:
- Existing activated sludge plants require retrofitting for enhanced nitrogen removal.
- Intermittent aeration is a key strategy for upgrading these systems.
- Process kinetics and modeling offer a robust framework for system design.
Purpose of the Study:
- To provide a conceptual approach for designing alternating activated sludge systems.
- To investigate the impact of specific operational parameters on nitrogen removal efficiency.
- To develop a design procedure integrating process stoichiometry and mass balance.
Main Methods:
- Application of process kinetics and modeling principles.
- Utilizing model simulations to analyze parameter effects.
- Incorporating process stoichiometry and mass balance into a design framework.
Main Results:
- Identified aerated fraction and cycle time ratio as critical parameters for process performance.
- Demonstrated the influence of these parameters, alongside sludge age, on nitrogen removal.
- Showcased the balance between denitrification potential and nitrogen availability.
Conclusions:
- The proposed design approach effectively utilizes process kinetics and modeling for intermittent aeration systems.
- Optimizing aerated fraction and cycle time ratio is essential for efficient nitrogen removal.
- The study provides a practical method for retrofitting existing plants for improved wastewater treatment.