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[Characterization of bubble size distribution in ES-DAF unit]
Fu-tai Chen1, Hua Zuo, Jiu-yi Li
1State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Huan Jing Ke Xue= Huanjing Kexue
|August 28, 2004
Summary
This study introduces the Enhanced Dissolved Air Flotation (ES-DAF) system, which creates smaller bubbles without a costly air saturator. Smaller bubbles form with increased turbulence and cycle ratios, improving efficiency.
Area of Science:
- Environmental Engineering
- Fluid Dynamics
- Water Treatment Technologies
Context:
- Traditional Dissolved Air Flotation (DAF) systems often rely on expensive air saturators.
- A novel ES-DAF unit utilizes an ejector and static mixer with a recycle rotary pump.
- This design aims to reduce costs while maintaining or improving performance.
Purpose:
- To introduce and analyze the performance of the novel ES-DAF unit.
- To investigate the bubble size distribution within the ES-DAF system.
- To understand the factors influencing bubble formation and characteristics.
Summary:
- The ES-DAF unit, comprising an ejector and static mixer, was studied for bubble generation without a traditional air saturator.
- Bubble size distribution was analyzed using microscopy, revealing that smaller bubbles form with increased cycle ratios or decreased superficial air-water ratios.
- Enhanced turbulence intensity appears to increase nucleation sites, leading to smaller bubbles, while higher saturation pressure promotes bubble collision and coalescence.
Impact:
- Provides a cost-effective alternative for DAF systems in water treatment.
- Offers insights into optimizing bubble size for enhanced mass transfer in flotation processes.
- Contributes to the development of more efficient and economical water and wastewater treatment solutions.