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[Stability of shortcut nitrification-denitrification]
1College of Forest Resources and Environment, Northeast Forestry University, Harbin 150040, China. gdw@tsinghua.edu.cn
Huan Jing Ke Xue= Huanjing Kexue
|April 30, 2005
Summary
Shortcut nitrification-denitrification requires temperatures above 28°C for stability. Excess aeration disrupts this process, necessitating real-time control for reliable wastewater treatment.
Area of Science:
- Environmental Science
- Biotechnology
- Chemical Engineering
Context:
- Wastewater treatment processes are crucial for environmental protection.
- Sequencing Batch Reactors (SBRs) are widely used for treating industrial wastewater.
- Soybean wastewater presents unique challenges due to its composition.
Purpose:
- To investigate the impact of temperature and aeration time on shortcut nitrification-denitrification stability.
- To identify optimal conditions for stable shortcut nitrification-denitrification in SBRs.
- To understand the influence of excess aeration on nitrification pathways.
Summary:
- Shortcut nitrification-denitrification in SBRs treating soybean wastewater was found to be unstable below 28°C.
- Excessive aeration for 12 days shifted the process from shortcut to complete nitrification (nitrosation rate decreased from >96% to <39.3%).
- Real-time process control is essential for maintaining stable shortcut nitrification-denitrification.
Impact:
- Provides critical insights into optimizing wastewater treatment efficiency.
- Highlights the sensitivity of nitrification processes to operational parameters like aeration.
- Informs the development of more robust and controlled biological treatment systems.