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Published on: July 8, 2016
Enhanced aerobic nitrifying granulation by static magnetic field
Xin-Hua Wang1, Mu-He Diao, Ying Yang
1Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan 250100, China.
Bioresource Technology
|February 15, 2012
Summary
Applying a static magnetic field significantly speeds up the formation of aerobic nitrifying granules. This method reduces granulation time from 41 to 25 days by promoting iron accumulation and enhancing microbial activity.
Area of Science:
- Environmental Science
- Microbiology
- Chemical Engineering
Background:
- Aerobic nitrifying granules are crucial for treating high-strength ammonia wastewater.
- A significant challenge is the extended time required for activated sludge to form these granules.
Purpose of the Study:
- To investigate the effectiveness of a static magnetic field in accelerating aerobic nitrifying granulation.
- To understand the underlying mechanisms by which magnetic fields influence granulation.
Main Methods:
- Application of a 48.0mT static magnetic field to activated sludge.
- Element analysis to determine the impact on sludge composition.
- Long-term cycle experiments and fluorescence in-situ hybridization (FISH) analysis.
Main Results:
- The static magnetic field promoted iron compound accumulation in the sludge.
- Granulation time was reduced from 41 to 25 days.
- Enhanced settling properties, stimulated extracellular polymeric substances (EPS) secretion, and improved nitrite-oxidizing bacteria (NOB) activity and growth were observed.
Conclusions:
- Static magnetic field application is a novel and effective strategy for accelerating aerobic nitrifying granulation.
- The magnetic field enhances granulation by influencing sludge properties and microbial communities.
- This method offers a reliable approach to improve wastewater treatment efficiency.

