Enhancing Dissolved Oxygen and Biofilm Formation in Municipal Wastewater Treatment Systems Using Magnetic Air Stone
Publication: Journal of Environmental Engineering
Volume 141, Issue 7
Abstract
A new kind of magnetic porous carrier named magnetic air stone (MAS) was prepared by coating air stone (AS) with ferrofluid nanoparticles. Characterization by X-ray diffraction, scanning electron microscope, and vibrating sample magnetometer reveals that nanoparticles embedded in air stone were paramagnetic with saturation magnetization of . Moreover, an analysis of biofilm formation on MAS was run. The results show that dissolved oxygen increased 50%, mass of the biofilm increased 32%, and biofilm adhesion increased 21%. The main reason for the enhancement of dissolved oxygen was the sorption performance of MAS for removing ions from aqueous solution. Biofilm formation acceleration was due to the ferrofluid nanoparticles used to modify AS into MAS, which are hydrophobic, and hydrophobic cells readily adhere to hydrophobic surfaces. This study demonstrated that the magnetic air stone developed in our research project could be potentially used as a cost-effective carrier for municipal wastewater treatment.
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Acknowledgments
This study was funded by National Nature Science Foundation of China (NSFC: 50978050, 51278093), the Science & Technology Department of Jilin Province (20110406) and the Major Projects of National Water Pollution Control and Management Technology, China (2012ZX07201-006).
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Published In
Journal of Environmental Engineering
Volume 141 • Issue 7 • July 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Aug 9, 2014
Accepted: Dec 12, 2014
Published online: Jan 21, 2015
Discussion open until: Jun 21, 2015
Published in print: Jul 1, 2015
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