title: Enhanced aerobic nitrifying granulation by static magnetic field.
abstract: One of the main challenging issues for aerobic nitrifying granules in treating high strength ammonia wastewater is the long granulation time required for activated sludge to transform into aerobic granules. The present study provides a novel strategy for enhancing aerobic nitrifying granulation by applying an intensity of 48.0mT static magnetic field. The element analysis showed that the applied magnetic field could promote the accumulation of iron compounds in the sludge. And then the aggregation of iron decreased the full granulation time from 41 to 25days by enhancing the setting properties of granules and stimulating the secretion of extracellular polymeric substances (EPS). Long-term, cycle experiments and fluorescence in-situ hybridization (FISH) analysis proved that an intensity of 48.0mT magnetic field could enhance the activities and growth of nitrite-oxidizing bacteria (NOB). These findings suggest that magnetic field is helpful and reliable for accelerating the aerobic nitrifying granulation.
authors.affiliation: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan 250100, China.
authors.forename: Xin-Hua
authors.initials: XH
authors.lastname: Wang
authors.forename: Mu-He
authors.initials: MH
authors.lastname: Diao
authors.forename: Ying
authors.initials: Y
authors.lastname: Yang
authors.forename: Yi-Jing
authors.initials: YJ
authors.lastname: Shi
authors.forename: Ming-Ming
authors.initials: MM
authors.lastname: Gao
authors.forename: Shu-Guang
authors.initials: SG
authors.lastname: Wang
mesh_terms: D000332:Aerobiosis; D017404:In Situ Hybridization, Fluorescence; D008280:Magnetics; D058465:Nitrification; D013050:Spectrometry, Fluorescence