Enhanced anammox consortium activity for nitrogen removal: impacts of static magnetic field.
Anaerobic ammonium oxidation (anammox) process has been becoming a promising technology for the removal of nitrogenous contaminants from wastewater. In short-term batch tests, we observed the anaerobic ammonium oxidizing activity of anammox consortium increased as the magnetic field varied in the range of 16.8-95.0mT. A maximum 50% increase was obtained at the value of 75.0mT. In order to study long-term effect of magnetic field on anammox consortium, an anammox reactor with magnetic field of 60.0mT was operated in laboratory-scale. The results demonstrated that a significant 30% increase in maximum nitrogen removal rate and an approximate 1/4 saving in cultivation time were achieved by using the magnetic system. Microbiological composition analysis showed that bacterial diversity in the reactor decreased under magnetic-exposed condition. Nevertheless, some strains belonging to Planctomycetales were highly enriched. These findings indicated that the magnetic field was useful and reliable for fast start-up of anammox process since it was proved as a simple and convenient approach to enhance anaerobic ammonium oxidizing activity.
Liu
Sitong
S
Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, PR China.
Yang
Fenglin
F
Meng
Fangang
F
Chen
Huihui
H
Gong
Zheng
Z
D000641:Ammonia / Q000378:metabolism*; D000693:Anaerobiosis; D001419:Bacteria / Q000145:classification / Q000235:genetics; D019149:Bioreactors / Q000382:microbiology; D008280:Magnetics; D009584:Nitrogen / Q000378:metabolism*; D010084:Oxidation-Reduction; D016133:Polymerase Chain Reaction; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D013997:Time Factors
D012336:RNA, Ribosomal, 16S; D000641:Ammonia; D009584:Nitrogen