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Effect of Magnetic System in SBR Denitrification and the Microbial Comunnity Dynamic Analysis

Author: DanJun
Tutor: YangJiXian；MaFang
School: Harbin Institute of Technology
Course: Microbiology
Keywords: Biological denitrification Aerobic denitrifiers Magnetic field DGGE
CLC: X52
Type: Master's thesis
Year: 2010
Downloads: 71
Quote: 0
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Abstract


Along with industrial development and urbanization, water eutrophication problem gradually highlight how the removal of nitrogen pollution became a hot issue in today's water pollution control field. Traditional biological nitrogen removal process to play its traditional strengths while also exist many problems, and therefore to carry out the study of the theory and technology of the new biological nitrogen removal is imminent. The use of magnetic field-assisted degradation of pollutants is a new water treatment technology, it can be used alone or can be used in conjunction with other water treatment technologies, and reduce pollutant degradation process energy consumption, easy operation, no secondary pollution costs and low, and has broad prospects for development. The research results show that the magnetic field of a certain strength, water pollutants COD, ammonia nitrogen, nitrate nitrogen removal rate increased, COD removal efficiency improved significantly when the magnetic field strength between 90 ~ 120mT When the magnetic flux density is between 30 ~ 60mT, promote the removal of the ammonia. Magnetic field is more obvious role of aerobic denitrification process, from the range of 0 ~ 150 mT, with increasing magnetic field strength, the nitrate removal efficiency also gradually rising trend. The impact factor of the magnetic-SBR composite system in SND. The results show that, in the temperature range of 20 ℃ ~ 30 ℃, the nitration efficiency and total nitrogen removal increases with increasing temperature. Reactor in the 30 ° C temperature run simultaneous nitrification and aerobic denitrification best; C / N 6:00, DO concentration of 1.2mg / L total nitrogen removal rate was 53.07%, when the DO concentration 4.0mg / L when the total nitrogen removal rate can be reached 45.06%. With the increase of DO concentration in the reactor SND simultaneous denitrification by denitrifying bacteria play a major role gradually evolved into the dual role of the hypoxic microenvironment and aerobic denitrifiers; DGGE fingerprinting technology, magnetic effect on the preliminary study of the impact of system microflora community structure succession. DGGE fingerprinting and cluster analysis show the richness of the control group compared with plus magnetic reactor microbial richness index, plus magnetic samples tend to be clustered into a bacterial bio-magnetic effect of lead to adaptation magnetic environment increased activity, rapid population succession useless flora of the poor magnetic appropriate system be eliminated, more obvious advantage flora, reduce the richness, relative to the control group is more likely to form a stable community structure.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control
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