Effects of Magnetic Field on Structure and Enzyme Activity of Short-range Nitrification Microbial Community
To explore the influence mechanism of magnetic induction intensity on the short-range nitrification system,magnetic sequencing batch activated sludge method short-range nitrification reactors were constructed,effect laws of mag-netic induction intensity on nitrogen conversion in short-range nitrification process were compared,and effects of magnetic field on structure and enzyme activity of microbial community was researched by using molecular biology technology such as high-throughput sequencing.The results show that the magnetic field has significant effects on the short-range nitrifica-tion process,under the action of magnetic field with the magnetic induction intensity of 10 mT and 15 mT,the removal rate of ammonia nitrogen is lower than that of the control group without magnetic field.Under the action of magnetic field with the magnetic induction intensity of 5 mT and 10 mT,the nitrous nitrogen accumulative rate of the constructed reac-tors is higher than that of the control group without magnetic field.The magnetic field affects the microbial community structure and the relative content of enzyme genes in the constructed reactors.When the magnetic induction intensity is 5 mT,the relative abundances of OLB8 flora and nitrite oxidase decrease,the relative abundances of ammonia monooxy-genase and hydroxylamine dehydrogenase increase,and the nitrous nitrogen accumulation effect is better.
magnetic fieldshort-range nitrificationmicrobial communityenzyme activityinfluence mechanism
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