The effect of magnetic field on the performance of AAO process was studied by placing AAO reactor in an average magnetic field environment of 5 mT,and mechanism of its effect was preliminarily explored from the perspective of molecular biology.The results showed that under a magnetic field environment of 5 mT,the average total nitrogen removal rate in start-up stage of AAO process was significantly improved,with an increase of 6%compared to the control group;and start-up time of AAO reactor was shortened by 5 days compared with control group.The relative abundance of denitrifying bacteria represented by Azospira in AAO was significantly increased,relative abundance of Thiothrix was greatly reduced,and inhibitory effect on sludge bulking was obvious.Through gene function prediction found that relative abundance of cell movement genes in magnetic environment increased by 75%compared with that in control group,and membrane transport genes decreased significantly,thereby startup speed and denitrification efficiency of AAO were significantly improved.
关键词
磁场/AAO工艺/生物脱氮/群落结构/功能基因预测
Key words
magnetic field/AAO process/biological nitrogen removal/microflora structure/functional gene prediction
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