Abstract：In order to improve the denitrification function of anoxic tank, the internal recycle nitrating liquid of A / A / O system was loaded by electromagnetic wave. The effects of different loading percentages (5%, 10%, 20%) of nitrating liquid on the pollutant reduction function of A / A / O system were investigated when loading time was 75s, loading power was 100W and 400W respectively. Then we selected the first, third and sixth conditions and studied the changes of microbial characteristics and community structure of the mixed liquid in anoxic tank in the three conditions. The results showed that the internal recycle nitrating liquid loaded by electromagnetic wave could make the flocs of the nitrating liquid break up and organic matter dissolved out and were added to the anoxic tank, which will make denitrification bacteria (Dechloromonas, Azospira, Haliangium) concentrated. The results of RDA (redundancy analysis) showed that the increase of electromagnetic wave loading power would enrich a large amount of Dechloromonas in the anoxic tank and the denitrification rate of anoxic tank sludge improved greatly. When the loading condition of electromagnetic wave was P=100W, T=75s, L=10%, the specific nitrite reduction rate (SNIRR) and specific nitrate reduction rate (SNRR) of anoxic sludge increased to (10.15±1.02) and (14.37±0.63)mg N/(g MLVSS×h)respectively, and it increased by 20.55% and 46.63% compared with no loading;When the loading conditions of electromagnetic wave was P=400W, T=75s, L=10%, the sludge SNIRR and SNRR increased by 25.53% and 28.03%, and it increased by (10.57 ±0.82) and (12.16 ±0.74)mg N/(g MLVSS·h) compared with unloading, the results showed that the denitrification function of anoxic tank of A/A/O can be improved by loading the internal reflux nitrification solution with electromagnetic wave.
桑稳姣, 李强, 贾丹妮, 汪晨, 张倩, 金溪, 张世羊, 李翠华. 电磁波加载内回流硝化液对A/A/O缺氧池反硝化功能的影响[J]. 中国环境科学, 2021, 41(12): 5602-5612.
SANG Wen-jiao, LI Qiang, JIA Dan-ni, WANG Chen, ZHANG Qian, JIN Xi, ZHANG Shi-yang, LI Cui-hua. Effect of electromagnetic wave loading internal reflux nitrification liquid on denitrification function of A / A / O anoxic tank. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(12): 5602-5612.
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