不同含量低污染水对人工湿地中细菌的影响研究

Effects of Different Pollutant Content in Low Polluted Water on Bacterial in Constructed Wetland

探究水平流人工湿地(HFCW)系统处理低污染水过程中,相同COD/ρ(TN)下不同碳氮含量对细菌群落结构的影响。结果表明,进水为较高碳氮含量的HFCW(HF1)和进水为较低碳氮含量的HFCW(HF2)对COD和TN的去除效率具有一定的差异,HF1和HF2对COD的去除效率分别为48.26%和28.89%,对TN的去除率分别为79.06%和81.87%。HF1中细菌的丰富度和多样性均高于HF2,HF1中富集的优势细菌为Chloroflexaceae、Comamonadaceae和Rhodocyclaceae,均具有异养反硝化功能,HF2中富集的优势细菌为Xanthomonadaceae和Rhodocyclaceae,其中Xanthomonadaceae具有自养反硝化功能。COD、NH4^+-N和NO3^--N对HF1中细菌群落的影响大于对HF2中细菌群落的影响,HF1中COD对细菌群落的影响大于NH4^+-N和NO3^--N。

In a horizontal flow constructed wetland(HFCW)for low pollutant water treatment process,the effect of different content of pollutants under the same COD/ρ(TN)on the structure of bacterial community was explored.The results indicated that the HF1 with higher pollution influent and HF2 with lower pollution influent had some differences in COD and TN removal efficiency,the removal efficiency of COD by HF1 and HF2 was 48.26%and28.89%respectively,the removal efficiencies of TN by HF1 and HF2 was 79.06%and 81.87%respectively.The richness and diversity of the bacteria in HF1 were higher than in the HF2.The dominant bacteria in HF1 were Chloroflexaceae,Comamonadaceae and Rhodocyclaceae,which had the heterotrophic denitrification function.The dominant bacteria in HF2 were Xanthomonadaceae and Rhodocyclaceae,and the Xanthomonadaceae had the autotrophic denitrification function.The effect of COD,NH4^+-N and NO3^--N on the bacterial community in HF1 was greater than that in HF2,and the effect of COD on bacterial community in HF1 was higher than NH4^+-N and NO3^--N.