Purification effect of wetland sediment environment on different concentrations wastewater
湿地底质环境对不同浓度污水的净化效果

The experiment,simulating the surface flow wetland system with Zhalong wetland sediment as medium,studies the influence of various sediments and influent concentrations on purification efficiency and stability of the surface flow wetland.By means of the comprehensive analysis of removal rate mean,coefficient of variation and variance,the experimental results showed that among three different concentration gradients,the higher the influent concentration,the better purification efficiency of the wetland sediment.On the other hand,clay for TN,NO-3-N and the silt soil for NH+4-N,COD are better on the removal efficiency.By contrast,three sediments have no significant difference on the removal of phosphorus.In addition,with the different influent concentrations,the effect of sediment factors also changes accordingly.The influence for the removal rate of Clay and silt soil by the influent concentration is larger,while the sandy loam is relatively stable.The results objectively reflect the water purification function of different sediments in Zhalong wetland and provide the theoretical basis for the surface flow constructed wetland purification of different concentrations wastewater and the selection of wetland sediment with the best purification effect.