宽叶香蒲表面流人工湿地脱氮除磷效果研究

Removal of nitrogen and phosphorus by free water surface constructed wetland planted with Typha latifolia

以运行A／O工艺的生化反应器出水为处理对象，在中试规模上研究了宽叶香蒲表面流人工湿地的脱氮除磷效果及影响因素。结果表明，在工况Ⅰ条件下，COD去除率为43．2％，COD面积负荷去除率为4．79g／（m^2·d），COD面积负荷去除率常数为0．18m／d，SS、NH4^＋—N和NO3^--N的去除率分别为41．2％、9．4％、3．4％，TN去除率为11．8％，TN面积负荷去除率为1．36g／（m^2·d），TN面积负荷去除率常数为0．04m／d，TP去除率为30．1％，TP面积负荷去除率为0．29g／（m^2·d），TP面积负荷去除率常数为0．13m／d；在工况Ⅱ条件下，COD去除率为18．7％，COD面积负荷去除率为1．19g／（m^2·d），COD面积负荷去除率常数为0．06m／d，SS、NHT—N、NO2^-—N、NO3^--N的去除率分别为31．6％、29．8％、65．0％、29．2％，TN去除率为31．4％，TN面积负荷去除率为2．33g／（m^2·d）．TN面积负荷去除率常数为0．12m／d，TP去除率为29．4％，TP面积负荷去除率为0．22g／（m^2·d），TP面积负荷去除率常数为0．11m／d。在COD面积负荷去除率、TN面积负荷去除率、TP面积负荷去除率分别为4．90～9．80、2．76～8．83、0．57～1．39g／（m^2·d），水力停留时间（HRT）为0．4～1．1d条件下，随HRT、水温、（NO2^-—N＋NO3^--N）／TN的增加，表面流人工湿地的TN面积负荷去除率线性增加。

Free water surface constructed wetland planted with Typha latifolia was employed to treat effluent from biochemical reactor under A/O process. The removal efficiency of nitrogen and phosphorus of the wetland sys tern were investigated. The treatment effects of the free water surface constructed wetland under two conditions were presented in the paper. The effect of hydraulic retention time （HRT）, water temperature and content of oxidation state nitrogen on total nitrogen （TN） area loading removal rate was studied. When COD area loading rate was 4.90- 9.80 g/（m^2·d）, TN area loading rate was 2.76-8.83 g/（m^2·d）, TP area loading rate was 0.57 1.39 g/（m^2·d）, hydraulic retention time was 0.4-1.1 d, TN area loading removal rate was linearly increased with increasing of HRT, water temperature and （NO2^-N＋ NO3^--N）/TN ratio. The different mechanisms and favorable conditions for treatment of different types of wastewater by wetland system were discussed in the final.