新建组合填料潜流湿地脱氮除磷研究

Studies on nitrogen and phosphorus removal in new combined substrate subsurface constructed wetlands

以城市污水ANOXIC—OXIC工艺出水为处理对象，在中试规模上研究了新建组合填料潜流湿地的脱氮除磷效能。结果表明，当COD面积负荷率、TN面积负荷率、TP面积负荷率、HRT（水力停留时间）分别为8．7～22．1g／（m^2·d）、7．29～24．28g／（m^·-d）、0．94—1．84g/（m^2·d）、0．48—0．59d时，①湿地启动阶段，COD去除率为30．3％、面积负荷去除率为6．63g／（m^2·d）、反应动力学常数为0．23m／d；SS去除率为45．5％；氨态氮、亚硝态氮和硝态氮的去除率分别为9．3％、40．0％和25．0％；TN去除率为14．9％、面积负荷去除率3．63g／（m^2·-d）、反应动力学常数为0．10m／d；TP去除率为92．4％、面积负荷去除率为0．93g／（m^2·-d），反应动力学常数为O．94m／d。②稳态运行阶段，COD去除率为33．9％，面积负荷去除率为2．98g／（／m^2·d），反应动力学常数为0．24m／d；SS去除率为50．0％；氨氮、亚硝氮和硝氮的去除率分别为50．2％、41．9％和24．7％；TN去除率为29．9％，面积负荷去除率为2．19g／（m^2·d），反应动力学常数为0．18m／d。TP去除率为90．5％、面积负荷去除率为0．89g,／（m^2·d）、反应动力学常数为0．86m／d。③随TN面积负荷增加，TN面积负荷去除率和TN动力学常数均随之线性增加；随TP面积负荷增加，TP面积负荷去除率随之线性增加，而反应动力学常数呈幂函数增加。

Effluent of urban wastewater treatment plant operated under ANOXIC-OXIC process was treated by new combined substrate subsurface constructed wetlands in pilot-scale for studying efficiency of nitrogen and phosphorus removal. Results indicate that, when COD area load rate, TN area load rate, TP area load rate and hydraulic retention time （HRT） are 8.7-22.1 g/（m^2 · d）, 7.29-24.28 g/（m^2· d）, 0.94- 1.84 g/（m^2· d） and O. 48 -0.59 d respectively, （1）during start-up periods, coD removal efficiency, area load removal rate and removal kinetic constant are 30.3%, 6.63 g/（ m^2· d） and 0. 23 m/d respectively. SS removal efficiency is 45.5 %. Removal efficiency of ammonium nitrogen, nitrite nitrogen and nitrate nitrogen are 9.3%, 40.0% and 25.0% respectively. Removal efficiency, area load removal rate and removal kinetic constant of total nitrogen are 14.9% , 3.63 g/（ m^2· d） and 0.10m/d respectively. Removal efficiency, area load removal rate and removal kinetic constant of total phosphorus are 92.4%, 0.93 g/（ m^2 · d） and 0.94m/ d respectively. （2）during stationary state periods, COD removal efficiency, area load removal rate and removal kinetic constant are 33.9% , 2.98 g/（m^2 · d） and 0.24m/d respectively. SS removal efficiency is 50.0%. Removal efficiency of ammonium nitrogen, nitrite nitrogen and nitrate nitrogen are 50.2%, 41.9% and 24.7% respectively. Removal efficiency, area load removal rate and removal kinetic constant of total nitrogen are 29.9% , 2.19 g/（m^2 · d） and 0.18m/d respectively. Removal efficiency, area load removal rate and removal kinetic constant of total phosphous are 90.5%, 0.89 g/（m^2 · d） and 0.86m/d respectively. （3）TN area load removal rate and removal kinetic constant are linearly increased with the increase of total nitrogen area load rate. TP area load removal rate is linearly increased with the increase of total phosphorus area load rate, but TP removal kinetic constant increases according to exponential function along with increase of total phosphorus area load rate.