复合垂直流湿地去除模拟河水中氮磷的研究

构建无植物复合垂直流湿地系统，用于处理太湖梅梁湾模拟入湖河水，湿地以不同粒径的沸石为基质，以便于微生物的挂膜和氮的吸附。该系统为期5个月的氮、磷去除效果表明，在水力负荷为0.375 m³/(m²•d)，进水NH₃-N,NO₂^--N,TN和TP浓度分别为3.8~5.1，0.9~1.8，6.6~8.5和0.32~0.47 mg/L时，NH₃-N,NO₂^--N,TN和TP的平均去除率分别为97.5%，95.5%，26.6%和18.9%；系统中N的去除主要依靠硝化反硝化作用，由于系统中缺乏碳源，抑制了反硝化过程，使硝化作用强于反硝化作用，导致出水NO₃^--N浓度升高，且出水中的NO₃^--N浓度约占TN的96.7%。

Study of Nitrogen and Phosphorus Removal from Simulated River Water by Integrated Vertical Flow Wetland

An unplanted and integrated vertical-flow wetland was constructed for research to treat the simulated water of rivers flowing into Meiliang Bay of Taihu Lake. A variety of zeolites with different particle sizes were applied to this wetland, in order to promote biofilm and nitrogen adsorption on the zeolites. The results from five-month operation indicated that, when the hydraulic loading was 0.375 m3/(m2•d) and influent concentrations of NH3-N, NO2--N, TN and TP were 3.8-5.1, 0.9-1.8, 6.6-8.5 and 0.32-0.47 mg/L, the corresponding average removal rates were 97.5%, 95.5%, 26.6% and 18.9%, respectively. The nitrogen removal rate mainly depended on the nitrification and denitrification in the system. Due to lack of carbon source in the system, the denitrification process was strongly inhibited, and the denitrification was stronger than the nitrification, thus resulting in the increased NO3--N level in effluent, which accounted for 96.7% of TN in effluent.