复合人工湿地对高污染性河流营养物的去除

为了研究复合人工湿地对高污染性河流营养物的去除效果，在西安皂河人渭处建立了一座占地约13334m。包括5组不同复合人工湿地工艺的中试系统。经过1年的实验研究表明，复合型人工湿地对COD、BOD。和ss有很好的去除效果，其去除率最高分别为（82．4±7．2）％、（97．1±1．7）％和（94±2．7）％，对于脱氮除磷而言，以水力停留时间4．1d的复合湿地系列4的处理效果最佳，对TN、NH3-N和TP的年去除率达（79．4±14）％、（79．2±13．7）％和（82．3±12）％。氮的去除效果受温度季节性变化影响较大，夏季平均水温高于19℃有更好的处理效果，磷的去除效果受温度影响不大；NO2-、NO3-去除率呈现负增长，在湿地尾端出现了不同程度的积累。

Nutrient removal in hybrid constructed wetlands for treating highly polluted river water

In order to study the nutrient removal efficiencies in hybrid constructed wetlands（CWs） for trea- ting highly polluted river water, a Meso scale CWs system of about 13000 m2which includes 5 different hybrid CWs was constructed along the coast of Zaohe River. According to one year＇ s operation and study, the results showed that hybrid CWs had dramatic removal efficiencies of COD, BOD5and SS, the maximum removal rates were （82.4 ± 7.2） % , （97.1 ± 1.7） % and （94 ± 2.7 ） % , respectively. For the removal of nitrogen and phos- phorus, the hybrid CWs series 4 which under the hydraulic retention time of 4. 1 d revealed that the best removal potential, the maximum TN, NH3-N and TP removal efficiencies were （79.4 ± 14.0）% , （79.2 ± 13.7）% and （82.3 ± 12.0） % , respectively. Temperature seasonal changes seriously affect the removal rate of nitrogen, when the average temperature is higher than 190C in summer, the CW systems have better removal efficiencies. The temperature effect for phosphorus removal is not obvious. NO2- , NO3- presented negative growth, and ap- peared different degrees of accumulation in the trail of the wetlands.