复合垂直流与潜流人工湿地沿程脱氮除磷对比研究

针对复合垂直流和潜流人工湿地对COD、TP、NH_4~+-N、NO~3~--N和TN的沿程去除规律进行了对比研究.结果表明,夏季复合垂直流人工湿地的去除效果均好于潜流人工湿地.对于复合垂直流人工湿地,污染物的去除主要集中在下行流池,且在进水端0～20 cm对COD、TP、NH_4~+-N和TN都有快速降解的过程.对于潜流人工湿地,进水端0～40 cm主要是COD和TP的快速降解沉淀,之后硝化作用逐渐加强,潜流人工湿地沿程均会发生反硝化作用,TN浓度基本呈均匀下降趋势.

Purified efficiency of nitrogen and phosphate through two types of constructed wetlands

Integrated Vertical Flow Constructed Wetland (IVCW) and Subsurface Flow Constructed Wetland (SSFW) with the hydraulic loading of 600 mm/d were built to treat domestic wastewater. The removal efficiency of COD, TP, NH~4~+-N,NO_3~--N and TN through the two constructed wetlands were detected and compared. The results showed that IVCW was more effective than SSFW in water purified, both of IVCW and SSFW presented better effi-ciency in summer than in winter. The IVCW system provided a suitable eeology environment for maintaining the mi-croorganisim, the degradation of COD, TP, NH_4~+-N and TN were mainly in the front of the system The removal of COD and TP in SSFW were observed in 0-40 cm of the constructed wetlands for the deposition and adsorption of sus-pend granules in wastewater, and then nitrification was intensified gradually in the middle stage, denitrification exis-ted all through the process of constructed wetland due to the anoxic environment, which induced a equably TN reduc-tion in SSFW.