Purification efficiency of constructed wetland system on nitrogen and phosphorus

Constructed wetland is a new wastewater treatment process.The purification efficiency of constructed wetland on nitrogen and phosphorus was analyzed by the constructed wetland wastewater system in Hunnan new district of Shenyang.The purification mechanisms of the vertical flow wetland system and the free surface flow wetland system on nitrogen and phosphorus were discussed.The results show that the vertical flow wetland system can remove the total nitrogen to some extent,but instable.The removal rates of NH+4—N and the total phosphorus are better,and they are 97.75% and 81.03%,respectively.The purification efficiency of the surface flow wetland system on the total nitrogen is influenced by temperature,and those of wetland plants on nitrogen and phosphorus are influenced by the environment and seasons.