Abstract: This paper studied the removal effects of NH₄⁺-N,NO₃^--N,TN and TP by the integrated subsurface flow-upward vertical flow constructed wetland process.When the treatment loading was 30 L·d^-1 and the calculated hydraulic retention time (HRT) was 4.8 days,the process had good removals of NH₄⁺-N,NO₃^--N,TN and TP,and the average removals were 95%,52%,79%,81%,respectively.According to the operating time,the removal efficiency of the three nitrides could be divided into two phases,with the corresponding removals of NH₄⁺-N,NO₃^--N,TN being 93% and 99%,35% and 98%,and 71% and 98%,respectively,while the removal efficiency of TP was kept stable during the experiment.

Key words: Vegetation coverage, Ridge estimation, Quantitative estimation, RS, GIS