EN
The removal of the nutrients: different forms of nitrogen, phosphorus and carbon, by two constructed wetland systems with reed (Phragmites australis) was investigated between the spring 2000 and the summer 2001. Two systems: reed pond with surface flow and sand reed bed with subsurface flow, have been compared Both the systems show high performance wastewater purification during whole vegetation season. Higher removal of nitrogen forms and organic carbon was observed in the reed bed with subsurface flows. This can be caused by higher biomass and density of plants than that, in reed pond with surface flow. The content of phosphorus in both systems significantly increased.