摘要: The first experiments using wetland macrophytes for wastewater treatment were carried out in Germany the early 1950s. Since then, constructed wetlands have evolved into a reliable technology various types of wastewater. classification is based on: vegetation type (emergent, submerged, floating leaved, free-floating); hydrology (free water surface and subsurface flow); flow can be further classified according to direction (vertical or horizontal). In order achieve better performance, namely nitrogen, could combined hybrid systems.