EN
Landfills produce leachates, typically formed from infiltrating waters and the products of solid-waste decomposition. Those contaminated leachate waters are a potential threat to surface and subsurface receiving waters. The highly variable nature of solid waste, differences in age and decomposition, and the diversity of chemical and biological reactions that take place in landfill result in a wide range of chemical quality of leachates (Table I). Treatment leachates in conventional wastewater treatment plant is a costly procedure, requiring storage at the landfill site as well as transportation charges. Many potential contaminants in leachates can not treated by conventional processes. Trees plantation, short rotation coppice, with Populus and Salix can be utilised to treatment of leachate. Constructed wetland have been used successfully to treatment leachates. Subsurface and surface flow constructed wetlands treatment of landfill leachate have been successfully tested in many countries in cold- climate and warm-climate. Grasses - Phragmites australis, Phalaris arundinacea and Miscanthus x gigantheus are the most commonly used in constructed wetlands.