Floating wetlands consist on a water matrix in which emergent plants grow along the surface. The upper parts of the plants grow above the water level while the roots extend down in the water matrix playing a crucial role on nutrient and organic matter uptake. Roots provide surface and nutrients for the growth of bacterial biofilms which develop biochemical process such as nitrification/denitrification. This natural system performs wastewater treatment by the addition of wastewater to the liquid matrix.
These systems can be an alternative or a better option to CW, as they need less surface and can avoid the problem of clogging. PROJAR, has already adjusted the floating capacity and found the best-adapted vegetation. Now it is necessary to be tested in a greater scale to validate the constants of the model employed for its design.
The newest advance will be the implementation of a solar driven aeration system to increase the oxygen content in the water column and improve the hydraulics, thus enhancing its general performance.