The development of vertical flow constructed wetlands treating raw wastewater in France has proved to be very successful over the last 20 years. In view of this a survey was carried out on more than 80 plants in order to study their performance and correct the design if necessary. This study shows that such systems perform well in terms of respecting the goals of both low level outlet COD and SS and nitrification.
MOLLE, P. ; LIENHARD, A. ; BOUTIN, C. ; MERLIN, G. ; IWEMA, A. (2005): How to Treat Raw Sewage with Constructed Wetlands: An Overview of the French Systems. In: Water Science and Technology: Volume 51 , 11-21. URL [Accessed: 26.03.2015]