The wastewater from rural areas or small agglomerations usually discharged in an unsuitable manner requires an appropriate treatment. The constructed wetland has revealed a great potential due to the good performance, reasonable investment and easier management. The aim of the paper is to evaluate the impact of the flow rate on purification performance of vertical bed planted by the Papyrus Cyperus during the first year of operating. Investigations were carried out on a vertical filter of 12 m2 filled with a 15 cm top layer of gravel (2/4mm). Results shows that the flow rate can affect the purification performances. For the flow rate of 0,3 l/s we ensured a good reduction of COD (79 %), of the BOD5 (80%) as well as MES (78%). However, a higher flow rate (8 l/s) conduct to a low performance (42%, 48% and 49% for COD, BOD5 and SS respectively).
Volume 11 | 11-Special Issue