[hal-01078368] Performance evaluation of partially saturated vertical-flow constructed wetland with trickling filter and chemical precipitationfor domestic and winery wastewaters treatment

The use of Vertical Flow Constructed Wetlands VFCW is growing rapidly in Europe for domestic wastewater treatment in small communities In order to improve denitrification and dephosphatation as compared to classical VFCW the Azoé-NP® process has been developed The process line consists of a biological aerobic trickling filter as a primary treatment stage ferric chloride FeCl3 addition for phosphorus P treatment and two stages of partially saturated VFCW A municipal wastewater treatment plant using Azoé-NP® process has been monitored during eight years through 44 campaigns of 24h time-proportional inlet-outlet sampling followed by analyses of TSS BOD5 COD TKN NO3 N and TP concentrations The results revealed good performances of the overall treatment To better characterize the performance of each treatment step five additional 24h monitoring campaigns were performed with samples taken from four different points along the treatment line Results showed a good performance in dissolved carbon removal and nitrification by the trickling filter The main part of the treatment was found to be done by filtration throughout the first filtration stage Nitrate removal was achieved principally at the second filtration stage Phosphorus migration through the first stage and its slight retention at the second stage was observed



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