The denitrification efficiency of the new effluent in zin conference centre constructed wetland

Wetland is a natural system of water treatment. It has been used as waste water treatment system in many countries in Europe. The vertical flow constructed wetland of different water level are efficient in removing Nutrients, TSS, heavy metals and toxic compounds from waste water. Nutrients are effectively removed from domestic wastes through microbial nitrification-denitrification path way. Excess nitrogen in water bodies are the major causes of Eutrophication. The aim of this study is to optimize the nitrogen removal efficiency of vertical flow wetland using different water levels from Zin conference centre wetlands. The samples were collected from influents and two effluents- old and new for COD, BOD, NH4-N, NO3-N, TKN and TN analysis. The data were analyzed using SPSS to see the significance between factors. Results showed that the average NO3-N in the effluent is 0,17+ 0,23 mg/L but in the old and new effluents are 55+12,3 mg/L and 46,5+12,7 mg/L respectively. The NH4-N concentration was significantly decreased from influent 62,8 + 17 mg/L to effluents 0,21+ 0,2 mg/L and 2,75+ 4,6 mg/L in the old and new effluents respectively. The COD concentration was significantly decrease from 379+130 mg/L in the influent to 38+11,7 mg/L and 35,3+22,0 mg/L in the old and new effluent respectively. The shortage of COD in the effluent affects the denitrification and nitrification processes in the wetland. Keywords: Key words: Domestic wastewater, Microbial Nitrification-denitrification, Water levels, Nitrogen removal efficiency, Eutrophication