Nitrogen management in reservoir catchments through constructed wetland systems

• Published in: Water Science & Technology Vol. 51; no. 11; pp. 175 - 181
• Main Authors: Tunçiper, B, Ayaz, S C, Akça, L, Samsunlu, A
• Format: Journal Article Conference Proceeding
• Language: English
• Published: England IWA Publishing 01.01.2005
• Subjects: Ammonification; Aquatic plants; Artificial wetlands; Canna; Catchment area; Catchments; Continuous flow; Cyperus; Denitrification; Egeria; Elodea; Floating structures; Freshwater plants; Iris; Juncus; Kinetics; Lemna; Magnoliopsida - metabolism; Marshes; Models, Statistical; Nitrification; Nitrogen - isolation & purification; Nitrogen - metabolism; Nitrogen removal; Paspalum; Phosphorus - isolation & purification; Phosphorus - metabolism; Phragmites; Pistia; Plug flow; Poaceae; Regression Analysis; Removal; Reservoir management; Reservoirs; Surface flow; Turkey; Typhia; Waste Disposal, Fluid - methods; Wastewater; Water Movements; Water Pollutants, Chemical - isolation & purification; Water Pollutants, Chemical - metabolism; Water reservoirs; Water Supply; Wetlands; Turkey, Istanbul; Turkey; Turkey, Gebze
• ISSN: 0273-1223; 1996-9732
• DOI: 10.2166/wst.2005.0404

In this study, nitrogen removal was investigated in pilot-scale subsurface flow (SSF) and in free water surface flow (FWS) constructed wetlands installed in the campus of TUBITAK-Marmara Research Center, Gebze, near Istanbul, Turkey. The main purposes of this study are to apply constructed wetlands for the protection of water reservoirs and to reuse wastewater. Experiments were carried out at continuous flow reactors. The effects of the type of plants on the removal were investigated by using emergent (Canna, Cyperus, Typhia spp., Phragmites spp., Juncus, Poaceae, Paspalum and Iris.), submerged (Elodea, Egeria) and floating (Pistia, Salvina and Lemna) marsh plants at different conditions. During the study period HLRs were 30, 50, 70, 80 and 120 L m(2)d(-1) respectively. The average annual NH4-N, NO(3)-N, organic N and TN treatment efficiencies in SSF and FWS wetlands are 81% and 68%, 37% and 49%, 75% and 68%, 47% and 53%, respectively. Nitrification, denitrification and ammonification rate constant (k20) values in SSF and FNS systems have been found as 0.898 d(-1) and 0.541 d(-1), 0.488 d(-1) and 0.502 d(-1), 0.986 d(-1) and 0.908 respectively. Two types of the models (first-order plug flow and multiple regression) were tried to estimate the system performances.