Senzia, M. A.Mayo, Aloyce W.Mbwette, T. S. A.Katima, JamiduJørgensen, S. E.2016-05-242016-05-242002Senzia, M.A., Mayo, A.W., Mbwette, T.S.A., Katima, J.H.Y. and Jørgensen, S.E., 2002. Modelling nitrogen transformation and removal in primary facultative ponds. Ecological Modelling, 154(3), pp.207-215.http://hdl.handle.net/20.500.11810/2230Full text can be accessed at http://www.sciencedirect.com/science/article/pii/S0304380002000182This paper presents a dynamic rational model for nitrogen transformation in primary facultative ponds. The results show that, the dominant mechanism for nitrogen removal was sedimentation of organic nitrogen (9.7%). The major nitrogen transformation route was through mineralization (19.2%) followed by ammonia uptake by microorganisms (17.4%) and nitrification (2.4%). Denitrification process was another possible route for removal of nitrogen (4.1%), but volatilisation played a negligible role (0.1%). Approximately 38.8% of nitrogen flowing to primary facultative pond did not undergo any transformation. It was further found out that 8.3% of influent nitrogen was unaccounted for, which might be lost through seepage to the ground or evaporation. Nitrogen contained in microorganisms accounted for 50% of the total nitrogen in the final effluent.enNitrogen transformationNitrogen removalModellingPrimary facultative pondJournal Article10.1016/S0304-3800(02)00018-2