Gomezulu, Edwin Sifuel2019-12-092020-01-072019-12-092020-01-072008Gomezulu, E.S.(2008) Assessment of Nitrogen Nutrients removal efficiency in constructed mangrove wetlands, Master dissertation, University of Dar es Salaam. Dar es Salaam.http://localhost:8080/xmlui/handle/123456789/427Available in print form, East Africana Collection, Dr. Wilbert Chagula Library, Class mark (THS EAF TD746.G65)A study was conducted to assess the efficiency of a constructed mangrove wetland in removing nitrogen nutrients from sewage. The constructed wetland was built at Kunduchi near Belinda Hotel in Dar es Salaam. The sewage from the hotel was conveyed to the site through a pipe. There were initial experiments which were conducted in bare cells which aimed at optimizing the sewage loadings which could have been used in the planted cells. No significant difference in nitrogen nutrients removal was observed between the different sewage loadings used and therefore the sewage loadings used in the planted cells were chosen just to ensure that there was sufficient difference between the dosing ratios. So the sewage dosing ratios chosen were 0, 20, 40 and 60 % compared to 10, 20 and 30 % which were used in the bare cells; Wastewater samples were analyzed for ammonia nitrogen, nitrate nitrogen and organic nitrogen. Planted cells were found to be more efficient in removing nitrogen nutrients than the non-planted cells. However the cells with Rhizophora mucronata were found to be more efficient in removing nitrogen nutrients than Avicennia marina cells. The cells that were loaded with 60 % sewage removed nitrogen nutrients than the cells which were loaded with 0 % sewage. With respect to dosing ratios, it was concluded that the higher sewage dosing ratios were more appropriate in nitrogen nutrients removal than the low sewage dosing ratios.enSewagePurificationNitrogen removalConstructed wetlandsThesis