Browsing by Author "Titus, Athanas Haule"

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    The study of potential indigenous macrophytes for Nitrogen and faecal coliform removal from Domestic wastewater in horizontal subsurface flow constructed wetlands in Tanzania
    (University of Dar es Salaam, 2003) Titus, Athanas Haule
    Removal of ammonia and nitrate N by macrophytes in the subsurface flow constructed wetlands receiving waste stabilisation pond effluent was investigated at the University of Dar es Salaam (UDSM), Tanzania Seven parallel horizontal subsurface flow constructed wetland (HSSFCW) cells each packed with gravels of 8 to 25 mm diameter and planted with a monoculture macrophyte species were installed downstream the last maturation pond of waste stabilisation pond system The main aim was to study the efficiency of each macrophyte in ammonia and nitrate N removal. Data from P. mauritianus was used to develop a mathematical model to predict ammonia and nitrate N concentration in the wetlands by a given macrophyte. Among the six macrophytes planted in the wetlands, NH3-N removal was the highest 91 63% in the K. erectus dominated wetland , while the minimum was 58 91% in the C. dubius dominated wetland. Removals in other wetlands were, 90.26% for T. domingensis; 89.3 1% for T. capensis, 88.55% for P. mauritiunus, 74 37% for control wetland and 43.75% for C. grandis. Furthermore control wetland had the highest N03-N removal efficiency of 87.55%. On the other hand, 03-N removal in the Kyllinga erect11s dominated wetland was 79.41%, T. dommgensis, 79.48%, T. capensis, 80.84%; P. mauritiunus, 78 31%, C dubius 80 45% and C grand1s 78.41%. Faecal coliform removal was highest in K. erectus dominated wetland, which was 98.22%, T. capensis 92.9%: T. domingensis 91 .9%; C dubius 91 78%; P. mauritianus 89.43%; C. grandis 73.86% and control wetland 48 13%. Logically. It can be said that macrophytes ' that bioaccumulation more N are also potential for N removal from wetlands, however there are also other qualities for better performance such as provision of larger surface area for microorganisms to attach and grow