Browsing by Author "Oryem–Origa, H."
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- ItemHeavy metal assessment and water quality values in urban stream and rain water(IRSEN, CEERS, IAU, 2010) Sekabira, K; Oryem–Origa, H.; Basamba, T. A; Mutumba, G.; Kakudidi, EWater quality monitoring in developing countries is inadequate, especially in stream water affected by urban effluents and runoff. The purpose of this study was to investigate heavy metal contaminants in the Nakivubo Stream water in Kampala, Uganda. Water samples Nakivubo Channelized Stream, tributaries and industrial effluents that drain into the stream were collected and analysed for the total elemental concentration using flame atomic absorption spectrophotometer. The results showed that: 1) the wastewater was highly enriched with lead and manganese above the maximum permissible limit; 2) the levels of dissolved oxygen were below the maximum permissible limit, while the biological oxygen demand was above the maximum permissible limit. All industrial effluents/wastewater were classified as strong (> 220 mg/L). Factor analysis results reveal two sources of pollutants; 1) mixed origin or chemical phenomena of industrial and vehicular emissions and 2) multiple origin of lead (vehicular, commercial establishment and industrial). In conclusion, Nakivubo Channelized Stream water is not enriched with heavy metals. These heavy metals (lead, cadmium and zinc) were rapidly removed by co-precipitation with manganese and iron hydroxides and total dissolved solids into stream sediments. This phenomena is controlled by pH in water.
- ItemHeavy metal phytoremediation by Commelina benghalensis (L) and Cynodon dactylon (L) growing in Urban stream sediments(Academic Journals, 2011) Sekabira, K.; Oryem–Origa, H.; Mutumba, G.B; Basamba, T.A.Urbanisation and industrialization lead to heavy metal pollution in the Nakivubo drainage ecosystem. The objectives of this study were to determine heavy metal concentrations and distribution in Commelina benghalensis (L.) and Cynodon dactylon (L.) that grows in different polluted sites along the urban stream sediments of the Nakivubo drainage ecosystem in Kampala, Uganda. To investigate the possibility of using these plant species in phytoextraction and phytostabilisation of heavy metal pollutants, assessment of heavy metals was done using flame atomic absorption spectrophotometer. Bioaccumulation factor and translocation factor values (BAF and TF > 1) for both plant species were greater than one for Cu at some sites suggesting efficient accumulation in the shoot. BAF > 1 and TF < 1 values for Pb, Cd and Zn suggest accumulation in roots and qualify these plants also as good candidates for phytostabilisation. In conclusion, the heavy metal sequestration from urban stream sediments by plant parts that are harvestable are characterized and recommended as good candidates for phytoremediation (phytoextraction and phytostabilisation) and can be used as indicators of heavy metal pollution for the urban stream ecosystem