Institute of Development Studies
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Item Assessment of surface water quality near municipal solid waste dumping facility in Bukoba, Kagera Region, Tanzania(Wiley Online LIbrary, 2023) Lema, Meserecordias W. J.; Mwegoha, William J. S.Water samples were collected from River Kanoni which passes near a municipal solid waste (MSW) dumping facility in Bukoba Town, Kagera Region, United Republic of Tanzania. The objective of the study was to assess surface water pollution caused by a MSW dump. Selected physico-chemical parameters (pH, temperature, Electrical Conductivity [EC], and Total Dissolved Solids [TDS]), nutrient levels, as well as heavy metals concentrations (Pb, Zn, Cu, Cr, Cd) were analyzed in the laboratory at the University of Dar es Salaam, in accordance with standard methods, and were compared with the existing standard limits for freshwater qualities, as stipulated by WHO and US-EPA. Results have shown that pH values were within the allowable range of between 6.5 and 8.5, except for one value (8.82 ± 0.11) that was measured at the midstream. Temperature values were between 26.28 ± 1.02°C and 28.35 ± 0.15°C, which are within the allowable range of between 20°C and 50°C. EC values were between 262.50 ± 8.32 μS/cm and 345.01 ± 6.48 μS/cm, which are below the maximum allowable value of 400 μS/cm. TDS values were between 183.75 ± 6.55 mg/L and 241.51 ± 11.33 mg/L, which are below the maximum allowable value of 500 mg/L. Nitrate levels were between 17.52 ± 1.12 mg/L and 32.00 ± 3.02 mg/L, which are above the standard limit of 10 mg/L above. Concentrations of Lead, Chromium, and Cadmium were between 0.03 ± 0.01 mg/L and 0.16 ± 0.05 mg/L, 0.55 ± 0.02 mg/L and 1.14 ± 0.07 mg/L, and 0.009 ± 0.12 mg/L and 0.098 ± 0.22, respectively, which are all above the recommended limits of 0.01, 0.05, and 0.003 mg/L, respectively. Values for copper and zinc were between 0.02 ± 0.12 mg/L and 0.20 ± 0.22 mg/L, and 0.79 ± 0.32 mg/L and 1.57 ± 0.04 mg/L respectively, which are below the recommended limits of 1.3 and 5 mg/L, respectively. This study has revealed that Bukoba MSW dumping facility has potential impacts on the water quality in River Kanoni, for domestic usage. This, therefore, demands all relevant authorities to immediately find a proper and sustainable replacement for the existing MSW dump in Bukoba town.Item The use of phytoremediation technology for abatement soil and groundwater pollution in Tanzania: opportunities and challenges(Journal of Sustainable Development in Africa, 2008) Mwegoha, William J. S.Contamination of soil and groundwater from anthropogenic sources is a major concern in many developing countries including Tanzania. Improper handling of Municipal Solid Wastes (MSW) in many urban centers in Tanzania has often resulted into gas emissions and generation of leachate, which pose threat to the environment. Additionally, the use of pesticides for agricultural purposes is on the increase because of the need to improve crop production and control of pests, weed infestation and insect outbreaks. As a consequence, pesticide use has caused adverse contamination in soils and waters. The potentially negative impacts of these pesticide stocks on humans and the environment are of major concern. To make the situation more challenging, the country has experienced a substantially fast growth of the mining sector in many parts of the country over the past ten years, which has resulted in reported soil and water pollution from acid mine drainage with elevated concentrations of heavy metals. It is estimated that more than 30% of the Tanzanians depend on groundwater as their source of water. Most of the conventional methods for environmental remediation of these sites are expensive and often poorly implemented or not implemented at all. Thus, there is a clear need to develop new cost effective and environmentally friendly clean-up methods to remediate the contaminated areas in Tanzania. Phytoremediation is a relatively new and promising technology that uses plants to degrade, stabilize, metabolize or sequester potentially toxic compounds from the environment. This paper is aimed at assessing the potential of phytoremediation as a low-cost alternative, but which has yet to be studied and used in Tanzania.