Assessment of heavy metals (Pb, Cu, Cr, Cd and Fe) in the groundwater wells in the vicinity of Nyanza Municipal Solid waste in Kigali City- Rwanda

Abstract

The purpose of this study was to assess the impacts of Nyanza Municipal Solid Waste (MSW) dumping site on groundwater. As many groundwater resources are contaminated by dumping sites that are poorly managed, the equally poorly managed Nyanza MSW dumping site in Kigali could have impact on people depending on groundwater for their daily activities. Leachate samples were taken at the edge of the waste bulk and groundwater samples were collected from the wells located in the vicinity of the dumping site. Sampling was done in dry and wet season using PE bottles. Heavy metals analysis was done using flame atomic absorption method.

Groundwater Quality Assessment of Chilanchil Abay Watershed: The Case of Bahir-Dar City Waste Disposal Site

“…This could be due to water evaporates during the dry season and concentration of ions increases hence electrical conductivity increases (the increase in electrical conductivity was due to evaporation of water in under groundwater channels which increased the concentrations of dissolved salts or conducting substances in the borehole water systems). The findings of high-value E.C in a dry season during the study period was similar with the study of (Nsengimana et al, 2012) who have done the assessment of heavy metals in the groundwater wells in the vicinity of Nyanza municipal Solid waste in Kigali City-Rwanda and found out the higher value of E.C during the dry season. From the data of dry season, the maximum values were obtained at SS 5 , SS 6 andSS 4 respectively with a minimum value at SS 3 while in a wet season maximum values were recorded orderly at SS 6 , SS 3 andSS 5 with a minimum value at SS 2 (Figure 3, Table 1).…”

Seasonal assessment of drinking water sources in Rwanda using GIS, contamination degree (Cd), and metal index (MI)

“…The total area of Rwanda is 26,338 square kirometers, including about 128,190 ha of lakes, 7260 ha of rivers, and 77,000 ha are occupied by marshlands. In addition, there are about 22,300 springs (Ali et al 2014; Nsengimana et al 2012). To ensure that water undergoes prior treatment and to increase access to safe drinking water, about sixteen water treatment plants are operating countrywide.…”

“…There are also poor sewage systems and common use of public latrines and septic tanks in both rural and urban areas (Aboniyo et al 2017). Although several scholars (Doyle and Shanahan 2010; Karamage et al 2016; Nsengimana et al 2012; Nhapi et al 2011) have conducted water quality assessments, they lacked the seasonal measurements necessary for understanding temporal changes in water quality, so that appropriate seasonal drinking water source management mechanisms can be applied. Regular water quality assessment would help water resource managers, environmental health officers, and the whole community to better understand and correlate seasonal variability and drinking water quality.…”