Abstract
In recent times, large waste is produced especially in an urban area due to population with careless handling which calls for worries. Hence, the study determines the effect of Akanran dumpsite on the groundwater quality for drinking and domestic purposes. It employs the geophysical and geochemical methods. Wenner configuration was adopted with constant electrode separation ranging from 5 to 25 m to acquire five profiles within and outside the dumpsite and processed using DIPROWIN 4.01 software. Soil and water samples were collected and analysed. The 2-D pseudosection revealed a very low resistivity value which is less than 10 ohm-meter and is suspected to be leachate infiltration which migrates to a depth of 7 m. The results of soil analysis show that clay ranges between 9.61 - 18.8 %., silt between 9.27 – 19.7 % and an average bulk density of 1.48 (relatively high for a sandy loam) which suggests that infiltration of the leachate is minimal. The pH of the water sample analysis obtained is 6.9, suggesting acidic concentrates in the groundwater of the study area. However, this pH value for drinking water is within the permissible level of 6.5 – 8.5 indicating that the groundwater in the study area is suitable for drinking and also for other purposes. A Nitrate level of 2.56 mg/l in the water sample falls within 50.0 mg/l, and nitrite level of 0.09 mg/l which is moderate when compared to the permissible level limit of 0.20 mg/l. The concentration of heavy metals in hand-dug well sample from Akanran dumpsite are Zn (1.81 mg/l), Cu (0.38 mg/l), Cr (0.003 mg/l) which are within the permissible level limit and Pb (0.21 mg/l) which recorded high metal concentration which may suggest that the dumpsite contain waste metals which may leach down the soil. In conclusion, the groundwater in the area of the survey is safe and there is possible contamination with time.
Highlights
To get rid of waste generated, many dumpsites around the country have been overfilled and causing environmental pollution
The contaminant at profile 2 is limited to the topsoil; a high contaminant is suspected at profile 3, in profile 5, the topsoil has very low resistivity values due to contamination from the plume that seeps out of the waste and saturated it
The pH of the water sample analysis obtained is 6.9, suggesting acidic concentrates in the groundwater of the study area. This pH value fall within the permissible level (20) of 6.5 – 8.5 for potable water shows that the groundwater in the study area is suitable for drinking the control sample value is 6.45
Summary
To get rid of waste generated, many dumpsites around the country have been overfilled and causing environmental pollution. A geophysical investigation involving 2D resistivity survey of soil vegetation cover, the geology of the area, amount of on Aba Eku dump site in Southwestern Nigeria was carried precipitation, types of wastes, and the inflow of groundwater out by Ganiyu et al [12] with a view to map the conductive [1]. Location and the Geologic Settings of the Study Area sociated with the waste dumpsites, e.g. surface water contamination, groundwater contamination, bad smell or odour, release of greenhouse gases, accidental hazard caused by fire, slope instability, loss of vegetation, soil contamination and bird-hit [8]. The impact of solid waste disposal on the groundwater within the vadose and saturated zone of two dumpsites namely AbaEku and Ajakannga in Ibadan Metropolis was investigated by [11] using Vertical Electrical Sounding (VES) to determine the depth and thickness of subsurface layers. Using the Duncan Multiple Range Test (DMRT) at 5 % probability, the Mean of soil samples was differentiated
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