Management of the ever-increasing generated solid waste had been a difficulty for state governments in Nigeria. The high costs connected to this waste management which had encumbered the state budget, ignorance or lack of understanding of resourceful waste management and insensitivity to environmental concerns may have led to partial neglect of this sector. This research paper is aimed at evaluating the rehabilitation potential and the risk level of Igbatoro dumpsite, an Ondo state-managed waste dumpsite which predominantly receives the waste of Akure and its environs. In determining rehabilitation/reconstruction potentials and assessing the risk of the dumpsite, an Integrated Risk Based Approach (IRBA) was considered. The Risk Index (RI) was calculated from the addition of the sensitivity index output with the attribute weightage of the twenty-seven (27) parameters studied. A total risk index of 571.58 was obtained for Igbatoro dumpsite indicating moderate hazard evaluation. Questionnaires distributed to dwellers around the dumpsite also showed that 83.6% of those interviewed agreed that the present management of the dumpsite is poor while 81.8% supported rehabilitation of the dumpsite. Hence, reconstruction of the Igbatoro dumpsite to an endurable and controlled landfill is hereby recommended.

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The research investigated the effects of palm kernel shell ash (PKSA) on lime-stabilized lateritic soil. Preliminary tests were performed on three soil samples, i.e., L1, L2 and L3 for identification; the results showed that L1

Waste effluents from abattoirs have been documented to have harmful effects on the soil media. There is little information about the level of contamination by abattoir effluents on the soil media in Omu-Aran. This study therefore assessed soil samples for possible contamination of physicochemical parameters and heavy metals from different points and some meters away from the mini abattoir in Omu-Aran, Kwara State, Nigeria. Soil samples which are 18 in number were collected from the soil around wells which are owned by individuals and a well designated as Control situated at distances which vary and different elevations to the abattoir. The physicochemical parameters of the soil samples were obtained by applying the standard methods. The analysis of data was achieved using descriptive statistics and ANOVA. The mean values of parameters in the soil samples collected around the studied wells ranged from 31.00±2.00–110.03±8.72 mg/L and 7.21±0.02–7.83±0.02 for electrical conductivity and pH respectively. Chloride, nitrate and phosphate had values of 6.37±0.13–9.13±0.21 mg/L, 3.67±0.07–4.50±0.31 mg/L and 3.86±0.07–5.41±0.30 mg/L respectively. However, average values for heavy metals (Ni, Cr and Pb) though slightly higher than the control site, were above permissible limits. Activities within Omu-Aran Abattoir impacts negatively on the surrounding arable soils; therefore, pollution control procedures which are sustainable should be implemented for abattoirs situated in residential areas.