Assessment of leachate contamination potential of landfills in Ibadan, Nigeria

Abstract

Environmental pollution leads to poor health and has been a worrisome experience to humanity for the past few decades. This research was conducted to determine the pollution potential of landfill leachates (LFL) in Sub-Saharan Africa, using Ibadan as case study. Survey of landfills in the metropolis was undertaken; the two major active unlined landfills (Ajakanga and Awotan), were considered for this study. During sampling, eighteen parameters of interest were analyzed. The leachate pollution indices (LPI) of each landfill were calculated. The LPI of Awotan landfill is 17.55 while that of Ajakanga is 15.67. With the exceedances of the 7.378 standard LPI value, all landfills in the metropolis is recommended to be closed down in line with international best practices and new sanitary landfills set up in their stead. Based on the sub-LPI values obtained, biological treatment would be the most viable treatment option for the LFL produced. The findings from this study are applicable in landfill management in other countries within the African sub-region; thereby contributing to the attainment of Sustainable Development Goals (SDGs).

Toxicological Assessment of Clarias gariepinus Exposed to Leachates from Awotan Landfill, Ibadan, Oyo State, Nigeria.

“…While the concentrations of Cd, Cr, and Pb are negligible, the concentrations of other heavy metals including; Cu (9.28mg/L), Fe (604.48mg/L), and Mn (45.64mg/L), were very high and exceeded the SON and USEPA recommended standards. Previous studies such as Balogun et al, [25] and Adesogan and Omonigho [28] have also reported high values of Cu. However, the values reported by these studies were significantly lower than the concentration of Cu recorded in this study.…”

“…For instance, Balogun et al, [27] reported high values of Cd (1.28mg/L), Cr (1.74mg/L) and Pb (3.08mg/L) in leachates samples from the Awotan dumpsite. Similarly, Adesogan and Omonigho [28] reported the presence of Cd (0.833mg/ L), Cr (0.080mg/L), and Pb (0.093mg/L) in leachate samples from the Awotan dumpsite. The absence of these heavy metals in the leachate samples collected in this study could be attributed to the fact that the Awotan dumpsite has been rehabilitated in recent years and equipped with leachate treatment facilities to reduce the concentration of heavy metals in the leachates produced in the dumpsite.…”

Assessment of Contamination Potential in Okhla Landfill, New Delhi by using Leachate Pollution Index

“…The concentration of leachate varies with seasons, so seasonal analysis and assessment of contamination potential by calculating LPI are very necessary for the effective management and treatment of leachate. 13,14 LPI is an environmental indicator for calculating the hazardous capacity of landfill leachates of municipal solid wastes, provides an appropriate means of investigating complex data, and promotes its reports to the people, area specialists, and policymakers developed and reported by Kumar and Alappat. 15 The value of LPI denotes the level of leachate toxicity possibilities of a specific landfill.…”