Nigerian Lateritic Clay Soils As Hydraulic Barriers To Adsorb Metals. Geotechnical Characterization And Chemical Compatibility

Abstract

The suitability of using lateritic clays from Aviele and Igarra has been investigated both in the Northern part of Edo state, Nigeria as liners of an engineered landfill and to adsorb metals in leachates. Geotechnical characteristics, pH, and elemental composition for the lateritic clay samples were determined. The chemical composition, pH, total dissolved solids and electrical conductivity were determined for leachates collected from two dumpsites. The capacities of the lateritic clay soils to adsorb heavy metals in the leachates were determined using the batch equilibrium adsorption technique. The unconfined compressive strength (UCS) of soils were found to be sufficient to resist damage. By both the standard and modified Proctor compaction tests, it was found that the coefficients of permeability for the soil samples were lower than 1×10 -9 m/s that is widely recommended for soils that are to be used as landfill liners. Pb 2+ , Zn 2+ and Cr 2+ were the heavy metals in the leachates. The sorption selectivity order for tested soils depended on the soil type and properties.

Integrated treatment of tailing material for the selective recovery of uranium, rare earth elements and heavy metals

“…Chloride and nitrate ions may induce competition effect for the binding of U(VI) ions onto quaternary ammonium resins at low concentration and may even elute the U(VI) ions from loaded resins (IAEA, 1993). The relatively poor efficiency of leaching process in agitated tank may be attributed to the presence of clays that can contribute to re-adsorb the metals from the leachates during the stationary filtration step (Helfferich, 1995;Juri et al, 2017;Majone et al, 1993;Yong and Phadungchewit, 1993;Zaki et al, 2017). In order to avoid this problem and to increase the leaching efficiency, the next step consisted of testing the leaching process in column reactor.…”

Cement Stabilization Treatment of Lead and Naphthalene Contaminated Lateritic Soils

“…Due to its fixed and non-breakable structure, lead present possible risks because of its bioavailability (Ragnvaldsson, Berglind, Tysklind, & Leffler, 2007). Most soils especially fine-grained soils easily absorb lead onto themselves (Ojuri, Akinwumi, & Oluwatuyi, 2017), this attribute heightens with an increase in the soil's organic content, CEC (cation exchange capacity) and pH (Zhang et al, 2015). On the other hand, polycyclic aromatic hydrocarbons (PAHs) are a group of organic compounds that consist of two or more fused benzene ring structures in various arrangements (Environment Agency, 2003).…”

Investigation of groundwater vulnerability to open dumpsites and its potential risk using electrical resistivity and water analysis

“…The laterites are usually consolidated, especially at the topsoil and weathered into lateritic nodules mixed with sandy and silty clays [ 30 ]. Laterite soils are widespread in African nations including Nigeria, which is sometimes served as landfill liners [ 3 ]. The average overburden and weathered layer thickness of Kaduna Millennium City are usually encountered at about 28 m and 20 m respectively [ 31 ].…”

“…The open dumpsite is an unfavourable global phenomenon which had mastered the act of polluting the groundwater system. While [ 1 ] described open dumpsites as non-engineered landfill sites [ 2 ], identified open dumpsites as a necessary evil, and [ 3 ] labelled dumpsites as unfriendly environmental phenomena, which often contaminate the groundwater [ 1 ], and placed it on a pedestal of water insecurity due to the dumpsite leachate percolation into groundwater. Most developing countries are now struggling with the challenge of managing a large number of solid wastes and their environmental impacts [ 3 – 5 ].…”

“…While [ 1 ] described open dumpsites as non-engineered landfill sites [ 2 ], identified open dumpsites as a necessary evil, and [ 3 ] labelled dumpsites as unfriendly environmental phenomena, which often contaminate the groundwater [ 1 ], and placed it on a pedestal of water insecurity due to the dumpsite leachate percolation into groundwater. Most developing countries are now struggling with the challenge of managing a large number of solid wastes and their environmental impacts [ 3 – 5 ]. The United Nations Environment Programme (UNEP) and the International Solid Waste Association (ISWA) argued that the rate of municipal solid waste (MSW) generation is fast becoming consistent in developed countries.…”