Possible effects and reactions between leachate and different clay material types
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Possible effects and reactions between leachate and different clay material types I. A. Oyediran1 · D. A. Olalusi1 · M. T. Jimoh2 Received: 18 April 2020 / Accepted: 14 July 2020 © Springer Nature Switzerland AG 2020
Abstract Interactions between landfill leachate and some clayey soils were investigated to elucidate their possible effects and reactions and the extent to which the chemical composition of landfill leachate influences the chemical and mineralogical properties of the soils upon leachate contact. Physicochemical properties of landfill leachate was obtained while the clay mineralogy, major and minor oxides composition, pH, cation exchange capacity (CEC), carbonate content and total organic carbon of Shale (Sedimentary), Migmatite gneiss and Quartzite (Basement Complex)-derived clayey soils after three-weeks saturation with leachate were determined. Dark brown colour and malodorous smell of landfill leachate is linked to high concentration of dissolved organic substances in the leachate composition while high leachate pH indicates an old and stabilized leachate with its temperature impacting the bacterial growth and chemical reaction. Significant changes were observed in both chemistry and mineralogy of the clays after leachate contact with observed appearance of Illite in the migmatite gneiss-derived clayey soil, an indication of mineralogical changes caused by ionic solutions. Enrichment of Ca, SiO2 and Cl; in addition to increased CEC for all the soils is generally noticed. Furthermore, leachate contact resulted in modification of Basement Complex-derived soils from acidic to alkaline soils while the sedimentary terrain-derived soils retained its alkaline pH nature. Hence, alteration in mineralogical and chemical properties observed in the different derived clayey soils is a function of the leachate composition, sorptive capacity of the soils, parent material and especially the inherent reactions upon leachate contact. Keywords Reactions · Landfill leachate · Alteration · Significant changes
Introduction Landfill leachate formed from urban solid waste is commonly contaminated and contains multifaceted wastewater [1, 2]. The generation of leachate is as a result of percolation of precipitation via open landfill coupled by means of any disposed liquid wastes, which results in the withdrawal of water soluble compounds and particulate material of the wastes [3]. The distinctiveness of leachate are greatly unpredictable depending on the waste composition, amount of precipitation, site hydrology, waste compaction, cover design, * I. A. Oyediran [email protected]; [email protected] 1
Department of Geology, Faculty of Science, University of Ibadan, Ibadan, Nigeria
Department of Earth Science, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
2
sampling procedures and leachate—soil interaction, others are landfill design and operation [4, 5]. Clay soils have over the years become the preferred barrier and liner material commonly used in engin
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