The Effect of Leachate on the Compacted and Consolidated Clay Soils

Year 2017, Volume: 1 Issue: 1, 36 - 47, 01.08.2017

Sevgi Güneş Durak , Mehmet Şükrü Özçoban Esra Billur Balcıoğlu Öykü Mutlu Salmanlı Güler Demirkol Neşe Tüfekci

Abstract

Solid waste landfills
constitute a potential major threat to
groundwater quality. Water present in the waste,
rainwater infiltration during and/or after the landfilling process and
groundwater penetration can result in the generation of leachate. Leachate is a
kind of waste liquid consisting of waste contaminants. Clay soils are natural
matters to minimize the permeability of natural soil liners in landfill areas. Some
contaminants in the leachate can alter compacted clay soils and cause
increasing or decreasing permeability.

This study investigates effects of leachate on the permeability of the compacted and consolidated
clay soils, thereby evaluating the effectiveness
of these clay soils as liners in preventing groundwater contamination. To
determine removal capability of compacted and consolidated clay soils, some
metal ions (Fe(II), Mn(II)) are also measured in influent and effluent of the
lab-scale reactor.

According to
results of this study, Fe(II) and Mn(II) removal efficiency increases with
time. Fe(OH)₃ and MnO₂ precipitations on the clay soil
particles increase oxidation rate depending on the autocatalytic effect. Also, in the beginning,
some decrease has been observed in the compacted and consolidated clay soils
permeability associated with the contamination. However, as time goes by, these
results show that leachates may cause an increase
in the permeability.

Keywords

Clay soil, leachate, metal ions, permeability

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