Temporal change of properties in landfills from the electrochemical viewpoint

Abstract

Temporal changes of the leachate quality have been considered as useful indicators for clarifying the stabilization of landfills. In this study, the sorts of inorganic ions and the temporal changes of the ionic concentrations in the leachate were aimed to estimate the stage of the stabilization. 6 controlled landfill sites and an inert type landfill site were used for the examination. Furthermore, the effectiveness of resistivity monitoring was examined to compensate the insufficiency with the current method for estimating the stabilization.
The main results of this study are:
(1)The main inorganic ions in the leachate are Na⁺, K⁺, Ca₂₊, Cl^-and HCO₃-.
(2)The ionic concentrations in the leachate increase for the beginning period of the filling, and shift to decrease during or after the filling. Namely, most of the soluble components with wastes have been leached by the permeable water. In gen-eral, AL₂O₃, SiO₂ and CaO contents increase comparatively in the wastes after leaching,
(3)The temporal changes of the resistivity of landfills are good indicators for clarifying changes of these conditions.