This paper presents the ashes characterization generated from different incineration processes such as: a) coupled kilns b) conventional kiln and c) wood, in order to set which is best for the biogas purification from landfill. The techniques employed were scanning electronic microscopy (SEM), and X-ray diffraction (DRX). This was evaluated through its micro-structural properties as carbon dioxide reduction efficiency through chemical reaction with calcium oxide found in the ashes. Calcium carbonate mineral was got as highly stable and insoluble salt. The results indicate the ash from wood is the most appropriate to reduce the carbon dioxide due to its high calcium content.
