ESTONIAN ACADEMY
PUBLISHERS
eesti teaduste
akadeemia kirjastus
PUBLISHED
SINCE 1984
 
Oil Shale cover
Oil Shale
ISSN 1736-7492 (Electronic)
ISSN 0208-189X (Print)
Impact Factor (2021): 1.442
THE STUDY OF HYDRATION AND CARBONATION REACTIONS AND CORRESPONDING CHANGES IN THE PHYSICAL PROPERTIES OF CO-DEPOSITED OIL SHALE ASH AND SEMICOKE WASTES IN A SMALL-SCALE FIELD EXPERIMENT; pp. 279–294
PDF | doi: 10.3176/oil.2012.3.07

Authors
ANNETTE SEDMAN, PEETER TALVISTE, KALLE KIRSIMÄE
Abstract

Oil shale ash and semicoke, solid residues from the oil shale industry, are today disposed of separately in landfills which pose a con­sider­able environmental hazard. In the current study, the possibility of co-depositing ash and semicoke was investigated in a small-scale field experi­ment. The purpose of the experiment was to elucidate which mineral changes in the landfilled material occurred and how these changes affected its perme­ability characteristics. For this purpose five mixtures with different ash-to-semicoke ratios were prepared and placed in the open air. Changes in the dry density, hydraulic conductivity and mineral composition of mixtures were recorded within a period of four months and after one year. During the experi­ment the mixtures expanded and showed increased permeability due to intensive secondary mineralization. The higher the ash content of a mixture, the more intensive the expansion and, consequently, the higher the perme­ability, which contributed to an increased infiltration of the leachate and toxic compounds through the landfilled material, thus leading to unfavour­able environmental impacts. The above suggests the possibility of co-deposit­ing ash and semicoke, but only if the ash content of their mixture is low enough.

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