Abstract
The biotransformation during storage of petroleum refinery sludge was evaluated by physicochemical and spectroscopy analyses. The abatement rate of organic matter has reached 50.5% after 14 months of storage. The humic substances have decreased of about 49% at the end of storage indicating that the OM was mineralized into inorganic compounds (CO 2 , N 2 …). The XRD of dried samples shows the presence of a large proportion of silica (SiO 2 ), carbonate (CaCO 3 ), Hercynite (Al 2 FeO 4 ) and hemihydrate calcium sulphate (2CaSO 4 .H 2 O). Hematite (Fe 2 O 3 ) and anhydrite (CaSO 4 ) were found as a new appeared phase. Pb, Cd, Cr, Cu, Ni and Zn were the most identified heavy metals in the petroleum samples. Their increase at the end of storage was explain by the organic matter degradation. FTIR analysis show that the carbonate, sulphate and silica are the most identified compounds beside the organic matter.
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