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Article Abstract
This study investigates the physicochemical and microbiological properties of oily sludge from the Skikda petrochemical refinery, Algeria, to assess ecological risks and bioremediation potential. Sludge samples at different aging stages (6 months, 3 months, and fresh) were analyzed using GC-MS, FTIR, SEM-EDX, and 16S rRNA metabarcoding. Results reveal high organic matter (53-63 %), petroleum hydrocarbons (14,700-21,440 mg kg), and heavy metals (e.g., Cd, As, Cr), with toxicity increasing with sludge age. The Ecological Risk Index (ERI <40) indicates low ecological risk, though metal accumulation rises over time. Microbial analysis identified diverse communities, dominated by Proteobacteria, Firmicutes, and Bacteroidota, with hydrocarbon-degrading bacteria (Pseudomonas, Klebsiella) suggesting strong bioremediation potential. These findings provide critical insights into sludge composition and microbial dynamics, offering a foundation for cost-effective, sustainable bioremediation strategies tailored to Algerian refineries and applicable globally.
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| http://dx.doi.org/10.1016/j.chemosphere.2025.144578 | DOI Listing |
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