Abstract
Acid tar (AT) is a distinct black viscous waste from the petrochemical industry that retains hazardous characteristics decades after creation. It is defined as an emulsion of various organic compounds, sulfuric acid, and water. Due to specific chemical composition and physical properties, the best available technique for the treatment of AT is not determined. This paper investigates the treatment of AT by CaO, resulting in its complete physicochemical transformation into a dry powder with the characteristics of inorganic material. Waste characterization of AT and obtained powder (including metals, PAH, BTEX, total hydrocarbon content, and EN12457-4 leaching test), their comparative FT-IR and SEM–EDS analyses, and XRD analysis of the powder revealed that the transformation is a complex process involving Ca(OH)2 formation, evaporation of water and BTEX, and degradation of aromatic and unsaturated hydrocarbons. The remained organic phase is encapsulated under Ca(OH)2 and CaCO3 layers forming “organic core—inorganic shell” micron-sized particles, rendering the powder suitable for further treatment. This was confirmed by solidification/stabilization treatment of AT and obtained powder using the same amount of cement and pozzolanic binder. In contrast to AT solidificates, the powder solidificates possess unconfined compressive strength above the required value and characteristics of inert waste.
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Acknowledgements
This work has been financially supported by grants issued from the Ministry of Science, Technological Development and Innovation of the Republic of Serbia (Contract No. 451-03-47/2023-01/200287 and 451-03-47/2023-01/200135).
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Ministarstvo Prosvete,Nauke i Tehnološkog Razvoja,451-03-47/2023-01/200287
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Dragana Radovanović: Conceptualization, Methodology, Investigation, Writing- Original draft preparation. Marija Štulović: Data curation, Investigation. Milisav Ranitović: Writing- Reviewing and Editing. Jovana Djokić: Visualization, Writing- Reviewing and Editing. Zoran Andjić: Validation. Željko Kamberović: Supervision.
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Radovanović, D., Štulović, M., Ranitović, M. et al. Acid tar treatment—the transformation of organic waste into “organic core—inorganic shell” structure particles. J Mater Cycles Waste Manag (2024). https://doi.org/10.1007/s10163-024-02012-7
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DOI: https://doi.org/10.1007/s10163-024-02012-7